Merge pull request #1009 from felixbuenemann/8bit-png-quantization-support
8-Bit PNG Quantization Support
This commit is contained in:
John Cupitt
GitHub
commit
a3780a761e
23
configure.ac
23
configure.ac
@ -1142,6 +1142,24 @@ if test x"$with_png" != "xno"; then
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)
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fi
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# look for libimagequant with pkg-config (only if libpng is enabled)
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AC_ARG_WITH([imagequant],
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AS_HELP_STRING([--without-imagequant], [build without imagequant (default: test)]))
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if test x"$with_imagequant" != "xno" && test x"$with_png" != "xno"; then
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PKG_CHECK_MODULES(IMAGEQUANT, imagequant,
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[AC_DEFINE(HAVE_IMAGEQUANT,1,[define if you have imagequant installed.])
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with_imagequant=yes
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PACKAGES_USED="$PACKAGES_USED imagequant"
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],
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[AC_MSG_WARN([libimagequant not found; disabling 8bpp PNG support])
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with_imagequant=no
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]
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)
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else
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with_imagequant=no
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fi
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# look for libjpeg with pkg-config ... fall back to our tester
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AC_ARG_WITH([jpeg],
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AS_HELP_STRING([--without-jpeg], [build without libjpeg (default: test)]))
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@ -1260,14 +1278,14 @@ fi
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# Gather all up for VIPS_CFLAGS, VIPS_INCLUDES, VIPS_LIBS
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# sort includes to get longer, more specific dirs first
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# helps, for example, selecting graphicsmagick over imagemagick
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VIPS_CFLAGS=`for i in $VIPS_CFLAGS $GTHREAD_CFLAGS $REQUIRED_CFLAGS $EXPAT_CFLAGS $ZLIB_CFLAGS $PANGOFT2_CFLAGS $GSF_CFLAGS $FFTW_CFLAGS $MAGICK_CFLAGS $JPEG_CFLAGS $PNG_CFLAGS $EXIF_CFLAGS $MATIO_CFLAGS $CFITSIO_CFLAGS $LIBWEBP_CFLAGS $LIBWEBPMUX_CFLAGS $GIFLIB_INCLUDES $RSVG_CFLAGS $PDFIUM_INCLUDES $POPPLER_CFLAGS $OPENEXR_CFLAGS $OPENSLIDE_CFLAGS $ORC_CFLAGS $TIFF_CFLAGS $LCMS_CFLAGS
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VIPS_CFLAGS=`for i in $VIPS_CFLAGS $GTHREAD_CFLAGS $REQUIRED_CFLAGS $EXPAT_CFLAGS $ZLIB_CFLAGS $PANGOFT2_CFLAGS $GSF_CFLAGS $FFTW_CFLAGS $MAGICK_CFLAGS $JPEG_CFLAGS $PNG_CFLAGS $IMAGEQUANT_CFLAGS $EXIF_CFLAGS $MATIO_CFLAGS $CFITSIO_CFLAGS $LIBWEBP_CFLAGS $LIBWEBPMUX_CFLAGS $GIFLIB_INCLUDES $RSVG_CFLAGS $PDFIUM_INCLUDES $POPPLER_CFLAGS $OPENEXR_CFLAGS $OPENSLIDE_CFLAGS $ORC_CFLAGS $TIFF_CFLAGS $LCMS_CFLAGS
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do
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echo $i
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done | sort -ru`
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VIPS_CFLAGS=`echo $VIPS_CFLAGS`
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VIPS_CFLAGS="$VIPS_DEBUG_FLAGS $VIPS_CFLAGS"
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VIPS_INCLUDES="$ZLIB_INCLUDES $PNG_INCLUDES $TIFF_INCLUDES $JPEG_INCLUDES"
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VIPS_LIBS="$ZLIB_LIBS $MAGICK_LIBS $PNG_LIBS $TIFF_LIBS $JPEG_LIBS $GTHREAD_LIBS $REQUIRED_LIBS $EXPAT_LIBS $PANGOFT2_LIBS $GSF_LIBS $FFTW_LIBS $ORC_LIBS $LCMS_LIBS $GIFLIB_LIBS $RSVG_LIBS $PDFIUM_LIBS $POPPLER_LIBS $OPENEXR_LIBS $OPENSLIDE_LIBS $CFITSIO_LIBS $LIBWEBP_LIBS $LIBWEBPMUX_LIBS $MATIO_LIBS $EXIF_LIBS -lm"
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VIPS_LIBS="$ZLIB_LIBS $MAGICK_LIBS $PNG_LIBS $IMAGEQUANT_LIBS $TIFF_LIBS $JPEG_LIBS $GTHREAD_LIBS $REQUIRED_LIBS $EXPAT_LIBS $PANGOFT2_LIBS $GSF_LIBS $FFTW_LIBS $ORC_LIBS $LCMS_LIBS $GIFLIB_LIBS $RSVG_LIBS $PDFIUM_LIBS $POPPLER_LIBS $OPENEXR_LIBS $OPENSLIDE_LIBS $CFITSIO_LIBS $LIBWEBP_LIBS $LIBWEBPMUX_LIBS $MATIO_LIBS $EXIF_LIBS -lm"
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AC_SUBST(VIPS_LIBDIR)
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@ -1375,6 +1393,7 @@ support webp metadata: $with_libwebpmux
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text rendering with pangoft2: $with_pangoft2
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file import/export with libpng: $with_png
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(requires libpng-1.2.9 or later)
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support 8bpp PNG quantisation: $with_imagequant
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file import/export with libtiff: $with_tiff
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file import/export with giflib: $with_giflib
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file import/export with libjpeg: $with_jpeg
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@ -197,10 +197,12 @@ int vips__png_header_buffer( const void *buffer, size_t length, VipsImage *out )
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int vips__png_write( VipsImage *in, const char *filename,
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int compress, int interlace, const char *profile,
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VipsForeignPngFilter filter, gboolean strip );
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VipsForeignPngFilter filter, gboolean strip,
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gboolean palette, int colours, int Q, double dither );
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int vips__png_write_buf( VipsImage *in,
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void **obuf, size_t *olen, int compression, int interlace,
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const char *profile, VipsForeignPngFilter filter, gboolean strip );
