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Update libimagequant (2.9.1)

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Julien Humbert 2017-05-20 13:41:22 +02:00
parent ca22132c45
commit f4f6cc7285
25 changed files with 2413 additions and 922 deletions
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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
contributors and maintainers pledge to making participation in our project and
our community a harassment-free experience for everyone, regardless of age, body
size, disability, ethnicity, gender identity and expression, level of experience,
nationality, personal appearance, race, religion, or sexual identity and
orientation.
## Our Standards
Examples of behavior that contributes to creating a positive environment
include:
* Using welcoming and inclusive language
* Being respectful of differing viewpoints and experiences
* Gracefully accepting constructive criticism
* Focusing on what is best for the community
* Showing empathy towards other community members
Examples of unacceptable behavior by participants include:
* The use of sexualized language or imagery and unwelcome sexual attention or
advances
* Trolling, insulting/derogatory comments, and personal or political attacks
* Public or private harassment
* Publishing others' private information, such as a physical or electronic
address, without explicit permission
* Other conduct which could reasonably be considered inappropriate in a
professional setting
## Our Responsibilities
Project maintainers are responsible for clarifying the standards of acceptable
behavior and are expected to take appropriate and fair corrective action in
response to any instances of unacceptable behavior.
Project maintainers have the right and responsibility to remove, edit, or
reject comments, commits, code, wiki edits, issues, and other contributions
that are not aligned to this Code of Conduct, or to ban temporarily or
permanently any contributor for other behaviors that they deem inappropriate,
threatening, offensive, or harmful.
## Scope
This Code of Conduct applies both within project spaces and in public spaces
when an individual is representing the project or its community. Examples of
representing a project or community include using an official project e-mail
address, posting via an official social media account, or acting as an appointed
representative at an online or offline event. Representation of a project may be
further defined and clarified by project maintainers.
## Enforcement
Instances of abusive, harassing, or otherwise unacceptable behavior may be
reported by contacting the project team at kornel@geekhood.net. All
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is deemed necessary and appropriate to the circumstances. The project team is
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Further details of specific enforcement policies may be posted separately.
Project maintainers who do not follow or enforce the Code of Conduct in good
faith may face temporary or permanent repercussions as determined by other
members of the project's leadership.
## Attribution
This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
available at [http://contributor-covenant.org/version/1/4][version]
[homepage]: http://contributor-covenant.org
[version]: http://contributor-covenant.org/version/1/4/

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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:
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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© 1997-2002 by Greg Roelofs; based on an idea by Stefan Schneider.
© 2009-2014 by Kornel Lesiński.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
© 1989, 1991 by Jef Poskanzer.
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.

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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),
and contains extensive changes and additions by Kornel Lesiński
licensed under GPL v3.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
libimagequant © 2009-2016 by Kornel Lesiński.
GNU GENERAL PUBLIC LICENSE
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63
third_party/pngquant/lib/Makefile vendored
View File

