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{
ulong* aDestBits = GetBits();
int aSrcRowWidth = aSrcMemoryImage->GetWidth();
int aSrcXI = (int) floor(theSrcRect.mX);
int aSrcYI = (int) floor(theSrcRect.mY);
int aSrcWidthI = (int) ceil(theSrcRect.mWidth + (theSrcRect.mX - aSrcXI));
int aSrcHeightI = (int) ceil(theSrcRect.mHeight + (theSrcRect.mY - aSrcYI));
if (aSrcXI<0) aSrcXI = 0;
if (aSrcYI<0) aSrcYI = 0;
if (aSrcXI + aSrcWidthI > theImage->mWidth) aSrcWidthI = theImage->mWidth - aSrcXI;
if (aSrcYI + aSrcHeightI > theImage->mHeight) aSrcHeightI = theImage->mHeight - aSrcYI;
if (aSrcWidthI<=0 || aSrcHeightI<=0)
return;
int aTempDestWidth = theDestRect.mWidth+4;
int aTempDestHeight = theDestRect.mHeight+4;
// For holding horizontally resized pixels not vertically (yet)
ulong* aNewHorzPixels = new ulong[aTempDestWidth*aSrcHeightI*4];
ulong* aNewHorzPixelsEnd = aNewHorzPixels + (aTempDestWidth*aSrcHeightI*4);
ZeroMemory(aNewHorzPixels, aTempDestWidth*aSrcHeightI*4*4);
int aSrcImageWidth = theImage->GetWidth();
if (theSrcRect.mWidth >= theDestRect.mWidth)
{
double aDestXFactor = theDestRect.mWidth / theSrcRect.mWidth;
double aDestXOffset = 1.0 + (aSrcXI - theSrcRect.mX) * aDestXFactor;
// Shrinking
for (int aSrcX = 0; aSrcX < aSrcWidthI; aSrcX++)
{
double aDestX1 = aDestXFactor * aSrcX + aDestXOffset;
double aDestX2 = aDestX1 + aDestXFactor;
int aDestXI1 = (int) aDestX1;
int aDestXI2 = (int) aDestX2;
SRC_TYPE* s1 = &aSrcBits[aSrcYI*aSrcRowWidth + aSrcXI+aSrcX];
if (aDestXI1 == aDestXI2)
{
ulong* d = &aNewHorzPixels[aDestXI1*4];
int aFactor = (int) (257 * aDestXFactor);
for (int aSrcY = 0; aSrcY < aSrcHeightI; aSrcY++)
{
ulong pixel = READ_COLOR(s1);
*d++ += aFactor * ((pixel ) & 0xFF);
*d++ += aFactor * ((pixel >> 8) & 0xFF);
*d++ += aFactor * ((pixel >> 16) & 0xFF);
*d++ += aFactor * ((pixel >> 24) & 0xFF);
DBG_ASSERTE(d <= aNewHorzPixelsEnd);
d += aTempDestWidth*4 - 4;
s1 += aSrcRowWidth;
}
}
else
{
int aFactor1 = (int) (257 * (aDestXI2 - aDestX1));
int aFactor2 = (int) (257 * (aDestX2 - aDestXI2));
ulong* d = &aNewHorzPixels[aDestXI1*4];
for (int aSrcY = 0; aSrcY < aSrcHeightI; aSrcY++)
{
ulong pixel = READ_COLOR(s1);
*d++ += aFactor1 * ((pixel ) & 0xFF);
*d++ += aFactor1 * ((pixel >> 8) & 0xFF);
*d++ += aFactor1 * ((pixel >> 16) & 0xFF);
*d++ += aFactor1 * ((pixel >> 24) & 0xFF);
*d++ += aFactor2 * ((pixel ) & 0xFF);
*d++ += aFactor2 * ((pixel >> 8) & 0xFF);
*d++ += aFactor2 * ((pixel >> 16) & 0xFF);
*d++ += aFactor2 * ((pixel >> 24) & 0xFF);
DBG_ASSERTE(d <= aNewHorzPixelsEnd);
d += aTempDestWidth*4 - 8;
s1 += aSrcRowWidth;
}
}
}
}
else
{
double aSrcXFactor;
if (theDestRect.mWidth != 1)
aSrcXFactor = (theSrcRect.mWidth - 1) / (theDestRect.mWidth - 1);
else
aSrcXFactor = (theSrcRect.mWidth) / (theDestRect.mWidth);
for (int aDestX = 1; aDestX < aTempDestWidth-1; aDestX++)
{
ulong* d = &aNewHorzPixels[aDestX*4];
double aSrcX = (aDestX - 1)*aSrcXFactor + theSrcRect.mX;
int aSrcXI = (int) aSrcX;
int aFactor1 = (int) (257 * (1.0 - (aSrcX - aSrcXI)));
int aFactor2 = (int) (257 - aFactor1);
SRC_TYPE* s = &aSrcBits[aSrcYI*aSrcRowWidth+aSrcXI];
for (int aDestY = 0; aDestY < aSrcHeightI; aDestY++)
{
ulong pixel1 = READ_COLOR(s++);
ulong pixel2 = READ_COLOR(s);
*d++ = (aFactor1 * ((pixel1 ) & 0xFF)) + (aFactor2 * ((pixel2 ) & 0xFF));
*d++ = (aFactor1 * ((pixel1 >> 8) & 0xFF)) + (aFactor2 * ((pixel2 >> 8) & 0xFF));
*d++ = (aFactor1 * ((pixel1 >> 16) & 0xFF)) + (aFactor2 * ((pixel2 >> 16) & 0xFF));
*d++ = (aFactor1 * ((pixel1 >> 24) & 0xFF)) + (aFactor2 * ((pixel2 >> 24) & 0xFF));