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const char *profile, VipsForeignPngFilter filter, gboolean strip,
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gboolean palette, int colours, int Q, double dither );
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/* Map WEBP metadata names to vips names.
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*/
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@ -60,6 +60,10 @@ typedef struct _VipsForeignSavePng {
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gboolean interlace;
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char *profile;
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VipsForeignPngFilter filter;
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gboolean palette;
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int colours;
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int Q;
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double dither;
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} VipsForeignSavePng;
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typedef VipsForeignSaveClass VipsForeignSavePngClass;
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@ -133,6 +137,34 @@ vips_foreign_save_png_class_init( VipsForeignSavePngClass *class )
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VIPS_TYPE_FOREIGN_PNG_FILTER,
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VIPS_FOREIGN_PNG_FILTER_ALL );
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VIPS_ARG_BOOL( class, "palette", 13,
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_( "Palette" ),
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_( "Quantise to 8bpp palette" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsForeignSavePng, palette ),
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FALSE );
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VIPS_ARG_INT( class, "colours", 14,
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_( "Colours" ),
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_( "Max number of palette colours" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsForeignSavePng, colours ),
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2, 256, 256 );
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VIPS_ARG_INT( class, "Q", 15,
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_( "Quality" ),
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_( "Quantisation quality" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsForeignSavePng, Q ),
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0, 100, 100 );
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VIPS_ARG_DOUBLE( class, "dither", 16,
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_( "Dithering" ),
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_( "Amount of dithering" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsForeignSavePng, dither ),
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0.0, 1.0, 1.0 );
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}
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static void
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@ -140,6 +172,9 @@ vips_foreign_save_png_init( VipsForeignSavePng *png )
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{
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png->compression = 6;
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png->filter = VIPS_FOREIGN_PNG_FILTER_ALL;
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png->colours = 256;
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png->Q = 100;
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png->dither = 1.0;
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}
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typedef struct _VipsForeignSavePngFile {
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@ -166,7 +201,8 @@ vips_foreign_save_png_file_build( VipsObject *object )
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if( vips__png_write( save->ready,
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png_file->filename, png->compression, png->interlace,
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png->profile, png->filter, save->strip ) )
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png->profile, png->filter, save->strip, png->palette,
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png->colours, png->Q, png->dither ) )
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return( -1 );
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return( 0 );
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@ -225,7 +261,7 @@ vips_foreign_save_png_buffer_build( VipsObject *object )
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if( vips__png_write_buf( save->ready, &obuf, &olen,
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png->compression, png->interlace, png->profile, png->filter,
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save->strip ) )
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save->strip, png->palette, png->colours, png->Q, png->dither ) )
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return( -1 );
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/* vips__png_write_buf() makes a buffer that needs g_free(), not
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@ -278,6 +314,10 @@ vips_foreign_save_png_buffer_init( VipsForeignSavePngBuffer *buffer )
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* * @interlace: interlace image
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* * @profile: ICC profile to embed
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* * @filter: #VipsForeignPngFilter row filter flag(s)
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* * @palette: enable quantisation to 8bpp palette
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* * @colours: max number of palette colours for quantisation
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* * @Q: quality for 8bpp quantisation (does not exceed @colours)
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* * @dither: amount of dithering for 8bpp quantization
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*
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* Write a VIPS image to a file as PNG.
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*
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@ -304,6 +344,13 @@ vips_foreign_save_png_buffer_init( VipsForeignSavePngBuffer *buffer )
