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[ft] Fix slanting code

This commit is contained in:
Behdad Esfahbod 2023-01-09 13:36:55 -07:00
parent eb0f0279d2
commit 73dab7f784
1 changed files with 12 additions and 6 deletions
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18
src/hb-ft.cc
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@ -603,6 +603,7 @@ hb_ft_get_glyph_extents (hb_font_t *font,
hb_lock_t lock (ft_font->lock);
FT_Face ft_face = ft_font->ft_face;
float x_mult, y_mult;
float slant_xy = font->slant_xy;
#ifdef HAVE_FT_GET_TRANSFORM
if (ft_font->transform)
{
@ -623,14 +624,19 @@ hb_ft_get_glyph_extents (hb_font_t *font,
if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags)))
return false;
extents->x_bearing = (hb_position_t) (x_mult * ft_face->glyph->metrics.horiBearingX);
extents->y_bearing = (hb_position_t) (y_mult * ft_face->glyph->metrics.horiBearingY);
extents->width = (hb_position_t) (x_mult * ft_face->glyph->metrics.width);
extents->height = (hb_position_t) (y_mult * -ft_face->glyph->metrics.height);
float x1 = x_mult * ft_face->glyph->metrics.horiBearingX;
float y1 = y_mult * ft_face->glyph->metrics.horiBearingY;
float x2 = x1 + x_mult * ft_face->glyph->metrics.width;
float y2 = y1 + y_mult * -ft_face->glyph->metrics.height;
/* Apply slant. */
extents->x_bearing += roundf (extents->y_bearing * font->slant_xy);
extents->width += roundf (extents->height * font->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;
return true;
}