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fix(flatten): fix flattening with background for 16bit transparent pngs

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This commit is contained in:
Nicolae Vartolomei 2016-09-12 13:33:25 +03:00
parent 1c7912751e
commit 21a7c308a6
1 changed files with 10 additions and 0 deletions
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10
vips.h
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@ -244,11 +244,21 @@ vips_webpsave_bridge(VipsImage *in, void **buf, size_t *len, int strip, int qual
);
}
int
vips_is_16bit (VipsInterpretation interpretation) {
return interpretation == VIPS_INTERPRETATION_RGB16 || interpretation == VIPS_INTERPRETATION_GREY16;
}
int
vips_flatten_background_brigde(VipsImage *in, VipsImage **out, double background[3]) {
background[0] *= 256;
background[1] *= 256;
background[2] *= 256;
VipsArrayDouble *vipsBackground = vips_array_double_new(background, 3);
return vips_flatten(in, out,
"background", vipsBackground,
"max_alpha", vips_is_16bit(in->Type) ? 65535.0 : 255.0,
NULL
);
}