Update libpngquant to v2.12.5.

This commit is contained in:
root670 2020-05-17 09:53:02 -07:00
parent ad2a19897f
commit 5151385681
38 changed files with 4319 additions and 1498 deletions

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config.mk
imagequant.pc
*.lo
*.o
*.a
*.so.0
*.so
*.bz2
*.dylib
*.dylib.0
*.jnilib
*.dSYM
org/pngquant/*.class
org/pngquant/*.h
target/
msvc-dist/org/
msvc-dist/*.md
msvc-dist/Makefile*
msvc-dist/*.cs
msvc-dist/*.xml
msvc-dist/CHANGELOG
msvc-dist/COPYRIGHT
msvc-dist/configure
msvc-dist/.gitignore
quantized_example.png
example
lodepng.?

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matrix:
include:
- os: linux
language: java
jdk: oraclejdk9
env: CFLAGS="-fPIC"
install: true
script: make java
- os: linux
language: rust
script: cargo build --verbose --all && cargo test --verbose --all
- os: linux
language: generic
script: make static
- os: linux
language: generic
script: ./configure --prefix=/tmp && make libimagequant.so && make install

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version 2.12
------------
- new liq_histogram_add_fixed_color()
- faster for large/complex images
- workarounds for Microsoft's outdated C compiler
version 2.11
------------
- new liq_image_set_background() for high-quality remapping of GIF frames
- new liq_image_set_importance_map() for controlling which parts of the image get more palette colors
- improved OpenMP support
version 2.10
-----------
- supports building with Rust/Cargo
version 2.9
-----------
- new liq_histogram_add_colors()
version 2.8
-----------
- standalone version
- added Java interface (JNI)
- new API for remapping multiple images to a single shared palette
version 2.7
-----------
- improved dithering of saturated and semitransparent colors
- libimagequant reports detailed progress and supports aborting of operations via callbacks
- fixed order of log output when using openmp
version 2.5
-----------
- replaced color search algorithm with vantage point tree, which is much faster and more reliable
- deprecated IE6 workaround
- warn when compiled without color profile support
- improved support for predefined colors in libimagequant
version 2.4
-----------
- fixed remapping of bright colors when dithering
- added libimagequant API to add fixed preset colors to the palette
version 2.3
-----------
- added ./configure script for better support of Intel C compiler and dependencies [thanks to pdknsk]
- tweaked quality metric to better estimate quality of images with large solid backgrounds [thanks to Rolf Timmermans]
- avoid applying quality setting to images that use palette already
version 2.2
-----------
- OpenMP acceleration
- improved support for Intel C Compiler, speedup in 32-bit GCC, and some workarounds for Visual Studio's incomplete C support
version 2.1
-----------
- option to generate posterized output (for use with 16-bit textures)
version 2.0
-----------
- refactored codebase into pngquant and standalone libimagequant
- reduced memory usage by further 30% (and more for very large images)
- less precise remapping improving speed by 25% in higher speed settings
- fixed regression in dithering of alpha channel

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# Contributor Covenant Code of Conduct
## Our Pledge
In the interest of fostering an open and welcoming environment, we as
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Thank you for contributing! pngquant and libimagequant are licensed under multiple
licenses, so to make things clear, I'm accepting contributions as licensed under
the BSD 2-clause license:
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© 1997-2002 by Greg Roelofs; based on an idea by Stefan Schneider.
© 2009-2014 by Kornel Lesiński.
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libimagequant is derived from code by Jef Poskanzer and Greg Roelofs
licensed under pngquant's original license (at the end of this file),
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39
pngquant/Cargo.toml Normal file
View File

@ -0,0 +1,39 @@
# libimagequant is a pure C library.
# Rust/Cargo is entirely optional. You can also use ./configure && make
[package]
version = "2.12.5"
authors = ["Kornel Lesiński <kornel@pngquant.org>"]
build = "rust/build.rs"
categories = ["external-ffi-bindings"]
homepage = "https://pngquant.org/lib"
include = ["COPYRIGHT", "rust/*", "*.c", "*.h", "README.md", "Cargo.toml"]
keywords = ["pngquant"]
license = "GPL-3.0+"
links = "imagequant"
name = "imagequant-sys"
readme = "README.md"
repository = "https://github.com/ImageOptim/libimagequant"
description = "Statically linked C part of imagequant library powering tools such as pngquant.\n\nThis library is dual-licensed like pngquant: either GPL or a commercial license. See website for details: https://pngquant.org"
edition = "2018"
[build-dependencies]
cc = "1.0.38"
[dependencies]
rgb = "0.8.13"
[dependencies.openmp-sys]
optional = true
version = "0.1.5"
[features]
default = ["sse"]
openmp = ["openmp-sys"]
openmp-static = ["openmp", "openmp-sys/static"]
sse = []
[lib]
crate-type = ["cdylib", "staticlib", "lib"]
name = "imagequant_sys"
path = "rust/libimagequant.rs"
doctest = false

View File

@ -1,472 +0,0 @@
# libimagequant—Image Quantization Library
Small, portable C library for high-quality conversion of RGBA images to 8-bit indexed-color (palette) images.
It's powering [pngquant2](http://pngquant.org).
## License
[BSD](https://raw.github.com/pornel/improved-pngquant/master/lib/COPYRIGHT).
It can be linked with both free and closed-source software.
## Download
The [library](http://pngquant.org/lib) is currently a part of the [pngquant2 project](https://github.com/pornel/improved-pngquant/tree/lib/lib).
Files needed for the library are only in the `lib/` directory inside the repository (and you can ignore the rest).
## Compiling and Linking
The library can be linked with ANSI C and C++ programs. It has no external dependencies.
To build on Unix-like systems run:
make -C lib
it will create `lib/libimagequant.a` which you can link with your program.
gcc yourprogram.c /path/to/lib/libimagequant.a
On BSD, use `gmake` (GNU make) rather than the native `make`.
Alternatively you can compile the library with your program simply by including all `.c` files (and define `NDEBUG` to get a fast version):
gcc -std=c99 -O3 -DNDEBUG lib/*.c yourprogram.c
### Compiling on Windows/Visual Studio
The library can be compiled with any C compiler that has at least basic support for C99 (GCC, clang, ICC, C++ Builder, even Tiny C Compiler), but Visual Studio 2012 and older are not up to date with the 1999 C standard. There are 2 options for using `libimagequant` on Windows:
* Use Visual Studio **2013** (MSVC 18) and an [MSVC-compatible branch of the library](https://github.com/pornel/pngquant/tree/msvc/lib)
* Or use GCC from [MinGW](http://www.mingw.org). Use GCC to build `libimagequant.a` (using the instructions above for Unix) and add it along with `libgcc.a` (shipped with the MinGW compiler) to your VC project.
## Overview
The basic flow is:
1. Create attributes object and configure the library.
2. Create image object from RGBA bitmap or data source.
3. Perform quantization (generate palette).
4. Store remapped image and final palette.
5. Free memory.
<p>
#include "lib/libimagequant.h"
liq_attr *attr = liq_attr_create();
liq_image *image = liq_image_create_rgba(attr, bitmap, width, height, 0);
liq_result *res = liq_quantize_image(attr, image);
liq_write_remapped_image(res, image, bitmap, bitmap_size);
const liq_palette *pal = liq_get_palette(res);
// use image and palette here
liq_attr_destroy(attr);
liq_image_destroy(image);
liq_result_destroy(res);
Functions returning `liq_error` return `LIQ_OK` (`0`) on success and non-zero on error.
It's safe to pass `NULL` to any function accepting `liq_attr`, `liq_image`, `liq_result` (in that case the error code `LIQ_INVALID_POINTER` will be returned). These objects can be reused multiple times.
There are 3 ways to create image object for quantization:
* `liq_image_create_rgba()` for simple, contiguous RGBA bitmaps (width×height×4 bytes large array).
* `liq_image_create_rgba_rows()` for non-contiguous RGBA bitmaps (that have padding between rows or reverse order, e.g. BMP).
* `liq_image_create_custom()` for RGB, ABGR, YUV and all other formats that can be converted on-the-fly to RGBA (you have to supply the conversion function).
## Functions
----
liq_attr* liq_attr_create(void);
Returns object that will hold initial settings (attributes) for the library. The object should be freed using `liq_attr_destroy()` after it's no longer needed.
Returns `NULL` in the unlikely case that the library cannot run on the current machine (e.g. the library has been compiled for SSE-capable x86 CPU and run on VIA C3 CPU).
----
liq_error liq_set_max_colors(liq_attr* attr, int colors);
Specifies maximum number of colors to use. The default is 256. Instead of setting a fixed limit it's better to use `liq_set_quality()`.
Returns `LIQ_VALUE_OUT_OF_RANGE` if number of colors is outside the range 2-256.
----
int liq_get_max_colors(liq_attr* attr);
Returns the value set by `liq_set_max_colors()`.
----
liq_error liq_set_quality(liq_attr* attr, int minimum, int maximum);
Quality is in range `0` (worst) to `100` (best) and values are analoguous to JPEG quality (i.e. `80` is usually good enough).
Quantization will attempt to use the lowest number of colors needed to achieve `maximum` quality. `maximum` value of `100` is the default and means conversion as good as possible.
If it's not possible to convert the image with at least `minimum` quality (i.e. 256 colors is not enough to meet the minimum quality), then `liq_quantize_image()` will fail. The default minumum is `0` (proceeds regardless of quality).
Quality measures how well the generated palette fits image given to `liq_quantize_image()`. If a different image is remapped with `liq_write_remapped_image()` then actual quality may be different.
Regardless of the quality settings the number of colors won't exceed the maximum (see `liq_set_max_colors()`).
Returns `LIQ_VALUE_OUT_OF_RANGE` if target is lower than minimum or any of them is outside the 0-100 range.
Returns `LIQ_INVALID_POINTER` if `attr` appears to be invalid.
liq_attr *attr = liq_attr_create();
liq_set_quality(attr, 50, 80); // use quality 80 if possible. Give up if quality drops below 50.
----
int liq_get_min_quality(liq_attr* attr);
Returns the lower bound set by `liq_set_quality()`.
----
int liq_get_max_quality(liq_attr* attr);
Returns the upper bound set by `liq_set_quality()`.
----
liq_image *liq_image_create_rgba(liq_attr *attr, void* bitmap, int width, int height, double gamma);
Creates image object that represents a bitmap later used for quantization and remapping. The bitmap must be contiguous run of RGBA pixels (alpha is the last component, 0 = transparent, 255 = opaque).
The bitmap must not be modified or freed until this object is freed with `liq_image_destroy()`. See also `liq_image_set_memory_ownership()`.
`width` and `height` are dimensions in pixels. An image 10x10 pixel large will need 400-byte bitmap.
`gamma` can be `0` for images with the typical 1/2.2 [gamma](http://en.wikipedia.org/wiki/Gamma_correction).
Otherwise `gamma` must be > 0 and < 1, e.g. `0.45455` (1/2.2) or `0.55555` (1/1.8). Generated palette will use the same gamma unless `liq_set_output_gamma()` is used. If `liq_set_output_gamma` is not used, then it only affects whether brighter or darker areas of the image will get more palette colors allocated.
Returns `NULL` on failure, e.g. if `bitmap` is `NULL` or `width`/`height` is <= 0.
----
liq_image *liq_image_create_rgba_rows(liq_attr *attr, void* rows[], int width, int height, double gamma);
Same as `liq_image_create_rgba()`, but takes array of pointers to rows in the bitmap. This allows defining bitmaps with reversed rows (like in BMP), "stride" different than width or using only fragment of a larger bitmap, etc.
`rows` array must have at least `height` elements and each row must be at least `width` RGBA pixels wide.
unsigned char *bitmap = …;
void *rows = malloc(height * sizeof(void*));
int bytes_per_row = width * 4 + padding; // stride
for(int i=0; i < height; i++) {
rows[i] = bitmap + i * bytes_per_row;
}
liq_image *img = liq_image_create_rgba_rows(attr, rows, width, height, 0);
// …
liq_image_destroy(img);
free(rows);
The row pointers and bitmap must not be modified or freed until this object is freed with `liq_image_destroy()` (you can change that with `liq_image_set_memory_ownership()`).
See also `liq_image_create_rgba()` and `liq_image_create_custom()`.
----
liq_result *liq_quantize_image(liq_attr *attr, liq_image *input_image);
Performs quantization (palette generation) based on settings in `attr` and pixels of the image.
Returns `NULL` if quantization fails, e.g. due to limit set in `liq_set_quality()`.
See `liq_write_remapped_image()`.
----
liq_error liq_set_dithering_level(liq_result *res, float dither_level);
Enables/disables dithering in `liq_write_remapped_image()`. Dithering level must be between `0` and `1` (inclusive). Dithering level `0` enables fast non-dithered remapping. Otherwise a variation of Floyd-Steinberg error diffusion is used.
Precision of the dithering algorithm depends on the speed setting, see `liq_set_speed()`.
Returns `LIQ_VALUE_OUT_OF_RANGE` if the dithering level is outside the 0-1 range.
----
liq_error liq_write_remapped_image(liq_result *result, liq_image *input_image, void *buffer, size_t buffer_size);
Remaps the image to palette and writes its pixels to the given buffer, 1 pixel per byte. Buffer must be large enough to fit the entire image, i.e. width×height bytes large. For safety, pass size of the buffer as `buffer_size`.
For best performance call `liq_get_palette()` *after* this function, as palette is improved during remapping.
Returns `LIQ_BUFFER_TOO_SMALL` if given size of the buffer is not enough to fit the entire image.
int buffer_size = width*height;
char *buffer = malloc(buffer_size);
if (LIQ_OK == liq_write_remapped_image(result, input_image, buffer, buffer_size)) {
liq_palette *pal = liq_get_palette(result);
// save image
}
See `liq_get_palette()` and `liq_write_remapped_image_rows()`.
----
const liq_palette *liq_get_palette(liq_result *result);
Returns pointer to palette optimized for image that has been quantized or remapped (final refinements are applied to the palette during remapping).
It's valid to call this method before remapping, if you don't plan to remap any images or want to use same palette for multiple images.
`liq_palette->count` contains number of colors (up to 256), `liq_palette->entries[n]` contains RGBA value for nth palette color.
The palette is **temporary and read-only**. You must copy the palette elsewhere *before* calling `liq_result_destroy()`.
Returns `NULL` on error.
----
void liq_attr_destroy(liq_attr *);
void liq_image_destroy(liq_image *);
void liq_result_destroy(liq_result *);
Releases memory owned by the given object. Object must not be used any more after it has been freed.
Freeing `liq_result` also frees any `liq_palette` obtained from it.
## Advanced Functions
----
liq_error liq_set_speed(liq_attr* attr, int speed);
Higher speed levels disable expensive algorithms and reduce quantization precision. The default speed is `3`. Speed `1` gives marginally better quality at significant CPU cost. Speed `10` has usually 5% lower quality, but is 8 times faster than the default.
High speeds combined with `liq_set_quality()` will use more colors than necessary and will be less likely to meet minimum required quality.
<table><caption>Features dependent on speed</caption>
<tr><th>Noise-sensitive dithering</th><td>speed 1 to 5</td></tr>
<tr><th>Forced posterization</th><td>8-10 or if image has more than million colors</td></tr>
<tr><th>Quantization error known</th><td>1-7 or if minimum quality is set</td></tr>
<tr><th>Additional quantization techniques</th><td>1-6</td></tr>
</table>
Returns `LIQ_VALUE_OUT_OF_RANGE` if the speed is outside the 1-10 range.
----
int liq_get_speed(liq_attr* attr);
Returns the value set by `liq_set_speed()`.
----
liq_error liq_set_min_opacity(liq_attr* attr, int min);
Alpha values higher than this will be rounded to opaque. This is a workaround for Internet Explorer 6 that truncates semitransparent values to completely transparent. The default is `255` (no change). 238 is a suggested value.
Returns `LIQ_VALUE_OUT_OF_RANGE` if the value is outside the 0-255 range.
----
int liq_get_min_opacity(liq_attr* attr);
Returns the value set by `liq_set_min_opacity()`.
----
liq_set_min_posterization(liq_attr* attr, int bits);
Ignores given number of least significant bits in all channels, posterizing image to `2^bits` levels. `0` gives full quality. Use `2` for VGA or 16-bit RGB565 displays, `4` if image is going to be output on a RGB444/RGBA4444 display (e.g. low-quality textures on Android).
Returns `LIQ_VALUE_OUT_OF_RANGE` if the value is outside the 0-4 range.
----
int liq_get_min_posterization(liq_attr* attr);
Returns the value set by `liq_set_min_posterization()`.
----
liq_set_last_index_transparent(liq_attr* attr, int is_last);
`0` (default) makes alpha colors sorted before opaque colors. Non-`0` mixes colors together except completely transparent color, which is moved to the end of the palette. This is a workaround for programs that blindly assume the last palette entry is transparent.
----
liq_image *liq_image_create_custom(liq_attr *attr, liq_image_get_rgba_row_callback *row_callback, void *user_info, int width, int height, double gamma);
<p>
void image_get_rgba_row_callback(liq_color row_out[], int row_index, int width, void *user_info) {
for(int column_index=0; column_index < width; column_index++) {
row_out[column_index] = /* generate pixel at (row_index, column_index) */;
}
}
Creates image object that will use callback to read image data. This allows on-the-fly conversion of images that are not in the RGBA color space.
`user_info` value will be passed to the callback. It may be useful for storing pointer to program's internal representation of the image.
The callback must read/generate `row_index`-th row and write its RGBA pixels to the `row_out` array. Row `width` is given for convenience and will always equal to image width.
The callback will be called multiple times for each row. Quantization and remapping require at least two full passes over image data, so caching of callback's work makes no sense — in such case it's better to convert entire image and use `liq_image_create_rgba()` instead.
To use RGB image:
void rgb_to_rgba_callback(liq_color row_out[], int row_index, int width, void *user_info) {
unsigned char *rgb_row = ((unsigned char *)user_info) + 3*width*row_index;
for(int i=0; i < width; i++) {
row_out[i].r = rgb_row[i*3];
row_out[i].g = rgb_row[i*3+1];
row_out[i].b = rgb_row[i*3+2];
row_out[i].a = 255;
}
}
liq_image *img = liq_image_create_custom(attr, rgb_to_rgba_callback, rgb_bitmap, width, height, 0);
The library doesn't support RGB bitmaps "natively", because supporting only single format allows compiler to inline more code, 4-byte pixel alignment is faster, and SSE instructions operate on 4 values at once, so alpha support is almost free.
----
liq_error liq_image_set_memory_ownership(liq_image *image, int ownership_flags);
Passes ownership of bitmap and/or rows memory to the `liq_image` object, so you don't have to free it yourself. Memory owned by the object will be freed at its discretion with `free` function specified in `liq_attr_create_with_allocator()` (by default it's stdlib's `free()`).
* `LIQ_OWN_PIXELS` makes bitmap owned by the object. The bitmap will be freed automatically at any point when it's no longer needed. If you set this flag you must **not** free the bitmap yourself. If the image has been created with `liq_image_create_rgba_rows()` then the bitmap address is assumed to be the lowest address of any row.
* `LIQ_OWN_ROWS` makes array of row pointers (but not bitmap pointed by these rows) owned by the object. Rows will be freed when object is deallocated. If you set this flag you must **not** free the rows array yourself. This flag is valid only if the object has been created with `liq_image_create_rgba_rows()`.
These flags can be combined with binary *or*, i.e. `LIQ_OWN_PIXELS | LIQ_OWN_ROWS`.
This function must not be used if the image has been created with `liq_image_create_custom()`.
Returns `LIQ_VALUE_OUT_OF_RANGE` if invalid flags are specified or image is not backed by a bitmap.
----
liq_error liq_write_remapped_image_rows(liq_result *result, liq_image *input_image, unsigned char **row_pointers);
Similar to `liq_write_remapped_image()`. Writes remapped image, at 1 byte per pixel, to each row pointed by `row_pointers` array. The array must have at least as many elements as height of the image, and each row must have at least as many bytes as width of the image. Rows must not overlap.
For best performance call `liq_get_palette()` *after* this function, as remapping may change the palette.
Returns `LIQ_INVALID_POINTER` if `result` or `input_image` is `NULL`.
----
double liq_get_quantization_error(liq_result *result);
Returns mean square error of quantization (square of difference between pixel values in the original image and remapped image). Alpha channel and gamma correction are taken into account, so the result isn't exactly the mean square error of all channels.
For most images MSE 1-5 is excellent. 7-10 is OK. 20-30 will have noticeable errors. 100 is awful.
This function should be called *after* `liq_write_remapped_image()`. It may return `-1` if the value is not available (this is affected by `liq_set_speed()` and `liq_set_quality()`).
----
double liq_get_quantization_quality(liq_result *result);
Analoguous to `liq_get_quantization_error()`, but returns quantization error as quality value in the same 0-100 range that is used by `liq_set_quality()`.
This function should be called *after* `liq_write_remapped_image()`. It may return `-1` if the value is not available (this is affected by `liq_set_speed()` and `liq_set_quality()`).
This function can be used to add upper limit to quality options presented to the user, e.g.
liq_attr *attr = liq_attr_create();
liq_image *img = liq_image_create_rgba(…);
liq_result *res = liq_quantize_image(attr, img);
int max_attainable_quality = liq_get_quantization_quality(res);
printf("Please select quality between 0 and %d: ", max_attainable_quality);
int user_selected_quality = prompt();
if (user_selected_quality < max_attainable_quality) {
liq_set_quality(user_selected_quality, 0);
liq_result_destroy(res);
res = liq_quantize_image(attr, img);
}
liq_write_remapped_image(…);
----
void liq_set_log_callback(liq_attr*, liq_log_callback_function*, void *user_info);
<p>
void log_callback_function(const liq_attr*, const char *message, void *user_info) {}
----
void liq_set_log_flush_callback(liq_attr*, liq_log_flush_callback_function*, void *user_info);
<p>
void log_flush_callback_function(const liq_attr*, void *user_info) {}
Sets up callback function to be called when the library reports work progress or errors. The callback must not call any library functions.
`user_info` value will be passed to the callback.
`NULL` callback clears the current callback.
In the log callback the `message` is a zero-terminated string containing informative message to output. It is valid only until the callback returns.
`liq_set_log_flush_callback()` sets up callback function that will be called after the last log callback, which can be used to flush buffers and free resources used by the log callback.
----
liq_attr* liq_attr_create_with_allocator(void* (*malloc)(size_t), void (*free)(void*));
Same as `liq_attr_create`, but uses given `malloc` and `free` replacements to allocate all memory used by the library.
The `malloc` function must return 16-byte aligned memory on x86 (and on other architectures memory aligned for `double` and pointers). Conversely, if your stdlib's `malloc` doesn't return appropriately aligned memory, you should use this function to provide aligned replacements.
----
liq_attr* liq_attr_copy(liq_attr *orig);
Creates an independent copy of `liq_attr`. The copy should also be freed using `liq_attr_destroy()`.
---
liq_error liq_set_output_gamma(liq_result* res, double gamma);
Sets gamma correction for generated palette and remapped image. Must be > 0 and < 1, e.g. `0.45455` for gamma 1/2.2 in PNG images. By default output gamma is same as gamma of the input image.
----
int liq_image_get_width(const liq_image *img);
int liq_image_get_height(const liq_image *img);
double liq_get_output_gamma(const liq_result *result);
Getters for `width`, `height` and `gamma` of the input image.
If the input is invalid, these all return -1.
---
int liq_version();
Returns version of the library as an integer. Same as `LIQ_VERSION`. Human-readable version is defined as `LIQ_VERSION_STRING`.
## Multithreading
The library is stateless and doesn't use any global or thread-local storage. It doesn't use any locks.
* Different threads can perform unrelated quantizations/remappings at the same time (e.g. each thread working on a different image).
* The same `liq_attr`, `liq_result`, etc. can be accessed from different threads, but not at the same time (e.g. you can create `liq_attr` in one thread and free it in another).
The library needs to sort unique colors present in the image. Although the sorting algorithm does few things to make stack usage minimal in typical cases, there is no guarantee against extremely degenerate cases, so threads should have automatically growing stack.
### OpenMP
The library will parallelize some operations if compiled with OpenMP.
You must not increase number of maximum threads after `liq_image` has been created, as it allocates some per-thread buffers.
Callback of `liq_image_create_custom()` may be called from different threads at the same time.
## Acknowledgements
Thanks to Irfan Skiljan for helping test the first version of the library.
The library is developed by [Kornel Lesiński](mailto:%20kornel@pngquant.org).

