Font smoothing is a more generic term, but it turns on what wikipedia calls subpixel rendering.
If subpixel positioning is off, then each rendered glyph starts at a pixel boundary.
When subpixel positioning is on, if subpixel quantization is also on, then glyphs are constrained to only certain subpixel positions. If I recall, it currently constraints glyphs to thirds of a pixel horizontally and whole pixels vertically. This is a performance win, because it means that there are only three rasterized versions of each glyph, and these can be cached.
In a typical window context, all three are on.
On Sat, Jan 1, 2011 at 3:50 PM, Glen Low <email@hidden> wrote:
On 01/01/2011, at 11:40 PM, Scott Thompson wrote:
On Jan 1, 2011, at 5:35 AM, Glen Low wrote:
What do the various subpixel functions do in iOS 4.0 etc.?
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