path: root/gfx/2d/DrawTargetRecording.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "DrawTargetRecording.h"
#include "DrawTargetSkia.h"
#include "PathRecording.h"
#include <stdio.h>

#include "Logging.h"
#include "Tools.h"
#include "Filters.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "mozilla/layers/SourceSurfaceSharedData.h"
#include "mozilla/UniquePtr.h"
#include "nsXULAppAPI.h"  // for XRE_IsContentProcess()
#include "RecordingTypes.h"
#include "RecordedEventImpl.h"

namespace mozilla {
namespace gfx {

struct RecordingSourceSurfaceUserData {
  void* refPtr;
  RefPtr<DrawEventRecorderPrivate> recorder;

  // The optimized surface holds a reference to our surface, for GetDataSurface
  // calls, so we must hold a weak reference to avoid circular dependency.
  ThreadSafeWeakPtr<SourceSurface> optimizedSurface;
};

static void RecordingSourceSurfaceUserDataFunc(void* aUserData) {
  RecordingSourceSurfaceUserData* userData =
      static_cast<RecordingSourceSurfaceUserData*>(aUserData);

  userData->recorder->RecordSourceSurfaceDestruction(
      static_cast<SourceSurface*>(userData->refPtr));

  delete userData;
}

static void EnsureSurfaceStoredRecording(DrawEventRecorderPrivate* aRecorder,
                                         SourceSurface* aSurface,
                                         const char* reason) {
  if (aRecorder->HasStoredObject(aSurface)) {
    return;
  }

  aRecorder->StoreSourceSurfaceRecording(aSurface, reason);
  aRecorder->AddStoredObject(aSurface);
  aRecorder->AddSourceSurface(aSurface);

  RecordingSourceSurfaceUserData* userData = new RecordingSourceSurfaceUserData;
  userData->refPtr = aSurface;
  userData->recorder = aRecorder;
  aSurface->AddUserData(reinterpret_cast<UserDataKey*>(aRecorder), userData,
                        &RecordingSourceSurfaceUserDataFunc);
}

class SourceSurfaceRecording : public SourceSurface {
 public:
  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(SourceSurfaceRecording, override)

  SourceSurfaceRecording(IntSize aSize, SurfaceFormat aFormat,
                         DrawEventRecorderPrivate* aRecorder,
                         SourceSurface* aOriginalSurface = nullptr)
      : mSize(aSize),
        mFormat(aFormat),
        mRecorder(aRecorder),
        mOriginalSurface(aOriginalSurface) {
    mRecorder->AddStoredObject(this);
  }

  ~SourceSurfaceRecording() {
    mRecorder->RemoveStoredObject(this);
    mRecorder->RecordEvent(
        RecordedSourceSurfaceDestruction(ReferencePtr(this)));
  }

  SurfaceType GetType() const override { return SurfaceType::RECORDING; }
  IntSize GetSize() const override { return mSize; }
  SurfaceFormat GetFormat() const override { return mFormat; }
  already_AddRefed<DataSourceSurface> GetDataSurface() override {
    if (mOriginalSurface) {
      return mOriginalSurface->GetDataSurface();
    }

    return nullptr;
  }

  IntSize mSize;
  SurfaceFormat mFormat;
  RefPtr<DrawEventRecorderPrivate> mRecorder;
  // If a SourceSurfaceRecording is returned from an OptimizeSourceSurface call
  // we need GetDataSurface to work, so we hold the original surface we
  // optimized to return its GetDataSurface.
  RefPtr<SourceSurface> mOriginalSurface;
};

class GradientStopsRecording : public GradientStops {
 public:
  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(GradientStopsRecording, override)

  explicit GradientStopsRecording(DrawEventRecorderPrivate* aRecorder)
      : mRecorder(aRecorder) {
    mRecorder->AddStoredObject(this);
  }

  virtual ~GradientStopsRecording() {
    mRecorder->RemoveStoredObject(this);
    mRecorder->RecordEvent(
        RecordedGradientStopsDestruction(ReferencePtr(this)));
  }

