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A pre-prosssing script to extract Glyphs of fonts

Requirements

  • python 2 or 3
  • python package FontTools v >= 3.25.0
    pip install pip install fonttools

Glyph of characters

Each character is described as a glyph which is further described by a set of closed contours. And each contour is defined by a set of points.

Each point has three attributes: the x-axis location, the y-axis location and the condition of bezier curve: on or off.

Main utilities

details see font_utils.py

  1. DONE decode: given a ttf or otf format TrueType
  2. STILL IN development normalize: normalize the EM square
  3. STILL IN development render: render a glyph
  4. STILL IN development glyph: store a glyph in local file system

An example of the Glyph formats of fonts

For the character with unicode 304f, look up the glyp table of the font (In our case, we use 'FZS3JW.TTF' provided in the src/ as an example and test case),

We could see the output of our extracted data as:

It shows that we successfully extracted the correct data.

Interesting readers about how the TrueType format could refer to

  1. An Introduction to TrueType Fonts: A look inside the TTF format
  2. and An introduction to glyphs, as used and defined in the FreeType engine:

for the details of how glyphs are represented and rendered in our machines.