Smallcache #38
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Smallcache #38
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Note; the unprintable glyph replacement hex font has grown by 50%. This increases the visibility of the replacement font at low resolutions. |
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This change adds a cache for already-seen glyphs. The changes affect mainly the font subpackage.
There is no package API breakage in this change. Although it may cause issues in situations where the selected font is meant to be "transparent". This was not considered is because that feature doesn't work anyway.
There is a plan to make this change conditional, only occuring with foreground colors that have opaque alpha channels.
The change works by inserting a cache into frame/font.StringBG. On each call to StringBG, StringBG checks to see if a glyph from a font face has already been printed. If it has, it accesses an opaque image of the font with that certain background color from its cache and performs a src draw.Draw instead of a draw.Over with the font mask.
Some other housekeeping changes apply to other files, along with some new function that are not used at this time (deconvolution of small/blurry fonts).