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REVIEWED: ColorAlphaBlend(), integers-version, optimized #1218

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raysan5 2020-06-20 19:57:09 +02:00
parent 5a862bce29
commit 7ed7116e27
1 changed files with 42 additions and 11 deletions
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49
src/textures.c
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@ -3386,18 +3386,48 @@ Color ColorAlpha(Color color, float alpha)
// Returns src alpha-blended into dst color with tint
Color ColorAlphaBlend(Color dst, Color src, Color tint)
{
Color out = WHITE;
// TODO: Compute tint color over source properly (before alpha blending)
//#define COLORALPHABLEND_FLOAT
#define COLORALPHABLEND_INTEGERS
#if defined(COLORALPHABLEND_INTEGERS)
// Apply color tint to source color
// NOTE: Some problems when aplying source tinting
//src.r = (unsigned char)(((unsigned int)src.r*(unsigned int)tint.r) >> 8);
//src.g = (unsigned char)(((unsigned int)src.g*(unsigned int)tint.g) >> 8);
//src.b = (unsigned char)(((unsigned int)src.b*(unsigned int)tint.b) >> 8);
//src.a = (unsigned char)(((unsigned int)src.a*255 + (unsigned int)tint.a*(255 - src.a)) >> 8);
if (src.a == 0) out = dst;
else if (src.a == 255) out = src;
else
{
unsigned int alpha = (unsigned int)src.a + 1; // We are shifting by 8 (dividing by 256), so we need to take that excess into account
out.a = (unsigned char)(((unsigned int)alpha*256 + (unsigned int)dst.a*(256 - alpha)) >> 8);
if (out.a > 0)
{
out.r = (unsigned char)((((unsigned int)src.r*alpha*256 + (unsigned int)dst.r*(unsigned int)dst.a*(256 - alpha))/out.a) >> 8);
out.g = (unsigned char)((((unsigned int)src.g*alpha*256 + (unsigned int)dst.g*(unsigned int)dst.a*(256 - alpha))/out.a) >> 8);
out.b = (unsigned char)((((unsigned int)src.b*alpha*256 + (unsigned int)dst.b*(unsigned int)dst.a*(256 - alpha))/out.a) >> 8);
}
}
#endif
#if defined(COLORALPHABLEND_FLOAT)
// Apply color tint to source color
//fsrc.x *= ftint.x; fsrc.y *= ftint.y; fsrc.z *= ftint.z; fsrc.w *= ftint.w;
if (src.a == 0) out = dst;
else if (src.a == 255) out = src;
else
{
Vector4 fdst = ColorNormalize(dst);
Vector4 fsrc = ColorNormalize(src);
Vector4 ftint = ColorNormalize(tint);
Vector4 fout = { 0.0f };
// Apply color tint to source image
fsrc.x *= ftint.x; fsrc.y *= ftint.y; fsrc.z *= ftint.z; fsrc.w *= ftint.w;
if (fsrc.w <= 0.0f) fout = fdst;
else if (fsrc.w >= 1.0f) fout = fsrc;
else
{
fout.w = fsrc.w + fdst.w*(1.0f - fsrc.w);
if (fout.w > 0.0f)
@ -3406,9 +3436,10 @@ Color ColorAlphaBlend(Color dst, Color src, Color tint)
fout.y = (fsrc.y*fsrc.w + fdst.y*fdst.w*(1 - fsrc.w))/fout.w;
fout.z = (fsrc.z*fsrc.w + fdst.z*fdst.w*(1 - fsrc.w))/fout.w;
}
}
Color out = { (unsigned char)(fout.x*255.0f), (unsigned char)(fout.y*255.0f), (unsigned char)(fout.z*255.0f), (unsigned char)(fout.w*255.0f) };
out = (Color){ (unsigned char)(fout.x*255.0f), (unsigned char)(fout.y*255.0f), (unsigned char)(fout.z*255.0f), (unsigned char)(fout.w*255.0f) };
}
#endif
return out;
}