[mutter] clutter/stage: Offset framebuffer capture origin by view layout

[Jonas Ådahl <jadahl src gnome org>]

commit f36fa53b0e8b7e2389ea2b63516a2eb00fcc7aa5
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Aug 19 10:45:08 2016 +0800

    clutter/stage: Offset framebuffer capture origin by view layout
    
    The rectangle passed to capture_view() is in stage coordinate space;
    thus, to translate to framebuffer coordinate space, the origin need to
    be translated by the view layout position.
    
    This fixes capturing views not at position (0, 0).
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770127

 clutter/clutter/clutter-stage.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index edbc9b4..85cb343 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -4676,6 +4676,7 @@ capture_view (ClutterStage          *stage,
   uint8_t *data;
   int stride;
   CoglBitmap *bitmap;
+  cairo_rectangle_int_t view_layout;
 
   framebuffer = clutter_stage_view_get_framebuffer (view);
 
@@ -4700,8 +4701,11 @@ capture_view (ClutterStage          *stage,
                                      stride,
                                      data);
 
+  clutter_stage_view_get_layout (view, &view_layout);
+
   cogl_framebuffer_read_pixels_into_bitmap (framebuffer,
-                                            rect->x, rect->y,
+                                            view_layout.x - rect->x,
+                                            view_layout.y - rect->y,
                                             COGL_READ_PIXELS_COLOR_BUFFER,
                                             bitmap);