The Tor Browser: gfx/skia/trunk/include/effects/SkArithmeticMode.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * Copyright 2011 Google Inc.

     3  *

     4  * Use of this source code is governed by a BSD-style license that can be

     5  * found in the LICENSE file.

     6  */

     8 #ifndef SkArithmeticMode_DEFINED

     9 #define SkArithmeticMode_DEFINED

    11 #include "SkFlattenable.h"

    12 #include "SkScalar.h"

    14 class SkXfermode;

    16 class SK_API SkArithmeticMode {

    17 public:

    18     /**

    19      *  result = clamp[k1 * src * dst + k2 * src + k3 * dst + k4]

    20      *

    21      *  src and dst are treated as being [0.0 .. 1.0]. The polynomial is

    22      *  evaluated on their unpremultiplied components.

    23      *

    24      *  k1=k2=k3=0, k4=1.0 results in returning opaque white

    25      *  k1=k3=k4=0, k2=1.0 results in returning the src

    26      *  k1=k2=k4=0, k3=1.0 results in returning the dst

    27      */

    28     static SkXfermode* Create(SkScalar k1, SkScalar k2,

    29                               SkScalar k3, SkScalar k4);

    31     SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP();

    33 private:

    34     SkArithmeticMode(); // can't be instantiated

    35 };

    37 #endif

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