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hb-font: Fix scale_glyph_extents() again 

And better fix this time.
This commit is contained in:
Behdad Esfahbod 2023-01-09 11:54:44 -07:00
parent 6c1a4bed4a
commit 30adbc22d9
1 changed files with 12 additions and 6 deletions
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18
src/hb-font.hh
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@ -182,14 +182,20 @@ struct hb_font_t
void scale_glyph_extents (hb_glyph_extents_t *extents)
{
extents->x_bearing = em_scale_x (extents->x_bearing);
extents->y_bearing = em_scale_y (extents->y_bearing);
extents->width = em_scale_x (extents->x_bearing + extents->width) - extents->x_bearing;
extents->height = em_scale_y (extents->y_bearing + extents->height) - extents->y_bearing;
float x1 = em_fscale_x (extents->x_bearing);
float y1 = em_fscale_y (extents->y_bearing);
float x2 = em_fscale_x (extents->x_bearing + extents->width);
float y2 = em_fscale_y (extents->y_bearing + extents->height);
/* Apply slant. */
extents->x_bearing += roundf (extents->y_bearing * slant_xy);
extents->width += roundf (extents->height * slant_xy);
x1 += hb_min (y1 * slant_xy, y2 * slant_xy);
x2 += hb_max (y1 * slant_xy, y2 * slant_xy);
extents->x_bearing = floorf (x1);
extents->y_bearing = floorf (y1);
extents->width = ceilf (x2) - extents->x_bearing;
extents->height = ceilf (y2) - extents->y_bearing;
}