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try revising spng FMT handling again

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This commit is contained in:
John Cupitt 2020-06-09 02:38:38 +01:00
parent f113e64515
commit ac96bb80b5
1 changed files with 23 additions and 29 deletions
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50
libvips/foreign/spngload.c
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@ -318,21 +318,33 @@ vips_foreign_load_png_header( VipsForeignLoad *load )
switch( png->ihdr.color_type ) {
case SPNG_COLOR_TYPE_GRAYSCALE:
case SPNG_COLOR_TYPE_GRAYSCALE_ALPHA:
png->bands = 1;
png->interpretation = VIPS_INTERPRETATION_B_W;
png->fmt = SPNG_FMT_PNG;
break;
case SPNG_COLOR_TYPE_GRAYSCALE_ALPHA:
png->bands = 2;
png->interpretation = VIPS_INTERPRETATION_B_W;
png->fmt = SPNG_FMT_PNG;
if( !spng_get_trns( png->ctx, &trns ) ) {
png->bands += 1;
/* Expand 1/2/4 bit images to 8 bit.
*/
if( png->ihdr.bit_depth < 8 )
png->fmt = SPNG_FMT_GA8;
}
else {
if( png->ihdr.bit_depth < 8 )
png->fmt = SPNG_FMT_G8;
}
break;
case SPNG_COLOR_TYPE_TRUECOLOR:
case SPNG_COLOR_TYPE_TRUECOLOR_ALPHA:
png->bands = 3;
png->interpretation = VIPS_INTERPRETATION_sRGB;
png->fmt = SPNG_FMT_PNG;
if( !spng_get_trns( png->ctx, &trns ) )
png->bands += 1;
break;
case SPNG_COLOR_TYPE_INDEXED:
@ -341,37 +353,19 @@ vips_foreign_load_png_header( VipsForeignLoad *load )
/* Expand indexed images to RGB8.
*/
if( !spng_get_trns( png->ctx, &trns ) ) {
png->bands += 1;
png->fmt = SPNG_FMT_RGBA8;
}
else
png->fmt = SPNG_FMT_RGB8;
break;
case SPNG_COLOR_TYPE_TRUECOLOR_ALPHA:
png->bands = 4;
png->interpretation = VIPS_INTERPRETATION_sRGB;
png->fmt = SPNG_FMT_PNG;
break;
default:
vips_error( class->nickname, "%s", _( "unknown color type" ) );
return( -1 );
}
if( !spng_get_trns( png->ctx, &trns ) ) {
if( png->ihdr.color_type == SPNG_COLOR_TYPE_TRUECOLOR ) {
if( png->ihdr.bit_depth == 16 )
png->fmt = SPNG_FMT_RGBA16;
else
png->fmt = SPNG_FMT_RGBA8;
}
else if( png->ihdr.color_type == SPNG_COLOR_TYPE_INDEXED )
png->fmt = SPNG_FMT_RGBA8;
else if( png->ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE ) {
if( png->ihdr.bit_depth == 16 )
png->fmt = SPNG_FMT_GA16;
else
png->fmt = SPNG_FMT_GA8;
}
}
if( png->ihdr.bit_depth == 16 ) {
png->format = VIPS_FORMAT_USHORT;
if( png->interpretation == VIPS_INTERPRETATION_B_W )