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// Copyright (c) 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 "ui/gfx/compositor/layer.h"
#include <algorithm>
#include "base/logging.h"
namespace ui {
Layer::Layer(Compositor* compositor)
: compositor_(compositor),
texture_(compositor->CreateTexture()),
parent_(NULL),
fills_bounds_opaquely_(false) {
}
Layer::~Layer() {
if (parent_)
parent_->Remove(this);
for (size_t i = 0; i < children_.size(); ++i)
children_[i]->parent_ = NULL;
}
void Layer::Add(Layer* child) {
if (child->parent_)
child->parent_->Remove(child);
child->parent_ = this;
children_.push_back(child);
if (child->fills_bounds_opaquely())
RecomputeHole();
}
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;
if (child->fills_bounds_opaquely())
RecomputeHole();
}
void Layer::SetTransform(const ui::Transform& transform) {
transform_ = transform;
if (parent() && fills_bounds_opaquely_)
parent()->RecomputeHole();
}
void Layer::SetBounds(const gfx::Rect& bounds) {
bounds_ = bounds;
if (parent() && fills_bounds_opaquely_)
parent()->RecomputeHole();
}
void Layer::SetFillsBoundsOpaquely(bool fills_bounds_opaquely) {
if (fills_bounds_opaquely_ == fills_bounds_opaquely)
return;
fills_bounds_opaquely_ = fills_bounds_opaquely;
if (parent())
parent()->RecomputeHole();
}
void Layer::SetTexture(ui::Texture* texture) {
if (texture == NULL)
texture_ = compositor_->CreateTexture();
else
texture_ = texture;
}
void Layer::SetCanvas(const SkCanvas& canvas, const gfx::Point& origin) {
texture_->SetCanvas(canvas, origin, bounds_.size());
}
void Layer::Draw() {
ui::TextureDrawParams texture_draw_params;
for (Layer* layer = this; layer; layer = layer->parent_) {
texture_draw_params.transform.ConcatTransform(layer->transform_);
texture_draw_params.transform.ConcatTranslate(
static_cast<float>(layer->bounds_.x()),
static_cast<float>(layer->bounds_.y()));
}
// Only blend for child layers. The root layer will clobber the cleared bg.
texture_draw_params.blend = parent_ != NULL;
#if defined(OS_WIN)
texture_->Draw(texture_draw_params);
#else
hole_rect_ = hole_rect_.Intersect(
gfx::Rect(0, 0, bounds_.width(), bounds_.height()));
// top
DrawRegion(texture_draw_params, gfx::Rect(0,
0,
bounds_.width(),
hole_rect_.y()));
// left
DrawRegion(texture_draw_params, gfx::Rect(0,
hole_rect_.y(),
hole_rect_.x(),
hole_rect_.height()));
// right
DrawRegion(texture_draw_params, gfx::Rect(
hole_rect_.right(),
hole_rect_.y(),
bounds_.width() - hole_rect_.right(),
hole_rect_.height()));
// bottom
DrawRegion(texture_draw_params, gfx::Rect(
0,
hole_rect_.bottom(),
bounds_.width(),
bounds_.height() - hole_rect_.bottom()));
#endif
}
void Layer::DrawRegion(const ui::TextureDrawParams& params,
const gfx::Rect& region_to_draw) {
if (!region_to_draw.IsEmpty())
texture_->Draw(params, region_to_draw);
}
void Layer::RecomputeHole() {
for (size_t i = 0; i < children_.size(); ++i) {
if (children_[i]->fills_bounds_opaquely() &&
!children_[i]->transform().HasChange()) {
hole_rect_ = children_[i]->bounds();
return;
}
}
// no opaque child layers, set hole_rect_ to empty
hole_rect_ = gfx::Rect();
}
} // namespace ui
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