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mc/slang/slsmg.c
Miguel de Icaza eb6b3842ab Initial revision
1998-02-27 04:54:42 +00:00

1186 lines
24 KiB
C
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/* SLang Screen management routines */
/* Copyright (c) 1992, 1995 John E. Davis
* All rights reserved.
*
* You may distribute under the terms of either the GNU General Public
* License or the Perl Artistic License.
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include "slang.h"
#include "_slang.h"
typedef struct Screen_Type
{
int n; /* number of chars written last time */
int flags; /* line untouched, etc... */
unsigned short *old, *neew;
#ifndef pc_system
unsigned long old_hash, new_hash;
#endif
}
Screen_Type;
#define TOUCHED 0x1
#define TRASHED 0x2
#ifndef pc_system
#define MAX_SCREEN_SIZE 120
#else
#define MAX_SCREEN_SIZE 75
#endif
Screen_Type SL_Screen[MAX_SCREEN_SIZE];
static int Start_Col, Start_Row;
static int Screen_Cols, Screen_Rows;
static int This_Row, This_Col;
static int This_Color; /* only the first 8 bits of this
* are used. The highest bit is used
* to indicate an alternate character
* set. This leaves 127 userdefineable
* color combination.
*/
#ifndef pc_system
#define ALT_CHAR_FLAG 0x80
#else
#define ALT_CHAR_FLAG 0x00
#endif
int SLsmg_Newline_Moves = 0;
int SLsmg_Backspace_Moves = 0;
static void blank_line (unsigned short *p, int n, unsigned char ch)
{
register unsigned short *pmax = p + n;
register unsigned short color_ch;
color_ch = (This_Color << 8) | (unsigned short) ch;
while (p < pmax)
{
*p++ = color_ch;
}
}
static void clear_region (int row, int n)
{
int i;
int imax = row + n;
if (imax > Screen_Rows) imax = Screen_Rows;
for (i = row; i < imax; i++)
{
if (i >= 0)
{
blank_line (SL_Screen[i].neew, Screen_Cols, ' ');
SL_Screen[i].flags |= TOUCHED;
}
}
}
void SLsmg_erase_eol (void)
{
int r, c;
c = This_Col - Start_Col;
r = This_Row - Start_Row;
if ((r < 0) || (r >= Screen_Rows)) return;
if (c < 0) c = 0; else if (c >= Screen_Cols) return;
blank_line (SL_Screen[This_Row].neew + c , Screen_Cols - c, ' ');
SL_Screen[This_Row].flags |= TOUCHED;
}
static void scroll_up (void)
{
unsigned int i, imax;
unsigned short *neew;
neew = SL_Screen[0].neew;
imax = Screen_Rows - 1;
for (i = 0; i < imax; i++)
{
SL_Screen[i].neew = SL_Screen[i + 1].neew;
SL_Screen[i].flags |= TOUCHED;
}
SL_Screen[i].neew = neew;
SL_Screen[i].flags |= TOUCHED;
blank_line (neew, Screen_Cols, ' ');
This_Row--;
}
void SLsmg_gotorc (int r, int c)
{
This_Row = r;
This_Col = c;
}
int SLsmg_get_row (void)
{
return This_Row;
}
int SLsmg_get_column (void)
{
return This_Col;
}
void SLsmg_erase_eos (void)
{
SLsmg_erase_eol ();
clear_region (This_Row + 1, Screen_Rows);
}
static int This_Alt_Char;
#ifndef pc_system
void SLsmg_set_char_set (int i)
{
if (SLtt_Use_Blink_For_ACS) return; /* alt chars not used and the alt bit
* is used to indicate a blink.
*/
if (i) This_Alt_Char = ALT_CHAR_FLAG;
else This_Alt_Char = 0;
This_Color &= 0x7F;
This_Color |= This_Alt_Char;
}
#endif
void SLsmg_set_color (int color)
{
if (color < 0) return;
This_Color = color | This_Alt_Char;
}
void SLsmg_reverse_video (void)
{
SLsmg_set_color (1);
}
void SLsmg_normal_video (void)
{
This_Color = This_Alt_Char; /* reset video but NOT char set. */
}
static int point_visible (int col_too)
{
return ((This_Row >= Start_Row) && (This_Row < Start_Row + Screen_Rows)
&& ((col_too == 0)
|| ((This_Col >= Start_Col)
&& (This_Col < Start_Col + Screen_Cols))));
}
void SLsmg_printf (char *fmt, ...)
