Add new scale-down-source-surface-paint test

This new test case demonstrates a bug in the PDF backend, (source
surface patterns are repeated even with a pattern extend of NONE).

Thanks to Romuald <mydevel@free.fr> and Claudio Saavedra
<csaavedra@alumnos.utalca.cl> for pointing out the bug.

test/.gitignore

@@ -107,6 +107,7 @@ pthread-show-text
 rectangle-rounding-error
 rectilinear-stroke
 rel-path
+scale-down-source-surface-paint
 scale-source-surface-paint
 select-font-face
 select-font-no-show-text

test/Makefile.am

@@ -72,6 +72,7 @@ pixman-rotate			\
 random-intersections		\
 rectangle-rounding-error	\
 rectilinear-stroke		\
+scale-down-source-surface-paint	\
 scale-source-surface-paint	\
 select-font-face		\
 select-font-no-show-text	\
@@ -293,6 +294,7 @@ rectilinear-stroke-ref.png				\
 rel-path-ref.png					\
 rel-path-rgb24-ref.png					\
 romedalen.png						\
+scale-down-source-surface-paint-ref.png			\
 scale-source-surface-paint-ref.png			\
 scale-source-surface-paint-rgb24-ref.png		\
 scale-source-surface-paint-pdf-argb32-ref.png		\

test/scale-down-source-surface-paint.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright © 2005,2007 Red Hat, Inc.
+ *
+ * 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
+ * Red Hat, Inc. not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Red Hat, Inc. makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL RED HAT, INC. 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: Carl D. Worth <cworth@cworth.org>
+ */
+
+#include "cairo-test.h"
+
+static cairo_test_draw_function_t draw;
+
+cairo_test_t test = {
+    "scale-down-source-surface-paint",
+    "Test call sequence: cairo_scale; cairo_set_source_surface; cairo_paint, with a scale < 1.0",
+    6, 6,
+    draw
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_surface_t *surface;
+    static uint32_t data[16] = {
+	0xffffffff, 0xffffffff,		0xffff0000, 0xffff0000,
+	0xffffffff, 0xffffffff,		0xffff0000, 0xffff0000,
+
+	0xff00ff00, 0xff00ff00,		0xff0000ff, 0xff0000ff,
+	0xff00ff00, 0xff00ff00,		0xff0000ff, 0xff0000ff
+    };
+
+    /* First paint opaque background (black) so we don't need separate
+     * ARGB32 and RGB24 reference images. */
+    cairo_set_source_rgb (cr, 0, 0, 0); /* black */
+    cairo_paint (cr);
+
+    surface = cairo_image_surface_create_for_data ((unsigned char *) data,
+						   CAIRO_FORMAT_RGB24, 4, 4, 16);
+
+    cairo_scale (cr, 0.5, 0.5);
+
+    cairo_set_source_surface (cr, surface, 4, 4);
+    cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
+    cairo_paint (cr);
+
+    cairo_surface_destroy (surface);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}