Legacy Document
Important: The information in this document is obsolete and should not be used for new development.
Important: The information in this document is obsolete and should not be used for new development.
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The Horizontal Device Metrics Table
The horizontal device metrics table, with a tag name of'hdmx', is an optional table that stores integer advance widths scaled to pixel-per-em sizes for the Macintosh computer's screen. The horizontal device metrics table is used only for certain screen sizes that are determined by the font's designer and only when fractional widths are disabled (as described in "SetFractEnable" on page 4-54). This table contains fine-tuned integer widths for the glyphs at low pixel-per-em values. These values can be used to reduce the unpleasant consequences of rounding the widths for small point sizes at low resolution.
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