{
char p[1000];
va_list ap;
va_start(ap, fmt);
(void) vsprintf(p, fmt, ap);
va_end(ap);
SLsmg_write_string (p);
}
void SLsmg_write_string (char *str)
{
SLsmg_write_nchars (str, strlen (str));
}
void SLsmg_write_nstring (char *str, int n)
{
int width;
char blank = ' ';
if (str == NULL) width = 0;
else
{
width = strlen (str);
if (width > n) width = n;
SLsmg_write_nchars (str, width);
}
while (width++ < n) SLsmg_write_nchars (&blank, 1);
}
void SLsmg_write_wrapped_string (char *s, int r, int c, int dr, int dc, int fill)
{
register char ch, *p;
int maxc = dc;
if ((dr == 0) || (dc == 0)) return;
p = s;
dc = 0;
while (1)
{
ch = *p++;
if ((ch == 0) || (ch == '\n'))
{
int diff;
diff = maxc - dc;
SLsmg_gotorc (r, c);
SLsmg_write_nchars (s, dc);
if (fill && (diff > 0))
{
while (diff--) SLsmg_write_char (' ');
}
if ((ch == 0) || (dr == 1)) break;
r++;
dc = 0;
dr--;
s = p;
}
else if (dc == maxc)
{
SLsmg_gotorc (r, c);
SLsmg_write_nchars (s, dc + 1);
if (dr == 1) break;
r++;
dc = 0;
dr--;
s = p;
}
else dc++;
}
}
int SLsmg_Tab_Width = 8;
/* Minimum value for which eight bit char is displayed as is. */
#ifndef pc_system
int SLsmg_Display_Eight_Bit = 160;
static unsigned char Alt_Char_Set[129];/* 129th is used as a flag */
#else
int SLsmg_Display_Eight_Bit = 128;
#endif
void SLsmg_write_nchars (char *str, int n)
{
register unsigned short *p, old, neew, color;
unsigned char ch;
unsigned int flags;
int len, start_len, max_len;
char *str_max;
int newline_flag;
#ifndef pc_system
int alt_char_set_flag;
alt_char_set_flag = ((SLtt_Use_Blink_For_ACS == 0)
&& (This_Color & ALT_CHAR_FLAG));
#endif
str_max = str + n;
color = This_Color << 8;
top: /* get here only on newline */
newline_flag = 0;
start_len = Start_Col;
if (point_visible (0) == 0) return;
len = This_Col;
max_len = start_len + Screen_Cols;
p = SL_Screen[This_Row].neew;
if (len > start_len) p += (len - start_len);
flags = SL_Screen[This_Row].flags;
while ((len < max_len) && (str < str_max))
{
ch = (unsigned char) *str++;
#ifndef pc_system
if (alt_char_set_flag)
ch = Alt_Char_Set [ch & 0x7F];
#endif
if (((ch >= ' ') && (ch < 127))
|| (ch >= (unsigned char) SLsmg_Display_Eight_Bit)
#ifndef pc_system
|| alt_char_set_flag
#endif
)
{
len += 1;
if (len > start_len)
{
old = *p;
neew = color | (unsigned short) ch;
if (old != neew)
{
flags |= TOUCHED;
*p = neew;
}
p++;
}
}
else if ((ch == '\t') && (SLsmg_Tab_Width > 0))
{
n = len;
n += SLsmg_Tab_Width;
n = SLsmg_Tab_Width - (n % SLsmg_Tab_Width);
if (len + n > max_len) n = max_len - len;
neew = color | (unsigned short) ' ';
while (n--)
{
len += 1;
if (len > start_len)
{
if (*p != neew)
{
flags |= TOUCHED;
*p = neew;
}
p++;
}
}
}
else if (ch == '\n')
{
newline_flag = 1;
break;
}
else if ((ch == 0x8) && SLsmg_Backspace_Moves)
{
if (len != 0) len--;
}
else
{
if (ch & 0x80)
{
neew = color | (unsigned short) '~';
len += 1;
if (len > start_len)
{
if (*p != neew)
{
