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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 {
typedef SkTLList<SkClipStack::Element> ElementList;
enum 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. 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.
static void ReduceClipStack(const SkClipStack& stack,
const SkIRect& queryBounds,
ElementList* result,
int32_t* resultGenID,
InitialState* initialState,
SkIRect* tighterBounds = NULL,
bool* requiresAA = NULL);