1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SkAvoidXfermode_DEFINED
#define SkAvoidXfermode_DEFINED
#include "SkXfermode.h"
/** \class SkAvoidXfermode
This xfermode will draw the src everywhere except on top of the specified
color.
*/
class SkAvoidXfermode : public SkXfermode {
public:
enum Mode {
kAvoidColor_Mode, //!< draw everywhere except on the opColor
kTargetColor_Mode //!< draw only on top of the opColor
};
/** This xfermode draws, or doesn't draw, based on the destination's
distance from an op-color.
There are two modes, and each mode interprets a tolerance value.
Avoid: In this mode, drawing is allowed only on destination pixels that
are different from the op-color.
Tolerance near 0: avoid any colors even remotely similar to the op-color
Tolerance near 255: avoid only colors nearly identical to the op-color
Target: In this mode, drawing only occurs on destination pixels that
are similar to the op-color
Tolerance near 0: draw only on colors that are nearly identical to the op-color
Tolerance near 255: draw on any colors even remotely similar to the op-color
*/
SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode);
// overrides from SkXfermode
virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
const SkAlpha aa[]);
virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
const SkAlpha aa[]);
virtual void xfer4444(uint16_t dst[], const SkPMColor src[], int count,
const SkAlpha aa[]);
virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
const SkAlpha aa[]);
// overrides from SkFlattenable
virtual Factory getFactory();
virtual void flatten(SkFlattenableWriteBuffer&);
static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
return SkNEW_ARGS(SkAvoidXfermode, (buffer));
}
protected:
SkAvoidXfermode(SkFlattenableReadBuffer&);
private:
SkColor fOpColor;
uint32_t fDistMul; // x.14
Mode fMode;
static SkFlattenable* Create(SkFlattenableReadBuffer&);
typedef SkXfermode INHERITED;
};
#endif
|
