test: Add subsurface-modify-{child,parent}

Add tests to ensure that modifications to the subsurface via the
original surface are tracked by the subsurface, i.e. that any snapshots
are detached upon modification of the parent as well as modification of
itself and vice versa.

test/Makefile.am

@@ -1075,6 +1075,8 @@ REFERENCE_IMAGES = \
 	subsurface.image16.ref.png \
 	subsurface-reflect.ref.png \
 	subsurface-repeat.ref.png \
+	subsurface-modify-child.ref.png \
+	subsurface-modify-parent.ref.png \
 	subsurface-similar-repeat.ref.png \
 	surface-pattern-big-scale-down.ref.png \
 	surface-pattern-big-scale-down.ps.xfail.png \

test/Makefile.sources

@@ -228,6 +228,8 @@ test_sources = \
 	subsurface.c                                    \
 	subsurface-repeat.c                             \
 	subsurface-reflect.c                            \
+	subsurface-modify-child.c                       \
+	subsurface-modify-parent.c                      \
 	subsurface-similar-repeat.c                     \
 	surface-finish-twice.c				\
 	surface-pattern.c				\

test/subsurface-modify-child.c

@@ -0,0 +1,98 @@
+/*
+ * Copyright 2010 Intel 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
+ * Intel not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Intel makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * INTEL CORPORATION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL INTEL 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: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_surface_t *region, *similar;
+    cairo_t *cr_region, *cr_similar;
+
+    cairo_set_source_rgb (cr, .5, .5, .5);
+    cairo_paint (cr);
+
+    similar = cairo_surface_create_similar (cairo_get_target (cr),
+					    CAIRO_CONTENT_COLOR_ALPHA,
+					    20, 20);
+
+    /* copy the centre */
+    cr_similar = cairo_create (similar);
+    cairo_surface_destroy (similar);
+    cairo_set_source_surface (cr_similar, cairo_get_target (cr), -20, -20);
+    cairo_paint (cr_similar);
+    similar = cairo_surface_reference (cairo_get_target (cr_similar));
+    cairo_destroy (cr_similar);
+
+    /* fill the centre */
+    region = cairo_surface_create_for_rectangle (cairo_get_target (cr),
+						 20, 20, 20, 20);
+    cr_region = cairo_create (region);
+    cairo_surface_destroy (region);
+
+    cairo_set_source_rgb (cr_region, 1, 1, 1);
+    cairo_rectangle (cr_region, 0, 0, 10, 10);
+    cairo_fill (cr_region);
+
+    cairo_set_source_rgb (cr_region, 1, 0, 0);
+    cairo_rectangle (cr_region, 10, 0, 10, 10);
+    cairo_fill (cr_region);
+
+    cairo_set_source_rgb (cr_region, 0, 1, 0);
+    cairo_rectangle (cr_region, 0, 10, 10, 10);
+    cairo_fill (cr_region);
+
+    cairo_set_source_rgb (cr_region, 0, 0, 1);
+    cairo_rectangle (cr_region, 10, 10, 10, 10);
+    cairo_fill (cr_region);
+
+    cairo_destroy (cr_region);
+
+    /* copy the centre, again */
+    cr_similar = cairo_create (similar);
+    cairo_surface_destroy (similar);
+    cairo_set_source_surface (cr_similar, cairo_get_target (cr), -20, -20);
+    cairo_paint (cr_similar);
+    similar = cairo_surface_reference (cairo_get_target (cr_similar));
+    cairo_destroy (cr_similar);
+
+    /* repeat the pattern around the outside, but do not overwrite...*/
+    cairo_set_source_surface (cr, similar, 20, 20);
+    cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_REPEAT);
+    cairo_rectangle (cr, 0, 0, width, height);
+    cairo_rectangle (cr, 20, 40, 20, -20);
+    cairo_fill (cr);
+
+    cairo_surface_destroy (similar);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (subsurface_modify_child,
+	    "Tests source clipping with later modifications",
+	    "subsurface", /* keywords */
+	    NULL, /* requirements */
+	    60, 60,
+	    NULL, draw)

test/subsurface-modify-parent.c

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2010 Intel 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
+ * Intel not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Intel makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * INTEL CORPORATION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL INTEL 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: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_surface_t *region;
+
+    cairo_set_source_rgb (cr, .5, .5, .5);
+    cairo_paint (cr);
+
+    /* fill the centre, but through the *original* surface */
+    region = cairo_surface_create_for_rectangle (cairo_get_target (cr),
+						 20, 20, 20, 20);
+
+    /* first trigger a snapshot of the region... */
+    cairo_set_source_surface (cr, region, 20, 20);
+    cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_REPEAT);
+    cairo_paint (cr);
+
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_rectangle (cr, 20, 20, 10, 10);
+    cairo_fill (cr);
+
+    cairo_set_source_rgb (cr, 1, 0, 0);
+    cairo_rectangle (cr, 30, 20, 10, 10);
+    cairo_fill (cr);
+
+    cairo_set_source_rgb (cr, 0, 1, 0);
+    cairo_rectangle (cr, 20, 30, 10, 10);
+    cairo_fill (cr);
+
+    cairo_set_source_rgb (cr, 0, 0, 1);
+    cairo_rectangle (cr, 30, 30, 10, 10);
+    cairo_fill (cr);
+
+    cairo_set_source_surface (cr, region, 20, 20);
+
+    /* repeat the pattern around the outside, but do not overwrite...*/
+    cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_REPEAT);
+    cairo_rectangle (cr, 0, 0, width, height);
+    cairo_rectangle (cr, 20, 40, 20, -20);
+    cairo_fill (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (subsurface_modify_parent,
+	    "Tests source clipping with later modifications",
+	    "subsurface", /* keywords */
+	    NULL, /* requirements */
+	    60, 60,
+	    NULL, draw)