Fix the pixman renderer with respect to output transforms

Commit fa1b3055 introducted a regression in the pixman renderer.  In
particular, it would not draw properly with any output transform other
than normal, 180, 180-flipped, or 270-flipped.  This patch fixes this
regression.  The weston-scalar program appears to work normally at all
rotations with this patch.  Therefore, this patch should fix the regression
while maintaining the added functionality from fa1b3055.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>

src/pixman-renderer.c

@@ -276,12 +276,8 @@ repaint_region(struct weston_view *ev, struct weston_output *output,
 							     pixman_double_to_fixed(viewport_y));
 	}
 
-	pixman_transform_scale(&transform, NULL,
-			       pixman_double_to_fixed(ev->surface->buffer_viewport.scale),
-			       pixman_double_to_fixed(ev->surface->buffer_viewport.scale));
-
-	fw = pixman_int_to_fixed(pixman_image_get_width(ps->image));
-	fh = pixman_int_to_fixed(pixman_image_get_height(ps->image));
+	fw = pixman_int_to_fixed(ev->surface->width);
+	fh = pixman_int_to_fixed(ev->surface->height);
 
 	switch (ev->surface->buffer_viewport.transform) {
 	case WL_OUTPUT_TRANSFORM_FLIPPED:
@@ -317,6 +313,10 @@ repaint_region(struct weston_view *ev, struct weston_output *output,
 		break;
 	}
 
+	pixman_transform_scale(&transform, NULL,
+			       pixman_double_to_fixed(ev->surface->buffer_viewport.scale),
+			       pixman_double_to_fixed(ev->surface->buffer_viewport.scale));
+
 	pixman_image_set_transform(ps->image, &transform);
 
 	if (ev->transform.enabled || output->current_scale != ev->surface->buffer_viewport.scale)