View File

@ -1,36 +1,82 @@
-include config.mk
STATICLIB=libimagequant.a
SHAREDLIB=libimagequant.$(SOLIBSUFFIX)
SOVER=0
ifeq ($(SOLIBSUFFIX),dylib)
SHAREDLIBVER=libimagequant.$(SOVER).$(SOLIBSUFFIX)
FIX_INSTALL_NAME=install_name_tool -id $(LIBDIR)/$(SHAREDLIBVER) $(DESTDIR)$(LIBDIR)/$(SHAREDLIBVER)
else
SHAREDLIBVER=libimagequant.$(SOLIBSUFFIX).$(SOVER)
FIX_INSTALL_NAME=
endif
DLL=libimagequant.dll
DLLIMP=libimagequant_dll.a
DLLDEF=libimagequant_dll.def
JNILIB=libimagequant.jnilib
DLL=imagequant.dll
DLLIMP=imagequant_dll.a
DLLDEF=imagequant_dll.def
JNIDLL=libimagequant.dll
JNIDLLIMP=libimagequant_dll.a
JNIDLLDEF=libimagequant_dll.def
OBJS = pam.o mediancut.o blur.o mempool.o viter.o nearest.o libimagequant.o
OBJS = pam.o mediancut.o blur.o mempool.o kmeans.o nearest.o libimagequant.o
SHAREDOBJS = $(subst .o,.lo,$(OBJS))
BUILD_CONFIGURATION="$(CC) $(CFLAGS) $(LDFLAGS)"
JAVACLASSES = org/pngquant/LiqObject.class org/pngquant/PngQuant.class org/pngquant/Image.class org/pngquant/Result.class
JAVAHEADERS = $(JAVACLASSES:.class=.h)
JAVAINCLUDE = -I'$(JAVA_HOME)/include' -I'$(JAVA_HOME)/include/linux' -I'$(JAVA_HOME)/include/win32' -I'$(JAVA_HOME)/include/darwin'
DISTFILES = $(OBJS:.o=.c) *.h MANUAL.md COPYRIGHT Makefile configure
DISTFILES = $(OBJS:.o=.c) *.h README.md CHANGELOG COPYRIGHT Makefile configure imagequant.pc.in
TARNAME = libimagequant-$(VERSION)
TARFILE = $(TARNAME)-src.tar.bz2
PKGCONFIG = imagequant.pc
all: static
all: static shared
static: $(STATICLIB)
dll:
$(MAKE) CFLAGSADD="-DLIQ_EXPORT='__declspec(dllexport)'" $(DLL)
shared: $(SHAREDLIB)
dll:
$(MAKE) CFLAGS="$(CFLAGS) -DIMAGEQUANT_EXPORTS" $(DLL)
java: $(JNILIB)
java-dll:
$(MAKE) CFLAGS="$(CFLAGS) -DIMAGEQUANT_EXPORTS" $(JNIDLL)
$(DLL) $(DLLIMP): $(OBJS)
$(CC) -fPIC -shared -o $(DLL) $(OBJS) $(LDFLAGS) -Wl,--out-implib,$(DLLIMP),--output-def,$(DLLDEF)
$(CC) -fPIC -shared -o $(DLL) $^ $(LDFLAGS) -Wl,--out-implib,$(DLLIMP),--output-def,$(DLLDEF)
$(STATICLIB): $(OBJS)
$(AR) $(ARFLAGS) $@ $^
$(SHAREDOBJS):
$(CC) -fPIC $(CFLAGS) -c $(@:.lo=.c) -o $@
libimagequant.so: $(SHAREDOBJS)
$(CC) -shared -Wl,-soname,$(SHAREDLIBVER) -o $(SHAREDLIBVER) $^ $(LDFLAGS)
ln -fs $(SHAREDLIBVER) $(SHAREDLIB)
libimagequant.dylib: $(SHAREDOBJS)
$(CC) -shared -o $(SHAREDLIBVER) $^ $(LDFLAGS)
ln -fs $(SHAREDLIBVER) $(SHAREDLIB)
$(OBJS): $(wildcard *.h) config.mk
dist: $(TARFILE)
$(JNILIB): $(JAVAHEADERS) $(STATICLIB) org/pngquant/PngQuant.c
$(CC) -g $(CFLAGS) $(LDFLAGS) $(JAVAINCLUDE) -shared -o $@ org/pngquant/PngQuant.c $(STATICLIB)
$(JNIDLL) $(JNIDLLIMP): $(JAVAHEADERS) $(OBJS) org/pngquant/PngQuant.c
$(CC) -fPIC -shared -I. $(JAVAINCLUDE) -o $(JNIDLL) $^ $(LDFLAGS) -Wl,--out-implib,$(JNIDLLIMP),--output-def,$(JNIDLLDEF)
$(JAVACLASSES): %.class: %.java
javac $<
$(JAVAHEADERS): %.h: %.class
javah -o $@ $(subst /,., $(patsubst %.class,%,$<)) && touch $@
dist: $(TARFILE) cargo
$(TARFILE): $(DISTFILES)
rm -rf $(TARFILE) $(TARNAME)
@ -40,16 +86,54 @@ $(TARFILE): $(DISTFILES)
rm -rf $(TARNAME)
-shasum $(TARFILE)
cargo:
rm -rf msvc-dist
git clone . -b msvc msvc-dist
rm -rf msvc-dist/Cargo.toml msvc-dist/org msvc-dist/rust msvc-dist/README.md msvc-dist/COPYRIGHT
cargo test
example: example.c lodepng.h lodepng.c $(STATICLIB)
$(CC) -g $(CFLAGS) -Wall example.c $(STATICLIB) -o example
lodepng.h:
curl -o lodepng.h -L https://raw.githubusercontent.com/lvandeve/lodepng/master/lodepng.h
lodepng.c:
curl -o lodepng.c -L https://raw.githubusercontent.com/lvandeve/lodepng/master/lodepng.cpp
clean:
rm -f $(OBJS) $(STATICLIB) $(TARFILE) $(DLL) $(DLLIMP) $(DLLDEF)
rm -f $(OBJS) $(SHAREDOBJS) $(SHAREDLIBVER) $(SHAREDLIB) $(STATICLIB) $(TARFILE) $(DLL) '$(DLLIMP)' '$(DLLDEF)'
rm -f $(JAVAHEADERS) $(JAVACLASSES) $(JNILIB) example
distclean: clean
rm -f config.mk
rm -f imagequant.pc
install: all $(PKGCONFIG)
install -d $(DESTDIR)$(LIBDIR)
install -d $(DESTDIR)$(PKGCONFIGDIR)
install -d $(DESTDIR)$(INCLUDEDIR)
install -m 644 $(STATICLIB) $(DESTDIR)$(LIBDIR)/$(STATICLIB)
install -m 644 $(SHAREDLIBVER) $(DESTDIR)$(LIBDIR)/$(SHAREDLIBVER)
ln -sf $(SHAREDLIBVER) $(DESTDIR)$(LIBDIR)/$(SHAREDLIB)
install -m 644 $(PKGCONFIG) $(DESTDIR)$(PKGCONFIGDIR)/$(PKGCONFIG)
install -m 644 libimagequant.h $(DESTDIR)$(INCLUDEDIR)/libimagequant.h
$(FIX_INSTALL_NAME)
uninstall:
rm -f $(DESTDIR)$(LIBDIR)/$(STATICLIB)
rm -f $(DESTDIR)$(LIBDIR)/$(SHAREDLIBVER)
rm -f $(DESTDIR)$(LIBDIR)/$(SHAREDLIB)
rm -f $(DESTDIR)$(PKGCONFIGDIR)/$(PKGCONFIG)
rm -f $(DESTDIR)$(INCLUDEDIR)/libimagequant.h
config.mk:
ifeq ($(filter %clean %distclean, $(MAKECMDGOALS)), )
./configure
endif
.PHONY: all static clean dist distclean dll
$(PKGCONFIG): config.mk
sed 's|PREFIX|$(PREFIX)|;s|VERSION|$(VERSION)|' < imagequant.pc.in > $(PKGCONFIG)
.PHONY: all static shared clean dist distclean dll java cargo
.DELETE_ON_ERROR:

