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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 <cstdint>
#include <memory>
#include "flutter/flow/compositor_context.h"
#include "flutter/flow/layers/layer.h"
#include "flutter/fml/macros.h"
#include "flutter/fml/time/time_delta.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "third_party/skia/include/core/SkSize.h"
namespace flutter {
class LayerTree {
LayerTree(const SkISize& frame_size, float device_pixel_ratio);
// Perform a preroll pass on the tree and return information about
// the tree that affects rendering this frame.
// Returns:
// - a boolean indicating whether or not the top level of the
// layer tree performs any operations that require readback
// from the root surface.
bool Preroll(CompositorContext::ScopedFrame& frame,
bool ignore_raster_cache = false);
void Paint(CompositorContext::ScopedFrame& frame,
bool ignore_raster_cache = false) const;
sk_sp<SkPicture> Flatten(const SkRect& bounds);
Layer* root_layer() const { return root_layer_.get(); }
void set_root_layer(std::shared_ptr<Layer> root_layer) {
root_layer_ = std::move(root_layer);
const SkISize& frame_size() const { return frame_size_; }
float device_pixel_ratio() const { return device_pixel_ratio_; }
const PaintRegionMap& paint_region_map() const { return paint_region_map_; }
PaintRegionMap& paint_region_map() { return paint_region_map_; }
// The number of frame intervals missed after which the compositor must
// trace the rasterized picture to a trace file. Specify 0 to disable all
// tracing
void set_rasterizer_tracing_threshold(uint32_t interval) {
rasterizer_tracing_threshold_ = interval;
uint32_t rasterizer_tracing_threshold() const {
return rasterizer_tracing_threshold_;
void set_checkerboard_raster_cache_images(bool checkerboard) {
checkerboard_raster_cache_images_ = checkerboard;
void set_checkerboard_offscreen_layers(bool checkerboard) {
checkerboard_offscreen_layers_ = checkerboard;
std::shared_ptr<Layer> root_layer_;
SkISize frame_size_ = SkISize::MakeEmpty(); // Physical pixels.
const float device_pixel_ratio_; // Logical / Physical pixels ratio.
uint32_t rasterizer_tracing_threshold_;
bool checkerboard_raster_cache_images_;
bool checkerboard_offscreen_layers_;
PaintRegionMap paint_region_map_;
} // namespace flutter