Fix scaling with a device offset

From: Jeff Muizelaar <jmuizelaar@mozilla.com>

Apply the device offset transformation to the pattern before the ctm one.
Fixes bug #16469.
---

 src/cairo-gstate.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/cairo-gstate.c b/src/cairo-gstate.c
index 0eb6e7d..4ba2873 100644
--- a/src/cairo-gstate.c
+++ b/src/cairo-gstate.c
@@ -795,8 +795,8 @@ _cairo_gstate_copy_transformed_pattern (cairo_gstate_t  *gstate,
     if (status)
 	return status;
 
-    _cairo_pattern_transform (pattern, ctm_inverse);
-
+    /* the device transform is applied first so that it is transformed by
+     * ctm_inverse */
     if (cairo_pattern_get_type (original) == CAIRO_PATTERN_TYPE_SURFACE) {
         surface_pattern = (cairo_surface_pattern_t *) original;
         surface = surface_pattern->surface;
@@ -804,6 +804,8 @@ _cairo_gstate_copy_transformed_pattern (cairo_gstate_t  *gstate,
             _cairo_pattern_transform (pattern, &surface->device_transform);
     }
 
+    _cairo_pattern_transform (pattern, ctm_inverse);
+
     return CAIRO_STATUS_SUCCESS;
 }