gifsave: deprecate reoptimise, add reuse (#3213)
see https://github.com/libvips/libvips/discussions/3211
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John Cupitt
GitHub
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@ -25,6 +25,7 @@ master
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- add @wrap to vips_text()
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- GIF load supports truncated frames [tlsa]
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- EXIF support for PNG load and save
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- deprecate gifsave reoptimise, add reuse
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9/11/22 started 8.13.4
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- missing include in mosaic_fuzzer [ServOKio]
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@ -3,6 +3,8 @@
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* 22/8/21 lovell
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* 18/1/22 TheEssem
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* - fix change detector
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* 3/12/22
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* - deprecate reoptimise, add reuse
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*/
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/*
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@ -55,11 +57,6 @@
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#include <cgif.h>
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/* The modes we work in.
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*
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* VIPS_FOREIGN_SAVE_CGIF_MODE_GLOBAL:
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*
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* Each frame is dithered to single global colour table taken from the
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* input image "gif-palette" metadata item.
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*
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* VIPS_FOREIGN_SAVE_CGIF_MODE_LOCAL:
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*
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@ -67,8 +64,13 @@
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* frames with a local palette if they start to drift too far from the
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* first frame.
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*
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* We pick GLOBAL if "gif-palette" is set. We pick LOCAL if there is
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* no "gif-palette", or if @reoptimise is set.
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* VIPS_FOREIGN_SAVE_CGIF_MODE_GLOBAL:
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*
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* Each frame is dithered to single global colour table taken from the
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* input image "gif-palette" metadata item.
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*
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* We use LOCAL by default. We use GLOBAL if @reuse is set and there's
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* a palette attached to the image to be saved.
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*/
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typedef enum _VipsForeignSaveCgifMode {
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VIPS_FOREIGN_SAVE_CGIF_MODE_GLOBAL,
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@ -82,7 +84,7 @@ typedef struct _VipsForeignSaveCgif {
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int effort;
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int bitdepth;
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double interframe_maxerror;
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gboolean reoptimise;
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gboolean reuse;
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gboolean interlace;
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double interpalette_maxerror;
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VipsTarget *target;
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@ -137,6 +139,10 @@ typedef struct _VipsForeignSaveCgif {
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CGIF_Config cgif_config;
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int n_palettes_generated;
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/* Deprecated.
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*/
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gboolean reoptimise;
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} VipsForeignSaveCgif;
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typedef VipsForeignSaveClass VipsForeignSaveCgifClass;
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@ -707,7 +713,7 @@ vips_foreign_save_cgif_build( VipsObject *object )
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/* Read the palette on the input if we've not been asked to
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* reoptimise.
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*/
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if( !cgif->reoptimise &&
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if( cgif->reuse &&
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vips_image_get_typeof( cgif->in, "gif-palette" ) ) {
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if( vips_image_get_array_int( cgif->in, "gif-palette",
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&cgif->palette, &cgif->n_colours ) )
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@ -827,11 +833,11 @@ vips_foreign_save_cgif_class_init( VipsForeignSaveCgifClass *class )
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G_STRUCT_OFFSET( VipsForeignSaveCgif, interframe_maxerror ),
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0, 32, 0.0 );
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VIPS_ARG_BOOL( class, "reoptimise", 14,
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_( "Reoptimise palettes" ),
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_( "Reoptimise colour palettes" ),
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VIPS_ARG_BOOL( class, "reuse", 14,
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_( "Reuse palette" ),
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_( "Reuse palette from input" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsForeignSaveCgif, reoptimise ),
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G_STRUCT_OFFSET( VipsForeignSaveCgif, reuse ),
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FALSE );
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VIPS_ARG_DOUBLE( class, "interpalette_maxerror", 15,
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@ -848,6 +854,16 @@ vips_foreign_save_cgif_class_init( VipsForeignSaveCgifClass *class )
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G_STRUCT_OFFSET( VipsForeignSaveCgif, interlace ),
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FALSE );
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/* Not a good thing to have enabled by default since it can cause very
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* mysterious behaviour that varies with the input image.
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*/
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VIPS_ARG_BOOL( class, "reoptimise", 17,
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_( "Reoptimise palettes" ),
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_( "Reoptimise colour palettes" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT | VIPS_ARGUMENT_DEPRECATED,
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G_STRUCT_OFFSET( VipsForeignSaveCgif, reoptimise ),
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FALSE );
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}
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static void
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@ -857,7 +873,7 @@ vips_foreign_save_cgif_init( VipsForeignSaveCgif *gif )
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gif->effort = 7;
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gif->bitdepth = 8;
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gif->interframe_maxerror = 0.0;
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gif->reoptimise = FALSE;
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gif->reuse = FALSE;
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gif->interlace = FALSE;
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gif->interpalette_maxerror = 3.0;
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gif->mode = VIPS_FOREIGN_SAVE_CGIF_MODE_GLOBAL;
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@ -1042,7 +1058,7 @@ vips_foreign_save_cgif_buffer_init( VipsForeignSaveCgifBuffer *buffer )
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* * @effort: %gint, quantisation CPU effort
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* * @bitdepth: %gint, number of bits per pixel
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* * @interframe_maxerror: %gdouble, maximum inter-frame error for transparency
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* * @reoptimise: %gboolean, reoptimise colour palettes
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* * @reuse: %gboolean, reuse palette from input
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* * @interlace: %gboolean, write an interlaced (progressive) GIF
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* * @interpalette_maxerror: %gdouble, maximum inter-palette error for palette
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* reusage
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@ -1063,9 +1079,12 @@ vips_foreign_save_cgif_buffer_init( VipsForeignSaveCgifBuffer *buffer )
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* Pixels which don't change from frame to frame can be made transparent,
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* improving the compression rate. Default 0.
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*
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* If @reoptimise is TRUE, new palettes will be generated. Use
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* @interpalette_maxerror to set the threshold below which one of the previously
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* generated palettes will be reused.
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* Use @interpalette_maxerror to set the threshold below which the
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* previously generated palette will be reused.
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*
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* If @reuse is TRUE, the GIF will be saved with a single global
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* palette taken from the metadata in @in, and no new palette optimisation
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* will be done.
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*
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* If @interlace is TRUE, the GIF file will be interlaced (progressive GIF).
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* These files may be better for display over a slow network
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@ -1101,7 +1120,7 @@ vips_gifsave( VipsImage *in, const char *filename, ... )
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* * @effort: %gint, quantisation CPU effort
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* * @bitdepth: %gint, number of bits per pixel
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* * @interframe_maxerror: %gdouble, maximum inter-frame error for transparency
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* * @reoptimise: %gboolean, reoptimise colour palettes
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* * @reuse: %gboolean, reuse palette from input
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* * @interlace: %gboolean, write an interlaced (progressive) GIF
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* * @interpalette_maxerror: %gdouble, maximum inter-palette error for palette
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* reusage
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@ -1156,7 +1175,7 @@ vips_gifsave_buffer( VipsImage *in, void **buf, size_t *len, ... )
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* * @effort: %gint, quantisation CPU effort
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* * @bitdepth: %gint, number of bits per pixel
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* * @interframe_maxerror: %gdouble, maximum inter-frame error for transparency
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* * @reoptimise: %gboolean, reoptimise colour palettes
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* * @reuse: %gboolean, reuse palette from input
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* * @interlace: %gboolean, write an interlaced (progressive) GIF
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* * @interpalette_maxerror: %gdouble, maximum inter-palette error for palette
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* reusage
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