mirrors/foot
1
0
Fork 0
mirror of https://codeberg.org/dnkl/foot.git synced 2026-03-18 05:34:02 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

font: calculate underline/strikeout metrics in font, not main

Browse source
This commit is contained in:
Daniel Eklöf 2019-09-29 13:03:48 +02:00
parent 780a346071
commit 5a0bb292ee
No known key found for this signature in database
GPG key ID: 5BBD4992C116573F
2 changed files with 41 additions and 43 deletions
Download patch file Download diff file Expand all files Collapse all files

41
font.c
View file

@ -4,9 +4,12 @@
#include <stdint.h>
#include <stdbool.h>
#include <wchar.h>
#include <math.h>
#include <assert.h>
#include <threads.h>
#include <freetype/tttables.h>
#define LOG_MODULE "font"
#define LOG_ENABLE_DBG 0
#include "log.h"
@ -35,6 +38,43 @@ fini(void)
FcFini();
}
static void
underline_strikeout_metrics(struct font *font)
{
FT_Face ft_face = font->face;
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);
font->underline.position = round(ft_face->underline_position * x_scale / 64.);
font->underline.thickness = ceil(ft_face->underline_thickness * x_scale / 64.);
if (font->underline.position == 0.) {
font->underline.position = round(descent / 2.);
font->underline.thickness = fabs(round(descent / 5.));
}
LOG_DBG("underline: pos=%d, thick=%d",
font->underline.position, font->underline.thickness);
TT_OS2 *os2 = FT_Get_Sfnt_Table(ft_face, ft_sfnt_os2);
if (os2 != NULL) {
font->strikeout.position = round(os2->yStrikeoutPosition * x_scale / 64.);
font->strikeout.thickness = ceil(os2->yStrikeoutSize * x_scale / 64.);
}
if (font->strikeout.position == 0.) {
font->strikeout.position = round(height / 2. + descent);
font->strikeout.thickness = font->underline.thickness;
}
LOG_DBG("strikeout: pos=%d, thick=%d",
font->strikeout.position, font->strikeout.thickness);
}
static bool
from_font_set(FcPattern *pattern, FcFontSet *fonts, int start_idx, const font_list_t *fallbacks,
const char *attributes, struct font *font, bool is_fallback)
@ -196,6 +236,7 @@ from_font_set(FcPattern *pattern, FcFontSet *fonts, int start_idx, const font_li
}
}
underline_strikeout_metrics(font);
return true;
}