void RawBitmapUtil::Swizzle(uint8_t* pDst, const RawBitmap& src, const int dstIdx0, const int dstIdx1, const int dstIdx2, const int dstIdx3)
{
assert( pDst != nullptr );
assert( src.IsValid() );
assert( dstIdx0 != dstIdx1 );
assert( dstIdx0 != dstIdx2 );
assert( dstIdx0 != dstIdx3 );
assert( dstIdx1 != dstIdx2 );
assert( dstIdx1 != dstIdx3 );
assert( dstIdx2 != dstIdx3 );
const uint8_t*const pSrc = src.pContent;
const int srcWidth = src.Width;
const int srcHeight = src.Height;
const int srcStride = src.Stride;
int offset = 0;
for( int y=0; y<srcHeight; ++y )
{
for( int x=0; x<srcWidth; ++x )
{
const uint8_t b0 = pSrc[offset+(x * 4)+0];
const uint8_t b1 = pSrc[offset+(x * 4)+1];
const uint8_t b2 = pSrc[offset+(x * 4)+2];
const uint8_t b3 = pSrc[offset+(x * 4)+3];
pDst[offset+(x * 4)+dstIdx0] = b0;
pDst[offset+(x * 4)+dstIdx1] = b1;
pDst[offset+(x * 4)+dstIdx2] = b2;
pDst[offset+(x * 4)+dstIdx3] = b3;
}
offset += srcStride;
}
}
void RawBitmapUtil::Copy(RawBitmapEx& dstBitmap, const Point2& dstPos, const RawBitmap& srcBitmap, const Rectangle*const pSrcRect)
{
assert(dstBitmap.IsValid());
assert(dstPos.X >= 0);
assert(dstPos.Y >= 0);
assert(srcBitmap.IsValid());
const Rectangle srcRect = (pSrcRect != nullptr ? *pSrcRect : Rectangle(0, 0, srcBitmap.Width, srcBitmap.Height));
assert(srcRect.X() >= 0);
assert(srcRect.Y() >= 0);
assert(srcRect.Width() >= 0 && srcRect.Width() <= srcBitmap.Width);
assert(srcRect.Height() >= 0 && srcRect.Height() <= srcBitmap.Height);
// Validate that the rect fit on the target bitmap
assert((dstPos.X + srcRect.Width()) <= dstBitmap.Width);
assert((dstPos.Y + srcRect.Height()) <= dstBitmap.Height);
assert(dstBitmap.GetBytesPerPixel() == srcBitmap.GetBytesPerPixel());
const int numBytesPerPixel = dstBitmap.GetBytesPerPixel();
const int srcStride = srcBitmap.Stride;
const uint8_t* pSrc = srcBitmap.pContent + (srcStride * srcRect.Y()) + (numBytesPerPixel*srcRect.X());
const uint8_t*const pSrcEnd = pSrc + (srcStride * srcRect.Height());
const int numBytes = srcRect.Width() * numBytesPerPixel;
const int dstStride = dstBitmap.Stride;
uint8_t* pDst = dstBitmap.pContent + (dstStride * dstPos.Y) + (numBytesPerPixel * dstPos.X);
while( pSrc < pSrcEnd )
{
for( int x=0; x<numBytes; ++x )
{
pDst[x] = pSrc[x];
}
pSrc += srcStride;
pDst += dstStride;
}
}
