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Merge branch 'fix-bt709-oetf' into 'main'

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gsk: Fix wrong bt709_oetf

See merge request GNOME/gtk!7886
This commit is contained in:
Matthias Clasen
2024-11-01 00:27:59 +00:00
parent 7edb4ecddf b9f83265b6
commit 64dda64819
1 changed files with 10 additions and 4 deletions
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14
gsk/gpu/shaders/gskgpuconvertcicp.glsl
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@@ -161,19 +161,25 @@ run (out vec2 pos)
float
bt709_eotf (float v)
{
if (abs (v) < 0.081)
const float a = 1.099;
const float d = 0.0812;
if (abs (v) < d)
return v / 4.5;
else
return sign (v) * pow ((abs (v) + 0.099) / 1.099, 1.0/0.45);
return sign (v) * pow ((abs (v) + (a - 1.0)) / a, 1.0 / 0.45);
}
float
bt709_oetf (float v)
{
if (abs (v) < 0.081)
const float a = 1.099;
const float b = 0.018;
if (abs (v) < b)
return v * 4.5;
else
return 1.099 * sign (v) * (pow (abs (v), 0.45) - 0.099);
return sign (v) * (a * pow (abs (v), 0.45) - (a - 1.0));
}
float