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+/*
+ * Copyright © 2008 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
+ * Chris Wilson not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Chris Wilson makes no representations about the
+ * suitability of this software for any purpose. It is provided "as
+ * is" without express or implied warranty.
+ *
+ * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL CHRIS WILSON 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"
+
+#include <assert.h>
+
+/* Test the idempotency of write_png->read_png */
+
+#define RGB_MASK 0x00ffffff
+#define BASENAME "png.out"
+
+static cairo_bool_t
+image_surface_equals (cairo_surface_t *A, cairo_surface_t *B)
+{
+ if (cairo_image_surface_get_format (A) !=
+ cairo_image_surface_get_format (B))
+ return 0;
+
+ if (cairo_image_surface_get_width (A) !=
+ cairo_image_surface_get_width (B))
+ return 0;
+
+ if (cairo_image_surface_get_height (A) !=
+ cairo_image_surface_get_height (B))
+ return 0;
+
+ return 1;
+}
+
+static const char *
+format_to_string (cairo_format_t format)
+{
+ switch (format) {
+ case CAIRO_FORMAT_A1: return "a1";
+ case CAIRO_FORMAT_A8: return "a8";
+ case CAIRO_FORMAT_RGB16_565: return "rgb16";
+ case CAIRO_FORMAT_RGB24: return "rgb24";
+ case CAIRO_FORMAT_RGB30: return "rgb30";
+ case CAIRO_FORMAT_ARGB32: return "argb32";
+ case CAIRO_FORMAT_INVALID:
+ default: return "???";
+ }
+}
+
+static void
+print_surface (const cairo_test_context_t *ctx, cairo_surface_t *surface)
+{
+ cairo_test_log (ctx,
+ "%s (%dx%d)\n",
+ format_to_string (cairo_image_surface_get_format (surface)),
+ cairo_image_surface_get_width (surface),
+ cairo_image_surface_get_height (surface));
+}
+
+static cairo_test_status_t
+preamble (cairo_test_context_t *ctx)
+{
+ cairo_surface_t *surface0, *surface1;
+ cairo_status_t status;
+ uint32_t argb32 = 0xdeadbede;
+ char *filename;
+ const char *path = cairo_test_mkdir (CAIRO_TEST_OUTPUT_DIR) ? CAIRO_TEST_OUTPUT_DIR : ".";
+
+ xasprintf (&filename, "%s/%s.png", path, BASENAME);
+ surface0 = cairo_image_surface_create_for_data ((unsigned char *) &argb32,
+ CAIRO_FORMAT_ARGB32,
+ 1, 1, 4);
+ status = cairo_surface_write_to_png (surface0, filename);
+ if (status) {
+ cairo_test_log (ctx, "Error writing '%s': %s\n",
+ filename, cairo_status_to_string (status));
+
+ cairo_surface_destroy (surface0);
+ free (filename);
+ return cairo_test_status_from_status (ctx, status);
+ }
+ surface1 = cairo_image_surface_create_from_png (filename);
+ status = cairo_surface_status (surface1);
+ if (status) {
+ cairo_test_log (ctx, "Error reading '%s': %s\n",
+ filename, cairo_status_to_string (status));
+
+ cairo_surface_destroy (surface1);
+ cairo_surface_destroy (surface0);
+ free (filename);
+ return cairo_test_status_from_status (ctx, status);
+ }
+
+ if (! image_surface_equals (surface0, surface1)) {
+ cairo_test_log (ctx, "Error surface mismatch.\n");
+ cairo_test_log (ctx, "to png: "); print_surface (ctx, surface0);
+ cairo_test_log (ctx, "from png: "); print_surface (ctx, surface1);
+
+ cairo_surface_destroy (surface0);
+ cairo_surface_destroy (surface1);
+ free (filename);
+ return CAIRO_TEST_FAILURE;
+ }
+ assert (*(uint32_t *) cairo_image_surface_get_data (surface1) == argb32);
+
+ cairo_surface_destroy (surface0);
+ cairo_surface_destroy (surface1);
+
+ surface0 = cairo_image_surface_create_for_data ((unsigned char *) &argb32,
+ CAIRO_FORMAT_RGB24,
+ 1, 1, 4);
+ status = cairo_surface_write_to_png (surface0, filename);
+ if (status) {
+ cairo_test_log (ctx, "Error writing '%s': %s\n",
+ filename, cairo_status_to_string (status));
+ cairo_surface_destroy (surface0);
+ return cairo_test_status_from_status (ctx, status);
+ }
+ surface1 = cairo_image_surface_create_from_png (filename);
+ status = cairo_surface_status (surface1);
+ free (filename);
+ if (status) {
+ cairo_test_log (ctx, "Error reading '%s': %s\n",
+ filename, cairo_status_to_string (status));
+
+ cairo_surface_destroy (surface1);
+ cairo_surface_destroy (surface0);
+ return cairo_test_status_from_status (ctx, status);
+ }
+
+ if (! image_surface_equals (surface0, surface1)) {
+ cairo_test_log (ctx, "Error surface mismatch.\n");
+ cairo_test_log (ctx, "to png: "); print_surface (ctx, surface0);
+ cairo_test_log (ctx, "from png: "); print_surface (ctx, surface1);
+
+ cairo_surface_destroy (surface0);
+ cairo_surface_destroy (surface1);
+ return CAIRO_TEST_FAILURE;
+ }
+ assert ((*(uint32_t *) cairo_image_surface_get_data (surface1) & RGB_MASK)
+ == (argb32 & RGB_MASK));
+
+ cairo_surface_destroy (surface0);
+ cairo_surface_destroy (surface1);
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (png,
+ "Check that the png export/import is idempotent.",
+ "png, api", /* keywords */
+ NULL, /* requirements */
+ 0, 0,
+ preamble, NULL)