edge.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef GRAPHICS_SCALER_EDGE_H
#define GRAPHICS_SCALER_EDGE_H

#include "graphics/scalerplugin.h"

class EdgeScaler : public SourceScaler {
public:

    EdgeScaler(const Graphics::PixelFormat &format);
    uint increaseFactor() override;
    uint decreaseFactor() override;

protected:

    virtual void internScale(const uint8 *srcPtr, uint32 srcPitch,
                           uint8 *dstPtr, uint32 dstPitch,
                           const uint8 *oldSrcPtr, uint32 oldSrcPitch,
                           int width, int height, const uint8 *buffer, uint32 bufferPitch) override;

private:

    template<typename ColorMask>
    int16 *chooseGreyscale(typename ColorMask::PixelType *pixels);

    template<typename ColorMask>
    int32 calcPixelDiffNosqrt(typename ColorMask::PixelType pixel1, typename ColorMask::PixelType pixel2);

    int findPrincipleAxis(int16 *diffs, int16 *bplane,
        int8 *sim,
        int32 *return_angle);

    template<typename Pixel>
    int checkArrows(int best_dir, Pixel *pixels, int8 *sim, int half_flag);

    template<typename Pixel>
    int refineDirection(char edge_type, Pixel *pixels, int16 *bptr,
        int8 *sim, double angle);

    template<typename Pixel>
    int fixKnights(int sub_type, Pixel *pixels, int8 *sim);

    void initTables(const uint8 *srcPtr, uint32 srcPitch,
        int width, int height);

    template<typename ColorMask>
    void antiAliasGrid2x(uint8 *dptr, int dstPitch,
        typename ColorMask::PixelType *pixels, int sub_type, int16 *bptr,
        int8 *sim,
        int interpolate_2x);

    template<typename ColorMask>
    void antiAliasGridClean3x(uint8 *dptr, int dstPitch,
        typename ColorMask::PixelType *pixels, int sub_type, int16 *bptr);

    template<typename ColorMask>
    void antiAliasPass2x(const uint8 *src, uint8 *dst,
        int w, int h,
        int srcPitch, int dstPitch,
        int interpolate_2x,
        bool haveOldSrc,
        const uint8 *oldSrc, int oldSrcPitch,
        const uint8 *buffer, int bufferPitch);

    template<typename ColorMask>
    void antiAliasPass3x(const uint8 *src, uint8 *dst,
        int w, int h,
        int srcPitch, int dstPitch,
        bool haveOldSrc,
        const uint8* oldSrc, int oldPitch,
        const uint8 *buffer, int bufferPitch);

    int16 _rgbTable[65536][3];       
    int16 _greyscaleTable[3][65536]; 
    int16 *_chosenGreyscale;               
    int16 *_bptr;                          
    int8 _simSum;                          
    int16 _greyscaleDiffs[3][8];
    int16 _bplanes[3][9];
};


#endif