TTCFont


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TTCFont

Last updated at 9:49 am UTC on 4 March 2022

Subclass of AbstractFont

Class comment:

I represent a font that uses TrueType derived glyph. Upon a request for glyph for a character through a call to #formOf: (or #widthOf:), I first search corresponding glyph in the cache. If there is not, it creates a 32bit depth form with the glyph.

The cache is weakly held. The entries are zapped at full GC.

Structure:

ttcDescription TTFontDescription – The Squeak data structure for a TrueType font data file.
pointSize Number – Nominal Em size in points. Conversion to pixel sizes depends on the definition of TextStyle class>>pixelsPerInch.
foregroundColor Color – So far, this font need to know the glyph color in cache.
cache WeakArray of <Color -> <Array(256) of glyph>>
derivatives Array – stores the fonts in the same family but different emphasis.

Important method:

 displayString: aString on: aBitBlt from: startIndex to: stopIndex at: aPoint kern: kernDelta baselineY: baselineY

 displayString:on:from:to:at:kern:baselineY:

This method is called from

   DisplayText composeForm

through

 Project composeDisplayTextIntoForm: displayText

It uses TTGlyph to create an instance of Form.

March 2022: new import method, see comment.

 TTCFont class >> #installFromFileNames:
 TTCFont class >> #uninstallFontNames:

See also