@ -1,16 +1,25 @@
-include config.mk
STATICLIB=libimagequant.a
SHAREDLIB=libimagequant.$(SOLIBSUFFIX)
SOVER=0
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 = $(OBJS:.o=.c) *.h README.md CHANGELOG COPYRIGHT Makefile configure
TARNAME = libimagequant-$(VERSION)
TARFILE = $(TARNAME)-src.tar.bz2
@ -18,18 +27,47 @@ all: static
static: $(STATICLIB)
dll:
$(MAKE) CFLAGSADD="-DLIQ_EXPORT='__declspec(dllexport)'" $(DLL)
shared: $(SHAREDLIB)
dll:
$(MAKE) CFLAGSADD="-DIMAGEQUANT_EXPORTS" $(DLL)
java: $(JNILIB)
java-dll:
$(MAKE) CFLAGSADD="-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)
$(CC) -shared -Wl,-soname,$(SHAREDLIB).$(SOVER) -o $(SHAREDLIB).$(SOVER) $^ $(LDFLAGS)
ln -fs $(SHAREDLIB).$(SOVER) $(SHAREDLIB)
libimagequant.dylib: $(SHAREDOBJS)
$(CC) -shared -o $(SHAREDLIB).$(SOVER) $^ $(LDFLAGS)
ln -fs $(SHAREDLIB).$(SOVER) $(SHAREDLIB)
$(OBJS): $(wildcard *.h) config.mk
$(JNILIB): $(JAVAHEADERS) $(STATICLIB) org/pngquant/PngQuant.c
$(CC) -g $(CFLAGS) $(LDFLAGS) $(JAVAINCLUDE) -shared -o $@ $(STATICLIB) org/pngquant/PngQuant.c
$(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)
$(TARFILE): $(DISTFILES)
@ -41,15 +79,16 @@ $(TARFILE): $(DISTFILES)
-shasum $(TARFILE)
clean:
rm -f $(OBJS) $(STATICLIB) $(TARFILE) $(DLL) $(DLLIMP) $(DLLDEF)
rm -f $(OBJS) $(SHAREDOBJS) $(SHAREDLIB).$(SOVER) $(SHAREDLIB) $(STATICLIB) $(TARFILE) $(DLL) '$(DLLIMP)' '$(DLLDEF)'
rm -f $(JAVAHEADERS) $(JAVACLASSES) $(JNILIB)
distclean: clean
rm -f config.mk
ifeq ($(filter %clean %distclean, $(MAKECMDGOALS)), )
config.mk:
ifeq ($(filter %clean %distclean, $(MAKECMDGOALS)), )
./configure
endif
.PHONY: all static clean dist distclean dll
.PHONY: all static shared clean dist distclean dll java
.DELETE_ON_ERROR:

266
third_party/pngquant/lib/MANUAL.md → third_party/pngquant/lib/README.md vendored
View File

