static void
vt_bitblt_char(struct vt_device *vd, struct vt_font *vf, term_char_t c,
int iscursor, unsigned int row, unsigned int col)
{
term_color_t fg, bg;
vt_determine_colors(c, iscursor, &fg, &bg);
if (vf != NULL) {
const uint8_t *src;
vt_axis_t top, left;
src = vtfont_lookup(vf, c);
/*
* Align the terminal to the centre of the screen.
* Fonts may not always be able to fill the entire
* screen.
*/
top = row * vf->vf_height + vd->vd_offset.tp_row;
left = col * vf->vf_width + vd->vd_offset.tp_col;
vd->vd_driver->vd_bitbltchr(vd, src, NULL, 0, top, left,
vf->vf_width, vf->vf_height, fg, bg);
} else {
vd->vd_driver->vd_putchar(vd, TCHAR_CHARACTER(c),
row, col, fg, bg);
}
}
const uint8_t *
vtfont_lookup(const struct vt_font *vf, term_char_t c)
{
uint32_t src;
uint16_t dst;
size_t stride;
unsigned int normal_map;
unsigned int bold_map;
/*
* No support for printing right hand sides for CJK fullwidth
* characters. Simply print a space and assume that the left
* hand side describes the entire character.
*/
src = TCHAR_CHARACTER(c);
if (TCHAR_FORMAT(c) & TF_CJK_RIGHT) {
normal_map = VFNT_MAP_NORMAL_RIGHT;
bold_map = VFNT_MAP_BOLD_RIGHT;
} else {
normal_map = VFNT_MAP_NORMAL;
bold_map = VFNT_MAP_BOLD;
}
if (TCHAR_FORMAT(c) & TF_BOLD) {
dst = vtfont_bisearch(vf->vf_map[bold_map],
vf->vf_map_count[bold_map], src);
if (dst != 0)
goto found;
}
dst = vtfont_bisearch(vf->vf_map[normal_map],
vf->vf_map_count[normal_map], src);
found:
stride = howmany(vf->vf_width, 8) * vf->vf_height;
return (&vf->vf_bytes[dst * stride]);
}
