void ossimNitfFileHeaderV2_0::initializeDisplayLevels(std::istream& in)
{
// we will need to temporarily save the get pointer since
// initializeDisplayLevels changes it.
std::streampos saveTheGetPointer = in.tellg();
std::vector<ossimNitfImageOffsetInformation>::iterator imageOffsetList = theImageOffsetList.begin();
// allocate temporary space to store image headers
ossimNitfImageHeader* imageHeader = allocateImageHeader();
// clear the list
theDisplayInformationList.clear();
theImageRect = ossimDrect(0,0,0,0);
if(!imageHeader)
{
return;
}
ossim_uint32 idx = 0;
while(imageOffsetList != theImageOffsetList.end())
{
// position the get pointer in the input
// stream to the start of the image header
in.seekg((*imageOffsetList).theImageHeaderOffset, std::ios::beg);
// get the data
imageHeader->parseStream(in);
// create a union of rects. The result should be the image rect.
ossimDrect tempRect = imageHeader->getImageRect();
if((tempRect.width() > 1) &&
(tempRect.height() > 1))
{
theImageRect = theImageRect.combine(tempRect);
}
insertIntoDisplayInfoList(ossimNitfDisplayInfo(ossimString("IM"),
imageHeader->getDisplayLevel(),
idx));
++imageOffsetList;
++idx;
}
delete imageHeader;
imageHeader = 0;
// finally we reset the saved get state back
// to its original position
in.seekg(saveTheGetPointer, std::ios::beg);
}
ossimNitfImageHeader*
ossimNitfFileHeaderV2_1::getNewImageHeader(ossim_uint32 imageNumber,
std::istream& in)const
{
ossimNitfImageHeader *result = 0;
if( (getNumberOfImages() > 0) && (imageNumber < theImageOffsetList.size()) )
{
result = allocateImageHeader();
in.seekg(theImageOffsetList[imageNumber].theImageHeaderOffset, ios::beg);
result->parseStream(in);
}
else
{
#if 0
ossimNotify(ossimNotifyLevel_FATAL) << "FATAL ossimNitfFileHeaderV2_1::getNewImageHeader: "
<< "\nNo images in file or image number (" << imageNumber
<< ") is out of range!\n";
#endif
}
return result;
}
