| 1 | // Copyright 2013 The Flutter Authors. All rights reserved. |
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| 2 | // Use of this source code is governed by a BSD-style license that can be |
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| 3 | // found in the LICENSE file. |
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| 4 | |
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| 5 | #include "flutter/flow/layers/layer.h" |
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| 6 | |
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| 7 | #include "flutter/flow/paint_utils.h" |
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| 8 | |
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| 9 | namespace flutter { |
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| 10 | |
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| 11 | Layer::Layer() |
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| 12 | : paint_bounds_(SkRect::MakeEmpty()), |
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| 13 | unique_id_(NextUniqueID()), |
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| 14 | original_layer_id_(unique_id_), |
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| 15 | subtree_has_platform_view_(false) {} |
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| 16 | |
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| 17 | Layer::~Layer() = default; |
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| 18 | |
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| 19 | uint64_t Layer::NextUniqueID() { |
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| 20 | static std::atomic<uint64_t> next_id(1); |
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| 21 | uint64_t id; |
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| 22 | do { |
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| 23 | id = next_id.fetch_add(op: 1); |
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| 24 | } while (id == 0); // 0 is reserved for an invalid id. |
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| 25 | return id; |
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| 26 | } |
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| 27 | |
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| 28 | Layer::AutoPrerollSaveLayerState::AutoPrerollSaveLayerState( |
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| 29 | PrerollContext* preroll_context, |
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| 30 | bool save_layer_is_active, |
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| 31 | bool layer_itself_performs_readback) |
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| 32 | : preroll_context_(preroll_context), |
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| 33 | save_layer_is_active_(save_layer_is_active), |
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| 34 | layer_itself_performs_readback_(layer_itself_performs_readback) { |
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| 35 | if (save_layer_is_active_) { |
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| 36 | prev_surface_needs_readback_ = preroll_context_->surface_needs_readback; |
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| 37 | preroll_context_->surface_needs_readback = false; |
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| 38 | } |
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| 39 | } |
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| 40 | |
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| 41 | Layer::AutoPrerollSaveLayerState Layer::AutoPrerollSaveLayerState::Create( |
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| 42 | PrerollContext* preroll_context, |
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| 43 | bool save_layer_is_active, |
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| 44 | bool layer_itself_performs_readback) { |
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| 45 | return Layer::AutoPrerollSaveLayerState(preroll_context, save_layer_is_active, |
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| 46 | layer_itself_performs_readback); |
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| 47 | } |
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| 48 | |
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| 49 | Layer::AutoPrerollSaveLayerState::~AutoPrerollSaveLayerState() { |
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| 50 | if (save_layer_is_active_) { |
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| 51 | preroll_context_->surface_needs_readback = |
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| 52 | (prev_surface_needs_readback_ || layer_itself_performs_readback_); |
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| 53 | } |
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| 54 | } |
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| 55 | |
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| 56 | } // namespace flutter |
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| 57 | |
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