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/*
* Copyright 2021 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "tools/MSKPPlayer.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkCanvasVirtualEnforcer.h"
#include "include/core/SkPicture.h"
#include "include/core/SkPictureRecorder.h"
#include "include/core/SkSurface.h"
#include "include/gpu/GrDirectContext.h"
#include "include/private/SkTArray.h"
#include "include/utils/SkNoDrawCanvas.h"
#include "src/core/SkCanvasPriv.h"
#include "src/core/SkTLazy.h"
#include "src/utils/SkMultiPictureDocument.h"
#include "tools/SkSharingProc.h"
///////////////////////////////////////////////////////////////////////////////
// Base Cmd struct.
struct MSKPPlayer::Cmd {
virtual ~Cmd() = default;
virtual bool isFullRedraw(SkCanvas*) const = 0;
virtual void draw(SkCanvas* canvas, const LayerMap&, LayerStateMap*) const = 0;
// If this command draws another layer, return it's ID. Otherwise, -1.
virtual int layerID() const { return -1; }
};
// Draws a SkPicture.
struct MSKPPlayer::PicCmd : Cmd {
sk_sp<SkPicture> fContent;
SkIRect fClipRect = SkIRect::MakeEmpty(); // clip for picture (no clip if empty).
bool isFullRedraw(SkCanvas* canvas) const override {
if (fClipRect.isEmpty()) {
return false;
}
return fClipRect.contains(SkIRect::MakeSize(canvas->getBaseLayerSize()));
}
void draw(SkCanvas* canvas, const LayerMap&, LayerStateMap*) const override {
if (!fClipRect.isEmpty()) {
canvas->save();
canvas->clipIRect(fClipRect);
}
canvas->drawPicture(fContent.get());
if (!fClipRect.isEmpty()) {
canvas->restore();
}
}
};
// Draws another layer. Stores the ID of the layer to draw and what command index on that
// layer should be current when the layer is drawn. The layer contents are updated to the
// stored command index before the layer is drawn.
struct MSKPPlayer::DrawLayerCmd : Cmd {
int fLayerId;
size_t fLayerCmdCnt;
SkRect fSrcRect;
SkRect fDstRect;
SkSamplingOptions fSampling;
SkCanvas::SrcRectConstraint fConstraint;
SkTLazy<SkPaint> fPaint;
bool isFullRedraw(SkCanvas* canvas) const override { return false; }
void draw(SkCanvas* canvas, const LayerMap&, LayerStateMap*) const override;
int layerID() const override { return fLayerId; }
};
void MSKPPlayer::DrawLayerCmd::draw(SkCanvas* canvas,
const LayerMap& layerMap,
LayerStateMap* layerStateMap) const {
const LayerCmds& layer = layerMap.at(fLayerId);
LayerState* layerState = &(*layerStateMap)[fLayerId];
if (!layerState->fSurface) {
layerState->fCurrCmd = 0;
layerState->fSurface = MSKPPlayer::MakeSurfaceForLayer(layer, canvas);
if (!layerState->fSurface) {
SkDebugf("Couldn't create surface for layer");
return;
}
}
size_t cmd = layerState->fCurrCmd;
if (cmd > fLayerCmdCnt) {
// If the layer contains contents from later commands then replay from the beginning.
cmd = 0;
}
SkCanvas* layerCanvas = layerState->fSurface->getCanvas();
// Check if there is a full redraw between cmd and fLayerCmdCnt and if so jump to it and ensure
// we clear the canvas if starting from a full redraw.