679
pngquant/README.md Normal file
View File

@ -0,0 +1,679 @@
# libimagequant—Image Quantization Library
Small, portable C library for high-quality conversion of RGBA images to 8-bit indexed-color (palette) images.
It's powering [pngquant2](https://pngquant.org).
## License
Libimagequant is dual-licensed:
* For Free/Libre Open Source Software it's available under GPL v3 or later with additional [copyright notices](https://raw.github.com/ImageOptim/libimagequant/master/COPYRIGHT) for older parts of the code.
* For use in closed-source software, AppStore distribution, and other non-GPL uses, you can [obtain a commercial license](https://supso.org/projects/pngquant). Feel free to ask kornel@pngquant.org for details and custom licensing terms if you need them.
## Download
The [library](https://pngquant.org/lib) is currently a part of the [pngquant2 project](https://pngquant.org). [Repository](https://github.com/ImageOptim/libimagequant).
## Compiling and Linking
The library can be linked with ANSI C, C++, [C#](https://github.com/ImageOptim/libimagequant/blob/master/libimagequant.cs), [Rust](https://github.com/pornel/libimagequant-rust), [Java](https://github.com/ImageOptim/libimagequant/tree/master/org/pngquant) and [Golang](https://github.com/larrabee/go-imagequant) programs. It has no external dependencies.
To build on Unix-like systems run:
make static
it will create `libimagequant.a` which you can link with your program.
gcc yourprogram.c /path/to/libimagequant.a
On BSD, use `gmake` (GNU make) rather than the native `make`.
Alternatively you can compile the library with your program simply by including all `.c` files (and define `NDEBUG` to get a fast version):
gcc -std=c99 -O3 -DNDEBUG libimagequant/*.c yourprogram.c
### Building for use in Rust programs
In [Rust](https://www.rust-lang.org/) you can use Cargo to build the library. Add [`imagequant`](https://crates.io/crates/imagequant) to dependencies of the Rust program. You can also use `cargo build` in [`imagequant-sys`](https://crates.io/crates/imagequant-sys) to build `libimagequant.a` for any C-compatible language.
### Building for Java JNI
To build Java JNI interface, ensure `JAVA_HOME` is set to your JDK directory, and run:
# export JAVA_HOME=$(locate include/jni.h) # you may need to set JAVA_HOME first
make java
It will create `libimagequant.jnilib` and classes in `org/pngquant/`.
On Windows run `make java-dll` and it'll create `libimagequant.dll` instead.
### Compiling on Windows/Visual Studio
The library can be compiled with any C compiler that has at least basic support for C99 (GCC, clang, ICC, C++ Builder, even Tiny C Compiler), but Visual Studio 2012 and older are not up to date with the 1999 C standard. There are 2 options for using `libimagequant` on Windows:
* Use Visual Studio **2015** and an [MSVC-compatible branch of the library](https://github.com/ImageOptim/libimagequant/tree/msvc)
* Or use GCC from [MinGW](http://www.mingw.org) or [MSYS2](http://www.msys2.org/). Use GCC to build `libimagequant.a` (using the instructions above for Unix) and add it along with `libgcc.a` (shipped with the MinGW compiler) to your VC project.
### Building as shared library
To build on Unix-like systems run:
./configure --prefix=/usr
make libimagequant.so
To install on Unix-like systems run:
make install
## Overview
The basic flow is:
1. Create attributes object and configure the library.
2. Create image object from RGBA pixels or data source.
3. Perform quantization (generate palette).
4. Store remapped image and final palette.
5. Free memory.
Please note that libimagequant only handles raw uncompressed arrays of pixels in memory and is completely independent of any file format.
<p>
/* See example.c for the full code! */
#include "libimagequant.h"
liq_attr *attr = liq_attr_create();
liq_image *image = liq_image_create_rgba(attr, example_bitmap_rgba, width, height, 0);
liq_result *res;
liq_image_quantize(image, attr, &res);
liq_write_remapped_image(res, image, example_bitmap_8bpp, example_bitmap_size);
const liq_palette *pal = liq_get_palette(res);
// Save the image and the palette now.
for(int i=0; i < pal->count; i++) {
example_copy_palette_entry(pal->entries[i]);
}
// You'll need a PNG library to write to a file.
example_write_image(example_bitmap_8bpp);
liq_result_destroy(res);
liq_image_destroy(image);
liq_attr_destroy(attr);
Functions returning `liq_error` return `LIQ_OK` (`0`) on success and non-zero on error.
It's safe to pass `NULL` to any function accepting `liq_attr`, `liq_image`, `liq_result` (in that case the error code `LIQ_INVALID_POINTER` will be returned). These objects can be reused multiple times.
There are 3 ways to create image object for quantization:
* `liq_image_create_rgba()` for simple, contiguous RGBA pixel arrays (width×height×4 bytes large bitmap).
* `liq_image_create_rgba_rows()` for non-contiguous RGBA pixel arrays (that have padding between rows or reverse order, e.g. BMP).
* `liq_image_create_custom()` for RGB, ABGR, YUV and all other formats that can be converted on-the-fly to RGBA (you have to supply the conversion function).
Note that "image" here means raw uncompressed pixels. If you have a compressed image file, such as PNG, you must use another library (e.g. libpng or lodepng) to decode it first.
You'll find full example code in "example.c" file in the library source directory.
## Functions
----
liq_attr* liq_attr_create(void);
Returns object that will hold initial settings (attributes) for the library. The object should be freed using `liq_attr_destroy()` after it's no longer needed.
Returns `NULL` in the unlikely case that the library cannot run on the current machine (e.g. the library has been compiled for SSE-capable x86 CPU and run on VIA C3 CPU).
----
liq_error liq_set_max_colors(liq_attr* attr, int colors);
Specifies maximum number of colors to use. The default is 256. Instead of setting a fixed limit it's better to use `liq_set_quality()`.
The first argument is attributes object from `liq_attr_create()`.
Returns `LIQ_VALUE_OUT_OF_RANGE` if number of colors is outside the range 2-256.
----
int liq_get_max_colors(liq_attr* attr);
Returns the value set by `liq_set_max_colors()`.
----
liq_error liq_set_quality(liq_attr* attr, int minimum, int maximum);
Quality is in range `0` (worst) to `100` (best) and values are analoguous to JPEG quality (i.e. `80` is usually good enough).
Quantization will attempt to use the lowest number of colors needed to achieve `maximum` quality. `maximum` value of `100` is the default and means conversion as good as possible.
If it's not possible to convert the image with at least `minimum` quality (i.e. 256 colors is not enough to meet the minimum quality), then `liq_image_quantize()` will fail. The default minimum is `0` (proceeds regardless of quality).
Quality measures how well the generated palette fits image given to `liq_image_quantize()`. If a different image is remapped with `liq_write_remapped_image()` then actual quality may be different.
Regardless of the quality settings the number of colors won't exceed the maximum (see `liq_set_max_colors()`).
The first argument is attributes object from `liq_attr_create()`.
Returns `LIQ_VALUE_OUT_OF_RANGE` if target is lower than minimum or any of them is outside the 0-100 range.
Returns `LIQ_INVALID_POINTER` if `attr` appears to be invalid.
liq_attr *attr = liq_attr_create();
liq_set_quality(attr, 50, 80); // use quality 80 if possible. Give up if quality drops below 50.
----
int liq_get_min_quality(liq_attr* attr);
Returns the lower bound set by `liq_set_quality()`.
----
int liq_get_max_quality(liq_attr* attr);
Returns the upper bound set by `liq_set_quality()`.
----
liq_image *liq_image_create_rgba(liq_attr *attr, void* pixels, int width, int height, double gamma);
Creates an object that represents the image pixels to be used for quantization and remapping. The pixel array must be contiguous run of RGBA pixels (alpha is the last component, 0 = transparent, 255 = opaque).
The first argument is attributes object from `liq_attr_create()`. The same `attr` object should be used for the entire process, from creation of images to quantization.
The `pixels` array must not be modified or freed until this object is freed with `liq_image_destroy()`. See also `liq_image_set_memory_ownership()`.
`width` and `height` are dimensions in pixels. An image 10x10 pixel large will need a 400-byte array.
If the `gamma` argument is `0`, then the default of 1/2.2 [gamma](https://en.wikipedia.org/wiki/Gamma_correction) is assumed, which is good for most sRGB images.
Otherwise `gamma` must be > 0 and < 1, e.g. `0.45455` (1/2.2) or `0.55555` (1/1.8). Generated palette will use the same gamma unless `liq_set_output_gamma()` is used. If `liq_set_output_gamma` is not used, then it only affects whether brighter or darker areas of the image will get more palette colors allocated.
Returns `NULL` on failure, e.g. if `pixels` is `NULL` or `width`/`height` is <= 0.
----
liq_image *liq_image_create_rgba_rows(liq_attr *attr, void* rows[], int width, int height, double gamma);
Same as `liq_image_create_rgba()`, but takes an array of pointers to rows of pixels. This allows defining images with reversed rows (like in BMP), "stride" different than width or using only fragment of a larger bitmap, etc.
The `rows` array must have at least `height` elements, and each row must be at least `width` RGBA pixels wide.
unsigned char *bitmap = …;
void *rows = malloc(height * sizeof(void*));
int bytes_per_row = width * 4 + padding; // stride
for(int i=0; i < height; i++) {
rows[i] = bitmap + i * bytes_per_row;
}
liq_image *img = liq_image_create_rgba_rows(attr, rows, width, height, 0);
// …
liq_image_destroy(img);
free(rows);
The row pointers and pixels must not be modified or freed until this object is freed with `liq_image_destroy()` (you can change that with `liq_image_set_memory_ownership()`).
See also `liq_image_create_rgba()` and `liq_image_create_custom()`.
----
liq_error liq_image_quantize(liq_image *const input_image, liq_attr *const attr, liq_result **out_result);
Performs quantization (palette generation) based on settings in `attr` (from `liq_attr_create()`) and pixels of the image.
Returns `LIQ_OK` if quantization succeeds and sets `liq_result` pointer in `out_result`. The last argument is used for receiving the `result` object:
liq_result *result;
if (LIQ_OK == liq_image_quantize(img, attr, &result)) { // Note &result
// result pointer is valid here
}
Returns `LIQ_QUALITY_TOO_LOW` if quantization fails due to limit set in `liq_set_quality()`.
See `liq_write_remapped_image()`.
If you want to generate one palette for multiple images at once, see `liq_histogram_create()`.
----
liq_error liq_set_dithering_level(liq_result *res, float dither_level);
Enables/disables dithering in `liq_write_remapped_image()`. Dithering level must be between `0` and `1` (inclusive). Dithering level `0` enables fast non-dithered remapping. Otherwise a variation of Floyd-Steinberg error diffusion is used.
Precision of the dithering algorithm depends on the speed setting, see `liq_set_speed()`.
Returns `LIQ_VALUE_OUT_OF_RANGE` if the dithering level is outside the 0-1 range.
----
liq_error liq_write_remapped_image(liq_result *result, liq_image *input_image, void *buffer, size_t buffer_size);
Remaps the image to palette and writes its pixels to the given buffer, 1 pixel per byte.
The buffer must be large enough to fit the entire image, i.e. width×height bytes large. For safety, pass the size of the buffer as `buffer_size`.
For best performance call `liq_get_palette()` *after* this function, as palette is improved during remapping (except when `liq_histogram_quantize()` is used).
Returns `LIQ_BUFFER_TOO_SMALL` if given size of the buffer is not enough to fit the entire image.
int buffer_size = width*height;
char *buffer = malloc(buffer_size);
if (LIQ_OK == liq_write_remapped_image(result, input_image, buffer, buffer_size)) {
liq_palette *pal = liq_get_palette(result);
// save image
}
See `liq_get_palette()`.
The buffer is assumed to be contiguous, with rows ordered from top to bottom, and no gaps between rows. If you need to write rows with padding or upside-down order, then use `liq_write_remapped_image_rows()`.
Please note that it only writes raw uncompressed pixels to memory. It does not perform any PNG compression. If you'd like to create a PNG file then you need to pass the raw pixel data to another library, e.g. libpng or lodepng. See `rwpng.c` in `pngquant` project for an example how to do that.
----
const liq_palette *liq_get_palette(liq_result *result);
Returns pointer to palette optimized for image that has been quantized or remapped (final refinements are applied to the palette during remapping).
It's valid to call this method before remapping, if you don't plan to remap any images or want to use same palette for multiple images.
`liq_palette->count` contains number of colors (up to 256), `liq_palette->entries[n]` contains RGBA value for nth palette color.
The palette is **temporary and read-only**. You must copy the palette elsewhere *before* calling `liq_result_destroy()`.
Returns `NULL` on error.
----
void liq_attr_destroy(liq_attr *);
void liq_image_destroy(liq_image *);
void liq_result_destroy(liq_result *);
void liq_histogram_destroy(liq_histogram *);
Releases memory owned by the given object. Object must not be used any more after it has been freed.
Freeing `liq_result` also frees any `liq_palette` obtained from it.
## Advanced Functions
----
liq_error liq_set_speed(liq_attr* attr, int speed);
Higher speed levels disable expensive algorithms and reduce quantization precision. The default speed is `4`. Speed `1` gives marginally better quality at significant CPU cost. Speed `10` has usually 5% lower quality, but is 8 times faster than the default.
High speeds combined with `liq_set_quality()` will use more colors than necessary and will be less likely to meet minimum required quality.
<table><caption>Features dependent on speed</caption>
<tr><th>Noise-sensitive dithering</th><td>speed 1 to 5</td></tr>
<tr><th>Forced posterization</th><td>8-10 or if image has more than million colors</td></tr>
<tr><th>Quantization error known</th><td>1-7 or if minimum quality is set</td></tr>
<tr><th>Additional quantization techniques</th><td>1-6</td></tr>
</table>
Returns `LIQ_VALUE_OUT_OF_RANGE` if the speed is outside the 1-10 range.
----
int liq_get_speed(liq_attr* attr);
Returns the value set by `liq_set_speed()`.
----
liq_error liq_set_min_opacity(liq_attr* attr, int min);
Alpha values higher than this will be rounded to opaque. This is a workaround for Internet Explorer 6, but because this browser is not used any more, this option is deprecated and will be removed. The default is `255` (no change).
Returns `LIQ_VALUE_OUT_OF_RANGE` if the value is outside the 0-255 range.
----
int liq_get_min_opacity(liq_attr* attr);
Returns the value set by `liq_set_min_opacity()`.
----
liq_set_min_posterization(liq_attr* attr, int bits);
Ignores given number of least significant bits in all channels, posterizing image to `2^bits` levels. `0` gives full quality. Use `2` for VGA or 16-bit RGB565 displays, `4` if image is going to be output on a RGB444/RGBA4444 display (e.g. low-quality textures on Android).
Returns `LIQ_VALUE_OUT_OF_RANGE` if the value is outside the 0-4 range.
----
int liq_get_min_posterization(liq_attr* attr);
Returns the value set by `liq_set_min_posterization()`.
----
liq_set_last_index_transparent(liq_attr* attr, int is_last);
`0` (default) makes alpha colors sorted before opaque colors. Non-`0` mixes colors together except completely transparent color, which is moved to the end of the palette. This is a workaround for programs that blindly assume the last palette entry is transparent.
----
liq_image *liq_image_create_custom(liq_attr *attr, liq_image_get_rgba_row_callback *row_callback, void *user_info, int width, int height, double gamma);
<p>
void image_get_rgba_row_callback(liq_color row_out[], int row_index, int width, void *user_info) {
for(int column_index=0; column_index < width; column_index++) {
row_out[column_index] = /* generate pixel at (row_index, column_index) */;
}
}
Creates image object that will use callback to read image data. This allows on-the-fly conversion of images that are not in the RGBA color space.
`user_info` value will be passed to the callback. It may be useful for storing pointer to program's internal representation of the image.
The callback must read/generate `row_index`-th row and write its RGBA pixels to the `row_out` array. Row `width` is given for convenience and will always equal to image width.
The callback will be called multiple times for each row. Quantization and remapping require at least two full passes over image data, so caching of callback's work makes no sense — in such case it's better to convert entire image and use `liq_image_create_rgba()` instead.
To use RGB image:
void rgb_to_rgba_callback(liq_color row_out[], int row_index, int width, void *user_info) {
unsigned char *rgb_row = ((unsigned char *)user_info) + 3*width*row_index;
for(int i=0; i < width; i++) {
row_out[i].r = rgb_row[i*3];
row_out[i].g = rgb_row[i*3+1];
row_out[i].b = rgb_row[i*3+2];
row_out[i].a = 255;
}
}
liq_image *img = liq_image_create_custom(attr, rgb_to_rgba_callback, rgb_bitmap, width, height, 0);
The library doesn't support RGB bitmaps "natively", because supporting only single format allows compiler to inline more code, 4-byte pixel alignment is faster, and SSE instructions operate on 4 values at once, so alpha support is almost free.
----
liq_error liq_image_set_memory_ownership(liq_image *image, int ownership_flags);
Passes ownership of image pixel data and/or its rows array to the `liq_image` object, so you don't have to free it yourself. Memory owned by the object will be freed at its discretion with `free` function specified in `liq_attr_create_with_allocator()` (by default it's stdlib's `free()`).
* `LIQ_OWN_PIXELS` makes pixel array owned by the object. The pixels will be freed automatically at any point when it's no longer needed. If you set this flag you must **not** free the pixel array yourself. If the image has been created with `liq_image_create_rgba_rows()` then the starting address of the array of pixels is assumed to be the lowest address of any row.
* `LIQ_OWN_ROWS` makes array of row pointers (but not the pixels pointed by these rows) owned by the object. Rows will be freed when object is deallocated. If you set this flag you must **not** free the rows array yourself. This flag is valid only if the object has been created with `liq_image_create_rgba_rows()`.
These flags can be combined with binary *or*, i.e. `LIQ_OWN_PIXELS | LIQ_OWN_ROWS`.
This function must not be used if the image has been created with `liq_image_create_custom()`.
Returns `LIQ_VALUE_OUT_OF_RANGE` if invalid flags are specified or the image object only takes pixels from a callback.
----
liq_error liq_image_set_background(liq_image *image, liq_image *background_image);
Analyze and remap this image with assumption that it will be always presented exactly on top of this background.
When this image is remapped to a palette with a fully transparent color (use `liq_image_add_fixed_color()` to ensure this) pixels that are better represented by the background than the palette will be made transparent. This function can be used to improve quality of animated GIFs by setting previous animation frame as the background.
This function takes full ownership of the background image, so you should **not** free the background object. It will be freed automatically together with the foreground image.
Returns `LIQ_BUFFER_TOO_SMALL` if the background image has a different size than the foreground.
----
liq_error liq_image_set_importance_map(liq_image *image, unsigned char map[], size_t buffer_size, liq_ownership ownership);
Impotance map controls which areas of the image get more palette colors. Pixels corresponding to 0 values in the map are completely ignored. The higher the value the more weight is placed on the given pixel, giving it higher chance of influencing the final palette.
The map is one byte per pixel and must have the same size as the image (width×height bytes). `buffer_size` argument is used to double-check that.
If the `ownership` is `LIQ_COPY_PIXELS` then the `map` content be copied immediately (it's up to you to ensure the `map` memory is freed).
If the `ownership` is `LIQ_OWN_PIXELS` then the `map` memory will be owned by the image and will be freed automatically when the image is freed. If a custom allocator has been set using `liq_attr_create_with_allocator()`, the `map` must be allocated using the same allocator.
Returns `LIQ_INVALID_POINTER` if any pointer is `NULL`, `LIQ_BUFFER_TOO_SMALL` if the `buffer_size` does not match the image size, and `LIQ_UNSUPPORTED` if `ownership` isn't a valid value.
----
liq_error liq_write_remapped_image_rows(liq_result *result, liq_image *input_image, unsigned char **row_pointers);
Similar to `liq_write_remapped_image()`. Writes remapped image, at 1 byte per pixel, to each row pointed by `row_pointers` array. The array must have at least as many elements as height of the image, and each row must have at least as many bytes as width of the image. Rows must not overlap.
For best performance call `liq_get_palette()` *after* this function, as remapping may change the palette (except when `liq_histogram_quantize()` is used).
Returns `LIQ_INVALID_POINTER` if `result` or `input_image` is `NULL`.
----
double liq_get_quantization_error(liq_result *result);
Returns mean square error of quantization (square of difference between pixel values in the source image and its remapped version). Alpha channel, gamma correction and approximate importance of pixels is taken into account, so the result isn't exactly the mean square error of all channels.
For most images MSE 1-5 is excellent. 7-10 is OK. 20-30 will have noticeable errors. 100 is awful.
This function may return `-1` if the value is not available (this happens when a high speed has been requested, the image hasn't been remapped yet, and quality limit hasn't been set, see `liq_set_speed()` and `liq_set_quality()`). The value is not updated when multiple images are remapped, it applies only to the image used in `liq_image_quantize()` or the first image that has been remapped. See `liq_get_remapping_error()`.
----
double liq_get_remapping_error(liq_result *result);
Returns mean square error of last remapping done (square of difference between pixel values in the remapped image and its remapped version). Alpha channel and gamma correction are taken into account, so the result isn't exactly the mean square error of all channels.
This function may return `-1` if the value is not available (this happens when a high speed has been requested or the image hasn't been remapped yet).
----
double liq_get_quantization_quality(liq_result *result);
Analoguous to `liq_get_quantization_error()`, but returns quantization error as quality value in the same 0-100 range that is used by `liq_set_quality()`.
It may return `-1` if the value is not available (see note in `liq_get_quantization_error()`).
This function can be used to add upper limit to quality options presented to the user, e.g.
liq_attr *attr = liq_attr_create();
liq_image *img = liq_image_create_rgba(…);
liq_result *res;
liq_image_quantize(img, attr, &res);
int max_attainable_quality = liq_get_quantization_quality(res);
printf("Please select quality between 0 and %d: ", max_attainable_quality);
int user_selected_quality = prompt();
if (user_selected_quality < max_attainable_quality) {
liq_set_quality(user_selected_quality, 0);
liq_result_destroy(res);
liq_image_quantize(img, attr, &res);
}
liq_write_remapped_image(…);
----
double liq_get_remapping_quality(liq_result *result);
Analoguous to `liq_get_remapping_error()`, but returns quantization error as quality value in the same 0-100 range that is used by `liq_set_quality()`.
----
void liq_set_log_callback(liq_attr*, liq_log_callback_function*, void *user_info);
<p>
void log_callback_function(const liq_attr*, const char *message, void *user_info) {}
----
void liq_set_log_flush_callback(liq_attr*, liq_log_flush_callback_function*, void *user_info);
<p>
void log_flush_callback_function(const liq_attr*, void *user_info) {}
Sets up callback function to be called when the library reports status or errors. The callback must not call any library functions.
`user_info` value will be passed through to the callback. It can be `NULL`.
`NULL` callback clears the current callback.
In the log callback the `message` is a zero-terminated string containing informative message to output. It is valid only until the callback returns, so you must copy it.
`liq_set_log_flush_callback()` sets up callback function that will be called after the last log callback, which can be used to flush buffers and free resources used by the log callback.
----
void liq_set_progress_callback(liq_attr*, liq_progress_callback_function*, void *user_info);
void liq_result_set_progress_callback(liq_result*, liq_progress_callback_function*, void *user_info);
<p>
int progress_callback_function(const liq_attr*, float progress_percent, void *user_info) {}
Sets up callback function to be called while the library is processing images. The callback may abort processing by returning `0`.
Setting callback to `NULL` clears the current callback. `liq_set_progress_callback` is for quantization progress, and `liq_result_set_progress_callback` is for remapping progress (currently only dithered remapping reports progress).
`user_info` value will be passed through to the callback. It can be `NULL`.
The callback must not call any library functions.
`progress_percent` is a value between 0 and 100 that estimates how much of the current task has been done.
The callback should return `1` to continue the operation, and `0` to abort current operation.
----
liq_attr* liq_attr_create_with_allocator(void* (*malloc)(size_t), void (*free)(void*));
Same as `liq_attr_create`, but uses given `malloc` and `free` replacements to allocate all memory used by the library.
The `malloc` function must return 16-byte aligned memory on x86 (and on other architectures memory aligned for `double` and pointers). Conversely, if your stdlib's `malloc` doesn't return appropriately aligned memory, you should use this function to provide aligned replacements.
----
liq_attr* liq_attr_copy(liq_attr *orig);
Creates an independent copy of `liq_attr`. The copy should also be freed using `liq_attr_destroy()`.
---
liq_error liq_set_output_gamma(liq_result* res, double gamma);
Sets gamma correction for generated palette and remapped image. Must be > 0 and < 1, e.g. `0.45455` for gamma 1/2.2 in PNG images. By default output gamma is same as gamma of the input image.
----
int liq_image_get_width(const liq_image *img);
int liq_image_get_height(const liq_image *img);
double liq_get_output_gamma(const liq_result *result);
Getters for `width`, `height` and `gamma` of the input image.
If the input is invalid, these all return -1.
---
liq_error liq_image_add_fixed_color(liq_image* img, liq_color color);
liq_error liq_histogram_add_fixed_color(liq_histogram* hist, liq_color color, double gamma);
Reserves a color in the output palette created from this image. It behaves as if the given color was used in the image and was very important.
RGB values of `liq_color` are assumed to have the same gamma as the image. For the histogram function, the `gamma` can be `0` (see `liq_image_create_rgba()`).
It must be called before the image is quantized.
Returns error if more than 256 colors are added. If image is quantized to fewer colors than the number of fixed colors added, then excess fixed colors will be ignored.
For histograms see also a more flexible `liq_histogram_add_colors()`.
---
int liq_version();
Returns version of the library as an integer. Same as `LIQ_VERSION`. Human-readable version is defined as `LIQ_VERSION_STRING`.
## Multiple images with the same palette
It's possible to efficiently generate a single palette that is optimal for multiple images, e.g. for an APNG animation. This is done by collecting statistics of images in a `liq_histogram` object.
liq_attr *attr = liq_attr_create();
liq_histogram *hist = liq_histogram_create(attr);
liq_image *image1 = liq_image_create_rgba(attr, example_bitmap_rgba1, width, height, 0);
liq_histogram_add_image(hist, attr, image1);
liq_image *image2 = liq_image_create_rgba(attr, example_bitmap_rgba2, width, height, 0);
liq_histogram_add_image(hist, attr, image2);
liq_result *result;
liq_error err = liq_histogram_quantize(attr, hist, &result);
if (LIQ_OK == err) {
// result will contain shared palette best for both image1 and image2
}
---
liq_histogram *liq_histogram_create(liq_attr *attr);
Creates histogram object that will be used to collect color statistics from multiple images. It must be freed using `liq_histogram_destroy()`.
All options should be set on `attr` before the histogram object is created. Options changed later may not have effect.
---
liq_error liq_histogram_add_image(liq_histogram *hist, liq_attr *attr, liq_image* image);
"Learns" colors from the image, which will be later used to generate the palette.
After the image is added to the histogram it may be freed to save memory (but it's more efficient to keep the image object if it's going to be used for remapping).
Fixed colors added to the image are also added to the histogram. If total number of fixed colors exceeds 256, this function will fail with `LIQ_BUFFER_TOO_SMALL`.
---
liq_error liq_histogram_add_colors(liq_histogram *hist, liq_attr *attr, liq_histogram_entry entries[], int num_entries, double gamma);
Alternative to `liq_histogram_add_image()`. Intead of counting colors in an image, it directly takes an array of colors and their counts (see `liq_histogram_entry` in `libimagequant.h`). This function is only useful if you already have a histogram of the image from another source.
For description of gamma, see `liq_image_create_rgba()`.
---
liq_error liq_histogram_quantize(liq_histogram *const hist, liq_attr *const attr, liq_result **out_result);
Generates palette from the histogram. On success returns `LIQ_OK` and writes `liq_result*` pointer to `out_result`. Use it as follows:
liq_result *result;
liq_error err = liq_histogram_quantize(attr, hist, &result);
if (LIQ_OK == err) {
// Use result here to remap and get palette
}
Returns `LIQ_QUALITY_TOO_LOW` if the palette is worse than limit set in `liq_set_quality()`. One histogram object can be quantized only once.
Palette generated using this function won't be improved during remapping. If you're generating palette for only one image, it's better to use `liq_image_quantize()`.
## Working with GIF
The library can generate palettes for GIF images. To ensure correct transparency is used you need to preprocess the image yourself and replace alpha values other than 0 or 255 with one of these.
For animated GIFs see `liq_image_set_background()` which remaps images for GIF's "keep" frame disposal method. See [gif.ski](https://gif.ski).
## Multithreading
The library is stateless and doesn't use any global or thread-local storage. It doesn't use any locks.
* Different threads can perform unrelated quantizations/remappings at the same time (e.g. each thread working on a different image).
* The same `liq_attr`, `liq_result`, etc. can be accessed from different threads, but not at the same time (e.g. you can create `liq_attr` in one thread and free it in another).
The library needs to sort unique colors present in the image. Although the sorting algorithm does few things to make stack usage minimal in typical cases, there is no guarantee against extremely degenerate cases, so threads should have automatically growing stack.
### OpenMP
The library will parallelize some operations if compiled with OpenMP.
You must not increase number of maximum threads after `liq_image` has been created, as it allocates some per-thread buffers.
Callback of `liq_image_create_custom()` may be called from different threads at the same time.
## Acknowledgements
Thanks to Irfan Skiljan for helping test the first version of the library.
The library is developed by [Kornel Lesiński](mailto:%20kornel@pngquant.org).

View File

@ -1,3 +1,21 @@
/*
© 2011-2015 by Kornel Lesiński.
This file is part of libimagequant.
libimagequant is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
libimagequant is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with libimagequant. If not, see <http://www.gnu.org/licenses/>.
*/
#include "libimagequant.h"
#include "pam.h"
@ -8,6 +26,8 @@
*/
static void transposing_1d_blur(unsigned char *restrict src, unsigned char *restrict dst, unsigned int width, unsigned int height, const unsigned int size)
{
assert(size > 0);
for(unsigned int j=0; j < height; j++) {
unsigned char *restrict row = src + j*width;

126
pngquant/configure vendored
View File

@ -2,9 +2,13 @@
CONFIG="config.mk"
PREFIX="/usr/local"
LIBDIR="$PREFIX/lib"
INCLUDEDIR="$PREFIX/include"
PKGCONFIGDIR="$LIBDIR/pkgconfig"
VERSION=$(grep LIQ_VERSION_STRING libimagequant.h | grep -Eo "2\.[0-9.]+")
DEBUG=
QUIET=0
SSE=auto
OPENMP=
EXTRA_CFLAGS=
@ -19,16 +23,23 @@ help() {
for i in "$@"; do
case $i in
--help)
--help|-h)
echo
help "--prefix= installation directory [$PREFIX]"
help "--extra-cflags= append to CFLAGS"
help "--extra-ldflags= append to LDFLAGS"
help "--prefix=<dir> installation directory [$PREFIX]"
help "--libdir=<dir> installation directory [$LIBDIR]"
help "--includedir=<dir> installation directory [$INCLUDEDIR]"
help "--pkgconfigdir=<dir> installation directory [$PKGCONFIGDIR]"
help "--extra-cflags=<flags> append to CFLAGS"
help "--extra-ldflags=<flags> append to LDFLAGS"
echo
help "--enable-debug"
help "--enable-sse/--disable-sse enable/disable SSE instructions"
echo
help "--with-openmp compile with multicore support"
help "--with-openmp=static compile with multicore support"
echo
help "CC=<compiler> use given compiler command"
help "CFLAGS=<flags> pass options to the compiler"
help "LDFLAGS=<flags> pass options to the linker"
echo
exit 0
;;
@ -51,11 +62,33 @@ for i in "$@"; do
--disable-sse)
SSE=0
;;
--quiet)
QUIET=1
;;
'')
# allows a bash quirk
;;
--with-openmp)
OPENMP=1
;;
--with-openmp=static)
OPENMP=static
;;
--prefix=*)
PREFIX=${i#*=}
LIBDIR="$PREFIX/lib"
INCLUDEDIR="$PREFIX/include"
PKGCONFIGDIR="$LIBDIR/pkgconfig"
;;
--libdir=*)
LIBDIR=${i#*=}
PKGCONFIGDIR="$LIBDIR/pkgconfig"
;;
--includedir=*)
INCLUDEDIR=${i#*=}
;;
--pkgconfigdir=*)
PKGCONFIGDIR=${i#*=}
;;
# can be used multiple times or in quotes to set multiple flags
--extra-cflags=*)
@ -65,8 +98,7 @@ for i in "$@"; do
EXTRA_LDFLAGS="$EXTRA_LDFLAGS ${i#*=}"
;;
*)
echo "error: unknown switch ${i%%=*}"
exit 1
echo "warning: unknown switch '${i%%=*}' (see $0 --help for the list)"
;;
esac
done
@ -87,13 +119,15 @@ lflags() {
}
status() {
printf "%10s: %s\n" "$1" "$2"
if [ "$QUIET" -ne 1 ]; then
printf "%10s: %s\n" "$1" "$2"
fi
}
# Append to CFLAGS if compiler supports flag, with optional prerequisite.
# Fails on errors and warnings.
conditional_cflags() {
if [ -z "$("$CC" -xc -S -o /dev/null $2 $1 <(echo) 2>&1)" ]; then
if [ -z "$(echo | "$CC" -xc -S -o /dev/null $2 $1 - 2>&1)" ]; then
cflags "$1"
fi
}
@ -104,34 +138,40 @@ error() {
exit 1
}
echo
# basic check
if ! "$CC" -xc -std=c99 <(echo "int main(){}") -o /dev/null &> /dev/null; then
error "Compiler" "$CC is no C compiler"
if [ "$QUIET" -ne 1 ]; then
echo
fi
echo > pngquant-gcccheck.c "int main(){}"
if ! "$CC" -std=c99 -o pngquant-gcccheck pngquant-gcccheck.c; then
rm -f pngquant-gcccheck pngquant-gcccheck.c
error "Compiler" "$CC failed to compile anything (make sure it's installed and supports C99)"
fi
rm -f pngquant-gcccheck pngquant-gcccheck.c
status "Compiler" "$CC"
# init flags
CFLAGS=${CFLAGS:--O3 -fno-math-errno -funroll-loops -fomit-frame-pointer -Wall}
CFLAGS=${CFLAGS:--fno-math-errno -funroll-loops -fomit-frame-pointer -Wall}
cflags "-std=c99 -I."
lflags "-lm lib/libimagequant.a"
# DEBUG
if [ -z "$DEBUG" ]; then
cflags "-DNDEBUG"
cflags "-O3 -DNDEBUG"
status "Debug" "no"
else
cflags "-g"
cflags "-O1 -g -DDEBUG"
status "Debug" "yes"
fi
# SSE
if [ "$SSE" = 'auto' ]; then
if [[ "$(uname -m)" =~ (amd|x86_)64 ||
"$(grep -E -m1 "^flags" /proc/cpuinfo)" =~ "sse" ]]; then
SSE=1
SSE=0
if type uname > /dev/null; then
if [[ "$(uname -m)" =~ "amd64" || "$(uname -m)" =~ "x86_64" ||
"$(grep -E -m1 "^flags" /proc/cpuinfo)" =~ "sse" ]]; then
SSE=1
fi
fi
fi
@ -150,15 +190,19 @@ fi
# OpenMP
if [ -n "$OPENMP" ]; then
if [[ "$("$CC" -xc -E -fopenmp <(echo -e \
"#ifdef _OPENMP
if [ "static" = "$OPENMP" ]; then
OPENMPFLAGS="-static-libgcc -Bstatic -fopenmp -Bdynamic"
else
OPENMPFLAGS="-fopenmp"
fi
if [[ "$("$CC" -xc -E $OPENMPFLAGS <(echo "#ifdef _OPENMP
#include <omp.h>
#endif") 2>&1)" =~ "omp_get_thread_num" ]]; then
cflags "-fopenmp"
lflags "-fopenmp"
cflags "$OPENMPFLAGS"
lflags "$OPENMPFLAGS"
status "OpenMP" "yes"
else
error "OpenMP" "not supported by compiler"
error "OpenMP" "not supported by compiler (please install a compiler that supports OpenMP (e.g. gcc) and specify it with the CC= argument)"
fi
else
# silence warnings about omp pragmas
@ -167,7 +211,29 @@ else
status "OpenMP" "no"
fi
echo
# Cocoa
if [[ "$OSTYPE" =~ "darwin" ]]; then
cflags "-mmacosx-version-min=10.7"
lflags "-mmacosx-version-min=10.7"
fi
if [[ "$OSTYPE" =~ "darwin" ]]; then
SOLIBSUFFIX=dylib
# Search Developer SDK paths, since Apple seems to have dropped the standard Unixy ones
XCODE_CMD="xcode-select"
XCODE_PATH=$($XCODE_CMD -p)
DIRS+=("$XCODE_PATH/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include $XCODE_PATH/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/lib")
DIRS+=("$XCODE_PATH/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/include $XCODE_PATH/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/lib")
elif [[ "$OSTYPE" =~ "msys" ]]; then
SOLIBSUFFIX=dll
else
SOLIBSUFFIX=so
fi
if [ "$QUIET" -ne 1 ]; then
echo
fi
# As of GCC 4.5, 387 fp math is significantly slower in C99 mode without this.
# Note: CPUs without SSE2 use 387 for doubles, even when SSE fp math is set.
@ -199,8 +265,12 @@ fi
echo "
# auto-generated by configure
PREFIX = $PREFIX
LIBDIR = $LIBDIR
INCLUDEDIR = $INCLUDEDIR
PKGCONFIGDIR = $PKGCONFIGDIR
VERSION = $VERSION
CC = $CC
CFLAGS = $CFLAGS
LDFLAGS = $LDFLAGS
" > $CONFIG
SOLIBSUFFIX = $SOLIBSUFFIX
" > "$CONFIG"

