From 360e7629d06094d3509ac6ecc1e05a71ecc9781d Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 11 Jul 2008 19:43:01 +0000
Subject: [PATCH] From Christophe Loustaunau, "For our application, we need to
 write tiff file in floats. I have change a little bit the readerWritterTiff :
 It check the data type of the image ( img.getDataType() ) and if it's
 GL_FLOAT :It save the tiff with float values. Otherwise it does the same
 thing as before."

---
 src/osgPlugins/tiff/ReaderWriterTIFF.cpp | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/osgPlugins/tiff/ReaderWriterTIFF.cpp b/src/osgPlugins/tiff/ReaderWriterTIFF.cpp
index 295f6c2b9..b6372ab75 100644
--- a/src/osgPlugins/tiff/ReaderWriterTIFF.cpp
+++ b/src/osgPlugins/tiff/ReaderWriterTIFF.cpp
@@ -689,6 +689,7 @@ class ReaderWriterTIFF : public osgDB::ReaderWriter
 
             TIFF *image;
             int samplesPerPixel;
+            int bitsPerSample;
             uint16 photometric;
 
             image = TIFFClientOpen("outputstream", "w", (thandle_t)&fout,
@@ -728,9 +729,20 @@ class ReaderWriterTIFF : public osgDB::ReaderWriter
                     break;
             }
 
+            switch(img.getDataType()){
+                case GL_FLOAT:
+                    TIFFSetField(image, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_IEEEFP);
+                    TIFFSetField(image, TIFFTAG_ROWSPERSTRIP, 1);
+                    bitsPerSample = 32;
+                    break;
+                default:
+                    bitsPerSample = 8;
+                    break;
+            }
+
             TIFFSetField(image, TIFFTAG_IMAGEWIDTH,img.s());
             TIFFSetField(image, TIFFTAG_IMAGELENGTH,img.t());
-            TIFFSetField(image, TIFFTAG_BITSPERSAMPLE,8);
+            TIFFSetField(image, TIFFTAG_BITSPERSAMPLE,bitsPerSample);
             TIFFSetField(image, TIFFTAG_SAMPLESPERPIXEL,samplesPerPixel);
             TIFFSetField(image, TIFFTAG_PHOTOMETRIC, photometric);
             TIFFSetField(image, TIFFTAG_COMPRESSION, COMPRESSION_PACKBITS);