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* alpha before saving. Images with more than one byte per band element are
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* saved as 16-bit PNG, others are saved as 8-bit PNG.
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*
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* Set @palette to %TRUE to enable quantisation to an 8-bit per pixel palette
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* image with alpha transparency support. If @colours is given, it limits the
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* maximum number of palette entries. Similar to JPEG the quality can also be
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* be changed with the @Q parameter which further reduces the palette size and
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* @dither controls the amount of Floyd-Steinberg dithering.
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* This feature requires libvips to be compiled with libimagequant.
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*
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* See also: vips_image_new_from_file().
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*
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* Returns: 0 on success, -1 on error.
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@ -124,6 +124,10 @@
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#error "PNG library too old."
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#endif
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#ifdef HAVE_IMAGEQUANT
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#include <libimagequant.h>
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#endif
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static void
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user_error_function( png_structp png_ptr, png_const_charp error_msg )
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{
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@ -877,12 +881,110 @@ write_png_block( VipsRegion *region, VipsRect *area, void *a )
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return( 0 );
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}
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#ifdef HAVE_IMAGEQUANT
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static int
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quantise_image( VipsImage *in, VipsImage *out, VipsImage *palette_out,
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int colours, int Q, double dither )
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{
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/* Ensure input is sRGB. */
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if( in->Type != VIPS_INTERPRETATION_sRGB) {
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VipsImage *srgb;
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if( vips_colourspace( in, &srgb, VIPS_INTERPRETATION_sRGB,
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NULL ) )
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return( -1 );
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in = srgb;
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VIPS_UNREF( srgb );
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}
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/* Add alpha channel if missing. */
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if( !vips_image_hasalpha(in) ) {
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VipsImage *srgba;
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if( vips_bandjoin_const1( in, &srgba, 255, NULL ) )
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return( -1 );
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in = srgba;
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VIPS_UNREF( srgba );
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}
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VipsImage *memory;
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if( !(memory = vips_image_copy_memory( in )) )
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return( -1 );
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in = memory;
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liq_attr *attr = liq_attr_create();
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liq_set_max_colors( attr, colours );
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liq_set_quality( attr, 0, Q );
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liq_image *input_image = liq_image_create_rgba( attr,
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VIPS_IMAGE_ADDR( in, 0, 0 ), in->Xsize, in->Ysize, 0 );
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liq_result *quantisation_result;
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if ( liq_image_quantize( input_image, attr, &quantisation_result ) ) {
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liq_result_destroy( quantisation_result );
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liq_image_destroy( input_image );
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liq_attr_destroy( attr );
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VIPS_UNREF( memory );
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return( -1 );
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}
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liq_set_dithering_level( quantisation_result, (float) dither );
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vips_image_init_fields( out, in->Xsize, in->Ysize, 1, VIPS_FORMAT_UCHAR,
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VIPS_CODING_NONE, VIPS_INTERPRETATION_B_W, 1.0, 1.0 );
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if( vips_image_write_prepare( out ) ) {
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liq_result_destroy( quantisation_result );
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liq_image_destroy( input_image );
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liq_attr_destroy( attr );
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VIPS_UNREF( memory );
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return( -1 );
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}
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if( liq_write_remapped_image( quantisation_result, input_image,