*p = neew;
flags |= TOUCHED;
}
p++;
if (len == max_len) break;
ch &= 0x7F;
}
}
len += 1;
if (len > start_len)
{
neew = color | (unsigned short) '^';
if (*p != neew)
{
*p = neew;
flags |= TOUCHED;
}
p++;
if (len == max_len) break;
}
if (ch == 127) ch = '?'; else ch = ch + '@';
len++;
if (len > start_len)
{
neew = color | (unsigned short) ch;
if (*p != neew)
{
*p = neew;
flags |= TOUCHED;
}
p++;
}
}
}
SL_Screen[This_Row].flags = flags;
This_Col = len;
if (SLsmg_Newline_Moves == 0)
return;
if (newline_flag == 0)
{
while (str < str_max)
{
if (*str == '\n') break;
str++;
}
if (str == str_max) return;
str++;
}
This_Row++;
This_Col = 0;
if (This_Row == Start_Row + Screen_Rows)
{
if (SLsmg_Newline_Moves > 0) scroll_up ();
}
goto top;
}
void SLsmg_write_char (char ch)
{
SLsmg_write_nchars (&ch, 1);
}
static int Cls_Flag;
void SLsmg_cls (void)
{
This_Color = 0;
clear_region (0, Screen_Rows);
This_Color = This_Alt_Char;
Cls_Flag = 1;
}
#if 0
static void do_copy (unsigned short *a, unsigned short *b)
{
unsigned short *amax = a + Screen_Cols;
while (a < amax) *a++ = *b++;
}
#endif
#ifndef pc_system
int SLsmg_Scroll_Hash_Border = 0;
static unsigned long compute_hash (unsigned short *s, int n)
{
register unsigned long h = 0, g;
register unsigned long sum = 0;
register unsigned short *smax, ch;
int is_blank = 2;
s += SLsmg_Scroll_Hash_Border;
smax = s + (n - SLsmg_Scroll_Hash_Border);
while (s < smax)
{
ch = *s++;
if (is_blank && ((ch & 0xFF) != 32)) is_blank--;
sum += ch;
h = sum + (h << 3);
if ((g = h & 0xE0000000UL) != 0)
{
h = h ^ (g >> 24);
h = h ^ g;
}
}
if (is_blank) return 0;
return h;
}
static unsigned long Blank_Hash;
static void try_scroll (void)
{
int i, j, di, r1, r2, rmin, rmax;
unsigned long hash;
int color, did_scroll = 0;
unsigned short *tmp;
int ignore;
/* find region limits. */
for (rmax = Screen_Rows - 1; rmax > 0; rmax--)
{
if (SL_Screen[rmax].new_hash != SL_Screen[rmax].old_hash)
{
r1 = rmax - 1;
if ((r1 == 0)
|| (SL_Screen[r1].new_hash != SL_Screen[r1].old_hash))
break;
rmax = r1;
}
}
for (rmin = 0; rmin < rmax; rmin++)
{
if (SL_Screen[rmin].new_hash != SL_Screen[rmin].old_hash)
{
r1 = rmin + 1;
if ((r1 == rmax)
|| (SL_Screen[r1].new_hash != SL_Screen[r1].old_hash))
break;
rmin = r1;
}
}
for (i = rmax; i > rmin; i--)
{
hash = SL_Screen[i].new_hash;
if (hash == Blank_Hash) continue;
if ((hash == SL_Screen[i].old_hash)
|| ((i + 1 < Screen_Rows) && (hash == SL_Screen[i + 1].old_hash))
|| ((i - 1 > rmin) && (SL_Screen[i].old_hash == SL_Screen[i - 1].new_hash)))
continue;
for (j = i - 1; j >= rmin; j--)
{
if (hash == SL_Screen[j].old_hash) break;
}
if (j < rmin) continue;
r2 = i; /* end scroll region */
di = i - j;
j--;
ignore = 0;
while ((j >= rmin) && (SL_Screen[j].old_hash == SL_Screen[j + di].new_hash))
{
if (SL_Screen[j].old_hash == Blank_Hash) ignore++;
j--;
}
r1 = j + 1;
/* If this scroll only scrolls this line into place, don't do it.
