[gimp/soc-2010-cage] app: use gegl:scale for scaling if use-gegl is TRUE

[Michael Muré <mmure src gnome org>]

commit 617a3064d04c7cc736b1379f58d7d8da579c0ef8
Author: Michael Natterer <mitch gimp org>
Date:   Sun Jun 6 19:54:44 2010 +0200

    app: use gegl:scale for scaling if use-gegl is TRUE

 app/core/gimpdrawable.c |   75 +++++++++++++++++++++++++++++++++-------------
 1 files changed, 54 insertions(+), 21 deletions(-)
---
diff --git a/app/core/gimpdrawable.c b/app/core/gimpdrawable.c
index 887769c..35db04c 100644
--- a/app/core/gimpdrawable.c
+++ b/app/core/gimpdrawable.c
@@ -33,10 +33,14 @@
 #include "paint-funcs/paint-funcs.h"
 #include "paint-funcs/scale-region.h"
 
+#include "gegl/gimp-gegl-utils.h"
+
+#include "gimp.h" /* temp for gimp_use_gegl() */
 #include "gimpchannel.h"
 #include "gimpcontext.h"
 #include "gimpdrawable-combine.h"
 #include "gimpdrawable-convert.h"
+#include "gimpdrawable-operation.h"
 #include "gimpdrawable-preview.h"
 #include "gimpdrawable-private.h"
 #include "gimpdrawable-shadow.h"
@@ -453,30 +457,59 @@ gimp_drawable_scale (GimpItem              *item,
 {
   GimpDrawable *drawable = GIMP_DRAWABLE (item);
   TileManager  *new_tiles;
-  PixelRegion   srcPR, destPR;
 
   new_tiles = tile_manager_new (new_width, new_height, drawable->bytes);
 
-  pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
-                     0, 0,
-                     gimp_item_get_width  (item),
-                     gimp_item_get_height (item),
-                     FALSE);
-  pixel_region_init (&destPR, new_tiles,
-                     0, 0,
-                     new_width, new_height,
-                     TRUE);
+  if (gimp_use_gegl (gimp_item_get_image (item)->gimp) &&
+      ! gimp_drawable_is_indexed (drawable)            &&
+      interpolation_type != GIMP_INTERPOLATION_LANCZOS)
+    {
+      GeglNode *scale;
+
+      scale = g_object_new (GEGL_TYPE_NODE,
+                            "operation", "gegl:scale",
+                            NULL);
+
+      gegl_node_set (scale,
+                     "origin-x",   0.0,
+                     "origin-y",   0.0,
+                     "filter",     gimp_interpolation_to_gegl_filter (interpolation_type),
+                     "hard-edges", FALSE,
+                     "x",          ((gdouble) new_width /
+                                    gimp_item_get_width  (item)),
+                     "y",          ((gdouble) new_height /
+                                    gimp_item_get_height (item)),
+                     NULL);
 
-  /*  Scale the drawable -
-   *   If the drawable is indexed, then we don't use pixel-value
-   *   resampling because that doesn't necessarily make sense for indexed
-   *   images.
-   */
-  scale_region (&srcPR, &destPR,
-                gimp_drawable_is_indexed (drawable) ?
-                GIMP_INTERPOLATION_NONE : interpolation_type,
-                progress ? gimp_progress_update_and_flush : NULL,
-                progress);
+      gimp_drawable_apply_operation_to_tiles (drawable, progress, _("Scale"),
+                                              scale, TRUE, new_tiles);
+      g_object_unref (scale);
+    }
+  else
+    {
+      PixelRegion srcPR, destPR;
+
+      pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
+                         0, 0,
+                         gimp_item_get_width  (item),
+                         gimp_item_get_height (item),
+                         FALSE);
+      pixel_region_init (&destPR, new_tiles,
+                         0, 0,
+                         new_width, new_height,
+                         TRUE);
+
+      /*  Scale the drawable -
+       *   If the drawable is indexed, then we don't use pixel-value
+       *   resampling because that doesn't necessarily make sense for indexed
+       *   images.
+       */
+      scale_region (&srcPR, &destPR,
+                    gimp_drawable_is_indexed (drawable) ?
+                    GIMP_INTERPOLATION_NONE : interpolation_type,
+                    progress ? gimp_progress_update_and_flush : NULL,
+                    progress);
+    }
 
   gimp_drawable_set_tiles_full (drawable, gimp_item_is_attached (item), NULL,
                                 new_tiles, gimp_drawable_type (drawable),