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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 "SkXfermode.h" | |
| 12 | |
| 13 /** \class SkAvoidXfermode | |
| 14 | |
| 15 This xfermode will draw the src everywhere except on top of the specified | |
| 16 color. | |
| 17 */ | |
| 18 class SK_API SkAvoidXfermode : public SkXfermode { | |
| 19 public: | |
| 20 enum Mode { | |
| 21 kAvoidColor_Mode, //!< draw everywhere except on the opColor | |
| 22 kTargetColor_Mode //!< draw only on top of the opColor | |
| 23 }; | |
| 24 | |
| 25 /** This xfermode draws, or doesn't draw, based on the destination's | |
| 26 distance from an op-color. | |
| 27 | |
| 28 There are two modes, and each mode interprets a tolerance value. | |
| 29 | |
| 30 Avoid: In this mode, drawing is allowed only on destination pixels that | |
| 31 are different from the op-color. | |
| 32 Tolerance near 0: avoid any colors even remotely similar to the o
p-color | |
| 33 Tolerance near 255: avoid only colors nearly identical to the op-
color | |
| 34 | |
| 35 Target: In this mode, drawing only occurs on destination pixels that | |
| 36 are similar to the op-color | |
| 37 Tolerance near 0: draw only on colors that are nearly identical
to the op-color | |
| 38 Tolerance near 255: draw on any colors even remotely similar to
the op-color | |
| 39 */ | |
| 40 static SkAvoidXfermode* Create(SkColor opColor, U8CPU tolerance, Mode mode)
{ | |
| 41 return SkNEW_ARGS(SkAvoidXfermode, (opColor, tolerance, mode)); | |
| 42 } | |
| 43 | |
| 44 // overrides from SkXfermode | |
| 45 virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count, | |
| 46 const SkAlpha aa[]) const SK_OVERRIDE; | |
| 47 virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count, | |
| 48 const SkAlpha aa[]) const SK_OVERRIDE; | |
| 49 virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count, | |
| 50 const SkAlpha aa[]) const SK_OVERRIDE; | |
| 51 | |
| 52 SK_TO_STRING_OVERRIDE() | |
| 53 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkAvoidXfermode) | |
| 54 | |
| 55 protected: | |
| 56 SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode); | |
| 57 void flatten(SkWriteBuffer&) const SK_OVERRIDE; | |
| 58 | |
| 59 private: | |
| 60 SkColor fOpColor; | |
| 61 uint32_t fDistMul; // x.14 cached from fTolerance | |
| 62 uint8_t fTolerance; | |
| 63 Mode fMode; | |
| 64 | |
| 65 typedef SkXfermode INHERITED; | |
| 66 }; | |
| 67 | |
| 68 #endif | |
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Chromium Code Reviews
Issue 890893003:
Reland "remove unused SkAvoidXfermode" (Closed)
Base URL: https://skia.googlesource.com/skia.git@master