for (size_t checkCmd = fLayerCmdCnt - 1; checkCmd > cmd; --checkCmd) {
if (layer.fCmds[checkCmd]->isFullRedraw(layerCanvas)) {
cmd = checkCmd;
break;
}
}
for (; cmd < fLayerCmdCnt; ++cmd) {
if (cmd == 0 || layer.fCmds[cmd]->isFullRedraw(layerCanvas)) {
layerState->fSurface->getCanvas()->clear(SK_ColorTRANSPARENT);
}
layer.fCmds[cmd]->draw(layerCanvas, layerMap, layerStateMap);
}
layerState->fCurrCmd = fLayerCmdCnt;
const SkPaint* paint = fPaint.isValid() ? fPaint.get() : nullptr;
canvas->drawImageRect(layerState->fSurface->makeImageSnapshot(),
fSrcRect,
fDstRect,
fSampling,
paint,
fConstraint);
}
///////////////////////////////////////////////////////////////////////////////
class MSKPPlayer::CmdRecordCanvas : public SkCanvasVirtualEnforcer<SkCanvas> {
public:
CmdRecordCanvas(LayerCmds* dst, LayerMap* offscreenLayers, const SkIRect* clipRect = nullptr)
: fDst(dst), fOffscreenLayers(offscreenLayers) {
if (clipRect) {
fClipRect = *clipRect;
}
fRecorder.beginRecording(SkRect::Make(dst->fDimensions));
}
~CmdRecordCanvas() override { this->recordPicCmd(); }
protected:
void onDrawPaint(const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawPaint(paint);
}
void onDrawBehind(const SkPaint& paint) override {
SkCanvasPriv::DrawBehind(fRecorder.getRecordingCanvas(), paint);
}
void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawRect(rect, paint);
}
void onDrawRRect(const SkRRect& rrect, const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawRRect(rrect, paint);
}
void onDrawDRRect(const SkRRect& outer, const SkRRect& inner, const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawDRRect(outer, inner, paint);
}
void onDrawOval(const SkRect& rect, const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawOval(rect, paint);
}
void onDrawArc(const SkRect& rect,
SkScalar startAngle,
SkScalar sweepAngle,
bool useCenter,
const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawArc(rect, startAngle, sweepAngle, useCenter, paint);
}
void onDrawPath(const SkPath& path, const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawPath(path, paint);
}
void onDrawRegion(const SkRegion& region, const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawRegion(region, paint);
}
void onDrawTextBlob(const SkTextBlob* blob,
SkScalar x,
SkScalar y,
const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawTextBlob(blob, x, y, paint);
}
void onDrawPatch(const SkPoint cubics[12],
const SkColor colors[4],
const SkPoint texCoords[4],
SkBlendMode mode,
const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawPatch(cubics, colors, texCoords, mode, paint);
}
void onDrawPoints(SkCanvas::PointMode mode,
size_t count,
const SkPoint pts[],
const SkPaint& paint) override {
fRecorder.getRecordingCanvas()->drawPoints(mode, count, pts, paint);
}
void onDrawImage2(const SkImage* image,
SkScalar dx,
SkScalar dy,
const SkSamplingOptions& sampling,
const SkPaint* paint) override {
fRecorder.getRecordingCanvas()->drawImage(image, dx, dy, sampling, paint);
}
void onDrawImageRect2(const SkImage* image,
const SkRect& src,
const SkRect& dst,
const SkSamplingOptions& sampling,
const SkPaint* paint,
SrcRectConstraint constraint) override {
if (fNextDrawImageFromLayerID != -1) {
this->recordPicCmd();
auto drawLayer = std::make_unique<DrawLayerCmd>();
drawLayer->fLayerId = fNextDrawImageFromLayerID;
drawLayer->fLayerCmdCnt = fOffscreenLayers->at(fNextDrawImageFromLayerID).fCmds.size();
drawLayer->fSrcRect = src;
drawLayer->fDstRect = dst;
drawLayer->fSampling = sampling;
drawLayer->fConstraint = constraint;
if (paint) {
drawLayer->fPaint.init(*paint);
}
fDst->fCmds.push_back(std::move(drawLayer));
fNextDrawImageFromLayerID = -1;
return;
}
fRecorder.getRecordingCanvas()->drawImageRect(image, src, dst, sampling, paint, constraint);
}
void onDrawImageLattice2(const SkImage* image,
const Lattice& lattice,
const SkRect& dst,
SkFilterMode mode,
const SkPaint* paint) override {
fRecorder.getRecordingCanvas()->drawImageLattice(image, lattice, dst, mode, paint);
}
void onDrawAtlas2(const SkImage* image,
const SkRSXform rsxForms[],
const SkRect src[],
const SkColor colors[],
int count,
SkBlendMode mode,
const SkSamplingOptions& sampling,
const SkRect* cull,
const SkPaint* paint) override {
fRecorder.getRecordingCanvas()->drawAtlas(image,
rsxForms,
src,
colors,
count,
mode,
sampling,
cull,
paint);
}
void onDrawEdgeAAImageSet2(const ImageSetEntry imageSet[],
int count,
const SkPoint dstClips[],
const SkMatrix preViewMatrices[],
const SkSamplingOptions& sampling,
const SkPaint* paint,
SrcRectConstraint constraint) override {
fRecorder.getRecordingCanvas()->experimental_DrawEdgeAAImageSet(imageSet,
count,
dstClips,
preViewMatrices,
sampling,
paint,
constraint);
}
#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
void onDrawEdgeAAQuad(const SkRect& rect,
const SkPoint clip[4],
SkCanvas::QuadAAFlags aaFlags,
const SkColor4f& color,
SkBlendMode mode) override {}
#else
void onDrawEdgeAAQuad(const SkRect& rect,
const SkPoint clip[4],
SkCanvas::QuadAAFlags aaFlags,
const SkColor4f& color,
SkBlendMode mode) override {
fRecorder.getRecordingCanvas()->experimental_DrawEdgeAAQuad(rect,
clip,
aaFlags,
color,
mode);
}
#endif
void onDrawAnnotation(const SkRect& rect, const char key[], SkData* value) override {
static constexpr char kOffscreenLayerDraw[] = "OffscreenLayerDraw";
static constexpr char kSurfaceID[] = "SurfaceID";
SkTArray<SkString> tokens;
SkStrSplit(key, "|", kStrict_SkStrSplitMode, &tokens);
if (tokens.size() == 2) {
if (tokens[0].equals(kOffscreenLayerDraw)) {
// Indicates that the next drawPicture command contains the SkPicture to render
// to the layer identified by the ID. 'rect' indicates the dirty area to update
// (and indicates the layer size if this command is introducing a new layer id).
