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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPaintFilterCanvas_DEFINED
#define SkPaintFilterCanvas_DEFINED
#include "SkNWayCanvas.h"
#include "SkTLazy.h"
/** \class SkPaintFilterCanvas
A utility proxy base class for implementing draw/paint filters.
*/
class SK_API SkPaintFilterCanvas : public SkNWayCanvas {
public:
/**
* The new SkPaintFilterCanvas is configured for forwarding to the
* specified canvas. Also copies the target canvas matrix and clip bounds.
*/
SkPaintFilterCanvas(SkCanvas* canvas);
enum Type {
kPaint_Type,
kPoint_Type,
kArc_Type,
kBitmap_Type,
kRect_Type,
kRRect_Type,
kDRRect_Type,
kOval_Type,
kPath_Type,
kPicture_Type,
kDrawable_Type,
kText_Type,
kTextBlob_Type,
kVertices_Type,
kPatch_Type,
kTypeCount
};
// Forwarded to the wrapped canvas.
SkISize getBaseLayerSize() const override { return proxy()->getBaseLayerSize(); }
GrContext* getGrContext() override { return proxy()->getGrContext(); }
protected:
/**
* Called with the paint that will be used to draw the specified type.
* The implementation may modify the paint as they wish (using SkTCopyOnFirstWrite::writable).
*
* The result bool is used to determine whether the draw op is to be
* executed (true) or skipped (false).
*
* Note: The base implementation calls onFilter() for top-level/explicit paints only.
* To also filter encapsulated paints (e.g. SkPicture, SkTextBlob), clients may need to
* override the relevant methods (i.e. drawPicture, drawTextBlob).
*/
virtual bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type type) const = 0;
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 onDrawRRect(const SkRRect&, const SkPaint&) override;
void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override;
void onDrawOval(const SkRect&, const SkPaint&) override;
void onDrawArc(const SkRect&, SkScalar, SkScalar, bool, 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*,
SrcRectConstraint) override;
void onDrawBitmapNine(const SkBitmap&, const SkIRect& center, const SkRect& dst,
const SkPaint*) override;
void onDrawImage(const SkImage*, SkScalar left, SkScalar top, const SkPaint*) override;
void onDrawImageRect(const SkImage*, const SkRect* src, const SkRect& dst,
const SkPaint*, SrcRectConstraint) override;
void onDrawImageNine(const SkImage*, const SkIRect& center, const SkRect& dst,
const SkPaint*) override;
void onDrawVerticesObject(const SkVertices*, SkBlendMode, const SkPaint&) override;
void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
const SkPoint texCoords[4], SkBlendMode,
const SkPaint& paint) override;
void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override;
void onDrawDrawable(SkDrawable*, const SkMatrix*) override;
void onDrawText(const void* text, size_t byteLength, SkScalar x, SkScalar y,
const SkPaint&) override;
void onDrawPosText(const void* text, size_t byteLength, const SkPoint pos[],
const SkPaint&) override;
void onDrawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[],
SkScalar constY, const SkPaint&) override;
void onDrawTextOnPath(const void* text, size_t byteLength, const SkPath& path,
const SkMatrix* matrix, const SkPaint&) override;
void onDrawTextRSXform(const void* text, size_t byteLength, const SkRSXform xform[],
const SkRect* cull, const SkPaint& paint) override;
void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
const SkPaint& paint) override;
// Forwarded to the wrapped canvas.
sk_sp<SkSurface> onNewSurface(const SkImageInfo&, const SkSurfaceProps&) override;
bool onPeekPixels(SkPixmap* pixmap) override;
bool onAccessTopLayerPixels(SkPixmap* pixmap) override;
SkImageInfo onImageInfo() const override;
bool onGetProps(SkSurfaceProps* props) const override;
private:
class AutoPaintFilter;
SkCanvas* proxy() const { SkASSERT(fList.count() == 1); return fList[0]; }
typedef SkNWayCanvas INHERITED;
};
#endif
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