add cairo

1 files changed, 73 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/test/buffer-diff.h b/libs/cairo-1.16.0/test/buffer-diff.h
new file mode 100644
index 0000000..2cbb895
--- /dev/null
+++ b/libs/cairo-1.16.0/test/buffer-diff.h
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+/* imagediff - Compare two images
+ *
+ * Copyright © 2004 Richard D. Worth
+ * Copyright © 2006 Red Hat, Inc.
+ *
+ * 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 authors
+ * not be used in advertising or publicity pertaining to distribution
+ * of the software without specific, written prior permission.
+ * The authors make no representations about the suitability of this
+ * software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ * THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
+ * NO EVENT SHALL THE AUTHORS 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.
+ *
+ * Authors: Richard D. Worth <richard@theworths.org>
+ *	    Carl Worth <cworth@cworth.org>
+ */
+
+#ifndef BUFFER_DIFF_H
+#define BUFFER_DIFF_H
+
+#include "cairo-test.h"
+
+typedef struct _buffer_diff_result {
+    unsigned int pixels_changed;
+    unsigned int max_diff;
+} buffer_diff_result_t;
+
+/* Compares two image buffers ignoring the alpha channel.
+ *
+ * Provides number of pixels changed and maximum single-channel
+ * difference in result.
+ *
+ * Also fills in a "diff" buffer intended to visually show where the
+ * images differ.
+ */
+void
+buffer_diff_noalpha (const unsigned char *buf_a,
+		     const unsigned char *buf_b,
+		     unsigned char *buf_diff,
+		     int	    width,
+		     int	    height,
+		     int	    stride,
+		     buffer_diff_result_t *result);
+
+/* The central algorithm to compare two images, and return the differences
+ * in the surface_diff.
+ *
+ * Provides number of pixels changed and maximum single-channel
+ * difference in result.
+ */
+cairo_status_t
+image_diff (const cairo_test_context_t *ctx,
+	    cairo_surface_t *surface_a,
+	    cairo_surface_t *surface_b,
+	    cairo_surface_t *surface_diff,
+	    buffer_diff_result_t *result);
+
+cairo_bool_t
+image_diff_is_failure (const buffer_diff_result_t *result,
+                       unsigned int                tolerance);
+
+#endif