112 lines
4.6 KiB
C++
112 lines
4.6 KiB
C++
/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkPaintFilterCanvas_DEFINED
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#define SkPaintFilterCanvas_DEFINED
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#include "SkNWayCanvas.h"
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#include "SkTLazy.h"
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/** \class SkPaintFilterCanvas
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A utility proxy base class for implementing draw/paint filters.
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*/
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class SK_API SkPaintFilterCanvas : public SkNWayCanvas {
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public:
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/**
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* DEPRECATED: use the variant below.
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*/
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SkPaintFilterCanvas(int width, int height);
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/**
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* The new SkPaintFilterCanvas is configured for forwarding to the
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* specified canvas. Also copies the target canvas matrix and clip bounds.
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*/
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SkPaintFilterCanvas(SkCanvas* canvas);
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enum Type {
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kPaint_Type,
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kPoint_Type,
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kArc_Type,
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kBitmap_Type,
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kRect_Type,
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kRRect_Type,
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kDRRect_Type,
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kOval_Type,
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kPath_Type,
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kPicture_Type,
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kText_Type,
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kTextBlob_Type,
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kVertices_Type,
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kPatch_Type,
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kTypeCount
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};
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protected:
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/**
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* Called with the paint that will be used to draw the specified type.
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* The implementation may modify the paint as they wish (using SkTCopyOnFirstWrite::writable).
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*
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* The result bool is used to determine whether the draw op is to be
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* executed (true) or skipped (false).
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*
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* Note: The base implementation calls onFilter() for top-level/explicit paints only.
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* To also filter encapsulated paints (e.g. SkPicture, SkTextBlob), clients may need to
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* override the relevant methods (i.e. drawPicture, drawTextBlob).
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*/
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virtual bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type type) const = 0;
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void onDrawPaint(const SkPaint&) override;
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void onDrawPoints(PointMode, size_t count, const SkPoint pts[], const SkPaint&) override;
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void onDrawRect(const SkRect&, const SkPaint&) override;
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void onDrawRRect(const SkRRect&, const SkPaint&) override;
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void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override;
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void onDrawOval(const SkRect&, const SkPaint&) override;
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void onDrawArc(const SkRect&, SkScalar, SkScalar, bool, const SkPaint&) override;
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void onDrawPath(const SkPath&, const SkPaint&) override;
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void onDrawBitmap(const SkBitmap&, SkScalar left, SkScalar top, const SkPaint*) override;
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void onDrawBitmapRect(const SkBitmap&, const SkRect* src, const SkRect& dst, const SkPaint*,
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SrcRectConstraint) override;
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void onDrawBitmapNine(const SkBitmap&, const SkIRect& center, const SkRect& dst,
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const SkPaint*) override;
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void onDrawImage(const SkImage*, SkScalar left, SkScalar top, const SkPaint*) override;
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void onDrawImageRect(const SkImage*, const SkRect* src, const SkRect& dst,
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const SkPaint*, SrcRectConstraint) override;
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void onDrawImageNine(const SkImage*, const SkIRect& center, const SkRect& dst,
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const SkPaint*) override;
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void onDrawVertices(VertexMode vmode, int vertexCount,
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const SkPoint vertices[], const SkPoint texs[],
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const SkColor colors[], SkXfermode* xmode,
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const uint16_t indices[], int indexCount,
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const SkPaint&) override;
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void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
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const SkPoint texCoords[4], SkXfermode* xmode,
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const SkPaint& paint) override;
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void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override;
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void onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
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const SkPaint&) override;
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void onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
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const SkPaint&) override;
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void onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
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SkScalar constY, const SkPaint&) override;
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void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
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const SkMatrix* matrix, const SkPaint&) override;
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void onDrawTextRSXform(const void* text, size_t byteLength, const SkRSXform xform[],
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const SkRect* cull, const SkPaint& paint) override;
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void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
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const SkPaint& paint) override;
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private:
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class AutoPaintFilter;
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typedef SkNWayCanvas INHERITED;
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};
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#endif
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