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Diffstat (limited to 'src/3rdparty/libwebp/README')
| -rw-r--r-- | src/3rdparty/libwebp/README | 145 |
1 files changed, 123 insertions, 22 deletions
diff --git a/src/3rdparty/libwebp/README b/src/3rdparty/libwebp/README index 381b927..4c15c4a 100644 --- a/src/3rdparty/libwebp/README +++ b/src/3rdparty/libwebp/README @@ -4,7 +4,7 @@ \__\__/\____/\_____/__/ ____ ___ / _/ / \ \ / _ \/ _/ / \_/ / / \ \ __/ \__ - \____/____/\_____/_____/____/v0.5.0 + \____/____/\_____/_____/____/v0.6.0 Description: ============ @@ -20,7 +20,7 @@ https://chromium.googlesource.com/webm/libwebp It is released under the same license as the WebM project. See http://www.webmproject.org/license/software/ or the -file "COPYING" file for details. An additional intellectual +"COPYING" file for details. An additional intellectual property rights grant can be found in the file PATENTS. Building: @@ -84,6 +84,73 @@ be installed independently using a minor modification in the corresponding Makefile.am configure files (see comments there). See './configure --help' for more options. +Building for MIPS Linux: +------------------------ +MIPS Linux toolchain stable available releases can be found at: +https://community.imgtec.com/developers/mips/tools/codescape-mips-sdk/available-releases/ + +# Add toolchain to PATH +export PATH=$PATH:/path/to/toolchain/bin + +# 32-bit build for mips32r5 (p5600) +HOST=mips-mti-linux-gnu +MIPS_CFLAGS="-O3 -mips32r5 -mabi=32 -mtune=p5600 -mmsa -mfp64 \ + -msched-weight -mload-store-pairs -fPIE" +MIPS_LDFLAGS="-mips32r5 -mabi=32 -mmsa -mfp64 -pie" + +# 64-bit build for mips64r6 (i6400) +HOST=mips-img-linux-gnu +MIPS_CFLAGS="-O3 -mips64r6 -mabi=64 -mtune=i6400 -mmsa -mfp64 \ + -msched-weight -mload-store-pairs -fPIE" +MIPS_LDFLAGS="-mips64r6 -mabi=64 -mmsa -mfp64 -pie" + +./configure --host=${HOST} --build=`config.guess` \ + CC="${HOST}-gcc -EL" \ + CFLAGS="$MIPS_CFLAGS" \ + LDFLAGS="$MIPS_LDFLAGS" +make +make install + +CMake: +------ +The support for CMake is minimal: it only helps you compile libwebp, cwebp and +dwebp. + +Prerequisites: +A compiler (e.g., gcc with autotools) and CMake. +On a Debian-like system the following should install everything you need for a +minimal build: +$ sudo apt-get install build-essential cmake + +When building from git sources, you will need to run cmake to generate the +configure script. + +mkdir build && cd build && cmake ../ +make +make install + +If you also want cwebp or dwebp, you will need to enable them through CMake: + +cmake -DWEBP_BUILD_CWEBP=ON -DWEBP_BUILD_DWEBP=ON ../ + +or through your favorite interface (like ccmake or cmake-qt-gui). + +Gradle: +------- +The support for Gradle is minimal: it only helps you compile libwebp, cwebp and +dwebp and webpmux_example. + +Prerequisites: +A compiler (e.g., gcc with autotools) and gradle. +On a Debian-like system the following should install everything you need for a +minimal build: +$ sudo apt-get install build-essential gradle + +When building from git sources, you will need to run the Gradle wrapper with the +appropriate target, e.g. : + +./gradlew buildAllExecutables + SWIG bindings: -------------- @@ -151,10 +218,11 @@ If input size (-s) for an image is not specified, it is assumed to be a PNG, JPEG, TIFF or WebP file. Options: - -h / -help ............ short help - -H / -longhelp ........ long help - -q <float> ............. quality factor (0:small..100:big) - -alpha_q <int> ......... transparency-compression quality (0..100) + -h / -help ............. short help + -H / -longhelp ......... long help + -q <float> ............. quality factor (0:small..100:big), default=75 + -alpha_q <int> ......... transparency-compression quality (0..100), + default=100 -preset <string> ....... preset setting, one of: default, photo, picture, drawing, icon, text @@ -162,17 +230,18 @@ Options: -z <int> ............... activates lossless preset with given level in [0:fast, ..., 9:slowest] - -m <int> ............... compression method (0=fast, 6=slowest) - -segments <int> ........ number of segments to use (1..4) + -m <int> ............... compression method (0=fast, 6=slowest), default=4 + -segments <int> ........ number of segments to use (1..4), default=4 -size <int> ............ target size (in bytes) -psnr <float> .......... target PSNR (in dB. typically: 42) -s <int> <int> ......... input size (width x height) for YUV - -sns <int> ............. spatial noise shaping (0:off, 100:max) - -f <int> ............... filter strength (0=off..100) - -sharpness <int> ....... filter sharpness (0:most .. 7:least sharp) + -sns <int> ............. spatial noise shaping (0:off, 100:max), default=50 + -f <int> ............... filter strength (0=off..100), default=60 + -sharpness <int> ....... filter sharpness (0:most .. 7:least sharp), default=0 -strong ................ use strong filter instead of simple (default) -nostrong .............. use simple filter instead of strong + -sharp_yuv ............. use sharper (and slower) RGB->YUV conversion -partition_limit <int> . limit quality to fit the 512k limit on the first partition (0=no degradation ... 