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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 <optional>
#include "flutter/flow/layers/layer_tree.h"
#include "third_party/skia/include/core/SkCanvas.h"
namespace flutter {
std::optional<SkRect> FrameDamage::ComputeClipRect(
flutter::LayerTree& layer_tree) {
if (layer_tree.root_layer()) {
PaintRegionMap empty_paint_region_map;
DiffContext context(layer_tree.frame_size(),
layer_tree.device_pixel_ratio(),
layer_tree.paint_region_map(),
prev_layer_tree_ ? prev_layer_tree_->paint_region_map()
: empty_paint_region_map);
context.PushCullRect(SkRect::MakeIWH(layer_tree.frame_size().width(),
layer_tree.frame_size().height()));
{
DiffContext::AutoSubtreeRestore subtree(&context);
const Layer* prev_root_layer = nullptr;
if (!prev_layer_tree_ ||
prev_layer_tree_->frame_size() != layer_tree.frame_size()) {
// If there is no previous layer tree assume the entire frame must be
// repainted.
context.MarkSubtreeDirty(SkRect::MakeIWH(
layer_tree.frame_size().width(), layer_tree.frame_size().height()));
} else {
prev_root_layer = prev_layer_tree_->root_layer();
}
layer_tree.root_layer()->Diff(&context, prev_root_layer);
}
damage_ =
context.ComputeDamage(additional_damage_, horizontal_clip_alignment_,
vertical_clip_alignment_);
return SkRect::Make(damage_->buffer_damage);
} else {
return std::nullopt;
}
}
CompositorContext::CompositorContext()
: texture_registry_(std::make_shared<TextureRegistry>()),
raster_time_(fixed_refresh_rate_updater_),
ui_time_(fixed_refresh_rate_updater_) {}
CompositorContext::CompositorContext(Stopwatch::RefreshRateUpdater& updater)
: texture_registry_(std::make_shared<TextureRegistry>()),
raster_time_(updater),
ui_time_(updater) {}
CompositorContext::~CompositorContext() = default;
void CompositorContext::BeginFrame(ScopedFrame& frame,
bool enable_instrumentation) {
if (enable_instrumentation) {
raster_time_.Start();
}
}
void CompositorContext::EndFrame(ScopedFrame& frame,
bool enable_instrumentation) {
if (enable_instrumentation) {
raster_time_.Stop();
}
}
std::unique_ptr<CompositorContext::ScopedFrame> CompositorContext::AcquireFrame(
GrDirectContext* gr_context,
SkCanvas* canvas,
ExternalViewEmbedder* view_embedder,
const SkMatrix& root_surface_transformation,
bool instrumentation_enabled,
bool surface_supports_readback,
fml::RefPtr<fml::RasterThreadMerger> raster_thread_merger,
DisplayListBuilder* display_list_builder) {
return std::make_unique<ScopedFrame>(
*this, gr_context, canvas, view_embedder, root_surface_transformation,
instrumentation_enabled, surface_supports_readback, raster_thread_merger,
display_list_builder);
}
CompositorContext::ScopedFrame::ScopedFrame(
CompositorContext& context,
GrDirectContext* gr_context,
SkCanvas* canvas,
ExternalViewEmbedder* view_embedder,
const SkMatrix& root_surface_transformation,
bool instrumentation_enabled,
bool surface_supports_readback,
fml::RefPtr<fml::RasterThreadMerger> raster_thread_merger,
DisplayListBuilder* display_list_builder)
: context_(context),
gr_context_(gr_context),
canvas_(canvas),
display_list_builder_(display_list_builder),
view_embedder_(view_embedder),
root_surface_transformation_(root_surface_transformation),
instrumentation_enabled_(instrumentation_enabled),
surface_supports_readback_(surface_supports_readback),
raster_thread_merger_(raster_thread_merger) {
context_.BeginFrame(*this, instrumentation_enabled_);
}
CompositorContext::ScopedFrame::~ScopedFrame() {
context_.EndFrame(*this, instrumentation_enabled_);
}
RasterStatus CompositorContext::ScopedFrame::Raster(
flutter::LayerTree& layer_tree,
bool ignore_raster_cache,
FrameDamage* frame_damage) {
TRACE_EVENT0("flutter", "CompositorContext::ScopedFrame::Raster");
std::optional<SkRect> clip_rect =
frame_damage ? frame_damage->ComputeClipRect(layer_tree) : std::nullopt;
bool root_needs_readback = layer_tree.Preroll(
*this, ignore_raster_cache, clip_rect ? *clip_rect : kGiantRect);
bool needs_save_layer = root_needs_readback && !surface_supports_readback();
PostPrerollResult post_preroll_result = PostPrerollResult::kSuccess;
if (view_embedder_ && raster_thread_merger_) {
post_preroll_result =
view_embedder_->PostPrerollAction(raster_thread_merger_);
}
if (post_preroll_result == PostPrerollResult::kResubmitFrame) {
return RasterStatus::kResubmit;
}
if (post_preroll_result == PostPrerollResult::kSkipAndRetryFrame) {
return RasterStatus::kSkipAndRetry;
}
SkAutoCanvasRestore restore(canvas(), clip_rect.has_value());
// Clearing canvas after preroll reduces one render target switch when preroll
// paints some raster cache.
if (canvas()) {
if (clip_rect) {
canvas()->clipRect(*clip_rect);
}
if (needs_save_layer) {
TRACE_EVENT0("flutter", "Canvas::saveLayer");
SkRect bounds = SkRect::Make(layer_tree.frame_size());
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
canvas()->saveLayer(&bounds, &paint);
}
canvas()->clear(SK_ColorTRANSPARENT);
}
layer_tree.Paint(*this, ignore_raster_cache);
if (canvas() && needs_save_layer) {
canvas()->restore();
}
return RasterStatus::kSuccess;
}
void CompositorContext::OnGrContextCreated() {
texture_registry_->OnGrContextCreated();
raster_cache_.Clear();
}
void CompositorContext::OnGrContextDestroyed() {
texture_registry_->OnGrContextDestroyed();
raster_cache_.Clear();
}
} // namespace flutter