void CqMixedImageBuffer::compositeOver(const CqMixedImageBuffer& source,
const TqChannelNameMap& nameMap, TqInt topLeftX, TqInt topLeftY,
const std::string alphaName)
{
if(!source.channelList().hasChannel(alphaName))
{
copyFrom(source, nameMap, topLeftX, topLeftY);
}
else
{
// compute size and top left coords of region to copy.
TqInt copyWidth = 0;
TqInt destTopLeftX = 0;
TqInt srcTopLeftX = 0;
getCopyRegionSize(topLeftX, source.m_width, m_width,
srcTopLeftX, destTopLeftX, copyWidth);
TqInt copyHeight = 0;
TqInt destTopLeftY = 0;
TqInt srcTopLeftY = 0;
getCopyRegionSize(topLeftY, source.m_height, m_height,
srcTopLeftY, destTopLeftY, copyHeight);
// return if no overlap
if(copyWidth <= 0 || copyHeight <= 0)
return;
for(TqChannelNameMap::const_iterator i = nameMap.begin(), e = nameMap.end();
i != e; ++i)
{
channel(i->first, destTopLeftX, destTopLeftY, copyWidth, copyHeight)
->compositeOver(*source.channel(i->second, srcTopLeftX, srcTopLeftY, copyWidth, copyHeight),
*source.channel(alphaName, srcTopLeftX, srcTopLeftY, copyWidth, copyHeight));
}
}
}
void CqMixedImageBuffer::copyFrom(const CqMixedImageBuffer& source,
TqInt topLeftX, TqInt topLeftY)
{
if(source.m_channelList.numChannels() != m_channelList.numChannels())
AQSIS_THROW_XQERROR(XqInternal, EqE_Limit,
"Number of source and destination channels do not match");
// compute size and top left coords of region to copy.
TqInt copyWidth = 0;
TqInt destTopLeftX = 0;
TqInt srcTopLeftX = 0;
getCopyRegionSize(topLeftX, source.m_width, m_width,
srcTopLeftX, destTopLeftX, copyWidth);
TqInt copyHeight = 0;
TqInt destTopLeftY = 0;
TqInt srcTopLeftY = 0;
getCopyRegionSize(topLeftY, source.m_height, m_height,
srcTopLeftY, destTopLeftY, copyHeight);
// return if no overlap
if(copyWidth <= 0 || copyHeight <= 0)
return;
for(TqInt i = 0; i < m_channelList.numChannels(); ++i)
{
channel(i, destTopLeftX, destTopLeftY, copyWidth, copyHeight)
->copyFrom(*source.channel(i, srcTopLeftX, srcTopLeftY,
copyWidth, copyHeight));
}
}
