[gimp/metadata-browser] app: add GimpApplicator which wraps a graph that applies a buffer to a drawable

[Roman Joost <romanofski src gnome org>]

commit fe7c0f40a19527735440a11145b037ee8f9a7c00
Author: Michael Natterer <mitch gimp org>
Date:   Sat May 26 12:36:00 2012 +0200

    app: add GimpApplicator which wraps a graph that applies a buffer to a drawable
    
    and use it in GimpPaintCore, instead of calling
    gimp_drawable_apply_buffer() which sets up a new graph for each
    call. Makes painting speed bearable again.

 app/gegl/gimpapplicator.c |  252 +++++++++++++++++++++++++++++++++++++++++++++
 app/gegl/gimpapplicator.h |   70 +++++++++++++
 2 files changed, 322 insertions(+), 0 deletions(-)
---
diff --git a/app/gegl/gimpapplicator.c b/app/gegl/gimpapplicator.c
new file mode 100644
index 0000000..bb23ca6
--- /dev/null
+++ b/app/gegl/gimpapplicator.c
@@ -0,0 +1,252 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+
+#include "gimp-gegl-types.h"
+
+#include "gimp-gegl-nodes.h"
+#include "gimpapplicator.h"
+
+
+static void   gimp_applicator_finalize     (GObject      *object);
+static void   gimp_applicator_set_property (GObject      *object,
+                                            guint         property_id,
+                                            const GValue *value,
+                                            GParamSpec   *pspec);
+static void   gimp_applicator_get_property (GObject      *object,
+                                            guint         property_id,
+                                            GValue       *value,
+                                            GParamSpec   *pspec);
+
+
+G_DEFINE_TYPE (GimpApplicator, gimp_applicator, G_TYPE_OBJECT)
+
+#define parent_class gimp_applicator_parent_class
+
+
+static void
+gimp_applicator_class_init (GimpApplicatorClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize     = gimp_applicator_finalize;
+  object_class->set_property = gimp_applicator_set_property;
+  object_class->get_property = gimp_applicator_get_property;
+}
+
+static void
+gimp_applicator_init (GimpApplicator *core)
+{
+}
+
+static void
+gimp_applicator_finalize (GObject *object)
+{
+  GimpApplicator *applicator = GIMP_APPLICATOR (object);
+
+  if (applicator->node)
+    {
+      g_object_unref (applicator->node);
+      applicator->node = NULL;
+    }
+
+  if (applicator->processor)
+    {
+      g_object_unref (applicator->processor);
+      applicator->processor = NULL;
+    }
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_applicator_set_property (GObject      *object,
+                              guint         property_id,
+                              const GValue *value,
+                              GParamSpec   *pspec)
+{
+  switch (property_id)
+    {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_applicator_get_property (GObject    *object,
+                              guint       property_id,
+                              GValue     *value,
+                              GParamSpec *pspec)
+{
+  switch (property_id)
+    {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+GimpApplicator *
+gimp_applicator_new (GeglBuffer        *dest_buffer,
+                     GimpComponentMask  affect,
+                     GeglBuffer        *mask_buffer,
+                     gint               mask_offset_x,
+                     gint               mask_offset_y)
+{
+  GimpApplicator *applicator;
+
+  g_return_val_if_fail (GEGL_IS_BUFFER (dest_buffer), NULL);
+  g_return_val_if_fail (mask_buffer == NULL || GEGL_IS_BUFFER (mask_buffer),
+                        NULL);
+
+  applicator = g_object_new (GIMP_TYPE_APPLICATOR, NULL);
+
+  applicator->node = gegl_node_new ();
+
+  applicator->mode_node = gegl_node_new_child (applicator->node,
+                                               "operation", "gimp:normal-mode",
+                                               NULL);
+
+  applicator->src_node =
+    gegl_node_new_child (applicator->node,
+                         "operation", "gegl:buffer-source",
+                         NULL);
+
+  gegl_node_connect_to (applicator->src_node,  "output",
+                        applicator->mode_node, "input");
+
+  applicator->apply_src_node =
+    gegl_node_new_child (applicator->node,
+                         "operation", "gegl:buffer-source",
+                         NULL);
+
+  applicator->apply_offset_node =
+    gegl_node_new_child (applicator->node,
+                         "operation", "gegl:translate",
+                         NULL);
+
+  gegl_node_connect_to (applicator->apply_src_node,    "output",
+                        applicator->apply_offset_node, "input");
+  gegl_node_connect_to (applicator->apply_offset_node, "output",
+                        applicator->mode_node,         "aux");
+
+  if (mask_buffer)
+    {
+      GeglNode *mask_src;
+
+      mask_src = gegl_node_new_child (applicator->node,
+                                      "operation", "gegl:buffer-source",
+                                      "buffer",    mask_buffer,
+                                      NULL);
+
+      if (mask_offset_x != 0 || mask_offset_y != 0)
+        {
+          GeglNode *offset;
+
+          offset = gegl_node_new_child (applicator->node,
+                                        "operation", "gegl:translate",
+                                        "x",         (gdouble) mask_offset_x,
+                                        "y",         (gdouble) mask_offset_y,
