include/effects/SkColorMatrix.h

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef SkColorMatrix_DEFINED
#define SkColorMatrix_DEFINED

#include "SkScalar.h"

class SkColorMatrix {
public:
    SkScalar    fMat[20];
    
    void setIdentity();
    void setScale(SkScalar rScale, SkScalar gScale, SkScalar bScale,
                  SkScalar aScale = SK_Scalar1);
    void preScale(SkScalar rScale, SkScalar gScale, SkScalar bScale,
                  SkScalar aScale = SK_Scalar1);
    void postScale(SkScalar rScale, SkScalar gScale, SkScalar bScale,
                   SkScalar aScale = SK_Scalar1);

    enum Axis {
        kR_Axis = 0,
        kG_Axis = 1,
        kB_Axis = 2
    };
    void setRotate(Axis, SkScalar degrees);
    void setSinCos(Axis, SkScalar sine, SkScalar cosine);
    void preRotate(Axis, SkScalar degrees);
    void postRotate(Axis, SkScalar degrees);

    void setConcat(const SkColorMatrix& a, const SkColorMatrix& b);
    void preConcat(const SkColorMatrix& mat) { this->setConcat(*this, mat); }
    void postConcat(const SkColorMatrix& mat) { this->setConcat(mat, *this); }

    void setSaturation(SkScalar sat);
    void setRGB2YUV();
    void setYUV2RGB();
};

#endif