[gegl] tests: add a test-case for gegl:image-compare

From: Téo Mazars <teom src gnome org>
To: commits-list gnome org
Cc:
Subject: [gegl] tests: add a test-case for gegl:image-compare
Date: Sun, 20 Oct 2013 12:07:22 +0000 (UTC)
commit 7b6da6f3adda31252b0b9eae247b4a1fe186a388
Author: Téo Mazars <teo mazars ensimag fr>
Date:   Thu Oct 17 12:17:46 2013 +0200

    tests: add a test-case for gegl:image-compare

 tests/simple/Makefile.am          |    1 +
 tests/simple/test-image-compare.c |  476 +++++++++++++++++++++++++++++++++++++
 2 files changed, 477 insertions(+), 0 deletions(-)
---
diff --git a/tests/simple/Makefile.am b/tests/simple/Makefile.am
index ee47afc..dd1820f 100644
--- a/tests/simple/Makefile.am
+++ b/tests/simple/Makefile.am
@@ -15,6 +15,7 @@ noinst_PROGRAMS =                     \
        test-format-sensing             \
        test-gegl-rectangle             \
        test-gegl-tile                  \
+       test-image-compare              \
        test-misc                       \
        test-node-properties            \
        test-opencl-colors              \
diff --git a/tests/simple/test-image-compare.c b/tests/simple/test-image-compare.c
new file mode 100644
index 0000000..0a749d9
--- /dev/null
+++ b/tests/simple/test-image-compare.c
@@ -0,0 +1,476 @@
+/* This file is a test-case for GEGL
+ *
+ * GEGL is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * GEGL 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright (C) 2013 Téo Mazars <teo mazars ensimag fr>
+ */
+
+#include "gegl.h"
+#include "gegl-utils.h"
+
+#include <string.h>
+#include <math.h>
+
+#define SUCCESS    0
+#define FAILURE    -1
+
+#define NUM_ROWS   8
+#define NUM_COLS   16
+#define NUM_PIXELS (NUM_ROWS * NUM_COLS)
+
+#define SQR(x)     ((x)*(x))
+#define EPSILON    1e-5
+
+typedef struct
+{
+  gint    wrong_pixels;
+  gdouble max_diff;
+  gdouble avg_diff_wrong;
+  gdouble avg_diff_total;
+  const guchar  *output;
+} CompareResult;
+
+static gboolean compare_images  (GeglBuffer          *output_buffer,
+                                 const CompareResult *expected_result);
+static gboolean compare_values  (GeglNode            *comparison,
+                                 const CompareResult *expected_result);
+static gboolean test_comparison (const gfloat        *reference,
+                                 const gfloat        *test_case,
+                                 const CompareResult *expected_result);
+
+const guchar alpha_ref[NUM_PIXELS * 3] =
+  {232, 232, 232, 132, 132, 132, 116, 116, 116, 115, 115, 115, 117, 117,
+   117, 119, 119, 119, 120, 120, 120, 122, 122, 122, 123, 123, 123, 124,
+   124, 124, 125, 125, 125, 126, 126, 126, 126, 126, 126, 127, 127, 127,
+   128, 128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129, 129,
+   129, 129, 129, 129, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130,
+   130, 130, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131,
+   131, 131, 131, 131, 131, 131, 131, 131, 131, 132, 132, 132, 132, 132,
+   132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132,
+   132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 62, 2, 0, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 62, 255, 0, 134, 134, 134,
+   134, 134, 134, 134, 134, 134};
+
+const guchar rgba_r_ref[NUM_PIXELS * 3] =
+  {232, 232, 232, 132, 132, 132, 116, 116, 116, 115, 115, 115, 117, 117,
+   117, 119, 119, 119, 120, 120, 120, 122, 122, 122, 123, 123, 123, 124,
+   124, 124, 125, 125, 125, 126, 126, 126, 126, 126, 126, 127, 127, 127,
+   128, 128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129, 129,
+   129, 129, 129, 129, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130,
+   130, 130, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131,
