text: 
  /*
   * Copyright 2012 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  #ifndef SKDRAWCOMMAND_H_
  #define SKDRAWCOMMAND_H_
  
  #include "SkPictureFlat.h"
  #include "SkCanvas.h"
  #include "SkString.h"
  
  class SK_API SkDrawCommand {
  public:
      /* TODO(chudy): Remove subclasses. */
      SkDrawCommand(DrawType drawType);
      SkDrawCommand();
  
      virtual ~SkDrawCommand();
  
      virtual SkString toString();
  
      virtual const char* toCString() {
          return GetCommandString(fDrawType);
      }
  
      bool isVisible() const {
          return fVisible;
      }
  
      void setVisible(bool toggle) {
          fVisible = toggle;
      }
  
      SkTDArray<SkString*>* Info() {return &fInfo; };
      virtual void execute(SkCanvas* canvas)=0;
      /** Does nothing by default, but used by save() and restore()-type
          subclassse to track unresolved save() calls. */
      virtual void trackSaveState(int* state) { };
      DrawType getType() { return fDrawType; };
  
      virtual bool render(SkCanvas* canvas) const { return false; }
  
      static const char* GetCommandString(DrawType type);
  
  protected:
      DrawType fDrawType;
      SkTDArray<SkString*> fInfo;
  
  private:
      bool fVisible;
  };
  
  class SkRestoreCommand : public SkDrawCommand {
  public:
      SkRestoreCommand();
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual void trackSaveState(int* state) SK_OVERRIDE;
  
  private:
      typedef SkDrawCommand INHERITED;
  };
  
  class SkClearCommand : public SkDrawCommand {
  public:
      SkClearCommand(SkColor color);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      SkColor fColor;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkClipPathCommand : public SkDrawCommand {
  public:
      SkClipPathCommand(const SkPath& path, SkRegion::Op op, bool doAA);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  private:
      SkPath       fPath;
      SkRegion::Op fOp;
      bool         fDoAA;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkClipRegionCommand : public SkDrawCommand {
  public:
      SkClipRegionCommand(const SkRegion& region, SkRegion::Op op);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      SkRegion     fRegion;
      SkRegion::Op fOp;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkClipRectCommand : public SkDrawCommand {
  public:
      SkClipRectCommand(const SkRect& rect, SkRegion::Op op, bool doAA);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  
      const SkRect& rect() const { return fRect; }
      SkRegion::Op op() const { return fOp; }
      bool doAA() const { return fDoAA; }
  
  private:
      SkRect       fRect;
      SkRegion::Op fOp;
      bool         fDoAA;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkClipRRectCommand : public SkDrawCommand {
  public:
      SkClipRRectCommand(const SkRRect& rrect, SkRegion::Op op, bool doAA);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  
      const SkRRect& rrect() const { return fRRect; }
      SkRegion::Op op() const { return fOp; }
      bool doAA() const { return fDoAA; }
  
  private:
      SkRRect      fRRect;
      SkRegion::Op fOp;
      bool         fDoAA;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkConcatCommand : public SkDrawCommand {
  public:
      SkConcatCommand(const SkMatrix& matrix);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      SkMatrix fMatrix;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawBitmapCommand : public SkDrawCommand {
  public:
      SkDrawBitmapCommand(const SkBitmap& bitmap, SkScalar left, SkScalar top,
                 const SkPaint* paint);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  private:
      SkBitmap fBitmap;
      SkScalar fLeft;
      SkScalar fTop;
      SkPaint  fPaint;
      SkPaint* fPaintPtr;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawBitmapMatrixCommand : public SkDrawCommand {
  public:
      SkDrawBitmapMatrixCommand(const SkBitmap& bitmap, const SkMatrix& matrix,
                       const SkPaint* paint);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  private:
      SkBitmap fBitmap;
      SkMatrix fMatrix;
      SkPaint  fPaint;
      SkPaint* fPaintPtr;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawBitmapNineCommand : public SkDrawCommand {
  public:
      SkDrawBitmapNineCommand(const SkBitmap& bitmap, const SkIRect& center,
                     const SkRect& dst, const SkPaint* paint);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  private:
      SkBitmap fBitmap;
      SkIRect  fCenter;
      SkRect   fDst;
      SkPaint  fPaint;
      SkPaint* fPaintPtr;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawBitmapRectCommand : public SkDrawCommand {
  public:
      SkDrawBitmapRectCommand(const SkBitmap& bitmap, const SkRect* src,
                              const SkRect& dst, const SkPaint* paint,
                              SkCanvas::DrawBitmapRectFlags flags);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  
      const SkBitmap& bitmap() const { return fBitmap; }
  
