1 files changed, 82 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/mask-alpha.c b/libs/cairo-1.16.0/test/mask-alpha.c
new file mode 100644
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+++ b/libs/cairo-1.16.0/test/mask-alpha.c
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+/*
+ * 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"
+
+#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).
+ */
+
+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;
+}
+
+CAIRO_TEST (mask_alpha,
+	    "A simple test painting a group through a circle mask",
+	    "mask, alpha", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, HEIGHT,
+	    NULL, draw)