  BackendType GetBackendType() const override { return BackendType::RECORDING; }

  RefPtr<DrawEventRecorderPrivate> mRecorder;
};

class FilterNodeRecording : public FilterNode {
 public:
  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(FilterNodeRecording, override)
  using FilterNode::SetAttribute;

  explicit FilterNodeRecording(DrawEventRecorderPrivate* aRecorder)
      : mRecorder(aRecorder) {
    mRecorder->AddStoredObject(this);
  }

  virtual ~FilterNodeRecording() {
    mRecorder->RemoveStoredObject(this);
    mRecorder->RecordEvent(RecordedFilterNodeDestruction(ReferencePtr(this)));
  }

  void SetInput(uint32_t aIndex, SourceSurface* aSurface) override {
    EnsureSurfaceStoredRecording(mRecorder, aSurface, "SetInput");

    mRecorder->RecordEvent(RecordedFilterNodeSetInput(this, aIndex, aSurface));
  }
  void SetInput(uint32_t aIndex, FilterNode* aFilter) override {
    MOZ_ASSERT(mRecorder->HasStoredObject(aFilter));

    mRecorder->RecordEvent(RecordedFilterNodeSetInput(this, aIndex, aFilter));
  }

#define FORWARD_SET_ATTRIBUTE(type, argtype)                 \
  void SetAttribute(uint32_t aIndex, type aValue) override { \
    mRecorder->RecordEvent(RecordedFilterNodeSetAttribute(   \
        this, aIndex, aValue,                                \
        RecordedFilterNodeSetAttribute::ARGTYPE_##argtype)); \
  }

  FORWARD_SET_ATTRIBUTE(bool, BOOL);
  FORWARD_SET_ATTRIBUTE(uint32_t, UINT32);
  FORWARD_SET_ATTRIBUTE(Float, FLOAT);
  FORWARD_SET_ATTRIBUTE(const Size&, SIZE);
  FORWARD_SET_ATTRIBUTE(const IntSize&, INTSIZE);
  FORWARD_SET_ATTRIBUTE(const IntPoint&, INTPOINT);
  FORWARD_SET_ATTRIBUTE(const Rect&, RECT);
  FORWARD_SET_ATTRIBUTE(const IntRect&, INTRECT);
  FORWARD_SET_ATTRIBUTE(const Point&, POINT);
  FORWARD_SET_ATTRIBUTE(const Matrix&, MATRIX);
  FORWARD_SET_ATTRIBUTE(const Matrix5x4&, MATRIX5X4);
  FORWARD_SET_ATTRIBUTE(const Point3D&, POINT3D);
  FORWARD_SET_ATTRIBUTE(const DeviceColor&, COLOR);

#undef FORWARD_SET_ATTRIBUTE

  void SetAttribute(uint32_t aIndex, const Float* aFloat,
                    uint32_t aSize) override {
    mRecorder->RecordEvent(
        RecordedFilterNodeSetAttribute(this, aIndex, aFloat, aSize));
  }

  FilterBackend GetBackendType() override { return FILTER_BACKEND_RECORDING; }

  RefPtr<DrawEventRecorderPrivate> mRecorder;
};

DrawTargetRecording::DrawTargetRecording(DrawEventRecorder* aRecorder,
                                         DrawTarget* aDT, IntRect aRect,
                                         bool aHasData)
    : mRecorder(static_cast<DrawEventRecorderPrivate*>(aRecorder)),
      mFinalDT(aDT),
      mRect(aRect) {
  RefPtr<SourceSurface> snapshot = aHasData ? mFinalDT->Snapshot() : nullptr;
  mRecorder->RecordEvent(
      RecordedDrawTargetCreation(this, mFinalDT->GetBackendType(), mRect,
                                 mFinalDT->GetFormat(), aHasData, snapshot));
  mFormat = mFinalDT->GetFormat();
}

