Add src-clip test case to demonstrate bug with clipping applying to a source surface.

test/Makefile.am

@@ -66,6 +66,7 @@ set-source			\
 show-text-current-point		\
 source-clip			\
 source-surface-scale-paint	\
+src-clip			\
 surface-finish-twice		\
 surface-pattern			\
 text-antialias-gray		\

test/src-clip.c

@@ -0,0 +1,100 @@
+/*
+ * Copyright © 2005 Mozilla Corporation
+ *
+ * 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
+ * Mozilla Corporation not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Mozilla Corporation makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * MOZILLA CORPORATION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL MOZILLA CORPORATION 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: Vladimir Vukicevic <vladimir@pobox.com>
+ */
+
+#include <math.h>
+#include "cairo-test.h"
+#include <stdio.h>
+
+#define SIZE 40
+
+static cairo_test_draw_function_t draw;
+
+cairo_test_t test = {
+    "src-clip",
+    "Test a leftover clip on a source surface not affecting compositing",
+    SIZE * 2, SIZE,
+    draw
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_surface_t *surf2;
+    cairo_t *cr2;
+
+    /* cr: Fill the destination with our red background that should
+     * get covered
+     */
+    cairo_set_source_rgb (cr, 1, 0, 0);
+    cairo_paint (cr);
+
+    surf2 = cairo_surface_create_similar (cairo_get_target (cr), CAIRO_CONTENT_COLOR_ALPHA, SIZE, SIZE);
+    cr2 = cairo_create (surf2);
+
+    /* cr2: Fill temp surface with green */
+    cairo_set_source_rgb (cr2, 0, 1, 0);
+    cairo_paint (cr2);
+
+    /* cr2: Make a blue square in the middle */
+    cairo_set_source_rgb (cr2, 0, 0, 2);
+    cairo_save (cr2);
+    cairo_new_path (cr2);
+    cairo_rectangle (cr2, 10, 10, SIZE-20, SIZE-20);
+    cairo_clip (cr2);
+    cairo_paint (cr2);
+    cairo_restore (cr2);
+
+    /* If this is uncommented, the test works as expected, because this
+     * forces the clip to be reset on surf2.
+     */
+    /*
+       cairo_new_path (cr2);
+       cairo_rectangle (cr2, 0, 0, 0, 0);
+       cairo_fill (cr2);
+    */
+
+    /* If this scale is commented out, the test displays
+     * the green-and-blue square on the left side of the result.
+     *
+     * The correct "pass" image is the green-and-blue square image stretched
+     * by 2x.  With this scale, however, only the blue (clipped) portion
+     * of the src shows through.
+     */
+    cairo_scale (cr, 2.0, 1.0);
+
+    cairo_set_source_surface (cr, surf2, 0, 0);
+    cairo_paint (cr);
+
+    cairo_destroy (cr2);
+    cairo_surface_destroy (surf2);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}