www.pudn.com > commutil.zip > SCREEN.CPP

// ******************************************************************** // 
//                                                                      // 
//      SCREEN.CPP                                                      // 
//      Copyright (c) 1993, Michael Holmes and Bob Flanders             // 
//      C++ Communication Utilities                                     // 
//                                                                      // 
//      This file contains the routines for moving to and from          // 
//      the window buffers for saving and restoring the screen.         // 
//                                                                      // 
// ******************************************************************** // 
 
 
char    huge *vid_seg =                     // video adapter address 
            (char huge *) MK_FP(0xb800, 0); 
 
 
 
/* ******************************************************************** * 
 * 
 *  screen_move() -- move between the video adapter and work buffer 
 * 
 * ******************************************************************** */ 
 
void    screen_move(int  left,  int top,    // left and top corner 
                    int  right, int bottom, // right and bottom corner 
                    char *buffer,           // work buffer 
                    int  dir)               // direction (0=to screen) 
{ 
char    huge *p1, huge *p2;                 // work pointers 
int     y,                                  // loop variable 
        p1size, p2size, size;               // bytes per line 
 
 
size = (right - left + 1) * 2;              // length of window line 
y = ((top - 1) * 160) + ((left - 1) * 2);   // offset into video buffer 
 
if (dir)                                    // q. moving to buffer? 
    { 
    p1 = buffer;                            // a. yes .. dest is buffer 
    p1size = size;                          // ..and line length 
    p2 = &vid_seg[y];                       // source is video ram 
    p2size = 160;                           // ..and length is 80 * 2 
    } 
 else 
    { 
    p1 = &vid_seg[y];                       // else .. source is video ram 
    p1size = 160;                           // ..and length is 80 * 2 
    p2 = buffer;                            // destination is buffer 
    p2size = size;                          // ..and line length 
    } 
 
for (y = bottom - top + 1; y--;             // loop thru for whole 
           p1 += p1size, p2 += p2size)      // ..screen window moving 
    memcpy((void *) p1, (void *) p2, size); // ..from one to the other 
 
} 
 
 
 
/* ******************************************************************** * 
 * 
 *  gettext() -- get text data from the video memory 
 * 
 * ******************************************************************** */ 
 
void    gettext(int  left, int top,         // left and top corner 
                int  right, int bottom,     // right and bottom corner 
                char *buffer)               // work buffer 
{ 
 
screen_move(left, top, right, bottom,       // set up common call 
        buffer, 1);                         // ..to screen move routine 
 
} 
 
 
 
/* ******************************************************************** * 
 * 
 *  puttext() -- put text data from a work buffer into the video memory 
 * 
 * ******************************************************************** */ 
 
void    puttext(int  left, int top,         // left and top corner 
                int  right, int bottom,     // right and bottom corner 
                char *buffer)               // work buffer 
{ 
 
screen_move(left, top, right, bottom,       // set up common call 
        buffer, 0);                         // ..to screen move routine 
 
}