ZDCPixmapRaster_Simple::ZDCPixmapRaster_Simple(ZRef<ZDCPixmapRaster> iOther)
: ZDCPixmapRaster(iOther->GetRasterDesc())
{
fCanModify = true;
const size_t bufferSize = fRasterDesc.fRowBytes * fRasterDesc.fRowCount;
// Oversize the buffer slightly, to allow for some code in ZDCPixmapBlit that
// may *read* past the end of a buffer in some situations.
fBuffer = new uint8[bufferSize + 4];
fBaseAddress = fBuffer;
sMemCopy(fBuffer, iOther->GetBaseAddress(), bufferSize);
}
static void sReadImageData(const ZStreamR& iStream,
bool iInterlaced, const ZRect& iBounds, ZRef<ZDCPixmapRaster> ioRaster)
{
uint8 initialCodeSize = iStream.ReadUInt8();
StreamR_Chunk theSIC(iStream);
ZStreamR_LZWDecode theSILZW(initialCodeSize, theSIC);
ZDCPixmapNS::PixvalDesc sourcePixvalDesc(8, true);
void* destBaseAddress = ioRaster->GetBaseAddress();
ZDCPixmapNS::RasterDesc destRasterDesc = ioRaster->GetRasterDesc();
vector<uint8> theRowBufferVector(iBounds.Width());
void* theRowBuffer = &theRowBufferVector[0];
if (iInterlaced)
{
for (int pass = 0; pass < 4; ++pass)
{
for (ZCoord currentY = iBounds.top + sInterlaceStart[pass];
currentY < iBounds.bottom; currentY += sInterlaceIncrement[pass])
{
theSILZW.Read(theRowBuffer, iBounds.Width());
void* destRowAddress = destRasterDesc.CalcRowAddress(destBaseAddress, currentY);
ZDCPixmapNS::sBlitRowPixvals(theRowBuffer, sourcePixvalDesc, 0,
destRowAddress, destRasterDesc.fPixvalDesc, iBounds.left,
iBounds.Width());
}
}
}
else
{
for (ZCoord currentY = iBounds.top; currentY < iBounds.bottom; ++currentY)
{
theSILZW.Read(theRowBuffer, iBounds.Width());
void* destRowAddress = destRasterDesc.CalcRowAddress(destBaseAddress, currentY);
ZDCPixmapNS::sBlitRowPixvals(theRowBuffer, sourcePixvalDesc, 0,
destRowAddress, destRasterDesc.fPixvalDesc, iBounds.left,
iBounds.Width());
}
}
}
