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 clip 24 * stack generation id that represents the list of elements is returned in resultGenID. The 25 * initial state of the query rectangle before the first clip element is applied is returned via 26 * initialState. Optionally, the caller can request a tighter bounds on the clip be returned via 27 * tighterBounds. If not NULL, tighterBounds will always be contained by queryBounds after return. 28 * If tighterBounds is specified then it is assumed that the caller will implicitly clip against it. 29 * If the caller specifies non-NULL for requiresAA then it will indicate whether anti-aliasing is 30 * required to process any of the elements in the result. 31 * 32 * This may become a member function of SkClipStack when its interface is determined to be stable. 33 * Marked SK_API so that SkLua can call this in a shared library build. 34 */ 35 SK_API void ReduceClipStack(const SkClipStack& stack, 36 const SkIRect& queryBounds, 37 ElementList* result, 38 int32_t* resultGenID, 39 InitialState* initialState, 40 SkIRect* tighterBounds = NULL, 41 bool* requiresAA = NULL); 42 43 } // namespace GrReducedClip 44
