1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/effects/SkAvoidXfermode.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,72 @@
1.4 +/*
1.5 + * Copyright 2006 The Android Open Source Project
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef SkAvoidXfermode_DEFINED
1.12 +#define SkAvoidXfermode_DEFINED
1.13 +
1.14 +#include "SkXfermode.h"
1.15 +
1.16 +/** \class SkAvoidXfermode
1.17 +
1.18 + This xfermode will draw the src everywhere except on top of the specified
1.19 + color.
1.20 +*/
1.21 +class SK_API SkAvoidXfermode : public SkXfermode {
1.22 +public:
1.23 + enum Mode {
1.24 + kAvoidColor_Mode, //!< draw everywhere except on the opColor
1.25 + kTargetColor_Mode //!< draw only on top of the opColor
1.26 + };
1.27 +
1.28 + /** This xfermode draws, or doesn't draw, based on the destination's
1.29 + distance from an op-color.
1.30 +
1.31 + There are two modes, and each mode interprets a tolerance value.
1.32 +
1.33 + Avoid: In this mode, drawing is allowed only on destination pixels that
1.34 + are different from the op-color.
1.35 + Tolerance near 0: avoid any colors even remotely similar to the op-color
1.36 + Tolerance near 255: avoid only colors nearly identical to the op-color
1.37 +
1.38 + Target: In this mode, drawing only occurs on destination pixels that
1.39 + are similar to the op-color
1.40 + Tolerance near 0: draw only on colors that are nearly identical to the op-color
1.41 + Tolerance near 255: draw on any colors even remotely similar to the op-color
1.42 + */
1.43 + static SkAvoidXfermode* Create(SkColor opColor, U8CPU tolerance, Mode mode) {
1.44 + return SkNEW_ARGS(SkAvoidXfermode, (opColor, tolerance, mode));
1.45 + }
1.46 +
1.47 + // overrides from SkXfermode
1.48 + virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
1.49 + const SkAlpha aa[]) const SK_OVERRIDE;
1.50 + virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
1.51 + const SkAlpha aa[]) const SK_OVERRIDE;
1.52 + virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
1.53 + const SkAlpha aa[]) const SK_OVERRIDE;
1.54 +
1.55 + SK_TO_STRING_OVERRIDE()
1.56 + SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkAvoidXfermode)
1.57 +
1.58 +protected:
1.59 + SkAvoidXfermode(SkReadBuffer&);
1.60 + virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
1.61 +
1.62 +#ifdef SK_SUPPORT_LEGACY_PUBLICEFFECTCONSTRUCTORS
1.63 +public:
1.64 +#endif
1.65 + SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode);
1.66 +
1.67 +private:
1.68 + SkColor fOpColor;
1.69 + uint32_t fDistMul; // x.14
1.70 + Mode fMode;
1.71 +
1.72 + typedef SkXfermode INHERITED;
1.73 +};
1.74 +
1.75 +#endif