DBG_ASSERTE(d <= aNewHorzPixelsEnd);
d += aTempDestWidth*4 - 4;
s += aSrcRowWidth - 1;
}
}
}
ulong* aNewPixels = new ulong[aTempDestWidth*aTempDestHeight*4];
ulong* aNewPixelsEnd = aNewPixels + (aTempDestWidth*aTempDestHeight*4);
ZeroMemory(aNewPixels, aTempDestWidth*aTempDestHeight*4*4);
// Now resize vertically
if (theSrcRect.mHeight >= theDestRect.mHeight)
{
double aDestYFactor = theDestRect.mHeight / theSrcRect.mHeight;
double aDestYOffset = 1.0 + (aSrcYI - theSrcRect.mY) * aDestYFactor;
for (int aSrcY = 0; aSrcY < aSrcHeightI; aSrcY++)
{
double aDestY1 = aDestYFactor * aSrcY + aDestYOffset;
double aDestY2 = aDestY1 + aDestYFactor;
int aDestYI1 = (int) floor(aDestY1);
int aDestYI2 = (int) floor(aDestY2);
ulong* s = &aNewHorzPixels[aSrcY*aTempDestWidth*4];
if (aDestYI1 == aDestYI2)
{
ulong* d = &aNewPixels[aDestYI1*aTempDestWidth*4];
int aFactor = (int) (256 * aDestYFactor);
for (int aSrcX = 0; aSrcX < aTempDestWidth; aSrcX++)
{
*d++ += aFactor * *s++;
*d++ += aFactor * *s++;
*d++ += aFactor * *s++;
*d++ += aFactor * *s++;
}
DBG_ASSERTE(d <= aNewPixelsEnd);
}
else
{
int aFactor1 = (int) (256 * (aDestYI2 - aDestY1));
int aFactor2 = (int) (256 * (aDestY2 - aDestYI2));
ulong* d1 = &aNewPixels[aDestYI1*aTempDestWidth*4];
ulong* d2 = &aNewPixels[aDestYI2*aTempDestWidth*4];
for (int aSrcX = 0; aSrcX < aTempDestWidth; aSrcX++)
{
*d1++ += aFactor1 * *s;
*d2++ += aFactor2 * *s++;
*d1++ += aFactor1 * *s;
*d2++ += aFactor2 * *s++;
*d1++ += aFactor1 * *s;
*d2++ += aFactor2 * *s++;
*d1++ += aFactor1 * *s;
*d2++ += aFactor2 * *s++;
}
DBG_ASSERTE(d1 <= aNewPixelsEnd);
DBG_ASSERTE(d2 <= aNewPixelsEnd);
}
}
}
else
{
double aSrcYFactor;
if (theDestRect.mHeight != 1)
aSrcYFactor = (theSrcRect.mHeight - 1) / (theDestRect.mHeight - 1);
else
aSrcYFactor = (theSrcRect.mHeight) / (theDestRect.mHeight);
for (int aDestY = 1; aDestY < theDestRect.mHeight + 1; aDestY++)
{
ulong* d = &aNewPixels[(aDestY*aTempDestWidth+1)*4];
double aSrcY = (aDestY-1)*aSrcYFactor + (theSrcRect.mY - ((int) theSrcRect.mY));
int aSrcYI = (int) aSrcY;
int aFactor1 = (int) (256 * (1.0 - (aSrcY - aSrcYI)));
int aFactor2 = 256 - aFactor1;
ulong* s1 = &aNewHorzPixels[(aSrcYI*aTempDestWidth+1)*4];
ulong* s2;
if (aSrcYI == aSrcHeightI - 1)
s2 = s1;
else
s2 = &aNewHorzPixels[((aSrcYI+1)*aTempDestWidth+1)*4];
for (int aDestX = 1; aDestX < aTempDestWidth-1; aDestX++)
{
*d++ = (aFactor1 * *s1++) + (aFactor2 * *s2++);
*d++ = (aFactor1 * *s1++) + (aFactor2 * *s2++);
*d++ = (aFactor1 * *s1++) + (aFactor2 * *s2++);
*d++ = (aFactor1 * *s1++) + (aFactor2 * *s2++);
}
}
}
for (int y = 0; y < theDestRect.mHeight; y++)
{
ulong* aDestPixels = &aDestBits[(theDestRect.mY+y)*mWidth+theDestRect.mX];
for (int x = 0; x < theDestRect.mWidth; x++)
{
ulong *p = &aNewPixels[((y+1)*aTempDestWidth+x+1)*4];
int b = (*p++) >> 16;
int g = (*p++) >> 16;
int r = (*p++) >> 16;
int a = (*p++) >> 16;
/*aDestBits[(theDestRect.mY+y)*mWidth+theDestRect.mX+x] =
(r) | (g << 8) | (b << 16) | (a << 24);*/
if (a != 0)
{
ulong dest = *aDestPixels;
int aDestAlpha = dest >> 24;
int aNewDestAlpha = aDestAlpha + ((255 - aDestAlpha) * a) / 255;
//a = 255 * a / (a + aDestAlpha);
int oma = 256 - a;
DBG_ASSERTE(aDestPixels < aDestEnd);
*(aDestPixels++) = (aNewDestAlpha << 24) |
(((((dest & 0x0000FF) * oma) >> 8) & 0x0000FF) + (((b * a) >> 8))) |
(((((dest & 0x00FF00) * oma) >> 8) & 0x00FF00) + (((g * a) >> 8) << 8)) |
(((((dest & 0xFF0000) * oma) >> 8) & 0xFF0000) + (((r * a) >> 8) << 16));
}
else
aDestPixels++;
}
}
delete[] aNewPixels;
delete[] aNewHorzPixels;
}
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