/* -*- 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_DRAWTARGETWRAPANDRECORD_H_

#define MOZILLA_GFX_DRAWTARGETWRAPANDRECORD_H_

#include "2D.h"

#include "DrawEventRecorder.h"

namespace mozilla {

namespace gfx {

class DrawTargetWrapAndRecord : public DrawTarget

{

public:

  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(DrawTargetWrapAndRecord, override)

  DrawTargetWrapAndRecord(DrawEventRecorder *aRecorder, DrawTarget *aDT, bool aHasData = false);

  ~DrawTargetWrapAndRecord();

  virtual DrawTargetType GetType() const override { return mFinalDT->GetType(); }

  virtual BackendType GetBackendType() const override { return mFinalDT->GetBackendType(); }

  virtual bool IsRecording() const override { return true; }

  virtual already_AddRefed<SourceSurface> Snapshot() override;

  virtual already_AddRefed<SourceSurface> IntoLuminanceSource(LuminanceType aLuminanceType, float aOpacity) override;

  virtual void DetachAllSnapshots() override;

  virtual IntSize GetSize() const override { return mFinalDT->GetSize(); }

  /* Ensure that the DrawTarget backend has flushed all drawing operations to

   * this draw target. This must be called before using the backing surface of

   * this draw target outside of GFX 2D code.

   */

  virtual void Flush() override { mFinalDT->Flush(); }

  /*

   * Draw a surface to the draw target. Possibly doing partial drawing or

   * applying scaling. No sampling happens outside the source.

   *

   * aSurface Source surface to draw

   * aDest Destination rectangle that this drawing operation should draw to

   * aSource Source rectangle in aSurface coordinates, this area of aSurface

   *         will be stretched to the size of aDest.

   * aOptions General draw options that are applied to the operation

   * aSurfOptions DrawSurface options that are applied

   */

  virtual void DrawSurface(SourceSurface *aSurface,

                           const Rect &aDest,

                           const Rect &aSource,

                           const DrawSurfaceOptions &aSurfOptions = DrawSurfaceOptions(),

                           const DrawOptions &aOptions = DrawOptions()) override;

  virtual void DrawFilter(FilterNode *aNode,

                          const Rect &aSourceRect,

                          const Point &aDestPoint,

                          const DrawOptions &aOptions = DrawOptions()) override;

  /*

   * Blend a surface to the draw target with a shadow. The shadow is drawn as a

   * gaussian blur using a specified sigma. The shadow is clipped to the size

   * of the input surface, so the input surface should contain a transparent

   * border the size of the approximate coverage of the blur (3 * aSigma).

   * NOTE: This function works in device space!

   *

   * aSurface Source surface to draw.

   * aDest Destination point that this drawing operation should draw to.

   * aColor Color of the drawn shadow

   * aOffset Offset of the shadow

   * aSigma Sigma used for the guassian filter kernel

   * aOperator Composition operator used

   */

  virtual void DrawSurfaceWithShadow(SourceSurface *aSurface,

                                     const Point &aDest,

                                     const Color &aColor,

                                     const Point &aOffset,

                                     Float aSigma,

                                     CompositionOp aOperator) override;

  /* 

   * Clear a rectangle on the draw target to transparent black. This will

   * respect the clipping region and transform.

   *

   * aRect Rectangle to clear

   */

  virtual void ClearRect(const Rect &aRect) override;

  /*

   * This is essentially a 'memcpy' between two surfaces. It moves a pixel

   * aligned area from the source surface unscaled directly onto the

   * drawtarget. This ignores both transform and clip.

   *

   * aSurface Surface to copy from

   * aSourceRect Source rectangle to be copied

   * aDest Destination point to copy the surface to

   */

  virtual void CopySurface(SourceSurface *aSurface,

                           const IntRect &aSourceRect,

                           const IntPoint &aDestination) override;

  /*

   * Fill a rectangle on the DrawTarget with a certain source pattern.

   *

   * aRect Rectangle that forms the mask of this filling operation

   * aPattern Pattern that forms the source of this filling operation

   * aOptions Options that are applied to this operation

   */

  virtual void FillRect(const Rect &aRect,

                        const Pattern &aPattern,

                        const DrawOptions &aOptions = DrawOptions()) override;

  /*

   * Stroke a rectangle on the DrawTarget with a certain source pattern.

