[test] Exercise push-group-color.

Hunting for a known bug in the xlib backend where it invalidly converts
an argb32 source to rgb24. However, this does not appear to be that bug,
but still a useful exercise nevertheless.

test/Makefile.am

@@ -759,6 +759,8 @@ REFERENCE_IMAGES = \
 	push-group.rgb24.ref.png \
 	push-group.xlib.ref.png \
 	push-group.xlib.rgb24.ref.png \
+	push-group-color.ref.png \
+	push-group-color.xlib.ref.png \
 	quartz-surface-source.ps2.ref.png \
 	quartz-surface-source.ps3.ref.png \
 	quartz-surface-source.ref.png \

test/Makefile.sources

@@ -156,6 +156,7 @@ test_sources = \
 	pixman-rotate.c					\
 	png.c						\
 	push-group.c					\
+	push-group-color.c				\
 	radial-gradient.c				\
 	random-intersections-eo.c			\
 	random-intersections-nonzero.c			\

test/push-group-color.c

@@ -0,0 +1,141 @@
+/*
+ * Copyright © 2005 Mozilla Corporation
+ * Copyright © 2009 Intel Corporation
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of
+ * Mozilla Corporation not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Mozilla Corporation makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * MOZILLA CORPORATION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL MOZILLA CORPORATION BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Vladimir Vukicevic <vladimir@pobox.com>
+ *         Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+#define UNIT_SIZE 100
+#define PAD 5
+#define INNER_PAD 10
+
+#define WIDTH (UNIT_SIZE + PAD) + PAD
+#define HEIGHT (UNIT_SIZE + PAD) + PAD
+
+static cairo_pattern_t *
+argb32_source (void)
+{
+    cairo_surface_t *surface;
+    cairo_pattern_t *pattern;
+    cairo_t *cr;
+
+    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 16, 16);
+    cr = cairo_create (surface);
+    cairo_surface_destroy (surface);
+
+    cairo_set_source_rgb (cr, 1, 0, 0);
+    cairo_rectangle (cr, 8, 0, 8, 8);
+    cairo_fill (cr);
+
+    cairo_set_source_rgb (cr, 0, 1, 0);
+    cairo_rectangle (cr, 0, 8, 8, 8);
+    cairo_fill (cr);
+
+    cairo_set_source_rgb (cr, 0, 0, 1);
+    cairo_rectangle (cr, 8, 8, 8, 8);
+    cairo_fill (cr);
+
+    pattern = cairo_pattern_create_for_surface (cairo_get_target (cr));
+    cairo_destroy (cr);
+
+    return pattern;
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_pattern_t *gradient, *image;
+
+    cairo_set_source_rgb (cr, 1,1,1);
+    cairo_paint (cr);
+
+    cairo_translate (cr, PAD, PAD);
+
+    /* clip to the unit size */
+    cairo_rectangle (cr, 0, 0,
+		     UNIT_SIZE, UNIT_SIZE);
+    cairo_clip (cr);
+
+    cairo_rectangle (cr, 0, 0,
+		     UNIT_SIZE, UNIT_SIZE);
+    cairo_set_source_rgba (cr, 0, 0, 0, 1);
+    cairo_set_line_width (cr, 2);
+    cairo_stroke (cr);
+
+    /* start a group */
+    cairo_push_group_with_content (cr, CAIRO_CONTENT_COLOR);
+
+    /* draw a gradient background */
+    cairo_save (cr);
+    cairo_translate (cr, INNER_PAD, INNER_PAD);
+    cairo_new_path (cr);
+    cairo_rectangle (cr, 0, 0,
+		     UNIT_SIZE - (INNER_PAD*2), UNIT_SIZE - (INNER_PAD*2));
+    gradient = cairo_pattern_create_linear (UNIT_SIZE - (INNER_PAD*2), 0,
+                                            UNIT_SIZE - (INNER_PAD*2), UNIT_SIZE - (INNER_PAD*2));
+    cairo_pattern_add_color_stop_rgba (gradient, 0.0, 0.3, 0.3, 0.3, 1.0);
+    cairo_pattern_add_color_stop_rgba (gradient, 1.0, 1.0, 1.0, 1.0, 1.0);
+    cairo_set_source (cr, gradient);
+    cairo_pattern_destroy (gradient);
+    cairo_fill (cr);
+    cairo_restore (cr);
+
+    /* draw diamond */
+    cairo_move_to (cr, UNIT_SIZE / 2, 0);
+    cairo_line_to (cr, UNIT_SIZE    , UNIT_SIZE / 2);
+    cairo_line_to (cr, UNIT_SIZE / 2, UNIT_SIZE);
+    cairo_line_to (cr, 0            , UNIT_SIZE / 2);
+    cairo_close_path (cr);
+    cairo_set_source_rgba (cr, 0, 0, 1, 1);
+    cairo_fill (cr);
+
+    /* draw circle */
+    cairo_arc (cr,
+	       UNIT_SIZE / 2, UNIT_SIZE / 2,
+	       UNIT_SIZE / 3.5,
+	       0, M_PI * 2);
+    cairo_set_source_rgba (cr, 1, 0, 0, 1);
+    cairo_fill (cr);
+
+    /* and put the image on top */
+    cairo_translate (cr, UNIT_SIZE/2 - 8, UNIT_SIZE/2 - 8);
+    image = argb32_source ();
+    cairo_set_source (cr, image);
+    cairo_pattern_destroy (image);
+    cairo_paint (cr);
+
+    cairo_pop_group_to_source (cr);
+    cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+    cairo_paint (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (push_group_color,
+	    "Verify that cairo_push_group_with_content works.",
+	    "group", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, HEIGHT,
+	    NULL, draw)