test: Add subsurface-outside-target

This test defines the behavior of subsurfaces when they are created to
be bigger than their target.

test/Makefile.sources

@@ -251,6 +251,7 @@ test_sources = \
 	subsurface-pad.c                                \
 	subsurface-modify-child.c                       \
 	subsurface-modify-parent.c                      \
+	subsurface-outside-target.c                     \
 	subsurface-similar-repeat.c                     \
 	surface-finish-twice.c				\
 	surface-pattern.c				\

test/subsurface-outside-target.c

@@ -0,0 +1,178 @@
+/*
+ * Copyright 2010 Red Hat Inc.
+ *
+ * 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"
+
+#define ARRAY_LENGTH(array) (sizeof (array) / sizeof ((array)[0]))
+
+#define TARGET_SIZE 10
+
+#define SUB_SIZE 15
+#define SUB_OFFSET -5
+
+#define PAINT_OFFSET SUB_SIZE
+#define PAINT_SIZE (3 * SUB_SIZE)
+
+static cairo_content_t contents[] = { CAIRO_CONTENT_ALPHA,
+                                      CAIRO_CONTENT_COLOR,
+                                      CAIRO_CONTENT_COLOR_ALPHA };
+
+#define N_CONTENTS ARRAY_LENGTH (contents)
+#define N_PADS (CAIRO_EXTEND_PAD + 1)
+
+
+static cairo_surface_t *
+create_target (cairo_surface_t *similar_to,
+               cairo_content_t content)
+{
+    cairo_surface_t *surface;
+    cairo_t *cr;
+
+    surface = cairo_surface_create_similar (similar_to,
+                                            content,
+                                            TARGET_SIZE, TARGET_SIZE);
+    
+    cr = cairo_create (surface);
+    cairo_test_paint_checkered (cr);
+    cairo_destroy (cr);
+
+    return surface;
+}
+
+static cairo_test_status_t
+check_surface_extents (const cairo_test_context_t *ctx,
+                       cairo_surface_t *           surface,
+                       double                      x,
+                       double                      y,
+                       double                      width,
+                       double                      height)
+{
+    double x1, y1, x2, y2;
+    cairo_t *cr;
+
+    cr = cairo_create (surface);
+    cairo_clip_extents (cr, &x1, &y1, &x2, &y2);
+
+    if (x != x1 ||
+        y != y1 ||
+        width != x2 - x1 ||
+        height != y2 - y1) {
+        cairo_test_log (ctx,
+                        "surface extents should be (%g, %g, %g, %g), but are (%g, %g, %g, %g)\n",
+                        x, y, width, height,
+                        x1, y1, x2 - x1, y2 - y1);
+        return CAIRO_TEST_FAILURE;
+    }
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+static cairo_test_status_t
+draw_for_size (cairo_t *cr,
+               double   x,
+               double   y)
+{
+    cairo_surface_t *target, *subsurface;
+    cairo_extend_t extend;
+    cairo_test_status_t check, result = CAIRO_TEST_SUCCESS;
+    unsigned int content;
+
+    for (content = 0; content < N_CONTENTS; content++) {
+        cairo_save (cr);
+
+        /* create a target surface for our subsurface */
+        target = create_target (cairo_get_target (cr),
+                                contents[content]);
+
+        /* create a subsurface that extends the target surface */
+        subsurface = cairo_surface_create_for_rectangle (target, 
+                                                         x, y,
+                                                         SUB_SIZE, SUB_SIZE);
+
+        /* ensure the extents are ok */
+        check = check_surface_extents (cairo_test_get_context (cr),
+                                       subsurface,
+                                       0, 0,
+                                       SUB_SIZE, SUB_SIZE);
+        if (result == CAIRO_TEST_SUCCESS)
+          result = check;
+
+        /* paint this surface with all extend modes. */
+        for (extend = 0; extend < N_PADS; extend++) {
+            cairo_save (cr);
+
+            cairo_rectangle (cr, 0, 0, PAINT_SIZE, PAINT_SIZE);
+            cairo_clip (cr);
+
+            cairo_set_source_surface (cr, subsurface, PAINT_OFFSET, PAINT_OFFSET);
+            cairo_pattern_set_extend (cairo_get_source (cr), extend);
+            cairo_paint (cr);
+
+            cairo_restore (cr);
+
+            cairo_translate (cr, PAINT_SIZE + TARGET_SIZE, 0);
+        }
+
+        cairo_surface_destroy (subsurface);
+        cairo_surface_destroy (target);
+
+        cairo_restore (cr);
+
+        cairo_translate (cr, 0, PAINT_SIZE + TARGET_SIZE);
+    }
+
+    return result;
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_test_status_t check, result = CAIRO_TEST_SUCCESS;
+
+    /* paint background in nice gray */
+    cairo_set_source_rgb (cr, 0.51613, 0.55555, 0.51613);
+    cairo_paint (cr);
+
+    /* Use CAIRO_OPERATOR_SOURCE in the tests so we get the actual
+     * contents of the subsurface */
+    cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+
+    result = draw_for_size (cr, SUB_OFFSET, SUB_OFFSET);
+
+    check = draw_for_size (cr, 0, 0);
+    if (result == CAIRO_TEST_SUCCESS)
+      result = check;
+
+    return result;
+}
+
+CAIRO_TEST (subsurface_outside_target,
+	    "Tests contents of subsurfaces outside target area",
+	    "subsurface, pad", /* keywords */
+	    NULL, /* requirements */
+	    (PAINT_SIZE + TARGET_SIZE) * N_PADS         - TARGET_SIZE,
+            (PAINT_SIZE + TARGET_SIZE) * N_CONTENTS * 2 - TARGET_SIZE,
+	    NULL, draw)