   *

   * aRect Rectangle that forms the mask of this stroking operation

   * aPattern Pattern that forms the source of this stroking operation

   * aOptions Options that are applied to this operation

   */

  virtual void StrokeRect(const Rect &aRect,

                          const Pattern &aPattern,

                          const StrokeOptions &aStrokeOptions = StrokeOptions(),

                          const DrawOptions &aOptions = DrawOptions()) override;

  /*

   * Stroke a line on the DrawTarget with a certain source pattern.

   *

   * aStart Starting point of the line

   * aEnd End point of the line

   * aPattern Pattern that forms the source of this stroking operation

   * aOptions Options that are applied to this operation

   */

  virtual void StrokeLine(const Point &aStart,

                          const Point &aEnd,

                          const Pattern &aPattern,

                          const StrokeOptions &aStrokeOptions = StrokeOptions(),

                          const DrawOptions &aOptions = DrawOptions()) override;

  /*

   * Stroke a path on the draw target with a certain source pattern.

   *

   * aPath Path that is to be stroked

   * aPattern Pattern that should be used for the stroke

   * aStrokeOptions Stroke options used for this operation

   * aOptions Draw options used for this operation

   */

  virtual void Stroke(const Path *aPath,

                      const Pattern &aPattern,

                      const StrokeOptions &aStrokeOptions = StrokeOptions(),

                      const DrawOptions &aOptions = DrawOptions()) override;

  /*

   * Fill a path on the draw target with a certain source pattern.

   *

   * aPath Path that is to be filled

   * aPattern Pattern that should be used for the fill

   * aOptions Draw options used for this operation

   */

  virtual void Fill(const Path *aPath,

                    const Pattern &aPattern,

                    const DrawOptions &aOptions = DrawOptions()) override;

  /*

   * Fill a series of clyphs on the draw target with a certain source pattern.

   */

  virtual void FillGlyphs(ScaledFont *aFont,

                          const GlyphBuffer &aBuffer,

                          const Pattern &aPattern,

                          const DrawOptions &aOptions = DrawOptions()) override;

  /*

   * This takes a source pattern and a mask, and composites the source pattern

   * onto the destination surface using the alpha channel of the mask pattern

   * as a mask for the operation.

   *

   * aSource Source pattern

   * aMask Mask pattern

   * aOptions Drawing options

   */

  virtual void Mask(const Pattern &aSource,

                    const Pattern &aMask,

                    const DrawOptions &aOptions = DrawOptions()) override;

  virtual void MaskSurface(const Pattern &aSource,

                           SourceSurface *aMask,

                           Point aOffset,

                           const DrawOptions &aOptions = DrawOptions()) override;

  /*

   * Push a clip to the DrawTarget.

   *

   * aPath The path to clip to

   */

  virtual void PushClip(const Path *aPath) override;

  /*

   * Push an axis-aligned rectangular clip to the DrawTarget. This rectangle

   * is specified in user space.

   *

   * aRect The rect to clip to

   */

  virtual void PushClipRect(const Rect &aRect) override;

  /* Pop a clip from the DrawTarget. A pop without a corresponding push will

   * be ignored.

   */

  virtual void PopClip() override;

  /**

   * Push a 'layer' to the DrawTarget, a layer is a temporary surface that all

   * drawing will be redirected to, this is used for example to support group

   * opacity or the masking of groups. Clips must be balanced within a layer,

   * i.e. between a matching PushLayer/PopLayer pair there must be as many

   * PushClip(Rect) calls as there are PopClip calls.

   *

   * @param aOpaque Whether the layer will be opaque

   * @param aOpacity Opacity of the layer

   * @param aMask Mask applied to the layer

   * @param aMaskTransform Transform applied to the layer mask

   * @param aBounds Optional bounds in device space to which the layer is

   *                limited in size.

   * @param aCopyBackground Whether to copy the background into the layer, this

   *                        is only supported when aOpaque is true.