@ -1,42 +1,55 @@
# 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).
It's powering [pngquant2](https://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.
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.
## 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).
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 and C++ programs. It has no external dependencies.
The library can be linked with ANSI C, C++, [Rust](https://github.com/pornel/libimagequant-rust) and [Java](https://github.com/ImageOptim/libimagequant/tree/master/org/pngquant) programs. It has no external dependencies.
To build on Unix-like systems run:
make -C lib
make static
it will create `lib/libimagequant.a` which you can link with your program.
it will create `libimagequant.a` which you can link with your program.
gcc yourprogram.c /path/to/lib/libimagequant.a
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 lib/*.c yourprogram.c
gcc -std=c99 -O3 -DNDEBUG libimagequant/*.c yourprogram.c
In [Rust](https://github.com/pornel/libimagequant-rust),
if using Cargo, add [`imagequant`](https://crates.io/crates/imagequant/) to dependencies.
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 **2013** (MSVC 18) and an [MSVC-compatible branch of the library](https://github.com/pornel/pngquant/tree/msvc/lib)
* Use Visual Studio **2013** (MSVC 18) and an [MSVC-compatible branch of the library](https://github.com/ImageOptim/libimagequant/tree/msvc)
* 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
@ -44,27 +57,35 @@ The library can be compiled with any C compiler that has at least basic support
The basic flow is:
1. Create attributes object and configure the library.
2. Create image object from RGBA bitmap or data source.
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>
#include "lib/libimagequant.h"
#include "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_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, bitmap, bitmap_size);
liq_write_remapped_image(res, image, example_bitmap_8bpp, example_bitmap_size);
const liq_palette *pal = liq_get_palette(res);
// use image and palette here
// 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_attr_destroy(attr);
liq_image_destroy(image);
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.
@ -72,10 +93,12 @@ It's safe to pass `NULL` to any function accepting `liq_attr`, `liq_image`, `liq
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_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.
## Functions
----
@ -92,6 +115,8 @@ Returns `NULL` in the unlikely case that the library cannot run on the current m
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.
----
@ -108,12 +133,14 @@ Quality is in range `0` (worst) to `100` (best) and values are analoguous to JPE
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).
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_quantize_image()`. If a different image is remapped with `liq_write_remapped_image()` then actual quality may be different.
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.
@ -134,26 +161,28 @@ 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);
liq_image *liq_image_create_rgba(liq_attr *attr, void* pixels, 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).
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 bitmap must not be modified or freed until this object is freed with `liq_image_destroy()`. See also `liq_image_set_memory_ownership()`.
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.
`width` and `height` are dimensions in pixels. An image 10x10 pixel large will need 400-byte bitmap.
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()`.
`gamma` can be `0` for images with the typical 1/2.2 [gamma](http://en.wikipedia.org/wiki/Gamma_correction).
`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 `bitmap` is `NULL` or `width`/`height` is <= 0.
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 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.
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.
`rows` array must have at least `height` elements and each row must be at least `width` RGBA pixels wide.
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*));
@ -166,20 +195,29 @@ Same as `liq_image_create_rgba()`, but takes array of pointers to rows in the bi
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()`).
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_result *liq_quantize_image(liq_attr *attr, liq_image *input_image);
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` and pixels of the image.
Performs quantization (palette generation) based on settings in `attr` (from `liq_attr_create()`) and pixels of the image.
Returns `NULL` if quantization fails, e.g. due to limit set in `liq_set_quality()`.
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);
@ -194,9 +232,11 @@ 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`.
Remaps the image to palette and writes its pixels to the given buffer, 1 pixel per byte.
For best performance call `liq_get_palette()` *after* this function, as palette is improved during remapping.
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.
@ -207,7 +247,11 @@ Returns `LIQ_BUFFER_TOO_SMALL` if given size of the buffer is not enough to fit
// save image
}
See `liq_get_palette()` and `liq_write_remapped_image_rows()`.
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.
----
@ -228,6 +272,7 @@ 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.
@ -262,7 +307,7 @@ 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.
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.
@ -332,17 +377,17 @@ The library doesn't support RGB bitmaps "natively", because supporting only sing
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()`).
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 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_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 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()`.
* `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 image is not backed by a bitmap.
Returns `LIQ_VALUE_OUT_OF_RANGE` if invalid flags are specified or the image object only takes pixels from a callback.
----
@ -350,7 +395,7 @@ Returns `LIQ_VALUE_OUT_OF_RANGE` if invalid flags are specified or image is not
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.
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`.
@ -358,11 +403,19 @@ 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.
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 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 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).
----
@ -370,23 +423,30 @@ This function should be called *after* `liq_write_remapped_image()`. It may retu
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()`).
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_quantize_image(attr, img);
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);
res = liq_quantize_image(attr, img);
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);
@ -402,16 +462,37 @@ This function can be used to add upper limit to quality options presented to the
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.
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 to the callback.
`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.
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*));
@ -442,6 +523,85 @@ 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);
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.
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.
---
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()`.
## Multithreading
The library is stateless and doesn't use any global or thread-local storage. It doesn't use any locks.

10
third_party/pngquant/lib/README.third_party vendored 100644
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@ -0,0 +1,10 @@
URL: https://github.com/ImageOptim/libimagequant/archive/2.9.1.tar.gz
Version: 2.9.1
License: GPLv3
License File: LICENSE
Description:
Image Quantization Library.
Local Modifications:
The COPYIRIGHT file is renamed LICENSE.

20
third_party/pngquant/lib/blur.c vendored
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@ -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;