      // The non-const 'paint' method allows modification of this object's
      // SkPaint. For this reason the ctor and setPaint method make a local copy.
      // The 'fPaintPtr' member acts a signal that the local SkPaint is valid
      // (since only an SkPaint* is passed into the ctor).
      const SkPaint* paint() const { return fPaintPtr; }
      SkPaint* paint() { return fPaintPtr; }
  
      void setPaint(const SkPaint& paint) { fPaint = paint; fPaintPtr = &fPaint; }
  
      const SkRect* srcRect() const { return fSrc.isEmpty() ? NULL : &fSrc; }
      void setSrcRect(const SkRect& src) { fSrc = src; }
  
      const SkRect& dstRect() const { return fDst; }
      void setDstRect(const SkRect& dst) { fDst = dst; }
  
      SkCanvas::DrawBitmapRectFlags flags() const { return fFlags; }
      void setFlags(SkCanvas::DrawBitmapRectFlags flags) { fFlags = flags; }
  
  private:
      SkBitmap                      fBitmap;
      SkRect                        fSrc;
      SkRect                        fDst;
      SkPaint                       fPaint;
      SkPaint*                      fPaintPtr;
      SkCanvas::DrawBitmapRectFlags fFlags;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawDataCommand : public SkDrawCommand {
  public:
      SkDrawDataCommand(const void* data, size_t length);
      virtual ~SkDrawDataCommand() { delete [] fData; }
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      char*  fData;
      size_t fLength;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkBeginCommentGroupCommand : public SkDrawCommand {
  public:
      SkBeginCommentGroupCommand(const char* description);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE {
          canvas->beginCommentGroup(fDescription.c_str());
      };
  private:
      SkString fDescription;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkCommentCommand : public SkDrawCommand {
  public:
      SkCommentCommand(const char* kywd, const char* value);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE {
          canvas->addComment(fKywd.c_str(), fValue.c_str());
      };
  private:
      SkString fKywd;
      SkString fValue;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkEndCommentGroupCommand : public SkDrawCommand {
  public:
      SkEndCommentGroupCommand();
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE {
          canvas->endCommentGroup();
      };
  private:
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawOvalCommand : public SkDrawCommand {
  public:
      SkDrawOvalCommand(const SkRect& oval, const SkPaint& paint);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  private:
      SkRect  fOval;
      SkPaint fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawPaintCommand : public SkDrawCommand {
  public:
      SkDrawPaintCommand(const SkPaint& paint);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  private:
      SkPaint fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawPathCommand : public SkDrawCommand {
  public:
      SkDrawPathCommand(const SkPath& path, const SkPaint& paint);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  
  private:
      SkPath   fPath;
      SkPaint  fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawPictureCommand : public SkDrawCommand {
  public:
      SkDrawPictureCommand(SkPicture& picture);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  
  private:
      SkPicture fPicture;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawPointsCommand : public SkDrawCommand {
  public:
      SkDrawPointsCommand(SkCanvas::PointMode mode, size_t count, const SkPoint pts[],
                 const SkPaint& paint);
      virtual ~SkDrawPointsCommand() { delete [] fPts; }
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  private:
      SkCanvas::PointMode fMode;
      size_t              fCount;
      SkPoint*            fPts;
      SkPaint             fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawTextCommand : public SkDrawCommand {
  public:
      SkDrawTextCommand(const void* text, size_t byteLength, SkScalar x, SkScalar y,
                const SkPaint& paint);
      virtual ~SkDrawTextCommand() { delete [] fText; }
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      char*    fText;
      size_t   fByteLength;
      SkScalar fX;
      SkScalar fY;
      SkPaint  fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawPosTextCommand : public SkDrawCommand {
  public:
      SkDrawPosTextCommand(const void* text, size_t byteLength, const SkPoint pos[],
                           const SkPaint& paint);
      virtual ~SkDrawPosTextCommand() { delete [] fPos; delete [] fText; }
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      char*    fText;
      size_t   fByteLength;
      SkPoint* fPos;
      SkPaint  fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawTextOnPathCommand : public SkDrawCommand {
  public:
      SkDrawTextOnPathCommand(const void* text, size_t byteLength, const SkPath& path,
                              const SkMatrix* matrix, const SkPaint& paint);
      virtual ~SkDrawTextOnPathCommand() { delete [] fText; }
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      char*    fText;
      size_t   fByteLength;
      SkPath   fPath;
      SkMatrix fMatrix;
      SkPaint  fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawPosTextHCommand : public SkDrawCommand {
  public:
      SkDrawPosTextHCommand(const void* text, size_t byteLength, const SkScalar xpos[],
                            SkScalar constY, const SkPaint& paint);
      virtual ~SkDrawPosTextHCommand() { delete [] fXpos; delete [] fText; }
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      SkScalar* fXpos;
      char*     fText;
      size_t    fByteLength;
      SkScalar  fConstY;
      SkPaint   fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawRectCommand : public SkDrawCommand {
  public:
      SkDrawRectCommand(const SkRect& rect, const SkPaint& paint);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  
      const SkRect& rect() const   { return fRect; }
      const SkPaint& paint() const { return fPaint; }
  private:
      SkRect  fRect;
      SkPaint fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawRRectCommand : public SkDrawCommand {
  public:
      SkDrawRRectCommand(const SkRRect& rrect, const SkPaint& paint);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  private:
      SkRRect fRRect;
      SkPaint fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawSpriteCommand : public SkDrawCommand {
  public:
      SkDrawSpriteCommand(const SkBitmap& bitmap, int left, int top, const SkPaint* paint);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual bool render(SkCanvas* canvas) const SK_OVERRIDE;
  private:
      SkBitmap fBitmap;
      int      fLeft;
      int      fTop;
      SkPaint  fPaint;
      SkPaint* fPaintPtr;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkDrawVerticesCommand : public SkDrawCommand {
  public:
      SkDrawVerticesCommand(SkCanvas::VertexMode vmode, int vertexCount,
                            const SkPoint vertices[], const SkPoint texs[],
                            const SkColor colors[], SkXfermode* xfermode,
                            const uint16_t indices[], int indexCount,
                            const SkPaint& paint);
      virtual ~SkDrawVerticesCommand();
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      SkCanvas::VertexMode fVmode;
      int         fVertexCount;
      SkPoint*    fVertices;
      SkPoint*    fTexs;
      SkColor*    fColors;
      SkXfermode* fXfermode;
      uint16_t*   fIndices;
      int         fIndexCount;
      SkPaint     fPaint;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkRotateCommand : public SkDrawCommand {
  public:
      SkRotateCommand(SkScalar degrees);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      SkScalar fDegrees;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkSaveCommand : public SkDrawCommand {
  public:
      SkSaveCommand(SkCanvas::SaveFlags flags);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual void trackSaveState(int* state) SK_OVERRIDE;
  private:
      SkCanvas::SaveFlags fFlags;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkSaveLayerCommand : public SkDrawCommand {
  public:
      SkSaveLayerCommand(const SkRect* bounds, const SkPaint* paint,
                         SkCanvas::SaveFlags flags);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
      virtual void trackSaveState(int* state) SK_OVERRIDE;
  
