[gimp/goat-invasion: 133/608] app: port all implementations of GimpProjectable::get_opacity_at() to Gegl

[Michael Natterer <mitch src gnome org>]

commit 4f9354a956a8c743407d8dda4d3a735b9878e575
Author: Michael Natterer <mitch gimp org>
Date:   Sun Mar 18 19:56:56 2012 +0100

    app: port all implementations of GimpProjectable::get_opacity_at() to Gegl

 app/core/gimpchannel.c |   30 ++++++++++++++++--------------
 app/core/gimplayer.c   |   23 +++++++++--------------
 2 files changed, 25 insertions(+), 28 deletions(-)
---
diff --git a/app/core/gimpchannel.c b/app/core/gimpchannel.c
index 18e5494..039c835 100644
--- a/app/core/gimpchannel.c
+++ b/app/core/gimpchannel.c
@@ -969,32 +969,34 @@ gimp_channel_get_opacity_at (GimpPickable *pickable,
                              gint          y)
 {
   GimpChannel *channel = GIMP_CHANNEL (pickable);
-  Tile        *tile;
-  gint         val;
+  guchar       value;
 
   /*  Some checks to cut back on unnecessary work  */
   if (channel->bounds_known)
     {
-      if (channel->empty)
-        return 0;
-      else if (x < channel->x1 || x >= channel->x2 ||
-               y < channel->y1 || y >= channel->y2)
-        return 0;
+      if (channel->empty   ||
+          x <  channel->x1 ||
+          x >= channel->x2 ||
+          y <  channel->y1 ||
+          y >= channel->y2)
+        {
+          return 0;
+        }
     }
   else
     {
       if (x < 0 || x >= gimp_item_get_width  (GIMP_ITEM (channel)) ||
           y < 0 || y >= gimp_item_get_height (GIMP_ITEM (channel)))
-        return 0;
+        {
+          return 0;
+        }
     }
 
-  tile = tile_manager_get_tile (gimp_drawable_get_tiles (GIMP_DRAWABLE (channel)),
-                                x, y,
-                                TRUE, FALSE);
-  val = *(guchar *) (tile_data_pointer (tile, x, y));
-  tile_release (tile, FALSE);
+  gegl_buffer_sample (gimp_drawable_get_read_buffer (GIMP_DRAWABLE (channel)),
+                      x, y, NULL, &value, babl_format ("Y u8"),
+                      GEGL_SAMPLER_NEAREST);
 
-  return val;
+  return value;
 }
 
 static gboolean
diff --git a/app/core/gimplayer.c b/app/core/gimplayer.c
index 22a1368..c8402e1 100644
--- a/app/core/gimplayer.c
+++ b/app/core/gimplayer.c
@@ -962,8 +962,7 @@ gimp_layer_get_opacity_at (GimpPickable *pickable,
                            gint          y)
 {
   GimpLayer *layer = GIMP_LAYER (pickable);
-  Tile      *tile;
-  gint       val   = 0;
+  guchar     value;
 
   if (x >= 0 && x < gimp_item_get_width  (GIMP_ITEM (layer)) &&
       y >= 0 && y < gimp_item_get_height (GIMP_ITEM (layer)) &&
@@ -978,26 +977,22 @@ gimp_layer_get_opacity_at (GimpPickable *pickable,
       /*  Otherwise, determine if the alpha value at
        *  the given point is non-zero
        */
-      tile = tile_manager_get_tile (gimp_drawable_get_tiles (GIMP_DRAWABLE (layer)),
-                                    x, y, TRUE, FALSE);
-
-      val = * ((const guchar *) tile_data_pointer (tile, x, y) +
-               tile_bpp (tile) - 1);
+      gegl_buffer_sample (gimp_drawable_get_read_buffer (GIMP_DRAWABLE (layer)),
+                          x, y, NULL, &value, babl_format ("A u8"),
+                          GEGL_SAMPLER_NEAREST);
 
       if (layer->mask)
         {
-          gint mask_val;
+          gint mask_value;
 
-          mask_val = gimp_pickable_get_opacity_at (GIMP_PICKABLE (layer->mask),
-                                                   x, y);
+          mask_value = gimp_pickable_get_opacity_at (GIMP_PICKABLE (layer->mask),
+                                                     x, y);
 
-          val = val * mask_val / 255;
+          value = value * mask_value / 255;
         }
-
-      tile_release (tile, FALSE);
     }
 
-  return val;
+  return value;
 }
 
 static void