Changeset 78ff3248b466be5befb709ad42c824dbb37137a6

Timestamp:

04/19/07 19:43:16 (1 year ago)

Author:

Antoine Cellerier <dionoea@videolan.org>

git-committer:

Antoine Cellerier <dionoea@videolan.org> 1177004596 +0000

git-parent:

[b40e111415d8d5d33122e63b1f802393875c1719]

git-author:

Antoine Cellerier <dionoea@videolan.org> 1177004596 +0000

Message:

Optimze nearest neighboor scaling implementation. This is used by the sub pictures core. CPU decrease compared to previous version with my test filter was: 66% for YUVA, 65% for I420 and 71% for RGBA.

Files:

• modules/video_filter/scale.c (modified) (4 diffs)

modules/video_filter/scale.c

@@ -1 +1 @@
-/*****************************************************************************
-
+, I420 and RGBA
- *  Uses the low quality "nearest neighbour" algorithm.
- *****************************************************************************
-
+-2007
- * $Id$
- *
-
+
+
- *
- * This program is free software; you can redistribute it and/or modify
@@ -110 +111 @@
-{
-    picture_t *p_pic_dst;
-, i, j, k, l
+
-
-    if( !p_pic ) return NULL;
@@ -128 +129 @@
-        for( i_plane = 0; i_plane < p_pic_dst->i_planes; i_plane++ )
-        {
+            const int i_src_pitch    = p_pic->p[i_plane].i_pitch;
+            const int i_dst_pitch    = p_pic_dst->p[i_plane].i_pitch;
+            const int i_src_height   = p_filter->fmt_in.video.i_height;
+            const int i_src_width    = p_filter->fmt_in.video.i_width;
+            const int i_dst_height   = p_filter->fmt_out.video.i_height;
+            const int i_dst_width    = p_filter->fmt_out.video.i_width;
+            const int i_dst_visible_lines =
+                                       p_pic_dst->p[i_plane].i_visible_lines;
+            const int i_dst_visible_pitch =
+                                       p_pic_dst->p[i_plane].i_visible_pitch;
+            const int i_dst_hidden_pitch  = i_dst_pitch - i_dst_visible_pitch;
+#define SHIFT_SIZE 16
+            const int i_height_coef  = ( i_src_height << SHIFT_SIZE )
+                                       / i_dst_height;
+            const int i_width_coef   = ( i_src_width << SHIFT_SIZE )
+                                       / i_dst_width;
+            const int i_src_height_1 = i_src_height - 1;
+            const int i_src_width_1  = i_src_width - 1;
+
-            uint8_t *p_src = p_pic->p[i_plane].p_pixels;
-            uint8_t *p_dst = p_pic_dst->p[i_plane].p_pixels;
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-            {
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-                {
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-                }
-            }
@@ -156 +171 @@
-    else /* RGBA */
-    {
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-        {
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-            {
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-            }
-        }