Make scroll offset type of float in cc

cc/trees/layer_tree_impl.cc

 // 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.
 
 #include "cc/trees/layer_tree_impl.h"
 
 #include <limits>
 #include <set>
 
 #include "base/debug/trace_event.h"
@@ skipping 25 matching lines @@
 // InnerViewportScrollLayer and the OuterViewportScrollLayer in a manner
 // that never requires the embedder or LayerImpl to know about.
 class LayerScrollOffsetDelegateProxy : public LayerImpl::ScrollOffsetDelegate {
  public:
   LayerScrollOffsetDelegateProxy(LayerImpl* layer,
                                  LayerScrollOffsetDelegate* delegate,
                                  LayerTreeImpl* layer_tree)
       : layer_(layer), delegate_(delegate), layer_tree_impl_(layer_tree) {}
   virtual ~LayerScrollOffsetDelegateProxy() {}
 
-  gfx::Vector2dF last_set_scroll_offset() const {
+  gfx::ScrollOffset last_set_scroll_offset() const {
     return last_set_scroll_offset_;
   }
 
   // LayerScrollOffsetDelegate implementation.
-  virtual void SetTotalScrollOffset(const gfx::Vector2dF& new_offset) OVERRIDE {
+  virtual void SetTotalScrollOffset(
+      const gfx::ScrollOffset& new_offset) OVERRIDE {
     last_set_scroll_offset_ = new_offset;
     layer_tree_impl_->UpdateScrollOffsetDelegate();
   }
 
-  virtual gfx::Vector2dF GetTotalScrollOffset() OVERRIDE {
+  virtual gfx::ScrollOffset GetTotalScrollOffset() OVERRIDE {
     return layer_tree_impl_->GetDelegatedScrollOffset(layer_);
   }
 
   virtual bool IsExternalFlingActive() const OVERRIDE {
     return delegate_->IsExternalFlingActive();
   }
 
  private:
   LayerImpl* layer_;
   LayerScrollOffsetDelegate* delegate_;
   LayerTreeImpl* layer_tree_impl_;
-  gfx::Vector2dF last_set_scroll_offset_;
+  gfx::ScrollOffset last_set_scroll_offset_;
 };
 
 LayerTreeImpl::LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl)
     : layer_tree_host_impl_(layer_tree_host_impl),
       source_frame_number_(-1),
       hud_layer_(0),
       currently_scrolling_layer_(NULL),
       root_layer_scroll_offset_delegate_(NULL),
       background_color_(0),
       has_transparent_background_(false),
@@ skipping 54 matching lines @@
 }
 
 LayerImpl* LayerTreeImpl::InnerViewportScrollLayer() const {
   return inner_viewport_scroll_layer_;
 }
 
 LayerImpl* LayerTreeImpl::OuterViewportScrollLayer() const {
   return outer_viewport_scroll_layer_;
 }
 
-gfx::Vector2dF LayerTreeImpl::TotalScrollOffset() const {
-  gfx::Vector2dF offset;
+gfx::ScrollOffset LayerTreeImpl::TotalScrollOffset() const {
+  gfx::ScrollOffset offset;
 
   if (inner_viewport_scroll_layer_)
     offset += inner_viewport_scroll_layer_->TotalScrollOffset();
 
   if (outer_viewport_scroll_layer_)
     offset += outer_viewport_scroll_layer_->TotalScrollOffset();
 
   return offset;
 }
 
-gfx::Vector2dF LayerTreeImpl::TotalMaxScrollOffset() const {
-  gfx::Vector2dF offset;
+gfx::ScrollOffset LayerTreeImpl::TotalMaxScrollOffset() const {
+  gfx::ScrollOffset offset;
 
   if (inner_viewport_scroll_layer_)
     offset += inner_viewport_scroll_layer_->MaxScrollOffset();
 
   if (outer_viewport_scroll_layer_)
     offset += outer_viewport_scroll_layer_->MaxScrollOffset();
 
   return offset;
 }
 gfx::Vector2dF LayerTreeImpl::TotalScrollDelta() const {
@@ skipping 746 matching lines @@
       outer_viewport_scroll_layer_->SetScrollOffsetDelegate(
           outer_viewport_scroll_delegate_proxy_.get());
     }
   }
 }
 
 void LayerTreeImpl::UpdateScrollOffsetDelegate() {
   DCHECK(InnerViewportScrollLayer());
   DCHECK(root_layer_scroll_offset_delegate_);
 
