[test] Add regression test for 005436

Jeff Muizelaar found a regression in commit 005436 and submitted this
little test to exercise it. The essence of the bug appears to be wrt to
the product of the CTM and device transform matrices.

test/Makefile.sources

@@ -126,6 +126,7 @@ test_sources = \
 	paint-repeat.c					\
 	paint-source-alpha.c				\
 	paint-with-alpha.c				\
+	path-append.c					\
 	path-precision.c				\
 	pattern-get-type.c				\
 	pattern-getters.c				\

test/path-append.c

@@ -0,0 +1,81 @@
+/*
+ * Copyright © 2009 Jeff Muizelaar
+ * Copyright © 2009 Chris Wilson
+ *
+ * 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 the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS 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.
+ */
+
+#include <stdlib.h>
+#include "cairo-test.h"
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_matrix_t m;
+    int xoffset = 50;
+    int yoffset = 50;
+
+    cairo_surface_t *shadow;
+    cairo_t *shadow_cr;
+    cairo_path_t *path;
+
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+    cairo_translate (cr, 130, 130);
+    cairo_rotate (cr, .5);//2*M_PI*angle/360);
+    cairo_rectangle (cr, 0, 0, 50, 100);
+    cairo_get_matrix (cr, &m);
+
+    shadow = cairo_surface_create_similar (cairo_get_target (cr),
+					   CAIRO_CONTENT_COLOR_ALPHA,
+					   600 - xoffset,
+					   600 - yoffset);
+    cairo_surface_set_device_offset (shadow, xoffset, yoffset);
+    shadow_cr = cairo_create (shadow);
+    cairo_surface_destroy (shadow);
+
+    cairo_set_source_rgb (shadow_cr, 0, 1, 0);
+    cairo_set_matrix (shadow_cr, &m);
+
+    path = cairo_copy_path (cr);
+    cairo_new_path (shadow_cr);
+    cairo_append_path (shadow_cr, path);
+    cairo_fill (shadow_cr);
+    cairo_path_destroy (path);
+
+    cairo_identity_matrix (cr);
+    cairo_translate (cr, 10, 50);
+    cairo_set_source_surface (cr, cairo_get_target (shadow_cr), 0, 0);
+    cairo_paint (cr);
+    cairo_set_matrix (cr, &m);
+    cairo_set_source_rgb (cr, 1, 0, 0);
+    cairo_fill (cr);
+
+    cairo_destroy (shadow_cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (path_append,
+	    "Test appending path to a context, in particular to exercise a regression in 005436",
+	    "path", /* keywords */
+	    NULL, /* requirements */
+	    600, 600,
+	    NULL, draw)