77
third_party/pngquant/lib/configure vendored
View File

@ -2,7 +2,7 @@
CONFIG="config.mk"
PREFIX="/usr/local"
VERSION=$(grep "define PNGQUANT_VERSION" ../pngquant.c | grep -Eo "[12]\.[0-9.]+")
VERSION=$(grep LIQ_VERSION_STRING libimagequant.h | grep -Eo "2\.[0-9.]+")
DEBUG=
SSE=auto
@ -21,14 +21,18 @@ for i in "$@"; do
case $i in
--help)
echo
help "--prefix= installation directory [$PREFIX]"
help "--extra-cflags= append to CFLAGS"
help "--extra-ldflags= append to LDFLAGS"
help "--prefix=<dir> installation directory [$PREFIX]"
help "--extra-cflags=<flags> append to CFLAGS"
help "--extra-ldflags=<flags> append to LDFLAGS"
echo
help "--enable-debug"
help "--enable-sse/--disable-sse enable/disable SSE instructions"
echo
help "--with-openmp compile with multicore support"
help "--with-openmp=static compile with multicore support"
echo
help "CC=<compiler> use given compiler command"
help "CFLAGS=<flags> pass options to the compiler"
help "LDFLAGS=<flags> pass options to the linker"
echo
exit 0
;;
@ -54,6 +58,9 @@ for i in "$@"; do
--with-openmp)
OPENMP=1
;;
--with-openmp=static)
OPENMP=static
;;
--prefix=*)
PREFIX=${i#*=}
;;
@ -65,8 +72,7 @@ for i in "$@"; do
EXTRA_LDFLAGS="$EXTRA_LDFLAGS ${i#*=}"
;;
*)
echo "error: unknown switch ${i%%=*}"
exit 1
echo "warning: unknown switch ${i%%=*} (see $0 --help for the list)"
;;
esac
done
@ -93,7 +99,7 @@ status() {
# Append to CFLAGS if compiler supports flag, with optional prerequisite.
# Fails on errors and warnings.
conditional_cflags() {
if [ -z "$("$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 "$1"
fi
}
@ -106,33 +112,35 @@ error() {
echo
# basic check
if ! "$CC" -xc -std=c99 <(echo "int main(){}") -o /dev/null &> /dev/null; then
error "Compiler" "$CC is no C compiler"
# /tmp, because mingw has problems opening /dev/null and gives false negative
if ! echo "int main(){}" | "$CC" -xc -std=c99 -o /tmp/gcccheck - > /dev/null; then
error "Compiler" "$CC failed to compile anything (make sure it's installed and supports C99)"
fi
status "Compiler" "$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 "$DEBUG" ]; then
cflags "-DNDEBUG"
cflags "-O3 -DNDEBUG"
status "Debug" "no"
else
cflags "-g"
cflags "-O1 -g"
status "Debug" "yes"
fi
# SSE
if [ "$SSE" = 'auto' ]; then
if [[ "$(uname -m)" =~ (amd|x86_)64 ||
SSE=0
if type uname > /dev/null; then
if [[ "$(uname -m)" =~ "amd64" || "$(uname -m)" =~ "x86_64" ||
"$(grep -E -m1 "^flags" /proc/cpuinfo)" =~ "sse" ]]; then
SSE=1
fi
fi
fi
if [ "$SSE" -eq 1 ]; then
@ -150,15 +158,19 @@ fi
# OpenMP
if [ -n "$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 "$OPENMPFLAGS"
status "OpenMP" "yes"
else
error "OpenMP" "not supported by compiler"
error "OpenMP" "not supported by compiler (please install a compiler that supports OpenMP (e.g. gcc) and specify it with the CC= argument)"
fi
else
# silence warnings about omp pragmas
@ -167,6 +179,26 @@ else
status "OpenMP" "no"
fi
# Cocoa
if [[ "$OSTYPE" =~ "darwin" ]]; then
cflags "-mmacosx-version-min=10.6"
lflags "-mmacosx-version-min=10.6"
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
echo
# As of GCC 4.5, 387 fp math is significantly slower in C99 mode without this.
@ -203,4 +235,5 @@ VERSION = $VERSION
CC = $CC
CFLAGS = $CFLAGS
LDFLAGS = $LDFLAGS
" > $CONFIG
SOLIBSUFFIX = $SOLIBSUFFIX
" > "$CONFIG"

107
third_party/pngquant/lib/kmeans.c vendored 100644
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@ -0,0 +1,107 @@
/*
© 2011-2016 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"
#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();
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;
#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, &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
third_party/pngquant/lib/kmeans.h vendored 100644
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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

937
third_party/pngquant/lib/libimagequant.c vendored
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File diff suppressed because it is too large Load Diff

111
third_party/pngquant/lib/libimagequant.h vendored
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@ -1,18 +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 20901
#define LIQ_VERSION_STRING "2.9.1"
#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
@ -25,6 +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;
@ -40,63 +53,89 @@ 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};
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 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_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
}