      const SkPaint* paint() const { return fPaintPtr; }
  
  private:
      SkRect              fBounds;
      SkPaint             fPaint;
      SkPaint*            fPaintPtr;
      SkCanvas::SaveFlags fFlags;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkScaleCommand : public SkDrawCommand {
  public:
      SkScaleCommand(SkScalar sx, SkScalar sy);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  
      SkScalar x() const { return fSx; }
      SkScalar y() const { return fSy; }
  
  private:
      SkScalar fSx;
      SkScalar fSy;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkSetMatrixCommand : public SkDrawCommand {
  public:
      SkSetMatrixCommand(const SkMatrix& matrix);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      SkMatrix fMatrix;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkSkewCommand : public SkDrawCommand {
  public:
      SkSkewCommand(SkScalar sx, SkScalar sy);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  private:
      SkScalar fSx;
      SkScalar fSy;
  
      typedef SkDrawCommand INHERITED;
  };
  
  class SkTranslateCommand : public SkDrawCommand {
  public:
      SkTranslateCommand(SkScalar dx, SkScalar dy);
      virtual void execute(SkCanvas* canvas) SK_OVERRIDE;
  
      SkScalar x() const { return fDx; }
      SkScalar y() const { return fDy; }
  
  private:
      SkScalar fDx;
      SkScalar fDy;
  
      typedef SkDrawCommand INHERITED;
  };
  
  #endif
  