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sdpy helpers for alpha

This commit is contained in:
Adam D. Ruppe 2021-05-04 10:09:46 -04:00
parent c4c33da852
commit 534f9d9c35
1 changed files with 31 additions and 0 deletions
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31
color.d
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@ -217,6 +217,21 @@ struct Color {
nothrow pure @nogc
static Color brown() { return Color(128, 64, 0); }
nothrow pure @nogc
void premultiply() {
r = (r * a) / 255;
g = (g * a) / 255;
b = (b * a) / 255;
}
nothrow pure @nogc
void unPremultiply() {
r = cast(ubyte)(r * 255 / a);
g = cast(ubyte)(g * 255 / a);
b = cast(ubyte)(b * 255 / a);
}
/*
ubyte[4] toRgbaArray() {
return [r,g,b,a];
@ -447,6 +462,22 @@ struct Color {
}
}
void premultiplyBgra(ubyte[] bgra) pure @nogc @safe nothrow in { assert(bgra.length == 4); } do {
auto a = bgra[3];
bgra[2] = (bgra[2] * a) / 255;
bgra[1] = (bgra[1] * a) / 255;
bgra[0] = (bgra[0] * a) / 255;
}
void unPremultiplyRgba(ubyte[] rgba) pure @nogc @safe nothrow in { assert(rgba.length == 4); } do {
auto a = rgba[3];
rgba[0] = cast(ubyte)(rgba[0] * 255 / a);
rgba[1] = cast(ubyte)(rgba[1] * 255 / a);
rgba[2] = cast(ubyte)(rgba[2] * 255 / a);
}
unittest {
Color c = Color.fromString("#fff");
assert(c == Color.white);