141
third_party/pngquant/lib/mediancut.c vendored
View File

@ -1,8 +1,25 @@
/*
** © 2009-2015 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/>.
*/
/*
** 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.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
@ -21,7 +38,7 @@
#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 +63,7 @@ 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;
@ -191,10 +208,10 @@ 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);
@ -228,7 +245,7 @@ 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]);
}
/*
@ -261,15 +278,13 @@ 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 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;
@ -306,12 +321,22 @@ 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]);
box->variance = box_variance(achv, box);
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];
@ -319,31 +344,19 @@ LIQ_PRIVATE colormap *mediancut(histogram *hist, const float min_opaque_val, uns
/*
** 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;
double sum = 0;
for(unsigned int i=0; i < hist->size; i++) {
sum += achv[i].adjusted_weight;
}
box_init(&bv[0], achv, 0, hist->size, sum);
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);
}
// 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;
@ -380,20 +393,8 @@ LIQ_PRIVATE colormap *mediancut(histogram *hist, const float min_opaque_val, uns
double lowersum = 0;
for(unsigned int i=0; i < break_at; i++) lowersum += achv[indx + i].adjusted_weight;
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]);
box_init(&bv[bi], achv, bv[bi].ind, break_at, lowersum);
box_init(&bv[boxes], achv, indx + break_at, clrs - break_at, sm - lowersum);
++boxes;
@ -405,8 +406,7 @@ LIQ_PRIVATE colormap *mediancut(histogram *hist, const float min_opaque_val, uns
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;
}
@ -433,65 +433,28 @@ 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) {
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) {

2
third_party/pngquant/lib/mediancut.h vendored
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*));

20
third_party/pngquant/lib/mempool.c vendored
View File

@ -1,3 +1,21 @@
/*
© 2011-2016 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 "mempool.h"
@ -42,7 +60,7 @@ 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(mempool *mptr, const unsigned int size, const unsigned int max_size)
{
if (((*mptr)->used+size) <= (*mptr)->size) {
unsigned int prevused = (*mptr)->used;

4
third_party/pngquant/lib/mempool.h vendored
View File

@ -6,8 +6,8 @@
struct mempool;
typedef struct mempool *mempool;
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_create(mempool *mptr, const unsigned int size, unsigned int capacity, void* (*malloc)(size_t), void (*free)(void*));
LIQ_PRIVATE void* mempool_alloc(mempool *mptr, const unsigned int size, const unsigned int capacity);
LIQ_PRIVATE void mempool_destroy(mempool m);
#endif

337
third_party/pngquant/lib/nearest.c vendored
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"
@ -5,234 +23,181 @@
#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[];
};
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;
}
}
return second_best;
}
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);
}
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;
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++;
static vp_node *vp_create_node(mempool *m, vp_sort_tmp *indexes, int num_indexes, const colormap_item items[]) {
if (num_indexes <= 0) {
return NULL;
}
qsort(&colors, colorsused, sizeof(colors[0]), compareradius);
assert(colorsused < 2 || colors[0].radius <= colors[1].radius); // closest first
vp_node *node = mempool_alloc(m, sizeof(node[0]), 0);
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,
if (num_indexes == 1) {
*node = (vp_node){
.vantage_point = items[indexes[0].idx].acolor,
.idx = indexes[0].idx,
.radius = MAX_DIFF,
};
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;
return node;
}
// 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;
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 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);
LIQ_PRIVATE struct nearest_map *nearest_init(const colormap *map) {
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;
struct nearest_map *handle = mempool_create(&m, sizeof(handle[0]), sizeof(handle[0]) + sizeof(vp_node)*map->colors+16, map->malloc, map->free);
vp_sort_tmp indexes[map->colors];
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
indexes[i].idx = i;
}
centroids->map = map;
vp_node *root = vp_create_node(&m, indexes, map->colors, map->palette);
*handle = (struct nearest_map){
.root = root,
.palette = map->palette,
.mempool = m,
};
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;
for(unsigned int i=0; i < map->colors; i++) {
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
}
// 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);
return handle;
}
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) {
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));
if (distance < best_candidate->distance && best_candidate->exclude != node->idx) {
best_candidate->distance = distance;
best_candidate->idx = node->idx;
}
// 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;
}
}
// 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;
} while(true);
}
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;
const struct head *const heads = centroids->heads;
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]) {
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)

