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compositor_context.cc
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compositor_context.cc
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// Copyright 2013 The Flutter 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 "flutter/flow/compositor_context.h"
#include "flutter/flow/layers/layer_tree.h"
#include "third_party/skia/include/core/SkCanvas.h"
namespace flow {
CompositorContext::CompositorContext() = default;
CompositorContext::~CompositorContext() = default;
void CompositorContext::BeginFrame(ScopedFrame& frame,
bool enable_instrumentation) {
if (enable_instrumentation) {
frame_count_.Increment();
frame_time_.Start();
}
}
void CompositorContext::EndFrame(ScopedFrame& frame,
bool enable_instrumentation) {
raster_cache_.SweepAfterFrame();
if (enable_instrumentation) {
frame_time_.Stop();
}
}
std::unique_ptr<CompositorContext::ScopedFrame> CompositorContext::AcquireFrame(
GrContext* gr_context,
SkCanvas* canvas,
ExternalViewEmbedder* view_embedder,
const SkMatrix& root_surface_transformation,
bool instrumentation_enabled) {
return std::make_unique<ScopedFrame>(*this, gr_context, canvas, view_embedder,
root_surface_transformation,
instrumentation_enabled);
}
CompositorContext::ScopedFrame::ScopedFrame(
CompositorContext& context,
GrContext* gr_context,
SkCanvas* canvas,
ExternalViewEmbedder* view_embedder,
const SkMatrix& root_surface_transformation,
bool instrumentation_enabled)
: context_(context),
gr_context_(gr_context),
canvas_(canvas),
view_embedder_(view_embedder),
root_surface_transformation_(root_surface_transformation),
instrumentation_enabled_(instrumentation_enabled) {
context_.BeginFrame(*this, instrumentation_enabled_);
}
CompositorContext::ScopedFrame::~ScopedFrame() {
context_.EndFrame(*this, instrumentation_enabled_);
}
bool CompositorContext::ScopedFrame::Raster(flow::LayerTree& layer_tree,
bool ignore_raster_cache) {
layer_tree.Preroll(*this, ignore_raster_cache);
// Clearing canvas after preroll reduces one render target switch when preroll
// paints some raster cache.
if (canvas()) {
canvas()->clear(SK_ColorTRANSPARENT);
}
layer_tree.Paint(*this, ignore_raster_cache);
return true;
}
void CompositorContext::OnGrContextCreated() {
texture_registry_.OnGrContextCreated();
raster_cache_.Clear();
}
void CompositorContext::OnGrContextDestroyed() {
texture_registry_.OnGrContextDestroyed();
raster_cache_.Clear();
}
} // namespace flow