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Fix color2int, int2color alpha handling (libgd alpha is 0-127)

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This commit is contained in:
Martijn Versteegh 2018-11-22 14:38:58 +01:00 committed by sfan5
parent 97c5dc0a83
commit f7b0d5c532
1 changed files with 2 additions and 2 deletions
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4
Image.cpp
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@ -19,7 +19,7 @@
static inline int color2int(Color c) static inline int color2int(Color c)
{ {
u8 a = 255 - c.a; u8 a = (255 - c.a) * gdAlphaMax / 255;
return (a << 24) | (c.r << 16) | (c.g << 8) | c.b; return (a << 24) | (c.r << 16) | (c.g << 8) | c.b;
} }
@ -31,7 +31,7 @@ static inline Color int2color(int c)
c2.g = (c >> 8) & 0xff; c2.g = (c >> 8) & 0xff;
c2.r = (c >> 16) & 0xff; c2.r = (c >> 16) & 0xff;
a = (c >> 24) & 0xff; a = (c >> 24) & 0xff;
c2.a = 255 - a; c2.a = 255 - (a*255 / gdAlphaMax);
return c2; return c2;
} }