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- static char copyr[] = "Copyright 1990 by Dr. R. Brooks Van Horn, Jr.";
- /*
- This version of the Print Screen routine is for the HP Laser
- series printers and a VGA or EGA video adaptor with the higher
- resolution video modes, including super VGA.
- */
-
- #include <malloc.h>
- #include <bios.h>
- #include <dos.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <conio.h>
-
- #define dither 6
- #define esc 27
- #define LENMAX 770
-
- /* functions needed in program */
- void interrupt (far * int05) (void);
- void interrupt PrtScrn (void);
- int Print ( int, char * );
- void PinSet ( int, int, int, int );
- char Read_Pixel (int, int);
-
- /* data needed */
- static int dpi = 300;
- static long Columns;
- static int Max_Rows;
- static int Max_Cols;
- static char Video_Mode;
- int far * dkb = 0x0000041a; /* DOS Keyboard Area */
- char far * dds = 0x00000000; /* DOS Data Segment */
- char far * vds = 0x00000500; /* Video Data Segment */
- char far * Regen = 0xa0000000; /* Video Screen Address */
- char buffer[LENMAX], pline[256];
- int h_ratio, h_fract, v_ratio, v_fract;
- static int number;
-
- /*----------------------------------------------------------------------*/
-
- main ()
- {
- unsigned int pgm_size;
- char far * ptr = 0x00000467; /* use cassette data area */
-
- number = 0;
- *vds = 0;
- if (*ptr == 'b' && *(ptr+1) == 'v' && *(ptr+2) == 'h') {
- puts ("Laser.Exe TSR is already resident.");
- exit (1);
- }
-
- int05 = getvect (0x05);
- *(ptr ) = 'b';
- *(ptr+1) = 'v';
- *(ptr+2) = 'h';
- setvect (0x05, PrtScrn);
- pgm_size = farsetsize(0);
- puts ("Laser Graphics Print Screen TSR");
- puts ( copyr );
- puts ("has now been installed.");
- keep (0, pgm_size);
- }
-
- /*----------------------------------------------------------------------*/
-
- void interrupt PrtScrn (void)
- {
- int kb_head = *dkb, kb_tail= *(dkb+1);
- int row, col, cbit, error;
- int total, pin, i, j, k, rtot, extra, tcheck, begin, lenth;
- char pat, pat1, pat2, pat3, zero = 0x00;
- char crlf[] = { 0x0d, 0x0a }; /* do cr/lf cmd */
- char init_prn[] = {
- esc, 'E', /* Reset */
- esc, '&', 'l', '0', 'O', /* Portrait */
- esc, '*', 't', '3', '0', '0', 'R', /* dpi resolution */
- esc, '&', 'a', '6', '5', '0', 'H', /* move cursor from left */
- esc, '&', 'a', '2', '0', '0', 'V', /* and from the top */
- esc, '*', 'r', '1', 'A' /* strt grphs @ cursor pos */
- };
- /* Transmit xxx bytes of data following command */
- char graph[] = { esc, '*', 'b', 'x', 'x', 'x', 'W', 0, 0 };
- char width[] = " ";
- char eop[] = { esc, '*', 'r', 'B', /* end graphics */
- 12, /* form feed */
- esc, 'E' /* and reset printer */
- };
- union REGS regs;
-
-
-
- if (++number > 2)
- *vds = 0;
-
- if (*vds != 0) { /* if printing is active then exit */
- sound ( 950, 18 );
- return;
- }
-
- Video_Mode = *(dds + 0x0449);
- if (Video_Mode <= 3) {/* if we are not in a graphics mode */
- int05();
- return;
- }
-
- /* we are now in a position to do a print screen */
- *vds = 0xff; /* mark print screen status flag for others */
- enable(); /* enable further interrupts */
- Max_Rows = (int) *(dds + 0x0484) + 1;
- Max_Cols = ((int) *(dds + 0x044a)) + (((int) *(dds + 0x0000044b)) << 8);
- Max_Rows *= (int) *(dds + 0x0485); /* convert text chars to pixels */
- Columns = (long) Max_Cols;
- Max_Cols *= 8;
-
- /*
- The dimensions of the screen were obtained from the bios data area.
