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Retrieving Glyph Metrics

ATSUI lets you retrieve the ideal (resolution-independent) glyph metrics by calling the function ATSUGlyphGetIdealMetrics and the screen (resolution-dependent) metrics by calling the function ATSUGlyphGetScreenMetrics.

You can use the function ATSUGlyphGetIdealMetrics to obtain

• the advance of the glyph—the amount by which the pen is advanced after drawing the glyph

• the origin-side bearing of the glyph—the offset from the glyph origin to the beginning of the glyph image

• the end-side bearing of the glyph—the offset from the end of the glyph image to the end of the glyph advance

You can use the function ATSUGlyphGetScreenMetrics to obtain

• the device advance—the number of pixels of the advance for the glyph as actually drawn on the screen

• the top-left point of the glyph in device coordinates

• the height and width of the glyph in pixels; the glyph specified by these values may overlap with other glyphs when drawn

• the origin-side bearing and trailing-side bearing in pixels

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