2 * Copyright 2013 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef SkLerpXfermode_DEFINED
9 #define SkLerpXfermode_DEFINED
11 #include "SkXfermode.h"
13 class SK_API SkLerpXfermode : public SkXfermode {
16 * result = scale * src + (1 - scale) * dst
18 * When scale == 1, this is the same as kSrc_Mode
19 * When scale == 0, this is the same as kDst_Mode
21 static SkXfermode* Create(SkScalar scale);
23 // overrides from SkXfermode
24 virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
25 const SkAlpha aa[]) const SK_OVERRIDE;
26 virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
27 const SkAlpha aa[]) const SK_OVERRIDE;
28 virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
29 const SkAlpha aa[]) const SK_OVERRIDE;
31 SK_DEVELOPER_TO_STRING()
32 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLerpXfermode)
35 SkLerpXfermode(SkFlattenableReadBuffer&);
36 virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
39 SkLerpXfermode(unsigned scale256);
41 unsigned fScale256; // 0..256
43 typedef SkXfermode INHERITED;