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font: add commented out code to calculate underline/strikeout metrics

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This is just to sync the font implementation in yambar with my other
projects. Underlines and strikouts aren't (yet) used in yambar.
This commit is contained in:
Daniel Eklöf 2019-09-29 13:07:06 +02:00
parent 3cbdc13f39
commit e5fb7f32b4
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1 changed files with 45 additions and 0 deletions
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45
font.c
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@ -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"
@ -101,6 +104,46 @@ font_destroy_no_free(struct font *font)
return true;
}
/* Not used in yambar */
#if 0
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);
}
#endif
static bool
from_font_set(FcPattern *pattern, FcFontSet *fonts, int start_idx,
struct font *font, bool is_fallback)
@ -256,6 +299,8 @@ from_font_set(FcPattern *pattern, FcFontSet *fonts, int start_idx,
font->cache = calloc(glyph_cache_size, sizeof(font->cache[0]));
}
/* Not used in yambar */
/* underline_strikeout_metrics(font); */
return true;
}