2a1d401bf2
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1649503002 Review URL: https://codereview.chromium.org/1649503002
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkAvoidXfermode_DEFINED
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#define SkAvoidXfermode_DEFINED
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#include "SkColor.h"
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#include "SkTypes.h"
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#include "SkXfermode.h"
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/** \class AvoidXfermode
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This xfermode will draw the src everywhere except on top of the specified
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color.
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*/
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class SkAvoidXfermode : public SkXfermode {
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public:
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enum Mode {
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kAvoidColor_Mode, //!< draw everywhere except on the opColor
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kTargetColor_Mode //!< draw only on top of the opColor
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};
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/** This xfermode draws, or doesn't draw, based on the destination's
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distance from an op-color.
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There are two modes, and each mode interprets a tolerance value.
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Avoid: In this mode, drawing is allowed only on destination pixels that
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are different from the op-color.
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Tolerance near 0: avoid any colors even remotely similar to the op-color
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Tolerance near 255: avoid only colors nearly identical to the op-color
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Target: In this mode, drawing only occurs on destination pixels that
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are similar to the op-color
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Tolerance near 0: draw only on colors that are nearly identical to the op-color
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Tolerance near 255: draw on any colors even remotely similar to the op-color
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*/
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static SkAvoidXfermode* Create(SkColor opColor, U8CPU tolerance, Mode mode) {
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return new SkAvoidXfermode(opColor, tolerance, mode);
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}
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// overrides from SkXfermode
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void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]) const override;
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void xfer16(uint16_t dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]) const override;
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void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]) const override;
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SK_TO_STRING_OVERRIDE()
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SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(AvoidXfermode)
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protected:
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SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode);
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void flatten(SkWriteBuffer&) const override;
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private:
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SkColor fOpColor;
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uint32_t fDistMul; // x.14 cached from fTolerance
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uint8_t fTolerance;
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Mode fMode;
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typedef SkXfermode INHERITED;
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};
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#endif
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