06c9e2962b
This reverts commit 0d174586c4.
Use SkTLazy instead of std::optional (C++17 library feature)
Bug: skia:11900
Change-Id: Ia41caa9322d812f9ba6644dd14ede7d0015cf8b3
Cq-Include-Trybots: luci.skia.skia.primary:Housekeeper-PerCommit-CreateDockerImage_Skia_Release,Build-Debian10-Clang-x86_64-Release-CMake
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/402642
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
103 lines
3.5 KiB
C++
103 lines
3.5 KiB
C++
/*
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* Copyright 2021 Google LLC
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*
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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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*/
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#ifndef MSKPPlayer_DEFINED
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#define MSKPPlayer_DEFINED
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkSize.h"
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#include <unordered_map>
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#include <vector>
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class SkCanvas;
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class SkStreamSeekable;
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class SkSurface;
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/**
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* Plays frames/pages of a MSKP to a canvas. This class uses the term "frame" as though the MSKP
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* contains an animation, though it could indeed contain pages of a static document.
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*/
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class MSKPPlayer {
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public:
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~MSKPPlayer();
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/** Make a player from a MSKP stream, or null if stream can't be read as MSKP. */
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static std::unique_ptr<MSKPPlayer> Make(SkStreamSeekable* stream);
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/** Maximum width and height across all frames. */
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SkISize maxDimensions() const { return fMaxDimensions; }
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/** Total number of frames. */
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int numFrames() const { return static_cast<int>(fRootLayers.size()); }
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/** Size of an individual frame. */
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SkISize frameDimensions(int i) const;
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/**
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* Plays a frame into the passed canvas. Frames can be randomly accessed. Offscreen layers are
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* incrementally updated from their current state to the state required for the frame
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* (redrawing from scratch if their current state is ahead of the passed frame index).
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*/
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bool playFrame(SkCanvas* canvas, int i);
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/** Destroys any cached offscreen layers. */
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void resetLayers();
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private:
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MSKPPlayer() = default;
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// noncopyable, nonmoveable.
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MSKPPlayer(const MSKPPlayer&) = delete;
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MSKPPlayer(MSKPPlayer&&) = delete;
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MSKPPlayer& operator=(const MSKPPlayer&) = delete;
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MSKPPlayer& operator=(MSKPPlayer&&) = delete;
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// Cmds are used to draw content to the frame root layer and to offscreen layers.
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struct Cmd;
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// Draws a SkPicture.
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struct PicCmd;
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// Draws another layer. Stores the ID of the layer to draw and what command index on that
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// layer should be current when the layer is drawn. The layer contents are updated to the
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// stored command index before the layer is drawn.
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struct DrawLayerCmd;
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// The commands for a root/offscreen layer and dimensions of the layer.
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struct Layer {
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Layer() = default;
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Layer(Layer&&) = default;
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SkISize fDimensions;
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std::vector<std::unique_ptr<Cmd>> fCmds;
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};
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// Playback state of layer: the last command index drawn to it and the SkSurface with contents.
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struct LayerState {
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size_t fCurrCmd = -1;
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sk_sp<SkSurface> fSurface;
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};
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// MSKP layer ID -> Layer
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using LayerMap = std::unordered_map<int, Layer>;
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// MSKP layer ID -> LayerState
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using LayerStateMap = std::unordered_map<int, LayerState>;
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/**
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* A SkCanvas that consumes the SkPicture and records Cmds into a Layer. It will spawn
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* additional Layers and record nested SkPictures into those using additional CmdRecordCanvas
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* CmdRecordCanvas instances. It needs access to fOffscreenLayers to create and update Layer
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* structs for offscreen layers.
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*/
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class CmdRecordCanvas;
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SkISize fMaxDimensions = {0, 0}; // Max dimensions across all frames.
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LayerMap fOffscreenLayers; // All the offscreen layers for all frames.
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LayerStateMap fOffscreenLayerStates; // Current surfaces and command idx for offscreen
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// layers
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std::vector<Layer> fRootLayers; // One root layer for each frame.
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};
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#endif
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