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