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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"
#include "ui/gfx/compositor/compositor.h"
namespace ui {
Layer::Layer(Compositor* compositor)
: compositor_(compositor),
texture_(compositor->CreateTexture()),
parent_(NULL) {
}
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);
}
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;
}
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;
texture_->Draw(texture_draw_params);
}
} // namespace ui
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