+                                        NULL);
+
+          gegl_node_connect_to (mask_src,        "output",
+                                offset,          "input");
+          gegl_node_connect_to (offset,          "output",
+                                applicator->mode_node, "aux2");
+        }
+      else
+        {
+          gegl_node_connect_to (mask_src,        "output",
+                                applicator->mode_node, "aux2");
+        }
+    }
+
+  applicator->dest_node =
+    gegl_node_new_child (applicator->node,
+                         "operation", "gegl:write-buffer",
+                         "buffer",    dest_buffer,
+                         NULL);
+
+  if (affect == GIMP_COMPONENT_ALL)
+    {
+      gegl_node_connect_to (applicator->mode_node, "output",
+                            applicator->dest_node, "input");
+    }
+  else
+    {
+      GeglNode *affect_node;
+
+      affect_node = gegl_node_new_child (applicator->node,
+                                         "operation", "gimp:mask-components",
+                                         "mask",      affect,
+                                         NULL);
+
+      gegl_node_connect_to (applicator->src_node,  "output",
+                            affect_node,     "input");
+      gegl_node_connect_to (applicator->mode_node, "output",
+                            affect_node,     "aux");
+      gegl_node_connect_to (affect_node,     "output",
+                            applicator->dest_node, "input");
+    }
+
+  applicator->processor = gegl_node_new_processor (applicator->dest_node, NULL);
+
+  return applicator;
+}
+
+void
+gimp_applicator_apply (GimpApplicator           *applicator,
+                       GeglBuffer               *src_buffer,
+                       GeglBuffer               *apply_buffer,
+                       gint                      apply_buffer_x,
+                       gint                      apply_buffer_y,
+                       gdouble                   opacity,
+                       GimpLayerModeEffects      paint_mode)
+{
+  gint width;
+  gint height;
+
+  gegl_node_set (applicator->src_node,
+                 "buffer", src_buffer,
+                 NULL);
+
+  gegl_node_set (applicator->apply_src_node,
+                 "buffer", apply_buffer,
+                 NULL);
+
+  gegl_node_set (applicator->apply_offset_node,
+                 "x", (gdouble) apply_buffer_x,
+                 "y", (gdouble) apply_buffer_y,
+                 NULL);
+
+  gimp_gegl_mode_node_set (applicator->mode_node,
+                           paint_mode, opacity, FALSE);
+
+  width  = gegl_buffer_get_width  (apply_buffer);
+  height = gegl_buffer_get_height (apply_buffer);
+
+  gegl_processor_set_rectangle (applicator->processor,
+                                GEGL_RECTANGLE (apply_buffer_x,
+                                                apply_buffer_y,
+                                                width, height));
+
+  while (gegl_processor_work (applicator->processor, NULL));
+}
diff --git a/app/gegl/gimpapplicator.h b/app/gegl/gimpapplicator.h
new file mode 100644
index 0000000..bccd994
--- /dev/null
+++ b/app/gegl/gimpapplicator.h
@@ -0,0 +1,70 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpapplicator.h
+ * Copyright (C) 2012 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_APPLICATOR_H__
+#define __GIMP_APPLICATOR_H__
+
+
+#define GIMP_TYPE_APPLICATOR            (gimp_applicator_get_type ())
+#define GIMP_APPLICATOR(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_APPLICATOR, GimpApplicator))
+#define GIMP_APPLICATOR_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_APPLICATOR, GimpApplicatorClass))
+#define GIMP_IS_APPLICATOR(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_APPLICATOR))
+#define GIMP_IS_APPLICATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_APPLICATOR))
+#define GIMP_APPLICATOR_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_APPLICATOR, GimpApplicatorClass))
+
+
+typedef struct _GimpApplicatorClass GimpApplicatorClass;
+
+struct _GimpApplicator
+{
+  GObject        parent_instance;
+
+  GeglNode      *node;
+  GeglNode      *mode_node;
+  GeglNode      *src_node;
+  GeglNode      *apply_src_node;
+  GeglNode      *apply_offset_node;
+  GeglNode      *dest_node;
+  GeglProcessor *processor;
+};
+
+struct _GimpApplicatorClass
+{
+  GObjectClass  parent_class;
+};
+
+
+GType            gimp_applicator_get_type (void) G_GNUC_CONST;
+
+GimpApplicator * gimp_applicator_new      (GeglBuffer           *dest_buffer,
+                                           GimpComponentMask     affect,
+                                           GeglBuffer           *mask_buffer,
+                                           gint                  mask_offset_x,
+                                           gint                  mask_offset_y);
+void             gimp_applicator_apply    (GimpApplicator       *applicator,
+                                           GeglBuffer           *src_buffer,
+                                           GeglBuffer           *apply_buffer,
+                                           gint                  apply_buffer_x,
+                                           gint                  apply_buffer_y,
+                                           gdouble               opacity,
+                                           GimpLayerModeEffects  paint_mode);
+
+
+#endif  /*  __GIMP_APPLICATOR_H__  */