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|
{
uint32_t* aDestPixelsRow = ((uint32_t*) GetBits()) + (theY * mWidth) + theX;
if ((mHasAlpha) || (mHasTrans) || (theColor != Color::White))
{
if (theColor == Color::White)
{
for (int y = 0; y < theSrcRect.mHeight; y++)
{
uint32_t* aDestPixels = aDestPixelsRow;
EACH_ROW;
for (int x = 0; x < theSrcRect.mWidth; x++)
{
uint32_t src = NEXT_SRC_COLOR;
uint32_t dest = *aDestPixels;
int a = src >> 24;
if (a != 0)
{
int aDestAlpha = dest >> 24;
int aNewDestAlpha = aDestAlpha + ((255 - aDestAlpha) * a) / 255;
a = 255 * a / aNewDestAlpha;
int oma = 256 - a;
// TODO: To avoid rounding problems for fully opaque pixels use (a+1) instead of a in the code below since we are dividing by 256
*(aDestPixels++) = (aNewDestAlpha << 24) |
#ifdef OPTIMIZE_SOFTWARE_DRAWING
((((dest & 0xFF00FF) * oma >> 8) + ((src & 0xFF00FF) * a >> 8)) & 0xFF00FF) |
((((dest & 0x00FF00) * oma >> 8) + ((src & 0x00FF00) * a >> 8)) & 0x00FF00);
#else
((((dest & 0x0000FF) * oma) >> 8) + (((src & 0x0000FF) * a) >> 8) & 0x0000FF) |
((((dest & 0x00FF00) * oma) >> 8) + (((src & 0x00FF00) * a) >> 8) & 0x00FF00) |
((((dest & 0xFF0000) * oma) >> 8) + (((src & 0xFF0000) * a) >> 8) & 0xFF0000);
#endif
}
else
aDestPixels++;
}
aDestPixelsRow += mWidth;
aSrcPixelsRow += theImage->mWidth;
}
}
else
{
int ca = theColor.mAlpha;
int cr = theColor.mRed;
int cg = theColor.mGreen;
int cb = theColor.mBlue;
#ifdef OPTIMIZE_SOFTWARE_DRAWING
bool performNormalBlit = true;
if (cr == cg && cg == cb)
{
performNormalBlit = false;
for (int y = 0; y < theSrcRect.mHeight; y++)
{
uint32_t* aDestPixels = aDestPixelsRow;
EACH_ROW;
for (int x = 0; x < theSrcRect.mWidth; x++)
{
uint32_t src = NEXT_SRC_COLOR;
uint32_t dest = *aDestPixels;
int a = ((src >> 24) * ca) / 255;
if (a != 0)
{
int aDestAlpha = dest >> 24;
int aNewDestAlpha = aDestAlpha + ((255 - aDestAlpha) * a) / 255;
a = 255 * a / aNewDestAlpha;
int oma = 256 - a;
*(aDestPixels++) = (aNewDestAlpha << 24) |
((((dest & 0xFF00FF) * oma >> 8) + ((((src & 0xFF00FF) * cr >> 8) & 0xFF00FF) * a >> 8)) & 0xFF00FF) |
((((dest & 0x00FF00) * oma >> 8) + ((src & 0x00FF00) * cr * a >> 16)) & 0x00FF00);
}
else
aDestPixels++;
}
aDestPixelsRow += mWidth;
aSrcPixelsRow += theImage->mWidth;
}
}
if (performNormalBlit)
#endif
{
for (int y = 0; y < theSrcRect.mHeight; y++)
{
uint32_t* aDestPixels = aDestPixelsRow;
EACH_ROW;
for (int x = 0; x < theSrcRect.mWidth; x++)
{
uint32_t src = NEXT_SRC_COLOR;
uint32_t dest = *aDestPixels;
int a = ((src >> 24) * ca) / 255;
if (a != 0)
{
int aDestAlpha = dest >> 24;
int aNewDestAlpha = aDestAlpha + ((255 - aDestAlpha) * a) / 255;
