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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.
*/
#include "SkClipStack.h"
#include "SkTLList.h"
namespace GrReducedClip {
typedef SkTLList<SkClipStack::Element> 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
* initial state of the query rectangle before the first clip element is applied is returned via
* initialState. Optionally, the caller can request a tighter bounds on the clip be returned via
* tighterBounds. If not NULL, tighterBounds will always be contained by queryBounds after return.
* If tighterBounds is specified then it is assumed that the caller will implicitly clip against it.
* If the caller specifies non-NULL for requiresAA then it will indicate whether anti-aliasing is
* required to process any of the elements in the result.
*
* This may become a member function of SkClipStack when its interface is determined to be stable.
*/
void ReduceClipStack(const SkClipStack& stack,
const SkIRect& queryBounds,
ElementList* result,
InitialState* initialState,
SkIRect* tighterBounds = NULL,
bool* requiresAA = NULL);
} // namespace GrReducedClip
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