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blit_transparent_rle.h

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/*
        ------------------------------------------------------------------------
        ClanLib, the platform independent game SDK.

        This library is distributed under the GNU LIBRARY GENERAL PUBLIC LICENSE
        version 2. See COPYING for details.

        For a total list of contributers see CREDITS.

        ------------------------------------------------------------------------
*/

#ifndef header_blit_transparent_rle
#define header_blit_transparent_rle

#include "blitters.h"

class CL_SurfaceProvider;

class CL_Blit_Transparent_RLE :
        public CL_Blit_NoClip
{
protected:
        int width, height, no_sprs;
        int bytes_per_pixel;
        unsigned char **rle_lines;
        
        enum
        {
                cmd_skip,     // next word = bytes to skip
                cmd_copy,     // next word = bytes to copy
                cmd_alpha,    // next word = _blocks_ to apply alpha
                cmd_end
        };
        
        int calc_rle_size(unsigned char *alpha_line);

        virtual unsigned char *make_rle_line(
                unsigned char *src_line, 
                unsigned char *alpha_line) = 0;

        virtual void blt_line(
                unsigned char *s, 
                unsigned char *d) = 0;

public:

        CL_Blit_Transparent_RLE(
                CL_SurfaceProvider *provider,
                int bytes_per_pixel);

        virtual ~CL_Blit_Transparent_RLE();

        virtual void blt_noclip(
                CL_Target *dest_surf,
                int x,
                int y,
                int spr_no);
};

#endif

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