DrawTargetRecording::DrawTargetRecording(const DrawTargetRecording* aDT,
                                         IntRect aRect, SurfaceFormat aFormat)
    : mRecorder(aDT->mRecorder), mFinalDT(aDT->mFinalDT), mRect(aRect) {
  mFormat = aFormat;
}

DrawTargetRecording::~DrawTargetRecording() {
  mRecorder->RecordEvent(RecordedDrawTargetDestruction(ReferencePtr(this)));
}

void DrawTargetRecording::Link(const char* aDestination, const Rect& aRect) {
  mRecorder->RecordEvent(RecordedLink(this, aDestination, aRect));
}

void DrawTargetRecording::Destination(const char* aDestination,
                                      const Point& aPoint) {
  mRecorder->RecordEvent(RecordedDestination(this, aDestination, aPoint));
}

void DrawTargetRecording::FillRect(const Rect& aRect, const Pattern& aPattern,
                                   const DrawOptions& aOptions) {
  EnsurePatternDependenciesStored(aPattern);

  mRecorder->RecordEvent(RecordedFillRect(this, aRect, aPattern, aOptions));
}

void DrawTargetRecording::StrokeRect(const Rect& aRect, const Pattern& aPattern,
                                     const StrokeOptions& aStrokeOptions,
                                     const DrawOptions& aOptions) {
  EnsurePatternDependenciesStored(aPattern);

  mRecorder->RecordEvent(
      RecordedStrokeRect(this, aRect, aPattern, aStrokeOptions, aOptions));
}

void DrawTargetRecording::StrokeLine(const Point& aBegin, const Point& aEnd,
                                     const Pattern& aPattern,
                                     const StrokeOptions& aStrokeOptions,
                                     const DrawOptions& aOptions) {
  EnsurePatternDependenciesStored(aPattern);

  mRecorder->RecordEvent(RecordedStrokeLine(this, aBegin, aEnd, aPattern,
                                            aStrokeOptions, aOptions));
}

void DrawTargetRecording::Fill(const Path* aPath, const Pattern& aPattern,
                               const DrawOptions& aOptions) {
  if (!aPath) {
    return;
  }

  RefPtr<PathRecording> pathRecording = EnsurePathStored(aPath);
  EnsurePatternDependenciesStored(aPattern);

  mRecorder->RecordEvent(RecordedFill(this, pathRecording, aPattern, aOptions));
}

struct RecordingFontUserData {
  void* refPtr;
  void* unscaledFont;
  RefPtr<DrawEventRecorderPrivate> recorder;
};

static void RecordingFontUserDataDestroyFunc(void* aUserData) {
  RecordingFontUserData* userData =
      static_cast<RecordingFontUserData*>(aUserData);

  userData->recorder->RecordEvent(
      RecordedScaledFontDestruction(ReferencePtr(userData->refPtr)));
  userData->recorder->RemoveScaledFont((ScaledFont*)userData->refPtr);
  userData->recorder->DecrementUnscaledFontRefCount(userData->unscaledFont);
  delete userData;
}

void DrawTargetRecording::FillGlyphs(ScaledFont* aFont,
                                     const GlyphBuffer& aBuffer,
                                     const Pattern& aPattern,
                                     const DrawOptions& aOptions) {
  if (!aFont) {
    return;
  }

  EnsurePatternDependenciesStored(aPattern);

