ENH: ok making too many mistakes time to go to bed

[gdcm.git] / src / jpeg / libijg / README.GDCM.txt

diff --git a/src/jpeg/libijg/README.GDCM.txt b/src/jpeg/libijg/README.GDCM.txt
index 836b344b5465391e8653029a90eb5f89de2562d4..b1c4423857bc9c86099952166d8541e4e265eb78 100644 (file)
--- a/src/jpeg/libijg/README.GDCM.txt
+++ b/src/jpeg/libijg/README.GDCM.txt
@@ -9,7 +9,75 @@ We'd like to thank the IJG for distributing a public JPEG IO library.
 Modifications
 -------------
 
 Modifications
 -------------
 

+1.

 jconfig.h is usually generated by the build process. For this distribution,
 we ship a version of jconfig.h.in to be used across several platforms. It's 
 purpose is also to allow generation of both 8bits and 12bits lib.
 
 jconfig.h is usually generated by the build process. For this distribution,
 we ship a version of jconfig.h.in to be used across several platforms. It's 
 purpose is also to allow generation of both 8bits and 12bits lib.
 

+
+
+2.
+jdhuff.c was modified to support special Philips MRI image:
+
+Index: jdhuff.c
+===================================================================
+RCS file: /cvs/public/gdcm/src/jpeg/libijg8/jdhuff.c,v
+retrieving revision 1.1
+diff -u -3 -p -r1.1 jdhuff.c
+--- jdhuff.c    24 Jun 2003 10:09:48 -0000      1.1
++++ jdhuff.c    7 Oct 2004 02:29:43 -0000
+@@ -259,8 +259,11 @@ jpeg_make_d_derived_tbl (j_decompress_pt
+   if (isDC) {
+     for (i = 0; i < numsymbols; i++) {
+       int sym = htbl->huffval[i];
+-      if (sym < 0 || sym > 15)
+-       ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
++      if (sym < 0 || sym > 15) {
++         // Now, we can read Philips MRI Images
++         htbl->huffval[i]=15;
++//     ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
++      }
+     }
+   }
+ }
+
+
+3.
+jmorecfg.h was modified so that we can modify it automatically at build time to
+either generate a 8bits jpeg lib or 12bits jpeg library:
+
+Index: jmorecfg.h
+===================================================================
+RCS file: /cvs/public/gdcm/src/jpeg/libijg8/jmorecfg.h,v
+retrieving revision 1.4
+diff -u -3 -p -r1.4 jmorecfg.h
+--- jmorecfg.h  31 Oct 2003 14:59:50 -0000      1.4
++++ jmorecfg.h  7 Oct 2004 02:30:40 -0000
+@@ -19,7 +19,8 @@
+  * We do not support run-time selection of data precision, sorry.
+  */
+
+-#define BITS_IN_JSAMPLE  8     /* use 8 or 12 */
++//#define BITS_IN_JSAMPLE  8   /* use 8 or 12 */
++#define BITS_IN_JSAMPLE @GDCM_BITS_IN_JSAMPLE@
+
+ /*
+  * Maximum number of components (color channels) allowed in JPEG image.
+
+
+
+
+4.
+To further allow us to have to different copy of the 8bits and 12bits jpeg
+library we had to mangle the name. Fur this purpose two new file were added to
+the library: gdcm_mangle_8bits.h and gdcm_mangle_12bits.h. Those file were
+generated using:
+
+        nm libgdcmijpeg8.a | grep " T " | colrm 1 11 | sort
+
+
+5.
+In order to read lossless images, we had to apply the ls-patch to jpeg-6b ... to be continued
+
+
+(shoud we disalbe getenv just as dcmtk ?