xref: /aoo42x/main/offapi/com/sun/star/rendering/FontMetrics.idl (revision 6d53c851)

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#ifndef __com_sun_star_rendering_FontMetrics_idl__
#define __com_sun_star_rendering_FontMetrics_idl__

module com { module sun { module star { module rendering {

/** Metrics global to the font, i.e. not specific to single
    glyphs. The font height is defined as
    ascent+descent+internalLeading, and therefore not explicitly
    included here.<p>

    Please note that when querying FontMetrics from an XCanvasFont
    interface, all values here are given relative to the font cell
    size. That means, the referenceCharWidth and/or
    ascent+descent+internalLeading will approximately (rounded to
    integer device resolution, or exactly, if fractional font
    rendering is enabled) match the referenceAdvancement/cellSize
    members of the FontRequest for which the XCanvasFont was
    queried. Please be aware that the values returned in this
    structure only map one-to-one to device pixel, if the combined
    rendering transformation for text output equals the identity
    transformation. Otherwise, the text output (and thus the resulting
    metrics) will be subject to that transformation. Depending on the
    underlying font technology, actual device output might be off by
    up to one device pixel from the transformed metrics.

    @since OpenOffice 2.0
 */
published struct FontMetrics
{
    /// Ascent (above the baseline) part of the font.
    double		Ascent;

    //-------------------------------------------------------------------------

    /// Descent (below the baseline) part of the font.
    double		Descent;

    //-------------------------------------------------------------------------

    /// Extra space above ascent
    double		InternalLeading;

    //-------------------------------------------------------------------------

    /** Extra space outside the font cells.<p>

        It should not contain ink marks and is typically used
        by the font designer to modify the line distance.<p>
     */
    double		ExternalLeading;

    //-------------------------------------------------------------------------

    /** This value specifies the reference character width of the
        font.<p>

        It's roughly equivalent to the average width of all
        characters, and if one needs a font with double character
        width, the referenceCharSize should be doubled.<p>
     */
    double          ReferenceCharSize;

    //-------------------------------------------------------------------------

    /** Specifies the offset to be added to the baseline when drawing
        underlined text.
     */
    double          UnderlineOffset;

    //-------------------------------------------------------------------------

    /** Specifies the offset to be added to the baseline when striking
        through the text.
     */
    double		StrikeThroughOffset;

};

}; }; }; };

#endif