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faster gif save if interpalette-maxerror is huge

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If interpalette-maxerror is very large, we don't need to recompute the
palette for every frame, since we'll never choose a new palette.
This commit is contained in:
John Cupitt 2022-11-07 16:49:12 +00:00
parent 3ebb21491d
commit 557fc76634
1 changed files with 27 additions and 30 deletions
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57
libvips/foreign/cgifsave.c
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@ -300,8 +300,6 @@ vips_foreign_save_cgif_get_rgb_palette( VipsForeignSaveCgif *cgif,
}
}
/* Pick a quantiser for LOCAL mode.
*/
int
vips_foreign_save_cgif_pick_quantiser( VipsForeignSaveCgif *cgif,
VipsQuantiseImage *image,
@ -317,7 +315,7 @@ vips_foreign_save_cgif_pick_quantiser( VipsForeignSaveCgif *cgif,
return( -1 );
}
/* No global quantiser set up yet? Use this.
/* No global quantiser set up yet? Use this result.
*/
if( !cgif->quantisation_result ) {
#ifdef DEBUG_VERBOSE
@ -342,8 +340,9 @@ vips_foreign_save_cgif_pick_quantiser( VipsForeignSaveCgif *cgif,
const VipsQuantisePalette *prev = vips__quantise_get_palette(
cgif->previous_quantisation_result );
double global_diff = vips__cgif_compare_palettes( this, global );
double prev_diff = ( prev == global ) ? global_diff :
double global_diff =
vips__cgif_compare_palettes( this, global );
double prev_diff = (prev == global) ? global_diff :
vips__cgif_compare_palettes( this, prev );
#ifdef DEBUG_VERBOSE
@ -472,21 +471,18 @@ vips_foreign_save_cgif_write_frame( VipsForeignSaveCgif *cgif )
image = vips__quantise_image_create_rgba( cgif->attr,
cgif->frame_bytes, cgif->frame_width, cgif->frame_height, 0 );
/* Quantise.
*/
if( cgif->mode == VIPS_FOREIGN_SAVE_CGIF_MODE_GLOBAL ) {
/* Global mode: use the global palette.
*/
quantisation_result = cgif->quantisation_result;
use_local = FALSE;
}
else {
/* Local mode. Pick the global, this or previous palette.
if( cgif->mode == VIPS_FOREIGN_SAVE_CGIF_MODE_LOCAL ||
!cgif->quantisation_result ) {
/* Reoptimising each frame, or no global palette set up yet.
*/
if( vips_foreign_save_cgif_pick_quantiser( cgif,
image, &quantisation_result, &use_local ) )
return( -1 );
}
else {
quantisation_result = cgif->quantisation_result;
use_local = FALSE;
}
lp = vips__quantise_get_palette( quantisation_result );
/* If there's a transparent pixel, it's always first.
@ -700,17 +696,19 @@ vips_foreign_save_cgif_build( VipsObject *object )
/* Set up libimagequant.
*/
cgif->attr = vips__quantise_attr_create();
/* Limit the number of colours to 255, so there is always one index
* free for the transparency optimization.
/* Limit the number of colours to 255 so there is always one index
* free for transparency optimization.
*/
vips__quantise_set_max_colors( cgif->attr,
VIPS_MIN( 255, 1 << cgif->bitdepth ) );
vips__quantise_set_quality( cgif->attr, 0, 100 );
vips__quantise_set_speed( cgif->attr, 11 - cgif->effort );
/* Read the palette on the input, if any.
/* Read the palette on the input if we've not been asked to
* reoptimise.
*/
if( vips_image_get_typeof( cgif->in, "gif-palette" ) ) {
if( !cgif->reoptimise &&
vips_image_get_typeof( cgif->in, "gif-palette" ) ) {
if( vips_image_get_array_int( cgif->in, "gif-palette",
&cgif->palette, &cgif->n_colours ) )
return( -1 );
@ -722,17 +720,7 @@ vips_foreign_save_cgif_build( VipsObject *object )
}
}
/* LOCAL mode if there's no input palette, or reoptimise is set.
*/
if( cgif->reoptimise ||
!cgif->palette )
cgif->mode = VIPS_FOREIGN_SAVE_CGIF_MODE_LOCAL;
/* Set up GLOBAL mode. Init the quantisation_result we will
* use to dither frames with a fixed palette taken from the input
* image.
*/
if( cgif->mode == VIPS_FOREIGN_SAVE_CGIF_MODE_GLOBAL ) {
if( cgif->palette ) {
/* Make a fake image from the input palette, and quantise that.
* Add a zero pixel (transparent) in case the input image has
* transparency.
@ -758,6 +746,15 @@ vips_foreign_save_cgif_build( VipsObject *object )
VIPS_FREEF( vips__quantise_image_destroy, image );
}
/* Global mode if there's an input palette, or palette maxerror is
* huge.
*/
if( cgif->palette ||
cgif->interpalette_maxerror > 255 )
cgif->mode = VIPS_FOREIGN_SAVE_CGIF_MODE_GLOBAL;
else
cgif->mode = VIPS_FOREIGN_SAVE_CGIF_MODE_LOCAL;
if( vips_sink_disc( cgif->in,
vips_foreign_save_cgif_sink_disc, cgif ) )
return( -1 );