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Image display: Render PNG images with correct colors that have a gamma value different from the sRGB gamma value set in their metadata

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Kovid Goyal 2020-08-11 22:52:50 +05:30
parent 95132b4fe1
commit a6ed54ed48
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1 changed files with 10 additions and 0 deletions
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10
kitty/png-reader.c
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@ -61,6 +61,16 @@ inflate_png_inner(png_read_data *d, const uint8_t *buf, size_t bufsz) {
d->height = png_get_image_height(png, info);
color_type = png_get_color_type(png, info);
bit_depth = png_get_bit_depth(png, info);
double image_gamma;
int intent;
if (png_get_sRGB(png, info, &intent)) {
// do nothing since we output sRGB
} else if (png_get_gAMA(png, info, &image_gamma)) {
if (image_gamma != 0 && fabs(image_gamma - 1.0/2.2) > 0.0001) png_set_gamma(png, 2.2, image_gamma);
} else {
// do nothing since we don't know what gamma the source image is in
// TODO: handle images with color profiles
}
// Ensure we get RGBA data out of libpng
if (bit_depth == 16) png_set_strip_16(png);