New flags for 90/180/270 rotation

These flags are set when the transform is a simple nonscaled 90/180/270
degrees rotation.

diff --git a/pixman/pixman-image.c b/pixman/pixman-image.c
index a72299b..e91d87c 100644 (file)
--- a/pixman/pixman-image.c
+++ b/pixman/pixman-image.c
@@ -211,8 +211,25 @@ compute_image_info (pixman_image_t *image)
            if (image->common.transform->matrix[0][1] == 0 &&
                image->common.transform->matrix[1][0] == 0)
            {
+               if (image->common.transform->matrix[0][0] == -pixman_fixed_1 &&
+                   image->common.transform->matrix[1][1] == -pixman_fixed_1)
+               {
+                   flags |= FAST_PATH_ROTATE_180_TRANSFORM;
+               }
                flags |= FAST_PATH_SCALE_TRANSFORM;
            }
+           else if (image->common.transform->matrix[0][0] == 0 &&
+                    image->common.transform->matrix[1][1] == 0)
+           {
+               pixman_fixed_t m01 = image->common.transform->matrix[0][1];
+               if (m01 == -image->common.transform->matrix[1][0])
+               {
+                       if (m01 == -pixman_fixed_1)
+                           flags |= FAST_PATH_ROTATE_90_TRANSFORM;
+                       else if (m01 == pixman_fixed_1)
+                           flags |= FAST_PATH_ROTATE_270_TRANSFORM;
+               }
+           }
        }
 
        if (image->common.transform->matrix[0][0] > 0)

diff --git a/pixman/pixman-private.h b/pixman/pixman-private.h
index f5d0ba1..1473dc4 100644 (file)
--- a/pixman/pixman-private.h
+++ b/pixman/pixman-private.h
@@ -611,6 +611,9 @@ _pixman_iter_get_scanline_noop (pixman_iter_t *iter, const uint32_t *mask);
 #define FAST_PATH_AFFINE_TRANSFORM             (1 << 18)
 #define FAST_PATH_Y_UNIT_ZERO                  (1 << 19)
 #define FAST_PATH_BILINEAR_FILTER              (1 << 20)
+#define FAST_PATH_ROTATE_90_TRANSFORM          (1 << 21)
+#define FAST_PATH_ROTATE_180_TRANSFORM         (1 << 22)
+#define FAST_PATH_ROTATE_270_TRANSFORM         (1 << 23)
 
 #define FAST_PATH_PAD_REPEAT                                           \
     (FAST_PATH_NO_NONE_REPEAT          |                               \