scale.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 NUVIE_SCREEN_SCALE_H
#define NUVIE_SCREEN_SCALE_H

#include "ultima/shared/std/string.h"

namespace Ultima {
namespace Nuvie {

#define SCALER_FLAG_2X_ONLY         1
#define SCALER_FLAG_16BIT_ONLY      2
#define SCALER_FLAG_32BIT_ONLY      4

struct ScalerStruct {
    typedef void (*ScalerType16)(uint16 *, int , int , int , int , const int , const int , uint16 *, const int, int);
    typedef void (*ScalerType32)(uint32 *, int , int , int , int , const int , const int , uint32 *, const int, int);

    const char      *name;
    uint32          flags;              // Scaler flags

    ScalerType16    scale16;
    ScalerType16    scale555;
    ScalerType16    scale565;

    ScalerType32    scale32;
    ScalerType32    scale888;

    // Call this to scale a section of the screen
    inline void     Scale(
        int type,                   // Format type of buffers 16, 555, 565, 32 or 888
        void *source,               // ->source pixels.
        int srcx, int srcy,         // Start of rectangle within src.
        int srcw, int srch,         // Dims. of rectangle.
        const int sline_pixels,     // Pixels /line for source.
        const int sheight,          // Source height.
        void *dest,                 // ->dest pixels.
        const int dline_pixels,     // Pixels /line for dest.
        int scale_factor            // Scale factor
    ) const {
        if (type == 16) {
            scale16((uint16 *) source, srcx, srcy, srcw, srch, sline_pixels, sheight, (uint16 *) dest, dline_pixels, scale_factor);
        } else if (type == 555) {
            scale16((uint16 *) source, srcx, srcy, srcw, srch, sline_pixels, sheight, (uint16 *) dest, dline_pixels, scale_factor);
        } else if (type == 565) {
            scale16((uint16 *) source, srcx, srcy, srcw, srch, sline_pixels, sheight, (uint16 *) dest, dline_pixels, scale_factor);
        } else if (type == 32) {
            scale32((uint32 *) source, srcx, srcy, srcw, srch, sline_pixels, sheight, (uint32 *) dest, dline_pixels, scale_factor);
        } else if (type == 888) {
            scale888((uint32 *) source, srcx, srcy, srcw, srch, sline_pixels, sheight, (uint32 *) dest, dline_pixels, scale_factor);
        }
    }

};

//
// This entire class is just static
//
class ScalerRegistry {
    static const            ScalerStruct scaler_array[];
    int                     num_scalers;

public:

    // Constructor
    ScalerRegistry();

    // Destructor
    ~ScalerRegistry();

    // Get the total Number of scalers
    int             GetNumScalers() {
        return num_scalers;
    }

    // Get the Scaler Index from it's name
    int             GetIndexForName(const Std::string &name);

    // Get Name of a Scaler from its Index
    const char      *GetNameForIndex(int index);

    // Get a Scaler from it's Index
    const ScalerStruct  *GetScaler(int index);

    // Get the Point Sampling Scaler
    const ScalerStruct  *GetPointScaler();
};

} // End of namespace Nuvie
} // End of namespace Ultima

#endif