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loader.efi: for text mode, use STM to scroll the whole screen

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Since local UEFI console is implemented on top of framebuffer,
we need to avoid redrawing the whole screen ourselves, but let
Simple Text Mode to do the scroll for us.
This commit is contained in:
Toomas Soome 2019-10-06 18:38:58 +00:00
parent 63fb39ba7b
commit 03c9cdf71d
1 changed files with 25 additions and 6 deletions
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31
stand/efi/libefi/efi_console.c
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@ -136,7 +136,7 @@ efi_text_cursor(void *s __unused, const teken_pos_t *p)
}
static void
efi_text_printchar(const teken_pos_t *p)
efi_text_printchar(const teken_pos_t *p, bool autoscroll)
{
UINTN a, attr;
struct text_pixel *px;
@ -164,7 +164,8 @@ efi_text_printchar(const teken_pos_t *p)
conout->SetCursorPosition(conout, p->tp_col, p->tp_row);
/* to prvent autoscroll, skip print of lower right char */
if (p->tp_row == tp.tp_row - 1 &&
if (!autoscroll &&
p->tp_row == tp.tp_row - 1 &&
p->tp_col == tp.tp_col - 1)
return;
@ -183,7 +184,7 @@ efi_text_putchar(void *s __unused, const teken_pos_t *p, teken_char_t c,
idx = p->tp_col + p->tp_row * tp.tp_col;
buffer[idx].c = c;
buffer[idx].a = *a;
efi_text_printchar(p);
efi_text_printchar(p, false);
}
static void
@ -226,6 +227,7 @@ efi_text_copy(void *ptr __unused, const teken_rect_t *r, const teken_pos_t *p)
int srow, drow;
int nrow, ncol, x, y; /* Has to be signed - >= 0 comparison */
teken_pos_t d, s;
bool scroll = false;
/*
* Copying is a little tricky. We must make sure we do it in
@ -235,6 +237,13 @@ efi_text_copy(void *ptr __unused, const teken_rect_t *r, const teken_pos_t *p)
nrow = r->tr_end.tp_row - r->tr_begin.tp_row;
ncol = r->tr_end.tp_col - r->tr_begin.tp_col;
/*
* Check if we do copy whole screen.
*/
if (p->tp_row == 0 && p->tp_col == 0 &&
nrow == tp.tp_row - 2 && ncol == tp.tp_col - 2)
scroll = true;
conout->EnableCursor(conout, FALSE);
if (p->tp_row < r->tr_begin.tp_row) {
/* Copy from bottom to top. */
@ -252,7 +261,17 @@ efi_text_copy(void *ptr __unused, const teken_rect_t *r, const teken_pos_t *p)
&buffer[s.tp_col + srow])) {
buffer[d.tp_col + drow] =
buffer[s.tp_col + srow];
efi_text_printchar(&d);
if (!scroll)
efi_text_printchar(&d, false);
} else if (scroll) {
/*
* Draw last char and trigger
* scroll.
*/
if (y == nrow - 1 &&
x == ncol - 1) {
efi_text_printchar(&d, true);
}
}
}
}
@ -274,7 +293,7 @@ efi_text_copy(void *ptr __unused, const teken_rect_t *r, const teken_pos_t *p)
&buffer[s.tp_col + srow])) {
buffer[d.tp_col + drow] =
buffer[s.tp_col + srow];
efi_text_printchar(&d);
efi_text_printchar(&d, false);
}
}
}
@ -294,7 +313,7 @@ efi_text_copy(void *ptr __unused, const teken_rect_t *r, const teken_pos_t *p)
&buffer[s.tp_col + srow])) {
buffer[d.tp_col + drow] =
buffer[s.tp_col + srow];
efi_text_printchar(&d);
efi_text_printchar(&d, false);
}
}
}