Stop displaying layers with non-invertible transforms.

cc/layers/layer_impl.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYERS_LAYER_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <set>
 #include <string>
 
@@ skipping 422 matching lines @@
       const gfx::PointF& screen_space_point,
       InputHandler::ScrollInputType type) const;
 
   void SetDoubleSided(bool double_sided);
   bool double_sided() const { return double_sided_; }
 
   void SetTransform(const gfx::Transform& transform);
   const gfx::Transform& transform() const { return transform_; }
   bool TransformIsAnimating() const;
   bool TransformIsAnimatingOnImplOnly() const;
+  void SetTransformAndInvertibility(const gfx::Transform& transform,
+                                    bool transform_is_invertible);
+  bool transform_is_invertible() const { return transform_is_invertible_; }
 
   // Note this rect is in layer space (not content space).
   void SetUpdateRect(const gfx::RectF& update_rect);
 
   const gfx::RectF& update_rect() const { return update_rect_; }
 
   virtual base::DictionaryValue* LayerTreeAsJson() const;
 
   void SetStackingOrderChanged(bool stacking_order_changed);
 
@@ skipping 138 matching lines @@
 
   bool masks_to_bounds_ : 1;
   bool contents_opaque_ : 1;
   bool is_root_for_isolated_group_ : 1;
   bool use_parent_backface_visibility_ : 1;
   bool draw_checkerboard_for_missing_tiles_ : 1;
   bool draws_content_ : 1;
   bool hide_layer_and_subtree_ : 1;
   bool force_render_surface_ : 1;
 
+  // Prevent calculating transform_'s invertibility too frequently.

[ajuma, 2014/03/28 18:49:07]

"Cache transform_'s invertibility to avoid needing to recompute it"?

[avallee, 2014/04/15 18:53:25]

Done.

+  bool transform_is_invertible_ : 1;
+
   // Set for the layer that other layers are fixed to.
   bool is_container_for_fixed_position_layers_ : 1;
   bool is_3d_sorted_ : 1;
   Region non_fast_scrollable_region_;
   Region touch_event_handler_region_;
   SkColor background_color_;
 
   float opacity_;
   SkXfermode::Mode blend_mode_;
   gfx::PointF position_;
@@ skipping 47 matching lines @@
   DrawProperties<LayerImpl> draw_properties_;
 
   scoped_refptr<base::debug::ConvertableToTraceFormat> debug_info_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_