From b25514a43f8780a13de5f09cb45c6046a60f4447 Mon Sep 17 00:00:00 2001
From: Xiaohui Sun <sunxiaohui@dsp.ac.cn>
Date: Tue, 3 Apr 2007 06:40:21 +0000
Subject: [PATCH] Changed the rle encoder a little and made it more universal.
 Not only the repeated byte is calculated as (count ^ xor) + add but also the
 raw encoding lenth byte is calculated as that too patch by Xiaohui Sun
 sunxiaohui  dsp ac cn

Originally committed as revision 8602 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/rle.c      | 7 ++++---
 libavcodec/rle.h      | 6 ++++--
 libavcodec/targaenc.c | 2 +-
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/libavcodec/rle.c b/libavcodec/rle.c
index acbd1f4..4f94e7d 100644
--- a/libavcodec/rle.c
+++ b/libavcodec/rle.c
@@ -55,7 +55,8 @@ static int count_pixels(const uint8_t *start, int len, int bpp, int same)
     return count;
 }
 
-int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr , int bpp, int w, int8_t add, uint8_t xor)
+int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr , int bpp, int w,
+                   int8_t add_rep, uint8_t xor_rep,int8_t add_raw,uint8_t xor_raw)
 {
     int count, x;
     uint8_t *out = outbuf;
@@ -64,13 +65,13 @@ int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *ptr , int bpp, i
         /* see if we can encode the next set of pixels with RLE */
         if((count = count_pixels(ptr, w-x, bpp, 1)) > 1) {
             if(out + bpp + 1 > outbuf + out_size) return -1;
-            *out++ = (count ^ xor) + add;
+            *out++ = (count ^ xor_rep) + add_rep;
             memcpy(out, ptr, bpp);
             out += bpp;
         } else {
             /* fall back on uncompressed */
             count = count_pixels(ptr, w-x, bpp, 0);
-            *out++ = count - 1;
+            *out++ = (count ^ xor_raw) + add_raw;
 
             if(out + bpp*count > outbuf + out_size) return -1;
             memcpy(out, ptr, bpp * count);
diff --git a/libavcodec/rle.h b/libavcodec/rle.h
index 5da09f2..8ec3996 100644
--- a/libavcodec/rle.h
+++ b/libavcodec/rle.h
@@ -23,7 +23,8 @@
 #define RLE_H
 
 /**
- * RLE compress the row, with maximum size of out_size. Value before repeated bytes is (count ^ xor) + add.
+ * RLE compress the row, with maximum size of out_size. Value before repeated bytes is (count ^ xor_rep) + add_rep.
+ *                                                      Value before raw bytes is      (count ^ xor_raw) + add_raw.
  * @param outbuf Output buffer
  * @param out_size Maximum output size
  * @param ptr Input buffer
@@ -31,6 +32,7 @@
  * @param w Image width
  * @return Size of output in bytes, or -1 if larger than out_size
  */
-int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *inbuf, int bpp, int w, int8_t add, uint8_t xor);
+int ff_rle_encode(uint8_t *outbuf, int out_size, const uint8_t *inbuf, int bpp, int w,
+                 int8_t add_rep, uint8_t xor_rep, int8_t add_raw, uint8_t xor_raw);
 
 #endif /* RLE_H */
diff --git a/libavcodec/targaenc.c b/libavcodec/targaenc.c
index 72d27dc..8852d0d 100644
--- a/libavcodec/targaenc.c
+++ b/libavcodec/targaenc.c
@@ -41,7 +41,7 @@ static int targa_encode_rle(uint8_t *outbuf, int out_size, AVFrame *pic,
     out = outbuf;
 
     for(y = 0; y < h; y ++) {
-        ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0);
+        ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
         if(ret == -1){
             return -1;
         }
-- 
2.7.4