Move DIP translation from ui/aura to ui/compositor

ui/gfx/compositor/layer.cc

 // Copyright (c) 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 "ui/gfx/compositor/layer.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebContentLayer.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebExternalTextureLayer.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebFilterOperation.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebFilterOperations.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebFloatPoint.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebFloatRect.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebSize.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebSolidColorLayer.h"
 #include "ui/base/animation/animation.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/compositor/compositor_switches.h"
+#include "ui/gfx/compositor/dip_util.h"
 #include "ui/gfx/compositor/layer_animator.h"
 #include "ui/gfx/interpolated_transform.h"
 #include "ui/gfx/point3.h"
 
 namespace {
 
 const float EPSILON = 1e-3f;
 
 bool IsApproximateMultipleOf(float value, float base) {
   float remainder = fmod(fabs(value), base);
   return remainder < EPSILON || base - remainder < EPSILON;
 }
 
 const ui::Layer* GetRoot(const ui::Layer* layer) {
   return layer->parent() ? GetRoot(layer->parent()) : layer;
 }
 
 }  // namespace
 
 namespace ui {
 
 Layer::Layer()
     : type_(LAYER_TEXTURED),
       compositor_(NULL),
       parent_(NULL),
       visible_(true),
       fills_bounds_opaquely_(true),
       layer_updated_externally_(false),
       opacity_(1.0f),
-      delegate_(NULL) {
+      delegate_(NULL),
+      scale_canvas_(true),
+      device_scale_factor_(0.0f) {

[sky, 2012/05/08 00:41:59]

I would have expected this to be 1 by default. How come it's 0?

[oshima, 2012/05/08 01:27:25]

This was poison value I used while testing to detect the case where scale wasn't
set. Changed to 1.0f.

   CreateWebLayer();
 }
 
 Layer::Layer(LayerType type)
     : type_(type),
       compositor_(NULL),
       parent_(NULL),
       visible_(true),
       fills_bounds_opaquely_(true),
       layer_updated_externally_(false),
       opacity_(1.0f),
-      delegate_(NULL) {
+      delegate_(NULL),
+      scale_canvas_(true),
+      device_scale_factor_(0.0f) {
   CreateWebLayer();
 }
 
 Layer::~Layer() {
   // Destroying the animator may cause observers to use the layer (and
   // indirectly the WebLayer). Destroy the animator first so that the WebLayer
   // is still around.
   animator_.reset();
   if (compositor_)
     compositor_->SetRootLayer(NULL);
   if (parent_)
     parent_->Remove(this);
   for (size_t i = 0; i < children_.size(); ++i)
     children_[i]->parent_ = NULL;
   web_layer_.removeFromParent();
 }
 
 Compositor* Layer::GetCompositor() {
   return GetRoot(this)->compositor_;
 }
 
 void Layer::SetCompositor(Compositor* compositor) {
   // This function must only be called to set the compositor on the root layer,
   // or to reset it.
   DCHECK(!compositor || !compositor_);
   DCHECK(!compositor || compositor->root_layer() == this);
   DCHECK(!parent_);
   compositor_ = compositor;
+  if (IsDIPEnabled() &&
+      compositor && device_scale_factor_ != compositor->device_scale_factor()) {
+    OnDeviceScaleFactorChanged(compositor->device_scale_factor());
+  }
 }
 
 void Layer::Add(Layer* child) {
   DCHECK(!child->compositor_);
   if (child->parent_)
     child->parent_->Remove(child);
   child->parent_ = this;
   children_.push_back(child);
   web_layer_.addChild(child->web_layer_);
+  if (IsDIPEnabled() && device_scale_factor_ != child->device_scale_factor_)
+    child->OnDeviceScaleFactorChanged(device_scale_factor_);
 }
 
 void Layer::Remove(Layer* child) {
   std::vector<Layer*>::iterator i =
       std::find(children_.begin(), children_.end(), child);
   DCHECK(i != children_.end());
   children_.erase(i);
   child->parent_ = NULL;
   child->web_layer_.removeFromParent();
 }
@@ skipping 114 matching lines @@
 // static
 void Layer::ConvertPointToLayer(const Layer* source,
                                 const Layer* target,
                                 gfx::Point* point) {
   if (source == target)
     return;
 
   const Layer* root_layer = GetRoot(source);
   CHECK_EQ(root_layer, GetRoot(target));
 