  UserDataKey* userDataKey = reinterpret_cast<UserDataKey*>(mRecorder.get());
  if (mRecorder->WantsExternalFonts()) {
    mRecorder->AddScaledFont(aFont);
  } else if (!aFont->GetUserData(userDataKey)) {
    UnscaledFont* unscaledFont = aFont->GetUnscaledFont();
    if (mRecorder->IncrementUnscaledFontRefCount(unscaledFont) == 0) {
      // Prefer sending the description, if we can create one. This ensures
      // we don't record the data of system fonts which saves time and can
      // prevent duplicate copies from accumulating in the OS cache during
      // playback.
      RecordedFontDescriptor fontDesc(unscaledFont);
      if (fontDesc.IsValid()) {
        mRecorder->RecordEvent(fontDesc);
      } else {
        RecordedFontData fontData(unscaledFont);
        RecordedFontDetails fontDetails;
        if (fontData.GetFontDetails(fontDetails)) {
          // Try to serialise the whole font, just in case this is a web font
          // that is not present on the system.
          if (!mRecorder->HasStoredFontData(fontDetails.fontDataKey)) {
            mRecorder->RecordEvent(fontData);
            mRecorder->AddStoredFontData(fontDetails.fontDataKey);
          }
          mRecorder->RecordEvent(
              RecordedUnscaledFontCreation(unscaledFont, fontDetails));
        } else {
          gfxWarning() << "DrawTargetRecording::FillGlyphs failed to serialise "
                          "UnscaledFont";
        }
      }
    }
    mRecorder->RecordEvent(RecordedScaledFontCreation(aFont, unscaledFont));
    RecordingFontUserData* userData = new RecordingFontUserData;
    userData->refPtr = aFont;
    userData->unscaledFont = unscaledFont;
    userData->recorder = mRecorder;
    aFont->AddUserData(userDataKey, userData,
                       &RecordingFontUserDataDestroyFunc);
    userData->recorder->AddScaledFont(aFont);
  }

  mRecorder->RecordEvent(RecordedFillGlyphs(
      this, aFont, aPattern, aOptions, aBuffer.mGlyphs, aBuffer.mNumGlyphs));
}

void DrawTargetRecording::Mask(const Pattern& aSource, const Pattern& aMask,
                               const DrawOptions& aOptions) {
  EnsurePatternDependenciesStored(aSource);
  EnsurePatternDependenciesStored(aMask);

  mRecorder->RecordEvent(RecordedMask(this, aSource, aMask, aOptions));
}

void DrawTargetRecording::MaskSurface(const Pattern& aSource,
                                      SourceSurface* aMask, Point aOffset,
                                      const DrawOptions& aOptions) {
  if (!aMask) {
    return;
  }

  EnsurePatternDependenciesStored(aSource);
  EnsureSurfaceStoredRecording(mRecorder, aMask, "MaskSurface");

  mRecorder->RecordEvent(
      RecordedMaskSurface(this, aSource, aMask, aOffset, aOptions));
}

void DrawTargetRecording::Stroke(const Path* aPath, const Pattern& aPattern,
                                 const StrokeOptions& aStrokeOptions,
                                 const DrawOptions& aOptions) {
  RefPtr<PathRecording> pathRecording = EnsurePathStored(aPath);
  EnsurePatternDependenciesStored(aPattern);

  mRecorder->RecordEvent(
      RecordedStroke(this, pathRecording, aPattern, aStrokeOptions, aOptions));
}

already_AddRefed<SourceSurface> DrawTargetRecording::Snapshot() {
  RefPtr<SourceSurface> retSurf =
      new SourceSurfaceRecording(mRect.Size(), mFormat, mRecorder);

  mRecorder->RecordEvent(RecordedSnapshot(retSurf, this));

  return retSurf.forget();
}

already_AddRefed<SourceSurface> DrawTargetRecording::IntoLuminanceSource(
    LuminanceType aLuminanceType, float aOpacity) {
  RefPtr<SourceSurface> retSurf =
      new SourceSurfaceRecording(mRect.Size(), SurfaceFormat::A8, mRecorder);

  mRecorder->RecordEvent(
      RecordedIntoLuminanceSource(retSurf, this, aLuminanceType, aOpacity));

  return retSurf.forget();
}

void DrawTargetRecording::Flush() {
  mRecorder->RecordEvent(RecordedFlush(this));
}

void DrawTargetRecording::DetachAllSnapshots() {
  mRecorder->RecordEvent(RecordedDetachAllSnapshots(this));
}

void DrawTargetRecording::DrawSurface(SourceSurface* aSurface,
                                      const Rect& aDest, const Rect& aSource,
                                      const DrawSurfaceOptions& aSurfOptions,
                                      const DrawOptions& aOptions) {
  if (!aSurface) {
    return;
  }

