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Merge pull request #113 from delahee/patch-2

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MultiplyAlpha optimisation
This commit is contained in:
Joshua Granick
2014-03-20 23:34:05 -07:00
parent 5d241f3320 22336374bd
commit d9b3e37dee
1 changed files with 13 additions and 13 deletions
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26
project/src/renderer/common/SimpleSurface.cpp
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@@ -662,26 +662,26 @@ namespace lime {
if (mPixelFormat == pfAlpha)
return;
int a;
double multiply;
//converted to uint
//converted to float
//got rid of the premultiply so that we can allow compiler to pipeline computation
//cuz ARM instr have that mul load shift greatness
uint8 a;
float multiply = 0.0f;
int stride = mStride;
uint8 *dest = 0;
for (int y = 0; y < r.h; y++) {
dest = mBase + ((r.y + y) * stride) + (r.x << 2);
uint8 *dest = mBase + ((r.y + y) * mStride) + (r.x * 4);
for (int x = 0; x < r.w; x++) {
a = *(dest + 3);
if (a < 255.0) {
multiply = a / 255.0;
*dest = sgClamp0255[int((*dest) * multiply)];
*(dest + 1) = sgClamp0255[int(*(dest + 1) * multiply)];
*(dest + 2) = sgClamp0255[int(*(dest + 2) * multiply)];
}
*dest = (uint8) (*dest * a * 0.0039215686274509803921568627451f);
*(dest + 1) = (uint8) (*(dest + 1) * a * 0.0039215686274509803921568627451f);
*(dest + 2) = (uint8) (*(dest + 2) * a * 0.0039215686274509803921568627451f);
dest += 4;
}
}