100=full) -pass <int> ............ analysis pass number (1..10) @@ -185,18 +254,18 @@ Options: -print_ssim ............ prints averaged SSIM distortion -print_lsim ............ prints local-similarity distortion -d <file.pgm> .......... dump the compressed output (PGM file) - -alpha_method <int> .... transparency-compression method (0..1) + -alpha_method <int> .... transparency-compression method (0..1), default=1 -alpha_filter <string> . predictive filtering for alpha plane, one of: none, fast (default) or best - -exact ................. preserve RGB values in transparent area + -exact ................. preserve RGB values in transparent area, default=off -blend_alpha <hex> ..... blend colors against background color expressed as RGB values written in hexadecimal, e.g. 0xc0e0d0 for red=0xc0 green=0xe0 and blue=0xd0 -noalpha ............... discard any transparency information - -lossless .............. encode image losslessly + -lossless .............. encode image losslessly, default=off -near_lossless <int> ... use near-lossless image - preprocessing (0..100=off) + preprocessing (0..100=off), default=100 -hint <string> ......... specify image characteristics hint, one of: photo, picture or graph @@ -274,7 +343,7 @@ Use following options to convert into alternate image formats: -yuv ......... save the raw YUV samples in flat layout Other options are: - -version .... print version number and exit + -version ..... print version number and exit -nofancy ..... don't use the fancy YUV420 upscaler -nofilter .... disable in-loop filtering -nodither .... disable dithering @@ -286,8 +355,8 @@ Use following options to convert into alternate image formats: -flip ........ flip the output vertically -alpha ....... only save the alpha plane -incremental . use incremental decoding (useful for tests) - -h ....... this help message - -v ....... verbose (e.g. print encoding/decoding times) + -h ........... this help message + -v ........... verbose (e.g. print encoding/decoding times) -quiet ....... quiet mode, don't print anything -noasm ....... disable all assembly optimizations @@ -303,7 +372,7 @@ Usage: vwebp in_file [options] Decodes the WebP image file and visualize it using OpenGL Options are: - -version .... print version number and exit + -version ..... print version number and exit -noicc ....... don't use the icc profile if present -nofancy ..... don't use the fancy YUV420 upscaler -nofilter .... disable in-loop filtering @@ -311,11 +380,12 @@ Options are: -noalphadither disable alpha plane dithering -mt .......... use multi-threading -info ........ print info - -h ....... this help message + -h ........... this help message Keyboard shortcuts: 'c' ................ toggle use of color profile 'i' ................ overlay file information + 'd' ................ disable blending & disposal (debug) 'q' / 'Q' / ESC .... quit Building: @@ -344,6 +414,37 @@ $ make -f makefile.unix examples/vwebp > nmake /f Makefile.vc CFG=release-static \ ../obj/x64/release-static/bin/vwebp.exe +Animation creation tool: +======================== +The utility 'img2webp' can turn a sequence of input images (PNG, JPEG, ...) +into an animated WebP file. It offers fine control over duration, encoding +modes, etc. + +Usage: + + img2webp [file-level options] [image files...] [per-frame options...] + +File-level options (only used at the start of compression): + -min_size ............ minimize size + -loop <int> .......... loop count (default: 0, = infinite loop) + -kmax <int> .......... maximum number of frame between key-frames + (0=only keyframes) + -kmin <int> .......... minimum number of frame between key-frames + (0=disable key-frames altogether) + -mixed ............... use mixed lossy/lossless automatic mode + -v ................... verbose mode + -h ................... this help + +Per-frame options (only used for subsequent images input): + -d <int> ............. frame duration in ms (default: 100) + -lossless ........... use lossless mode (default) + -lossy ... ........... use lossy mode + -q <float> ........... quality + -m <int> ............. method to use + +example: img2webp -loop 2 in0.png -lossy in1.jpg + -d 80 in2.tiff -o out.webp + Animated GIF conversion: ======================== Animated GIF files can be converted to WebP files with animation using the @@ -353,7 +454,7 @@ vwebp. Usage: gif2webp [options] gif_file -o webp_file Options: - -h / -help ............ this help + -h / -help ............. this help -lossy ................. encode image using lossy compression -mixed ................. for each frame in the image, pick lossy or lossless compression heuristically @@ -637,7 +738,7 @@ an otherwise too-large picture. Some CPU can be saved too, incidentally. Bugs: ===== -Please report all bugs to our issue tracker: +Please report all bugs to the issue tracker: https://bugs.chromium.org/p/webp Patches welcome! See this page to get started: http://www.webmproject.org/code/contribute/submitting-patches/ |