src/core/SkBitmapProcState.h

/*
** Copyright 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 SkBitmapProcState_DEFINED
#define SkBitmapProcState_DEFINED

#include "SkBitmap.h"
#include "SkMatrix.h"

class SkPaint;

struct SkBitmapProcState {

    typedef void (*ShaderProc32)(const SkBitmapProcState&, int x, int y,
                                 SkPMColor[], int count);

    typedef void (*ShaderProc16)(const SkBitmapProcState&, int x, int y,
                                 uint16_t[], int count);

    typedef void (*MatrixProc)(const SkBitmapProcState&,
                               uint32_t bitmapXY[],
                               int count,
                               int x, int y);
    
    typedef void (*SampleProc32)(const SkBitmapProcState&,
                                 const uint32_t[],
                                 int count,
                                 SkPMColor colors[]);

    typedef void (*SampleProc16)(const SkBitmapProcState&,
                                 const uint32_t[],
                                 int count,
                                 uint16_t colors[]);
    
    typedef U16CPU (*FixedTileProc)(SkFixed);   // returns 0..0xFFFF

    // If a shader proc is present, then the corresponding matrix/sample procs
    // are ignored
    ShaderProc32        fShaderProc32;      // chooseProcs
    ShaderProc16        fShaderProc16;      // chooseProcs
    // These are used if the shaderproc is NULL
    MatrixProc          fMatrixProc;        // chooseProcs
    SampleProc32        fSampleProc32;      // chooseProcs
    SampleProc16        fSampleProc16;      // chooseProcs

    SkMatrix            fUnitInvMatrix;     // chooseProcs
    FixedTileProc       fTileProcX;         // chooseProcs
    FixedTileProc       fTileProcY;         // chooseProcs
    SkFixed             fFilterOneX;
    SkFixed             fFilterOneY;

    const SkBitmap*     fBitmap;            // chooseProcs - orig or mip
    SkBitmap            fOrigBitmap;        // CONSTRUCTOR
#ifdef SK_SUPPORT_MIPMAP
    SkBitmap            fMipBitmap;
#endif
    SkPMColor           fPaintPMColor;      // chooseProcs - A8 config
    const SkMatrix*     fInvMatrix;         // chooseProcs
    SkMatrix::MapXYProc fInvProc;           // chooseProcs
    SkFixed             fInvSx, fInvSy;     // chooseProcs
    SkFixed             fInvKy;             // chooseProcs
    uint16_t            fAlphaScale;        // chooseProcs
    uint8_t             fInvType;           // chooseProcs
    uint8_t             fTileModeX;         // CONSTRUCTOR
    uint8_t             fTileModeY;         // CONSTRUCTOR
    SkBool8             fDoFilter;          // chooseProcs
    
    bool chooseProcs(const SkMatrix& inv, const SkPaint&);

private:
    MatrixProc chooseMatrixProc();
};

#endif