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Right, I think we now hove scrolling optimisations. They should probably be

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conditional on something, but I can't be bothered right now.

[originally from svn r67]
This commit is contained in:
Ben Harris
1999-03-02 21:51:55 +00:00
parent 0ce1d562c6
commit 2145f64798
3 changed files with 47 additions and 3 deletions
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27
terminal.c
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@ -97,6 +97,7 @@ static void erase_lots (int, int, int);
static void swap_screen (int);
static void update_sbar (void);
static void deselect (void);
static void scroll_display(int, int, int);
/*
* Set up power-on settings for the terminal.
@ -400,10 +401,30 @@ static void scroll (int topline, int botline, int lines, int sb) {
selend = scroll_top + size + scroll_size;
}
}
scroll_heuristic += lines;
scroll_display(topline, botline, lines);
}
static void scroll_display(int topline, int botline, int lines) {
unsigned long *start, *end;
int distance, size, i;
start = disptext + topline * (cols + 1);
end = disptext + (botline + 1) * (cols + 1);
distance = (lines > 0 ? lines : -lines) * (cols + 1);
size = end - start - distance;
if (lines > 0) {
memmove(start, start + distance, size * TSIZE);
for (i = 0; i < distance; i++)
(start + size)[i] |= ATTR_INVALID;
} else {
memmove(start + distance, start, size * TSIZE);
for (i = 0; i < distance; i++)
start[i] |= ATTR_INVALID;
}
do_scroll(topline, botline, lines);
}
/*
* Move the cursor to a given position, clipping at boundaries. We
* may or may not want to clip at the scroll margin: marg_clip is 0
@ -1282,6 +1303,8 @@ void term_scroll (int rel, int where) {
if (disptop > scrtop)
disptop = scrtop;
update_sbar();
if (rel == 0 && where < rows && where > -rows)
scroll_display(0, rows - 1, where);
term_update();
}