[gimp/wip/passthrough: 28/32] app: add GimpTileHandlerProjectable

[N/A <ell src gnome org>]

commit 782b158b3f4fe21a48871c78547b25d8bf5360ec
Author: Ell <ell_se yahoo com>
Date:   Sat Apr 22 14:13:07 2017 -0400

    app: add GimpTileHandlerProjectable
    
    GimpTileHandlerProjectable is similar to GimpTileHandlerValidate,
    except that it calls {begin,end}_render() on its associated
    projectable before validating.

 app/core/Makefile.am                  |    2 +
 app/core/gimptilehandlerprojectable.c |   91 +++++++++++++++++++++++++++++++++
 app/core/gimptilehandlerprojectable.h |   64 +++++++++++++++++++++++
 3 files changed, 157 insertions(+), 0 deletions(-)
---
diff --git a/app/core/Makefile.am b/app/core/Makefile.am
index 20f439f..e5f5ac6 100644
--- a/app/core/Makefile.am
+++ b/app/core/Makefile.am
@@ -396,6 +396,8 @@ libappcore_a_sources = \
        gimptempbuf.h                           \
        gimptemplate.c                          \
        gimptemplate.h                          \
+       gimptilehandlerprojectable.c            \
+       gimptilehandlerprojectable.h            \
        gimptoolinfo.c                          \
        gimptoolinfo.h                          \
        gimptooloptions.c                       \
diff --git a/app/core/gimptilehandlerprojectable.c b/app/core/gimptilehandlerprojectable.c
new file mode 100644
index 0000000..4e619f5
--- /dev/null
+++ b/app/core/gimptilehandlerprojectable.c
@@ -0,0 +1,91 @@
+/* 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 <cairo.h>
+
+#include "core-types.h"
+
+#include "gimpprojectable.h"
+
+#include "gimptilehandlerprojectable.h"
+
+
+static void   gimp_tile_handler_projectable_validate (GimpTileHandlerValidate *validate,
+                                                      const GeglRectangle     *rect,
+                                                      const Babl              *format,
+                                                      gpointer                 dest_buf,
+                                                      gint                     dest_stride);
+
+
+G_DEFINE_TYPE (GimpTileHandlerProjectable, gimp_tile_handler_projectable,
+               GIMP_TYPE_TILE_HANDLER_VALIDATE)
+
+#define parent_class gimp_tile_handler_projectable_parent_class
+
+
+static void
+gimp_tile_handler_projectable_class_init (GimpTileHandlerProjectableClass *klass)
+{
+  GimpTileHandlerValidateClass *validate_class;
+
+  validate_class = GIMP_TILE_HANDLER_VALIDATE_CLASS (klass);
+
+  validate_class->validate = gimp_tile_handler_projectable_validate;
+}
+
+static void
+gimp_tile_handler_projectable_init (GimpTileHandlerProjectable *projectable)
+{
+}
+
+static void
+gimp_tile_handler_projectable_validate (GimpTileHandlerValidate *validate,
+                                        const GeglRectangle     *rect,
+                                        const Babl              *format,
+                                        gpointer                 dest_buf,
+                                        gint                     dest_stride)
+{
+  GimpTileHandlerProjectable *handler = GIMP_TILE_HANDLER_PROJECTABLE (validate);
+  GeglNode                   *graph;
+
+  graph = gimp_projectable_get_graph (handler->projectable);
+
+  gimp_projectable_begin_render (handler->projectable);
+
+  gegl_node_blit (graph, 1.0, rect, format,
+                  dest_buf, dest_stride,
+                  GEGL_BLIT_DEFAULT);
+
+  gimp_projectable_end_render (handler->projectable);
+}
+
+GeglTileHandler *
+gimp_tile_handler_projectable_new (GimpProjectable *projectable)
+{
+  GimpTileHandlerProjectable *handler;
+
+  g_return_val_if_fail (GIMP_IS_PROJECTABLE (projectable), NULL);
+
+  handler = g_object_new (GIMP_TYPE_TILE_HANDLER_PROJECTABLE, NULL);
+
+  handler->projectable = projectable;
+
+  return GEGL_TILE_HANDLER (handler);
+}
diff --git a/app/core/gimptilehandlerprojectable.h b/app/core/gimptilehandlerprojectable.h
new file mode 100644
index 0000000..ead7ed1
--- /dev/null
+++ b/app/core/gimptilehandlerprojectable.h
@@ -0,0 +1,64 @@
+/* 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/>.
+ */
+
+#ifndef __GIMP_TILE_HANDLER_PROJECTABLE_H__
+#define __GIMP_TILE_HANDLER_PROJECTABLE_H__
+
+
+#include "gegl/gimptilehandlervalidate.h"
+
+
+/***
+ * GimpTileHandlerProjectable is a GeglTileHandler that renders a
+ * projectable, calling the projectable's begin_render() and end_render()
+ * before/after the actual rendering.
+ *
+ * Note that the tile handler does not own a reference to the projectable.
+ * It's the user's responsibility to manage the handler's and projectable's
+ * lifetime.
+ */
+
+#define GIMP_TYPE_TILE_HANDLER_PROJECTABLE            (gimp_tile_handler_projectable_get_type ())
+#define GIMP_TILE_HANDLER_PROJECTABLE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), 
GIMP_TYPE_TILE_HANDLER_PROJECTABLE, GimpTileHandlerProjectable))
+#define GIMP_TILE_HANDLER_PROJECTABLE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  
GIMP_TYPE_TILE_HANDLER_PROJECTABLE, GimpTileHandlerProjectableClass))
+#define GIMP_IS_TILE_HANDLER_PROJECTABLE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), 
GIMP_TYPE_TILE_HANDLER_PROJECTABLE))
+#define GIMP_IS_TILE_HANDLER_PROJECTABLE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  
GIMP_TYPE_TILE_HANDLER_PROJECTABLE))
+#define GIMP_TILE_HANDLER_PROJECTABLE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  
GIMP_TYPE_TILE_HANDLER_PROJECTABLE, GimpTileHandlerProjectableClass))
+
+
+typedef struct _GimpTileHandlerProjectable      GimpTileHandlerProjectable;
+typedef struct _GimpTileHandlerProjectableClass GimpTileHandlerProjectableClass;
+
+struct _GimpTileHandlerProjectable
+{
+  GimpTileHandlerValidate  parent_instance;
+
+  GimpProjectable         *projectable;
+};
+
+struct _GimpTileHandlerProjectableClass
+{
+  GimpTileHandlerValidateClass  parent_class;
+};
+
+
+GType             gimp_tile_handler_projectable_get_type (void) G_GNUC_CONST;
+
+GeglTileHandler * gimp_tile_handler_projectable_new      (GimpProjectable *projectable);
+
+
+#endif /* __GIMP_TILE_HANDLER_PROJECTABLE_H__ */