separate out put_signed_pixels_clamped() into its own function and

implement an optimized MMX version of the function

Originally committed as revision 3082 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 22 insertions, 0 deletions

diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
index 7b554b1fd0..b1252251ad 100644
--- a/libavcodec/dsputil.c
+++ b/libavcodec/dsputil.c
@@ -332,6 +332,27 @@ static void put_pixels_clamped_c(const DCTELEM *block, uint8_t *restrict pixels,
     }
 }
 
+static void put_signed_pixels_clamped_c(const DCTELEM *block, 
+                                        uint8_t *restrict pixels,
+                                        int line_size)
+{
+    int i, j;
+
+    for (i = 0; i < 8; i++) {
+        for (j = 0; j < 8; j++) {
+            if (*block < -128)
+                *pixels = 0;
+            else if (*block > 127)
+                *pixels = 255;
+            else
+                *pixels = (uint8_t)(*block + 128);
+            block++;
+            pixels++;
+        }
+        pixels += (line_size - 8);
+    }
+}
+
 static void add_pixels_clamped_c(const DCTELEM *block, uint8_t *restrict pixels,
                           int line_size)
 {
@@ -3131,6 +3152,7 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
     c->get_pixels = get_pixels_c;
     c->diff_pixels = diff_pixels_c;
     c->put_pixels_clamped = put_pixels_clamped_c;
+    c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
     c->add_pixels_clamped = add_pixels_clamped_c;
     c->gmc1 = gmc1_c;
     c->gmc = gmc_c;