fNextDrawPictureToLayerID = std::stoi(tokens[1].c_str());
fNextDrawPictureToLayerClipRect = rect.roundOut();
if (fOffscreenLayers->find(fNextDrawPictureToLayerID) == fOffscreenLayers->end()) {
SkASSERT(fNextDrawPictureToLayerClipRect.left() == 0 &&
fNextDrawPictureToLayerClipRect.top() == 0);
(*fOffscreenLayers)[fNextDrawPictureToLayerID].fDimensions =
fNextDrawPictureToLayerClipRect.size();
}
// The next draw picture will notice that fNextDrawPictureToLayerID is set and
// redirect the picture to the offscreen layer.
return;
} else if (tokens[0].equals(kSurfaceID)) {
// Indicates that the following drawImageRect should draw an offscreen layer
// to this layer.
fNextDrawImageFromLayerID = std::stoi(tokens[1].c_str());
return;
}
}
}
void onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) override {
fRecorder.getRecordingCanvas()->private_draw_shadow_rec(path, rec);
}
void onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) override {
fRecorder.getRecordingCanvas()->drawDrawable(drawable, matrix);
}
void onDrawPicture(const SkPicture* picture,
const SkMatrix* matrix,
const SkPaint* paint) override {
if (fNextDrawPictureToLayerID != -1) {
SkASSERT(!matrix);
SkASSERT(!paint);
LayerCmds* layer = &fOffscreenLayers->at(fNextDrawPictureToLayerID);
CmdRecordCanvas sc(layer, fOffscreenLayers, &fNextDrawPictureToLayerClipRect);
picture->playback(&sc);
fNextDrawPictureToLayerID = -1;
fNextDrawPictureToLayerClipRect = SkIRect::MakeEmpty();
return;
}
if (paint) {
this->saveLayer(nullptr, paint);
}
if (matrix) {
this->save();
this->concat(*matrix);
}
picture->playback(this);
if (matrix) {
this->restore();
}
if (paint) {
this->restore();
}
fRecorder.getRecordingCanvas()->drawPicture(picture, matrix, paint);
}
private:
void recordPicCmd() {
auto cmd = std::make_unique<PicCmd>();
cmd->fContent = fRecorder.finishRecordingAsPicture();
cmd->fClipRect = fClipRect;
if (cmd->fContent) {
fDst->fCmds.push_back(std::move(cmd));
}
// Set up to accumulate again.
fRecorder.beginRecording(SkRect::Make(fDst->fDimensions));
}
SkPictureRecorder fRecorder; // accumulates draws until we draw an offscreen into this layer.