+   131, 131, 131, 131, 131, 131, 131, 131, 131, 132, 132, 132, 132, 132,
+   132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132,
+   132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 62, 2, 0,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   62, 255, 0, 134, 134, 134};
+
+const guchar rgba_g_ref[NUM_PIXELS * 3] =
+  {232, 232, 232, 132, 132, 132, 116, 116, 116, 115, 115, 115, 117, 117,
+   117, 119, 119, 119, 120, 120, 120, 122, 122, 122, 123, 123, 123, 124,
+   124, 124, 125, 125, 125, 126, 126, 126, 126, 126, 126, 127, 127, 127,
+   128, 128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129, 129,
+   129, 129, 129, 129, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130,
+   130, 130, 131, 131, 131, 63, 27, 0, 131, 131, 131, 131, 131, 131,
+   131, 131, 131, 131, 131, 131, 131, 131, 131, 132, 132, 132, 132, 132,
+   132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 62, 255, 0, 132, 132,
+   132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134};
+
+const guchar rgba_b_ref[NUM_PIXELS * 3] =
+  {232, 232, 232, 132, 132, 132, 116, 116, 116, 115, 115, 115, 117, 117,
+   117, 119, 119, 119, 120, 120, 120, 122, 122, 122, 123, 123, 123, 124,
+   124, 124, 125, 125, 125, 126, 126, 126, 126, 126, 126, 127, 127, 127,
+   128, 128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129, 129,
+   129, 129, 129, 129, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130,
+   130, 130, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131,
+   131, 131, 131, 131, 131, 131, 131, 131, 131, 132, 132, 132, 132, 132,
+   132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132,
+   132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 62, 4, 0, 133,
+   133, 133, 133, 133, 133, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 62, 255, 0,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134};
+
+const guchar ok_ref[NUM_PIXELS * 3] =
+  {232, 232, 232, 132, 132, 132, 116, 116, 116, 115, 115, 115, 117, 117,
+   117, 119, 119, 119, 120, 120, 120, 122, 122, 122, 123, 123, 123, 124,
+   124, 124, 125, 125, 125, 126, 126, 126, 126, 126, 126, 127, 127, 127,
+   128, 128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129, 129,
+   129, 129, 129, 129, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130,
+   130, 130, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131,
+   131, 131, 131, 131, 131, 131, 131, 131, 131, 132, 132, 132, 132, 132,
+   132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132,
+   132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 132,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133, 133,
+   133, 133, 133, 133, 133, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
+   134, 134, 134, 134, 134, 134};
+
+const CompareResult
+alpha_case =
+  {
+    2,           /* wrong pixels   */
+    88.406395,   /* max diff       */
+    44.703197,   /* avg_diff_wrong */
+    0.698487,    /* avg_diff_total */
+    alpha_ref    /* ref image      */
+  };
+
+const CompareResult
+rgba_r_case =
+  {
+    2,
+    108.086754,
+    54.521946,
+    0.851905,
+    rgba_r_ref
+  };
+
+const CompareResult
+rgba_g_case =
+  {
+    2,
+    1.945577,
+    1.076242,
+    0.016816,
+    rgba_g_ref
+  };
+
+const CompareResult
+rgba_b_case =
+  {
+    2,
+    33.873798,
+    17.264227,
+    0.269754,
+    rgba_b_ref
+  };
+
+const CompareResult
+ok_case =
+  {
+    0,
+    0.0,
+    0.0,
+    0.0,
+    ok_ref
+  };
+
+static gboolean
+compare_images (GeglBuffer          *output_buffer,
+                const CompareResult *expected_result)
+{
+  const Babl   *output_format = babl_format ("R'G'B' u8");
+  GeglRectangle extent;
+  guchar        output [NUM_PIXELS * 3];
+
+  extent = *GEGL_RECTANGLE (0, 0, NUM_COLS, NUM_ROWS);