10
pngquant/imagequant.pc.in Normal file
View File

@ -0,0 +1,10 @@
prefix=PREFIX
includedir=${prefix}/include
libdir=${prefix}/lib
Name: imagequant
Description: Small, portable C library for high-quality conversion of RGBA images to 8-bit indexed-color (palette) images.
URL: https://pngquant.org/lib/
Version: VERSION
Libs: -L${libdir} -limagequant
Cflags: -I${includedir}

98
pngquant/kmeans.c Normal file
View File

@ -0,0 +1,98 @@
/*
** © 2011-2016 by Kornel Lesiński.
** See COPYRIGHT file for license.
*/
#include "libimagequant.h"
#include "pam.h"
#include "kmeans.h"
#include "nearest.h"
#include <stdlib.h>
#include <string.h>
#ifdef _OPENMP
#include <omp.h>
#else
#define omp_get_max_threads() 1
#define omp_get_thread_num() 0
#endif
/*
* K-Means iteration: new palette color is computed from weighted average of colors that map to that palette entry.
*/
LIQ_PRIVATE void kmeans_init(const colormap *map, const unsigned int max_threads, kmeans_state average_color[])
{
memset(average_color, 0, sizeof(average_color[0])*(KMEANS_CACHE_LINE_GAP+map->colors)*max_threads);
}
LIQ_PRIVATE void kmeans_update_color(const f_pixel acolor, const float value, const colormap *map, unsigned int match, const unsigned int thread, kmeans_state average_color[])
{
match += thread * (KMEANS_CACHE_LINE_GAP+map->colors);
average_color[match].a += acolor.a * value;
average_color[match].r += acolor.r * value;
average_color[match].g += acolor.g * value;
average_color[match].b += acolor.b * value;
average_color[match].total += value;
}
LIQ_PRIVATE void kmeans_finalize(colormap *map, const unsigned int max_threads, const kmeans_state average_color[])
{
for (unsigned int i=0; i < map->colors; i++) {
double a=0, r=0, g=0, b=0, total=0;
// Aggregate results from all threads
for(unsigned int t=0; t < max_threads; t++) {
const unsigned int offset = (KMEANS_CACHE_LINE_GAP+map->colors) * t + i;
a += average_color[offset].a;
r += average_color[offset].r;
g += average_color[offset].g;
b += average_color[offset].b;
total += average_color[offset].total;
}
if (total && !map->palette[i].fixed) {
map->palette[i].acolor = (f_pixel){
.a = a / total,
.r = r / total,
.g = g / total,
.b = b / total,
};
map->palette[i].popularity = total;
}
}
}
LIQ_PRIVATE double kmeans_do_iteration(histogram *hist, colormap *const map, kmeans_callback callback)
{
const unsigned int max_threads = omp_get_max_threads();
LIQ_ARRAY(kmeans_state, average_color, (KMEANS_CACHE_LINE_GAP+map->colors) * max_threads);
kmeans_init(map, max_threads, average_color);
struct nearest_map *const n = nearest_init(map);
hist_item *const achv = hist->achv;
const int hist_size = hist->size;
double total_diff=0;
#if __GNUC__ >= 9
#pragma omp parallel for if (hist_size > 2000) \
schedule(static) default(none) shared(achv,average_color,callback,hist_size,map,n) reduction(+:total_diff)
#else
#pragma omp parallel for if (hist_size > 2000) \
schedule(static) default(none) shared(average_color,callback) reduction(+:total_diff)
#endif
for(int j=0; j < hist_size; j++) {
float diff;
unsigned int match = nearest_search(n, &achv[j].acolor, achv[j].tmp.likely_colormap_index, &diff);
achv[j].tmp.likely_colormap_index = match;
total_diff += diff * achv[j].perceptual_weight;
kmeans_update_color(achv[j].acolor, achv[j].perceptual_weight, map, match, omp_get_thread_num(), average_color);
if (callback) callback(&achv[j], diff);
}
nearest_free(n);
kmeans_finalize(map, max_threads, average_color);
return total_diff / hist->total_perceptual_weight;
}

19
pngquant/kmeans.h Normal file
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@ -0,0 +1,19 @@
#ifndef KMEANS_H
#define KMEANS_H
// Spread memory touched by different threads at least 64B apart which I assume is the cache line size. This should avoid memory write contention.
#define KMEANS_CACHE_LINE_GAP ((64+sizeof(kmeans_state)-1)/sizeof(kmeans_state))
typedef struct {
double a, r, g, b, total;
} kmeans_state;
typedef void (*kmeans_callback)(hist_item *item, float diff);
LIQ_PRIVATE void kmeans_init(const colormap *map, const unsigned int max_threads, kmeans_state state[]);
LIQ_PRIVATE void kmeans_update_color(const f_pixel acolor, const float value, const colormap *map, unsigned int match, const unsigned int thread, kmeans_state average_color[]);
LIQ_PRIVATE void kmeans_finalize(colormap *map, const unsigned int max_threads, const kmeans_state state[]);
LIQ_PRIVATE double kmeans_do_iteration(histogram *hist, colormap *const map, kmeans_callback callback);
#endif

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164
pngquant/libimagequant.cs Normal file
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@ -0,0 +1,164 @@
/*
This is an example demonstrating use of libimagequant from C#.
This example code can be freely copied under CC0 (public domain) license.
*/
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
[StructLayout(LayoutKind.Sequential)]
struct liq_color
{
public byte r, g, b, a;
};
[StructLayout(LayoutKind.Sequential)]
struct liq_palette
{
public int count;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
public liq_color[] entries;
};
enum liq_error
{
LIQ_OK = 0,
LIQ_QUALITY_TOO_LOW = 99,
LIQ_VALUE_OUT_OF_RANGE = 100,
LIQ_OUT_OF_MEMORY,
LIQ_ABORTED,
LIQ_BITMAP_NOT_AVAILABLE,
LIQ_BUFFER_TOO_SMALL,
LIQ_INVALID_POINTER,
};
namespace liq
{
using liq_attr_ptr = IntPtr;
using liq_image_ptr = IntPtr;
using liq_result_ptr = IntPtr;
using size_t = UIntPtr;
class Liq
{
[DllImport(@"imagequant.dll")]
public static extern liq_attr_ptr liq_attr_create();
[DllImport(@"imagequant.dll")]
public static extern liq_attr_ptr liq_attr_copy(liq_attr_ptr attr);
[DllImport(@"imagequant.dll")]
public static extern void liq_attr_destroy(liq_attr_ptr attr);
[DllImport(@"imagequant.dll")]
public static extern liq_error liq_set_max_colors(liq_attr_ptr attr, int colors);
[DllImport(@"imagequant.dll")]
public static extern int liq_get_max_colors(liq_attr_ptr attr);
[DllImport(@"imagequant.dll")]
public static extern liq_error liq_set_speed(liq_attr_ptr attr, int speed);
[DllImport(@"imagequant.dll")]
public static extern int liq_get_speed(liq_attr_ptr attr);
[DllImport(@"imagequant.dll")]
public static extern liq_error liq_set_min_opacity(liq_attr_ptr attr, int min);
[DllImport(@"imagequant.dll")]
public static extern int liq_get_min_opacity(liq_attr_ptr attr);
[DllImport(@"imagequant.dll")]
public static extern liq_error liq_set_min_posterization(liq_attr_ptr attr, int bits);
[DllImport(@"imagequant.dll")]
public static extern int liq_get_min_posterization(liq_attr_ptr attr);
[DllImport(@"imagequant.dll")]
public static extern liq_error liq_set_quality(liq_attr_ptr attr, int minimum, int maximum);
[DllImport(@"imagequant.dll")]
public static extern int liq_get_min_quality(liq_attr_ptr attr);
[DllImport(@"imagequant.dll")]
public static extern int liq_get_max_quality(liq_attr_ptr attr);
[DllImport(@"imagequant.dll")]
public static extern void liq_set_last_index_transparent(liq_attr_ptr attr, int is_last);
[DllImport(@"imagequant.dll")]
public static extern liq_image_ptr liq_image_create_rgba(liq_attr_ptr attr, [In, MarshalAs(UnmanagedType.LPArray)] byte[] bitmap, int width, int height, double gamma);
[DllImport(@"imagequant.dll")]
public static extern liq_error liq_image_set_memory_ownership(liq_image_ptr image, int ownership_flags);
[DllImport(@"imagequant.dll")]
public static extern liq_error liq_image_add_fixed_color(liq_image_ptr img, liq_color color);
[DllImport(@"imagequant.dll")]
public static extern int liq_image_get_width(liq_image_ptr img);
[DllImport(@"imagequant.dll")]
public static extern int liq_image_get_height(liq_image_ptr img);
[DllImport(@"imagequant.dll")]
public static extern void liq_image_destroy(liq_image_ptr img);
[DllImport(@"imagequant.dll")]
public static extern liq_result_ptr liq_quantize_image(liq_attr_ptr attr, liq_image_ptr input_image);
[DllImport(@"imagequant.dll")]
public static extern liq_error liq_set_dithering_level(liq_result_ptr res, float dither_level);
[DllImport(@"imagequant.dll")]
public static extern liq_error liq_set_output_gamma(liq_result_ptr res, double gamma);
[DllImport(@"imagequant.dll")]
public static extern double liq_get_output_gamma(liq_result_ptr res);
[DllImport(@"imagequant.dll")]
public static extern IntPtr liq_get_palette(liq_result_ptr res);
[DllImport(@"imagequant.dll")]
public static extern liq_error liq_write_remapped_image(liq_result_ptr res, liq_image_ptr input_image, [Out, MarshalAs(UnmanagedType.LPArray)] byte[] buffer, size_t buffer_size);
[DllImport(@"imagequant.dll")]
public static extern double liq_get_quantization_error(liq_result_ptr res);
[DllImport(@"imagequant.dll")]
public static extern int liq_get_quantization_quality(liq_result_ptr res);
[DllImport(@"imagequant.dll")]
public static extern double liq_get_remapping_error(liq_result_ptr res);
[DllImport(@"imagequant.dll")]
public static extern int liq_get_remapping_quality(liq_result_ptr res);
[DllImport(@"imagequant.dll")]
public static extern void liq_result_destroy(liq_result_ptr res);
[DllImport(@"imagequant.dll")]
public static extern int liq_version();
static void Main(string[] args)
{
Console.WriteLine("library version: {0}", liq_version());
int width = 3;
int height = 1;
var attr = liq_attr_create();
if (attr == IntPtr.Zero) throw new Exception("can't create attr");
byte[] bitmap = { // R, G, B, A, R, G, B, A, ...
111, 222, 33, 255,
255, 0, 255, 255,
255, 0, 255, 255,
};
var img = liq_image_create_rgba(attr, bitmap, width, height, 0);
if (img == IntPtr.Zero) throw new Exception("can't create image");
var res = liq_quantize_image(attr, img);
if (res == IntPtr.Zero) throw new Exception("can't quantize image");
var buffer_size = width * height;
var remapped = new byte[buffer_size];
var err = liq_write_remapped_image(res, img, remapped, (UIntPtr)buffer_size);
if (err != liq_error.LIQ_OK)
{
throw new Exception("remapping error");
}
Console.WriteLine("first pixel is {0}th palette entry", remapped[0]);
liq_palette pal = (liq_palette)Marshal.PtrToStructure(liq_get_palette(res), typeof(liq_palette));
Console.WriteLine("palette entries: {0}; red of first entry: {1}", pal.count, pal.entries[0].r);
liq_image_destroy(img);
liq_result_destroy(res);
liq_attr_destroy(attr);
}
}
}

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@ -1,22 +1,30 @@
/*
* http://pngquant.org
* https://pngquant.org
*/
#ifndef LIBIMAGEQUANT_H
#define LIBIMAGEQUANT_H
#ifdef IMAGEQUANT_EXPORTS
#define LIQ_EXPORT __declspec(dllexport)
#endif
#ifndef LIQ_EXPORT
#define LIQ_EXPORT extern
#endif
#define LIQ_VERSION 20301
#define LIQ_VERSION_STRING "2.3.1"
#define LIQ_VERSION 21205
#define LIQ_VERSION_STRING "2.12.5"
#ifndef LIQ_PRIVATE
#if defined(__GNUC__) || defined (__llvm__)
#define LIQ_PRIVATE __attribute__((visibility("hidden")))
#define LIQ_NONNULL __attribute__((nonnull))
#define LIQ_USERESULT __attribute__((warn_unused_result))
#else
#define LIQ_PRIVATE
#define LIQ_NONNULL
#define LIQ_USERESULT
#endif
#endif
@ -29,6 +37,7 @@ extern "C" {
typedef struct liq_attr liq_attr;
typedef struct liq_image liq_image;
typedef struct liq_result liq_result;
typedef struct liq_histogram liq_histogram;
typedef struct liq_color {
unsigned char r, g, b, a;
@ -44,63 +53,96 @@ typedef enum liq_error {
LIQ_QUALITY_TOO_LOW = 99,
LIQ_VALUE_OUT_OF_RANGE = 100,
LIQ_OUT_OF_MEMORY,
LIQ_NOT_READY,
LIQ_ABORTED,
LIQ_BITMAP_NOT_AVAILABLE,
LIQ_BUFFER_TOO_SMALL,
LIQ_INVALID_POINTER,
LIQ_UNSUPPORTED,
} liq_error;
enum liq_ownership {LIQ_OWN_ROWS=4, LIQ_OWN_PIXELS=8};
enum liq_ownership {
LIQ_OWN_ROWS=4,
LIQ_OWN_PIXELS=8,
LIQ_COPY_PIXELS=16,
};
LIQ_EXPORT liq_attr* liq_attr_create(void);
LIQ_EXPORT liq_attr* liq_attr_create_with_allocator(void* (*malloc)(size_t), void (*free)(void*));
LIQ_EXPORT liq_attr* liq_attr_copy(liq_attr* orig);
LIQ_EXPORT void liq_attr_destroy(liq_attr* attr);
typedef struct liq_histogram_entry {
liq_color color;
unsigned int count;
} liq_histogram_entry;
LIQ_EXPORT liq_error liq_set_max_colors(liq_attr* attr, int colors);
LIQ_EXPORT int liq_get_max_colors(const liq_attr* attr);
LIQ_EXPORT liq_error liq_set_speed(liq_attr* attr, int speed);
LIQ_EXPORT int liq_get_speed(const liq_attr* attr);
LIQ_EXPORT liq_error liq_set_min_opacity(liq_attr* attr, int min);
LIQ_EXPORT int liq_get_min_opacity(const liq_attr* attr);
LIQ_EXPORT liq_error liq_set_min_posterization(liq_attr* attr, int bits);
LIQ_EXPORT int liq_get_min_posterization(const liq_attr* attr);
LIQ_EXPORT liq_error liq_set_quality(liq_attr* attr, int minimum, int maximum);
LIQ_EXPORT int liq_get_min_quality(const liq_attr* attr);
LIQ_EXPORT int liq_get_max_quality(const liq_attr* attr);
LIQ_EXPORT void liq_set_last_index_transparent(liq_attr* attr, int is_last);
LIQ_EXPORT LIQ_USERESULT liq_attr* liq_attr_create(void);
LIQ_EXPORT LIQ_USERESULT liq_attr* liq_attr_create_with_allocator(void* (*malloc)(size_t), void (*free)(void*));
LIQ_EXPORT LIQ_USERESULT liq_attr* liq_attr_copy(const liq_attr *orig) LIQ_NONNULL;
LIQ_EXPORT void liq_attr_destroy(liq_attr *attr) LIQ_NONNULL;
typedef void liq_log_callback_function(const liq_attr*, const char* message, void* user_info);
LIQ_EXPORT LIQ_USERESULT liq_histogram* liq_histogram_create(const liq_attr* attr);
LIQ_EXPORT liq_error liq_histogram_add_image(liq_histogram *hist, const liq_attr *attr, liq_image* image) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_histogram_add_colors(liq_histogram *hist, const liq_attr *attr, const liq_histogram_entry entries[], int num_entries, double gamma) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_histogram_add_fixed_color(liq_histogram *hist, liq_color color, double gamma) LIQ_NONNULL;
LIQ_EXPORT void liq_histogram_destroy(liq_histogram *hist) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_set_max_colors(liq_attr* attr, int colors) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT int liq_get_max_colors(const liq_attr* attr) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_set_speed(liq_attr* attr, int speed) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT int liq_get_speed(const liq_attr* attr) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_set_min_opacity(liq_attr* attr, int min) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT int liq_get_min_opacity(const liq_attr* attr) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_set_min_posterization(liq_attr* attr, int bits) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT int liq_get_min_posterization(const liq_attr* attr) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_set_quality(liq_attr* attr, int minimum, int maximum) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT int liq_get_min_quality(const liq_attr* attr) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT int liq_get_max_quality(const liq_attr* attr) LIQ_NONNULL;
LIQ_EXPORT void liq_set_last_index_transparent(liq_attr* attr, int is_last) LIQ_NONNULL;
typedef void liq_log_callback_function(const liq_attr*, const char *message, void* user_info);
typedef void liq_log_flush_callback_function(const liq_attr*, void* user_info);
LIQ_EXPORT void liq_set_log_callback(liq_attr*, liq_log_callback_function*, void* user_info);
LIQ_EXPORT void liq_set_log_flush_callback(liq_attr*, liq_log_flush_callback_function*, void* user_info);
LIQ_EXPORT liq_image* liq_image_create_rgba_rows(liq_attr* attr, void* rows[], int width, int height, double gamma);
LIQ_EXPORT liq_image* liq_image_create_rgba(liq_attr* attr, void* bitmap, int width, int height, double gamma);
typedef int liq_progress_callback_function(float progress_percent, void* user_info);
LIQ_EXPORT void liq_attr_set_progress_callback(liq_attr*, liq_progress_callback_function*, void* user_info);
LIQ_EXPORT void liq_result_set_progress_callback(liq_result*, liq_progress_callback_function*, void* user_info);
// The rows and their data are not modified. The type of `rows` is non-const only due to a bug in C's typesystem design.
LIQ_EXPORT LIQ_USERESULT liq_image *liq_image_create_rgba_rows(const liq_attr *attr, void *const rows[], int width, int height, double gamma) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT liq_image *liq_image_create_rgba(const liq_attr *attr, const void *bitmap, int width, int height, double gamma) LIQ_NONNULL;
typedef void liq_image_get_rgba_row_callback(liq_color row_out[], int row, int width, void* user_info);
LIQ_EXPORT liq_image* liq_image_create_custom(liq_attr* attr, liq_image_get_rgba_row_callback* row_callback, void* user_info, int width, int height, double gamma);
LIQ_EXPORT LIQ_USERESULT liq_image *liq_image_create_custom(const liq_attr *attr, liq_image_get_rgba_row_callback *row_callback, void* user_info, int width, int height, double gamma);
LIQ_EXPORT liq_error liq_image_set_memory_ownership(liq_image* image, int ownership_flags);
LIQ_EXPORT int liq_image_get_width(const liq_image* img);
LIQ_EXPORT int liq_image_get_height(const liq_image* img);
LIQ_EXPORT void liq_image_destroy(liq_image* img);
LIQ_EXPORT liq_error liq_image_set_memory_ownership(liq_image *image, int ownership_flags) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_image_set_background(liq_image *img, liq_image *background_image) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_image_set_importance_map(liq_image *img, unsigned char buffer[], size_t buffer_size, enum liq_ownership memory_handling) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_image_add_fixed_color(liq_image *img, liq_color color) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT int liq_image_get_width(const liq_image *img) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT int liq_image_get_height(const liq_image *img) LIQ_NONNULL;
LIQ_EXPORT void liq_image_destroy(liq_image *img) LIQ_NONNULL;
LIQ_EXPORT liq_result* liq_quantize_image(liq_attr* options, liq_image* input_image);
LIQ_EXPORT LIQ_USERESULT liq_error liq_histogram_quantize(liq_histogram *const input_hist, liq_attr *const options, liq_result **result_output) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT liq_error liq_image_quantize(liq_image *const input_image, liq_attr *const options, liq_result **result_output) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_set_dithering_level(liq_result* res, float dither_level);
LIQ_EXPORT liq_error liq_set_output_gamma(liq_result* res, double gamma);
LIQ_EXPORT double liq_get_output_gamma(const liq_result* result);
LIQ_EXPORT liq_error liq_set_dithering_level(liq_result *res, float dither_level) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_set_output_gamma(liq_result* res, double gamma) LIQ_NONNULL;
LIQ_EXPORT LIQ_USERESULT double liq_get_output_gamma(const liq_result *result) LIQ_NONNULL;
LIQ_EXPORT const liq_palette* liq_get_palette(liq_result* result);
LIQ_EXPORT LIQ_USERESULT const liq_palette *liq_get_palette(liq_result *result) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_write_remapped_image(liq_result* result, liq_image* input_image, void* buffer, size_t buffer_size);
LIQ_EXPORT liq_error liq_write_remapped_image_rows(liq_result* result, liq_image* input_image, unsigned char** row_pointers);
LIQ_EXPORT liq_error liq_write_remapped_image(liq_result *result, liq_image *input_image, void *buffer, size_t buffer_size) LIQ_NONNULL;
LIQ_EXPORT liq_error liq_write_remapped_image_rows(liq_result *result, liq_image *input_image, unsigned char **row_pointers) LIQ_NONNULL;
LIQ_EXPORT double liq_get_quantization_error(liq_result* result);
LIQ_EXPORT int liq_get_quantization_quality(liq_result* result);
LIQ_EXPORT double liq_get_quantization_error(const liq_result *result) LIQ_NONNULL;
LIQ_EXPORT int liq_get_quantization_quality(const liq_result *result) LIQ_NONNULL;
LIQ_EXPORT double liq_get_remapping_error(const liq_result *result) LIQ_NONNULL;
LIQ_EXPORT int liq_get_remapping_quality(const liq_result *result) LIQ_NONNULL;
LIQ_EXPORT void liq_result_destroy(liq_result*);
LIQ_EXPORT void liq_result_destroy(liq_result *) LIQ_NONNULL;
LIQ_EXPORT int liq_version(void);
// Deprecated
LIQ_EXPORT LIQ_USERESULT liq_result *liq_quantize_image(liq_attr *options, liq_image *input_image) LIQ_NONNULL;
#ifdef __cplusplus
}

