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| 1 /* | |
| 2 * Copyright 2006 The Android Open Source Project | |
| 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 SkAvoidXfermode_DEFINED | |
| 9 #define SkAvoidXfermode_DEFINED | |
| 10 | |
| 11 #include "SkColor.h" | |
| 12 #include "SkTypes.h" | |
| 13 #include "SkXfermode.h" | |
| 14 | |
| 15 /** \class AvoidXfermode | |
| 16 | |
| 17 This xfermode will draw the src everywhere except on top of the specified | |
| 18 color. | |
| 19 */ | |
| 20 class SkAvoidXfermode : public SkXfermode { | |
| 21 public: | |
| 22 enum Mode { | |
| 23 kAvoidColor_Mode, //!< draw everywhere except on the opColor | |
| 24 kTargetColor_Mode //!< draw only on top of the opColor | |
| 25 }; | |
| 26 | |
| 27 /** This xfermode draws, or doesn't draw, based on the destination's | |
| 28 distance from an op-color. | |
| 29 | |
| 30 There are two modes, and each mode interprets a tolerance value. | |
| 31 | |
| 32 Avoid: In this mode, drawing is allowed only on destination pixels that | |
| 33 are different from the op-color. | |
| 34 Tolerance near 0: avoid any colors even remotely similar to the o
p-color | |
| 35 Tolerance near 255: avoid only colors nearly identical to the op-
color | |
| 36 | |
| 37 Target: In this mode, drawing only occurs on destination pixels that | |
| 38 are similar to the op-color | |
| 39 Tolerance near 0: draw only on colors that are nearly identical
to the op-color | |
| 40 Tolerance near 255: draw on any colors even remotely similar to
the op-color | |
| 41 */ | |
| 42 static SkAvoidXfermode* Create(SkColor opColor, U8CPU tolerance, Mode mode)
{ | |
| 43 return new SkAvoidXfermode(opColor, tolerance, mode); | |
| 44 } | |
| 45 | |
| 46 // overrides from SkXfermode | |
| 47 void xfer32(SkPMColor dst[], const SkPMColor src[], int count, | |
| 48 const SkAlpha aa[]) const override; | |
| 49 void xfer16(uint16_t dst[], const SkPMColor src[], int count, | |
| 50 const SkAlpha aa[]) const override; | |
| 51 void xferA8(SkAlpha dst[], const SkPMColor src[], int count, | |
| 52 const SkAlpha aa[]) const override; | |
| 53 | |
| 54 SK_TO_STRING_OVERRIDE() | |
| 55 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(AvoidXfermode) | |
| 56 | |
| 57 protected: | |
| 58 SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode); | |
| 59 void flatten(SkWriteBuffer&) const override; | |
| 60 | |
| 61 private: | |
| 62 SkColor fOpColor; | |
| 63 uint32_t fDistMul; // x.14 cached from fTolerance | |
| 64 uint8_t fTolerance; | |
| 65 Mode fMode; | |
| 66 | |
| 67 typedef SkXfermode INHERITED; | |
| 68 }; | |
| 69 | |
| 70 #endif | |
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Chromium Code Reviews
Issue 1645093002:
Move SkPixelXorXfermode.h to include/client/android (Closed)
Base URL: https://skia.googlesource.com/skia.git@master