  EnsureSurfaceStoredRecording(mRecorder, aSurface, "DrawSurface");

  mRecorder->RecordEvent(RecordedDrawSurface(this, aSurface, aDest, aSource,
                                             aSurfOptions, aOptions));
}

void DrawTargetRecording::DrawDependentSurface(uint64_t aId,
                                               const Rect& aDest) {
  mRecorder->AddDependentSurface(aId);
  mRecorder->RecordEvent(RecordedDrawDependentSurface(this, aId, aDest));
}

void DrawTargetRecording::DrawSurfaceWithShadow(SourceSurface* aSurface,
                                                const Point& aDest,
                                                const ShadowOptions& aShadow,
                                                CompositionOp aOp) {
  if (!aSurface) {
    return;
  }

  EnsureSurfaceStoredRecording(mRecorder, aSurface, "DrawSurfaceWithShadow");

  mRecorder->RecordEvent(
      RecordedDrawSurfaceWithShadow(this, aSurface, aDest, aShadow, aOp));
}

void DrawTargetRecording::DrawFilter(FilterNode* aNode, const Rect& aSourceRect,
                                     const Point& aDestPoint,
                                     const DrawOptions& aOptions) {
  if (!aNode) {
    return;
  }

  MOZ_ASSERT(mRecorder->HasStoredObject(aNode));

  mRecorder->RecordEvent(
      RecordedDrawFilter(this, aNode, aSourceRect, aDestPoint, aOptions));
}

already_AddRefed<FilterNode> DrawTargetRecording::CreateFilter(
    FilterType aType) {
  RefPtr<FilterNode> retNode = new FilterNodeRecording(mRecorder);

  mRecorder->RecordEvent(RecordedFilterNodeCreation(retNode, aType));

  return retNode.forget();
}

void DrawTargetRecording::ClearRect(const Rect& aRect) {
  mRecorder->RecordEvent(RecordedClearRect(this, aRect));
}

void DrawTargetRecording::CopySurface(SourceSurface* aSurface,
                                      const IntRect& aSourceRect,
                                      const IntPoint& aDestination) {
  if (!aSurface) {
    return;
  }

  EnsureSurfaceStoredRecording(mRecorder, aSurface, "CopySurface");

  mRecorder->RecordEvent(
      RecordedCopySurface(this, aSurface, aSourceRect, aDestination));
}

void DrawTargetRecording::PushClip(const Path* aPath) {
  if (!aPath) {
    return;
  }

  // The canvas doesn't have a clipRect API so we always end up in the generic
  // path. The D2D backend doesn't have a good way of specializing rectangular
  // clips so we take advantage of the fact that aPath is usually backed by a
  // SkiaPath which implements AsRect() and specialize it here.
  auto rect = aPath->AsRect();
  if (rect.isSome()) {
    PushClipRect(rect.value());
    return;
  }

  RefPtr<PathRecording> pathRecording = EnsurePathStored(aPath);

  mRecorder->RecordEvent(RecordedPushClip(this, pathRecording));
}

void DrawTargetRecording::PushClipRect(const Rect& aRect) {
  mRecorder->RecordEvent(RecordedPushClipRect(this, aRect));
}

void DrawTargetRecording::PopClip() {
  mRecorder->RecordEvent(RecordedPopClip(static_cast<DrawTarget*>(this)));
}

void DrawTargetRecording::PushLayer(bool aOpaque, Float aOpacity,
                                    SourceSurface* aMask,
                                    const Matrix& aMaskTransform,
                                    const IntRect& aBounds,
                                    bool aCopyBackground) {
  if (aMask) {
    EnsureSurfaceStoredRecording(mRecorder, aMask, "PushLayer");
  }

