Adding upstream version 2.10.22.upstream/2.10.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 248 insertions, 0 deletions

diff --git a/app/operations/gimpoperationequalize.c b/app/operations/gimpoperationequalize.c
new file mode 100644
index 0000000..119be23
--- /dev/null
+++ b/app/operations/gimpoperationequalize.c
@@ -0,0 +1,248 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationequalize.c
+ * Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "core/gimphistogram.h"
+
+#include "gimpoperationequalize.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_HISTOGRAM
+};
+
+
+static void     gimp_operation_equalize_finalize     (GObject             *object);
+static void     gimp_operation_equalize_get_property (GObject             *object,
+                                                      guint                property_id,
+                                                      GValue              *value,
+                                                      GParamSpec          *pspec);
+static void     gimp_operation_equalize_set_property (GObject             *object,
+                                                      guint                property_id,
+                                                      const GValue        *value,
+                                                      GParamSpec          *pspec);
+
+static gboolean gimp_operation_equalize_process      (GeglOperation       *operation,
+                                                      void                *in_buf,
+                                                      void                *out_buf,
+                                                      glong                samples,
+                                                      const GeglRectangle *roi,
+                                                      gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationEqualize, gimp_operation_equalize,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_equalize_parent_class
+
+
+static void
+gimp_operation_equalize_class_init (GimpOperationEqualizeClass *klass)
+{
+  GObjectClass                  *object_class    = G_OBJECT_CLASS (klass);
+  GeglOperationClass            *operation_class = GEGL_OPERATION_CLASS (klass);
+  GeglOperationPointFilterClass *point_class     = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
+
+  object_class->finalize       = gimp_operation_equalize_finalize;
+  object_class->set_property   = gimp_operation_equalize_set_property;
+  object_class->get_property   = gimp_operation_equalize_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:equalize",
+                                 "categories",  "color",
+                                 "description", "GIMP Equalize operation",
+                                 NULL);
+
+  point_class->process = gimp_operation_equalize_process;
+
+  g_object_class_install_property (object_class, PROP_HISTOGRAM,
+                                   g_param_spec_object ("histogram",
+                                                        "Histogram",
+                                                        "The histogram",
+                                                        GIMP_TYPE_HISTOGRAM,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT_ONLY));
+}
+
+static void
+gimp_operation_equalize_init (GimpOperationEqualize *self)
+{
+  self->values = NULL;
+  self->n_bins = 0;
+}
+
+static void
+gimp_operation_equalize_finalize (GObject *object)
+{
+  GimpOperationEqualize *self = GIMP_OPERATION_EQUALIZE (object);
+
+  g_clear_pointer (&self->values, g_free);
+  g_clear_object (&self->histogram);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_operation_equalize_get_property (GObject    *object,
+                                      guint       property_id,
+                                      GValue     *value,
+                                      GParamSpec *pspec)
+{
+  GimpOperationEqualize *self = GIMP_OPERATION_EQUALIZE (object);
+
+  switch (property_id)
+    {
+    case PROP_HISTOGRAM:
+      g_value_set_pointer (value, self->histogram);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_operation_equalize_set_property (GObject      *object,
+                                      guint         property_id,
+                                      const GValue *value,
+                                      GParamSpec   *pspec)
+{
+  GimpOperationEqualize *self = GIMP_OPERATION_EQUALIZE (object);
+
+  switch (property_id)
+    {
+    case PROP_HISTOGRAM:
+      if (self->histogram)
+        g_object_unref (self->histogram);
+
+      self->histogram = g_value_dup_object (value);
+
+      if (self->histogram)
+        {
+          gdouble pixels;
+          gint    n_bins;
+          gint    max;
+          gint    k;
+
+          n_bins = gimp_histogram_n_bins (self->histogram);
+
+          if ((self->values != NULL) && (self->n_bins != n_bins))
+            {
+              g_free (self->values);
+              self->values = NULL;
+            }
+
+          if (self->values == NULL)
+            {
+              self->values = g_new (gdouble, 3 * n_bins);
+            }
+
+          self->n_bins = n_bins;
+
+          pixels = gimp_histogram_get_count (self->histogram,
+                                             GIMP_HISTOGRAM_VALUE, 0, n_bins - 1);
+
+          if (gimp_histogram_n_components (self->histogram) == 1 ||
+              gimp_histogram_n_components (self->histogram) == 2)
+            max = 1;
+          else
+            max = 3;
+
+          for (k = 0; k < 3; k++)
+            {
+              gdouble sum = 0;
+              gint    i;
+
+             for (i = 0; i < n_bins; i++)
+                {
+                  gdouble histi;
+
+                  histi = gimp_histogram_get_component (self->histogram, k, i);
+
+                  sum += histi;
+
+                  self->values[k * n_bins + i] = sum / pixels;
+
+                  if (max == 1)
+                    {
+                      self->values[n_bins + i] = self->values[i];
+                      self->values[2 * n_bins + i] = self->values[i];
+                    }
+                }
+           }
+        }
+      break;
+
+   default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static inline float
+gimp_operation_equalize_map (GimpOperationEqualize *self,
+                             gint                   component,
+                             gfloat                 value)
+{
+  gint index;
+  index = component * self->n_bins + \
+            (gint) (CLAMP (value * (self->n_bins - 1), 0.0, self->n_bins - 1));
+
+  return self->values[index];
+}
+
+static gboolean
+gimp_operation_equalize_process (GeglOperation       *operation,
+                                 void                *in_buf,
+                                 void                *out_buf,
+                                 glong                samples,
+                                 const GeglRectangle *roi,
+                                 gint                 level)
+{
+  GimpOperationEqualize *self = GIMP_OPERATION_EQUALIZE (operation);
+  gfloat                *src  = in_buf;
+  gfloat                *dest = out_buf;
+
+  while (samples--)
+    {
+      dest[RED]   = gimp_operation_equalize_map (self, RED,   src[RED]);
+      dest[GREEN] = gimp_operation_equalize_map (self, GREEN, src[GREEN]);
+      dest[BLUE]  = gimp_operation_equalize_map (self, BLUE,  src[BLUE]);
+      dest[ALPHA] = src[ALPHA];
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}