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nsgifload: add "palette-bit-depth" header (#2828)

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Sergey Alexandrovich 2022-06-01 17:27:10 +06:00 committed by GitHub
parent 6260a37136
commit c9b5b8c197
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 25 additions and 4 deletions
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29
libvips/foreign/nsgifload.c
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@ -248,6 +248,9 @@ vips_foreign_load_nsgif_set_header( VipsForeignLoadNsgif *gif,
{
double array[3];
const uint8_t *bg;
size_t entries;
uint32_t table[NSGIF_MAX_COLOURS];
int colours;
VIPS_DEBUG_MSG( "vips_foreign_load_nsgif_set_header:\n" );
@ -299,14 +302,32 @@ vips_foreign_load_nsgif_set_header( VipsForeignLoadNsgif *gif,
* metadata.
*/
if( !gif->local_palette ) {
size_t entries;
uint32_t table[NSGIF_MAX_COLOURS];
nsgif_global_palette( gif->anim, table, &entries );
vips_image_set_array_int( image, "gif-palette",
(const int *) table, entries );
(const int *) table, entries );
colours = entries;
} else {
int i;
colours = 0;
if( gif->info->global_palette ) {
nsgif_global_palette( gif->anim, table, &entries );
colours = entries;
}
for( i = 0; i < gif->info->frame_count; i++ ) {
if( nsgif_local_palette( gif->anim, i, table,
&entries) ) {
colours = VIPS_MAX(colours, entries);
}
}
}
vips_image_set_int( image, "palette-bit-depth",
ceil( log2( colours ) ) );
return( 0 );
}