  mRecorder->RecordEvent(RecordedPushLayer(this, aOpaque, aOpacity, aMask,
                                           aMaskTransform, aBounds,
                                           aCopyBackground));
}

void DrawTargetRecording::PushLayerWithBlend(bool aOpaque, Float aOpacity,
                                             SourceSurface* aMask,
                                             const Matrix& aMaskTransform,
                                             const IntRect& aBounds,
                                             bool aCopyBackground,
                                             CompositionOp aCompositionOp) {
  if (aMask) {
    EnsureSurfaceStoredRecording(mRecorder, aMask, "PushLayer");
  }

  mRecorder->RecordEvent(
      RecordedPushLayerWithBlend(this, aOpaque, aOpacity, aMask, aMaskTransform,
                                 aBounds, aCopyBackground, aCompositionOp));
}

void DrawTargetRecording::PopLayer() {
  mRecorder->RecordEvent(RecordedPopLayer(static_cast<DrawTarget*>(this)));
}

already_AddRefed<SourceSurface>
DrawTargetRecording::CreateSourceSurfaceFromData(unsigned char* aData,
                                                 const IntSize& aSize,
                                                 int32_t aStride,
                                                 SurfaceFormat aFormat) const {
  RefPtr<SourceSurface> surface = CreateDataSourceSurfaceWithStrideFromData(
      aSize, aFormat, aStride, aData, aStride);
  if (!surface) {
    return nullptr;
  }

  return OptimizeSourceSurface(surface);
}

already_AddRefed<SourceSurface> DrawTargetRecording::OptimizeSourceSurface(
    SourceSurface* aSurface) const {
  // See if we have a previously optimized surface available. We have to do this
  // check before the SurfaceType::RECORDING below, because aSurface might be a
  // SurfaceType::RECORDING from another recorder we have previously optimized.
  auto* userData = static_cast<RecordingSourceSurfaceUserData*>(
      aSurface->GetUserData(reinterpret_cast<UserDataKey*>(mRecorder.get())));
  if (userData) {
    RefPtr<SourceSurface> strongRef(userData->optimizedSurface);
    if (strongRef) {
      return do_AddRef(strongRef);
    }
  }

  if (aSurface->GetType() == SurfaceType::RECORDING &&
      mRecorder->HasStoredObject(aSurface)) {
    // aSurface is already optimized for our recorder.
    return do_AddRef(aSurface);
  }

  EnsureSurfaceStoredRecording(mRecorder, aSurface, "OptimizeSourceSurface");

  RefPtr<SourceSurface> retSurf = new SourceSurfaceRecording(
      aSurface->GetSize(), aSurface->GetFormat(), mRecorder, aSurface);

  mRecorder->RecordEvent(
      RecordedOptimizeSourceSurface(aSurface, this, retSurf));

  userData = static_cast<RecordingSourceSurfaceUserData*>(
      aSurface->GetUserData(reinterpret_cast<UserDataKey*>(mRecorder.get())));
  MOZ_ASSERT(
      userData,
      "User data should always have been set by EnsureSurfaceStoredRecording.");
  userData->optimizedSurface = retSurf;

  return retSurf.forget();
}

already_AddRefed<SourceSurface>
DrawTargetRecording::CreateSourceSurfaceFromNativeSurface(
    const NativeSurface& aSurface) const {
  MOZ_ASSERT(false);
  return nullptr;
}

