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1 | |
2 /* | |
3 * Copyright 2011 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 | |
10 #include "SkPorterDuff.h" | |
11 #include "SkXfermode.h" | |
12 | |
13 #ifdef SK_SUPPORT_LEGACY_PORTER_DUFF | |
14 | |
15 /* This file just exists as a compatibility layer, gluing the PorterDuff API | |
16 into the (extended) SkXfermode API | |
17 */ | |
18 | |
19 #define MAKE_PAIR(mode) { SkPorterDuff::k##mode##_Mode, SkXfermode::k##mode##_Mo
de } | |
20 | |
21 // this table must be in SkPorterDuff::Mode order, so it can be indexed directly | |
22 // with a porterduff mode. | |
23 static const struct Pair { | |
24 SkPorterDuff::Mode fPD; | |
25 SkXfermode::Mode fXF; | |
26 } gPairs[] = { | |
27 MAKE_PAIR(Clear), | |
28 MAKE_PAIR(Src), | |
29 MAKE_PAIR(Dst), | |
30 MAKE_PAIR(SrcOver), | |
31 MAKE_PAIR(DstOver), | |
32 MAKE_PAIR(SrcIn), | |
33 MAKE_PAIR(DstIn), | |
34 MAKE_PAIR(SrcOut), | |
35 MAKE_PAIR(DstOut), | |
36 MAKE_PAIR(SrcATop), | |
37 MAKE_PAIR(DstATop), | |
38 MAKE_PAIR(Xor), | |
39 MAKE_PAIR(Darken), | |
40 MAKE_PAIR(Lighten), | |
41 MAKE_PAIR(Modulate), | |
42 MAKE_PAIR(Screen), | |
43 { SkPorterDuff::kAdd_Mode, SkXfermode::kPlus_Mode }, | |
44 #ifdef SK_BUILD_FOR_ANDROID | |
45 MAKE_PAIR(Overlay), | |
46 #endif | |
47 }; | |
48 | |
49 static bool find_pdmode(SkXfermode::Mode src, SkPorterDuff::Mode* dst) { | |
50 const Pair* pairs = gPairs; | |
51 for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) { | |
52 if (pairs[i].fXF == src) { | |
53 if (dst) { | |
54 *dst = pairs[i].fPD; | |
55 } | |
56 return true; | |
57 } | |
58 } | |
59 return false; | |
60 } | |
61 | |
62 SkXfermode::Mode SkPorterDuff::ToXfermodeMode(Mode mode) { | |
63 SkASSERT((unsigned)mode < SkPorterDuff::kModeCount); | |
64 const Pair& pair = gPairs[mode]; | |
65 SkASSERT(pair.fPD == mode); | |
66 return pair.fXF; | |
67 } | |
68 | |
69 SkXfermode* SkPorterDuff::CreateXfermode(SkPorterDuff::Mode mode) { | |
70 const Pair& pair = gPairs[mode]; | |
71 SkASSERT(pair.fPD == mode); | |
72 return SkXfermode::Create(pair.fXF); | |
73 } | |
74 | |
75 bool SkPorterDuff::IsMode(SkXfermode* xfer, Mode* pdmode) { | |
76 SkXfermode::Mode xfmode; | |
77 if (!SkXfermode::AsMode(xfer, &xfmode)) { | |
78 return false; | |
79 } | |
80 return find_pdmode(xfmode, pdmode); | |
81 } | |
82 | |
83 SkXfermodeProc SkPorterDuff::GetXfermodeProc(Mode mode) { | |
84 return SkXfermode::GetProc(gPairs[mode].fXF); | |
85 } | |
86 | |
87 SkXfermodeProc16 SkPorterDuff::GetXfermodeProc16(Mode mode, SkColor srcColor) { | |
88 return SkXfermode::GetProc16(gPairs[mode].fXF, srcColor); | |
89 } | |
90 | |
91 #endif | |
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