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fix: account for incorrect gamma-blending performed by compositor on transparent windows

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Fixes #6209
This commit is contained in:
Martin Wernstål 2023-04-27 18:35:06 +02:00
parent 289957ef1c
commit 9f41183628
1 changed files with 10 additions and 0 deletions
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10
kitty/cell_fragment.glsl
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@ -184,6 +184,12 @@ void main() {
vec4 fg = calculate_foreground(background);
#ifdef TRANSPARENT
final_color = alpha_blend_premul(fg, vec4_premul(background, bg_alpha));
// Adjust the transparent alpha-channel to account for incorrect
// gamma-blending performed by the compositor (true for at least wlroots,
// picom, GNOME, MacOS).
// This is the last pass:
final_color.a = linear2srgb(final_color.a);
#else
final_color = alpha_blend_premul(fg, background);
#endif
@ -207,6 +213,10 @@ void main() {
#ifdef FOREGROUND
final_color = calculate_foreground(); // pre-multiplied foreground
// This is the last pass, adjust alpha to compensate for gamma-incorrect
// blending in compositor:
final_color.a = linear2srgb(final_color.a);
#endif
}