Add a fast path for the add_n_8888_8888() operation.

It shows up on gnome-terminal traces.

diff --git a/pixman/pixman-fast-path.c b/pixman/pixman-fast-path.c
index d2ce26f..40b7f9c 100644 (file)
--- a/pixman/pixman-fast-path.c
+++ b/pixman/pixman-fast-path.c
@@ -348,6 +348,67 @@ fast_composite_over_n_8_8888 (pixman_implementation_t *imp,
 }
 
 static void
+fast_composite_add_n_8888_8888_ca (pixman_implementation_t *imp,
+                                  pixman_op_t              op,
+                                  pixman_image_t *         src_image,
+                                  pixman_image_t *         mask_image,
+                                  pixman_image_t *         dst_image,
+                                  int32_t                  src_x,
+                                  int32_t                  src_y,
+                                  int32_t                  mask_x,
+                                  int32_t                  mask_y,
+                                  int32_t                  dest_x,
+                                  int32_t                  dest_y,
+                                  int32_t                  width,
+                                  int32_t                  height)
+{
+    uint32_t src, srca, s;
+    uint32_t    *dst_line, *dst, d;
+    uint32_t    *mask_line, *mask, ma;
+    int dst_stride, mask_stride;
+    uint16_t w;
+
+    src = _pixman_image_get_solid (src_image, dst_image->bits.format);
+
+    srca = src >> 24;
+    if (src == 0)
+       return;
+
+    PIXMAN_IMAGE_GET_LINE (dst_image, dest_x, dest_y, uint32_t, dst_stride, dst_line, 1);
+    PIXMAN_IMAGE_GET_LINE (mask_image, mask_x, mask_y, uint32_t, mask_stride, mask_line, 1);
+
+    while (height--)
+    {
+       dst = dst_line;
+       dst_line += dst_stride;
+       mask = mask_line;
+       mask_line += mask_stride;
+       w = width;
+
+       while (w--)
+       {
+           ma = *mask++;
+
+           if (ma == 0xffffffff && srca == 0xff)
+           {
+               *dst = src;
+           }
+           else if (ma)
+           {
+               d = *dst;
+               s = src;
+               
+               UN8x4_MUL_UN8x4_ADD_UN8x4 (s, ma, d);
+
+               *dst = s;
+           }
+
+           dst++;
+       }
+    }
+}
+
+static void
 fast_composite_over_n_8888_8888_ca (pixman_implementation_t *imp,
                                     pixman_op_t              op,
                                     pixman_image_t *         src_image,
@@ -1064,6 +1125,7 @@ static const pixman_fast_path_t c_fast_paths[] =
     { PIXMAN_OP_ADD, PIXMAN_a8r8g8b8,  PIXMAN_null,     PIXMAN_a8r8g8b8, fast_composite_add_8888_8888,   0 },
     { PIXMAN_OP_ADD, PIXMAN_a8b8g8r8,  PIXMAN_null,     PIXMAN_a8b8g8r8, fast_composite_add_8888_8888,   0 },
     { PIXMAN_OP_ADD, PIXMAN_a8,        PIXMAN_null,     PIXMAN_a8,       fast_composite_add_8000_8000,   0 },
+    { PIXMAN_OP_ADD, PIXMAN_solid,     PIXMAN_a8r8g8b8, PIXMAN_a8r8g8b8, fast_composite_add_n_8888_8888_ca, NEED_COMPONENT_ALPHA },
     { PIXMAN_OP_ADD, PIXMAN_solid,     PIXMAN_a8,       PIXMAN_a8,       fast_composite_add_8888_8_8,    0 },
     { PIXMAN_OP_SRC, PIXMAN_solid,     PIXMAN_null,     PIXMAN_a8r8g8b8, fast_composite_solid_fill, 0 },
     { PIXMAN_OP_SRC, PIXMAN_solid,     PIXMAN_null,     PIXMAN_x8r8g8b8, fast_composite_solid_fill, 0 },