FGFS-4.1/OpenSceneGraph
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From Bryce Eldridge, "Here is an update for the TIFF plugin that includes the following features when writing out TIFF files:

Browse Source 
- Support for writing unsigned 16-bit images (GL_UNSIGNED_SHORT)
- Code to parse the options string for the following options:
-- Flag to turn off the compression. The PACKBITS compression type causes issues for me with some programs on Windows (Picasa for example).
-- Options to set the XRESOLUTION and YRESOLUTION tags (DPI) in the TIFF file.

Existing behavior (PACKBITS compression, DPI tags left at default) is preserved if the options string is not set.
"
This commit is contained in:
Robert Osfield 2011-05-26 16:26:50 +00:00
parent 909a4d1603
commit b8b368dc7c
1 changed files with 42 additions and 4 deletions
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46
src/osgPlugins/tiff/ReaderWriterTIFF.cpp
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@ -829,7 +829,7 @@ class ReaderWriterTIFF : public osgDB::ReaderWriter
return pOsgImage;
}
WriteResult::WriteStatus writeTIFStream(std::ostream& fout, const osg::Image& img) const
WriteResult::WriteStatus writeTIFStream(std::ostream& fout, const osg::Image& img, bool noCompression, float xResDPI, float yResDPI) const
{
//Code is based from the following article on CodeProject.com
//http://www.codeproject.com/bitmap/BitmapsToTiffs.asp
@ -887,6 +887,10 @@ class ReaderWriterTIFF : public osgDB::ReaderWriter
TIFFSetField(image, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_INT);
bitsPerSample = 16;
break;
case GL_UNSIGNED_SHORT:
TIFFSetField(image, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_UINT);
bitsPerSample = 16;
break;
default:
bitsPerSample = 8;
break;
@ -897,10 +901,17 @@ class ReaderWriterTIFF : public osgDB::ReaderWriter
TIFFSetField(image, TIFFTAG_BITSPERSAMPLE,bitsPerSample);
TIFFSetField(image, TIFFTAG_SAMPLESPERPIXEL,samplesPerPixel);
TIFFSetField(image, TIFFTAG_PHOTOMETRIC, photometric);
TIFFSetField(image, TIFFTAG_COMPRESSION, COMPRESSION_PACKBITS);
TIFFSetField(image, TIFFTAG_COMPRESSION, noCompression ? COMPRESSION_NONE : COMPRESSION_PACKBITS);
TIFFSetField(image, TIFFTAG_FILLORDER, FILLORDER_MSB2LSB);
TIFFSetField(image, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
if(xResDPI > 0 && yResDPI > 0)
{
TIFFSetField(image, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);
TIFFSetField(image, TIFFTAG_XRESOLUTION, xResDPI);
TIFFSetField(image, TIFFTAG_YRESOLUTION, yResDPI);
}
//uint32 rowsperstrip = TIFFDefaultStripSize(image, -1);
//TIFFSetField(image, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
@ -945,9 +956,36 @@ class ReaderWriterTIFF : public osgDB::ReaderWriter
return rr;
}
virtual WriteResult writeImage(const osg::Image& img,std::ostream& fout,const osgDB::ReaderWriter::Options* /*options*/) const
virtual WriteResult writeImage(const osg::Image& img,std::ostream& fout,const osgDB::ReaderWriter::Options* options) const
{
WriteResult::WriteStatus ws = writeTIFStream(fout,img);
bool noCompression = false;
float xResDPI = 0;
float yResDPI = 0;
if(options)
{
std::istringstream iss(options->getOptionString());
std::string opt;
while( iss >> opt)
{
if(opt == "no_compression")
{
noCompression = true;
}
else if(opt == "x_resolution")
{
iss >> xResDPI;
}
else if(opt == "y_resolution")
{
iss >> yResDPI;
}
}
}
WriteResult::WriteStatus ws = writeTIFStream(fout,img,noCompression,xResDPI,yResDPI);
return ws;
}