+  // TODO(oshima): We probably need to handle source's root != target's root
+  // case under multi monitor environment.
   if (source != root_layer)
     source->ConvertPointForAncestor(root_layer, point);
   if (target != root_layer)
     target->ConvertPointFromAncestor(root_layer, point);
 }
 
 void Layer::SetFillsBoundsOpaquely(bool fills_bounds_opaquely) {
   if (fills_bounds_opaquely_ == fills_bounds_opaquely)
     return;
 
@@ skipping 43 matching lines @@
   DCHECK_EQ(type_, LAYER_SOLID_COLOR);
   // WebColor is equivalent to SkColor, per WebColor.h.
   web_layer_.to<WebKit::WebSolidColorLayer>().setBackgroundColor(
       static_cast<WebKit::WebColor>(color));
   SetFillsBoundsOpaquely(SkColorGetA(color) == 0xFF);
 }
 
 bool Layer::SchedulePaint(const gfx::Rect& invalid_rect) {
   if (type_ == LAYER_SOLID_COLOR || !delegate_)
     return false;
-  damaged_region_.op(invalid_rect.x(),
-                     invalid_rect.y(),
-                     invalid_rect.right(),
-                     invalid_rect.bottom(),
+  gfx::Rect invalid_rect_in_pixel = ConvertRectToPixel(this, invalid_rect);
+  damaged_region_.op(invalid_rect_in_pixel.x(),
+                     invalid_rect_in_pixel.y(),
+                     invalid_rect_in_pixel.right(),
+                     invalid_rect_in_pixel.bottom(),
                      SkRegion::kUnion_Op);
   ScheduleDraw();
   return true;
 }
 
 void Layer::ScheduleDraw() {
   Compositor* compositor = GetCompositor();
   if (compositor)
     compositor->ScheduleDraw();
 }
@@ skipping 21 matching lines @@
 }
 
 void Layer::SuppressPaint() {
   if (!delegate_)
     return;
   delegate_ = NULL;
   for (size_t i = 0; i < children_.size(); ++i)
     children_[i]->SuppressPaint();
 }
 
+void Layer::OnDeviceScaleFactorChanged(float device_scale_factor) {
+  CHECK(IsDIPEnabled());
+  if (device_scale_factor_ == device_scale_factor)
+    return;
+  device_scale_factor_ = device_scale_factor;
+  RecomputeTransform();
+  RecomputeDrawsContentAndUVRect();
+  for (size_t i = 0; i < children_.size(); ++i)
+    children_[i]->OnDeviceScaleFactorChanged(device_scale_factor);
+}
+
 void Layer::paintContents(WebKit::WebCanvas* web_canvas,
                           const WebKit::WebRect& clip) {
   TRACE_EVENT0("ui", "Layer::paintContents");
   gfx::Canvas canvas(web_canvas);
+  bool scale_canvas = IsDIPEnabled() && scale_canvas_;
+  if (scale_canvas) {
+    canvas.sk_canvas()->scale(SkFloatToScalar(device_scale_factor_),
+                              SkFloatToScalar(device_scale_factor_));
+  }
   if (delegate_)
     delegate_->OnPaintLayer(&canvas);
+  if (scale_canvas)
+    canvas.Restore();
 }
 
