[test] Add huge pattern.

Add a test case to exercise range overflow during gradient construction.

test/.gitignore

@@ -100,6 +100,7 @@ gradient-alpha
 gradient-constant-alpha
 gradient-zero-stops
 group-paint
+huge-pattern
 imagediff
 image-surface-source
 infinite-join

test/Makefile.am

@@ -77,6 +77,7 @@ gradient-alpha$(EXEEXT)					\
 gradient-constant-alpha$(EXEEXT)			\
 gradient-zero-stops$(EXEEXT)				\
 group-paint$(EXEEXT)					\
+huge-pattern$(EXEEXT)					\
 image-surface-source$(EXEEXT)				\
 infinite-join$(EXEEXT)					\
 in-fill-empty-trapezoid$(EXEEXT)			\
@@ -539,6 +540,7 @@ REFERENCE_IMAGES = \
 	gradient-zero-stops-ref.png	\
 	gradient-zero-stops-rgb24-ref.png	\
 	group-paint-ref.png	\
+	huge-pattern-ref.png	\
 	image-surface-source-ref.png \
 	infinite-join-ref.png	\
 	infinite-join-ps2-ref.png	\
@@ -945,6 +947,7 @@ $(REFERENCE_IMAGES)
 #                         room, with Carl as a moderator and not let them out
 #                         until they have come up with an interface and
 #                         semantics that actually work. :-)
+# huge-pattern          - range overflow of fixed-point
 # long-lines            - range overflow of fixed-point
 # self-copy-overlap     - vector surfaces take snapshot of patterns in contrast
 #                         to the raster backends which don't. One solution
@@ -968,6 +971,7 @@ degenerate-path$(EXEEXT)			\
 device-offset-scale$(EXEEXT)			\
 extend-pad$(EXEEXT)				\
 fallback-resolution$(EXEEXT)			\
+huge-pattern$(EXEEXT)				\
 long-lines$(EXEEXT)				\
 self-copy-overlap$(EXEEXT)			\
 self-intersecting$(EXEEXT)			\

test/huge-pattern.c

@@ -0,0 +1,74 @@
+/*
+ * Copyright © 2006 Benjamin Otte
+ *
+ * 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: Benjamin Otte <otte@gnome.org>
+ */
+
+#include "cairo-test.h"
+
+static cairo_test_draw_function_t draw;
+
+static const cairo_test_t test = {
+    "huge-pattern",
+    "Test huge linear patterns"
+    "\nhuge patterns seem to not be drawn correctly",
+    600, 350,
+    draw
+};
+
+/* set this to 0.1 to make this test work */
+#define FACTOR 1
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_pattern_t *pattern;
+    cairo_matrix_t mat = {
+	0, -4.5254285714285709 * FACTOR,
+	-2.6398333333333333 * FACTOR, 0,
+	0, 0
+    };
+
+    pattern = cairo_pattern_create_linear (-16384 * FACTOR, 0,
+					    16384 * FACTOR, 0);
+    cairo_pattern_add_color_stop_rgba (pattern,
+				       0, 0.376471, 0.533333, 0.27451, 1);
+    cairo_pattern_add_color_stop_rgba (pattern, 1, 1, 1, 1, 1);
+    cairo_pattern_set_matrix (pattern, &mat);
+
+    cairo_scale (cr, 0.05, 0.05);
+    cairo_translate (cr, 6000, 3500);
+
+    cairo_set_source (cr, pattern);
+    cairo_rectangle (cr, -6000, -3500, 12000, 7000);
+    cairo_pattern_destroy (pattern);
+    cairo_fill (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}