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render: implement strikeout

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Daniel Eklöf 2019-07-16 15:08:02 +02:00
parent d93ca2f654
commit 06f9495ae2
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GPG key ID: 5BBD4992C116573F
3 changed files with 45 additions and 4 deletions
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25
main.c
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@ -10,6 +10,7 @@
#include <poll.h>
#include <errno.h>
#include <freetype/tttables.h>
#include <cairo-ft.h>
#include <wayland-client.h>
#include <wayland-cursor.h>
@ -376,11 +377,16 @@ main(int argc, char *const *argv)
FT_Face ft_face = cairo_ft_scaled_font_lock_face(f->font);
double x_scale = ft_face->size->metrics.x_scale / 65526.;
double height = ft_face->size->metrics.height / 64;
double descent = ft_face->size->metrics.descender / 64;
LOG_DBG("ft: x-scale: %f, height: %f, descent: %f",
x_scale, height, descent);
f->underline.position = ft_face->underline_position * x_scale / 64.;
f->underline.thickness = ft_face->underline_thickness * x_scale / 64.;
if (f->underline.position == 0.) {
double descent = ft_face->size->metrics.descender / 64;
f->underline.position = descent / 2.;
f->underline.thickness = fabs(round(descent / 5.));
}
@ -388,7 +394,24 @@ main(int argc, char *const *argv)
LOG_DBG("underline: pos=%f, thick=%f",
f->underline.position, f->underline.thickness);
TT_OS2 *os2 = FT_Get_Sfnt_Table(ft_face, ft_sfnt_os2);
if (os2 != NULL) {
f->strikeout.position = os2->yStrikeoutPosition * x_scale / 64.;
f->strikeout.thickness = os2->yStrikeoutSize * x_scale / 64.;
}
if (f->strikeout.position == 0.) {
assert(false);
/* TODO: fixme */
f->strikeout.position = height / 2. + descent;
f->strikeout.thickness = f->underline.thickness;
}
LOG_DBG("strikeout: pos=%f, thick=%f",
f->strikeout.position, f->strikeout.thickness);
cairo_ft_scaled_font_unlock_face(f->font);
}
cairo_scaled_font_extents(term.fonts[0].font, &term.fextents);