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Update NukePaletteEffect for premultiplied alpha.

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This commit is contained in:
Paul Chote
2015-05-24 17:41:08 +01:00
parent 2cc125a3fa
commit 322285ef66
2 changed files with 16 additions and 2 deletions
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12
OpenRA.Game/Graphics/Util.cs
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@@ -118,6 +118,18 @@ namespace OpenRA.Graphics
return Color.FromArgb(c.A, (byte)(c.R * a + 0.5f), (byte)(c.G * a + 0.5f), (byte)(c.B * a + 0.5f));
}
public static Color PremultipliedColorLerp(float t, Color c1, Color c2)
{
// Colors must be lerped in a non-multiplied color space
var a1 = 255f / c1.A;
var a2 = 255f / c2.A;
return PremultiplyAlpha(Color.FromArgb(
(int)(t * c2.A + (1 - t) * c1.A),
(int)((byte)(t * a2 * c2.R + 0.5f) + (1 - t) * (byte)(a1 * c1.R + 0.5f)),
(int)((byte)(t * a2 * c2.G + 0.5f) + (1 - t) * (byte)(a1 * c1.G + 0.5f)),
(int)((byte)(t * a2 * c2.B + 0.5f) + (1 - t) * (byte)(a1 * c1.B + 0.5f))));
}
public static float[] IdentityMatrix()
{
return Exts.MakeArray(16, j => (j % 5 == 0) ? 1.0f : 0);