Adding upstream version 2.10.22.upstream/2.10.22upstream

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

1 files changed, 208 insertions, 0 deletions

diff --git a/app/operations/gimpoperationlevels.c b/app/operations/gimpoperationlevels.c
new file mode 100644
index 0000000..1bf0b06
--- /dev/null
+++ b/app/operations/gimpoperationlevels.c
@@ -0,0 +1,208 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationlevels.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 <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimplevelsconfig.h"
+#include "gimpoperationlevels.h"
+
+#include "gimp-intl.h"
+
+
+static gboolean gimp_operation_levels_process (GeglOperation       *operation,
+                                               void                *in_buf,
+                                               void                *out_buf,
+                                               glong                samples,
+                                               const GeglRectangle *roi,
+                                               gint                 level);
+
+
+G_DEFINE_TYPE (GimpOperationLevels, gimp_operation_levels,
+               GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_levels_parent_class
+
+
+static void
+gimp_operation_levels_class_init (GimpOperationLevelsClass *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->set_property   = gimp_operation_point_filter_set_property;
+  object_class->get_property   = gimp_operation_point_filter_get_property;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gimp:levels",
+                                 "categories",  "color",
+                                 "description", _("Adjust color levels"),
+                                 NULL);
+
+  point_class->process = gimp_operation_levels_process;
+
+  g_object_class_install_property (object_class,
+                                   GIMP_OPERATION_POINT_FILTER_PROP_LINEAR,
+                                   g_param_spec_boolean ("linear",
+                                                         "Linear",
+                                                         "Whether to operate on linear RGB",
+                                                         FALSE,
+                                                         G_PARAM_READWRITE));
+
+  g_object_class_install_property (object_class,
+                                   GIMP_OPERATION_POINT_FILTER_PROP_CONFIG,
+                                   g_param_spec_object ("config",
+                                                        "Config",
+                                                        "The config object",
+                                                        GIMP_TYPE_LEVELS_CONFIG,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_operation_levels_init (GimpOperationLevels *self)
+{
+}
+
+static inline gdouble
+gimp_operation_levels_map (gdouble  value,
+                           gdouble  low_input,
+                           gdouble  high_input,
+                           gboolean clamp_input,
+                           gdouble  inv_gamma,
+                           gdouble  low_output,
+                           gdouble  high_output,
+                           gboolean clamp_output)
+{
+  /*  determine input intensity  */
+  if (high_input != low_input)
+    value = (value - low_input) / (high_input - low_input);
+  else
+    value = (value - low_input);
+
+  if (clamp_input)
+    value = CLAMP (value, 0.0, 1.0);
+
+  if (inv_gamma != 1.0 && value > 0)
+    value =  pow (value, inv_gamma);
+
+  /*  determine the output intensity  */
+  if (high_output >= low_output)
+    value = value * (high_output - low_output) + low_output;
+  else if (high_output < low_output)
+    value = low_output - value * (low_output - high_output);
+
+  if (clamp_output)
+    value = CLAMP (value, 0.0, 1.0);
+
+  return value;
+}
+
+static gboolean
+gimp_operation_levels_process (GeglOperation       *operation,
+                               void                *in_buf,
+                               void                *out_buf,
+                               glong                samples,
+                               const GeglRectangle *roi,
+                               gint                 level)
+{
+  GimpOperationPointFilter *point  = GIMP_OPERATION_POINT_FILTER (operation);
+  GimpLevelsConfig         *config = GIMP_LEVELS_CONFIG (point->config);
+  gfloat                   *src    = in_buf;
+  gfloat                   *dest   = out_buf;
+  gfloat                    inv_gamma[5];
+  gint                      channel;
+
+  if (! config)
+    return FALSE;
+
+  for (channel = 0; channel < 5; channel++)
+    {
+      g_return_val_if_fail (config->gamma[channel] != 0.0, FALSE);
+
+      inv_gamma[channel] = 1.0 / config->gamma[channel];
+    }
+
+  while (samples--)
+    {
+      for (channel = 0; channel < 4; channel++)
+        {
+          gdouble value;
+
+          value = gimp_operation_levels_map (src[channel],
+                                             config->low_input[channel + 1],
+                                             config->high_input[channel + 1],
+                                             config->clamp_input,
+                                             inv_gamma[channel + 1],
+                                             config->low_output[channel + 1],
+                                             config->high_output[channel + 1],
+                                             config->clamp_output);
+
+          /* don't apply the overall curve to the alpha channel */
+          if (channel != ALPHA)
+            value = gimp_operation_levels_map (value,
+                                               config->low_input[0],
+                                               config->high_input[0],
+                                               config->clamp_input,
+                                               inv_gamma[0],
+                                               config->low_output[0],
+                                               config->high_output[0],
+                                               config->clamp_output);
+
+          dest[channel] = value;
+        }
+
+      src  += 4;
+      dest += 4;
+    }
+
+  return TRUE;
+}
+
+
+/*  public functions  */
+
+gdouble
+gimp_operation_levels_map_input (GimpLevelsConfig     *config,
+                                 GimpHistogramChannel  channel,
+                                 gdouble               value)
+{
+  g_return_val_if_fail (GIMP_IS_LEVELS_CONFIG (config), 0.0);
+
+  /*  determine input intensity  */
+  if (config->high_input[channel] != config->low_input[channel])
+    value = ((value - config->low_input[channel]) /
+             (config->high_input[channel] - config->low_input[channel]));
+  else
+    value = (value - config->low_input[channel]);
+
+  if (config->gamma[channel] != 0.0 && value > 0.0)
+    value = pow (value, 1.0 / config->gamma[channel]);
+
+  return value;
+}