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VIPS_IMAGE_ADDR( out, 0, 0 ), VIPS_IMAGE_N_PELS( out ) ) ) {
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liq_result_destroy( quantisation_result );
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liq_image_destroy( input_image );
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liq_attr_destroy( attr );
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VIPS_UNREF( memory );
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return( -1 );
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}
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const liq_palette *palette = liq_get_palette( quantisation_result );
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vips_image_init_fields( palette_out, palette->count, 1, 4,
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VIPS_FORMAT_UCHAR, VIPS_CODING_NONE, VIPS_INTERPRETATION_sRGB,
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1.0, 1.0 );
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if( vips_image_write_prepare( palette_out ) ) {
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liq_result_destroy( quantisation_result );
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liq_image_destroy( input_image );
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liq_attr_destroy( attr );
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VIPS_UNREF( memory );
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return( -1 );
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}
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int i;
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for( i = 0; i < palette->count; i++ ) {
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unsigned char *p = VIPS_IMAGE_ADDR( palette_out, i, 0 );
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p[0] = palette->entries[i].r;
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p[1] = palette->entries[i].g;
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p[2] = palette->entries[i].b;
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p[3] = palette->entries[i].a;
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}
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liq_result_destroy( quantisation_result );
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liq_image_destroy( input_image );
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liq_attr_destroy( attr );
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VIPS_UNREF( memory );
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return( 0 );
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}
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#endif /*HAVE_IMAGEQUANT*/
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/* Write a VIPS image to PNG.
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*/
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static int
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write_vips( Write *write,
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int compress, int interlace, const char *profile,
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VipsForeignPngFilter filter, gboolean strip )
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VipsForeignPngFilter filter, gboolean strip,
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gboolean palette, int colours, int Q, double dither )
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{
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VipsImage *in = write->in;
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@ -942,6 +1044,20 @@ write_vips( Write *write,
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return( -1 );
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}
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#ifdef HAVE_IMAGEQUANT
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/* Enable image quantisation to paletted 8bpp PNG if colours is set.
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*/
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if( palette ) {
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g_assert( colours >= 2 && colours <= 256 );
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bit_depth = 8;
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color_type = PNG_COLOR_TYPE_PALETTE;
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}
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#else
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if( palette )
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g_warning( "%s",
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_( "ignoring palette (no quantisation support)" ) );
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#endif /*HAVE_IMAGEQUANT*/
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interlace_type = interlace ? PNG_INTERLACE_ADAM7 : PNG_INTERLACE_NONE;
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png_set_IHDR( write->pPng, write->pInfo,
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@ -994,7 +1110,66 @@ write_vips( Write *write,
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PNG_COMPRESSION_TYPE_BASE, data, length );
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}
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png_write_info( write->pPng, write->pInfo );
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#ifdef HAVE_IMAGEQUANT
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if( palette ) {
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VipsImage *im_quantised = vips_image_new_memory();
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VipsImage *im_palette = vips_image_new_memory();
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if( quantise_image( in, im_quantised, im_palette, colours, Q,
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dither ) ) {
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vips_error( "vips2png",
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"%s", _( "quantisation failed" ) );
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VIPS_UNREF( im_quantised );
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VIPS_UNREF( im_palette );
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return( -1 );
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}
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int palette_count = im_palette->Xsize;
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g_assert( palette_count <= PNG_MAX_PALETTE_LENGTH);
