ash/host/transformer_helper.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ash/host/transformer_helper.h"
   6
   7 #include "ash/host/ash_window_tree_host.h"
   8 #include "ash/host/root_window_transformer.h"
   9 #include "ui/aura/window.h"
  10 #include "ui/aura/window_tree_host.h"
  11 #include "ui/compositor/dip_util.h"
  12 #include "ui/gfx/geometry/insets.h"
  13 #include "ui/gfx/geometry/rect.h"
  14 #include "ui/gfx/geometry/rect_f.h"
  15 #include "ui/gfx/geometry/size.h"
  16 #include "ui/gfx/size_conversions.h"
  17 #include "ui/gfx/transform.h"
  18
  19 namespace ash {
  20 namespace {
  21
  22 // A simple RootWindowTransformer without host insets.
  23 class SimpleRootWindowTransformer : public RootWindowTransformer {
  24  public:
  25   SimpleRootWindowTransformer(const aura::Window* root_window,
  26                               const gfx::Transform& transform)
  27       : root_window_(root_window), transform_(transform) {}
  28
  29   // RootWindowTransformer overrides:
  30   virtual gfx::Transform GetTransform() const OVERRIDE { return transform_; }
  31
  32   virtual gfx::Transform GetInverseTransform() const OVERRIDE {
  33     gfx::Transform invert;
  34     if (!transform_.GetInverse(&invert))
  35       return transform_;
  36     return invert;
  37   }
  38
  39   virtual gfx::Rect GetRootWindowBounds(const gfx::Size& host_size) const
  40       OVERRIDE {
  41     gfx::Rect bounds(host_size);
  42     gfx::RectF new_bounds(ui::ConvertRectToDIP(root_window_->layer(), bounds));
  43     transform_.TransformRect(&new_bounds);
  44     return gfx::Rect(gfx::ToFlooredSize(new_bounds.size()));
  45   }
  46
  47   virtual gfx::Insets GetHostInsets() const OVERRIDE { return gfx::Insets(); }
  48
  49  private:
  50   virtual ~SimpleRootWindowTransformer() {}
  51
  52   const aura::Window* root_window_;
  53   const gfx::Transform transform_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(SimpleRootWindowTransformer);
  56 };
  57
  58 }  // namespace
  59
  60 TransformerHelper::TransformerHelper(AshWindowTreeHost* ash_host)
  61     : ash_host_(ash_host) {
  62   SetTransform(gfx::Transform());
  63 }
  64
  65 TransformerHelper::~TransformerHelper() {}
  66
  67 gfx::Insets TransformerHelper::GetHostInsets() const {
  68   return transformer_->GetHostInsets();
  69 }
  70
  71 void TransformerHelper::SetTransform(const gfx::Transform& transform) {
  72   scoped_ptr<RootWindowTransformer> transformer(new SimpleRootWindowTransformer(
  73       ash_host_->AsWindowTreeHost()->window(), transform));
  74   SetRootWindowTransformer(transformer.Pass());
  75 }
  76
  77 void TransformerHelper::SetRootWindowTransformer(
  78     scoped_ptr<RootWindowTransformer> transformer) {
  79   transformer_ = transformer.Pass();
  80   aura::WindowTreeHost* host = ash_host_->AsWindowTreeHost();
  81   aura::Window* window = host->window();
  82   window->SetTransform(transformer_->GetTransform());
  83   // If the layer is not animating, then we need to update the root window
  84   // size immediately.
  85   if (!window->layer()->GetAnimator()->is_animating())
  86     host->UpdateRootWindowSize(host->GetBounds().size());
  87 }
  88
  89 gfx::Transform TransformerHelper::GetTransform() const {
  90   float scale = ui::GetDeviceScaleFactor(
  91       ash_host_->AsWindowTreeHost()->window()->layer());
  92   gfx::Transform transform;
  93   transform.Scale(scale, scale);
  94   transform *= transformer_->GetTransform();
  95   return transform;
  96 }
  97
  98 gfx::Transform TransformerHelper::GetInverseTransform() const {
  99   float scale = ui::GetDeviceScaleFactor(
 100       ash_host_->AsWindowTreeHost()->window()->layer());
 101   gfx::Transform transform;
 102   transform.Scale(1.0f / scale, 1.0f / scale);
 103   return transformer_->GetInverseTransform() * transform;
 104 }
 105
 106 void TransformerHelper::UpdateWindowSize(const gfx::Size& host_size) {
 107   ash_host_->AsWindowTreeHost()->window()->SetBounds(
 108       transformer_->GetRootWindowBounds(host_size));
 109 }
 110
 111 }  // namespace ash