3eca58ed59
This software package contains an implementation of JPEG-LS, the emerging lossless/near-lossless compression standard for continuous-tone images being developed by ISO/IEC JTC1/SC29/WG1 (draft document FCD14495 as of November 1997). The names of the executables in the software package derive from the acronym LOCO, as the core of the new standard is based on the LOCO-I algorithm (LOw COmplexity LOssless COmpression for Images) developed at Hewlett-Packard Laboratories (reference: M. Weinberger, G. Seroussi, G. Sapiro, "LOCO-I: A Low Complexity, Context-Based, Lossless Image Compression Algorithm," Proc. IEEE Data Compression Conference, Snowbird, Utah, March-April 1996). The term "near-lossless compression" refers to a lossy algorithm for which each decompressed image sample differs from the corresponding original image sample by not more than a pre-specified value, the (usually small) "loss." Lossless compression corresponds to loss=0. Even though the term "continuous-tone image" refers in principle to any image whose components have more than one bit per sample, palletized images may require a reordering of the color palette for best compression results using LOCO-I on the array of color indices. This functionality is not implemented in the present software, although it is supported by the new standard, and is easy enough to implement with the tools given. Notice, however, that LOCO-I and JPEG-LS were not designed, and might not give optimal performance, for images that have been palletized through dithering.
31 lines
895 B
Text
31 lines
895 B
Text
$NetBSD: patch-aa,v 1.1.1.1 2003/12/21 21:29:08 wiz Exp $
|
|
|
|
--- Decoder/global.h.orig Tue Jun 22 21:04:33 1999
|
|
+++ Decoder/global.h
|
|
@@ -95,8 +95,6 @@ extern char *plane_int_string,
|
|
*pixel_int_string;
|
|
|
|
|
|
-#define BIG_ENDIAN 1
|
|
-
|
|
typedef struct jpeg_ls {
|
|
|
|
int columns, /* The number of columns */
|
|
@@ -318,7 +316,7 @@ extern int alpha;
|
|
extern int vLUT[3][2 * LUTMAX16];
|
|
extern int lutmax;
|
|
extern int classmap[CONTEXTS1];
|
|
-extern int *qdiv0, *qdiv, /* quantization table (division via look-up) */
|
|
+extern int *qdiv0, *qdiv1, /* quantization table (division via look-up) */
|
|
*qmul0, *qmul; /* dequantization table */
|
|
|
|
/* statistics tables */
|
|
@@ -359,7 +357,7 @@ void prepareLUTs();
|
|
void prepare_qtables(int, int);
|
|
void init_stats(int);
|
|
|
|
-#ifdef BIG_ENDIAN
|
|
+#ifdef NEVER_ASSUME_BIG_ENDIAN
|
|
# define ENDIAN8(x) (x)
|
|
# define ENDIAN16(x) (x)
|
|
#else
|