[gimp/gimp-2-10] app: add support for offset buffers in gimp_gegl_apply_[cached_]operation()

[Ell <ell src gnome org>]

commit 92bec259ac426ea70f8e6007a01742c020e8a49a
Author: Ell <ell_se yahoo com>
Date:   Wed May 29 05:35:30 2019 -0400

    app: add support for offset buffers in gimp_gegl_apply_[cached_]operation()
    
    In gimp_gegl_apply_[cached_]operation(), add support for output
    buffers whose extent's top-left corner is not (0, 0).  This is
    needed by the previous commit.
    
    (cherry picked from commit a6393e6c5518f6b563b9179d6f5c76b07d2822a2)

 app/gegl/gimp-gegl-apply-operation.c | 26 +++++++++-----------------
 1 file changed, 9 insertions(+), 17 deletions(-)
---
diff --git a/app/gegl/gimp-gegl-apply-operation.c b/app/gegl/gimp-gegl-apply-operation.c
index 2c8d35521f..ad838cd41e 100644
--- a/app/gegl/gimp-gegl-apply-operation.c
+++ b/app/gegl/gimp-gegl-apply-operation.c
@@ -84,7 +84,6 @@ gimp_gegl_apply_cached_operation (GeglBuffer          *src_buffer,
   GeglNode          *operation_src_node = NULL;
   GimpChunkIterator *iter;
   cairo_region_t    *region;
-  GeglRectangle      rect = { 0, };
   gboolean           progress_started   = FALSE;
   gboolean           cancel             = FALSE;
   gint               all_pixels;
@@ -98,15 +97,8 @@ gimp_gegl_apply_cached_operation (GeglBuffer          *src_buffer,
   g_return_val_if_fail (valid_rects == NULL || cache != NULL, FALSE);
   g_return_val_if_fail (valid_rects == NULL || n_valid_rects != 0, FALSE);
 
-  if (dest_rect)
-    {
-      rect = *dest_rect;
-    }
-  else
-    {
-      rect = *GEGL_RECTANGLE (0, 0, gegl_buffer_get_width  (dest_buffer),
-                                    gegl_buffer_get_height (dest_buffer));
-    }
+  if (! dest_rect)
+    dest_rect = gegl_buffer_get_extent (dest_buffer);
 
   gegl = gegl_node_new ();
 
@@ -151,10 +143,10 @@ gimp_gegl_apply_cached_operation (GeglBuffer          *src_buffer,
 
           crop_node = gegl_node_new_child (gegl,
                                            "operation", "gegl:crop",
-                                           "x",         (gdouble) rect.x,
-                                           "y",         (gdouble) rect.y,
-                                           "width",     (gdouble) rect.width,
-                                           "height",    (gdouble) rect.height,
+                                           "x",         (gdouble) dest_rect->x,
+                                           "y",         (gdouble) dest_rect->y,
+                                           "width",     (gdouble) dest_rect->width,
+                                           "height",    (gdouble) dest_rect->height,
                                            NULL);
 
           gegl_node_connect_to (src_node,  "output",
@@ -216,10 +208,10 @@ gimp_gegl_apply_cached_operation (GeglBuffer          *src_buffer,
 
   gegl_buffer_freeze_changed (dest_buffer);
 
-  all_pixels  = rect.width * rect.height;
+  all_pixels  = dest_rect->width * dest_rect->height;
   done_pixels = 0;
 
-  region = cairo_region_create_rectangle ((cairo_rectangle_int_t *) &rect);
+  region = cairo_region_create_rectangle ((cairo_rectangle_int_t *) dest_rect);
 
   if (cache)
     {
@@ -230,7 +222,7 @@ gimp_gegl_apply_cached_operation (GeglBuffer          *src_buffer,
           GeglRectangle valid_rect;
 
           if (! gegl_rectangle_intersect (&valid_rect,
-                                          &valid_rects[i], &rect))
+                                          &valid_rects[i], dest_rect))
             {
               continue;
             }