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@ -1,15 +1,9 @@
/*
** Copyright (C) 1989, 1991 by Jef Poskanzer.
** Copyright (C) 1997, 2000, 2002 by Greg Roelofs; based on an idea by
** Stefan Schneider.
** © 2009-2013 by Kornel Lesinski.
** © 2009-2018 by Kornel Lesiński.
** © 1989, 1991 by Jef Poskanzer.
** © 1997, 2000, 2002 by Greg Roelofs; based on an idea by Stefan Schneider.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
** See COPYRIGHT file for license.
*/
#include <stdlib.h>
@ -21,7 +15,7 @@
#define index_of_channel(ch) (offsetof(f_pixel,ch)/sizeof(float))
static f_pixel averagepixels(unsigned int clrs, const hist_item achv[], float min_opaque_val, const f_pixel center);
static f_pixel averagepixels(unsigned int clrs, const hist_item achv[]);
struct box {
f_pixel color;
@ -46,7 +40,7 @@ static f_pixel box_variance(const hist_item achv[], const struct box *box)
double variancea=0, variancer=0, varianceg=0, varianceb=0;
for(unsigned int i = 0; i < box->colors; ++i) {
f_pixel px = achv[box->ind + i].acolor;
const f_pixel px = achv[box->ind + i].acolor;
double weight = achv[box->ind + i].adjusted_weight;
variancea += variance_diff(mean.a - px.a, 2.0/256.0)*weight;
variancer += variance_diff(mean.r - px.r, 1.0/256.0)*weight;
@ -97,7 +91,7 @@ inline static unsigned int qsort_pivot(const hist_item *const base, const unsign
const unsigned int aidx=8, bidx=len/2, cidx=len-1;
const unsigned int a=base[aidx].tmp.sort_value, b=base[bidx].tmp.sort_value, c=base[cidx].tmp.sort_value;
return (a < b) ? ((b < c) ? bidx : ((a < c) ? cidx : aidx ))
: ((b > c) ? bidx : ((a < c) ? aidx : cidx ));
: ((b > c) ? bidx : ((a < c) ? aidx : cidx ));
}
ALWAYS_INLINE static unsigned int qsort_partition(hist_item *const base, const unsigned int len);
@ -124,7 +118,7 @@ inline static unsigned int qsort_partition(hist_item *const base, const unsigned
}
/** quick select algorithm */
static void hist_item_sort_range(hist_item *base, unsigned int len, unsigned int sort_start)
static void hist_item_sort_range(hist_item base[], unsigned int len, unsigned int sort_start)
{
for(;;) {
const unsigned int l = qsort_partition(base, len), r = l+1;
@ -140,7 +134,7 @@ static void hist_item_sort_range(hist_item *base, unsigned int len, unsigned int
}
/** sorts array to make sum of weights lower than halfvar one side, returns edge between <halfvar and >halfvar parts of the set */
static hist_item *hist_item_sort_halfvar(hist_item *base, unsigned int len, double *const lowervar, const double halfvar)
static hist_item *hist_item_sort_halfvar(hist_item base[], unsigned int len, double *const lowervar, const double halfvar)
{
do {
const unsigned int l = qsort_partition(base, len), r = l+1;
@ -181,7 +175,7 @@ typedef struct {
static int comparevariance(const void *ch1, const void *ch2)
{
return ((const channelvariance*)ch1)->variance > ((const channelvariance*)ch2)->variance ? -1 :
(((const channelvariance*)ch1)->variance < ((const channelvariance*)ch2)->variance ? 1 : 0);
(((const channelvariance*)ch1)->variance < ((const channelvariance*)ch2)->variance ? 1 : 0);
}
/** Finds which channels need to be sorted first and preproceses achv for fast sort */
@ -191,20 +185,29 @@ static double prepare_sort(struct box *b, hist_item achv[])
** Sort dimensions by their variance, and then sort colors first by dimension with highest variance
*/
channelvariance channels[4] = {
{index_of_channel(a), b->variance.a},
{index_of_channel(r), b->variance.r},
{index_of_channel(g), b->variance.g},
{index_of_channel(b), b->variance.b},
{index_of_channel(a), b->variance.a},
};
qsort(channels, 4, sizeof(channels[0]), comparevariance);
for(unsigned int i=0; i < b->colors; i++) {
const float *chans = (const float *)&achv[b->ind + i].acolor;
const unsigned int ind1 = b->ind;
const unsigned int colors = b->colors;
#if __GNUC__ >= 9
#pragma omp parallel for if (colors > 25000) \
schedule(static) default(none) shared(achv, channels, colors, ind1)
#else
#pragma omp parallel for if (colors > 25000) \
schedule(static) default(none) shared(achv, channels)
#endif
for(unsigned int i=0; i < colors; i++) {
const float *chans = (const float *)&achv[ind1 + i].acolor;
// Only the first channel really matters. When trying median cut many times
// with different histogram weights, I don't want sort randomness to influence outcome.
achv[b->ind + i].tmp.sort_value = ((unsigned int)(chans[channels[0].chan]*65535.0)<<16) |
(unsigned int)((chans[channels[2].chan] + chans[channels[1].chan]/2.0 + chans[channels[3].chan]/4.0)*65535.0);
achv[ind1 + i].tmp.sort_value = ((unsigned int)(chans[channels[0].chan]*65535.0)<<16) |
(unsigned int)((chans[channels[2].chan] + chans[channels[1].chan]/2.0 + chans[channels[3].chan]/4.0)*65535.0);
}
const f_pixel median = get_median(b, achv);
@ -212,6 +215,8 @@ static double prepare_sort(struct box *b, hist_item achv[])
// box will be split to make color_weight of each side even
const unsigned int ind = b->ind, end = ind+b->colors;
double totalvar = 0;
#pragma omp parallel for if (end - ind > 15000) \
schedule(static) default(shared) reduction(+:totalvar)
for(unsigned int j=ind; j < end; j++) totalvar += (achv[j].color_weight = color_weight(median, achv[j]));
return totalvar / 2.0;
}
@ -228,13 +233,13 @@ static f_pixel get_median(const struct box *b, hist_item achv[])
// technically the second color is not guaranteed to be sorted correctly
// but most of the time it is good enough to be useful
return averagepixels(2, &achv[b->ind + median_start], 1.0, (f_pixel){0.5,0.5,0.5,0.5});
return averagepixels(2, &achv[b->ind + median_start]);
}
/*
** Find the best splittable box. -1 if no boxes are splittable.
*/
static int best_splittable_box(struct box* bv, unsigned int boxes, const double max_mse)
static int best_splittable_box(struct box bv[], unsigned int boxes, const double max_mse)
{
int bi=-1; double maxsum=0;
for(unsigned int i=0; i < boxes; i++) {
@ -261,15 +266,13 @@ static int best_splittable_box(struct box* bv, unsigned int boxes, const double
inline static double color_weight(f_pixel median, hist_item h)
{
float diff = colordifference(median, h.acolor);
// if color is "good enough", don't split further
if (diff < 2.f/256.f/256.f) diff /= 2.f;
return sqrt(diff) * (sqrt(1.0+h.adjusted_weight)-1.0);
}
static void set_colormap_from_boxes(colormap *map, struct box* bv, unsigned int boxes, hist_item *achv);
static void adjust_histogram(hist_item *achv, const colormap *map, const struct box* bv, unsigned int boxes);
static void set_colormap_from_boxes(colormap *map, struct box bv[], unsigned int boxes, hist_item *achv);
static void adjust_histogram(hist_item *achv, const struct box bv[], unsigned int boxes);
double box_error(const struct box *box, const hist_item achv[])
static double box_error(const struct box *box, const hist_item achv[])
{
f_pixel avg = box->color;
@ -306,107 +309,106 @@ static bool total_box_error_below_target(double target_mse, struct box bv[], uns
return true;
}
static void box_init(struct box *box, const hist_item *achv, const unsigned int ind, const unsigned int colors, const double sum) {
box->ind = ind;
box->colors = colors;
box->sum = sum;
box->total_error = -1;
box->color = averagepixels(colors, &achv[ind]);
#pragma omp task if (colors > 5000)
box->variance = box_variance(achv, box);
#pragma omp task if (colors > 8000)
box->max_error = box_max_error(achv, box);
}
/*
** Here is the fun part, the median-cut colormap generator. This is based
** on Paul Heckbert's paper, "Color Image Quantization for Frame Buffer
** Display," SIGGRAPH 1982 Proceedings, page 297.
*/
LIQ_PRIVATE colormap *mediancut(histogram *hist, const float min_opaque_val, unsigned int newcolors, const double target_mse, const double max_mse, void* (*malloc)(size_t), void (*free)(void*))
LIQ_PRIVATE colormap *mediancut(histogram *hist, unsigned int newcolors, const double target_mse, const double max_mse, void* (*malloc)(size_t), void (*free)(void*))
{
hist_item *achv = hist->achv;
struct box bv[newcolors];
LIQ_ARRAY(struct box, bv, newcolors);
unsigned int boxes = 1;
/*
** Set up the initial box.
*/
bv[0].ind = 0;
bv[0].colors = hist->size;
bv[0].color = averagepixels(bv[0].colors, &achv[bv[0].ind], min_opaque_val, (f_pixel){0.5,0.5,0.5,0.5});
bv[0].variance = box_variance(achv, &bv[0]);
bv[0].max_error = box_max_error(achv, &bv[0]);
bv[0].sum = 0;
bv[0].total_error = -1;
for(unsigned int i=0; i < bv[0].colors; i++) bv[0].sum += achv[i].adjusted_weight;
unsigned int boxes = 1;
// remember smaller palette for fast searching
colormap *representative_subset = NULL;
unsigned int subset_size = ceilf(powf(newcolors,0.7f));
/*
** Main loop: split boxes until we have enough.
*/
while (boxes < newcolors) {
if (boxes == subset_size) {
representative_subset = pam_colormap(boxes, malloc, free);
set_colormap_from_boxes(representative_subset, bv, boxes, achv);
#pragma omp parallel
#pragma omp single
{
double sum = 0;
for(unsigned int i=0; i < hist->size; i++) {
sum += achv[i].adjusted_weight;
}
#pragma omp taskgroup
{
box_init(&bv[0], achv, 0, hist->size, sum);
}
// first splits boxes that exceed quality limit (to have colors for things like odd green pixel),
// later raises the limit to allow large smooth areas/gradients get colors.
const double current_max_mse = max_mse + (boxes/(double)newcolors)*16.0*max_mse;
const int bi = best_splittable_box(bv, boxes, current_max_mse);
if (bi < 0)
break; /* ran out of colors! */
unsigned int indx = bv[bi].ind;
unsigned int clrs = bv[bi].colors;
/*
Classic implementation tries to get even number of colors or pixels in each subdivision.
Here, instead of popularity I use (sqrt(popularity)*variance) metric.
Each subdivision balances number of pixels (popular colors) and low variance -
boxes can be large if they have similar colors. Later boxes with high variance
will be more likely to be split.
Median used as expected value gives much better results than mean.
** Main loop: split boxes until we have enough.
*/
while (boxes < newcolors) {
const double halfvar = prepare_sort(&bv[bi], achv);
double lowervar=0;
// first splits boxes that exceed quality limit (to have colors for things like odd green pixel),
// later raises the limit to allow large smooth areas/gradients get colors.
const double current_max_mse = max_mse + (boxes/(double)newcolors)*16.0*max_mse;
const int bi = best_splittable_box(bv, boxes, current_max_mse);
if (bi < 0) {
break; /* ran out of colors! */
}
// hist_item_sort_halfvar sorts and sums lowervar at the same time
// returns item to break at …minus one, which does smell like an off-by-one error.
hist_item *break_p = hist_item_sort_halfvar(&achv[indx], clrs, &lowervar, halfvar);
unsigned int break_at = MIN(clrs-1, break_p - &achv[indx] + 1);
unsigned int indx = bv[bi].ind;
unsigned int clrs = bv[bi].colors;
/*
** Split the box.
*/
double sm = bv[bi].sum;
double lowersum = 0;
for(unsigned int i=0; i < break_at; i++) lowersum += achv[indx + i].adjusted_weight;
/*
Classic implementation tries to get even number of colors or pixels in each subdivision.
const f_pixel previous_center = bv[bi].color;
bv[bi].colors = break_at;
bv[bi].sum = lowersum;
bv[bi].color = averagepixels(bv[bi].colors, &achv[bv[bi].ind], min_opaque_val, previous_center);
bv[bi].total_error = -1;
bv[bi].variance = box_variance(achv, &bv[bi]);
bv[bi].max_error = box_max_error(achv, &bv[bi]);
bv[boxes].ind = indx + break_at;
bv[boxes].colors = clrs - break_at;
bv[boxes].sum = sm - lowersum;
bv[boxes].color = averagepixels(bv[boxes].colors, &achv[bv[boxes].ind], min_opaque_val, previous_center);
bv[boxes].total_error = -1;
bv[boxes].variance = box_variance(achv, &bv[boxes]);
bv[boxes].max_error = box_max_error(achv, &bv[boxes]);
Here, instead of popularity I use (sqrt(popularity)*variance) metric.
Each subdivision balances number of pixels (popular colors) and low variance -
boxes can be large if they have similar colors. Later boxes with high variance
will be more likely to be split.
++boxes;
Median used as expected value gives much better results than mean.
*/
if (total_box_error_below_target(target_mse, bv, boxes, hist)) {
break;
const double halfvar = prepare_sort(&bv[bi], achv);
double lowervar=0;
// hist_item_sort_halfvar sorts and sums lowervar at the same time
// returns item to break at …minus one, which does smell like an off-by-one error.
hist_item *break_p = hist_item_sort_halfvar(&achv[indx], clrs, &lowervar, halfvar);
unsigned int break_at = MIN(clrs-1, break_p - &achv[indx] + 1);
/*
** Split the box.
*/
double sm = bv[bi].sum;
double lowersum = 0;
for(unsigned int i=0; i < break_at; i++) lowersum += achv[indx + i].adjusted_weight;
#pragma omp taskgroup
{
box_init(&bv[bi], achv, indx, break_at, lowersum);
box_init(&bv[boxes], achv, indx + break_at, clrs - break_at, sm - lowersum);
}
++boxes;
if (total_box_error_below_target(target_mse, bv, boxes, hist)) {
break;
}
}
}
colormap *map = pam_colormap(boxes, malloc, free);
set_colormap_from_boxes(map, bv, boxes, achv);
map->subset_palette = representative_subset;
adjust_histogram(achv, map, bv, boxes);
adjust_histogram(achv, bv, boxes);
return map;
}
@ -433,72 +435,37 @@ static void set_colormap_from_boxes(colormap *map, struct box* bv, unsigned int
}
/* increase histogram popularity by difference from the final color (this is used as part of feedback loop) */
static void adjust_histogram(hist_item *achv, const colormap *map, const struct box* bv, unsigned int boxes)
static void adjust_histogram(hist_item *achv, const struct box* bv, unsigned int boxes)
{
for(unsigned int bi = 0; bi < boxes; ++bi) {
for(unsigned int i=bv[bi].ind; i < bv[bi].ind+bv[bi].colors; i++) {
achv[i].adjusted_weight *= sqrt(1.0 +colordifference(map->palette[bi].acolor, achv[i].acolor)/4.0);
achv[i].tmp.likely_colormap_index = bi;
}
}
}
static f_pixel averagepixels(unsigned int clrs, const hist_item achv[], const float min_opaque_val, const f_pixel center)
static f_pixel averagepixels(unsigned int clrs, const hist_item achv[])
{
double r = 0, g = 0, b = 0, a = 0, new_a=0, sum = 0;
float maxa = 0;
double r = 0, g = 0, b = 0, a = 0, sum = 0;
// first find final opacity in order to blend colors at that opacity
for(unsigned int i = 0; i < clrs; ++i) {
#pragma omp parallel for if (clrs > 25000) \
schedule(static) default(shared) reduction(+:a) reduction(+:r) reduction(+:g) reduction(+:b) reduction(+:sum)
for(unsigned int i = 0; i < clrs; i++) {
const f_pixel px = achv[i].acolor;
new_a += px.a * achv[i].adjusted_weight;
sum += achv[i].adjusted_weight;
const double weight = achv[i].adjusted_weight;
/* find if there are opaque colors, in case we're supposed to preserve opacity exactly (ie_bug) */
if (px.a > maxa) maxa = px.a;
}
if (sum) new_a /= sum;
/** if there was at least one completely opaque color, "round" final color to opaque */
if (new_a >= min_opaque_val && maxa >= (255.0/256.0)) new_a = 1;
sum=0;
// reverse iteration for cache locality with previous loop
for(int i = clrs-1; i >= 0; i--) {
double tmp, weight = 1.0f;
f_pixel px = achv[i].acolor;
/* give more weight to colors that are further away from average
this is intended to prevent desaturation of images and fading of whites
*/
tmp = (center.r - px.r);
weight += tmp*tmp;
tmp = (center.g - px.g);
weight += tmp*tmp;
tmp = (center.b - px.b);
weight += tmp*tmp;
weight *= achv[i].adjusted_weight;
sum += weight;
if (px.a) {
px.r /= px.a;
px.g /= px.a;
px.b /= px.a;
}
r += px.r * new_a * weight;
g += px.g * new_a * weight;
b += px.b * new_a * weight;
a += new_a * weight;
a += px.a * weight;
r += px.r * weight;
g += px.g * weight;
b += px.b * weight;
}
if (sum) {
a /= sum;
r /= sum;
g /= sum;
b /= sum;
a /= sum;
r /= sum;
g /= sum;
b /= sum;
}
assert(!isnan(r) && !isnan(g) && !isnan(b) && !isnan(a));

View File

@ -1,2 +1,2 @@
LIQ_PRIVATE colormap *mediancut(histogram *hist, const float min_opaque_val, unsigned int newcolors, const double target_mse, const double max_mse, void* (*malloc)(size_t), void (*free)(void*));
LIQ_PRIVATE colormap *mediancut(histogram *hist, unsigned int newcolors, const double target_mse, const double max_mse, void* (*malloc)(size_t), void (*free)(void*));

View File

@ -1,3 +1,10 @@
/*
** © 2009-2017 by Kornel Lesiński.
** © 1989, 1991 by Jef Poskanzer.
** © 1997, 2000, 2002 by Greg Roelofs; based on an idea by Stefan Schneider.
**
** See COPYRIGHT file for license.
*/
#include "libimagequant.h"
#include "mempool.h"
@ -14,7 +21,7 @@ struct mempool {
void (*free)(void*);
struct mempool *next;
};
LIQ_PRIVATE void* mempool_create(mempool *mptr, const unsigned int size, unsigned int max_size, void* (*malloc)(size_t), void (*free)(void*))
LIQ_PRIVATE void* mempool_create(mempoolptr *mptr, const unsigned int size, unsigned int max_size, void* (*malloc)(size_t), void (*free)(void*))
{
if (*mptr && ((*mptr)->used+size) <= (*mptr)->size) {
unsigned int prevused = (*mptr)->used;
@ -22,7 +29,7 @@ LIQ_PRIVATE void* mempool_create(mempool *mptr, const unsigned int size, unsigne
return ((char*)(*mptr)) + prevused;
}
mempool old = *mptr;
mempoolptr old = *mptr;
if (!max_size) max_size = (1<<17);
max_size = size+ALIGN_MASK > max_size ? size+ALIGN_MASK : max_size;
@ -42,7 +49,7 @@ LIQ_PRIVATE void* mempool_create(mempool *mptr, const unsigned int size, unsigne
return mempool_alloc(mptr, size, size);
}
LIQ_PRIVATE void* mempool_alloc(mempool *mptr, unsigned int size, unsigned int max_size)
LIQ_PRIVATE void* mempool_alloc(mempoolptr *mptr, const unsigned int size, const unsigned int max_size)
{
if (((*mptr)->used+size) <= (*mptr)->size) {
unsigned int prevused = (*mptr)->used;
@ -53,10 +60,10 @@ LIQ_PRIVATE void* mempool_alloc(mempool *mptr, unsigned int size, unsigned int m
return mempool_create(mptr, size, max_size, (*mptr)->malloc, (*mptr)->free);
}
LIQ_PRIVATE void mempool_destroy(mempool m)
LIQ_PRIVATE void mempool_destroy(mempoolptr m)
{
while (m) {
mempool next = m->next;
mempoolptr next = m->next;
m->free(m);
m = next;
}

View File

@ -4,10 +4,10 @@
#include <stddef.h>
struct mempool;
typedef struct mempool *mempool;
typedef struct mempool *mempoolptr;
LIQ_PRIVATE void* mempool_create(mempool *mptr, unsigned int size, unsigned int capacity, void* (*malloc)(size_t), void (*free)(void*));
LIQ_PRIVATE void* mempool_alloc(mempool *mptr, unsigned int size, unsigned int capacity);
LIQ_PRIVATE void mempool_destroy(mempool m);
LIQ_PRIVATE void* mempool_create(mempoolptr *mptr, const unsigned int size, unsigned int capacity, void* (*malloc)(size_t), void (*free)(void*));
LIQ_PRIVATE void* mempool_alloc(mempoolptr *mptr, const unsigned int size, const unsigned int capacity);
LIQ_PRIVATE void mempool_destroy(mempoolptr m);
#endif