- The next step is to determine the size of the picture based on
- reserving a one inch margin on all sides and trying to use a 5 x 5
- dithering matrix. We use the term vertical to represent the
- direction along the 8.5" side of the printer paper and horizontal
- along the 11" side.
-
- ┌──────────────────────────────┐
- │ 1" │
- │ ┌──────────────────────┐ │
- │ │ Top │ │
- │ │ │ │
- │ │ │ │
- <------- │ 1"│ Picture │1" │ 8.5"(v)
- Paper │ │ │ │
- Feed │ │Left │ │
- │ └──────────────────────┘ │
- │ 1" │
- └──────────────────────────────┘
- 11" (h)
- */
-
- v_ratio = (( 13 * dpi ) >> 1); /* 6.5" * dots per inch */
- /* but adjust if it is too big for dithering matrix */
- v_ratio = v_ratio > (dither * Max_Rows) ? (dither * Max_Rows) : v_ratio;
- h_ratio = (4 * v_ratio + 1) / 3; /* 4:3 ratio adj for length*/
- /* get the fraction part of the ratio for vertical and horizontal */
- v_fract = v_ratio % Max_Rows;
- v_fract = (10 * v_fract + (Max_Rows>>1)) / Max_Rows; /* in [0,9] */
- h_fract = h_ratio % Max_Cols;
- h_fract = (10 * h_fract + (Max_Cols>>1)) / Max_Cols; /* in [0,9] */
- /* then get the integer part of the ratios */
- v_ratio = v_ratio / Max_Rows;
- h_ratio = h_ratio / Max_Cols;
- /* now check for overflows in rounding too high */
- if (v_fract >= 10) {
- v_ratio++;
- v_fract -= 10;
- }
- if (h_fract >= 10) {
- h_ratio++;
- h_fract -= 10;
- }
- /* now get the actual bytes to be sent to the printer per pass */
- tcheck = ((((10 * v_ratio + v_fract) * Max_Cols) / 10) + 7) >> 3;
-
- /* initialize the printer */
- regs.byte.ah = 1;
- regs.word.dx = 0;
- int86 ( 0x17, ®s, ®s ); /* initialize port LPT0 */
-
- if (Print ( 33, init_prn )) { /* reset the printer */
- *vds = 0;
- return;
- }
-
- /*
- We now process the video screen from the left to the right
- on the columns. The given pixel values will be dithered to
- provide a shading like effect for the black and white laser
- printer.
- */
-
- total = 0;
- for ( col = 0; col < Max_Cols; ++col) {
- if ((col % 100) == 0)
- sound ( 1500, 1 );
- /* check to see if a key has been pressed */
- if ((*dkb != kb_head) || (*(dkb+1) != kb_tail)) {
- *dkb = kb_head;
- *(dkb+1) = kb_tail;
- Print ( 7, eop );
- goto GET_OUT;
- }
- /* read a row of pixels for this column */
- for (i = 0, row = Max_Rows-1; row >= 0; --row, ++i )
- buffer[i] = Read_Pixel ( row, col );
-
- /* clear out the printer line for packing */
- memset ( pline, 0, 256 );
-
- /*
- now build the 'tcheck' bytes to send to the printer
- remembering that we will be multiline processing too.