*/
if ((di > 1) && (r1 + di + ignore == r2)) continue;
/* If there is anything in the scrolling region that is ok, abort the
* scroll.
*/
for (j = r1; j <= r2; j++)
{
if ((SL_Screen[j].old_hash != Blank_Hash)
&& (SL_Screen[j].old_hash == SL_Screen[j].new_hash))
{
/* See if the scroll is happens to scroll this one into place. */
if ((j + di > r2) || (SL_Screen[j].old_hash != SL_Screen[j + di].new_hash))
break;
}
}
if (j <= r2) continue;
color = This_Color; This_Color = 0;
did_scroll = 1;
SLtt_normal_video ();
SLtt_set_scroll_region (r1, r2);
SLtt_goto_rc (0, 0);
SLtt_reverse_index (di);
SLtt_reset_scroll_region ();
/* Now we have a hole in the screen. Make the virtual screen look
* like it.
*/
for (j = r1; j <= r2; j++) SL_Screen[j].flags = TOUCHED;
while (di--)
{
tmp = SL_Screen[r2].old;
for (j = r2; j > r1; j--)
{
SL_Screen[j].old = SL_Screen[j - 1].old;
SL_Screen[j].old_hash = SL_Screen[j - 1].old_hash;
}
SL_Screen[r1].old = tmp;
blank_line (SL_Screen[r1].old, Screen_Cols, ' ');
SL_Screen[r1].old_hash = Blank_Hash;
r1++;
}
This_Color = color;
}
if (did_scroll) return;
/* Try other direction */
for (i = rmin; i < rmax; i++)
{
hash = SL_Screen[i].new_hash;
if (hash == Blank_Hash) continue;
if (hash == SL_Screen[i].old_hash) continue;
/* find a match further down screen */
for (j = i + 1; j <= rmax; j++)
{
if (hash == SL_Screen[j].old_hash) break;
}
if (j > rmax) continue;
r1 = i; /* beg scroll region */
di = j - i; /* number of lines to scroll */
j++; /* since we know this is a match */
/* find end of scroll region */
ignore = 0;
while ((j <= rmax) && (SL_Screen[j].old_hash == SL_Screen[j - di].new_hash))
{
if (SL_Screen[j].old_hash == Blank_Hash) ignore++;
j++;
}
r2 = j - 1; /* end of scroll region */
/* If this scroll only scrolls this line into place, don't do it.
*/
if ((di > 1) && (r1 + di + ignore == r2)) continue;
/* If there is anything in the scrolling region that is ok, abort the
* scroll.
*/
for (j = r1; j <= r2; j++)
{
if ((SL_Screen[j].old_hash != Blank_Hash)
&& (SL_Screen[j].old_hash == SL_Screen[j].new_hash))
{
if ((j - di < r1) || (SL_Screen[j].old_hash != SL_Screen[j - di].new_hash))
break;
}
}
if (j <= r2) continue;
color = This_Color; This_Color = 0;
SLtt_normal_video ();
SLtt_set_scroll_region (r1, r2);
SLtt_goto_rc (0, 0); /* relative to scroll region */
SLtt_delete_nlines (di);
SLtt_reset_scroll_region ();
/* Now we have a hole in the screen. Make the virtual screen look
* like it.
