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Scrolling region.

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This commit is contained in:
Nicholas Marriott
2007-08-28 09:19:50 +00:00
parent 38b752c1d8
commit fc63750d30
5 changed files with 95 additions and 52 deletions
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120
screen.c
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@ -1,4 +1,4 @@
/* $Id: screen.c,v 1.7 2007-08-27 11:21:05 nicm Exp $ */
/* $Id: screen.c,v 1.8 2007-08-28 09:19:50 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -37,8 +37,10 @@ void screen_fill_lines(
struct screen *, u_int, u_int, u_char, u_char, u_char);
uint16_t screen_extract(u_char *);
void screen_write_character(struct screen *, u_char);
void screen_cursor_up_scroll(struct screen *, u_int);
void screen_cursor_down_scroll(struct screen *, u_int);
void screen_cursor_up_scroll(struct screen *);
void screen_cursor_down_scroll(struct screen *);
void screen_scroll_region_up(struct screen *);
void screen_scroll_region_down(struct screen *);
void screen_scroll_up(struct screen *, u_int);
void screen_scroll_down(struct screen *, u_int);
void screen_fill_screen(struct screen *, u_char, u_char, u_char);
@ -381,7 +383,7 @@ screen_character(struct screen *s, u_char ch)
{
switch (ch) {
case '\n': /* LF */
screen_cursor_down_scroll(s, 1);
screen_cursor_down_scroll(s);
break;
case '\r': /* CR */
s->cx = 0;
@ -492,13 +494,8 @@ screen_sequence(struct screen *s, u_char *ptr)
case CODE_CURSOROFF:
s->mode &= ~MODE_CURSOR;
break;
case CODE_CURSORDOWNSCROLL:
ua = screen_extract(ptr);
screen_cursor_down_scroll(s, ua);
break;
case CODE_CURSORUPSCROLL:
ua = screen_extract(ptr);
screen_cursor_up_scroll(s, ua);
case CODE_REVERSEINDEX:
screen_cursor_up_scroll(s);
break;
case CODE_SCROLLREGION:
ua = screen_extract(ptr);
@ -623,7 +620,7 @@ screen_write_character(struct screen *s, u_char ch)
{
if (s->cx > screen_last_x(s)) {
s->cx = 0;
screen_cursor_down_scroll(s, 1);
screen_cursor_down_scroll(s);
}
s->grid_data[s->cy][s->cx] = ch;
@ -635,48 +632,98 @@ screen_write_character(struct screen *s, u_char ch)
/* Move cursor up and scroll if necessary. */
void
screen_cursor_up_scroll(struct screen *s, u_int ny)
screen_cursor_up_scroll(struct screen *s)
{
if (s->cy < ny) {
screen_scroll_down(s, ny - s->cy);
s->cy = 0;
} else
s->cy -= ny;
if (s->cy == s->ry_upper)
screen_scroll_region_down(s);
else if (s->cy > 0)
s->cy--;
}
/* Move cursor down and scroll if necessary. */
void
screen_cursor_down_scroll(struct screen *s, u_int ny)
screen_cursor_down_scroll(struct screen *s)
{
if (s->cy + ny > screen_last_y(s)) {
screen_scroll_up(s, ny - (screen_last_y(s) - s->cy));
s->cy = screen_last_y(s);
} else
s->cy += ny;
if (s->cy == s->ry_lower)
screen_scroll_region_up(s);
else if (s->cy < screen_last_y(s))
s->cy++;
}
/* Scroll region up. */
void
screen_scroll_region_up(struct screen *s)
{
log_debug("scrolling region up: %u:%u", s->ry_upper, s->ry_lower);
/*
* Scroll scrolling region up:
* - delete ry_upper
* - move ry_upper + 1 to ry_lower to ry_upper
* - make new line at ry_lower
*
* Example: region is 12 to 24.
* ry_lower = 24, ry_upper = 12
* screen_free_lines(s, 12, 1);
* screen_move_lines(s, 12, 13, 12);
* screen_make_lines(s, 24, 1);
*/
screen_free_lines(s, s->ry_upper, 1);
if (s->ry_upper != s->ry_lower) {
screen_move_lines(s,
s->ry_upper, s->ry_upper + 1, s->ry_lower - s->ry_upper);
}
screen_make_lines(s, s->ry_lower, 1);
screen_fill_lines(
s, s->ry_lower, 1, SCREEN_DEFDATA, SCREEN_DEFATTR, SCREEN_DEFCOLR);
}
/* Scroll region down. */
void
screen_scroll_region_down(struct screen *s)
{
log_debug("scrolling region down: %u:%u", s->ry_upper, s->ry_lower);
/*
* Scroll scrolling region down:
* - delete ry_lower
* - move ry_upper to ry_lower - 1 to ry_upper + 1
* - make new line at ry_upper
*
* Example: region is 12 to 24.
* ry_lower = 24, ry_upper = 12
* screen_free_lines(s, 24, 1);
* screen_move_lines(s, 13, 12, 11);
* screen_make_lines(s, 12, 1);
*/
screen_free_lines(s, s->ry_lower, 1);
if (s->ry_upper != s->ry_lower) {
screen_move_lines(s,
s->ry_upper + 1, s->ry_upper, s->ry_lower - s->ry_upper);
}
screen_make_lines(s, s->ry_upper, 1);
screen_fill_lines(
s, s->ry_upper, 1, SCREEN_DEFDATA, SCREEN_DEFATTR, SCREEN_DEFCOLR);
}
/* Scroll screen up. */
void
screen_scroll_up(struct screen *s, u_int ny)
{
if (s->ry_upper == 0 && s->ry_lower == screen_last_y(s)) {
screen_delete_lines(s, 0, ny);
return;
}
fatalx("unimplemented");
screen_delete_lines(s, 0, ny);
}
/* Scroll screen down. */
void
screen_scroll_down(struct screen *s, u_int ny)
{
if (s->ry_upper == 0 && s->ry_lower == screen_last_y(s)) {
screen_insert_lines(s, 0, ny);
return;
}
fatalx("unimplemented");
screen_insert_lines(s, 0, ny);
}
/* Fill entire screen. */
@ -755,7 +802,6 @@ screen_insert_lines(struct screen *s, u_int py, u_int ny)
ny = screen_last_y(s) - py;
log_debug("inserting lines: %u,%u", py, ny);
/*
* Insert range of ny lines at py:
* - Free ny lines from end of screen.