| // 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/layers/layer.h" |
| |
| #include "flutter/flow/paint_utils.h" |
| #include "third_party/skia/include/core/SkColorFilter.h" |
| |
| namespace flutter { |
| |
| Layer::Layer() |
| : paint_bounds_(SkRect::MakeEmpty()), |
| unique_id_(NextUniqueID()), |
| needs_system_composite_(false) {} |
| |
| Layer::~Layer() = default; |
| |
| uint64_t Layer::NextUniqueID() { |
| static std::atomic<uint64_t> nextID(1); |
| uint64_t id; |
| do { |
| id = nextID.fetch_add(1); |
| } while (id == 0); // 0 is reserved for an invalid id. |
| return id; |
| } |
| |
| void Layer::Preroll(PrerollContext* context, const SkMatrix& matrix) {} |
| |
| Layer::AutoPrerollSaveLayerState::AutoPrerollSaveLayerState( |
| PrerollContext* preroll_context, |
| bool save_layer_is_active, |
| bool layer_itself_performs_readback) |
| : preroll_context_(preroll_context), |
| save_layer_is_active_(save_layer_is_active), |
| layer_itself_performs_readback_(layer_itself_performs_readback) { |
| if (save_layer_is_active_) { |
| prev_surface_needs_readback_ = preroll_context_->surface_needs_readback; |
| preroll_context_->surface_needs_readback = false; |
| } |
| } |
| |
| Layer::AutoPrerollSaveLayerState Layer::AutoPrerollSaveLayerState::Create( |
| PrerollContext* preroll_context, |
| bool save_layer_is_active, |
| bool layer_itself_performs_readback) { |
| return Layer::AutoPrerollSaveLayerState(preroll_context, save_layer_is_active, |
| layer_itself_performs_readback); |
| } |
| |
| Layer::AutoPrerollSaveLayerState::~AutoPrerollSaveLayerState() { |
| if (save_layer_is_active_) { |
| preroll_context_->surface_needs_readback = |
| (prev_surface_needs_readback_ || layer_itself_performs_readback_); |
| } |
| } |
| |
| #if defined(OS_FUCHSIA) |
| void Layer::UpdateScene(SceneUpdateContext& context) {} |
| #endif // defined(OS_FUCHSIA) |
| |
| Layer::AutoSaveLayer::AutoSaveLayer(const PaintContext& paint_context, |
| const SkRect& bounds, |
| const SkPaint* paint) |
| : paint_context_(paint_context), bounds_(bounds) { |
| paint_context_.internal_nodes_canvas->saveLayer(bounds_, paint); |
| } |
| |
| Layer::AutoSaveLayer::AutoSaveLayer(const PaintContext& paint_context, |
| const SkCanvas::SaveLayerRec& layer_rec) |
| : paint_context_(paint_context), bounds_(*layer_rec.fBounds) { |
| paint_context_.internal_nodes_canvas->saveLayer(layer_rec); |
| } |
| |
| Layer::AutoSaveLayer Layer::AutoSaveLayer::Create( |
| const PaintContext& paint_context, |
| const SkRect& bounds, |
| const SkPaint* paint) { |
| return Layer::AutoSaveLayer(paint_context, bounds, paint); |
| } |
| |
| Layer::AutoSaveLayer Layer::AutoSaveLayer::Create( |
| const PaintContext& paint_context, |
| const SkCanvas::SaveLayerRec& layer_rec) { |
| return Layer::AutoSaveLayer(paint_context, layer_rec); |
| } |
| |
| Layer::AutoSaveLayer::~AutoSaveLayer() { |
| if (paint_context_.checkerboard_offscreen_layers) { |
| DrawCheckerboard(paint_context_.internal_nodes_canvas, bounds_); |
| } |
| paint_context_.internal_nodes_canvas->restore(); |
| } |
| |
| } // namespace flutter |