From 8fbd4f51a8bf8ae56303d1c7a18bf357b606df61 Mon Sep 17 00:00:00 2001
From: Måns Rullgård <mans@mansr.com>
Date: Tue, 22 Jun 2010 23:12:48 +0000
Subject: Improve some uses of ff_cropTbl with constant offset

Originally committed as revision 23728 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/vc1dsp.c | 60 ++++++++++++++++++++++++++++-------------------------
 1 file changed, 32 insertions(+), 28 deletions(-)

(limited to 'libavcodec/vc1dsp.c')

diff --git a/libavcodec/vc1dsp.c b/libavcodec/vc1dsp.c
index 47b69c8214..8634bef69b 100644
--- a/libavcodec/vc1dsp.c
+++ b/libavcodec/vc1dsp.c
@@ -182,18 +182,19 @@ static void vc1_inv_trans_8x8_dc_c(uint8_t *dest, int linesize, DCTELEM *block)
 {
     int i;
     int dc = block[0];
-    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
+    const uint8_t *cm;
     dc = (3 * dc +  1) >> 1;
     dc = (3 * dc + 16) >> 5;
+    cm = ff_cropTbl + MAX_NEG_CROP + dc;
     for(i = 0; i < 8; i++){
-        dest[0] = cm[dest[0]+dc];
-        dest[1] = cm[dest[1]+dc];
-        dest[2] = cm[dest[2]+dc];
-        dest[3] = cm[dest[3]+dc];
-        dest[4] = cm[dest[4]+dc];
-        dest[5] = cm[dest[5]+dc];
-        dest[6] = cm[dest[6]+dc];
-        dest[7] = cm[dest[7]+dc];
+        dest[0] = cm[dest[0]];
+        dest[1] = cm[dest[1]];
+        dest[2] = cm[dest[2]];
+        dest[3] = cm[dest[3]];
+        dest[4] = cm[dest[4]];
+        dest[5] = cm[dest[5]];
+        dest[6] = cm[dest[6]];
+        dest[7] = cm[dest[7]];
         dest += linesize;
     }
 }
@@ -273,18 +274,19 @@ static void vc1_inv_trans_8x4_dc_c(uint8_t *dest, int linesize, DCTELEM *block)
 {
     int i;
     int dc = block[0];
-    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
+    const uint8_t *cm;
     dc = ( 3 * dc +  1) >> 1;
     dc = (17 * dc + 64) >> 7;
+    cm = ff_cropTbl + MAX_NEG_CROP + dc;
     for(i = 0; i < 4; i++){
-        dest[0] = cm[dest[0]+dc];
-        dest[1] = cm[dest[1]+dc];
-        dest[2] = cm[dest[2]+dc];
-        dest[3] = cm[dest[3]+dc];
-        dest[4] = cm[dest[4]+dc];
-        dest[5] = cm[dest[5]+dc];
-        dest[6] = cm[dest[6]+dc];
-        dest[7] = cm[dest[7]+dc];
+        dest[0] = cm[dest[0]];
+        dest[1] = cm[dest[1]];
+        dest[2] = cm[dest[2]];
+        dest[3] = cm[dest[3]];
+        dest[4] = cm[dest[4]];
+        dest[5] = cm[dest[5]];
+        dest[6] = cm[dest[6]];
+        dest[7] = cm[dest[7]];
         dest += linesize;
     }
 }
@@ -350,14 +352,15 @@ static void vc1_inv_trans_4x8_dc_c(uint8_t *dest, int linesize, DCTELEM *block)
 {
     int i;
     int dc = block[0];
-    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
+    const uint8_t *cm;
     dc = (17 * dc +  4) >> 3;
     dc = (12 * dc + 64) >> 7;
+    cm = ff_cropTbl + MAX_NEG_CROP + dc;
     for(i = 0; i < 8; i++){
-        dest[0] = cm[dest[0]+dc];
-        dest[1] = cm[dest[1]+dc];
-        dest[2] = cm[dest[2]+dc];
-        dest[3] = cm[dest[3]+dc];
+        dest[0] = cm[dest[0]];
+        dest[1] = cm[dest[1]];
+        dest[2] = cm[dest[2]];
+        dest[3] = cm[dest[3]];
         dest += linesize;
     }
 }
@@ -423,14 +426,15 @@ static void vc1_inv_trans_4x4_dc_c(uint8_t *dest, int linesize, DCTELEM *block)
 {
     int i;
     int dc = block[0];
-    const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
+    const uint8_t *cm;
     dc = (17 * dc +  4) >> 3;
     dc = (17 * dc + 64) >> 7;
+    cm = ff_cropTbl + MAX_NEG_CROP + dc;
     for(i = 0; i < 4; i++){
-        dest[0] = cm[dest[0]+dc];
-        dest[1] = cm[dest[1]+dc];
-        dest[2] = cm[dest[2]+dc];
-        dest[3] = cm[dest[3]+dc];
+        dest[0] = cm[dest[0]];
+        dest[1] = cm[dest[1]];
+        dest[2] = cm[dest[2]];
+        dest[3] = cm[dest[3]];
         dest += linesize;
     }
 }
-- 
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