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[Vertical] Do fallback origin calculation

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This commit is contained in:
Behdad Esfahbod 2011-05-19 19:08:57 -04:00
parent 60fbb36096
commit 67d51ff961
1 changed files with 27 additions and 5 deletions
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32
src/hb-font.cc
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@ -71,7 +71,7 @@ hb_font_get_glyph_h_advance_nil (hb_font_t *font HB_UNUSED,
return;
}
*advance = 0;
*advance = font->x_scale;
}
static void
@ -89,7 +89,7 @@ hb_font_get_glyph_v_advance_nil (hb_font_t *font HB_UNUSED,
return;
}
*advance = 0;
*advance = font->y_scale;
}
static hb_bool_t
@ -450,6 +450,21 @@ hb_font_get_glyph_advance_for_direction (hb_font_t *font,
}
}
static void
guess_v_origin_minus_h_origin (hb_font_t *font,
hb_codepoint_t glyph,
hb_position_t *x, hb_position_t *y)
{
*x = *y = 0;
hb_font_get_glyph_h_advance (font, glyph, x);
*x /= 2;
/* TODO use font_metics.ascent */
*y = font->y_scale;
}
void
hb_font_get_glyph_origin_for_direction (hb_font_t *font,
hb_codepoint_t glyph,
@ -457,11 +472,18 @@ hb_font_get_glyph_origin_for_direction (hb_font_t *font,
hb_position_t *x, hb_position_t *y)
{
if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
hb_font_get_glyph_h_origin (font, glyph, x, y);
hb_bool_t ret = hb_font_get_glyph_h_origin (font, glyph, x, y);
if (!ret && (ret = hb_font_get_glyph_v_origin (font, glyph, x, y))) {
hb_position_t dx, dy;
guess_v_origin_minus_h_origin (font, glyph, &dx, &dy);
*x -= dx; *y -= dy;
}
} else {
hb_bool_t ret = hb_font_get_glyph_v_origin (font, glyph, x, y);
if (!ret) {
/* TODO return h_origin/2. and font_extents.ascent */
if (!ret && (ret = hb_font_get_glyph_h_origin (font, glyph, x, y))) {
hb_position_t dx, dy;
guess_v_origin_minus_h_origin (font, glyph, &dx, &dy);
*x += dx; *y += dy;
}
}
}