skia2/include/utils/SkDumpCanvas.h

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#ifndef SkDumpCanvas_DEFINED
#define SkDumpCanvas_DEFINED

#include "SkCanvas.h"

#ifdef SK_DEVELOPER

/** This class overrides all the draw methods on SkCanvas, and formats them
    as text, and then sends that to a Dumper helper object.

    Typical use might be to dump a display list to a log file to see what is
    being drawn.
 */
class SkDumpCanvas : public SkCanvas {
public:
    class Dumper;

    explicit SkDumpCanvas(Dumper* = 0);
    virtual ~SkDumpCanvas();

    enum Verb {
        kNULL_Verb,

        kSave_Verb,
        kRestore_Verb,

        kMatrix_Verb,

        kClip_Verb,

        kDrawPaint_Verb,
        kDrawPoints_Verb,
        kDrawOval_Verb,
        kDrawRect_Verb,
        kDrawRRect_Verb,
        kDrawDRRect_Verb,
        kDrawPath_Verb,
        kDrawBitmap_Verb,
        kDrawText_Verb,
        kDrawPicture_Verb,
        kDrawVertices_Verb,
        kDrawPatch_Verb,
        kDrawData_Verb, // obsolete

        kCull_Verb
    };

    /** Subclasses of this are installed on the DumpCanvas, and then called for
        each drawing command.
     */
    class Dumper : public SkRefCnt {
    public:
        SK_DECLARE_INST_COUNT(Dumper)

        virtual void dump(SkDumpCanvas*, SkDumpCanvas::Verb, const char str[],
                          const SkPaint*) = 0;

    private:
        typedef SkRefCnt INHERITED;
    };

    Dumper* getDumper() const { return fDumper; }
    void    setDumper(Dumper*);

    int getNestLevel() const { return fNestLevel; }

protected:
    void willSave() override;
    SaveLayerStrategy willSaveLayer(const SkRect*, const SkPaint*, SaveFlags) override;
    void willRestore() override;

    void didConcat(const SkMatrix&) override;
    void didSetMatrix(const SkMatrix&) override;

    void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override;
    virtual void onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
                            const SkPaint&) override;
    virtual void onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
                               const SkPaint&) override;
    virtual void onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
                                SkScalar constY, const SkPaint&) override;
    virtual void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
                                  const SkMatrix* matrix, const SkPaint&) override;
    virtual void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
                                const SkPaint& paint) override;
    virtual void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
                             const SkPoint texCoords[4], SkXfermode* xmode,
                             const SkPaint& paint) override;

    void onDrawPaint(const SkPaint&) override;
    void onDrawPoints(PointMode, size_t count, const SkPoint pts[], const SkPaint&) override;
    void onDrawRect(const SkRect&, const SkPaint&) override;
    void onDrawOval(const SkRect&, const SkPaint&) override;
    void onDrawRRect(const SkRRect&, const SkPaint&) override;
    void onDrawPath(const SkPath&, const SkPaint&) override;
    void onDrawBitmap(const SkBitmap&, SkScalar left, SkScalar top, const SkPaint*) override;
    void onDrawBitmapRect(const SkBitmap&, const SkRect* src, const SkRect& dst, const SkPaint*,
                          DrawBitmapRectFlags flags) override;
    void onDrawImage(const SkImage*, SkScalar left, SkScalar top, const SkPaint*) override;
    void onDrawImageRect(const SkImage*, const SkRect* src, const SkRect& dst,
                         const SkPaint*) override;
    void onDrawBitmapNine(const SkBitmap&, const SkIRect& center, const SkRect& dst,
                          const SkPaint*) override;
    void onDrawSprite(const SkBitmap&, int left, int top, const SkPaint*) override;
    void onDrawVertices(VertexMode vmode, int vertexCount,
                        const SkPoint vertices[], const SkPoint texs[],
                        const SkColor colors[], SkXfermode* xmode,
                        const uint16_t indices[], int indexCount,
                        const SkPaint&) override;

    void onClipRect(const SkRect&, SkRegion::Op, ClipEdgeStyle) override;
    void onClipRRect(const SkRRect&, SkRegion::Op, ClipEdgeStyle) override;
    void onClipPath(const SkPath&, SkRegion::Op, ClipEdgeStyle) override;
    void onClipRegion(const SkRegion&, SkRegion::Op) override;

    void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override;

    static const char* EdgeStyleToAAString(ClipEdgeStyle edgeStyle);

private:
    Dumper* fDumper;
    int     fNestLevel; // for nesting recursive elements like pictures

    void dump(Verb, const SkPaint*, const char format[], ...);

    typedef SkCanvas INHERITED;
};

/** Formats the draw commands, and send them to a function-pointer provided
    by the caller.
 */
class SkFormatDumper : public SkDumpCanvas::Dumper {
public:
    SkFormatDumper(void (*)(const char text[], void* refcon), void* refcon);

    // override from baseclass that does the formatting, and in turn calls
    // the function pointer that was passed to the constructor
    virtual void dump(SkDumpCanvas*, SkDumpCanvas::Verb, const char str[],
                      const SkPaint*) override;

private:
    void (*fProc)(const char*, void*);
    void* fRefcon;

    typedef SkDumpCanvas::Dumper INHERITED;
};

/** Subclass of Dumper that dumps the drawing command to SkDebugf
 */
class SkDebugfDumper : public SkFormatDumper {
public:
    SkDebugfDumper();

private:
    typedef SkFormatDumper INHERITED;
};

#endif

#endif