1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/effects/SkArithmeticMode.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,37 @@
1.4 +/*
1.5 + * Copyright 2011 Google Inc.
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 SkArithmeticMode_DEFINED
1.12 +#define SkArithmeticMode_DEFINED
1.13 +
1.14 +#include "SkFlattenable.h"
1.15 +#include "SkScalar.h"
1.16 +
1.17 +class SkXfermode;
1.18 +
1.19 +class SK_API SkArithmeticMode {
1.20 +public:
1.21 + /**
1.22 + * result = clamp[k1 * src * dst + k2 * src + k3 * dst + k4]
1.23 + *
1.24 + * src and dst are treated as being [0.0 .. 1.0]. The polynomial is
1.25 + * evaluated on their unpremultiplied components.
1.26 + *
1.27 + * k1=k2=k3=0, k4=1.0 results in returning opaque white
1.28 + * k1=k3=k4=0, k2=1.0 results in returning the src
1.29 + * k1=k2=k4=0, k3=1.0 results in returning the dst
1.30 + */
1.31 + static SkXfermode* Create(SkScalar k1, SkScalar k2,
1.32 + SkScalar k3, SkScalar k4);
1.33 +
1.34 + SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP();
1.35 +
1.36 +private:
1.37 + SkArithmeticMode(); // can't be instantiated
1.38 +};
1.39 +
1.40 +#endif
