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/*
* Copyright 2012 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"
class SK_API GrReducedClip {
public:
typedef SkTLList<SkClipStack::Element, 16> ElementList;
enum InitialState {
kAllIn_InitialState,
kAllOut_InitialState,
};
/**
* This function takes a clip stack and a query rectangle and it produces a
* reduced set of SkClipStack::Elements that are equivalent to applying the
* full stack to the rectangle. The clip stack generation id that represents
* the list of elements is returned in resultGenID. The initial state of the
* query rectangle before the first clip element is applied is returned via
* initialState. The reducer output tighterBounds is a tighter bounds on the
* clip. tighterBounds will always be contained by queryBounds after return.
* It is assumed that the caller will not draw outside of tighterBounds.
* The requiresAA output will indicate whether anti-aliasing is required to
* process any of the elements in the element list result.
*/
static void ReduceClipStack(const SkClipStack& stack,
const SkIRect& queryBounds,
ElementList* result,
int32_t* resultGenID,
InitialState* initialState,
SkIRect* tighterBounds,
bool* requiresAA);
};
#endif
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