already_AddRefed<DrawTarget>
DrawTargetRecording::CreateSimilarDrawTargetWithBacking(
    const IntSize& aSize, SurfaceFormat aFormat) const {
  RefPtr<DrawTarget> similarDT;
  if (mFinalDT->CanCreateSimilarDrawTarget(aSize, aFormat)) {
    // If the requested similar draw target is too big, then we should try to
    // rasterize on the content side to avoid duplicating the effort when a
    // blob image gets tiled. If we fail somehow to produce it, we can fall
    // back to recording.
    constexpr int32_t kRasterThreshold = 256 * 256 * 4;
    int32_t stride = aSize.width * BytesPerPixel(aFormat);
    int32_t surfaceBytes = aSize.height * stride;
    if (surfaceBytes >= kRasterThreshold) {
      auto surface = MakeRefPtr<SourceSurfaceSharedData>();
      if (surface->Init(aSize, stride, aFormat)) {
        auto dt = MakeRefPtr<DrawTargetSkia>();
        if (dt->Init(std::move(surface))) {
          return dt.forget();
        } else {
          MOZ_ASSERT_UNREACHABLE("Skia should initialize given surface!");
        }
      }
    }
  }

  return CreateSimilarDrawTarget(aSize, aFormat);
}

already_AddRefed<DrawTarget> DrawTargetRecording::CreateSimilarDrawTarget(
    const IntSize& aSize, SurfaceFormat aFormat) const {
  RefPtr<DrawTarget> similarDT;
  if (mFinalDT->CanCreateSimilarDrawTarget(aSize, aFormat)) {
    similarDT =
        new DrawTargetRecording(this, IntRect(IntPoint(0, 0), aSize), aFormat);
    mRecorder->RecordEvent(
        RecordedCreateSimilarDrawTarget(similarDT.get(), aSize, aFormat));
  } else if (XRE_IsContentProcess()) {
    // Crash any content process that calls this function with arguments that
    // would fail to create a similar draw target. We do this to root out bad
    // callers. We don't want to crash any important processes though so for
    // for those we'll just gracefully return nullptr.
    MOZ_CRASH(
        "Content-process DrawTargetRecording can't create requested similar "
        "drawtarget");
  }
  return similarDT.forget();
}

bool DrawTargetRecording::CanCreateSimilarDrawTarget(
    const IntSize& aSize, SurfaceFormat aFormat) const {
  return mFinalDT->CanCreateSimilarDrawTarget(aSize, aFormat);
}

RefPtr<DrawTarget> DrawTargetRecording::CreateClippedDrawTarget(
    const Rect& aBounds, SurfaceFormat aFormat) {
  RefPtr<DrawTarget> similarDT;
  similarDT = new DrawTargetRecording(this, mRect, aFormat);
  mRecorder->RecordEvent(
      RecordedCreateClippedDrawTarget(this, similarDT.get(), aBounds, aFormat));
  similarDT->SetTransform(mTransform);
  return similarDT;
}

already_AddRefed<DrawTarget>
DrawTargetRecording::CreateSimilarDrawTargetForFilter(
    const IntSize& aMaxSize, SurfaceFormat aFormat, FilterNode* aFilter,
    FilterNode* aSource, const Rect& aSourceRect, const Point& aDestPoint) {
  RefPtr<DrawTarget> similarDT;
  if (mFinalDT->CanCreateSimilarDrawTarget(aMaxSize, aFormat)) {
    similarDT = new DrawTargetRecording(this, IntRect(IntPoint(0, 0), aMaxSize),
                                        aFormat);
    mRecorder->RecordEvent(RecordedCreateDrawTargetForFilter(
        this, similarDT.get(), aMaxSize, aFormat, aFilter, aSource, aSourceRect,
        aDestPoint));
  } else if (XRE_IsContentProcess()) {
    // See CreateSimilarDrawTarget
    MOZ_CRASH(
        "Content-process DrawTargetRecording can't create requested clipped "
        "drawtarget");
  }
  return similarDT.forget();
}

already_AddRefed<PathBuilder> DrawTargetRecording::CreatePathBuilder(
    FillRule aFillRule) const {
  RefPtr<PathBuilder> builder = mFinalDT->CreatePathBuilder(aFillRule);
  return MakeAndAddRef<PathBuilderRecording>(builder, aFillRule);
}