a = 255 * a / aNewDestAlpha;
int oma = 256 - a;
*(aDestPixels++) = (aNewDestAlpha << 24) |
((((dest & 0x0000FF) * oma) >> 8) + (((src & 0x0000FF) * a * cb) >> 16) & 0x0000FF) |
((((dest & 0x00FF00) * oma) >> 8) + (((src & 0x00FF00) * a * cg) >> 16) & 0x00FF00) |
((((dest & 0xFF0000) * oma) >> 8) + (((((src & 0xFF0000) * a) >> 8) * cr) >> 8) & 0xFF0000);
}
else
aDestPixels++;
}
aDestPixelsRow += mWidth;
aSrcPixelsRow += theImage->mWidth;
}
}
}
}
else
{
uchar* aSrcRLAlphaData = aSrcMemoryImage->GetRLAlphaData();
uchar* aRLAlphaDataRow = aSrcRLAlphaData + (theSrcRect.mY * theImage->mWidth) + theSrcRect.mX;
for (int y = 0; y < theSrcRect.mHeight; y++)
{
uint32_t* aDestPixels = aDestPixelsRow;
EACH_ROW;
uchar* aRLAlphaData = aRLAlphaDataRow;
for (int aSpanLeft = theSrcRect.mWidth; aSpanLeft > 0; )
{
uint32_t src = READ_SRC_COLOR;
uchar rl = *aRLAlphaData;
if (rl > aSpanLeft)
rl = aSpanLeft;
int oma = 256 - (src >> 24);
if (oma == 1) // Fully opaque
{
for (int i = 0; i < rl; i++)
*aDestPixels++ = NEXT_SRC_COLOR;
}
else if (oma == 256) // Fully transparent
{
aDestPixels += rl;
aSrcPtr += rl;
}
else // Partially transparent
{
#ifdef OPTIMIZE_SOFTWARE_DRAWING
int a = 256 - oma;
aSrcPtr++;
uint32_t dest = *aDestPixels;
*(aDestPixels++) = (0xFF000000) |
((((dest & 0xFF00FF) * oma >> 8) + ((src & 0xFF00FF) * a >> 8)) & 0xFF00FF) |
((((dest & 0x00FF00) * oma >> 8) + ((src & 0x00FF00) * a >> 8)) & 0x00FF00);
for (int i = 1; i < rl; i++)
{
uint32_t src = NEXT_SRC_COLOR;
int a = (src >> 24);
int oma = 256 - a;
uint32_t dest = *aDestPixels;
*(aDestPixels++) = (0xFF000000) |
((((dest & 0xFF00FF) * oma >> 8) + ((src & 0xFF00FF) * a >> 8)) & 0xFF00FF) |
((((dest & 0x00FF00) * oma >> 8) + ((src & 0x00FF00) * a >> 8)) & 0x00FF00);
}
#else
int a = 256 - oma;
aSrcPtr++;
uint32_t dest = *aDestPixels;
*(aDestPixels++) = (0xFF000000) |
((((dest & 0x0000FF) * oma) >> 8) + (((src & 0x0000FF) * a) >> 8) & 0x0000FF) |
((((dest & 0x00FF00) * oma) >> 8) + (((src & 0x00FF00) * a) >> 8) & 0x00FF00) |
((((dest & 0xFF0000) * oma) >> 8) + (((src & 0xFF0000) * a) >> 8) & 0xFF0000);
for (int i = 1; i < rl; i++)
{
uint32_t src = NEXT_SRC_COLOR;
int a = (src >> 24);
int oma = 256 - a;
uint32_t dest = *aDestPixels;
*(aDestPixels++) = (0xFF000000) |
((((dest & 0x0000FF) * oma) >> 8) + (((src & 0x0000FF) * a) >> 8) & 0x0000FF) |
((((dest & 0x00FF00) * oma) >> 8) + (((src & 0x00FF00) * a) >> 8) & 0x00FF00) |
((((dest & 0xFF0000) * oma) >> 8) + (((src & 0xFF0000) * a) >> 8) & 0xFF0000);
}
#endif
}
aRLAlphaData += rl;
aSpanLeft -= rl;
}
aDestPixelsRow += mWidth;
aSrcPixelsRow += theImage->mWidth;
aRLAlphaDataRow += theImage->mWidth;
}
}
}
|
