1 files changed, 101 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/pdiff/perceptualdiff.c b/libs/cairo-1.16.0/test/pdiff/perceptualdiff.c
new file mode 100644
index 0000000..5850dc9
--- /dev/null
+++ b/libs/cairo-1.16.0/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);
+}