mirror of
https://github.com/encounter/engine.git
synced 2026-03-30 11:09:55 -07:00
Jim Graham
85953615eb
Currently helps primarily on iOS when no BackdropFilter is present by lowering energy usage
96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flutter/flow/layers/layer.h"
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#include "flutter/flow/paint_utils.h"
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#include "third_party/skia/include/core/SkColorFilter.h"
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namespace flutter {
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Layer::Layer()
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: paint_bounds_(SkRect::MakeEmpty()),
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unique_id_(NextUniqueID()),
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needs_system_composite_(false) {}
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Layer::~Layer() = default;
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uint64_t Layer::NextUniqueID() {
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static std::atomic<uint64_t> nextID(1);
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uint64_t id;
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do {
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id = nextID.fetch_add(1);
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} while (id == 0); // 0 is reserved for an invalid id.
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return id;
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}
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void Layer::Preroll(PrerollContext* context, const SkMatrix& matrix) {}
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Layer::AutoPrerollSaveLayerState::AutoPrerollSaveLayerState(
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PrerollContext* preroll_context,
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bool save_layer_is_active,
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bool layer_itself_performs_readback)
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: preroll_context_(preroll_context),
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save_layer_is_active_(save_layer_is_active),
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layer_itself_performs_readback_(layer_itself_performs_readback) {
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if (save_layer_is_active_) {
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prev_surface_needs_readback_ = preroll_context_->surface_needs_readback;
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preroll_context_->surface_needs_readback = false;
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}
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}
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Layer::AutoPrerollSaveLayerState Layer::AutoPrerollSaveLayerState::Create(
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PrerollContext* preroll_context,
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bool save_layer_is_active,
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bool layer_itself_performs_readback) {
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return Layer::AutoPrerollSaveLayerState(preroll_context, save_layer_is_active,
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layer_itself_performs_readback);
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}
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Layer::AutoPrerollSaveLayerState::~AutoPrerollSaveLayerState() {
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if (save_layer_is_active_) {
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preroll_context_->surface_needs_readback =
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(prev_surface_needs_readback_ || layer_itself_performs_readback_);
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}
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}
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#if defined(OS_FUCHSIA)
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void Layer::UpdateScene(SceneUpdateContext& context) {}
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#endif // defined(OS_FUCHSIA)
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Layer::AutoSaveLayer::AutoSaveLayer(const PaintContext& paint_context,
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const SkRect& bounds,
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const SkPaint* paint)
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: paint_context_(paint_context), bounds_(bounds) {
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paint_context_.internal_nodes_canvas->saveLayer(bounds_, paint);
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}
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Layer::AutoSaveLayer::AutoSaveLayer(const PaintContext& paint_context,
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const SkCanvas::SaveLayerRec& layer_rec)
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: paint_context_(paint_context), bounds_(*layer_rec.fBounds) {
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paint_context_.internal_nodes_canvas->saveLayer(layer_rec);
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}
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Layer::AutoSaveLayer Layer::AutoSaveLayer::Create(
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const PaintContext& paint_context,
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const SkRect& bounds,
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const SkPaint* paint) {
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return Layer::AutoSaveLayer(paint_context, bounds, paint);
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}
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Layer::AutoSaveLayer Layer::AutoSaveLayer::Create(
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const PaintContext& paint_context,
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const SkCanvas::SaveLayerRec& layer_rec) {
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return Layer::AutoSaveLayer(paint_context, layer_rec);
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}
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Layer::AutoSaveLayer::~AutoSaveLayer() {
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if (paint_context_.checkerboard_offscreen_layers) {
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DrawCheckerboard(paint_context_.internal_nodes_canvas, bounds_);
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}
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paint_context_.internal_nodes_canvas->restore();
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}
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} // namespace flutter
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