test: add linear-gradient-extend and radial-gradient-extend

Check that constant gradient to solid color optimization are only
applied if the extents permit it.

test/Makefile.sources

@@ -137,6 +137,7 @@ test_sources = \
 	line-width-scale.c				\
 	line-width-zero.c				\
 	linear-gradient.c				\
+	linear-gradient-extend.c			\
 	linear-gradient-reflect.c			\
 	linear-gradient-subset.c			\
 	linear-step-function.c				\
@@ -180,6 +181,7 @@ test_sources = \
 	push-group.c					\
 	push-group-color.c				\
 	radial-gradient.c				\
+	radial-gradient-extend.c			\
 	radial-gradient-source.c			\
 	radial-gradient-mask.c				\
 	radial-gradient-mask-source.c			\

test/linear-gradient-extend.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2010 Andrea Canciani
+ *
+ * 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
+ * Andrea Canciani not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Andrea Canciani makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * ANDREA CANCIANI DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL ANDREA CANCIANI 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: 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 i, 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 (0, 2*PAD, 0, HEIGHT - 2*PAD);
+
+    cairo_pattern_add_color_stop_rgb (pattern, 0, 0, 0, 1);
+    cairo_pattern_add_color_stop_rgb (pattern, 1, 0, 0, 1);
+
+    cairo_translate (cr, PAD, PAD);
+
+    for (i = 0; i < 2; i++) {
+        cairo_save (cr);
+
+	for (j = 0; j < NUM_EXTEND; j++) {
+	    cairo_pattern_set_extend (pattern, extend[j]);
+
+	    cairo_reset_clip (cr);
+	    cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
+	    cairo_clip (cr);
+
+	    if (i & 1) {
+	        cairo_set_source_rgb (cr, 0, 1, 0);
+		cairo_mask (cr, pattern);
+	    } else {
+	        cairo_set_source (cr, pattern);
+	        cairo_paint (cr);
+	    }
+
+	    cairo_translate (cr, WIDTH+PAD, 0);
+	}
+
+	cairo_restore (cr);
+	cairo_translate (cr, 0, HEIGHT+PAD);
+    }
+
+    cairo_pattern_destroy (pattern);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (linear_gradient_extend,
+	    "Tests gradient to solid reduction of linear gradients",
+	    "radial, pattern, extend", /* keywords */
+	    NULL, /* requirements */
+	    (WIDTH+PAD) * NUM_EXTEND + PAD, 2*(HEIGHT + PAD) + PAD,
+	    NULL, draw)

test/radial-gradient-extend.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2010 Andrea Canciani
+ *
+ * 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
+ * Andrea Canciani not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Andrea Canciani makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * ANDREA CANCIANI DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL ANDREA CANCIANI 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: 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 i, 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_radial (WIDTH / 2, HEIGHT / 2, 0, WIDTH / 2, HEIGHT / 2, 2 * PAD);
+
+    cairo_pattern_add_color_stop_rgb (pattern, 0, 0, 0, 1);
+    cairo_pattern_add_color_stop_rgb (pattern, 1, 0, 0, 1);
+
+    cairo_translate (cr, PAD, PAD);
+
+    for (i = 0; i < 2; i++) {
+        cairo_save (cr);
+
+	for (j = 0; j < NUM_EXTEND; j++) {
+	    cairo_pattern_set_extend (pattern, extend[j]);
+
+	    cairo_reset_clip (cr);
+	    cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
+	    cairo_clip (cr);
+
+	    if (i & 1) {
+	        cairo_set_source_rgb (cr, 0, 1, 0);
+		cairo_mask (cr, pattern);
+	    } else {
+	        cairo_set_source (cr, pattern);
+	        cairo_paint (cr);
+	    }
+
+	    cairo_translate (cr, WIDTH+PAD, 0);
+	}
+
+	cairo_restore (cr);
+	cairo_translate (cr, 0, HEIGHT+PAD);
+    }
+
+    cairo_pattern_destroy (pattern);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (radial_gradient_extend,
+	    "Tests gradient to solid reduction of radial gradients",
+	    "radial, pattern, extend", /* keywords */
+	    NULL, /* requirements */
+	    (WIDTH+PAD) * NUM_EXTEND + PAD, 2*(HEIGHT + PAD) + PAD,
+	    NULL, draw)