View File

@ -1,3 +1,10 @@
/*
** © 2009-2015 by Kornel Lesiński.
** © 1989, 1991 by Jef Poskanzer.
** © 1997, 2000, 2002 by Greg Roelofs; based on an idea by Stefan Schneider.
**
** See COPYRIGHT file for license.
*/
#include "libimagequant.h"
#include "pam.h"
@ -5,234 +12,181 @@
#include "mempool.h"
#include <stdlib.h>
struct sorttmp {
float radius;
unsigned int index;
};
typedef struct vp_sort_tmp {
float distance_squared;
unsigned int idx;
} vp_sort_tmp;
struct head {
// colors less than radius away from vantage_point color will have best match in candidates
typedef struct vp_search_tmp {
float distance;
unsigned int idx;
int exclude;
} vp_search_tmp;
typedef struct vp_node {
struct vp_node *near, *far;
f_pixel vantage_point;
float radius;
unsigned int num_candidates;
f_pixel *candidates_color;
unsigned short *candidates_index;
};
unsigned int idx;
} vp_node;
struct nearest_map {
const colormap *map;
vp_node *root;
const colormap_item *palette;
float nearest_other_color_dist[256];
mempool mempool;
struct head heads[];
mempoolptr mempool;
};
static unsigned int find_slow(const f_pixel px, const colormap *map)
{
unsigned int best=0;
float bestdiff = colordifference(px, map->palette[0].acolor);
static void vp_search_node(const vp_node *node, const f_pixel *const needle, vp_search_tmp *const best_candidate);
for(unsigned int i=1; i < map->colors; i++) {
float diff = colordifference(px, map->palette[i].acolor);
if (diff < bestdiff) {
static int vp_compare_distance(const void *ap, const void *bp) {
float a = ((const vp_sort_tmp*)ap)->distance_squared;
float b = ((const vp_sort_tmp*)bp)->distance_squared;
return a > b ? 1 : -1;
}
static void vp_sort_indexes_by_distance(const f_pixel vantage_point, vp_sort_tmp indexes[], int num_indexes, const colormap_item items[]) {
for(int i=0; i < num_indexes; i++) {
indexes[i].distance_squared = colordifference(vantage_point, items[indexes[i].idx].acolor);
}
qsort(indexes, num_indexes, sizeof(indexes[0]), vp_compare_distance);
}
/*
* Usually it should pick farthest point, but picking most popular point seems to make search quicker anyway
*/
static int vp_find_best_vantage_point_index(vp_sort_tmp indexes[], int num_indexes, const colormap_item items[]) {
int best = 0;
float best_popularity = items[indexes[0].idx].popularity;
for(int i = 1; i < num_indexes; i++) {
if (items[indexes[i].idx].popularity > best_popularity) {
best_popularity = items[indexes[i].idx].popularity;
best = i;
bestdiff = diff;
}
}
return best;
}
static float distance_from_nearest_other_color(const colormap *map, const unsigned int i)
{
float second_best=MAX_DIFF;
for(unsigned int j=0; j < map->colors; j++) {
if (i == j) continue;
float diff = colordifference(map->palette[i].acolor, map->palette[j].acolor);
if (diff <= second_best) {
second_best = diff;
}
static vp_node *vp_create_node(mempoolptr *m, vp_sort_tmp indexes[], int num_indexes, const colormap_item items[]) {
if (num_indexes <= 0) {
return NULL;
}
return second_best;
vp_node *node = mempool_alloc(m, sizeof(node[0]), 0);
if (num_indexes == 1) {
*node = (vp_node){
.vantage_point = items[indexes[0].idx].acolor,
.idx = indexes[0].idx,
.radius = MAX_DIFF,
};
return node;
}
const int ref = vp_find_best_vantage_point_index(indexes, num_indexes, items);
const int ref_idx = indexes[ref].idx;
// Removes the `ref_idx` item from remaining items, because it's included in the current node
num_indexes -= 1;
indexes[ref] = indexes[num_indexes];
vp_sort_indexes_by_distance(items[ref_idx].acolor, indexes, num_indexes, items);
// Remaining items are split by the median distance
const int half_idx = num_indexes/2;
*node = (vp_node){
.vantage_point = items[ref_idx].acolor,
.idx = ref_idx,
.radius = sqrtf(indexes[half_idx].distance_squared),
};
node->near = vp_create_node(m, indexes, half_idx, items);
node->far = vp_create_node(m, &indexes[half_idx], num_indexes - half_idx, items);
return node;
}
static int compareradius(const void *ap, const void *bp)
{
float a = ((const struct sorttmp*)ap)->radius;
float b = ((const struct sorttmp*)bp)->radius;
return a > b ? 1 : (a < b ? -1 : 0);
}
LIQ_PRIVATE struct nearest_map *nearest_init(const colormap *map) {
mempoolptr m = NULL;
struct nearest_map *handle = mempool_create(&m, sizeof(handle[0]), sizeof(handle[0]) + sizeof(vp_node)*map->colors+16, map->malloc, map->free);
static struct head build_head(f_pixel px, const colormap *map, unsigned int num_candidates, mempool *m, float error_margin, bool skip_index[], unsigned int *skipped)
{
struct sorttmp colors[map->colors];
unsigned int colorsused=0;
LIQ_ARRAY(vp_sort_tmp, indexes, map->colors);
for(unsigned int i=0; i < map->colors; i++) {
if (skip_index[i]) continue; // colors in skip_index have been eliminated already in previous heads
colors[colorsused].index = i;
colors[colorsused].radius = colordifference(px, map->palette[i].acolor);
colorsused++;
indexes[i].idx = i;
}
qsort(&colors, colorsused, sizeof(colors[0]), compareradius);
assert(colorsused < 2 || colors[0].radius <= colors[1].radius); // closest first
num_candidates = MIN(colorsused, num_candidates);
struct head h = {
.candidates_color = mempool_alloc(m, num_candidates * sizeof(h.candidates_color[0]), 0),
.candidates_index = mempool_alloc(m, num_candidates * sizeof(h.candidates_index[0]), 0),
.vantage_point = px,
.num_candidates = num_candidates,
vp_node *root = vp_create_node(&m, indexes, map->colors, map->palette);
*handle = (struct nearest_map){
.root = root,
.palette = map->palette,
.mempool = m,
};
for(unsigned int i=0; i < num_candidates; i++) {
h.candidates_color[i] = map->palette[colors[i].index].acolor;
h.candidates_index[i] = colors[i].index;
}
// if all colors within this radius are included in candidates, then there cannot be any other better match
// farther away from the vantage point than half of the radius. Due to alpha channel must assume pessimistic radius.
h.radius = min_colordifference(px, h.candidates_color[num_candidates-1])/4.0f; // /4 = half of radius, but radius is squared
for(unsigned int i=0; i < num_candidates; i++) {
// divide again as that's matching certain subset within radius-limited subset
// - 1/256 is a tolerance for miscalculation (seems like colordifference isn't exact)
if (colors[i].radius < h.radius/4.f - error_margin) {
skip_index[colors[i].index]=true;
(*skipped)++;
}
}
return h;
}
static colormap *get_subset_palette(const colormap *map)
{
if (map->subset_palette) {
return map->subset_palette;
}
unsigned int subset_size = (map->colors+3)/4;
colormap *subset_palette = pam_colormap(subset_size, map->malloc, map->free);
for(unsigned int i=0; i < subset_size; i++) {
subset_palette->palette[i] = map->palette[i];
}
return subset_palette;
}
LIQ_PRIVATE struct nearest_map *nearest_init(const colormap *map, bool fast)
{
colormap *subset_palette = get_subset_palette(map);
const unsigned int num_vantage_points = map->colors > 16 ? MIN(map->colors/4, subset_palette->colors) : 0;
const unsigned long heads_size = sizeof(struct head) * (num_vantage_points+1); // +1 is fallback head
const unsigned long mempool_size = (sizeof(f_pixel) + sizeof(unsigned int)) * subset_palette->colors * map->colors/5 + (1<<14);
mempool m = NULL;
struct nearest_map *centroids = mempool_create(&m, sizeof(*centroids) + heads_size /* heads array is appended to it */, mempool_size, map->malloc, map->free);
centroids->mempool = m;
for(unsigned int i=0; i < map->colors; i++) {
const float dist = distance_from_nearest_other_color(map,i);
centroids->nearest_other_color_dist[i] = dist / 4.f; // half of squared distance
vp_search_tmp best = {
.distance = MAX_DIFF,
.exclude = i,
};
vp_search_node(root, &map->palette[i].acolor, &best);
handle->nearest_other_color_dist[i] = best.distance * best.distance / 4.0; // half of squared distance
}
centroids->map = map;
unsigned int skipped=0;
assert(map->colors > 0);
bool skip_index[map->colors]; for(unsigned int j=0; j < map->colors; j++) skip_index[j]=false;
// floats and colordifference calculations are not perfect
const float error_margin = fast ? 0 : 8.f/256.f/256.f;
unsigned int h=0;
for(; h < num_vantage_points; h++) {
unsigned int num_candiadtes = 1+(map->colors - skipped)/((1+num_vantage_points-h)/2);
centroids->heads[h] = build_head(subset_palette->palette[h].acolor, map, num_candiadtes, &centroids->mempool, error_margin, skip_index, &skipped);
if (centroids->heads[h].num_candidates == 0) {
break;
}
}
// assumption that there is no better color within radius of vantage point color
// holds true only for colors within convex hull formed by palette colors.
// since finding proper convex hull is more than a few lines, this
// is a cheap shot at finding just few key points.
const f_pixel extrema[] = {
{.a=0,0,0,0},
{.a=.5,0,0,0}, {.a=.5,1,0,0},
{.a=.5,0,0,1}, {.a=.5,1,0,1},
{.a=.5,0,1,0}, {.a=.5,1,1,0},
{.a=.5,0,1,1}, {.a=.5,1,1,1},
{.a=1,0,0,0}, {.a=1,1,0,0},
{.a=1,0,0,1}, {.a=1,1,0,1},
{.a=1,0,1,0}, {.a=1,1,1,0},
{.a=1,0,1,1}, {.a=1,1,1,1},
{.a=1,.5, 0, 0}, {.a=1, 0,.5, 0}, {.a=1, 0, 0, .5},
{.a=1,.5, 0, 1}, {.a=1, 0,.5, 1}, {.a=1, 0, 1, .5},
{.a=1,.5, 1, 0}, {.a=1, 1,.5, 0}, {.a=1, 1, 0, .5},
{.a=1,.5, 1, 1}, {.a=1, 1,.5, 1}, {.a=1, 1, 1, .5},
};
for(unsigned int i=0; i < sizeof(extrema)/sizeof(extrema[0]); i++) {
skip_index[find_slow(extrema[i], map)]=0;
}
centroids->heads[h] = build_head((f_pixel){0,0,0,0}, map, map->colors, &centroids->mempool, error_margin, skip_index, &skipped);
centroids->heads[h].radius = MAX_DIFF;
// get_subset_palette could have created a copy
if (subset_palette != map->subset_palette) {
pam_freecolormap(subset_palette);
}
return centroids;
return handle;
}
LIQ_PRIVATE unsigned int nearest_search(const struct nearest_map *centroids, const f_pixel px, int likely_colormap_index, const float min_opaque_val, float *diff)
{
const bool iebug = px.a > min_opaque_val;
static void vp_search_node(const vp_node *node, const f_pixel *const needle, vp_search_tmp *const best_candidate) {
do {
const float distance = sqrtf(colordifference(node->vantage_point, *needle));
const struct head *const heads = centroids->heads;
if (distance < best_candidate->distance && best_candidate->exclude != node->idx) {
best_candidate->distance = distance;
best_candidate->idx = node->idx;
}
assert(likely_colormap_index < centroids->map->colors);
const float guess_diff = colordifference(centroids->map->palette[likely_colormap_index].acolor, px);
if (guess_diff < centroids->nearest_other_color_dist[likely_colormap_index]) {
// Recurse towards most likely candidate first to narrow best candidate's distance as soon as possible
if (distance < node->radius) {
if (node->near) {
vp_search_node(node->near, needle, best_candidate);
}
// The best node (final answer) may be just ouside the radius, but not farther than
// the best distance we know so far. The vp_search_node above should have narrowed
// best_candidate->distance, so this path is rarely taken.
if (node->far && distance >= node->radius - best_candidate->distance) {
node = node->far; // Fast tail recursion
} else {
break;
}
} else {
if (node->far) {
vp_search_node(node->far, needle, best_candidate);
}
if (node->near && distance <= node->radius + best_candidate->distance) {
node = node->near; // Fast tail recursion
} else {
break;
}
}
} while(true);
}
LIQ_PRIVATE unsigned int nearest_search(const struct nearest_map *handle, const f_pixel *px, const int likely_colormap_index, float *diff) {
const float guess_diff = colordifference(handle->palette[likely_colormap_index].acolor, *px);
if (guess_diff < handle->nearest_other_color_dist[likely_colormap_index]) {
if (diff) *diff = guess_diff;
return likely_colormap_index;
}
for(unsigned int i=0; /* last head will always be selected */ ; i++) {
float vantage_point_dist = colordifference(px, heads[i].vantage_point);
if (vantage_point_dist <= heads[i].radius) {
assert(heads[i].num_candidates);
unsigned int ind=0;
float dist = colordifference(px, heads[i].candidates_color[0]);
/* penalty for making holes in IE */
if (iebug && heads[i].candidates_color[0].a < 1) {
dist += 1.f/1024.f;
}
for(unsigned int j=1; j < heads[i].num_candidates; j++) {
float newdist = colordifference(px, heads[i].candidates_color[j]);
/* penalty for making holes in IE */
if (iebug && heads[i].candidates_color[j].a < 1) {
newdist += 1.f/1024.f;
}
if (newdist < dist) {
dist = newdist;
ind = j;
}
}
if (diff) *diff = dist;
return heads[i].candidates_index[ind];
}
vp_search_tmp best_candidate = {
.distance = sqrtf(guess_diff),
.idx = likely_colormap_index,
.exclude = -1,
};
vp_search_node(handle->root, px, &best_candidate);
if (diff) {
*diff = best_candidate.distance * best_candidate.distance;
}
return best_candidate.idx;
}
LIQ_PRIVATE void nearest_free(struct nearest_map *centroids)

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@ -3,6 +3,6 @@
// pngquant
//
struct nearest_map;
LIQ_PRIVATE struct nearest_map *nearest_init(const colormap *palette, const bool fast);
LIQ_PRIVATE unsigned int nearest_search(const struct nearest_map *map, const f_pixel px, const int palette_index_guess, const float min_opaque, float *diff);
LIQ_PRIVATE struct nearest_map *nearest_init(const colormap *palette);
LIQ_PRIVATE unsigned int nearest_search(const struct nearest_map *map, const f_pixel *px, const int palette_index_guess, float *diff);
LIQ_PRIVATE void nearest_free(struct nearest_map *map);

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@ -0,0 +1,74 @@
package org.pngquant;
import org.pngquant.*;
import java.awt.image.*;
/**
* PngQuant's representation of an Image constructed from BufferedImage.
*/
public class Image extends LiqObject {
/**
* Converts BufferedImage to internal representation (pixel data is copied).
* It's best to use BufferedImage in RGB/RGBA format backed by DataBufferByte.
* Throws if conversion fails.
*/
public Image(BufferedImage image) throws PngQuantException {
this(new PngQuant(), image);
}
public Image(PngQuant attr, BufferedImage image) throws PngQuantException {
handle = handleFromImage(attr, image);
if (handle == 0) {
BufferedImage converted = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);
converted.getGraphics().drawImage(image, 0, 0, null);
handle = handleFromImage(attr, converted);
if (handle == 0) {
throw new PngQuantException();
}
}
}
/**
* Guarantees presence of the given color in the palette (subject to setMaxColors())
* if this image is used for quantization.
*/
public native boolean addFixedColor(int r, int g, int b, int a);
public boolean addFixedColor(int r, int g, int b) {
return addFixedColor(r, g, b, 255);
}
public native int getWidth();
public native int getHeight();
public void close() {
if (handle != 0) {
liq_image_destroy(handle);
handle = 0;
}
}
private static long handleFromImage(PngQuant attr, BufferedImage image) {
// The JNI wrapper will accept non-premultiplied ABGR and BGR only.
int type = image.getType();
if (type != BufferedImage.TYPE_3BYTE_BGR &&
type != BufferedImage.TYPE_4BYTE_ABGR &&
type != BufferedImage.TYPE_4BYTE_ABGR_PRE) return 0;
WritableRaster raster = image.getRaster();
ColorModel color = image.getColorModel();
if (type == BufferedImage.TYPE_4BYTE_ABGR_PRE) color.coerceData(raster, false);
DataBuffer buffer = raster.getDataBuffer();
if (buffer instanceof DataBufferByte) {
byte[] imageData = ((DataBufferByte)buffer).getData();
return liq_image_create(attr.handle, imageData,
raster.getWidth(), raster.getHeight(), color.getNumComponents());
}
return 0;
}
private static native long liq_image_create(long attr, byte[] bitmap, int width, int height, int components);
private static native void liq_image_destroy(long handle);
}

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@ -0,0 +1,19 @@
package org.pngquant;
abstract class LiqObject {
static {
// libimagequant.jnilib or libimagequant.so must be in java.library.path
System.loadLibrary("imagequant");
}
long handle;
/**
* Free memory used by the library. The object must not be used after this call.
*/
abstract public void close();
protected void finalize() throws Throwable {
close();
}
}

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@ -0,0 +1,156 @@
#include "org/pngquant/PngQuant.h"
#include "org/pngquant/Image.h"
#include "org/pngquant/Result.h"
#include "libimagequant.h"
#include <stdlib.h>
typedef struct {
liq_image *image;
jbyte *data;
} liq_jni_image;
static void *handle(JNIEnv *env, jobject obj) {
jlong h = (*env)->GetLongField(env, obj, (*env)->GetFieldID(env, (*env)->GetObjectClass(env, obj), "handle", "J"));
return (void*)h;
}
JNIEXPORT jlong JNICALL Java_org_pngquant_PngQuant_liq_1attr_1create(JNIEnv *env, jclass class) {
return (jlong)liq_attr_create();
}
JNIEXPORT jlong JNICALL Java_org_pngquant_PngQuant_liq_1attr_1copy(JNIEnv *env, jclass class, jlong attr) {
return (jlong)liq_attr_copy((liq_attr*)attr);
}
JNIEXPORT void JNICALL Java_org_pngquant_PngQuant_liq_1attr_1destroy(JNIEnv *env, jclass class, jlong attr) {
return liq_attr_destroy((liq_attr*)attr);
}
JNIEXPORT jboolean JNICALL Java_org_pngquant_PngQuant_setMaxColors(JNIEnv *env, jobject obj, jint colors) {
return LIQ_OK == liq_set_max_colors(handle(env, obj), colors);
}
JNIEXPORT jboolean JNICALL Java_org_pngquant_PngQuant_setSpeed(JNIEnv *env, jobject obj, jint speed) {
return LIQ_OK == liq_set_speed(handle(env, obj), speed);
}
JNIEXPORT jboolean JNICALL Java_org_pngquant_PngQuant_setMinPosterization(JNIEnv *env, jobject obj, jint p) {
return LIQ_OK == liq_set_min_posterization(handle(env, obj), p);
}
JNIEXPORT jboolean JNICALL Java_org_pngquant_PngQuant_setQuality__I(JNIEnv *env, jobject obj, jint q) {
return LIQ_OK == liq_set_quality(handle(env, obj), q/2, q);
}
JNIEXPORT jboolean JNICALL Java_org_pngquant_PngQuant_setQuality__II(JNIEnv *env, jobject obj, jint qmin, jint qmax) {
return LIQ_OK == liq_set_quality(handle(env, obj), qmin, qmax);
}
static void convert_abgr(liq_color row_out[], int row_index, int width, void* user_info) {
liq_jni_image *jniimg = user_info;
int column_index;
for(column_index=0; column_index < width; column_index++) {
row_out[column_index].r = jniimg->data[4*(width*row_index + column_index) + 3];
row_out[column_index].g = jniimg->data[4*(width*row_index + column_index) + 2];
row_out[column_index].b = jniimg->data[4*(width*row_index + column_index) + 1];
row_out[column_index].a = jniimg->data[4*(width*row_index + column_index) + 0];
}
}
static void convert_bgr(liq_color row_out[], int row_index, int width, void* user_info) {
liq_jni_image *jniimg = user_info;
int column_index;
for(column_index=0; column_index < width; column_index++) {
row_out[column_index].r = jniimg->data[3*(width*row_index + column_index) + 2];
row_out[column_index].g = jniimg->data[3*(width*row_index + column_index) + 1];
row_out[column_index].b = jniimg->data[3*(width*row_index + column_index) + 0];
row_out[column_index].a = 255;
}
}
JNIEXPORT jlong JNICALL Java_org_pngquant_Image_liq_1image_1create(JNIEnv *env, jclass class, jlong attr, jbyteArray bytearray, jint w, jint h, jint components) {
/* liq_image needs to be wrapped to keep track of allocated buffer */
liq_jni_image *jniimg = malloc(sizeof(liq_jni_image));
/* copying buffer, since ReleaseByteArrayElements was crashing when called from finalize() */
jsize size = (*env)->GetArrayLength(env, bytearray);
jniimg->data = malloc(size);
(*env)->GetByteArrayRegion(env, bytearray, 0, size, jniimg->data);
jniimg->image = liq_image_create_custom((liq_attr*)attr, components == 4 ? convert_abgr : convert_bgr, jniimg, w, h, 0);
if (!jniimg->image) {
free(jniimg->data);
free(jniimg);
return 0;
}
return (jlong)jniimg;
}
JNIEXPORT jboolean JNICALL Java_org_pngquant_Image_addFixedColor(JNIEnv *env, jobject obj, jint r, jint g, jint b, jint a) {
liq_color c = {r,g,b,a};
return LIQ_OK == liq_image_add_fixed_color(((liq_jni_image*)handle(env,obj))->image, c);
}
JNIEXPORT jint JNICALL Java_org_pngquant_Image_getWidth(JNIEnv *env, jobject obj) {
return liq_image_get_width(((liq_jni_image*)handle(env,obj))->image);
}
JNIEXPORT jint JNICALL Java_org_pngquant_Image_getHeight(JNIEnv *env, jobject obj) {
return liq_image_get_height(((liq_jni_image*)handle(env,obj))->image);
}
JNIEXPORT void JNICALL Java_org_pngquant_Image_liq_1image_1destroy(JNIEnv *env, jclass class, jlong handle) {
liq_jni_image *jniimg = (liq_jni_image*)handle;
liq_image_destroy(jniimg->image);
free(jniimg->data);
free(jniimg);
}
JNIEXPORT jlong JNICALL Java_org_pngquant_Result_liq_1quantize_1image(JNIEnv *env, jclass class, jlong attr, jlong handle) {
return (jlong)liq_quantize_image((liq_attr*)attr, ((liq_jni_image*)handle)->image);
}
JNIEXPORT jboolean JNICALL Java_org_pngquant_Result_setDitheringLevel(JNIEnv *env, jobject obj, jfloat l) {
return LIQ_OK == liq_set_dithering_level(handle(env, obj), l);
}
JNIEXPORT jboolean JNICALL Java_org_pngquant_Result_setGamma(JNIEnv *env, jobject obj, jdouble gamma) {
return LIQ_OK == liq_set_output_gamma(handle(env, obj), gamma);
}
JNIEXPORT jdouble JNICALL Java_org_pngquant_Result_getGamma(JNIEnv *env, jobject obj) {
return liq_get_output_gamma(handle(env, obj));
}
JNIEXPORT jboolean JNICALL Java_org_pngquant_Result_liq_1write_1remapped_1image(JNIEnv *env, jclass class, jlong result, jlong image_handle, jbyteArray bytearray) {
jsize size = (*env)->GetArrayLength(env, bytearray);
jbyte *bitmap = (*env)->GetByteArrayElements(env, bytearray, 0);
liq_error err = liq_write_remapped_image((liq_result*)result, ((liq_jni_image*)image_handle)->image, bitmap, size);
(*env)->ReleaseByteArrayElements(env, bytearray, bitmap, 0);
return LIQ_OK == err;
}
JNIEXPORT jdouble JNICALL Java_org_pngquant_Result_getMeanSquareError(JNIEnv *env, jobject obj) {
return liq_get_quantization_error(handle(env, obj));
}
JNIEXPORT jint JNICALL Java_org_pngquant_Result_getQuality(JNIEnv *env, jobject obj) {
return liq_get_quantization_quality(handle(env, obj));
}
JNIEXPORT void JNICALL Java_org_pngquant_Result_liq_1result_1destroy(JNIEnv *env, jclass class, jlong result) {
return liq_result_destroy((liq_result*)result);
}
JNIEXPORT jbyteArray JNICALL Java_org_pngquant_Result_liq_1get_1palette(JNIEnv *env, jclass class, jlong result) {
const liq_palette *pal = liq_get_palette((liq_result*)result);
jbyteArray arr = (*env)->NewByteArray(env, pal->count * 4);
int i;
for(i=0; i < pal->count; i++) {
(*env)->SetByteArrayRegion(env, arr, i*4, 4, ((jbyte*)&pal->entries[i]));
}
return arr;
}

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@ -0,0 +1,111 @@
package org.pngquant;
import org.pngquant.*;
import java.awt.image.*;
/**
* Starting point for the library. Holds configuration. Equivalent of liq_attr* in libimagequant.
*/
public class PngQuant extends LiqObject {
/**
* Single instance can be "recycled" for many remappings.
*/
public PngQuant() {
handle = liq_attr_create();
}
public PngQuant(PngQuant other) {
handle = liq_attr_copy(other.handle);
}
/**
* 1-shot quantization and remapping with current settings.
* @see quantize()
*
* @return 8-bit indexed image or null on failure
*/
public BufferedImage getRemapped(BufferedImage bufimg) {
try {
Image liqimg = new Image(this, bufimg);
BufferedImage remapped = getRemapped(liqimg);
liqimg.close();
return remapped;
} catch(PngQuantException e) {
return null;
}
}
/** @return remapped image or null on failure */
public BufferedImage getRemapped(Image liqimg) {
Result result = quantize(liqimg);
if (result == null) return null;
BufferedImage remapped = result.getRemapped(liqimg);
result.close();
return remapped;
}
/**
* Performs quantization (chooses optimal palette for the given Image).
* Returned object can be used to customize remapping and reused to remap other images to the same palette.
* @link http://pngquant.org/lib/#liq_quantize_image
*
* @return null on failure
*/
public Result quantize(Image img) {
try {
return new Result(this, img);
} catch(PngQuantException e) {
return null;
}
}
/**
* Remapped images won't use more than given number of colors (may use less if setQuality() is used)
*
* @link http://pngquant.org/lib/#liq_set_max_colors
*/
public native boolean setMaxColors(int colors);
/**
* Equivalent of setQuality(target/2, target)
*
* @link http://pngquant.org/lib/#liq_set_quality
*/
public native boolean setQuality(int target);
/**
* Quality in range 0-100. Quantization will fail if minimum quality cannot
* be achieved with given number of colors.
*
* @link http://pngquant.org/lib/#liq_set_quality
*/
public native boolean setQuality(int min, int max);
/**
* Speed in range 1 (slowest) and 11 (fastest). 3 is the optimum.
* Higher speeds quantize quicker, but at cost of quality and sometimes larger images.
*
* @link http://pngquant.org/lib/#liq_set_speed
*/
public native boolean setSpeed(int speed);
/**
* Reduces color precision by truncating number of least significant bits.
* Slightly improves speed and helps generating images for low-fidelity displays/textures.
*
* @link http://pngquant.org/lib/#liq_set_min_posterization
*/
public native boolean setMinPosterization(int bits);
public void close() {
if (handle != 0) {
liq_attr_destroy(handle);
handle = 0;
}
}
private static native long liq_attr_create();
private static native long liq_attr_copy(long orig);
private static native void liq_attr_destroy(long handle);
}

