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