1 2 /* 3 * Copyright 2012 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 #include "SkClipStack.h" 10 #include "SkTLList.h" 11 12 namespace GrReducedClip { 13 14 typedef SkTLList<SkClipStack::Element> ElementList; 15 16 enum InitialState { 17 kAllIn_InitialState, 18 kAllOut_InitialState, 19 }; 20 21 /** 22 * This function takes a clip stack and a query rectangle and it produces a reduced set of 23 * SkClipStack::Elements that are equivalent to applying the full stack to the rectangle. The 24 * initial state of the query rectangle before the first clip element is applied is returned via 25 * initialState. Optionally, the caller can request a tighter bounds on the clip be returned via 26 * tighterBounds. If not NULL, tighterBounds will always be contained by queryBounds after return. 27 * If tighterBounds is specified then it is assumed that the caller will implicitly clip against it. 28 * If the caller specifies non-NULL for requiresAA then it will indicate whether anti-aliasing is 29 * required to process any of the elements in the result. 30 * 31 * This may become a member function of SkClipStack when its interface is determined to be stable. 32 */ 33 void ReduceClipStack(const SkClipStack& stack, 34 const SkIRect& queryBounds, 35 ElementList* result, 36 InitialState* initialState, 37 SkIRect* tighterBounds = NULL, 38 bool* requiresAA = NULL); 39 40 } // namespace GrReducedClip 41