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@ -0,0 +1,4 @@
package org.pngquant;
public class PngQuantException extends Exception {
}

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@ -0,0 +1,90 @@
package org.pngquant;
import org.pngquant.*;
import java.awt.image.*;
/**
* Quantization result that holds palette and options for remapping.
*/
public class Result extends LiqObject {
/**
* Throws when quantization fails (e.g. due to failing to achieve minimum quality)
*/
public Result(PngQuant pngquant, Image image) throws PngQuantException {
handle = liq_quantize_image(pngquant.handle, image.handle);
if (handle == 0) {
throw new PngQuantException();
}
}
/**
* @return BufferedImage remapped to palette this Result has been created with or null on failure.
*/
public BufferedImage getRemapped(Image orig_image) {
byte[] pal = liq_get_palette(handle);
IndexColorModel color = new IndexColorModel(8, pal.length/4, pal, 0, true);
BufferedImage img = new BufferedImage(
orig_image.getWidth(), orig_image.getHeight(),
BufferedImage.TYPE_BYTE_INDEXED, color);
byte[] data = get8bitDataFromImage(img);
if (data == null) return null;
if (!liq_write_remapped_image(handle, orig_image.handle, data)) return null;
return img;
}
/**
* Dithering strength. Floyd-Steinberg is always used and in
* speed settings 1-5 high-quality adaptive dithering is used.
* @see PngQuant.setSpeed()
* @link http://pngquant.org/lib/#liq_set_dithering_level
*
* @param dither_level Dithering in range 0 (none) and 1 (full)
*/
public native boolean setDitheringLevel(float dither_level);
/**
* The default is 0.45455 (1/2.2) which is PNG's approximation of sRGB.
*/
public native boolean setGamma(double gamma);
public native double getGamma();
/**
* Mean Square Error of remapping of image used to create this result.
* @link http://pngquant.org/lib/#liq_get_quantization_error
*
* @return MSE or -1 if not available
*/
public native double getMeanSquareError();
/**
* @link http://pngquant.org/lib/#liq_get_quantization_quality
* @return Actually achieved quality in 0-100 range on scale compatible with PngQuant.setQuality()
*/
public native int getQuality();
public void close() {
if (handle != 0) {
liq_result_destroy(handle);
handle = 0;
}
}
private static byte[] get8bitDataFromImage(BufferedImage image) {
if (image.getType() == BufferedImage.TYPE_BYTE_INDEXED) {
DataBuffer buffer = image.getRaster().getDataBuffer();
if (buffer instanceof DataBufferByte) {
return ((DataBufferByte)buffer).getData();
}
}
return null;
}
private static native byte[] liq_get_palette(long handle);
private static native long liq_quantize_image(long attr, long image);
private static native boolean liq_write_remapped_image(long handle, long image, byte[] buffer);
private static native void liq_result_destroy(long handle);
}

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@ -1,16 +1,10 @@
/* pam.c - pam (portable alpha map) utility library
**
** Copyright (C) 1989, 1991 by Jef Poskanzer.
** Copyright (C) 1997, 2000, 2002 by Greg Roelofs; based on an idea by
** Stefan Schneider.
** © 2009-2013 by Kornel Lesinski.
** © 2009-2017 by Kornel Lesiński.
** © 1989, 1991 by Jef Poskanzer.
** © 1997, 2000, 2002 by Greg Roelofs; based on an idea by Stefan Schneider.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
** See COPYRIGHT file for license.
*/
#include <stdlib.h>
@ -22,28 +16,19 @@
LIQ_PRIVATE bool pam_computeacolorhash(struct acolorhash_table *acht, const rgba_pixel *const pixels[], unsigned int cols, unsigned int rows, const unsigned char *importance_map)
{
const unsigned int maxacolors = acht->maxcolors, ignorebits = acht->ignorebits;
const unsigned int ignorebits = acht->ignorebits;
const unsigned int channel_mask = 255U>>ignorebits<<ignorebits;
const unsigned int channel_hmask = (255U>>ignorebits) ^ 0xFFU;
const unsigned int posterize_mask = channel_mask << 24 | channel_mask << 16 | channel_mask << 8 | channel_mask;
const unsigned int posterize_high_mask = channel_hmask << 24 | channel_hmask << 16 | channel_hmask << 8 | channel_hmask;
struct acolorhist_arr_head *const buckets = acht->buckets;
unsigned int colors = acht->colors;
const unsigned int hash_size = acht->hash_size;
const unsigned int stacksize = sizeof(acht->freestack)/sizeof(acht->freestack[0]);
struct acolorhist_arr_item **freestack = acht->freestack;
unsigned int freestackp=acht->freestackp;
/* Go through the entire image, building a hash table of colors. */
for(unsigned int row = 0; row < rows; ++row) {
float boost=1.0;
for(unsigned int col = 0; col < cols; ++col) {
if (importance_map) {
boost = 0.5f+ (double)*importance_map++/255.f;
}
unsigned int boost;
// RGBA color is casted to long for easier hasing/comparisons
union rgba_as_int px = {pixels[row][col]};
@ -51,26 +36,50 @@ LIQ_PRIVATE bool pam_computeacolorhash(struct acolorhash_table *acht, const rgba
if (!px.rgba.a) {
// "dirty alpha" has different RGBA values that end up being the same fully transparent color
px.l=0; hash=0;
boost = 2000;
if (importance_map) {
importance_map++;
}
} else {
// mask posterizes all 4 channels in one go
px.l = (px.l & posterize_mask) | ((px.l & posterize_high_mask) >> (8-ignorebits));
// fancier hashing algorithms didn't improve much
hash = px.l % hash_size;
if (importance_map) {
boost = *importance_map++;
} else {
boost = 255;
}
}
if (!pam_add_to_hash(acht, hash, boost, px, row, rows)) {
return false;
}
}
}
acht->cols = cols;
acht->rows += rows;
return true;
}
LIQ_PRIVATE bool pam_add_to_hash(struct acolorhash_table *acht, unsigned int hash, unsigned int boost, union rgba_as_int px, unsigned int row, unsigned int rows)
{
/* head of the hash function stores first 2 colors inline (achl->used = 1..2),
to reduce number of allocations of achl->other_items.
*/
struct acolorhist_arr_head *achl = &buckets[hash];
struct acolorhist_arr_head *achl = &acht->buckets[hash];
if (achl->inline1.color.l == px.l && achl->used) {
achl->inline1.perceptual_weight += boost;
continue;
return true;
}
if (achl->used) {
if (achl->used > 1) {
if (achl->inline2.color.l == px.l) {
achl->inline2.perceptual_weight += boost;
continue;
return true;
}
// other items are stored as an array (which gets reallocated if needed)
struct acolorhist_arr_item *other_items = achl->other_items;
@ -78,7 +87,7 @@ LIQ_PRIVATE bool pam_computeacolorhash(struct acolorhash_table *acht, const rgba
for (; i < achl->used-2; i++) {
if (other_items[i].color.l == px.l) {
other_items[i].perceptual_weight += boost;
goto continue_outer_loop;
return true;
}
}
@ -89,13 +98,11 @@ LIQ_PRIVATE bool pam_computeacolorhash(struct acolorhash_table *acht, const rgba
.perceptual_weight = boost,
};
achl->used++;
++colors;
continue;
++acht->colors;
return true;
}
if (++colors > maxacolors) {
acht->colors = colors;
acht->freestackp = freestackp;
if (++acht->colors > acht->maxcolors) {
return false;
}
@ -103,22 +110,24 @@ LIQ_PRIVATE bool pam_computeacolorhash(struct acolorhash_table *acht, const rgba
unsigned int capacity;
if (!other_items) { // there was no array previously, alloc "small" array
capacity = 8;
if (freestackp <= 0) {
if (acht->freestackp <= 0) {
// estimate how many colors are going to be + headroom
const int mempool_size = ((acht->rows + rows-row) * 2 * colors / (acht->rows + row + 1) + 1024) * sizeof(struct acolorhist_arr_item);
const size_t mempool_size = ((acht->rows + rows-row) * 2 * acht->colors / (acht->rows + row + 1) + 1024) * sizeof(struct acolorhist_arr_item);
new_items = mempool_alloc(&acht->mempool, sizeof(struct acolorhist_arr_item)*capacity, mempool_size);
} else {
// freestack stores previously freed (reallocated) arrays that can be reused
// (all pesimistically assumed to be capacity = 8)
new_items = freestack[--freestackp];
new_items = acht->freestack[--acht->freestackp];
}
} else {
const unsigned int stacksize = sizeof(acht->freestack)/sizeof(acht->freestack[0]);
// simply reallocs and copies array to larger capacity
capacity = achl->capacity*2 + 16;
if (freestackp < stacksize-1) {
freestack[freestackp++] = other_items;
if (acht->freestackp < stacksize-1) {
acht->freestack[acht->freestackp++] = other_items;
}
const int mempool_size = ((acht->rows + rows-row) * 2 * colors / (acht->rows + row + 1) + 32*capacity) * sizeof(struct acolorhist_arr_item);
const size_t mempool_size = ((acht->rows + rows-row) * 2 * acht->colors / (acht->rows + row + 1) + 32*capacity) * sizeof(struct acolorhist_arr_item);
new_items = mempool_alloc(&acht->mempool, sizeof(struct acolorhist_arr_item)*capacity, mempool_size);
if (!new_items) return false;
memcpy(new_items, other_items, sizeof(other_items[0])*achl->capacity);
@ -136,34 +145,25 @@ LIQ_PRIVATE bool pam_computeacolorhash(struct acolorhash_table *acht, const rgba
achl->inline2.color.l = px.l;
achl->inline2.perceptual_weight = boost;
achl->used = 2;
++colors;
++acht->colors;
}
} else {
achl->inline1.color.l = px.l;
achl->inline1.perceptual_weight = boost;
achl->used = 1;
++colors;
++acht->colors;
}
continue_outer_loop:;
}
}
acht->colors = colors;
acht->cols = cols;
acht->rows += rows;
acht->freestackp = freestackp;
return true;
}
LIQ_PRIVATE struct acolorhash_table *pam_allocacolorhash(unsigned int maxcolors, unsigned int surface, unsigned int ignorebits, void* (*malloc)(size_t), void (*free)(void*))
{
const unsigned int estimated_colors = MIN(maxcolors, surface/(ignorebits + (surface > 512*512 ? 5 : 4)));
const unsigned int hash_size = estimated_colors < 66000 ? 6673 : (estimated_colors < 200000 ? 12011 : 24019);
const size_t estimated_colors = MIN(maxcolors, surface/(ignorebits + (surface > 512*512 ? 6 : 5)));
const size_t hash_size = estimated_colors < 66000 ? 6673 : (estimated_colors < 200000 ? 12011 : 24019);
mempool m = NULL;
const unsigned int buckets_size = hash_size * sizeof(struct acolorhist_arr_head);
const unsigned int mempool_size = sizeof(struct acolorhash_table) + buckets_size + estimated_colors * sizeof(struct acolorhist_arr_item);
mempoolptr m = NULL;
const size_t buckets_size = hash_size * sizeof(struct acolorhist_arr_head);
const size_t mempool_size = sizeof(struct acolorhash_table) + buckets_size + estimated_colors * sizeof(struct acolorhist_arr_item);
struct acolorhash_table *t = mempool_create(&m, sizeof(*t) + buckets_size, mempool_size, malloc, free);
if (!t) return NULL;
*t = (struct acolorhash_table){
@ -172,14 +172,20 @@ LIQ_PRIVATE struct acolorhash_table *pam_allocacolorhash(unsigned int maxcolors,
.maxcolors = maxcolors,
.ignorebits = ignorebits,
};
memset(t->buckets, 0, hash_size * sizeof(struct acolorhist_arr_head));
memset(t->buckets, 0, buckets_size);
return t;
}
#define PAM_ADD_TO_HIST(entry) { \
hist->achv[j].acolor = to_f(gamma_lut, entry.color.rgba); \
total_weight += hist->achv[j].adjusted_weight = hist->achv[j].perceptual_weight = MIN(entry.perceptual_weight, max_perceptual_weight); \
++j; \
ALWAYS_INLINE static float pam_add_to_hist(const float *gamma_lut, hist_item *achv, unsigned int *j, const struct acolorhist_arr_item *entry, const float max_perceptual_weight)
{
if (entry->perceptual_weight == 0) {
return 0;
}
const float w = MIN(entry->perceptual_weight/128.f, max_perceptual_weight);
achv[*j].adjusted_weight = achv[*j].perceptual_weight = w;
achv[*j].acolor = rgba_to_f(gamma_lut, entry->color.rgba);
*j += 1;
return w;
}
LIQ_PRIVATE histogram *pam_acolorhashtoacolorhist(const struct acolorhash_table *acht, const double gamma, void* (*malloc)(size_t), void (*free)(void*))
@ -187,7 +193,7 @@ LIQ_PRIVATE histogram *pam_acolorhashtoacolorhist(const struct acolorhash_table
histogram *hist = malloc(sizeof(hist[0]));
if (!hist || !acht) return NULL;
*hist = (histogram){
.achv = malloc(acht->colors * sizeof(hist->achv[0])),
.achv = malloc(MAX(1,acht->colors) * sizeof(hist->achv[0])),
.size = acht->colors,
.free = free,
.ignorebits = acht->ignorebits,
@ -202,29 +208,36 @@ LIQ_PRIVATE histogram *pam_acolorhashtoacolorhist(const struct acolorhash_table
float max_perceptual_weight = 0.1f * acht->cols * acht->rows;
double total_weight = 0;
for(unsigned int j=0, i=0; i < acht->hash_size; ++i) {
unsigned int j=0;
for(unsigned int i=0; i < acht->hash_size; ++i) {
const struct acolorhist_arr_head *const achl = &acht->buckets[i];
if (achl->used) {
PAM_ADD_TO_HIST(achl->inline1);
total_weight += pam_add_to_hist(gamma_lut, hist->achv, &j, &achl->inline1, max_perceptual_weight);
if (achl->used > 1) {
PAM_ADD_TO_HIST(achl->inline2);
total_weight += pam_add_to_hist(gamma_lut, hist->achv, &j, &achl->inline2, max_perceptual_weight);
for(unsigned int k=0; k < achl->used-2; k++) {
PAM_ADD_TO_HIST(achl->other_items[k]);
total_weight += pam_add_to_hist(gamma_lut, hist->achv, &j, &achl->other_items[k], max_perceptual_weight);
}
}
}
}
hist->size = j;
hist->total_perceptual_weight = total_weight;
if (!j) {
pam_freeacolorhist(hist);
return NULL;
}
return hist;
}
LIQ_PRIVATE void pam_freeacolorhash(struct acolorhash_table *acht)
{
mempool_destroy(acht->mempool);
if (acht) {
mempool_destroy(acht->mempool);
}
}
LIQ_PRIVATE void pam_freeacolorhist(histogram *hist)
@ -244,7 +257,6 @@ LIQ_PRIVATE colormap *pam_colormap(unsigned int colors, void* (*malloc)(size_t),
*map = (colormap){
.malloc = malloc,
.free = free,
.subset_palette = NULL,
.colors = colors,
};
memset(map->palette, 0, colors_size);
@ -257,15 +269,11 @@ LIQ_PRIVATE colormap *pam_duplicate_colormap(colormap *map)
for(unsigned int i=0; i < map->colors; i++) {
dupe->palette[i] = map->palette[i];
}
if (map->subset_palette) {
dupe->subset_palette = pam_duplicate_colormap(map->subset_palette);
}
return dupe;
}
LIQ_PRIVATE void pam_freecolormap(colormap *c)
{
if (c->subset_palette) pam_freecolormap(c->subset_palette);
c->free(c);
}

View File

@ -16,6 +16,12 @@
#ifndef PAM_H
#define PAM_H
// accidental debug assertions make color search much slower,
// so force assertions off if there's no explicit setting
#if !defined(NDEBUG) && !defined(DEBUG)
#define NDEBUG
#endif
#include <math.h>
#include <assert.h>
#include <stdlib.h>
@ -29,7 +35,7 @@
#define MAX_DIFF 1e20
#ifndef USE_SSE
# if defined(__SSE__) && (defined(WIN32) || defined(__WIN32__))
# if defined(__SSE__) && (defined(__amd64__) || defined(__X86_64__) || defined(_WIN64) || defined(WIN32) || defined(__WIN32__))
# define USE_SSE 1
# else
# define USE_SSE 0
@ -62,6 +68,12 @@
# define SSE_ALIGN
#endif
#ifndef _MSC_VER
#define LIQ_ARRAY(type, var, count) type var[count]
#else
#define LIQ_ARRAY(type, var, count) type* var = (type*)_alloca(sizeof(type)*(count))
#endif
#if defined(__GNUC__) || defined (__llvm__)
#define ALWAYS_INLINE __attribute__((always_inline)) inline
#define NEVER_INLINE __attribute__ ((noinline))
@ -85,7 +97,7 @@ typedef struct {
float a, r, g, b;
} SSE_ALIGN f_pixel;
static const double internal_gamma = 0.5499;
static const float internal_gamma = 0.5499f;
LIQ_PRIVATE void to_f_set_gamma(float gamma_lut[], const double gamma);
@ -93,8 +105,8 @@ LIQ_PRIVATE void to_f_set_gamma(float gamma_lut[], const double gamma);
Converts 8-bit color to internal gamma and premultiplied alpha.
(premultiplied color space is much better for blending of semitransparent colors)
*/
ALWAYS_INLINE static f_pixel to_f(const float gamma_lut[], const rgba_pixel px);
inline static f_pixel to_f(const float gamma_lut[], const rgba_pixel px)
ALWAYS_INLINE static f_pixel rgba_to_f(const float gamma_lut[], const rgba_pixel px);
inline static f_pixel rgba_to_f(const float gamma_lut[], const rgba_pixel px)
{
float a = px.a/255.f;
@ -106,7 +118,7 @@ inline static f_pixel to_f(const float gamma_lut[], const rgba_pixel px)
};
}
inline static rgba_pixel to_rgb(const float gamma, const f_pixel px)
inline static rgba_pixel f_to_rgb(const float gamma, const f_pixel px)
{
if (px.a < 1.f/256.f) {
return (rgba_pixel){0,0,0,0};
@ -141,7 +153,7 @@ inline static double colordifference_ch(const double x, const double y, const do
// maximum of channel blended on white, and blended on black
// premultiplied alpha and backgrounds 0/1 shorten the formula
const double black = x-y, white = black+alphas;
return black*black + white*white;
return MAX(black*black, white*white);
}
ALWAYS_INLINE static float colordifference_stdc(const f_pixel px, const f_pixel py);
@ -166,23 +178,6 @@ inline static float colordifference_stdc(const f_pixel px, const f_pixel py)
colordifference_ch(px.b, py.b, alphas);
}
ALWAYS_INLINE static double min_colordifference_ch(const double x, const double y, const double alphas);
inline static double min_colordifference_ch(const double x, const double y, const double alphas)
{
const double black = x-y, white = black+alphas;
return MIN(black*black , white*white) * 2.f;
}
/* least possible difference between colors (difference varies depending on background they're blended on) */
ALWAYS_INLINE static float min_colordifference(const f_pixel px, const f_pixel py);
inline static float min_colordifference(const f_pixel px, const f_pixel py)
{
const double alphas = py.a-px.a;
return min_colordifference_ch(px.r, py.r, alphas) +
min_colordifference_ch(px.g, py.g, alphas) +
min_colordifference_ch(px.b, py.b, alphas);
}
ALWAYS_INLINE static float colordifference(f_pixel px, f_pixel py);
inline static float colordifference(f_pixel px, f_pixel py)
{
@ -199,7 +194,7 @@ inline static float colordifference(f_pixel px, f_pixel py)
onblack = _mm_mul_ps(onblack, onblack);
onwhite = _mm_mul_ps(onwhite, onwhite);
const __m128 max = _mm_add_ps(onwhite, onblack);
const __m128 max = _mm_max_ps(onwhite, onblack);
// add rgb, not a
const __m128 maxhl = _mm_movehl_ps(max, max);
@ -243,27 +238,24 @@ typedef struct {
typedef struct {
f_pixel acolor;
float popularity;
bool fixed; // if true it's user-supplied and must not be changed (e.g in K-Means iteration)
} colormap_item;
typedef struct colormap {
unsigned int colors;
void* (*malloc)(size_t);
void (*free)(void*);
struct colormap *subset_palette;
colormap_item palette[];
} colormap;
struct acolorhist_arr_item {
union rgba_as_int color;
float perceptual_weight;
unsigned int perceptual_weight;
};
struct acolorhist_arr_head {
struct acolorhist_arr_item inline1, inline2;
unsigned int used, capacity;
struct {
union rgba_as_int color;
float perceptual_weight;
} inline1, inline2;
struct acolorhist_arr_item *other_items;
};
@ -280,6 +272,7 @@ LIQ_PRIVATE void pam_freeacolorhash(struct acolorhash_table *acht);
LIQ_PRIVATE struct acolorhash_table *pam_allocacolorhash(unsigned int maxcolors, unsigned int surface, unsigned int ignorebits, void* (*malloc)(size_t), void (*free)(void*));
LIQ_PRIVATE histogram *pam_acolorhashtoacolorhist(const struct acolorhash_table *acht, const double gamma, void* (*malloc)(size_t), void (*free)(void*));
LIQ_PRIVATE bool pam_computeacolorhash(struct acolorhash_table *acht, const rgba_pixel *const pixels[], unsigned int cols, unsigned int rows, const unsigned char *importance_map);
LIQ_PRIVATE bool pam_add_to_hash(struct acolorhash_table *acht, unsigned int hash, unsigned int boost, union rgba_as_int px, unsigned int row, unsigned int rows);
LIQ_PRIVATE void pam_freeacolorhist(histogram *h);

87
pngquant/pom.xml Normal file
View File

@ -0,0 +1,87 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.pngquant</groupId>
<artifactId>libimagequant</artifactId>
<packaging>jar</packaging>
<version>2.1.1</version>
<name>pngquant</name>
<url>http://pngquant.org</url>
<build>
<sourceDirectory>.</sourceDirectory>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.1</version>
<executions>
<execution>
<id>build</id>
<phase>compile</phase>
<goals><goal>exec</goal></goals>
<configuration>
<executable>make</executable>
<arguments>
<argument>-j8</argument>
<argument>USE_SSE=1</argument>
<argument>java</argument>
</arguments>
</configuration>
</execution>
<execution>
<id>clean</id>
<phase>clean</phase>
<goals><goal>exec</goal></goals>
<configuration>
<executable>make</executable>
<arguments>
<argument>clean</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>mac-x64</id>
<activation>
<os>
<family>Mac</family>
<arch>x64</arch>
</os>
</activation>
<dependencies>
<dependency>
<groupId>org.pngquant</groupId>
<artifactId>libimagequant-jni</artifactId>
<version>1</version>
<type>jnilib</type>
<classifier>mac-x64</classifier>
</dependency>
</dependencies>
</profile>
<profile>
<id>linux-x64</id>
<activation>
<os>
<family>unix</family>
<name>Linux</name>
<arch>x64</arch>
</os>
</activation>
<dependencies>
<dependency>
<groupId>org.pngquant</groupId>
<artifactId>libimagequant-jni</artifactId>
<type>so</type>
<version>1</version>
<classifier>linux-x64</classifier>
</dependency>
</dependencies>
</profile>
</profiles>
<dependencies>
</dependencies>
</project>