-  gfx::Vector2dF offset =
+  gfx::ScrollOffset offset =
       inner_viewport_scroll_delegate_proxy_->last_set_scroll_offset();
 
   if (OuterViewportScrollLayer())
     offset += outer_viewport_scroll_delegate_proxy_->last_set_scroll_offset();
 
   root_layer_scroll_offset_delegate_->UpdateRootLayerState(
       offset,
       TotalMaxScrollOffset(),
       ScrollableSize(),
       total_page_scale_factor(),
       min_page_scale_factor(),
       max_page_scale_factor());
 }
 
-gfx::Vector2dF LayerTreeImpl::GetDelegatedScrollOffset(LayerImpl* layer) {
+gfx::ScrollOffset LayerTreeImpl::GetDelegatedScrollOffset(LayerImpl* layer) {
   DCHECK(root_layer_scroll_offset_delegate_);
   DCHECK(InnerViewportScrollLayer());
   if (layer == InnerViewportScrollLayer() && !OuterViewportScrollLayer())
     return root_layer_scroll_offset_delegate_->GetTotalScrollOffset();
 
   // If we get here, we have both inner/outer viewports, and need to distribute
   // the scroll offset between them.
   DCHECK(inner_viewport_scroll_delegate_proxy_);
   DCHECK(outer_viewport_scroll_delegate_proxy_);
-  gfx::Vector2dF inner_viewport_offset =
+  gfx::ScrollOffset inner_viewport_offset =
       inner_viewport_scroll_delegate_proxy_->last_set_scroll_offset();
-  gfx::Vector2dF outer_viewport_offset =
+  gfx::ScrollOffset outer_viewport_offset =
       outer_viewport_scroll_delegate_proxy_->last_set_scroll_offset();
 
   // It may be nothing has changed.
-  gfx::Vector2dF delegate_offset =
+  gfx::ScrollOffset delegate_offset =
       root_layer_scroll_offset_delegate_->GetTotalScrollOffset();
   if (inner_viewport_offset + outer_viewport_offset == delegate_offset) {
     if (layer == InnerViewportScrollLayer())
       return inner_viewport_offset;
     else
       return outer_viewport_offset;
   }
 
-  gfx::Vector2d max_outer_viewport_scroll_offset =
+  gfx::ScrollOffset max_outer_viewport_scroll_offset =
       OuterViewportScrollLayer()->MaxScrollOffset();
 
   outer_viewport_offset = delegate_offset - inner_viewport_offset;
   outer_viewport_offset.SetToMin(max_outer_viewport_scroll_offset);
-  outer_viewport_offset.SetToMax(gfx::Vector2d());
+  outer_viewport_offset.SetToMax(gfx::ScrollOffset());
 
   if (layer == OuterViewportScrollLayer())
     return outer_viewport_offset;
 
   inner_viewport_offset = delegate_offset - outer_viewport_offset;
 
   return inner_viewport_offset;
 }
 
 void LayerTreeImpl::QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise) {
@@ skipping 464 matching lines @@
 
 void LayerTreeImpl::InputScrollAnimationFinished() {
   layer_tree_host_impl_->ScrollEnd();
 }
 
 BlockingTaskRunner* LayerTreeImpl::BlockingMainThreadTaskRunner() const {
   return proxy()->blocking_main_thread_task_runner();
 }
 
 }  // namespace cc