blob: d673bf0f383b52d96d2abf7ddb832acb3e472122 [file] [log] [blame]
// 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"
namespace flutter {
Layer::Layer()
: paint_bounds_(SkRect::MakeEmpty()),
unique_id_(NextUniqueID()),
original_layer_id_(unique_id_) {}
Layer::~Layer() = default;
uint64_t Layer::NextUniqueID() {
static std::atomic<uint64_t> next_id(1);
uint64_t id;
do {
id = next_id.fetch_add(1);
} while (id == 0); // 0 is reserved for an invalid id.
return id;
}
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_);
}
}
} // namespace flutter