63
pngquant/rust/build.rs Normal file
View File

@ -0,0 +1,63 @@
//! This is a build script for Cargo https://crates.io/
//! It produces a static library that can be used by C or Rust.
extern crate cc;
use std::env;
use std::path::PathBuf;
use std::fs::canonicalize;
fn main() {
let mut cc = cc::Build::new();
let compiler = cc.get_compiler();
cc.warnings(false);
if env::var("PROFILE").map(|p|p != "debug").unwrap_or(true) {
cc.define("NDEBUG", Some("1"));
} else {
cc.define("DEBUG", Some("1"));
}
if cfg!(feature = "openmp") {
cc.flag(&env::var("DEP_OPENMP_FLAG").unwrap());
}
let target_arch = env::var("CARGO_CFG_TARGET_ARCH").expect("Needs CARGO_CFG_TARGET_ARCH");
if target_arch =="x86_64" ||
(target_arch == "x86" && cfg!(feature = "sse")) {
cc.flag(if compiler.is_like_msvc() {"/arch:SSE2"} else {"-msse"});
cc.define("USE_SSE", Some("1"));
}
let outdated_c_compiler = env::var("TARGET").unwrap().contains("windows-msvc");
let has_msvc_files = PathBuf::from("msvc-dist/libimagequant.c").exists();
if outdated_c_compiler && has_msvc_files {
println!("cargo:include={}", canonicalize("msvc-dist").unwrap().display());
cc.file("msvc-dist/libimagequant.c")
.file("msvc-dist/nearest.c")
.file("msvc-dist/kmeans.c")
.file("msvc-dist/mediancut.c")
.file("msvc-dist/mempool.c")
.file("msvc-dist/pam.c")
.file("msvc-dist/blur.c");
} else {
// This is so that I don't forget to publish MSVC version as well
if !has_msvc_files {
println!("cargo:warning=msvc-dist/ directory not present. MSVC builds may fail");
}
println!("cargo:include={}", canonicalize(".").unwrap().display());
if !compiler.is_like_msvc() {
cc.flag("-std=c99");
}
cc.file("libimagequant.c")
.file("nearest.c")
.file("kmeans.c")
.file("mediancut.c")
.file("mempool.c")
.file("pam.c")
.file("blur.c");
}
cc.compile("libimagequant.a");
}

View File

@ -0,0 +1,307 @@
//! Small, portable C library for high-quality conversion of RGBA images to 8-bit indexed-color (palette) images.
//! It's powering [pngquant2](https://pngquant.org).
//!
//! This is a low-level crate exposing a C API. If you're looking for a Rust library, see [imagequant](https://crates.io/crates/imagequant).
//!
//! ## License
//!
//! Libimagequant is dual-licensed:
//!
//! * For Free/Libre Open Source Software it's available under [GPL v3 or later](https://raw.github.com/ImageOptim/libimagequant/master/COPYRIGHT) with additional copyright notices for older parts of the code.
//!
//! * For use in non-GPL software (e.g. closed-source or App Store distribution) please ask kornel@pngquant.org for a commercial license.
//!
//! ## Overview
//!
//! The basic flow is:
//!
//! 1. Create attributes object and configure the library.
//! 2. Create image object from RGBA pixels or data source.
//! 3. Perform quantization (generate palette).
//! 4. Store remapped image and final palette.
//! 5. Free memory.
//!
//! Please note that libimagequant only handles raw uncompressed arrays of pixels in memory and is completely independent of any file format.
//!
//! There are 3 ways to create image object for quantization:
//!
//! * `liq_image_create_rgba()` for simple, contiguous RGBA pixel arrays (width×height×4 bytes large bitmap).
//! * `liq_image_create_rgba_rows()` for non-contiguous RGBA pixel arrays (that have padding between rows or reverse order, e.g. BMP).
//! * `liq_image_create_custom()` for RGB, ABGR, YUV and all other formats that can be converted on-the-fly to RGBA (you have to supply the conversion function).
//!
//! Note that "image" here means raw uncompressed pixels. If you have a compressed image file, such as PNG, you must use another library (e.g. lodepng) to decode it first.
#![allow(non_camel_case_types)]
#[cfg(feature = "openmp")]
extern crate openmp_sys;
use std::os::raw::{c_int, c_uint, c_char, c_void};
use std::error;
use std::fmt;
use std::error::Error;
pub enum liq_attr {}
pub enum liq_image {}
pub enum liq_result {}
pub enum liq_histogram {}
pub type liq_color = rgb::RGBA8;
#[repr(C)]
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum liq_error {
LIQ_OK = 0,
LIQ_QUALITY_TOO_LOW = 99,
LIQ_VALUE_OUT_OF_RANGE = 100,
LIQ_OUT_OF_MEMORY,
LIQ_ABORTED,
LIQ_BITMAP_NOT_AVAILABLE,
LIQ_BUFFER_TOO_SMALL,
LIQ_INVALID_POINTER,
LIQ_UNSUPPORTED,
}
#[repr(C)]
#[derive(Copy, Clone)]
pub enum liq_ownership {
LIQ_OWN_ROWS = 4,
LIQ_OWN_PIXELS = 8,
LIQ_COPY_PIXELS = 16,
}
#[repr(C)]
pub struct liq_palette {
pub count: c_int,
pub entries: [liq_color; 256],
}
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct liq_histogram_entry {
pub color: liq_color,
pub count: c_uint,
}
impl error::Error for liq_error {
fn description(&self) -> &str {
match *self {
liq_error::LIQ_OK => "OK",
liq_error::LIQ_QUALITY_TOO_LOW => "LIQ_QUALITY_TOO_LOW",
liq_error::LIQ_VALUE_OUT_OF_RANGE => "VALUE_OUT_OF_RANGE",
liq_error::LIQ_OUT_OF_MEMORY => "OUT_OF_MEMORY",
liq_error::LIQ_ABORTED => "LIQ_ABORTED",
liq_error::LIQ_BITMAP_NOT_AVAILABLE => "BITMAP_NOT_AVAILABLE",
liq_error::LIQ_BUFFER_TOO_SMALL => "BUFFER_TOO_SMALL",
liq_error::LIQ_INVALID_POINTER => "INVALID_POINTER",
liq_error::LIQ_UNSUPPORTED => "LIQ_UNSUPPORTED",
}
}
}
impl fmt::Display for liq_error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.description())
}
}
impl liq_error {
#[inline]
pub fn is_ok(&self) -> bool {
*self == liq_error::LIQ_OK
}
pub fn is_err(&self) -> bool {
!self.is_ok()
}
#[inline]
pub fn ok(&self) -> Result<(), liq_error> {
match *self {
liq_error::LIQ_OK => Ok(()),
e => Err(e),
}
}
#[inline]
pub fn ok_or<E>(self, err: E) -> Result<(), E> {
if self.is_ok() {
Ok(())
} else {
Err(err)
}
}
pub fn unwrap(&self) {
assert!(self.is_ok(), "{}", self);
}
pub fn expect(&self, msg: &str) {
assert!(self.is_ok(), "{}", msg);
}
}
pub type liq_log_callback_function = Option<unsafe extern "C" fn(arg1: &liq_attr, message: *const c_char, user_info: *mut c_void)>;
pub type liq_log_flush_callback_function = Option<unsafe extern "C" fn(arg1: &liq_attr, user_info: *mut c_void)>;
pub type liq_progress_callback_function = Option<unsafe extern "C" fn(progress_percent: f32, user_info: *mut c_void) -> c_int>;
pub type liq_image_get_rgba_row_callback = unsafe extern "C" fn(row_out: *mut liq_color, row: c_int, width: c_int, user_info: *mut c_void);
#[link(name="imagequant", kind="static")]
extern "C" {
/// Returns object that will hold initial settings (attributes) for the library.
///
/// The object should be freed using `liq_attr_destroy()` after it's no longer needed.
/// Returns `NULL` in the unlikely case that the library cannot run on the current machine (e.g. the library has been compiled for SSE-capable x86 CPU and run on VIA C3 CPU).
pub fn liq_attr_create() -> *mut liq_attr;
pub fn liq_attr_copy(orig: &liq_attr) -> *mut liq_attr;
pub fn liq_attr_destroy(attr: &mut liq_attr);
/// Specifies maximum number of colors to use.
///
/// The default is 256. Instead of setting a fixed limit it's better to use `liq_set_quality()`.
/// The first argument is attributes object from `liq_attr_create()`.
/// Returns `LIQ_VALUE_OUT_OF_RANGE` if number of colors is outside the range 2-256.
pub fn liq_set_max_colors(attr: &mut liq_attr, colors: c_int) -> liq_error;
pub fn liq_get_max_colors(attr: &liq_attr) -> c_int;
pub fn liq_set_speed(attr: &mut liq_attr, speed: c_int) -> liq_error;
pub fn liq_get_speed(attr: &liq_attr) -> c_int;
pub fn liq_set_min_posterization(attr: &mut liq_attr, bits: c_int) -> liq_error;
pub fn liq_get_min_posterization(attr: &liq_attr) -> c_int;
/// Quality is in range `0` (worst) to `100` (best) and values are analoguous to JPEG quality (i.e. `80` is usually good enough).
///
/// Quantization will attempt to use the lowest number of colors needed to achieve `maximum` quality. `maximum` value of `100` is the default and means conversion as good as possible.
/// If it's not possible to convert the image with at least `minimum` quality (i.e. 256 colors is not enough to meet the minimum quality), then `liq_image_quantize()` will fail. The default minumum is `0` (proceeds regardless of quality).
/// Quality measures how well the generated palette fits image given to `liq_image_quantize()`. If a different image is remapped with `liq_write_remapped_image()` then actual quality may be different.
/// Regardless of the quality settings the number of colors won't exceed the maximum (see `liq_set_max_colors()`).
/// The first argument is attributes object from `liq_attr_create()`.
///
/// Returns `LIQ_VALUE_OUT_OF_RANGE` if target is lower than minimum or any of them is outside the 0-100 range.
/// Returns `LIQ_INVALID_POINTER` if `attr` appears to be invalid.
pub fn liq_set_quality(attr: &mut liq_attr, minimum: c_int, maximum: c_int) -> liq_error;
pub fn liq_get_min_quality(attr: &liq_attr) -> c_int;
pub fn liq_get_max_quality(attr: &liq_attr) -> c_int;
pub fn liq_set_last_index_transparent(attr: &mut liq_attr, is_last: c_int);
pub fn liq_image_create_rgba_rows(attr: &liq_attr, rows: *const *const u8, width: c_int, height: c_int, gamma: f64) -> *mut liq_image;
/// Creates an object that represents the image pixels to be used for quantization and remapping.
///
/// The pixel array must be contiguous run of RGBA pixels (alpha is the last component, 0 = transparent, 255 = opaque).
///
/// The first argument is attributes object from `liq_attr_create()`. The same `attr` object should be used for the entire process, from creation of images to quantization.
///
/// The `pixels` array must not be modified or freed until this object is freed with `liq_image_destroy()`. See also `liq_image_set_memory_ownership()`.
///
/// `width` and `height` are dimensions in pixels. An image 10x10 pixel large will need a 400-byte array.
///
/// `gamma` can be `0` for images with the typical 1/2.2 [gamma](https://en.wikipedia.org/wiki/Gamma_correction).
/// Otherwise `gamma` must be > 0 and < 1, e.g. `0.45455` (1/2.2) or `0.55555` (1/1.8). Generated palette will use the same gamma unless `liq_set_output_gamma()` is used. If `liq_set_output_gamma` is not used, then it only affects whether brighter or darker areas of the image will get more palette colors allocated.
///
/// Returns `NULL` on failure, e.g. if `pixels` is `NULL` or `width`/`height` is <= 0.
pub fn liq_image_create_rgba(attr: &liq_attr, bitmap: *const u8, width: c_int, height: c_int, gamma: f64) -> *mut liq_image;
/// unsafe: It will crash if the owned memory wasn't allocated using `libc::malloc()` (or whatever allocator C side is using)
pub fn liq_image_set_memory_ownership(image: &liq_image, own: liq_ownership) -> liq_error;
pub fn liq_set_log_callback(arg1: &mut liq_attr, arg2: liq_log_callback_function, user_info: *mut c_void);
pub fn liq_set_log_flush_callback(arg1: &mut liq_attr, arg2: liq_log_flush_callback_function, user_info: *mut c_void);
pub fn liq_attr_set_progress_callback(arg1: &mut liq_attr, arg2: liq_progress_callback_function, user_info: *mut c_void);
pub fn liq_result_set_progress_callback(arg1: &mut liq_result, arg2: liq_progress_callback_function, user_info: *mut c_void);
pub fn liq_image_create_custom(attr: &liq_attr, row_callback: liq_image_get_rgba_row_callback, user_info: *mut c_void, width: c_int, height: c_int, gamma: f64) -> *mut liq_image;
/// Remap assuming the image will be always presented exactly on top of this background.
///
/// Takes ownership of the background image (i.e. do NOT use it afterwards, do NOT call liq_image_destroy on it).
///
/// The background must have the same size. The foreground image must have a transparent color.
pub fn liq_image_set_background(img: &mut liq_image, background: *mut liq_image) -> liq_error;
pub fn liq_image_set_importance_map(img: &mut liq_image, buffer: *mut u8, buffer_size: usize, own: liq_ownership) -> liq_error;
pub fn liq_image_add_fixed_color(img: &mut liq_image, color: liq_color) -> liq_error;
pub fn liq_image_get_width(img: &liq_image) -> c_int;
pub fn liq_image_get_height(img: &liq_image) -> c_int;
pub fn liq_image_destroy(img: &mut liq_image);
pub fn liq_histogram_create(attr: &liq_attr) -> *mut liq_histogram;
pub fn liq_histogram_add_image(hist: &mut liq_histogram, attr: &liq_attr, image: &mut liq_image) -> liq_error;
pub fn liq_histogram_add_colors(hist: &mut liq_histogram, attr: &liq_attr, entries: *const liq_histogram_entry, num_entries: c_int, gamma: f64) -> liq_error;
pub fn liq_histogram_add_fixed_color(hist: &mut liq_histogram, color: liq_color) -> liq_error;
pub fn liq_histogram_destroy(hist: &mut liq_histogram);
/// Performs quantization (palette generation) based on settings in `attr` (from `liq_attr_create()`) and pixels of the image.
///
/// Returns `LIQ_OK` if quantization succeeds and sets `liq_result` pointer in `out_result`. The last argument is used for receiving the `result` object:
///
/// liq_result *result;
/// if (LIQ_OK == liq_image_quantize(img, attr, &result)) { // Note &result
/// // result pointer is valid here
/// }
///
/// Returns `LIQ_QUALITY_TOO_LOW` if quantization fails due to limit set in `liq_set_quality()`.
///
/// See `liq_write_remapped_image()`.
///
/// If you want to generate one palette for multiple images at once, see `liq_histogram_create()`.
pub fn liq_quantize_image(options: &liq_attr, input_image: &liq_image) -> *mut liq_result;
pub fn liq_histogram_quantize(input_hist: &liq_histogram, options: &liq_attr, result_output: &mut *mut liq_result) -> liq_error;
pub fn liq_image_quantize(input_image: &liq_image, options: &liq_attr, result_output: &mut *mut liq_result) -> liq_error;
/// Enables/disables dithering in `liq_write_remapped_image()`.
///
/// Dithering level must be between `0` and `1` (inclusive). Dithering level `0` enables fast non-dithered remapping. Otherwise a variation of Floyd-Steinberg error diffusion is used.
///
/// Precision of the dithering algorithm depends on the speed setting, see `liq_set_speed()`.
///
/// Returns `LIQ_VALUE_OUT_OF_RANGE` if the dithering level is outside the 0-1 range.
pub fn liq_set_dithering_level(res: &mut liq_result, dither_level: f32) -> liq_error;
pub fn liq_set_output_gamma(res: &mut liq_result, gamma: f64) -> liq_error;
pub fn liq_get_output_gamma(result: &liq_result) -> f64;
/// Returns pointer to palette optimized for image that has been quantized or remapped
/// (final refinements are applied to the palette during remapping).
///
/// It's valid to call this method before remapping, if you don't plan to remap any images or want to use same palette for multiple images.
///
/// `liq_palette->count` contains number of colors (up to 256), `liq_palette->entries[n]` contains RGBA value for nth palette color.
pub fn liq_get_palette<'a>(result: &'a mut liq_result) -> &'a liq_palette;
/// Remaps the image to palette and writes its pixels to the given buffer, 1 pixel per byte.
///
/// The buffer must be large enough to fit the entire image, i.e. width×height bytes large. For safety, pass the size of the buffer as `buffer_size`.
///
/// For best performance call `liq_get_palette()` *after* this function, as palette is improved during remapping (except when `liq_histogram_quantize()` is used).
///
/// Returns `LIQ_BUFFER_TOO_SMALL` if given size of the buffer is not enough to fit the entire image.
///
/// int buffer_size = width*height;
/// char *buffer = malloc(buffer_size);
/// if (LIQ_OK == liq_write_remapped_image(result, input_image, buffer, buffer_size)) {
/// liq_palette *pal = liq_get_palette(result);
/// // save image
/// }
///
/// See `liq_get_palette()`.
///
/// The buffer is assumed to be contiguous, with rows ordered from top to bottom, and no gaps between rows. If you need to write rows with padding or upside-down order, then use `liq_write_remapped_image_rows()`.
///
/// Please note that it only writes raw uncompressed pixels to memory. It does not perform any PNG compression. If you'd like to create a PNG file then you need to pass the raw pixel data to another library, e.g. libpng or lodepng. See `rwpng.c` in `pngquant` project for an example how to do that.
pub fn liq_write_remapped_image(result: &mut liq_result, input_image: &mut liq_image, buffer: *mut u8, buffer_size: usize) -> liq_error;
pub fn liq_write_remapped_image_rows(result: &mut liq_result, input_image: &mut liq_image, row_pointers: *const *mut u8) -> liq_error;
pub fn liq_get_quantization_error(result: &liq_result) -> f64;
pub fn liq_get_quantization_quality(result: &liq_result) -> c_int;
pub fn liq_result_destroy(res: &mut liq_result);
pub fn liq_get_remapping_error(result: &liq_result) -> f64;
pub fn liq_get_remapping_quality(result: &liq_result) -> c_int;
pub fn liq_version() -> c_int;
}
#[test]
fn links_and_runs() {
use std::ptr;
unsafe {
assert!(liq_version() >= 20901);
let attr = liq_attr_create();
assert!(!attr.is_null());
let hist = liq_histogram_create(&*attr);
assert!(!hist.is_null());
let mut res = ptr::null_mut();
liq_histogram_quantize(&*hist, &*attr, &mut res);
assert!(res.is_null());
liq_histogram_destroy(&mut *hist);
liq_attr_destroy(&mut *attr);
}
}

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@ -1,89 +0,0 @@
#include "libimagequant.h"
#include "pam.h"
#include "viter.h"
#include "nearest.h"
#include <stdlib.h>
#include <string.h>
#ifdef _OPENMP
#include <omp.h>
#else
#define omp_get_max_threads() 1
#define omp_get_thread_num() 0
#endif
/*
* Voronoi iteration: new palette color is computed from weighted average of colors that map to that palette entry.
*/
LIQ_PRIVATE void viter_init(const colormap *map, const unsigned int max_threads, viter_state average_color[])
{
memset(average_color, 0, sizeof(average_color[0])*(VITER_CACHE_LINE_GAP+map->colors)*max_threads);
}
LIQ_PRIVATE void viter_update_color(const f_pixel acolor, const float value, const colormap *map, unsigned int match, const unsigned int thread, viter_state average_color[])
{
match += thread * (VITER_CACHE_LINE_GAP+map->colors);
average_color[match].a += acolor.a * value;
average_color[match].r += acolor.r * value;
average_color[match].g += acolor.g * value;
average_color[match].b += acolor.b * value;
average_color[match].total += value;
}
LIQ_PRIVATE void viter_finalize(colormap *map, const unsigned int max_threads, const viter_state average_color[])
{
for (unsigned int i=0; i < map->colors; i++) {
double a=0, r=0, g=0, b=0, total=0;
// Aggregate results from all threads
for(unsigned int t=0; t < max_threads; t++) {
const unsigned int offset = (VITER_CACHE_LINE_GAP+map->colors) * t + i;
a += average_color[offset].a;
r += average_color[offset].r;
g += average_color[offset].g;
b += average_color[offset].b;
total += average_color[offset].total;
}
if (total) {
map->palette[i].acolor = (f_pixel){
.a = a / total,
.r = r / total,
.g = g / total,
.b = b / total,
};
}
map->palette[i].popularity = total;
}
}
LIQ_PRIVATE double viter_do_iteration(histogram *hist, colormap *const map, const float min_opaque_val, viter_callback callback, const bool fast_palette)
{
const unsigned int max_threads = omp_get_max_threads();
viter_state average_color[(VITER_CACHE_LINE_GAP+map->colors) * max_threads];
viter_init(map, max_threads, average_color);
struct nearest_map *const n = nearest_init(map, fast_palette);
hist_item *const achv = hist->achv;
const int hist_size = hist->size;
double total_diff=0;
#pragma omp parallel for if (hist_size > 3000) \
schedule(static) default(none) shared(average_color,callback) reduction(+:total_diff)
for(int j=0; j < hist_size; j++) {
float diff;
unsigned int match = nearest_search(n, achv[j].acolor, achv[j].tmp.likely_colormap_index, min_opaque_val, &diff);
achv[j].tmp.likely_colormap_index = match;
total_diff += diff * achv[j].perceptual_weight;
viter_update_color(achv[j].acolor, achv[j].perceptual_weight, map, match, omp_get_thread_num(), average_color);
if (callback) callback(&achv[j], diff);
}
nearest_free(n);
viter_finalize(map, max_threads, average_color);
return total_diff / hist->total_perceptual_weight;
}

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@ -1,19 +0,0 @@
#ifndef VITER_H
#define VITER_H
// Spread memory touched by different threads at least 64B apart which I assume is the cache line size. This should avoid memory write contention.
#define VITER_CACHE_LINE_GAP ((64+sizeof(viter_state)-1)/sizeof(viter_state))
typedef struct {
double a, r, g, b, total;
} viter_state;
typedef void (*viter_callback)(hist_item *item, float diff);
LIQ_PRIVATE void viter_init(const colormap *map, const unsigned int max_threads, viter_state state[]);
LIQ_PRIVATE void viter_update_color(const f_pixel acolor, const float value, const colormap *map, unsigned int match, const unsigned int thread, viter_state average_color[]);
LIQ_PRIVATE void viter_finalize(colormap *map, const unsigned int max_threads, const viter_state state[]);
LIQ_PRIVATE double viter_do_iteration(histogram *hist, colormap *const map, const float min_opaque_val, viter_callback callback, const bool fast_palette);
#endif