LayerCmds* fDst = nullptr;
SkIRect fClipRect = SkIRect::MakeEmpty();
int fNextDrawPictureToLayerID = -1;
SkIRect fNextDrawPictureToLayerClipRect = SkIRect::MakeEmpty();
int fNextDrawImageFromLayerID = -1;
LayerMap* fOffscreenLayers = nullptr;
};
///////////////////////////////////////////////////////////////////////////////
std::unique_ptr<MSKPPlayer> MSKPPlayer::Make(SkStreamSeekable* stream) {
auto deserialContext = std::make_unique<SkSharingDeserialContext>();
SkDeserialProcs procs;
procs.fImageProc = SkSharingDeserialContext::deserializeImage;
procs.fImageCtx = deserialContext.get();
int pageCount = SkMultiPictureDocumentReadPageCount(stream);
if (!pageCount) {
return nullptr;
}
std::vector<SkDocumentPage> pages(pageCount);
if (!SkMultiPictureDocumentRead(stream, pages.data(), pageCount, &procs)) {
return nullptr;
}
std::unique_ptr<MSKPPlayer> result(new MSKPPlayer);
result->fRootLayers.reserve(pages.size());
for (const auto& page : pages) {
SkISize dims = {SkScalarCeilToInt(page.fSize.width()),
SkScalarCeilToInt(page.fSize.height())};
result->fRootLayers.emplace_back();
result->fRootLayers.back().fDimensions = dims;
result->fMaxDimensions.fWidth = std::max(dims.width() , result->fMaxDimensions.width() );
result->fMaxDimensions.fHeight = std::max(dims.height(), result->fMaxDimensions.height());
CmdRecordCanvas sc(&result->fRootLayers.back(), &result->fOffscreenLayers);
page.fPicture->playback(&sc);
}
return result;
}
MSKPPlayer::~MSKPPlayer() = default;
SkISize MSKPPlayer::frameDimensions(int i) const {
if (i < 0 || i >= this->numFrames()) {
return {-1, -1};
}
return fRootLayers[i].fDimensions;
}
bool MSKPPlayer::playFrame(SkCanvas* canvas, int i) {
if (i < 0 || i >= this->numFrames()) {
return false;
}
// Find the first offscreen layer that has a valid surface. If it's recording context
// differs from the passed canvas's then reset all the layers. Playback will
// automatically allocate new surfaces for offscreen layers as they're encountered.
for (const auto& ols : fOffscreenLayerStates) {
const LayerState& state = ols.second;
if (state.fSurface) {
if (state.fSurface->recordingContext() != canvas->recordingContext()) {
this->resetLayers();
}
break;
}
}
// Replay all the commands for this frame to the caller's canvas.
const LayerCmds& layer = fRootLayers[i];
for (const auto& cmd : layer.fCmds) {
cmd->draw(canvas, fOffscreenLayers, &fOffscreenLayerStates);
}
return true;
}
sk_sp<SkSurface> MSKPPlayer::MakeSurfaceForLayer(const LayerCmds& layer, SkCanvas* rootCanvas) {
// Assume layer has same surface props and info as this (mskp doesn't currently record this
// data).
SkSurfaceProps props;
rootCanvas->getProps(&props);
return rootCanvas->makeSurface(rootCanvas->imageInfo().makeDimensions(layer.fDimensions),
&props);
}
void MSKPPlayer::resetLayers() { fOffscreenLayerStates.clear(); }
void MSKPPlayer::rewindLayers() {
for (auto& [id, state] : fOffscreenLayerStates) {
state.fCurrCmd = -1;
}
}
void MSKPPlayer::allocateLayers(SkCanvas* canvas) {
// Iterate over layers not states as states are lazily created in playback but here we want to
// create any that don't already exist.
for (auto& [id, layer] : fOffscreenLayers) {
LayerState& state = fOffscreenLayerStates[id];
if (!state.fSurface || state.fSurface->recordingContext() != canvas->recordingContext()) {
state.fCurrCmd = -1;
state.fSurface = MakeSurfaceForLayer(fOffscreenLayers[id], canvas);
}
}
}
std::vector<int> MSKPPlayer::layerIDs(int frame) const {
std::vector<int> result;
if (frame < 0) {
result.reserve(fOffscreenLayers.size());
for (auto& [id, _] : fOffscreenLayers) {
result.push_back(id);
}
return result;
}
if (frame < static_cast<int>(fRootLayers.size())) {
this->collectReferencedLayers(fRootLayers[frame], &result);
}
return result;
}
sk_sp<SkImage> MSKPPlayer::layerSnapshot(int layerID) const {
auto iter = fOffscreenLayerStates.find(layerID);
if (iter == fOffscreenLayerStates.end() || !iter->second.fSurface) {
return nullptr;
}
return iter->second.fSurface->makeImageSnapshot();
}
void MSKPPlayer::collectReferencedLayers(const LayerCmds& layer, std::vector<int>* out) const {
for (const auto& cmd : layer.fCmds) {
if (int id = cmd->layerID(); id >= 0) {
// Linear, but we'd need to have a lot of layers to actually care.
if (std::find(out->begin(), out->end(), id) == out->end()) {
out->push_back(id);
auto iter = fOffscreenLayers.find(id);
SkASSERT(iter != fOffscreenLayers.end());
this->collectReferencedLayers(iter->second, out);
}
}
}
}