[gegl/wip/rishi/insta: 7/8] Add Instagram Hefe

[Debarshi Ray <debarshir src gnome org>]

commit 23848decf9734709ad252168ad56b01de86c7961
Author: Debarshi Ray <debarshir gnome org>
Date:   Tue Feb 9 12:06:26 2016 +0100

    Add Instagram Hefe
    
    The filter is implemented by a hidden meta-operation called
    gegl:insta-hefe, which in turn uses gegl:insta-hefe-curve,
    gegl:insta-hefe-vignette and svg:multiply.
    
    Based on an analysis by Corey Hoard <corey coreyhoard com>:
    http://www.coreyhoard.com/mirror/CH_Rev_Eng_Hefe_wDataset.zip
    
    https://bugzilla.gnome.org/show_bug.cgi?id=743681

 operations/workshop/Makefile.am           |    1 +
 operations/workshop/insta-hefe-curve.c    |  115 +++++++++++++++++++++++++++++
 operations/workshop/insta-hefe-vignette.c |   72 ++++++++++++++++++
 3 files changed, 188 insertions(+), 0 deletions(-)
---
diff --git a/operations/workshop/Makefile.am b/operations/workshop/Makefile.am
index 84f7c67..8f83715 100644
--- a/operations/workshop/Makefile.am
+++ b/operations/workshop/Makefile.am
@@ -21,6 +21,7 @@ op_LTLIBRARIES =    \
        ink-simulator.la \
        insta-curve.la \
        insta-filter.la \
+       insta-hefe-curve.la \
        kuwahara.la \
        mandelbrot.la \
        median-blur.la \
diff --git a/operations/workshop/insta-hefe-curve.c b/operations/workshop/insta-hefe-curve.c
new file mode 100644
index 0000000..e7ca086
--- /dev/null
+++ b/operations/workshop/insta-hefe-curve.c
@@ -0,0 +1,115 @@
+/* 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 2016 Red Hat, Inc.
+ */
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+#ifdef GEGL_PROPERTIES
+
+#else
+
+#define GEGL_OP_POINT_FILTER
+#define GEGL_OP_C_FILE "insta-hefe-curve.c"
+
+#include "gegl-op.h"
+
+static void
+prepare (GeglOperation *operation)
+{
+  const Babl *format;
+
+  format = babl_format ("R'G'B'A float");
+  gegl_operation_set_format (operation, "input", format);
+  gegl_operation_set_format (operation, "output", format);
+}
+
+static gboolean
+process (GeglOperation       *operation,
+         void                *in_buf,
+         void                *out_buf,
+         glong                n_pixels,
+         const GeglRectangle *roi,
+         gint                 level)
+{
+  gfloat *in = in_buf;
+  gfloat *out = out_buf;
+  glong i;
+
+  for (i = 0; i < n_pixels; i++)
+    {
+      const float b = in[2];
+      const float b2 = b * b;
+      const float b3 = b2 * b;
+      const float g = in[1];
+      const float g2 = g * g;
+      const float g3 = g2 * g;
+      const float r = in[0];
+      const float r2 = r * r;
+      const float r3 = r2 * r;
+
+      out[0] = -13.47f * r3 * r3
+        + 41.23f * r3 * r2
+        - 45.04f * r2 * r2
+        + 19.17 * r3
+        - 1.492f * r2
+        + 0.5954f * r;
+
+      out[1] = -12.28f * g3 * g3
+        + 41.09f * g3 * g2
+        - 50.52f * g2 * g2
+        + 26.03 * g3
+        - 3.916f * g2
+        + 0.58f * g;
+
+      out[2] = -1.066f * b3 * b3
+        + 9.679f * b3 * b2
+        - 19.09f * b2 * b2
+        + 12.92 * b3
+        - 1.835f * b2
+        + 0.3487f * b;
+
+      out[3] = in[3];
+
+      in += 4;
+      out += 4;
+    }
+
+  return TRUE;
+}
+
+static void
+gegl_op_class_init (GeglOpClass *klass)
+{
+  GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_filter_class =
+    GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  operation_class->prepare = prepare;
+  operation_class->opencl_support = FALSE;
+
+  point_filter_class->process = process;
+
+  gegl_operation_class_set_keys (operation_class,
+    "name",        "gegl:insta-hefe-curve",
+    "title",       _("Insta Hefe Curve"),
+    "categories",  "hidden",
+    "description", _("Apply the Hefe curve to an image"),
+    NULL);
+}
+
+#endif
diff --git a/operations/workshop/insta-hefe-vignette.c b/operations/workshop/insta-hefe-vignette.c
new file mode 100644
index 0000000..938cf99
--- /dev/null
+++ b/operations/workshop/insta-hefe-vignette.c
@@ -0,0 +1,72 @@
+/* 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 2016 Red Hat, Inc.
+ */
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+#ifdef GEGL_PROPERTIES
+
+#else
+
+#define GEGL_OP_POINT_RENDER
+#define GEGL_OP_C_FILE "insta-hefe-vignette.c"
+
+#include "gegl-op.h"
+
+static void
+prepare (GeglOperation *operation)
+{
+  const Babl *format;
+
+  format = babl_format ("R'G'B'A float");
+  gegl_operation_set_format (operation, "input", format);
+  gegl_operation_set_format (operation, "output", format);
+}
+
+static gboolean
+process (GeglOperation       *operation,
+         void                *out_buf,
+         glong                n_pixels,
+         const GeglRectangle *roi,
+         gint                 level)
+{
+  return TRUE;
+}
+
+static void
+gegl_op_class_init (GeglOpClass *klass)
+{
+  GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointRenderClass *point_render_class =
+    GEGL_OPERATION_POINT_RENDER_CLASS (klass);
+
+  operation_class->get_bounding_box = get_bounding_box;
+  operation_class->prepare = prepare;
+  operation_class->opencl_support = FALSE;
+
+  point_render_class->process = process;
+
+  gegl_operation_class_set_keys (operation_class,
+    "name",        "gegl:insta-hefe-vignette",
+    "title",       _("Insta Hefe Vignette"),
+    "categories",  "hidden",
+    "description", _("Apply the Hefe vignette to an image"),
+    NULL);
+}
+
+#endif