gecko-dev/gfx/2d/DrawTargetTiled.h

/* -*- 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/. */

#ifndef MOZILLA_GFX_DRAWTARGETTILED_H_
#define MOZILLA_GFX_DRAWTARGETTILED_H_

#include "2D.h"

#include "mozilla/Vector.h"

#include "Filters.h"
#include "Logging.h"

#include <vector>

namespace mozilla {
namespace gfx {

struct TileInternal : public Tile {
  TileInternal() : mClippedOut(false) {}

  explicit TileInternal(const Tile& aOther)
      : Tile(aOther), mClippedOut(false) {}

  bool mClippedOut;
};

class DrawTargetTiled : public DrawTarget {
 public:
  DrawTargetTiled();

  bool Init(const TileSet& mTiles);

  bool IsTiledDrawTarget() const override { return true; }

  bool IsCaptureDT() const override {
    return mTiles[0].mDrawTarget->IsCaptureDT();
  }
  DrawTargetType GetType() const override {
    return mTiles[0].mDrawTarget->GetType();
  }
  BackendType GetBackendType() const override {
    return mTiles[0].mDrawTarget->GetBackendType();
  }
  already_AddRefed<SourceSurface> Snapshot() override;
  void DetachAllSnapshots() override;
  IntSize GetSize() const override {
    MOZ_ASSERT(mRect.Width() > 0 && mRect.Height() > 0);
    return IntSize(mRect.XMost(), mRect.YMost());
  }
  IntRect GetRect() const override { return mRect; }

  void Flush() override;
  void DrawSurface(SourceSurface* aSurface, const Rect& aDest,
                   const Rect& aSource, const DrawSurfaceOptions& aSurfOptions,
                   const DrawOptions& aOptions) override;
  void DrawFilter(FilterNode* aNode, const Rect& aSourceRect,
                  const Point& aDestPoint,
                  const DrawOptions& aOptions = DrawOptions()) override;
  void DrawSurfaceWithShadow(
      SourceSurface* aSurface, const Point& aDest, const Color& aColor,
      const Point& aOffset, Float aSigma,
      CompositionOp aOperator) override { /* Not implemented */
    MOZ_CRASH("GFX: DrawSurfaceWithShadow");
  }

  void ClearRect(const Rect& aRect) override;
  void MaskSurface(const Pattern& aSource, SourceSurface* aMask, Point aOffset,
                   const DrawOptions& aOptions = DrawOptions()) override;

  void CopySurface(SourceSurface* aSurface, const IntRect& aSourceRect,
                   const IntPoint& aDestination) override;

  void FillRect(const Rect& aRect, const Pattern& aPattern,
                const DrawOptions& aOptions = DrawOptions()) override;
  void StrokeRect(const Rect& aRect, const Pattern& aPattern,
                  const StrokeOptions& aStrokeOptions = StrokeOptions(),
                  const DrawOptions& aOptions = DrawOptions()) override;
  void StrokeLine(const Point& aStart, const Point& aEnd,
                  const Pattern& aPattern,
                  const StrokeOptions& aStrokeOptions = StrokeOptions(),
                  const DrawOptions& aOptions = DrawOptions()) override;
  void Stroke(const Path* aPath, const Pattern& aPattern,
              const StrokeOptions& aStrokeOptions = StrokeOptions(),
              const DrawOptions& aOptions = DrawOptions()) override;
  void Fill(const Path* aPath, const Pattern& aPattern,
            const DrawOptions& aOptions = DrawOptions()) override;
  void FillGlyphs(ScaledFont* aFont, const GlyphBuffer& aBuffer,
                  const Pattern& aPattern,
                  const DrawOptions& aOptions = DrawOptions()) override;
  void Mask(const Pattern& aSource, const Pattern& aMask,
            const DrawOptions& aOptions = DrawOptions()) override;
  void PushClip(const Path* aPath) override;
  void PushClipRect(const Rect& aRect) override;
  void PopClip() override;
  void PushLayer(bool aOpaque, Float aOpacity, SourceSurface* aMask,
                 const Matrix& aMaskTransform,
                 const IntRect& aBounds = IntRect(),
                 bool aCopyBackground = false) override;
  void PushLayerWithBlend(bool aOpaque, Float aOpacity, SourceSurface* aMask,
                          const Matrix& aMaskTransform,
                          const IntRect& aBounds = IntRect(),
                          bool aCopyBackground = false,
                          CompositionOp = CompositionOp::OP_OVER) override;
  void PopLayer() override;

  void PadEdges(const IntRegion& aRegion) override;

  void SetTransform(const Matrix& aTransform) override;

  void SetPermitSubpixelAA(bool aPermitSubpixelAA) override;

  already_AddRefed<SourceSurface> CreateSourceSurfaceFromData(
      unsigned char* aData, const IntSize& aSize, int32_t aStride,
      SurfaceFormat aFormat) const override {
    return mTiles[0].mDrawTarget->CreateSourceSurfaceFromData(aData, aSize,
                                                              aStride, aFormat);
  }
  already_AddRefed<SourceSurface> OptimizeSourceSurface(
      SourceSurface* aSurface) const override {
    return mTiles[0].mDrawTarget->OptimizeSourceSurface(aSurface);
  }