+
+  if (! gegl_rectangle_equal (gegl_buffer_get_extent (output_buffer), &extent))
+    {
+      g_printerr ("Unexpected extent. ");
+      return FAILURE;
+    }
+
+  gegl_buffer_get (output_buffer, &extent, 1.0, output_format,
+                   output, GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+  if (memcmp (output, expected_result->output, NUM_PIXELS * 3) != 0)
+    {
+      g_printerr ("Output image differs. ");
+      return FAILURE;
+    }
+
+  return SUCCESS;
+}
+
+static gboolean
+compare_values (GeglNode            *comparison,
+                const CompareResult *expected_result)
+{
+  CompareResult actual_result;
+  gint          test_result;
+  /* Fetch all datas */
+  gegl_node_get (comparison,
+                 "max_diff",       &actual_result.max_diff,
+                 "avg_diff_wrong", &actual_result.avg_diff_wrong,
+                 "avg_diff_total", &actual_result.avg_diff_total,
+                 "wrong_pixels",   &actual_result.wrong_pixels,
+                 NULL);
+
+  /* Check each value */
+  test_result = SUCCESS;
+
+  if (fabs (actual_result.max_diff - expected_result->max_diff)
+      > EPSILON)
+    {
+      g_printerr ("The max_diff property differs: %f instead of %f. ",
+                  (gfloat) actual_result.max_diff,
+                  (gfloat) expected_result->max_diff);
+      test_result = FAILURE;
+    }
+  if (fabs (actual_result.avg_diff_wrong - expected_result->avg_diff_wrong)
+      > EPSILON)
+    {
+      g_printerr ("The avg_diff_wrong property differs: %f instead of %f. ",
+                  (gfloat) actual_result.avg_diff_wrong,
+                  (gfloat) expected_result->avg_diff_wrong);
+      test_result = FAILURE;
+    }
+  if (fabs (actual_result.avg_diff_total - expected_result->avg_diff_total)
+      > EPSILON)
+    {
+      g_printerr ("The avg_diff_total property differs: %f instead of %f. ",
+                  (gfloat) actual_result.avg_diff_total,
+                  (gfloat) expected_result->avg_diff_total);
+      test_result = FAILURE;
+    }
+  if (actual_result.wrong_pixels != expected_result->wrong_pixels)
+    {
+      g_printerr ("The wrong_pixels property differs: %d instead of %d. ",
+                  actual_result.wrong_pixels,
+                  expected_result->wrong_pixels);
+      test_result = FAILURE;
+    }
+
+  return test_result;
+}
+
+static gboolean
+test_comparison (const gfloat        *reference,
+                 const gfloat        *test_case,
+                 const CompareResult *expected_result)
+{
+  GeglBuffer    *src_ref_buffer;
+  GeglBuffer    *src_aux_buffer;
+  GeglBuffer    *sink_buffer = NULL;
+  GeglRectangle  extent;
+  const Babl    *input_format = babl_format ("R'G'B'A float");
+  GeglNode      *graph, *source_ref, *source_aux, *comparison, *sink;
+  gint           diff_result, values_result;
+
+  /* Set up all buffers */
+  extent = *GEGL_RECTANGLE (0, 0, NUM_COLS, NUM_ROWS);
+
+  src_ref_buffer = gegl_buffer_new (&extent, input_format);
+  src_aux_buffer = gegl_buffer_new (&extent, input_format);
+
+  gegl_buffer_set (src_ref_buffer, &extent, 1, input_format,
+                   reference, GEGL_AUTO_ROWSTRIDE);
+  gegl_buffer_set (src_aux_buffer, &extent, 1, input_format,
+                   test_case, GEGL_AUTO_ROWSTRIDE);
+
+  /* Build the test graph */
+  graph = gegl_node_new ();
+  source_ref = gegl_node_new_child (graph,
+                                    "operation", "gegl:buffer-source",
+                                    "buffer", src_ref_buffer,
+                                    NULL);
+  source_aux = gegl_node_new_child (graph,
+                                    "operation", "gegl:buffer-source",
+                                    "buffer", src_aux_buffer,
