ENH: Fix compilation on Win32

[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..13fcdb04078a345e5f075e4586d81d16a7de178c 100644 (file)
--- a/src/jpeg/libijg/README.GDCM.txt
+++ b/src/jpeg/libijg/README.GDCM.txt
@@ -9,7 +9,69 @@ We'd like to thank the IJG for distributing a public JPEG IO library.
 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.
 
+
+
+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
+