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// Copyright 2014 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 "content/browser/compositor/browser_compositor_view_mac.h"
#include "base/debug/trace_event.h"
#include "base/lazy_instance.h"
#include "content/browser/gpu/gpu_process_host_ui_shim.h"
#include "content/browser/compositor/browser_compositor_ca_layer_tree_mac.h"
#include "content/common/gpu/gpu_messages.h"
////////////////////////////////////////////////////////////////////////////////
// BrowserCompositorViewMac
namespace content {
namespace {
// The number of placeholder objects allocated. If this reaches zero, then
// the BrowserCompositorCALayerTreeMac being held on to for recycling,
// |g_recyclable_ca_layer_tree|, will be freed.
uint32 g_placeholder_count = 0;
// A spare BrowserCompositorCALayerTreeMac kept around for recycling.
base::LazyInstance<scoped_ptr<BrowserCompositorCALayerTreeMac>>
g_recyclable_ca_layer_tree;
} // namespace
BrowserCompositorViewMac::BrowserCompositorViewMac(
BrowserCompositorViewMacClient* client,
NSView* native_view,
ui::Layer* ui_root_layer)
: client_(client),
native_view_(native_view),
ui_root_layer_(ui_root_layer) {
// Try to use the recyclable BrowserCompositorCALayerTreeMac if there is one,
// otherwise allocate a new one.
// TODO(ccameron): If there exists a frame in flight (swap has been called
// by the compositor, but the frame has not arrived from the GPU process
// yet), then that frame may inappropriately flash in the new view.
ca_layer_tree_ = g_recyclable_ca_layer_tree.Get().Pass();
if (!ca_layer_tree_)
ca_layer_tree_.reset(new BrowserCompositorCALayerTreeMac);
ca_layer_tree_->SetView(this);
}
BrowserCompositorViewMac::~BrowserCompositorViewMac() {
// Make this BrowserCompositorCALayerTreeMac recyclable for future instances.
ca_layer_tree_->ResetView();
g_recyclable_ca_layer_tree.Get() = ca_layer_tree_.Pass();
// If there are no placeholders allocated, destroy the recyclable
// BrowserCompositorCALayerTreeMac that we just populated.
if (!g_placeholder_count)
g_recyclable_ca_layer_tree.Get().reset();
}
ui::Compositor* BrowserCompositorViewMac::GetCompositor() const {
DCHECK(ca_layer_tree_);
return ca_layer_tree_->compositor();
}
bool BrowserCompositorViewMac::HasFrameOfSize(
const gfx::Size& dip_size) const {
if (ca_layer_tree_)
return ca_layer_tree_->HasFrameOfSize(dip_size);
return false;
}
void BrowserCompositorViewMac::BeginPumpingFrames() {
if (ca_layer_tree_)
ca_layer_tree_->BeginPumpingFrames();
}
void BrowserCompositorViewMac::EndPumpingFrames() {
if (ca_layer_tree_)
ca_layer_tree_->EndPumpingFrames();
}
////////////////////////////////////////////////////////////////////////////////
// BrowserCompositorViewPlaceholderMac
BrowserCompositorViewPlaceholderMac::BrowserCompositorViewPlaceholderMac() {
g_placeholder_count += 1;
}
BrowserCompositorViewPlaceholderMac::~BrowserCompositorViewPlaceholderMac() {
DCHECK_GT(g_placeholder_count, 0u);
g_placeholder_count -= 1;
// If there are no placeholders allocated, destroy the recyclable
// BrowserCompositorCALayerTreeMac.
if (!g_placeholder_count)
g_recyclable_ca_layer_tree.Get().reset();
}
} // namespace content
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