+                                    NULL);
+  comparison = gegl_node_new_child (graph,
+                                    "operation", "gegl:image-compare",
+                                    NULL);
+  sink       = gegl_node_new_child (graph,
+                                    "operation", "gegl:buffer-sink",
+                                    "buffer", &sink_buffer,
+                                    NULL);
+
+  gegl_node_link_many (source_ref, comparison, sink, NULL);
+  gegl_node_connect_to (source_aux, "output",  comparison, "aux");
+
+  gegl_node_process (sink);
+
+  /* Compare with reference */
+  values_result = compare_values (comparison, expected_result);
+
+  /* Compare output images */
+  diff_result = compare_images (sink_buffer, expected_result);
+
+  /* We are done, clean and quit */
+  g_object_unref (graph);
+  g_object_unref (src_aux_buffer);
+  g_object_unref (src_ref_buffer);
+  g_object_unref (sink_buffer);
+
+  if (diff_result != SUCCESS || values_result != SUCCESS)
+    return FAILURE;
+
+  return SUCCESS;
+}
+
+
+int main (int   argc,
+          char *argv[])
+{
+  gfloat reference    [NUM_PIXELS * 4];
+  gfloat test_alpha   [NUM_PIXELS * 4];
+  gfloat test_rgba_r  [NUM_PIXELS * 4];
+  gfloat test_rgba_g  [NUM_PIXELS * 4];
+  gfloat test_rgba_b  [NUM_PIXELS * 4];
+  gfloat test_ok      [NUM_PIXELS * 4];
+  gint   result;
+  gint   i;
+
+  gegl_init (&argc, &argv);
+
+  /* Init an arbitrary image */
+  for (i = 0; i < NUM_PIXELS; i++)
+    {
+      gfloat coef = i / (gfloat) (i + 1.0);
+      reference [i * 4 + 0] = CLAMP (coef,             0.0, 1.0);
+      reference [i * 4 + 1] = CLAMP (1.0 - coef,       0.0, 1.0);
+      reference [i * 4 + 2] = CLAMP (SQR (1.0 - coef), 0.0, 1.0);
+      reference [i * 4 + 3] = CLAMP (SQR (coef),       0.0, 1.0);
+    }
+
+  memcpy (test_alpha,  reference, NUM_PIXELS * 4 * sizeof (gfloat));
+  memcpy (test_rgba_r, reference, NUM_PIXELS * 4 * sizeof (gfloat));
+  memcpy (test_rgba_g, reference, NUM_PIXELS * 4 * sizeof (gfloat));
+  memcpy (test_rgba_b, reference, NUM_PIXELS * 4 * sizeof (gfloat));
+  memcpy (test_ok   ,  reference, NUM_PIXELS * 4 * sizeof (gfloat));
+
+  /* Images are 8x16 RGBA, alters some pixels.
+   * Try to trick image-compare's implementation
+   * by setting the lowest difference first
+   */
+  test_rgba_r [4 * (2 * NUM_COLS + 9)  + 0] -= -0.01;
+  test_rgba_r [4 * (7 * NUM_COLS + 14) + 0] = 0.1;
+
+  test_rgba_g [4 * (1 * NUM_COLS + 9) + 1] += 0.01;
+  test_rgba_g [4 * (2 * NUM_COLS + 4) + 1] = 0.1;
+
+  test_rgba_b [4 * (4 * NUM_COLS + 0) + 2] += 0.01;
+  test_rgba_b [4 * (5 * NUM_COLS + 3) + 2] = 0.3;
+
+  test_alpha [4 * (3 * NUM_COLS + 6)  + 3] -= 0.01;
+  test_alpha [4 * (7 * NUM_COLS + 12) + 3] = 0.1;
+
+  /* Perform all 5 tests cases */
+  result  = SUCCESS;
+
+  if (test_comparison (reference, test_alpha, &alpha_case))
+    {
+      g_printerr ("-> Comparison failed for the alpha channel case\n");
+      result = FAILURE;
+    }
+  if (test_comparison (reference, test_rgba_r, &rgba_r_case))
+    {
+      g_printerr ("-> Comparison failed for the red channel case\n");
+      result = FAILURE;
+    }
+  if (test_comparison (reference, test_rgba_g, &rgba_g_case))
+    {
+      g_printerr ("-> Comparison failed for the green channel case\n");
+      result = FAILURE;
+    }
+  if (test_comparison (reference, test_rgba_b, &rgba_b_case))
+    {
+      g_printerr ("-> Comparison failed for the blue channel case\n");
+      result = FAILURE;
+    }
+  if (test_comparison (reference, test_ok, &ok_case))
+    {
+      g_printerr ("-> Comparison failed for the reference case\n");
+      result = FAILURE;
+    }
+
+  gegl_exit ();
+
+  return result;
+}
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