*/
for (j = r1; j <= r2; j++) SL_Screen[j].flags = TOUCHED;
while (di--)
{
tmp = SL_Screen[r1].old;
for (j = r1; j < r2; j++)
{
SL_Screen[j].old = SL_Screen[j + 1].old;
SL_Screen[j].old_hash = SL_Screen[j + 1].old_hash;
}
SL_Screen[r2].old = tmp;
blank_line (SL_Screen[r2].old, Screen_Cols, ' ');
SL_Screen[r2].old_hash = Blank_Hash;
r2--;
}
This_Color = color;
}
}
#endif /* NOT pc_system */
static int Smg_Inited;
void SLsmg_refresh (void)
{
int i;
if (Smg_Inited == 0) return;
#ifndef pc_system
for (i = 0; i < Screen_Rows; i++)
{
if (SL_Screen[i].flags == 0) continue;
SL_Screen[i].new_hash = compute_hash (SL_Screen[i].neew, Screen_Cols);
}
#endif
if (Cls_Flag)
{
SLtt_normal_video (); SLtt_cls ();
}
#ifndef pc_system
else if (SLtt_Term_Cannot_Scroll == 0) try_scroll ();
#endif
for (i = 0; i < Screen_Rows; i++)
{
int trashed;
if (SL_Screen[i].flags == 0) continue;
if (SL_Screen[i].flags & TRASHED)
{
SLtt_goto_rc (i, -1); /* Force cursor to move */
SLtt_goto_rc (i, 0);
if (Cls_Flag == 0) SLtt_del_eol ();
trashed = 1;
}
else trashed = 0;
if (Cls_Flag || trashed)
{
int color = This_Color;
This_Color = 0;
blank_line (SL_Screen[i].old, Screen_Cols, ' ');
This_Color = color;
}
SL_Screen[i].old[Screen_Cols] = 0;
SL_Screen[i].neew[Screen_Cols] = 0;
SLtt_smart_puts (SL_Screen[i].neew, SL_Screen[i].old, Screen_Cols, i);
SLMEMCPY ((char *) SL_Screen[i].old, (char *) SL_Screen[i].neew,
Screen_Cols * sizeof (short));
SL_Screen[i].flags = 0;
#ifndef pc_system
SL_Screen[i].old_hash = SL_Screen[i].new_hash;
#endif
}
if (point_visible (1)) SLtt_goto_rc (This_Row - Start_Row, This_Col - Start_Col);
SLtt_flush_output ();
Cls_Flag = 0;
}
static int compute_clip (int row, int n, int box_start, int box_end,
int *rmin, int *rmax)
{
int row_max;
if (n < 0) return 0;
if (row >= box_end) return 0;
row_max = row + n;
if (row_max <= box_start) return 0;
if (row < box_start) row = box_start;
if (row_max >= box_end) row_max = box_end;
*rmin = row;
*rmax = row_max;
return 1;
}
void SLsmg_touch_lines (int row, int n)
{
int i;
int r1, r2;
if (0 == compute_clip (row, n, Start_Row, Start_Row + Screen_Rows, &r1, &r2))
return;
r1 -= Start_Row;
r2 -= Start_Row;
for (i = r1; i < r2; i++)
{
SL_Screen[i].flags |= TRASHED;
}
}
#ifndef pc_system
static char Fake_Alt_Char_Pairs [] = "a:j+k+l+m+q-t+u+v+w+x|";
static void init_alt_char_set (void)
{
int i;
unsigned char *p, *pmax, ch;
if (Alt_Char_Set[128] == 128) return;
i = 32;
memset ((char *)Alt_Char_Set, ' ', i);
while (i <= 128)
{
Alt_Char_Set [i] = i;
i++;
}
/* Map to VT100 */
if (SLtt_Has_Alt_Charset)
{
p = (unsigned char *) SLtt_Graphics_Char_Pairs;
if (p == NULL) return;
}
else p = (unsigned char *) Fake_Alt_Char_Pairs;
pmax = p + strlen ((char *) p);
/* Some systems have messed up entries for this */
while (p < pmax)
{
ch = *p++;
ch &= 0x7F; /* should be unnecessary */
Alt_Char_Set [ch] = *p;
p++;
}
}
#endif
#ifndef pc_system
# define BLOCK_SIGNALS SLsig_block_signals ();
# define UNBLOCK_SIGNALS SLsig_unblock_signals ();
#else
# define BLOCK_SIGNALS
# define UNBLOCK_SIGNALS
#endif
static int Smg_Suspended;
void SLsmg_suspend_smg (void)
{
