1 /* 2 * Copyright 2012 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef GrReducedClip_DEFINED 9 #define GrReducedClip_DEFINED 10 11 #include "SkClipStack.h" 12 #include "SkTLList.h" 13 14 class SK_API GrReducedClip { 15 public: 16 typedef SkTLList<SkClipStack::Element> ElementList; 17 18 enum InitialState { 19 kAllIn_InitialState, 20 kAllOut_InitialState, 21 }; 22 23 /** 24 * This function takes a clip stack and a query rectangle and it produces a 25 * reduced set of SkClipStack::Elements that are equivalent to applying the 26 * full stack to the rectangle. The clip stack generation id that represents 27 * the list of elements is returned in resultGenID. The initial state of the 28 * query rectangle before the first clip element is applied is returned via 29 * initialState. Optionally, the caller can request a tighter bounds on the 30 * clip be returned via tighterBounds. If not NULL, tighterBounds will 31 * always be contained by queryBounds after return. If tighterBounds is 32 * specified then it is assumed that the caller will implicitly clip against 33 * it. If the caller specifies non-NULL for requiresAA then it will indicate 34 * whether anti-aliasing is required to process any of the elements in the 35 * result. 36 * 37 * This may become a member function of SkClipStack when its interface is 38 * determined to be stable. 39 */ 40 static void ReduceClipStack(const SkClipStack& stack, 41 const SkIRect& queryBounds, 42 ElementList* result, 43 int32_t* resultGenID, 44 InitialState* initialState, 45 SkIRect* tighterBounds = NULL, 46 bool* requiresAA = NULL); 47 }; 48 49 #endif 50
