Add atop operator

1 files changed, 20 insertions, 11 deletions

diff --git a/test/ds.c b/test/ds.c
index ef315f7..936d130 100644
--- a/test/ds.c
+++ b/test/ds.c
@@ -18,6 +18,8 @@
 #define COMPOSITE_ADD(d,s) ORC_CLAMP((d) + (s), 0, 255)
 #define COMPOSITE_IN(s,m) ORC_MULDIV_255((s),(m))
 #define COMPOSITE_OUT(s,m) (ORC_MULDIV_255((s),(255-m)))
+#define COMPOSITE_ATOP(s,da,d,sa) \
+  (ORC_DIVIDE_255((s)*(da))+ORC_DIVIDE_255((d)*(255-(sa))))
 
 #define ORC_DIVIDE_255(x) ((((x)+128) + (((x)+128)>>8))>>8)
 #define ORC_MULDIV_255(a,b) ORC_DIVIDE_255((a)*(b))
@@ -56,7 +58,7 @@ combine_mask (const uint32_t *src, const uint32_t *mask, int i)
 }
 
 void
-combine_out_u (pixman_implementation_t *imp,
+combine_atop_u (pixman_implementation_t *imp,
                 pixman_op_t              op,
                 uint32_t *                dest,
                 const uint32_t *          src,
@@ -68,8 +70,11 @@ combine_out_u (pixman_implementation_t *imp,
     for (i = 0; i < width; ++i)
     {
         uint32_t s = combine_mask (src, mask, i);
-        uint32_t a = ALPHA_8 (~*(dest + i));
-        UN8x4_MUL_UN8 (s, a);
+        uint32_t d = *(dest + i);
+        uint32_t dest_a = ALPHA_8 (d);
+        uint32_t src_ia = ALPHA_8 (~s);
+
+        UN8x4_MUL_UN8_ADD_UN8x4_MUL_UN8 (s, dest_a, d, src_ia);
         *(dest + i) = s;
     }
 }
@@ -119,18 +124,22 @@ int main (int argc, char *argv[])
     mask[i]=ORC_ARGB(255,0,0,0);
   }
 
-  //combine_out_u (NULL, 0, dest, src, mask, 256);
-  combine_out_u (NULL, 0, dest_ref, src, NULL, 256);
-  orc_code_combine_out_u_n (dest, src, 256);
+  //combine_atop_u (NULL, 0, dest, src, mask, 256);
+  combine_atop_u (NULL, 0, dest_ref, src, NULL, 256);
+  orc_code_combine_atop_u_n (dest, src, 256);
 
 #if 0
   for(i=0;i<256;i++){
-    int a = ORC_ARGB_A(dest[i]);
+    //int a = ORC_ARGB_A(dest[i]);
     dest[i] = ORC_ARGB(
-        COMPOSITE_OUT(ORC_ARGB_A(src[i]), a),
-        COMPOSITE_OUT(ORC_ARGB_R(src[i]), a),
-        COMPOSITE_OUT(ORC_ARGB_G(src[i]), a),
-        COMPOSITE_OUT(ORC_ARGB_B(src[i]), a));
+        COMPOSITE_ATOP(ORC_ARGB_A(src[i]), ORC_ARGB_A(dest[i]),
+          ORC_ARGB_A(dest[i]), ORC_ARGB_A(src[i])),
+        COMPOSITE_ATOP(ORC_ARGB_R(src[i]), ORC_ARGB_A(dest[i]),
+          ORC_ARGB_R(dest[i]), ORC_ARGB_A(src[i])),
+        COMPOSITE_ATOP(ORC_ARGB_G(src[i]), ORC_ARGB_A(dest[i]),
+          ORC_ARGB_G(dest[i]), ORC_ARGB_A(src[i])),
+        COMPOSITE_ATOP(ORC_ARGB_B(src[i]), ORC_ARGB_A(dest[i]),
+          ORC_ARGB_B(dest[i]), ORC_ARGB_A(src[i])));
 
   }
 #endif