[gegl: 30/55] Noise-Hurl Operation

[Michael Murà <mmure src gnome org>]

commit b01170835d80e83af9773a1b246550461424960d
Author: Maxime Nicco <maxime nicco gmail fr>
Date:   Tue Aug 7 12:20:52 2012 +0200

    Noise-Hurl Operation
    
    First version, wait for gegl_chant_seed propertie

 operations/common/noise-hurl.c |  137 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 137 insertions(+), 0 deletions(-)
---
diff --git a/operations/common/noise-hurl.c b/operations/common/noise-hurl.c
new file mode 100644
index 0000000..5442130
--- /dev/null
+++ b/operations/common/noise-hurl.c
@@ -0,0 +1,137 @@
+/* This file is an image processing operation 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 1997 Miles O'Neal <meo rru com>  http://www.rru.com/~meo/
+ * Copyright 2012 Maxime Nicco <maxime nicco gmail com>
+ */
+
+/*
+ *  HURL Operation
+ *      We just assign a random value at the current pixel
+ */
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+#ifdef GEGL_CHANT_PROPERTIES
+
+//gegl_chant_int (random_seed, _("Random seed"),   1, 8, 2, _("Random seed"))
+
+gegl_chant_double (pct_random, _("Randomization (%)"),   0.0, 100.0, 3.0, _("Radomization"))
+
+gegl_chant_int (repeat, _("Repeat"),   1, 100, 1, _("Repeat"))
+
+
+#else
+
+#define GEGL_CHANT_TYPE_POINT_FILTER
+#define GEGL_CHANT_C_FILE       "noise-hurl.c"
+
+#include "gegl-chant.h"
+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+
+static void prepare (GeglOperation *operation)
+{
+  gegl_operation_set_format (operation, "input" , babl_format ("RGBA float"));
+  gegl_operation_set_format (operation, "output", babl_format ("RGBA float"));
+}
+
+static gboolean
+process (GeglOperation       *operation,
+         void                *in_buf,
+         void                *out_buf,
+         glong                n_pixels,
+         const GeglRectangle *roi,
+         gint                 level)
+{
+  GeglChantO *o  = GEGL_CHANT_PROPERTIES (operation);
+
+  gint i, cnt;
+
+  GRand    *gr;
+
+  gfloat   * GEGL_ALIGNED in_pixel;
+  gfloat   * GEGL_ALIGNED out_pixel;
+
+  gfloat red, green, blue, alpha;
+  gfloat *out_pix;
+
+  in_pixel      = in_buf;
+  out_pixel     = out_buf;
+
+  gr = g_rand_new ();
+
+  out_pix = out_pixel;
+
+  for (i = 0; i < n_pixels*4; i++)
+  {
+    *out_pix = *in_pixel;
+    out_pix += 1;
+    in_pixel += 1;
+  }
+
+
+  for (cnt = 1; cnt <= o->repeat; cnt++)
+  {
+    out_pix = out_pixel;
+
+    for (i = 0; i < n_pixels; i++)
+    {
+      red   = out_pix[0];
+      green = out_pix[1];
+      blue  = out_pix[2];
+      alpha = out_pix[3];
+
+      if (g_rand_double_range (gr, 0.0, 100.0) <= o->pct_random)
+      {
+        red   = g_rand_double_range (gr, 0.0, 1.0);
+        green = g_rand_double_range (gr, 0.0, 1.0);
+        blue  = g_rand_double_range (gr, 0.0, 1.0);
+      }
+
+      out_pix[0] = red;
+      out_pix[1] = green;
+      out_pix[2] = blue;
+      out_pix[3] = alpha;
+
+      out_pix += 4;
+    }
+ }
+  return TRUE;
+
+}
+
+static void
+gegl_chant_class_init (GeglChantClass *klass)
+{
+  GeglOperationClass            *operation_class;
+  GeglOperationPointFilterClass *point_filter_class;
+
+  operation_class    = GEGL_OPERATION_CLASS (klass);
+  point_filter_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  operation_class->prepare = prepare;
+  point_filter_class->process = process;
+
+  gegl_operation_class_set_keys (operation_class,
+      "name",       "gegl:noise-Hurl",
+      "categories", "noise",
+      "description", _("Completely randomize a fraction of pixels"),
+      NULL);
+}
+
+#endif