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// Copyright 2015 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_TESTING_SIM_SIM_COMPOSITOR_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_TESTING_SIM_SIM_COMPOSITOR_H_
#include "base/time/time.h"
#include "cc/trees/layer_tree_host.h"
#include "content/renderer/gpu/layer_tree_view.h"
#include "content/test/stub_layer_tree_view_delegate.h"
#include "third_party/blink/renderer/core/frame/frame_test_helpers.h"
#include "third_party/blink/renderer/core/testing/sim/sim_canvas.h"
namespace blink {
class WebViewImpl;
// Simulated very basic compositor that's capable of running the BeginMainFrame
// processing steps on WebView: beginFrame, layout, paint.
//
// The painting capabilities are very limited in that only the main layer of
// every CompositedLayerMapping will be painted, squashed layers
// are not supported and the entirety of every layer is always repainted even if
// only part of the layer was invalid.
//
// Note: This also does not support compositor driven animations.
class SimCompositor final : public content::StubLayerTreeViewDelegate {
public:
explicit SimCompositor();
~SimCompositor() override;
// This compositor should be given to the WebViewImpl passed to SetWebView.
content::LayerTreeView& layer_tree_view() { return *layer_tree_view_; }
// When the compositor asks for a main frame, this WebViewImpl will have its
// lifecycle updated and be painted. The compositor() should have also been
// given to the WebViewImpl so that its using the same compositor() for its
// layer tree.
void SetWebView(WebViewImpl&);
// Executes the BeginMainFrame processing steps, an approximation of what
// cc::ThreadProxy::BeginMainFrame would do.
// If time is not specified a 60Hz frame rate time progression is used.
// Returns all drawing commands that were issued during painting the frame
// (including cached ones).
// TODO(dcheng): This should take a base::TimeDelta.
SimCanvas::Commands BeginFrame(double time_delta_in_seconds = 0.016);
// Similar to BeginFrame() but doesn't require NeedsBeginFrame(). This is
// useful for testing the painting after a frame is throttled (for which
// we don't schedule a BeginFrame).
SimCanvas::Commands PaintFrame();
// Helpers to query the state of the compositor from tests.
//
// Returns true if a main frame has been requested from blink, until the
// BeginFrame() step occurs.
bool NeedsBeginFrame() const {
return layer_tree_view_->layer_tree_host()->RequestedMainFramePending();
}
// Returns true if commits are deferred in the compositor. Since these tests
// use synchronous compositing through BeginFrame(), the deferred state has no
// real effect.
bool DeferCommits() const {
return layer_tree_view_->layer_tree_host()->defer_commits();
}
// Returns true if a selection is set on the compositor.
bool HasSelection() const {
return layer_tree_view_->layer_tree_host()->selection() !=
cc::LayerSelection();
}
// Returns the background color set on the compositor.
SkColor background_color() {
return layer_tree_view_->layer_tree_host()->background_color();
}
private:
// content::LayerTreeViewDelegate implementation.
void RequestNewLayerTreeFrameSink(
LayerTreeFrameSinkCallback callback) override;
void BeginMainFrame(base::TimeTicks frame_time) override;
WebViewImpl* web_view_ = nullptr;
base::TimeTicks last_frame_time_;
// During BeginFrame(), painting is done, and the result is stored here to
// be returned from BeginFrame().
SimCanvas::Commands* paint_commands_;
content::LayerTreeView* layer_tree_view_ = nullptr;
FrameTestHelpers::LayerTreeViewFactory layer_tree_view_factory_;
};
} // namespace blink
#endif
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