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Use pdiff only if the pixel difference is less than a limit

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Vladimir Vukicevic 2008-02-25 21:06:35 -05:00 • committed by Vladimir Vukicevic
parent 1dfb1bd45f
commit 3fcd0be522
1 changed files with 17 additions and 7 deletions
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24
test/buffer-diff.c
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@ -42,6 +42,10 @@
#include "buffer-diff.h"
#include "xmalloc.h"
/* Don't allow any differences greater than this value, even if pdiff
* claims that the images are identical */
#define PERCEPTUAL_DIFF_THRESHOLD 25
static void
xunlink (const char *pathname)
{
@ -152,13 +156,19 @@ compare_surfaces (cairo_surface_t *surface_a,
/* 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. */
discernible_pixels_changed = pdiff_compare (surface_a, surface_b,
gamma, luminance, field_of_view);
if (discernible_pixels_changed == 0) {
result->pixels_changed = 0;
cairo_test_log ("But perceptual diff finds no visually discernible difference.\n"
"Accepting result.\n");
* 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) {
discernible_pixels_changed = pdiff_compare (surface_a, surface_b,
gamma, luminance, field_of_view);
if (discernible_pixels_changed == 0) {
result->pixels_changed = 0;
cairo_test_log ("But perceptual diff finds no visually discernible difference.\n"
"Accepting result.\n");
}
}
}