matrix.h

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#ifndef MATRIX_INCLUDED
#define MATRIX_INCLUDED
 
#ifdef __cplusplus
extern "C" {
#endif
 
//
// Top BYTE of each glyph is used as flags
// (redraw state, intensity etc)
//
// Bottom BYTE of each glyph is the character value
//
// Bit:  15     14     13-8     |  7-0
//
//    [Redraw][Blank][Intensity] [Glyph]
//
typedef unsigned short GLYPH;
 
#define GLYPH_REDRAW 0x8000
#define GLYPH_BLANK  0x4000
 
//
//  The "matrix" is basically an array of these
//  column structures, positioned side-by-side
//
typedef struct
{
    BOOL    state;
    int     countdown;
 
    BOOL    started;
    int     runlen;
 
    int     blippos;
    int     bliplen;
 
    int     length;
    GLYPH   *glyph;
 
} MATRIX_COLUMN;
 
typedef struct
{
    int             width;
    int             height;
    int             numcols;
    int             numrows;
 
    // bitmap containing glyphs.
    HDC             hdcBitmap;
    HBITMAP         hbmBitmap;
 
    MATRIX_MESSAGE *message;
 
    MATRIX_COLUMN   column[1];
 
} MATRIX;
 
GLYPH RandomGlyph(int intensity);
void  DrawGlyph(MATRIX *matrix, HDC hdc, int xpos, int ypos, GLYPH glyph);
 
HWND CreateScreenSaveWnd(HWND hwndParent, RECT *rect);
void InitScreenSaveClass();
 
#ifdef __cplusplus
}
#endif
 
#endif