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/* imagediff - Compare two images
*
* Copyright © 2004 Richard D. Worth
*
* 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 Richard Worth
* not be used in advertising or publicity pertaining to distribution
* of the software without specific, written prior permission.
* Richard Worth makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* RICHARD WORTH DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
* NO EVENT SHALL RICHARD WORTH 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: Richard D. Worth <richard@theworths.org> */
#ifndef BUFFER_DIFF_H
#define BUFFER_DIFF_H
struct diff_results {
int pixels_changed;
int max_difference;
};
/* Returns number of pixels changed, (or -1 on error).
* Also fills in a "diff" buffer intended to visually show where the
* images differ.
*/
struct diff_results
buffer_diff (unsigned char *buf_a,
unsigned char *buf_b,
unsigned char *buf_diff,
int width,
int height,
int stride);
struct diff_results
image_buf_diff (void *buf_a, int width_a, int height_a, int stride_a,
const char *filename_a,
const char *filename_b,
const char *filename_diff);
/* Returns number of pixels changed, (or -1 on error).
* Also saves a "diff" image intended to visually show where the
* images differ.
*/
int
image_diff (const char *filename_a,
const char *filename_b,
const char *filename_diff);
#endif
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