summaryrefslogtreecommitdiff
path: root/test/pdiff/perceptualdiff.c
diff options
context:
space:
mode:
Diffstat (limited to 'test/pdiff/perceptualdiff.c')
-rw-r--r--test/pdiff/perceptualdiff.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/test/pdiff/perceptualdiff.c b/test/pdiff/perceptualdiff.c
new file mode 100644
index 000000000..5850dc916
--- /dev/null
+++ b/test/pdiff/perceptualdiff.c
@@ -0,0 +1,101 @@
+/*
+ PerceptualDiff - a program that compares two images using a perceptual metric
+ based on the paper :
+ A perceptual metric for production testing. Journal of graphics tools, 9(4):33-40, 2004, Hector Yee
+ Copyright (C) 2006 Yangli Hector Yee
+
+ This program is free software; you can redistribute it and/or modify it under the terms of the
+ GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
+ or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with this program;
+ if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+*/
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <math.h>
+#include "lpyramid.h"
+#include "args.h"
+#include "pdiff.h"
+
+static bool Yee_Compare(args_t *args)
+{
+ unsigned int width_a, height_a, stride_a;
+ unsigned char *data_a, *row_a;
+ uint32_t *pixel_a;
+ unsigned int width_b, height_b, stride_b;
+ unsigned char *data_b, *row_b;
+ uint32_t *pixel_b;
+ unsigned int x, y, pixels_failed;
+ bool identical = true;
+
+ width_a = cairo_image_surface_get_width (args->surface_a);
+ height_a = cairo_image_surface_get_height (args->surface_a);
+ stride_a = cairo_image_surface_get_stride (args->surface_a);
+ data_a = cairo_image_surface_get_data (args->surface_a);
+
+ width_b = cairo_image_surface_get_width (args->surface_b);
+ height_b = cairo_image_surface_get_height (args->surface_b);
+ stride_b = cairo_image_surface_get_stride (args->surface_b);
+ data_b = cairo_image_surface_get_data (args->surface_b);
+
+ if ((width_a != width_b) || (height_a != height_b)) {
+ printf ("FAIL: Image dimensions do not match\n");
+ return false;
+ }
+
+ identical = true;
+
+ for (y = 0; y < height_a; y++) {
+ row_a = data_a + y * stride_a;
+ row_b = data_b + y * stride_b;
+ pixel_a = (uint32_t *) row_a;
+ pixel_b = (uint32_t *) row_b;
+ for (x = 0; x < width_a; x++) {
+ if (*pixel_a != *pixel_b) {
+ identical = false;
+ }
+ pixel_a++;
+ pixel_b++;
+ }
+ }
+ if (identical) {
+ printf ("PASS: Images are binary identical\n");
+ return true;
+ }
+
+ pixels_failed = pdiff_compare (args->surface_a, args->surface_b,
+ args->Gamma, args->Luminance,
+ args->FieldOfView);
+
+ if (pixels_failed < args->ThresholdPixels) {
+ printf ("PASS: Images are perceptually indistinguishable\n");
+ return true;
+ }
+
+ printf("FAIL: Images are visibly different\n"
+ "%d pixels are different\n", pixels_failed);
+
+ return false;
+}
+
+int main(int argc, char **argv)
+{
+ args_t args;
+
+ args_init (&args);
+
+ if (!args_parse (&args, argc, argv)) {
+ return -1;
+ } else {
+ if (args.Verbose)
+ args_print (&args);
+ }
+ return ! Yee_Compare(&args);
+}