[gtk+] Fix fallback render nodes

[Emmanuele Bassi <ebassi src gnome org>]

commit e7c7932d7202eb15683c589a7c6529b93aa1ab3e
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Aug 4 01:05:14 2016 -0400

    Fix fallback render nodes
    
    We were allocating a surface thats big enough for the clip, and
    we were setting the transform for that, but then GtkContainer
    was overriding the transform with the one for the allocation.
    Also, we were drawing at the clip position, not the allocation
    position.

 gtk/gtkwidget.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index f2ae75b..8946c35 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -15849,10 +15849,12 @@ gtk_widget_get_render_node (GtkWidget   *widget,
   graphene_point3d_t tmp;
   graphene_rect_t bounds;
   GtkAllocation clip;
+  GtkAllocation alloc;
 
   gtk_widget_get_clip (widget, &clip);
+  gtk_widget_get_allocation (widget, &alloc);
   graphene_rect_init (&bounds, 0, 0, clip.width, clip.height);
-  graphene_matrix_init_translate (&m, graphene_point3d_init (&tmp, clip.x, clip.y, 0.f));
+  graphene_matrix_init_translate (&m, graphene_point3d_init (&tmp, alloc.x, alloc.y, 0.f));
 
   /* Compatibility mode: if the widget does not have a render node, we draw
    * using gtk_widget_draw() on a temporary node
@@ -15862,6 +15864,7 @@ gtk_widget_get_render_node (GtkWidget   *widget,
       GskRenderNode *tmp;
       cairo_t *cr;
       char *str;
+      graphene_point3d_t p;
 
       str = g_strconcat ("Fallback<", G_OBJECT_TYPE_NAME (widget), ">", NULL);
 
@@ -15870,6 +15873,8 @@ gtk_widget_get_render_node (GtkWidget   *widget,
       gsk_render_node_set_bounds (tmp, &bounds);
       gsk_render_node_set_transform (tmp, &m);
       cr = gsk_render_node_get_draw_context (tmp);
+      cairo_translate (cr, alloc.x - clip.x, alloc.y - clip.y);
+      gsk_render_node_set_offset (tmp, graphene_point3d_init (&p, clip.x - alloc.x, clip.y - alloc.y, 0.f));
 
       gtk_widget_draw (widget, cr);