e3beb6bd7d
This is mostly s/public SkNoncopyable/SkNoncopyable/g. Two classes (SkDrawLooper::Context and SkPicture::OperationList) don't actually work with SkNoncopyable because they introduce a virtual destructor. I added SkNoncopyableVirtual to make them work as intended. Sort of questionable whether they really need to be noncopyable in the first place, but I guess it doesn't hurt to keep the behavior the same. BUG=skia: R=reed@google.com, mtklein@google.com Author: mtklein@chromium.org Review URL: https://codereview.chromium.org/226183018 git-svn-id: http://skia.googlecode.com/svn/trunk@14081 2bbb7eff-a529-9590-31e7-b0007b416f81
103 lines
3.7 KiB
C++
103 lines
3.7 KiB
C++
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/*
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* Copyright 2011 The Android Open Source Project
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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 SkDrawLooper_DEFINED
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#define SkDrawLooper_DEFINED
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#include "SkFlattenable.h"
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class SkCanvas;
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class SkPaint;
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struct SkRect;
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class SkString;
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/** \class SkDrawLooper
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Subclasses of SkDrawLooper can be attached to a SkPaint. Where they are,
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and something is drawn to a canvas with that paint, the looper subclass will
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be called, allowing it to modify the canvas and/or paint for that draw call.
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More than that, via the next() method, the looper can modify the draw to be
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invoked multiple times (hence the name loop-er), allow it to perform effects
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like shadows or frame/fills, that require more than one pass.
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*/
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class SK_API SkDrawLooper : public SkFlattenable {
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public:
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SK_DECLARE_INST_COUNT(SkDrawLooper)
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/**
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* Holds state during a draw. Users call next() until it returns false.
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*
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* Subclasses of SkDrawLooper should create a subclass of this object to
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* hold state specific to their subclass.
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*/
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class SK_API Context : ::SkNoncopyable {
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public:
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Context() {}
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virtual ~Context() {}
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/**
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* Called in a loop on objects returned by SkDrawLooper::createContext().
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* Each time true is returned, the object is drawn (possibly with a modified
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* canvas and/or paint). When false is finally returned, drawing for the object
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* stops.
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*
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* On each call, the paint will be in its original state, but the
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* canvas will be as it was following the previous call to next() or
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* createContext().
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*
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* The implementation must ensure that, when next() finally returns
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* false, the canvas has been restored to the state it was
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* initially, before createContext() was first called.
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*/
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virtual bool next(SkCanvas* canvas, SkPaint* paint) = 0;
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};
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/**
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* Called right before something is being drawn. Returns a Context
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* whose next() method should be called until it returns false.
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* The caller has to ensure that the storage pointer provides enough
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* memory for the Context. The required size can be queried by calling
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* contextSize(). It is also the caller's responsibility to destroy the
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* object after use.
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*/
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virtual Context* createContext(SkCanvas*, void* storage) const = 0;
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/**
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* Returns the number of bytes needed to store subclasses of Context (belonging to the
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* corresponding SkDrawLooper subclass).
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*/
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virtual size_t contextSize() const = 0;
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/**
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* The fast bounds functions are used to enable the paint to be culled early
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* in the drawing pipeline. If a subclass can support this feature it must
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* return true for the canComputeFastBounds() function. If that function
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* returns false then computeFastBounds behavior is undefined otherwise it
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* is expected to have the following behavior. Given the parent paint and
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* the parent's bounding rect the subclass must fill in and return the
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* storage rect, where the storage rect is with the union of the src rect
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* and the looper's bounding rect.
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*/
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virtual bool canComputeFastBounds(const SkPaint& paint) const;
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virtual void computeFastBounds(const SkPaint& paint,
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const SkRect& src, SkRect* dst) const;
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SK_TO_STRING_PUREVIRT()
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SK_DEFINE_FLATTENABLE_TYPE(SkDrawLooper)
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protected:
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SkDrawLooper() {}
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SkDrawLooper(SkReadBuffer& buffer) : INHERITED(buffer) {}
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private:
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typedef SkFlattenable INHERITED;
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};
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#endif
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