ZDCPixmap sPixmap(ZRef<CGImageRef> iImageRef)
{
if (not iImageRef)
{}
else if (ZRef<CGDataProviderRef,false> theProvider = ::CGImageGetDataProvider(iImageRef))
{}
else if (ZRef<CFDataRef,false> theDataRef = sAdopt& ::CGDataProviderCopyData(theProvider))
{}
else
{
const PixvalDesc thePixvalDesc(
::CGImageGetBitsPerPixel(iImageRef), ZCONFIG_Endian != ZCONFIG_Endian_Big);
const RasterDesc theRasterDesc(
thePixvalDesc,
::CGImageGetBytesPerRow(iImageRef),
::CGImageGetHeight(iImageRef),
false);
ZRef<PixmapRaster> thePixmapRaster = new PixmapRaster(theRasterDesc, iImageRef, theDataRef);
// Figure out mask
const size_t theBPC = ::CGImageGetBitsPerComponent(iImageRef);
const CGImageAlphaInfo theAI = ::CGImageGetAlphaInfo(iImageRef);
const uint32 theMask = (1 << theBPC) - 1;
uint32 theStart = theMask;
uint32 theA;
if (theAI & 1)
{
theA = theMask;
theStart = theMask << theBPC;
}
else if (0 == (theAI & 6) || 6 == (theAI & 6))
{
theA = 0;
}
else
{
theA = theMask << (theBPC * 3);
}
const uint32 theB = theStart;
const uint32 theG = theB << theBPC;
const uint32 theR = theG << theBPC;
const PixelDesc thePixelDesc(theR, theG, theB, theA);
return ZDCPixmapRep::sCreate(
thePixmapRaster,
sRectPOD(::CGImageGetWidth(iImageRef),
thePixmapRaster->GetRasterDesc().fRowCount),
thePixelDesc);
}
return ZDCPixmap();
}
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());
}
}
}