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-rw-r--r--test/clip-polygons.c112
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diff --git a/test/clip-polygons.c b/test/clip-polygons.c
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+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * 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: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+#define STEP 5
+#define WIDTH 100
+#define HEIGHT 100
+
+static void diamond (cairo_t *cr)
+{
+ cairo_move_to (cr, WIDTH/2, 0);
+ cairo_line_to (cr, WIDTH, HEIGHT/2);
+ cairo_line_to (cr, WIDTH/2, HEIGHT);
+ cairo_line_to (cr, 0, HEIGHT/2);
+ cairo_close_path (cr);
+}
+
+static void background (cairo_t *cr)
+{
+ cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+ cairo_set_source_rgb (cr, 1,1,1);
+ cairo_paint (cr);
+ cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+ cairo_set_source_rgb (cr, 0,0,0);
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ background (cr);
+
+ /* completely overlapping diamonds */
+ cairo_save (cr);
+ diamond (cr);
+ cairo_clip (cr);
+ diamond (cr);
+ cairo_clip (cr);
+ cairo_paint (cr);
+ cairo_restore (cr);
+
+ cairo_translate (cr, WIDTH, 0);
+
+ /* partial overlap */
+ cairo_save (cr);
+ cairo_translate (cr, -WIDTH/4, 0);
+ diamond (cr);
+ cairo_clip (cr);
+ cairo_translate (cr, WIDTH/2, 0);
+ diamond (cr);
+ cairo_clip (cr);
+ cairo_paint (cr);
+ cairo_restore (cr);
+
+ cairo_translate (cr, WIDTH, 0);
+
+ /* no overlap, but the bounding boxes must */
+ cairo_save (cr);
+ cairo_translate (cr, -WIDTH/2 + 2, -2);
+ diamond (cr);
+ cairo_clip (cr);
+ cairo_translate (cr, WIDTH - 4, 4);
+ diamond (cr);
+ cairo_clip (cr);
+ cairo_paint (cr);
+ cairo_restore (cr);
+
+ cairo_translate (cr, WIDTH, 0);
+
+ /* completely disjoint */
+ cairo_save (cr);
+ cairo_translate (cr, -WIDTH/2 - 1, 0);
+ diamond (cr);
+ cairo_clip (cr);
+ cairo_translate (cr, WIDTH + 2, 0);
+ diamond (cr);
+ cairo_clip (cr);
+ cairo_paint (cr);
+ cairo_restore (cr);
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (clip_polygons,
+ "Test drawing through through an intersection of polygons",
+ "clip", /* keywords */
+ "target=raster", /* requirements */
+ 4*WIDTH, HEIGHT,
+ NULL, draw)