 float Layer::GetCombinedOpacity() const {
   float opacity = opacity_;
   Layer* current = this->parent_;
   while (current) {
     opacity *= current->opacity_;
     current = current->parent_;
   }
   return opacity;
@@ skipping 137 matching lines @@
   if (type_ == LAYER_SOLID_COLOR)
     web_layer_ = WebKit::WebSolidColorLayer::create();
   else
     web_layer_ = WebKit::WebContentLayer::create(this);
   web_layer_.setAnchorPoint(WebKit::WebFloatPoint(0.f, 0.f));
   web_layer_.setOpaque(true);
   web_layer_is_accelerated_ = false;
   show_debug_borders_ = CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kUIShowLayerBorders);
   web_layer_.setDebugBorderWidth(show_debug_borders_ ? 2 : 0);
-  RecomputeDrawsContentAndUVRect();
-  RecomputeDebugBorderColor();
 }
 
 void Layer::RecomputeTransform() {
-  ui::Transform transform = transform_;
-  transform.ConcatTranslate(bounds_.x(), bounds_.y());
-  web_layer_.setTransform(transform.matrix());
+  if (IsDIPEnabled()) {
+    ui::Transform scale_translate;
+    scale_translate.matrix().set3x3(device_scale_factor_, 0, 0,
+                                    0, device_scale_factor_, 0,
+                                    0, 0, 1);
+    // Start with the inverse matrix of above.
+    Transform transform;
+    transform.matrix().set3x3(1.0f / device_scale_factor_, 0, 0,
+                              0, 1.0f / device_scale_factor_, 0,
+                              0, 0, 1);
+    transform.ConcatTransform(transform_);
+    transform.ConcatTranslate(bounds_.x(), bounds_.y());
+    transform.ConcatTransform(scale_translate);
+    web_layer_.setTransform(transform.matrix());
+  } else {
+    Transform t = transform_;
+    t.ConcatTranslate(bounds_.x(), bounds_.y());
+    web_layer_.setTransform(t.matrix());
+  }
 }
 
 void Layer::RecomputeDrawsContentAndUVRect() {
   DCHECK(!web_layer_.isNull());
   bool should_draw = type_ != LAYER_NOT_DRAWN;
   if (!web_layer_is_accelerated_) {
     if (type_ != LAYER_SOLID_COLOR)
       web_layer_.to<WebKit::WebContentLayer>().setDrawsContent(should_draw);
-    web_layer_.setBounds(bounds_.size());
+    web_layer_.setBounds(ConvertSizeToPixel(this, bounds_.size()));
   } else {
     DCHECK(texture_);
     unsigned int texture_id = texture_->texture_id();
     WebKit::WebExternalTextureLayer texture_layer =
         web_layer_.to<WebKit::WebExternalTextureLayer>();
     texture_layer.setTextureId(should_draw ? texture_id : 0);
+    gfx::Rect bounds_in_pixel = ConvertRectToPixel(this, bounds());
     gfx::Size texture_size = texture_->size();
-    gfx::Size size(std::min(bounds_.width(), texture_size.width()),
-                   std::min(bounds_.height(), texture_size.height()));
+    gfx::Size size(std::min(bounds_in_pixel.width(), texture_size.width()),
+                   std::min(bounds_in_pixel.height(), texture_size.height()));
     WebKit::WebFloatRect rect(
         0,
         0,
         static_cast<float>(size.width())/texture_size.width(),
         static_cast<float>(size.height())/texture_size.height());
     texture_layer.setUVRect(rect);
     web_layer_.setBounds(size);
   }
 }
 
 void Layer::RecomputeDebugBorderColor() {
   if (!show_debug_borders_)
     return;
   unsigned int color = 0xFF000000;
   color |= web_layer_is_accelerated_ ? 0x0000FF00 : 0x00FF0000;
   bool opaque = fills_bounds_opaquely_ && (GetCombinedOpacity() == 1.f);
   if (!opaque)
     color |= 0xFF;
   web_layer_.setDebugBorderColor(color);
 }
 
 }  // namespace ui