BLOCK_SIGNALS
if (Smg_Suspended == 0)
{
SLtt_reset_video ();
Smg_Suspended = 1;
}
UNBLOCK_SIGNALS
}
void SLsmg_resume_smg (void)
{
int i;
BLOCK_SIGNALS
if (Smg_Suspended == 0)
{
UNBLOCK_SIGNALS
return;
}
Smg_Suspended = 0;
SLtt_init_video ();
Cls_Flag = 1;
for (i = 0; i < Screen_Rows; i++)
SL_Screen[i].flags |= TRASHED;
SLsmg_refresh ();
UNBLOCK_SIGNALS
}
int SLsmg_init_smg (void)
{
int i, len;
unsigned short *old, *neew;
BLOCK_SIGNALS
if (Smg_Inited) SLsmg_reset_smg ();
SLtt_init_video ();
Screen_Cols = SLtt_Screen_Cols;
Screen_Rows = SLtt_Screen_Rows;
This_Col = This_Row = Start_Col = Start_Row = 0;
This_Color = 0;
This_Alt_Char = 0;
Cls_Flag = 1;
#ifndef pc_system
init_alt_char_set ();
#endif
len = Screen_Cols + 3;
for (i = 0; i < Screen_Rows; i++)
{
if ((NULL == (old = (unsigned short *) SLMALLOC (sizeof(short) * len)))
|| ((NULL == (neew = (unsigned short *) SLMALLOC (sizeof(short) * len)))))
{
SLang_Error = SL_MALLOC_ERROR;
UNBLOCK_SIGNALS
return 0;
}
blank_line (old, len, ' ');
blank_line (neew, len, ' ');
SL_Screen[i].old = old;
SL_Screen[i].neew = neew;
SL_Screen[i].flags = 0;
#ifndef pc_system
Blank_Hash = compute_hash (old, Screen_Cols);
SL_Screen[i].new_hash = SL_Screen[i].old_hash = Blank_Hash;
#endif
}
Smg_Inited = 1;
UNBLOCK_SIGNALS
return 1;
}
void SLsmg_reset_smg (void)
{
int i;
BLOCK_SIGNALS
if (Smg_Inited == 0)
{
UNBLOCK_SIGNALS
return;
}
for (i = 0; i < Screen_Rows; i++)
{
if (SL_Screen[i].old != NULL) SLFREE (SL_Screen[i].old);
if (SL_Screen[i].neew != NULL) SLFREE (SL_Screen[i].neew);
SL_Screen[i].old = SL_Screen[i].neew = NULL;
}
SLtt_reset_video ();
This_Alt_Char = This_Color = 0;
Smg_Inited = 0;
UNBLOCK_SIGNALS
}
unsigned short SLsmg_char_at (void)
{
if (point_visible (1))
{
return SL_Screen[This_Row - Start_Row].neew[This_Col - Start_Col];
}
return 0;
}
void SLsmg_vprintf (char *fmt, va_list ap)
{
char p[1000];
(void) vsprintf(p, fmt, ap);
SLsmg_write_string (p);
}
void SLsmg_set_screen_start (int *r, int *c)
{
int or = Start_Row, oc = Start_Col;
if (c == NULL) Start_Col = 0;
else
{
Start_Col = *c;
*c = oc;
}
if (r == NULL) Start_Row = 0;
else
{
Start_Row = *r;
*r = or;
}
}
void SLsmg_draw_object (int r, int c, unsigned char object)
{
This_Row = r; This_Col = c;
if (point_visible (1))
{
int color = This_Color;
This_Color |= ALT_CHAR_FLAG;
SLsmg_write_char (object);
This_Color = color;
}
This_Col = c + 1;
}
void SLsmg_draw_hline (int n)
{
static unsigned char hbuf[16];
int count;
int cmin, cmax;
int final_col = This_Col + n;
int save_color;
if ((This_Row < Start_Row) || (This_Row >= Start_Row + Screen_Rows)
|| (0 == compute_clip (This_Col, n, Start_Col, Start_Col + Screen_Cols,
&cmin, &cmax)))
{
This_Col = final_col;
return;
}
if (hbuf[0] == 0)
{
SLMEMSET ((char *) hbuf, SLSMG_HLINE_CHAR, 16);
}
n = cmax - cmin;
count = n / 16;
save_color = This_Color;
This_Color |= ALT_CHAR_FLAG;
This_Col = cmin;
SLsmg_write_nchars ((char *) hbuf, n % 16);
while (count-- > 0)
{
SLsmg_write_nchars ((char *) hbuf, 16);
}
This_Color = save_color;
This_Col = final_col;
}
void SLsmg_draw_vline (int n)
{
unsigned char ch = SLSMG_VLINE_CHAR;
