/** \brief Convert an OpenEXR header to our own header representation.
*
* \param exrHeader - input header
* \param header - output header
*/
void convertHeader(const Imf::Header& exrHeader, CqTexFileHeader& header)
{
// Set width, height
const Imath::Box2i& dataBox = exrHeader.dataWindow();
header.setWidth(dataBox.max.x - dataBox.min.x+1);
header.setHeight(dataBox.max.y - dataBox.min.y+1);
// display window
const Imath::Box2i& displayBox = exrHeader.displayWindow();
header.set<Attr::DisplayWindow>( SqImageRegion(
displayBox.max.x - displayBox.min.x,
displayBox.max.y - displayBox.min.y,
displayBox.min.x - dataBox.min.x,
displayBox.min.y - dataBox.min.y) );
// Set tiling information ?
// Aspect ratio
header.set<Attr::PixelAspectRatio>(exrHeader.pixelAspectRatio());
TqChannelNameMap channelNameMap;
// Convert channel representation
const Imf::ChannelList& exrChannels = exrHeader.channels();
CqChannelList& channels = header.channelList();
for(Imf::ChannelList::ConstIterator i = exrChannels.begin();
i != exrChannels.end(); ++i)
{
// use lower case names for channels; OpenEXR uses upper case.
std::string chanName = i.name();
std::transform(chanName.begin(), chanName.end(), chanName.begin(),
::tolower);
channelNameMap[chanName] = i.name();
channels.addChannel( SqChannelInfo(chanName,
channelTypeFromExr(i.channel().type)) );
}
header.set<Attr::ExrChannelNameMap>(channelNameMap);
channels.reorderChannels();
// Set compresssion type
header.set<Attr::Compression>(exrCompressionToString(exrHeader.compression()));
}
void CqZInputFile::readHeader(std::istream& inStream, CqTexFileHeader& header)
{
const char zFileMagicNum[] = "Aqsis ZFile";
const TqInt magicNumSize = sizeof(zFileMagicNum)-1;
const TqInt versionNumSize = sizeof(AQSIS_VERSION_STR)-1;
std::vector<char> buf(max(magicNumSize, versionNumSize));
// Read in magic number
inStream.read(&buf[0], magicNumSize);
if(!std::equal(buf.begin(), buf.begin() + magicNumSize, zFileMagicNum)
|| inStream.gcount() != magicNumSize)
{
AQSIS_THROW_XQERROR(XqBadTexture, EqE_BadFile,
"Magic number missmatch in zfile");
}
// Read in Aqsis version. We require this to match the current aqsis version.
inStream.read(&buf[0], versionNumSize);
if(!std::equal(buf.begin(), buf.begin() + versionNumSize, AQSIS_VERSION_STR)
|| inStream.gcount() != versionNumSize)
{
AQSIS_THROW_XQERROR(XqBadTexture, EqE_Version,
"zfile was created with a different aqsis version");
}
// Read in map width
TqUint width = 0;
inStream.read(reinterpret_cast<char*>(&width), sizeof(width));
if(inStream.gcount() != sizeof(width))
AQSIS_THROW_XQERROR(XqBadTexture, EqE_BadFile,
"cannot read width from aqsis z-file");
// Read in map height
TqUint height = 0;
inStream.read(reinterpret_cast<char*>(&height), sizeof(height));
if(inStream.gcount() != sizeof(height))
AQSIS_THROW_XQERROR(XqBadTexture, EqE_BadFile,
"cannot read height from aqsis z-file");
// Read world to camera transformation matrix
CqMatrix worldToCamera;
worldToCamera.SetfIdentity(false);
inStream.read(reinterpret_cast<char*>(worldToCamera.pElements()), 16*sizeof(TqFloat));
if(inStream.gcount() != 16*sizeof(TqFloat))
AQSIS_THROW_XQERROR(XqBadTexture,EqE_BadFile,
"could not read world to camera matrix from aqsis z-file");
// Read world to screen transformation matrix
CqMatrix worldToScreen;
worldToScreen.SetfIdentity(false);
inStream.read(reinterpret_cast<char*>(worldToScreen.pElements()), 16*sizeof(TqFloat));
if(inStream.gcount() != 16*sizeof(TqFloat))
AQSIS_THROW_XQERROR(XqBadTexture, EqE_BadFile,
"could not read world to screen matrix from aqsis z-file");
// Save the read header attributes into the file header.
header.setWidth(width);
header.setHeight(height);
header.set<Attr::WorldToScreenMatrix>(worldToScreen);
header.set<Attr::WorldToCameraMatrix>(worldToCamera);
// Complete the header with some other attributes implied by the file format
header.set<Attr::TextureFormat>(TextureFormat_Shadow);
header.channelList().addChannel(SqChannelInfo("z", Channel_Float32));
}
