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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrReducedClip_DEFINED
#define GrReducedClip_DEFINED
#include "SkClipStack.h"
#include "SkTLList.h"
/**
* This class takes a clip stack and produces a reduced set of elements that are equivalent to
* applying that full stack within a specified query rectangle.
*/
class SK_API GrReducedClip {
public:
GrReducedClip(const SkClipStack& stack, const SkRect& queryBounds);
/**
* If hasIBounds() is true, this is the bounding box within which the reduced clip is valid, and
* the caller must not modify any pixels outside this box. Undefined if hasIBounds() is false.
*/
const SkIRect& ibounds() const { SkASSERT(fHasIBounds); return fIBounds; }
int left() const { return this->ibounds().left(); }
int top() const { return this->ibounds().top(); }
int width() const { return this->ibounds().width(); }
int height() const { return this->ibounds().height(); }
/**
* Indicates whether ibounds() are defined. They will always be defined if the elements() are
* nonempty.
*/
bool hasIBounds() const { return fHasIBounds; }
typedef SkTLList<SkClipStack::Element, 16> ElementList;
/**
* Populated with a minimal list of elements that implement the clip.
*/
const ElementList& elements() const { return fElements; }
/**
* If elements() are nonempty, uniquely identifies the list of elements within ibounds().
* Otherwise undefined.
*/
int32_t elementsGenID() const { SkASSERT(!fElements.isEmpty()); return fElementsGenID; }
/**
* Indicates whether antialiasing is required to process any of the clip elements.
*/
bool requiresAA() const { return fRequiresAA; }
enum class InitialState : bool {
kAllIn,
kAllOut
};
InitialState initialState() const { return fInitialState; }
private:
void walkStack(const SkClipStack&, const SkRect& queryBounds);
bool intersectIBounds(const SkIRect&);
SkIRect fIBounds;
bool fHasIBounds;
ElementList fElements;
int32_t fElementsGenID;
bool fRequiresAA;
InitialState fInitialState;
};
#endif
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