  already_AddRefed<SourceSurface> CreateSourceSurfaceFromNativeSurface(
      const NativeSurface& aSurface) const override {
    return mTiles[0].mDrawTarget->CreateSourceSurfaceFromNativeSurface(
        aSurface);
  }

  already_AddRefed<DrawTarget> CreateSimilarDrawTarget(
      const IntSize& aSize, SurfaceFormat aFormat) const override {
    return mTiles[0].mDrawTarget->CreateSimilarDrawTarget(aSize, aFormat);
  }

  bool CanCreateSimilarDrawTarget(const IntSize& aSize,
                                  SurfaceFormat aFormat) const override {
    return mTiles[0].mDrawTarget->CanCreateSimilarDrawTarget(aSize, aFormat);
  }

  RefPtr<DrawTarget> CreateClippedDrawTarget(const Rect& aBounds,
                                             SurfaceFormat aFormat) override;

  already_AddRefed<PathBuilder> CreatePathBuilder(
      FillRule aFillRule = FillRule::FILL_WINDING) const override {
    return mTiles[0].mDrawTarget->CreatePathBuilder(aFillRule);
  }

  already_AddRefed<GradientStops> CreateGradientStops(
      GradientStop* aStops, uint32_t aNumStops,
      ExtendMode aExtendMode = ExtendMode::CLAMP) const override {
    return mTiles[0].mDrawTarget->CreateGradientStops(aStops, aNumStops,
                                                      aExtendMode);
  }
  already_AddRefed<FilterNode> CreateFilter(FilterType aType) override {
    return mTiles[0].mDrawTarget->CreateFilter(aType);
  }

 private:
  std::vector<TileInternal> mTiles;

  // mClippedOutTilesStack[clipIndex][tileIndex] is true if the tile at
  // tileIndex has become completely clipped out at the clip stack depth
  // clipIndex.
  Vector<std::vector<bool>, 8> mClippedOutTilesStack;

  IntRect mRect;

  struct PushedLayer {
    explicit PushedLayer(bool aOldPermitSubpixelAA)
        : mOldPermitSubpixelAA(aOldPermitSubpixelAA) {}
    bool mOldPermitSubpixelAA;
  };
  std::vector<PushedLayer> mPushedLayers;
};

class SnapshotTiled : public SourceSurface {
 public:
  SnapshotTiled(const std::vector<TileInternal>& aTiles, const IntRect& aRect)
      : mRect(aRect) {
    for (size_t i = 0; i < aTiles.size(); i++) {
      mSnapshots.push_back(aTiles[i].mDrawTarget->Snapshot());
      mOrigins.push_back(aTiles[i].mTileOrigin);
    }
  }

  SurfaceType GetType() const override { return SurfaceType::TILED; }
  IntSize GetSize() const override {
    MOZ_ASSERT(mRect.Width() > 0 && mRect.Height() > 0);
    return IntSize(mRect.XMost(), mRect.YMost());
  }
  IntRect GetRect() const override { return mRect; }
  SurfaceFormat GetFormat() const override {
    return mSnapshots[0]->GetFormat();
  }

  already_AddRefed<DataSourceSurface> GetDataSurface() override {
    RefPtr<DataSourceSurface> surf =
        Factory::CreateDataSourceSurface(mRect.Size(), GetFormat());
    if (!surf) {
      gfxCriticalError()
          << "DrawTargetTiled::GetDataSurface failed to allocate surface";
      return nullptr;
    }

    DataSourceSurface::MappedSurface mappedSurf;
    if (!surf->Map(DataSourceSurface::MapType::WRITE, &mappedSurf)) {
      gfxCriticalError()
          << "DrawTargetTiled::GetDataSurface failed to map surface";
      return nullptr;
    }

    {
      RefPtr<DrawTarget> dt = Factory::CreateDrawTargetForData(
          BackendType::CAIRO, mappedSurf.mData, mRect.Size(),
          mappedSurf.mStride, GetFormat());

      if (!dt) {
        gfxWarning() << "DrawTargetTiled::GetDataSurface failed in "
                        "CreateDrawTargetForData";
        surf->Unmap();
        return nullptr;
      }
      for (size_t i = 0; i < mSnapshots.size(); i++) {
        RefPtr<DataSourceSurface> dataSurf = mSnapshots[i]->GetDataSurface();
        dt->CopySurface(dataSurf,
                        IntRect(IntPoint(0, 0), mSnapshots[i]->GetSize()),
                        mOrigins[i] - mRect.TopLeft());
      }
    }
    surf->Unmap();

    return surf.forget();
  }

  std::vector<RefPtr<SourceSurface>> mSnapshots;
  std::vector<IntPoint> mOrigins;
  IntRect mRect;
};

}  // namespace gfx
}  // namespace mozilla

#endif