IMG_FileFilterConvert.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        IMG_FileFilterConvert ( IMG Library, C++)
 *
 * COMMENTS:
 *
 *    Does data format conversion (int8, fp16, etc) and color model
 *    conversion (RGB, A, RGBA).
 */
#ifndef IMG_FILE_FILTER_CONVERT_H
#define IMG_FILE_FILTER_CONVERT_H

#include "IMG_API.h"
#include "IMG_FileFilter.h"
#include <PXL/PXL_LumFuncs.h>
#include <UT/UT_NonCopyable.h>

class img_PlaneConvert;

class IMG_API IMG_FileFilterConvert : public IMG_FileFilter
{
public:
             IMG_FileFilterConvert(IMG_File *file_to_filter);
            ~IMG_FileFilterConvert() override;

            UT_NON_COPYABLE(IMG_FileFilterConvert)

    const char *className() const override { return "IMG_FileFilterConvert"; }

    void        initConversion(IMG_DataType type,
                               IMG_ColorModel model,
                               IMG_ComponentOrder order,
                               bool interleaved,
                               PXL_LumFunction func,
                               bool splitoutalpha,
                               const char *plane_name);
    
    const void  *readPlaneScanline(int y, const IMG_Plane &pi) override;
    
    int          writePlaneScanline(const void *data, int y,
                                    const IMG_Plane &pi) override;
private:
    void        convertPlane(int pindex,
                             const IMG_Stat &sstat,
                             bool sinterleave,
                             IMG_Stat &dstat,
                             bool dinterleave);
    
    void        convertData(void *dest, const void *source, int pindex, int y);

    void        splitAlphaFromColor(void *dest, const void *alpha, int pindex,
                                    bool reversed);
    void        writeAlphaToColor(void *dest, const void *alpha, int pindex);
    
    bool        findAlphaPlane(const IMG_Stat &stat,int &aindex, int &acomp);

    void        initRead(IMG_DataType type,
                         IMG_ColorModel model,
                         IMG_ComponentOrder order,
                         bool interleaved,
                         PXL_LumFunction func,
                         bool splitoutalpha,
                         const char *plane_name);
    
    void        initWrite(IMG_DataType type,
                          IMG_ColorModel model,
                          IMG_ComponentOrder order,
                          bool interleaved,
                          PXL_LumFunction func,
                          bool splitoutalpha,
                          const char *plane_name);
    
    UT_ValArray<img_PlaneConvert *> myPlaneConvert;
    PXL_LumFunction myLumFunc;
    UT_IntArray myAlphaCombineFlags;
};

#endif