CStr qCtx::ParseStr(const CStr &str) {
qStrBuf myTmp;
qStrReadBuf myIn(str);
Parse(&myIn, &myTmp);
return myTmp ? (CStr) myTmp : CStr::Empty;
}
Codec::DecodeResult EXRCodec::decode(DataStreamPtr& input) const
{
ImageData * imgData = new ImageData;
MemoryDataStreamPtr output;
try {
// Make a mutable clone of input to be able to change file pointer
MemoryDataStream myIn(input);
// Now we can simulate an OpenEXR file with that
O_IStream str(myIn, "SomeChunk.exr");
InputFile file(str);
Box2i dw = file.header().dataWindow();
int width = dw.max.x - dw.min.x + 1;
int height = dw.max.y - dw.min.y + 1;
int components = 3;
// Alpha channel present?
const ChannelList &channels = file.header().channels();
if(channels.findChannel("A"))
components = 4;
// Allocate memory
output.bind(new MemoryDataStream(width*height*components*4));
// Construct frame buffer
uchar *pixels = output->getPtr();
FrameBuffer frameBuffer;
frameBuffer.insert("R", // name
Slice (FLOAT, // type
((char *) pixels)+0, // base
4 * components, // xStride
4 * components * width)); // yStride
frameBuffer.insert("G", // name
Slice (FLOAT, // type
((char *) pixels)+4, // base
4 * components, // xStride
4 * components * width)); // yStride
frameBuffer.insert("B", // name
Slice (FLOAT, // type
((char *) pixels)+8, // base
4 * components, // xStride
4 * components * width)); // yStride
if(components==4) {
frameBuffer.insert("A", // name
Slice (FLOAT, // type
((char *) pixels)+12, // base
4 * components, // xStride
4 * components * width)); // yStride
}
file.setFrameBuffer (frameBuffer);
file.readPixels (dw.min.y, dw.max.y);
imgData->format = components==3 ? PF_FLOAT32_RGB : PF_FLOAT32_RGBA;
imgData->width = width;
imgData->height = height;
imgData->depth = 1;
imgData->size = width*height*components*4;
imgData->num_mipmaps = 0;
imgData->flags = 0;
} catch (const std::exception &exc) {
delete imgData;
throw(Exception(Exception::ERR_INTERNAL_ERROR,
"OpenEXR Error",
exc.what()));
}
DecodeResult ret;
ret.first = output;
ret.second = CodecDataPtr(imgData);
return ret;
}
