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|
{
if (mNoLock)
return;
// Special path that avoids generating cached native alpha data
if (!LockSurface())
return;
if (mSurface->format->BitsPerPixel == 16)
{
ushort* aDestPixelsRow = ((ushort*) mSurface->pixels) + (theY * mSurface->pitch/2) + theX;
SRC_TYPE* aSrcPixelsRow = aSrcBits +
(theSrcRect.mY * theImage->mWidth) + theSrcRect.mX;
uint32_t aRMask = mSurface->format->Rmask;
uint32_t aGMask = mSurface->format->Gmask;
uint32_t aBMask = mSurface->format->Bmask;
uint32_t aRRoundAdd = aRMask >> 1;
uint32_t aGRoundAdd = aGMask >> 1;
uint32_t aBRoundAdd = aBMask >> 1;
#ifdef OPTIMIZE_SOFTWARE_DRAWING
bool performNormalBlit = true;
if (gOptimizeSoftwareDrawing) // we know the ordering of the bit masks.
{
if (aGMask == 0x7E0)
{
performNormalBlit = false;
for (int y = 0; y < theSrcRect.mHeight; y++)
{
ushort* aDestPixels = aDestPixelsRow;
SRC_TYPE* aSrcPixels = aSrcPixelsRow;
for (int x = 0; x < theSrcRect.mWidth; x++)
{
uint32_t src = NEXT_SRC_COLOR;
uint32_t dest = *aDestPixels;
int a = src >> 27;
src = ((src & 0xFC00) << 11) + ((src >> 8) & 0xF800) + ((src >> 3) & 0x1F);
dest = (dest | (dest << 16)) & 0x7E0F81F;
dest += ((src - dest) * a) >> 5;
dest &= 0x7E0F81F;
*(aDestPixels++) = dest | (dest >> 16);
}
aDestPixelsRow += mSurface->pitch/2;
aSrcPixelsRow += theImage->mWidth;
}
}
else if (aGMask == 0x3E0)
{
performNormalBlit = false;
for (int y = 0; y < theSrcRect.mHeight; y++)
{
ushort* aDestPixels = aDestPixelsRow;
SRC_TYPE* aSrcPixels = aSrcPixelsRow;
for (int x = 0; x < theSrcRect.mWidth; x++)
{
uint32_t src = NEXT_SRC_COLOR;
uint32_t dest = *aDestPixels;
int a = src >> 27;
src = ((src & 0xF800) << 10) + ((src >> 9) & 0x7C00) + ((src >> 3) & 0x1F);
dest = (dest | (dest << 16)) & 0x3E07C1F;
dest += ((src - dest) * a) >> 5; // 1*d - a*d = (1-a)*d = oma*d :)
dest &= 0x3E07C1F;
*(aDestPixels++) = dest | (dest >> 16);
}
aDestPixelsRow += mSurface->pitch/2;
aSrcPixelsRow += theImage->mWidth;
}
}
}
if (performNormalBlit)
#endif
{
for (int y = 0; y < theSrcRect.mHeight; y++)
{
ushort* aDestPixels = aDestPixelsRow;
SRC_TYPE* aSrcPixels = aSrcPixelsRow;
for (int x = 0; x < theSrcRect.mWidth; x++)
{
uint32_t src = NEXT_SRC_COLOR;
uint32_t dest = *aDestPixels;
int a = src >> 24;
int oma = 256 - a;
*(aDestPixels++) =
(((((dest & aBMask) * oma) + (((src & 0x000000FF) * a * aBMask) >> 8) + aBRoundAdd) >> 8) & aBMask) +
(((((dest & aGMask) * oma) + ((((src & 0x0000FF00) >> 8) * a * aGMask) >> 8) + aGRoundAdd) >> 8) & aGMask) +
(((((dest & aRMask) * oma) + ((((src & 0x00FF0000) >> 16) * a * aRMask) >> 8) + aRRoundAdd) >> 8) & aRMask);
}
aDestPixelsRow += mSurface->pitch/2;
aSrcPixelsRow += theImage->mWidth;
}
}
}
else if (mSurface->format->BitsPerPixel == 32)
{
uint32_t* aDestPixelsRow = ((uint32_t*) mSurface->pixels) + (theY * mSurface->pitch/4) + theX;
SRC_TYPE* aSrcPixelsRow = aSrcBits +
(theSrcRect.mY * theImage->mWidth) + theSrcRect.mX;
uint32_t aRMask = mSurface->format->Rmask;
uint32_t aGMask = mSurface->format->Gmask;
uint32_t aBMask = mSurface->format->Bmask;
uint32_t aRRoundAdd = aRMask >> 1;
uint32_t aGRoundAdd = aGMask >> 1;
uint32_t aBRoundAdd = aBMask >> 1;
#ifdef OPTIMIZE_SOFTWARE_DRAWING
if (gOptimizeSoftwareDrawing)
{
for (int y = 0; y < theSrcRect.mHeight; y++)
{
uint32_t* aDestPixels = aDestPixelsRow;
SRC_TYPE* aSrcPixels = aSrcPixelsRow;
for (int x = 0; x < theSrcRect.mWidth; x++)
{
uint32_t src = NEXT_SRC_COLOR;
uint32_t dest = *aDestPixels;
int a = src >> 24;
uint32_t srctmp = src & 0xFF00FF;
uint32_t desttmp = dest & 0xFF00FF;
desttmp = (desttmp + (((srctmp - desttmp) * a) >> 8)) & 0xFF00FF;
src &= 0x00FF00;
dest &= 0x00FF00;
dest = (dest + (((src - dest) * a) >> 8)) & 0x00FF00;
*(aDestPixels++) = dest | desttmp;
}
aDestPixelsRow += mSurface->pitch/4;
aSrcPixelsRow += theImage->mWidth;
}
}
else
#endif
{
for (int y = 0; y < theSrcRect.mHeight; y++)
{
uint32_t* aDestPixels = aDestPixelsRow;
SRC_TYPE* aSrcPixels = aSrcPixelsRow;
for (int x = 0; x < theSrcRect.mWidth; x++)
{
uint32_t src = NEXT_SRC_COLOR;
uint32_t dest = *aDestPixels;
int a = src >> 24;
int oma = 256 - a;
*(aDestPixels++) =
(((((dest & aBMask) * oma) + ((((src & 0x000000FF) * a) >> 8) * aBMask) + aBRoundAdd) >> 8) & aBMask) +
(((((dest & aGMask) * oma) + (((((src & 0x0000FF00) >> 8) * a) >> 8) * aGMask) + aGRoundAdd) >> 8) & aGMask) +
(((((dest & aRMask) * oma) + (((((src & 0x00FF0000) >> 16) * a) >> 8) * aRMask) + aRRoundAdd) >> 8) & aRMask);
}
aDestPixelsRow += mSurface->pitch/4;
aSrcPixelsRow += theImage->mWidth;
}
}
}
UnlockSurface();
}
|
