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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 produces a reduced set of SkClipStack::Elements that are equivalent to applying
* a full clip stack within a specified query rectangle.
*
* @param stack the clip stack to reduce.
* @param queryBounds bounding box of geometry the stack will clip.
* @param result populated with a minimal list of elements that implement the clip
* within the provided query bounds.
* @param resultGenID uniquely identifies the resulting reduced clip.
* @param clipIBounds bounding box within which the reduced clip is valid. The caller must
* not draw any pixels outside this box. NOTE: this box may be undefined
* if no pixels are valid (e.g. empty result, "all out" initial state.)
* @param requiresAA indicates whether anti-aliasing is required to process any of the
* elements in the element list result. Undefined if the result is empty.
* @return the initial clip state within clipIBounds ("all in" or "all out").
*/
static InitialState ReduceClipStack(const SkClipStack& stack,
const SkRect& queryBounds,
ElementList* result,
int32_t* resultGenID,
SkIRect* clipIBounds,
bool* requiresAA);
};
#endif
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