cc: Stop cache transform invertibility at Layer and LayerImpl

cc/layers/layer_impl.cc

 // Copyright 2012 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.
 
 #include "cc/layers/layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 52 matching lines @@
       should_flatten_transform_from_property_tree_(false),
       layer_property_changed_(false),
       masks_to_bounds_(false),
       contents_opaque_(false),
       is_root_for_isolated_group_(false),
       use_parent_backface_visibility_(false),
       use_local_transform_for_backface_visibility_(false),
       should_check_backface_visibility_(false),
       draws_content_(false),
       hide_layer_and_subtree_(false),
-      transform_is_invertible_(true),
       is_container_for_fixed_position_layers_(false),
       is_affected_by_page_scale_(true),
       was_ever_ready_since_last_transform_animation_(true),
       background_color_(0),
       safe_opaque_background_color_(0),
       opacity_(1.0),
       blend_mode_(SkXfermode::kSrcOver_Mode),
       draw_blend_mode_(SkXfermode::kSrcOver_Mode),
       num_descendants_that_draw_content_(0),
       transform_tree_index_(-1),
@@ skipping 432 matching lines @@
       is_container_for_fixed_position_layers_);
   layer->SetPositionConstraint(position_constraint_);
   layer->SetShouldFlattenTransform(should_flatten_transform_);
   layer->set_should_flatten_transform_from_property_tree(
       should_flatten_transform_from_property_tree_);
   layer->set_draw_blend_mode(draw_blend_mode_);
   layer->SetUseParentBackfaceVisibility(use_parent_backface_visibility_);
   layer->SetUseLocalTransformForBackfaceVisibility(
       use_local_transform_for_backface_visibility_);
   layer->SetShouldCheckBackfaceVisibility(should_check_backface_visibility_);
-  layer->SetTransformAndInvertibility(transform_, transform_is_invertible_);
+  layer->SetTransform(transform_);
   if (layer_property_changed_)
     layer->NoteLayerPropertyChanged();
 
   layer->SetScrollClipLayer(scroll_clip_layer_id_);
   layer->SetElementId(element_id_);
   layer->SetMutableProperties(mutable_properties_);
   layer->set_user_scrollable_horizontal(user_scrollable_horizontal_);
   layer->set_user_scrollable_vertical(user_scrollable_vertical_);
 
   layer->Set3dSortingContextId(sorting_context_id_);
@@ skipping 687 matching lines @@
 void LayerImpl::GatherFrameTimingRequestIds(std::vector<int64_t>* request_ids) {
   for (const auto& request : frame_timing_requests_)
     request_ids->push_back(request.id());
 }
 
 void LayerImpl::SetTransform(const gfx::Transform& transform) {
   if (transform_ == transform)
     return;
 
   transform_ = transform;
-  transform_is_invertible_ = transform_.IsInvertible();
-}
-
-void LayerImpl::SetTransformAndInvertibility(const gfx::Transform& transform,
-                                             bool transform_is_invertible) {
-  if (transform_ == transform) {
-    DCHECK(transform_is_invertible_ == transform_is_invertible)
-        << "Can't change invertibility if transform is unchanged";
-    return;
-  }
-  transform_ = transform;
-  transform_is_invertible_ = transform_is_invertible;
 }
 
 bool LayerImpl::TransformIsAnimating() const {
   return layer_tree_impl_->IsAnimatingTransformProperty(this);
 }
 
 bool LayerImpl::HasPotentiallyRunningTransformAnimation() const {
   return layer_tree_impl_->HasPotentiallyRunningTransformAnimation(this);
 }
 
@@ skipping 377 matching lines @@
            .layer_transforms_should_scale_layer_contents) {
     return default_scale;
   }
 
   gfx::Vector2dF transform_scales = MathUtil::ComputeTransform2dScaleComponents(
       DrawTransform(), default_scale);
   return std::max(transform_scales.x(), transform_scales.y());
 }
 
 }  // namespace cc