int c = This_Col, rmin, rmax;
int final_row = This_Row + n;
int save_color;
if (((c < Start_Col) || (c >= Start_Col + Screen_Cols)) ||
(0 == compute_clip (This_Row, n, Start_Row, Start_Row + Screen_Rows,
&rmin, &rmax)))
{
This_Row = final_row;
return;
}
save_color = This_Color;
This_Color |= ALT_CHAR_FLAG;
for (This_Row = rmin; This_Row < rmax; This_Row++)
{
This_Col = c;
SLsmg_write_nchars ((char *) &ch, 1);
}
This_Col = c; This_Row = final_row;
This_Color = save_color;
}
void SLsmg_draw_box (int r, int c, int dr, int dc)
{
if (!dr || !dc) return;
This_Row = r; This_Col = c;
dr--; dc--;
SLsmg_draw_hline (dc);
SLsmg_draw_vline (dr);
This_Row = r; This_Col = c;
SLsmg_draw_vline (dr);
SLsmg_draw_hline (dc);
SLsmg_draw_object (r, c, SLSMG_ULCORN_CHAR);
SLsmg_draw_object (r, c + dc, SLSMG_URCORN_CHAR);
SLsmg_draw_object (r + dr, c, SLSMG_LLCORN_CHAR);
SLsmg_draw_object (r + dr, c + dc, SLSMG_LRCORN_CHAR);
This_Row = r; This_Col = c;
}
void SLsmg_fill_region (int r, int c, int dr, int dc, unsigned char ch)
{
static unsigned char hbuf[16];
int count;
int dcmax, rmax;
if ((dc < 0) || (dr < 0)) return;
SLsmg_gotorc (r, c);
r = This_Row; c = This_Col;
dcmax = Screen_Cols - This_Col;
if (dc > dcmax) dc = dcmax;
rmax = This_Row + dr;
if (rmax > Screen_Rows) rmax = Screen_Rows;
#if 0
ch = Alt_Char_Set[ch];
#endif
if (ch != hbuf[0]) SLMEMSET ((char *) hbuf, (char) ch, 16);
for (This_Row = r; This_Row < rmax; This_Row++)
{
This_Col = c;
count = dc / 16;
SLsmg_write_nchars ((char *) hbuf, dc % 16);
while (count-- > 0)
{
SLsmg_write_nchars ((char *) hbuf, 16);
}
}
This_Row = r;
}
void SLsmg_forward (int n)
{
This_Col += n;
}
void SLsmg_write_color_chars (unsigned short *s, unsigned int len)
{
unsigned short *smax, sh;
char buf[32], *b, *bmax;
int color, save_color;
smax = s + len;
b = buf;
bmax = b + sizeof (buf);
save_color = This_Color;
while (s < smax)
{
sh = *s++;
color = sh >> 8;
if ((color != This_Color) || (b == bmax))
{
if (b != buf)
{
SLsmg_write_nchars (buf, (int) (b - buf));
b = buf;
}
This_Color = color;
}
*b++ = (char) (sh & 0xFF);
}
if (b != buf)
SLsmg_write_nchars (buf, (int) (b - buf));
This_Color = save_color;
}
unsigned int SLsmg_read_raw (unsigned short *buf, unsigned int len)
{
unsigned int r, c;
if (0 == point_visible (1)) return 0;
r = (unsigned int) (This_Row - Start_Row);
c = (unsigned int) (This_Col - Start_Col);
if (c + len > (unsigned int) Screen_Cols)
len = (unsigned int) Screen_Cols - c;
memcpy ((char *) buf, (char *) (SL_Screen[r].neew + c), len * sizeof (short));
return len;
}
unsigned int SLsmg_write_raw (unsigned short *buf, unsigned int len)
{
unsigned int r, c;
unsigned short *dest;
if (0 == point_visible (1)) return 0;
r = (unsigned int) (This_Row - Start_Row);
c = (unsigned int) (This_Col - Start_Col);
if (c + len > (unsigned int) Screen_Cols)
len = (unsigned int) Screen_Cols - c;
dest = SL_Screen[r].neew + c;
if (0 != memcmp ((char *) dest, (char *) buf, len * sizeof (short)))
{
memcpy ((char *) dest, (char *) buf, len * sizeof (short));
SL_Screen[r].flags |= TOUCHED;
}
return len;
}
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