   */

  virtual void PushLayer(bool aOpaque, Float aOpacity,

                         SourceSurface* aMask,

                         const Matrix& aMaskTransform,

                         const IntRect& aBounds = IntRect(),

                         bool aCopyBackground = false) override;

  /**

   * This balances a call to PushLayer and proceeds to blend the layer back

   * onto the background. This blend will blend the temporary surface back

   * onto the target in device space using POINT sampling and operator over.

   */

  virtual void PopLayer() override;

  /*

   * Create a SourceSurface optimized for use with this DrawTarget from

   * existing bitmap data in memory.

   *

   * The SourceSurface does not take ownership of aData, and may be freed at any time.

   */

  virtual already_AddRefed<SourceSurface> CreateSourceSurfaceFromData(unsigned char *aData,

                                                                  const IntSize &aSize,

                                                                  int32_t aStride,

                                                                  SurfaceFormat aFormat) const override;

  /*

   * Create a SourceSurface optimized for use with this DrawTarget from

   * an arbitrary other SourceSurface. This may return aSourceSurface or some

   * other existing surface.

   */

  virtual already_AddRefed<SourceSurface> OptimizeSourceSurface(SourceSurface *aSurface) const override;

  /*

   * Create a SourceSurface for a type of NativeSurface. This may fail if the

   * draw target does not know how to deal with the type of NativeSurface passed

   * in.

   */

  virtual already_AddRefed<SourceSurface>

    CreateSourceSurfaceFromNativeSurface(const NativeSurface &aSurface) const override;

  /*

   * Create a DrawTarget whose snapshot is optimized for use with this DrawTarget.

   */

  virtual already_AddRefed<DrawTarget>

    CreateSimilarDrawTarget(const IntSize &aSize, SurfaceFormat aFormat) const override;

  /*

   * Create a path builder with the specified fillmode.

   *

   * We need the fill mode up front because of Direct2D.

   * ID2D1SimplifiedGeometrySink requires the fill mode

   * to be set before calling BeginFigure().

   */

  virtual already_AddRefed<PathBuilder> CreatePathBuilder(FillRule aFillRule = FillRule::FILL_WINDING) const override;

  /*

   * Create a GradientStops object that holds information about a set of

   * gradient stops, this object is required for linear or radial gradient

   * patterns to represent the color stops in the gradient.

   *

   * aStops An array of gradient stops

   * aNumStops Number of stops in the array aStops

   * aExtendNone This describes how to extend the stop color outside of the

   *             gradient area.

   */

  virtual already_AddRefed<GradientStops>

    CreateGradientStops(GradientStop *aStops,

                        uint32_t aNumStops,

                        ExtendMode aExtendMode = ExtendMode::CLAMP) const override;

  virtual already_AddRefed<FilterNode> CreateFilter(FilterType aType) override;

  /*

   * Set a transform on the surface, this transform is applied at drawing time

   * to both the mask and source of the operation.

   */

  virtual void SetTransform(const Matrix &aTransform) override;

  /* Tries to get a native surface for a DrawTarget, this may fail if the

   * draw target cannot convert to this surface type.

   */

  virtual void *GetNativeSurface(NativeSurfaceType aType) override { return mFinalDT->GetNativeSurface(aType); }

  virtual bool IsCurrentGroupOpaque() override {

    return mFinalDT->IsCurrentGroupOpaque();

  }

private:

  /**

   * Used for creating a DrawTargetWrapAndRecord for a CreateSimilarDrawTarget call.

   * We have to call CreateSimilarDrawTarget on mFinalDT up front and pass it in

   * as it can fail.

   *

   * @param aDT DrawTargetWrapAndRecord on which CreateSimilarDrawTarget was called

   * @param aSimilarDT Similar DrawTarget created from aDT.mFinalDT.

   */

  DrawTargetWrapAndRecord(const DrawTargetWrapAndRecord *aDT,

                      DrawTarget *aSimilarDT);

  Path *GetPathForPathRecording(const Path *aPath) const;

  already_AddRefed<PathRecording> EnsurePathStored(const Path *aPath);

  void EnsurePatternDependenciesStored(const Pattern &aPattern);

  RefPtr<DrawEventRecorderPrivate> mRecorder;

  RefPtr<DrawTarget> mFinalDT;

};

} // namespace gfx

} // namespace mozilla

#endif /* MOZILLA_GFX_DRAWTARGETWRAPANDRECORD_H_ */