Re: [ft-devel] FT_LOAD_VERTICAL_LAYOUT?

[Behdad Esfahbod]

On 05/05/2010 08:55 AM, David Bevan wrote:
> And how /should/ FreeType be used for vertical writing mode?


This is how cairo handles it:


/*
 * Translate glyph to match its vertical metrics.
 */
static void
_cairo_ft_scaled_glyph_vertical_layout_bearing_fix (void        *abstract_font,
                                                    FT_GlyphSlot glyph)
{
    cairo_ft_scaled_font_t *scaled_font = abstract_font;
    FT_Vector vector;

    vector.x = glyph->metrics.vertBearingX - glyph->metrics.horiBearingX;
    vector.y = -glyph->metrics.vertBearingY - glyph->metrics.horiBearingY;

    if (glyph->format == FT_GLYPH_FORMAT_OUTLINE) {
        FT_Vector_Transform (&vector, &scaled_font->unscaled->Current_Shape);
        FT_Outline_Translate(&glyph->outline, vector.x, vector.y);
    } else if (glyph->format == FT_GLYPH_FORMAT_BITMAP) {
        glyph->bitmap_left += vector.x / 64;
        glyph->bitmap_top  += vector.y / 64;
    }
}


behdad