test: add degenerate gradient and single stop tests

Add tests for degeneratate linear gradients (with start point equal
to the end point), degenerate radial gradients (start radius and end
radius equal to zero, same start and end circle) and gradients (both
linear and radial) with just a single stop.

1 files changed, 81 insertions, 0 deletions

diff --git a/test/degenerate-linear-gradient.c b/test/degenerate-linear-gradient.c
new file mode 100644
index 000000000..0d174fc89
--- /dev/null
+++ b/test/degenerate-linear-gradient.c
@@ -0,0 +1,81 @@
+/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
+/*
+ * Copyright 2010 Andrea Canciani
+ *
+ * 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: Andrea Canciani <ranma42@gmail.com>
+ */
+
+#include "cairo-test.h"
+
+#define NUM_EXTEND 4
+#define HEIGHT 16
+#define WIDTH 16
+#define PAD 3
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_pattern_t *pattern;
+    unsigned int j;
+
+    cairo_extend_t extend[NUM_EXTEND] = {
+	CAIRO_EXTEND_NONE,
+	CAIRO_EXTEND_REPEAT,
+	CAIRO_EXTEND_REFLECT,
+	CAIRO_EXTEND_PAD
+    };
+
+    cairo_test_paint_checkered (cr);
+
+    pattern = cairo_pattern_create_linear (WIDTH/2, HEIGHT/2, WIDTH/2, HEIGHT/2);
+
+    cairo_pattern_add_color_stop_rgba (pattern, 0, 1, 0, 0, 1);
+    cairo_pattern_add_color_stop_rgba (pattern, sqrt (1.0 / 2.0), 0, 1, 0, 0);
+    cairo_pattern_add_color_stop_rgba (pattern, 1, 0, 0, 1, 0.5);
+
+    cairo_translate (cr, PAD, PAD);
+
+    for (j = 0; j < NUM_EXTEND; j++) {
+	cairo_reset_clip (cr);
+	cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
+	cairo_clip (cr);
+	
+	cairo_pattern_set_extend (pattern, extend[j]);
+	
+	cairo_set_source (cr, pattern);
+	cairo_paint (cr);
+	
+	cairo_translate (cr, WIDTH+PAD, 0);
+    }
+
+    cairo_pattern_destroy (pattern);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (degenerate_linear_gradient,
+	    "Tests degenerate linear gradients",
+	    "linear, pattern, extend", /* keywords */
+	    NULL, /* requirements */
+	    (WIDTH+PAD) * NUM_EXTEND + PAD, 1*(HEIGHT + PAD) + PAD,
+	    NULL, draw)