[test] Add rotated clip.

Exercise a bug found in not offsetting the clip mask when combining with
the composite mask.

test/Makefile.am

@@ -785,6 +785,9 @@ REFERENCE_IMAGES = \
 	rotate-image-surface-paint.quartz.ref.png \
 	rotate-image-surface-paint.ref.png \
 	rotate-image-surface-paint.svg.ref.png \
+	rotated-clip.ref.png \
+	rotated-clip.ps.ref.png \
+	rotated-clip.xlib.ref.png \
 	scale-down-source-surface-paint.ref.png \
 	scale-offset-image.gl.ref.png \
 	scale-offset-image.pdf.ref.png \

test/Makefile.sources

@@ -165,6 +165,7 @@ test_sources = \
 	rel-path.c					\
 	rgb24-ignore-alpha.c				\
 	rotate-image-surface-paint.c			\
+	rotated-clip.c					\
 	scale-down-source-surface-paint.c		\
 	scale-offset-image.c				\
 	scale-offset-similar.c				\

test/rotated-clip.c

@@ -0,0 +1,110 @@
+/*
+ * Copyright © 2007 Adrian Johnson
+ * Copyright © 2009 Chris Wilson
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Author: Adrian Johnson <ajohnson@redneon.com>
+ *         Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+#define PAT_WIDTH  120
+#define PAT_HEIGHT 120
+#define SIZE (PAT_WIDTH*2)
+#define PAD 2
+#define WIDTH (PAD + SIZE + PAD)
+#define HEIGHT WIDTH
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_matrix_t m;
+
+    /* make the output opaque */
+    cairo_set_source_rgb (cr, 0, 0, 0);
+    cairo_paint (cr);
+
+    cairo_translate (cr, PAD, PAD);
+
+    cairo_matrix_init_scale (&m, 2, 1.5);
+    cairo_matrix_rotate (&m, 1);
+    cairo_matrix_translate (&m, -PAT_WIDTH/4.0, -PAT_WIDTH/2.0);
+    cairo_matrix_invert (&m);
+    cairo_set_matrix (cr, &m);
+
+    cairo_rectangle (cr, 0, 0, PAT_WIDTH, PAT_HEIGHT);
+    cairo_clip (cr);
+
+    cairo_set_source_rgba (cr, 1, 0, 1, 0.5);
+    cairo_rectangle (cr, PAT_WIDTH/6.0, PAT_HEIGHT/6.0, PAT_WIDTH/4.0, PAT_HEIGHT/4.0);
+    cairo_fill (cr);
+
+    cairo_set_source_rgba (cr, 0, 1, 1, 0.5);
+    cairo_rectangle (cr, PAT_WIDTH/2.0, PAT_HEIGHT/2.0, PAT_WIDTH/4.0, PAT_HEIGHT/4.0);
+    cairo_fill (cr);
+
+    cairo_set_line_width (cr, 1);
+    cairo_move_to (cr, PAT_WIDTH/6.0, 0);
+    cairo_line_to (cr, 0, 0);
+    cairo_line_to (cr, 0, PAT_HEIGHT/6.0);
+    cairo_set_source_rgb (cr, 1, 0, 0);
+    cairo_stroke (cr);
+
+    cairo_move_to (cr, PAT_WIDTH/6.0, PAT_HEIGHT);
+    cairo_line_to (cr, 0, PAT_HEIGHT);
+    cairo_line_to (cr, 0, 5*PAT_HEIGHT/6.0);
+    cairo_set_source_rgb (cr, 0, 1, 0);
+    cairo_stroke (cr);
+
+    cairo_move_to (cr, 5*PAT_WIDTH/6.0, 0);
+    cairo_line_to (cr, PAT_WIDTH, 0);
+    cairo_line_to (cr, PAT_WIDTH, PAT_HEIGHT/6.0);
+    cairo_set_source_rgb (cr, 0, 0, 1);
+    cairo_stroke (cr);
+
+    cairo_move_to (cr, 5*PAT_WIDTH/6.0, PAT_HEIGHT);
+    cairo_line_to (cr, PAT_WIDTH, PAT_HEIGHT);
+    cairo_line_to (cr, PAT_WIDTH, 5*PAT_HEIGHT/6.0);
+    cairo_set_source_rgb (cr, 1, 1, 0);
+    cairo_stroke (cr);
+
+    cairo_set_source_rgb (cr, 0.5, 0.5, 0.5);
+    cairo_set_line_width (cr, PAT_WIDTH/10.0);
+
+    cairo_move_to (cr, 0,         PAT_HEIGHT/4.0);
+    cairo_line_to (cr, PAT_WIDTH, PAT_HEIGHT/4.0);
+    cairo_stroke (cr);
+
+    cairo_move_to (cr, PAT_WIDTH/4.0,         0);
+    cairo_line_to (cr, PAT_WIDTH/4.0, PAT_WIDTH);
+    cairo_stroke (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (rotated_clip,
+	    "Test clipping with non identity pattern matrix",
+	    "clip", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, HEIGHT,
+	    NULL, draw)