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add bottom line

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This commit is contained in:
catfood 2022-12-24 21:42:44 +08:00
parent c28bd0ec7b
commit c8584cd8a1
2 changed files with 9 additions and 3 deletions
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3
include/tty.h
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@ -68,7 +68,8 @@ typedef struct vga_buf
void *buf; // 2d array, screen size, for text mode it's [maxline][80]
int max_line; // to support scroll, max line should be a lot more than screen
int scr_top_line; // the index in buf of top line on screen;
int scr_cur_line; // the index in buf of the cursor's line
int scr_cur_line; // the index in buf of the cursor's line;
int scr_bot_line; // the index in buf of the most-bottom printed line
int head_line; // for circular buffer use
int cur_row;
int cur_col; // cursor position, on screen

9
kernel/vga.c
View File

@ -132,7 +132,7 @@ void vga_tty_init(NTTY *tty)
// kprintf("malloced %p %p %p\n", vga->buf, &vga->buf, &vga->scr_top_line);
vga->cur_col = vga->cur_row = 0;
// buf->max_line = SCR_BUFSIZE / SCR_WIDTH;
vga->scr_top_line = vga->scr_cur_line = 0;
vga->scr_top_line = vga->scr_cur_line = vga->scr_bot_line = 0;
vga->head_line = 0;
u32 *ptr_buf = (u32 *)vga->buf;
for (int i = 0; i < SCR_BUFSIZE * sizeof(u16) / sizeof(u32); ++i)
@ -551,6 +551,9 @@ void vga_tty_write(NTTY *tty, char ch)
}
}
vga->cur_row = CYCLE_SUB(vga->scr_top_line, vga->scr_cur_line, SCR_MAXLINE);
if (CYCLE_SUB(vga->head_line, vga->scr_cur_line, SCR_MAXLINE) >= CYCLE_SUB(vga->head_line, vga->scr_bot_line, SCR_MAXLINE)){
vga->scr_bot_line = vga->scr_cur_line;
}
// kprintf("row: %d; ", vga->cur_row);
}
@ -577,6 +580,8 @@ void vga_tty_flush(NTTY *tty)
u16 *buf = vga->buf;
int i, cur_line;
vga_set_cursor(INDEX(vga->cur_row, vga->cur_col));
vga->cur_row = CYCLE_SUB(vga->scr_top_line, vga->scr_cur_line, SCR_MAXLINE);
int bottom = min(max(vga->cur_row, CYCLE_SUB(vga->scr_top_line, vga->scr_bot_line, SCR_MAXLINE)), SCR_HEIGHT);
// if (vga->cur_row == SCR_HEIGHT - 1)
// {
// vga_flush_screen(&buf[INDEX(vga->scr_top_line, 0)]);
@ -585,7 +590,7 @@ void vga_tty_flush(NTTY *tty)
// else
// {
cur_line = vga->scr_top_line;
for (i = 0; i <= vga->cur_row; ++i)
for (i = 0; i <= bottom; ++i)
{
vga_flush_line(&buf[INDEX(cur_line, 0)], i);
cur_line = NEXTLINE(cur_line);