- */
-
- pin = h_ratio;
- /* add fraction in to the sum */
- total += h_fract;
- if (total >= 10) { /* adjust for fractionals */
- total -= 10;
- ++pin;
- }
-
- /* This column will be processed 'pin' times in dither length */
- for (k = 0; k < pin; ++k) {
- extra = 0;
- rtot = 0;
- begin = 0;
- lenth = 1;
- for (i = 0; i < Max_Rows; ++i) {
- rtot += v_ratio;
- extra += v_fract;
- if (extra >= 10) {
- extra -= 10;
- ++rtot;
- }
- if (buffer[i])
- lenth = rtot;
- PinSet ( i, k, begin, rtot );
- begin = rtot;
- }
- /* declare number of items to send to printer */
- lenth = (lenth + 7) >> 3;
- itoa ( lenth, width, 10);
- if (lenth >= LENMAX) {
- puts (width);
- lenth = LENMAX;
- sound (1100,36);
- }
- strcpy ( &graph[3], width ); /* copy # bytes to txmt */
- strcat (graph, "W");
- for (j = 0; graph[j]; ++j) ; /* get length of string */
- if ( Print ( j, graph ) )
- goto GET_OUT;
- if ( Print ( lenth, pline ) )
- goto GET_OUT;
- } /* end for-loop on duplicate rows */
- } /* end for-loop on cols */
- Print ( 7, eop );
- GET_OUT:
- sound ( 1500, 9 );
- *vds = 0;
- number = 0;
- return;
- }
-
- /*----------------------------------------------------------------------*/
-
- char Read_Pixel ( int row, int col )
- {
- long offset = (long) row * Columns + (long)(col>>3);
- int plane, k;
- char color = 0x00, mask, temp;
- union REGS regs;
-
- if (row >= Max_Rows || col >= Max_Cols)
- return 0;
-
- if (Video_Mode < 8) { /* if CGA let BIOS do it */
- regs.word.ax = 0x0d00;
- regs.word.bx = 0;
- regs.word.dx = row;
- regs.word.cx = col;
- int86 ( 16, ®s, ®s );
- color = regs.byte.al;
- }
- else {
- mask = 0x80 >> (col % 8); /* bit mask for addressed byte */
- outp (0x3ce,4); /* select the Map Mask register */
- for (plane = 3; plane >= 0; --plane) {
- outp (0x3cf,plane); /* address the bit plane */
- temp = *(Regen + offset) & mask; /* get bit value */
- temp = temp ? 1 : 0 ; /* set bit if color match */
- color = (color << 1) | temp; /* save plane results */
- }
- outp (0x3c4,2); /* restore to Write Mode 0 */
- outp (0x3c5,15); /* with all planes enabled */
- }
- return color;
- }
-
- /*----------------------------------------------------------------------*/
-
- void PinSet ( ndx, sect, b1, b2 )
- int ndx; /* index to the color pattern to be smoothed */
- int sect; /* the row duplication index */
- int b1; /* the beginning bit to set */
- int b2; /* the last bit to set */
- {
- char pats[dither][dither];
- int bit, j, k, wd, i, kmod;
- char I, R, G, B, pat = buffer[ndx];
-
- if (pat == 0) /* if nothing to set then return */
- return;
-
- k = v_ratio >= dither ? dither : (v_ratio + 1);
- switch ( k ) {
- case 1:
- case 2:
- case 3:
- I = R = G = B = pat;
- kmod = 1;
- break;
- case 4:
- case 5:
- B = pat & 0x09; /* B or I */
- R = pat & 0x0a; /* R or I */
- G = pat & 0x0c; /* G or I */
- I = pat & 0x08; /* I */
- kmod = 3;
- break;
- default:
- B = pat & 0x01;
- R = pat & 0x02;
- G = pat & 0x04;
- I = pat & 0x08;
- kmod = 4;
- }
- bit = 0;
- for (i = 0; i < k; ++i) {
- for (j = 0; j < k; ++j, ++bit) {
- switch ( bit % kmod ) {
- case 0:
- pats[i][j] = R;
- break;
- case 1:
- pats[i][j] = G;
- break;
- case 2:
- pats[i][j] = B;
- break;
- case 3:
- pats[i][j] = I;
- }
- }
- }
- /* now create bytes for printing with these patterns */
- for (bit = b1; bit < b2; ++bit) {
- k = bit - b1; /* row index to pats array */
- if (pats[k][sect]) { /* if dithering has something here */
- wd = bit / 8; /* word index */
- i = 7 - ( bit % 8 ); /* bit index */
- pline[wd] |= (0x01 << i); /* and the bit mask */
- }
- }
-
- return;
- }
-
- /*--------------------------------------------------------------*/
-
- int Print ( int items, char * strng )
- {
- int i;
- int result;
- union REGS regs;
-
- for (i= 0; i < items; ++i) {
- regs.byte.ah = 0; /* function number */
- regs.byte.al = strng[i]; /* character to print */
- regs.word.dx = 0; /* printer Lpt0 */
- int86 ( 0x17, ®s, ®s );
- result = (int) regs.byte.ah; /* printer return code */
- if (result & 0x0029) {
- /* printer error */
- return ( result );
- }
- }
- return 0;
- }
-