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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> */
-
-#if HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <stdio.h>
-#include <stdlib.h>
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#include <errno.h>
-#include <string.h>
-#include <pixman.h>
-
-#include "cairo-test.h"
-
-#include "pdiff.h"
-#include "buffer-diff.h"
-
-/* Don't allow any differences greater than this value, even if pdiff
- * claims that the images are identical */
-#define PERCEPTUAL_DIFF_THRESHOLD 256
-
-/* Compare two buffers, returning the number of pixels that are
- * different and the maximum difference of any single color channel in
- * result_ret.
- *
- * This function should be rewritten to compare all formats supported by
- * cairo_format_t instead of taking a mask as a parameter.
- */
-static void
-buffer_diff_core (const unsigned char *_buf_a, int stride_a,
- const unsigned char *_buf_b, int stride_b,
- unsigned char *_buf_diff, int stride_diff,
- int width,
- int height,
- uint32_t mask,
- buffer_diff_result_t *result_ret)
-{
- const uint32_t *buf_a = (const uint32_t*) _buf_a;
- const uint32_t *buf_b = (const uint32_t*) _buf_b;
- uint32_t *buf_diff = (uint32_t*) _buf_diff;
- int x, y;
- buffer_diff_result_t result = {0, 0};
-
- stride_a /= sizeof (uint32_t);
- stride_b /= sizeof (uint32_t);
- stride_diff /= sizeof (uint32_t);
- for (y = 0; y < height; y++) {
- const uint32_t *row_a = buf_a + y * stride_a;
- const uint32_t *row_b = buf_b + y * stride_b;
- uint32_t *row = buf_diff + y * stride_diff;
-
- for (x = 0; x < width; x++) {
- /* check if the pixels are the same */
- if ((row_a[x] & mask) != (row_b[x] & mask)) {
- int channel;
- uint32_t diff_pixel = 0;
-
- /* calculate a difference value for all 4 channels */
- for (channel = 0; channel < 4; channel++) {
- int value_a = (row_a[x] >> (channel*8)) & 0xff;
- int value_b = (row_b[x] >> (channel*8)) & 0xff;
- unsigned int diff;
- diff = abs (value_a - value_b);
- if (diff > result.max_diff)
- result.max_diff = diff;
- diff *= 4; /* emphasize */
- if (diff)
- diff += 128; /* make sure it's visible */
- if (diff > 255)
- diff = 255;
- diff_pixel |= diff << (channel*8);
- }
-
- result.pixels_changed++;
- if ((diff_pixel & 0x00ffffff) == 0) {
- /* alpha only difference, convert to luminance */
- uint8_t alpha = diff_pixel >> 24;
- diff_pixel = alpha * 0x010101;
- }
- row[x] = diff_pixel;
- } else {
- row[x] = 0;
- }
- row[x] |= 0xff000000; /* Set ALPHA to 100% (opaque) */
- }
- }
-
- *result_ret = result;
-}
-
-/* Compares two image surfaces
- *
- * Provides number of pixels changed and maximum single-channel
- * difference in result.
- *
- * Also fills in a "diff" surface intended to visually show where the
- * images differ.
- */
-static void
-compare_surfaces (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)
-{
- /* These default values were taken straight from the
- * perceptualdiff program. We'll probably want to tune these as
- * necessary. */
- double gamma = 2.2;
- double luminance = 100.0;
- double field_of_view = 45.0;
- float pixels_changed_percentage = 0.05;
- int discernible_pixels_changed;
- int pixels_tolerance;
- int width, height;
-
- /* First, we run cairo's old buffer_diff algorithm which looks for
- * pixel-perfect images, (we do this first since the test suite
- * runs about 3x slower if we run pdiff_compare first).
- */
- buffer_diff_core (cairo_image_surface_get_data (surface_a),
- cairo_image_surface_get_stride (surface_a),
- cairo_image_surface_get_data (surface_b),
- cairo_image_surface_get_stride (surface_b),
- cairo_image_surface_get_data (surface_diff),
- cairo_image_surface_get_stride (surface_diff),
- cairo_image_surface_get_width (surface_a),
- cairo_image_surface_get_height (surface_a),
- cairo_surface_get_content (surface_a) & CAIRO_CONTENT_ALPHA ? 0xffffffff : 0x00ffffff,
- result);
- if (result->pixels_changed == 0)
- return;
-
- cairo_test_log (ctx,
- "%d pixels differ (with maximum difference of %d) from reference image\n",
- result->pixels_changed, result->max_diff);
-
- /* Then, if there are any different pixels, we give the pdiff code
- * a crack at the images. If it decides that there are no visually
- * discernible differences in any pixels, then we accept this
- * result as good enough.
- *
- * Only let pdiff have a crack at the comparison if the max difference
- * is lower than a threshold, otherwise some problems could be masked.
- */
- if (result->max_diff < PERCEPTUAL_DIFF_THRESHOLD) {
- width = cairo_image_surface_get_width (surface_a);
- height = cairo_image_surface_get_height (surface_a);
- pixels_tolerance = width * height * pixels_changed_percentage;
- discernible_pixels_changed = pdiff_compare (surface_a, surface_b,
- gamma, luminance, field_of_view);
- if (discernible_pixels_changed <= pixels_tolerance) {
- result->pixels_changed = 0;
- cairo_test_log (ctx,
- "But perceptual diff finds no visually discernible difference.\n"
- "Accepting result.\n");
- }
- }
-}
-
-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)
-{
- buffer_diff_core(buf_a, stride,
- buf_b, stride,
- buf_diff, stride,
- width, height,
- 0x00ffffff,
- result);
-}
-
-static cairo_bool_t
-same_size (cairo_surface_t *a, cairo_surface_t *b)
-{
- unsigned int width_a, height_a;
- unsigned int width_b, height_b;
-
- width_a = cairo_image_surface_get_width (a);
- height_a = cairo_image_surface_get_height (a);
-
- width_b = cairo_image_surface_get_width (b);
- height_b = cairo_image_surface_get_height (b);
-
- return width_a == width_b && height_a == height_b;
-}
-
-/* Image comparison code courtesy of Richard Worth <richard@theworths.org>
- * Returns number of pixels changed, (or -1 on error).
- * Also saves a "diff" image intended to visually show where the
- * images differ.
- *
- * The return value simply indicates whether a check was successfully
- * made, (as opposed to a file-not-found condition or similar). It
- * does not indicate anything about how much the images differ. For
- * that, see result.
- *
- * One failure mode is if the two images provided do not have the same
- * dimensions. In this case, this function will return
- * CAIRO_STATUS_SURFACE_TYPE_MISMATCH (which is a bit of an abuse, but
- * oh well).
- */
-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)
-{
- if (cairo_surface_status (surface_a))
- return cairo_surface_status (surface_a);
-
- if (cairo_surface_status (surface_b))
- return cairo_surface_status (surface_b);
-
- if (cairo_surface_status (surface_diff))
- return cairo_surface_status (surface_diff);
-
- if (! same_size (surface_a, surface_b) ||
- ! same_size (surface_a, surface_diff))
- {
- cairo_test_log (ctx, "Error: Image size mismatch\n");
- return CAIRO_STATUS_SURFACE_TYPE_MISMATCH;
- }
-
- compare_surfaces (ctx, surface_a, surface_b, surface_diff, result);
-
- return CAIRO_STATUS_SUCCESS;
-}
-
-cairo_bool_t
-image_diff_is_failure (const buffer_diff_result_t *result,
- unsigned int tolerance)
-{
- return result->pixels_changed &&
- result->max_diff > tolerance;
-}
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