4
third_party/pngquant/lib/nearest.h vendored
View File

@ -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);

102
third_party/pngquant/lib/pam.c vendored
View File

@ -3,7 +3,7 @@
** 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.
** © 2009-2016 by Kornel Lesinski.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
@ -22,20 +22,14 @@
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) {
@ -51,6 +45,7 @@ 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 = 10;
} else {
// mask posterizes all 4 channels in one go
px.l = (px.l & posterize_mask) | ((px.l & posterize_high_mask) >> (8-ignorebits));
@ -58,19 +53,32 @@ LIQ_PRIVATE bool pam_computeacolorhash(struct acolorhash_table *acht, const rgba
hash = px.l % hash_size;
}
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, float 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 +86,7 @@ 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 +97,11 @@ 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 +109,24 @@ 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 +144,25 @@ 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);
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 +171,16 @@ 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)
{
achv[j].acolor = rgba_to_f(gamma_lut, entry->color.rgba);
const float w = MIN(entry->perceptual_weight, max_perceptual_weight);
achv[j].adjusted_weight = achv[j].perceptual_weight = w;
return w;
}
LIQ_PRIVATE histogram *pam_acolorhashtoacolorhist(const struct acolorhash_table *acht, const double gamma, void* (*malloc)(size_t), void (*free)(void*))
@ -187,7 +188,7 @@ 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,
@ -205,13 +206,13 @@ LIQ_PRIVATE histogram *pam_acolorhashtoacolorhist(const struct acolorhash_table
for(unsigned int j=0, 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);
}
}
}
@ -224,7 +225,9 @@ LIQ_PRIVATE histogram *pam_acolorhashtoacolorhist(const struct acolorhash_table
LIQ_PRIVATE void pam_freeacolorhash(struct acolorhash_table *acht)
{
if (acht) {
mempool_destroy(acht->mempool);
}
}
LIQ_PRIVATE void pam_freeacolorhist(histogram *hist)
@ -244,7 +247,6 @@ 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 +259,11 @@ 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);
}

48
third_party/pngquant/lib/pam.h vendored
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@ -29,7 +29,7 @@
#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
@ -43,9 +43,20 @@
# define SSE_ALIGN
# else
# define SSE_ALIGN __attribute__ ((aligned (16)))
# if defined(__i386__) && defined(__PIC__)
# define cpuid(func,ax,bx,cx,dx)\
__asm__ __volatile__ ( \
"push %%ebx\n" \
"cpuid\n" \
"mov %%ebx, %1\n" \
"pop %%ebx\n" \
: "=a" (ax), "=r" (bx), "=c" (cx), "=d" (dx) \
: "a" (func));
# else
# define cpuid(func,ax,bx,cx,dx)\
__asm__ __volatile__ ("cpuid":\
"=a" (ax), "=b" (bx), "=c" (cx), "=d" (dx) : "a" (func));
# endif
#endif
#else
# define SSE_ALIGN
@ -82,8 +93,8 @@ 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;
@ -95,7 +106,7 @@ 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};
@ -130,7 +141,7 @@ 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);
@ -155,23 +166,6 @@ 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)
{
@ -188,7 +182,7 @@ 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);
@ -232,13 +226,13 @@ 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;
@ -248,11 +242,8 @@ struct acolorhist_arr_item {
};
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;
};
@ -269,6 +260,7 @@ 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, float boost, union rgba_as_int px, unsigned int row, unsigned int rows);
LIQ_PRIVATE void pam_freeacolorhist(histogram *h);

87
third_party/pngquant/lib/pom.xml vendored 100644
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@ -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>

89
third_party/pngquant/lib/viter.c vendored
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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;
}

19
third_party/pngquant/lib/viter.h vendored
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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