Add mask-alpha test

4 files changed, 92 insertions, 0 deletions

diff --git a/test/.gitignore b/test/.gitignore
index 6553274c5..23026b677 100644
--- a/test/.gitignore
+++ b/test/.gitignore
@@ -76,6 +76,7 @@ linear-gradient
 linear-gradient-reflect
 long-lines
 mask
+mask-alpha
 mask-ctm
 mask-surface-ctm
 move-to-show-surface
diff --git a/test/Makefile.am b/test/Makefile.am
index ee789d8a8..e08f61c53 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -59,6 +59,7 @@ linear-gradient			\
 linear-gradient-reflect		\
 long-lines			\
 mask				\
+mask-alpha			\
 mask-ctm			\
 mask-surface-ctm		\
 move-to-show-surface		\
diff --git a/test/mask-alpha-ref.png b/test/mask-alpha-ref.png
new file mode 100644
index 000000000..715a959e0
--- /dev/null
+++ b/test/mask-alpha-ref.png
diff --git a/test/mask-alpha.c b/test/mask-alpha.c
new file mode 100644
index 000000000..de5394d27
--- /dev/null
+++ b/test/mask-alpha.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright © 2007 Adrian Johnson
+ *
+ * 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>
+ */
+
+#include "cairo-test.h"
+
+static cairo_test_draw_function_t draw;
+
+#define SIZE 40
+#define PAD 2
+#define WIDTH (PAD + SIZE + PAD)
+#define HEIGHT WIDTH
+
+/* This test is designed to test that PDF viewers use the correct
+ * alpha values in an Alpha SMasks. Some viewers use the color values
+ * instead of the alpha. The test draws a triangle and rectangle in a
+ * group then draws the group using cairo_mask(). The mask consists of
+ * a circle with the rgba (0.4, 0.4, 0.4, 0.8) and the background rgba
+ * (0.8, 0.8, 0.8, 0.4).
+ */
+
+cairo_test_t test = {
+    "mask-alpha",
+    "A simple test painting a group through a circle mask",
+    WIDTH, HEIGHT,
+    draw
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_pattern_t *pattern;
+
+    cairo_translate (cr, PAD, PAD);
+
+    /* mask */
+    cairo_push_group (cr);
+    cairo_set_source_rgba (cr, 0.8, 0.8, 0.8, 0.4);
+    cairo_paint (cr);
+    cairo_arc (cr, SIZE / 2, SIZE / 2, SIZE / 6, 0., 2. * M_PI);
+    cairo_set_source_rgba (cr, 0.4, 0.4, 0.4, 0.8);
+    cairo_fill (cr);
+    pattern = cairo_pop_group (cr);
+
+    /* source */
+    cairo_push_group (cr);
+    cairo_rectangle (cr, 0.3 * SIZE, 0.2 * SIZE, 0.5 * SIZE, 0.5 * SIZE);
+    cairo_set_source_rgb (cr, 0, 0, 1);
+    cairo_fill (cr);
+    cairo_move_to     (cr,   0.0,          0.8 * SIZE);
+    cairo_rel_line_to (cr,   0.7 * SIZE,   0.0);
+    cairo_rel_line_to (cr, -0.375 * SIZE, -0.6 * SIZE);
+    cairo_close_path (cr);
+    cairo_set_source_rgb (cr, 0, 1, 0);
+    cairo_fill (cr);
+    cairo_pop_group_to_source (cr);
+
+    cairo_mask (cr, pattern);
+    cairo_pattern_destroy (pattern);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}