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png_color *png_palette = (png_color *) png_malloc( write->pPng,
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palette_count * sizeof( png_color ) );
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png_byte *png_trans = (png_byte *) png_malloc( write->pPng,
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palette_count * sizeof( png_byte ) );
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int trans_count = 0;
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for( i = 0; i < palette_count; i++ ) {
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png_byte *p = (png_byte *) VIPS_IMAGE_ADDR( im_palette,
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i, 0 );
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png_color *col = &png_palette[i];
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col->red = p[0];
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col->green = p[1];
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col->blue = p[2];
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png_trans[i] = p[3];
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if( p[3] != 255 )
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trans_count = i + 1;
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#ifdef DEBUG
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printf( "write_vips: palette[%d] %d %d %d %d\n",
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i + 1, p[0], p[1], p[2], p[3] );
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#endif /*DEBUG*/
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}
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#ifdef DEBUG
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printf( "write_vips: attaching %d color palette\n",
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palette_count );
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#endif /*DEBUG*/
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png_set_PLTE( write->pPng, write->pInfo, png_palette,
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palette_count );
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if( trans_count ) {
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#ifdef DEBUG
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printf( "write_vips: attaching %d alpha values\n",
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trans_count );
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#endif /*DEBUG*/
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png_set_tRNS( write->pPng, write->pInfo, png_trans,
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trans_count, NULL );
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}
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VIPS_UNREF( im_palette );
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VIPS_UNREF( write->memory );
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write->memory = im_quantised;
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in = write->memory;
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}
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#endif /*HAVE_IMAGEQUANT*/
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png_write_info( write->pPng, write->pInfo );
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/* If we're an intel byte order CPU and this is a 16bit image, we need
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* to swap bytes.
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@ -1027,7 +1202,8 @@ write_vips( Write *write,
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int
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vips__png_write( VipsImage *in, const char *filename,
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int compress, int interlace, const char *profile,
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VipsForeignPngFilter filter, gboolean strip )
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VipsForeignPngFilter filter, gboolean strip,
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gboolean palette, int colours, int Q, double dither )
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{
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Write *write;
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@ -1047,7 +1223,8 @@ vips__png_write( VipsImage *in, const char *filename,
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/* Convert it!
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*/
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if( write_vips( write,
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compress, interlace, profile, filter, strip ) ) {
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compress, interlace, profile, filter, strip, palette,
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colours, Q, dither ) ) {
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vips_error( "vips2png",
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||||
_( "unable to write \"%s\"" ), filename );
|
||||
|
||||
@ -1074,7 +1251,8 @@ user_write_data( png_structp png_ptr, png_bytep data, png_size_t length )
|
||||
int
|
||||
vips__png_write_buf( VipsImage *in,
|
||||
void **obuf, size_t *olen, int compression, int interlace,
|
||||
const char *profile, VipsForeignPngFilter filter, gboolean strip )
|
||||
const char *profile, VipsForeignPngFilter filter, gboolean strip,
|
||||
gboolean palette, int colours, int Q, double dither )
|
||||
{
|
||||
Write *write;
|
||||
|
||||
@ -1086,10 +1264,11 @@ vips__png_write_buf( VipsImage *in,
|
||||
/* Convert it!
|
||||
*/
|
||||
if( write_vips( write,
|
||||
compression, interlace, profile, filter, strip ) ) {
|
||||
compression, interlace, profile, filter, strip, palette,
|
||||
colours, Q, dither ) ) {
|
||||
vips_error( "vips2png",
|
||||
"%s", _( "unable to write to buffer" ) );
|
||||
|
||||
|
||||
return( -1 );
|
||||
}
|
||||
|
||||
|
||||
@ -196,7 +196,8 @@ if test_supported tiffload; then
|
||||
fi
|
||||
if test_supported pngload; then
|
||||
test_format $image png 0
|
||||
test_format $image png 0 [compression=9,interlace=1]
|
||||
test_format $image png 0 [compression=9,interlace=1]
|
||||
test_format $image png 90 [palette,colours=256,Q=100,dither=0,interlace=1]
|
||||
fi
|
||||
if test_supported jpegload; then
|
||||
test_format $image jpg 90
|
||||
|
||||
Loading…
Reference in New Issue
Block a user