[gtk+] Clean up gdk_draw_drawable() composite handling

[Alexander Larsson <alexl src gnome org>]

commit c2546c859d3f41b0bf736c94101a9d65ea538afa
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Aug 25 10:34:10 2009 +0200

    Clean up gdk_draw_drawable() composite handling
    
    Instead of doing some magic in gdk_draw_drawable() to avoid double
    offsetting when calling gdk_draw_drawable on the impl we call
    the vfunc directly on the impl. Thus removing the weird magic from
    gdk_draw_drawable().
    
    I tested this with the testgtk test "text", where if the original magic
    code is disabled typing a newline in the middle of a text line causes
    the double offset issue to appear.

 gdk/gdkdraw.c   |   17 +++--------------
 gdk/gdkpixmap.c |   12 ++++++++----
 gdk/gdkwindow.c |   10 ++++++++--
 3 files changed, 19 insertions(+), 20 deletions(-)
---
diff --git a/gdk/gdkdraw.c b/gdk/gdkdraw.c
index 041d94e..829dd2b 100644
--- a/gdk/gdkdraw.c
+++ b/gdk/gdkdraw.c
@@ -634,7 +634,7 @@ gdk_draw_drawable (GdkDrawable *drawable,
 		   gint         width,
 		   gint         height)
 {
-  GdkDrawable *composite, *composite_impl;
+  GdkDrawable *composite;
   gint composite_x_offset = 0;
   gint composite_y_offset = 0;
 
@@ -663,24 +663,13 @@ gdk_draw_drawable (GdkDrawable *drawable,
                                                           &composite_x_offset,
                                                           &composite_y_offset);
 
-  /* The draw_drawable call below is will recurse into gdk_draw_drawable again,
-   * specifying the right impl for the destination. This means the composite
-   * we got here will be fed to get_composite_drawable again, which is a problem
-   * for window as that causes double the composite offset. Avoid this by passing
-   * in the impl directly.
-   */
-  if (GDK_IS_WINDOW (composite))
-    composite_impl = GDK_WINDOW_OBJECT (src)->impl;
-  else
-    composite_impl = composite;
-
   /* TODO: For non-native windows this may copy stuff from other overlapping
      windows. We should clip that and (for windows with bg != None) clear that
      area in the destination instead. */
 
   if (GDK_DRAWABLE_GET_CLASS (drawable)->draw_drawable_with_src)
     GDK_DRAWABLE_GET_CLASS (drawable)->draw_drawable_with_src (drawable, gc,
-							       composite_impl,
+							       composite,
 							       xsrc - composite_x_offset,
 							       ysrc - composite_y_offset,
 							       xdest, ydest,
@@ -688,7 +677,7 @@ gdk_draw_drawable (GdkDrawable *drawable,
 							       src);
   else /* backwards compat for old out-of-tree implementations of GdkDrawable (are there any?) */
     GDK_DRAWABLE_GET_CLASS (drawable)->draw_drawable (drawable, gc,
-						      composite_impl,
+						      composite,
 						      xsrc - composite_x_offset,
 						      ysrc - composite_y_offset,
 						      xdest, ydest,
diff --git a/gdk/gdkpixmap.c b/gdk/gdkpixmap.c
index 3d29805..919a202 100644
--- a/gdk/gdkpixmap.c
+++ b/gdk/gdkpixmap.c
@@ -385,10 +385,14 @@ gdk_pixmap_draw_drawable (GdkDrawable *drawable,
 {
   GdkPixmapObject *private = (GdkPixmapObject *)drawable;
 
-  _gdk_gc_remove_drawable_clip (gc);  
-  gdk_draw_drawable (private->impl, gc, src, xsrc, ysrc,
-                     xdest, ydest,
-                     width, height);
+  _gdk_gc_remove_drawable_clip (gc);
+  /* Call the method directly to avoid getting the composite drawable again */
+  GDK_DRAWABLE_GET_CLASS (private->impl)->draw_drawable_with_src (private->impl, gc,
+								  src,
+								  xsrc, ysrc,
+								  xdest, ydest,
+								  width, height,
+								  original_src);
 }
 
 static void
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 977861e..7ca6c3c 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -3654,8 +3654,14 @@ gdk_window_draw_drawable (GdkDrawable *drawable,
 
   BEGIN_DRAW;
 
-  gdk_draw_drawable (impl, gc, src, xsrc, ysrc,
-		     xdest - x_offset, ydest - y_offset, width, height);
+  /* Call the method directly to avoid getting the composite drawable again */
+  GDK_DRAWABLE_GET_CLASS (impl)->draw_drawable_with_src (impl, gc,
+							 src,
+							 xsrc, ysrc,
+							 xdest - x_offset,
+							 ydest - y_offset,
+							 width, height,
+							 original_src);
 
   if (!private->paint_stack)
     {