already_AddRefed<GradientStops> DrawTargetRecording::CreateGradientStops(
    GradientStop* aStops, uint32_t aNumStops, ExtendMode aExtendMode) const {
  RefPtr<GradientStops> retStops = new GradientStopsRecording(mRecorder);

  mRecorder->RecordEvent(
      RecordedGradientStopsCreation(retStops, aStops, aNumStops, aExtendMode));

  return retStops.forget();
}

void DrawTargetRecording::SetTransform(const Matrix& aTransform) {
  mRecorder->RecordEvent(RecordedSetTransform(this, aTransform));
  DrawTarget::SetTransform(aTransform);
}

already_AddRefed<PathRecording> DrawTargetRecording::EnsurePathStored(
    const Path* aPath) {
  RefPtr<PathRecording> pathRecording;
  if (aPath->GetBackendType() == BackendType::RECORDING) {
    pathRecording =
        const_cast<PathRecording*>(static_cast<const PathRecording*>(aPath));
    if (mRecorder->HasStoredObject(aPath)) {
      return pathRecording.forget();
    }
  } else {
    MOZ_ASSERT(!mRecorder->HasStoredObject(aPath));
    FillRule fillRule = aPath->GetFillRule();
    RefPtr<PathBuilder> builder = mFinalDT->CreatePathBuilder(fillRule);
    RefPtr<PathBuilderRecording> builderRecording =
        new PathBuilderRecording(builder, fillRule);
    aPath->StreamToSink(builderRecording);
    pathRecording = builderRecording->Finish().downcast<PathRecording>();
  }

  mRecorder->RecordEvent(RecordedPathCreation(pathRecording.get()));
  mRecorder->AddStoredObject(pathRecording);
  pathRecording->mStoredRecorders.push_back(mRecorder);

  return pathRecording.forget();
}

// This should only be called on the 'root' DrawTargetRecording.
// Calling it on a child DrawTargetRecordings will cause confusion.
void DrawTargetRecording::FlushItem(const IntRect& aBounds) {
  mRecorder->FlushItem(aBounds);
  // Reinitialize the recorder (FlushItem will write a new recording header)
  // Tell the new recording about our draw target
  // This code should match what happens in the DrawTargetRecording constructor.
  mRecorder->RecordEvent(
      RecordedDrawTargetCreation(this, mFinalDT->GetBackendType(), mRect,
                                 mFinalDT->GetFormat(), false, nullptr));
  // Add the current transform to the new recording
  mRecorder->RecordEvent(
      RecordedSetTransform(this, DrawTarget::GetTransform()));
}

void DrawTargetRecording::EnsurePatternDependenciesStored(
    const Pattern& aPattern) {
  switch (aPattern.GetType()) {
    case PatternType::COLOR:
      // No dependencies here.
      return;
    case PatternType::LINEAR_GRADIENT: {
      MOZ_ASSERT_IF(
          static_cast<const LinearGradientPattern*>(&aPattern)->mStops,
          mRecorder->HasStoredObject(
              static_cast<const LinearGradientPattern*>(&aPattern)->mStops));
      return;
    }
    case PatternType::RADIAL_GRADIENT: {
      MOZ_ASSERT_IF(
          static_cast<const RadialGradientPattern*>(&aPattern)->mStops,
          mRecorder->HasStoredObject(
              static_cast<const RadialGradientPattern*>(&aPattern)->mStops));
      return;
    }
    case PatternType::CONIC_GRADIENT: {
      MOZ_ASSERT_IF(
          static_cast<const ConicGradientPattern*>(&aPattern)->mStops,
          mRecorder->HasStoredObject(
              static_cast<const ConicGradientPattern*>(&aPattern)->mStops));
      return;
    }
    case PatternType::SURFACE: {
      const SurfacePattern* pat = static_cast<const SurfacePattern*>(&aPattern);
      EnsureSurfaceStoredRecording(mRecorder, pat->mSurface,
                                   "EnsurePatternDependenciesStored");
      return;
    }
  }
}

}  // namespace gfx
}  // namespace mozilla