Add push-group test and reference images

test/push-group.c

@@ -0,0 +1,119 @@
+/*
+ * Copyright © 2005 Mozilla 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>
+ */
+
+
+#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
+
+cairo_test_t test = {
+    "push-group",
+    "Verify that cairo_push_group works.",
+    WIDTH, HEIGHT
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_pattern_t *gradient;
+    int i, j;
+
+    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);
+
+    for (j = 0; j < 1; j++) {
+        for (i = 0; i < 1; i++) {
+            double x = (i * UNIT_SIZE) + (i + 1) * PAD;
+            double y = (j * UNIT_SIZE) + (j + 1) * PAD;
+            cairo_pattern_t *group_pattern;
+
+            cairo_save (cr);
+
+            cairo_translate (cr, x, y);
+
+            /* 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));
+            cairo_set_source (cr, gradient);
+            cairo_fill (cr);
+            cairo_restore (cr);
+
+            /* 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 (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);
+
+            cairo_pop_group_to_source (cr);
+            cairo_paint_with_alpha (cr, 0.5);
+
+            cairo_restore (cr);
+        }
+    }
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test, draw);
+}