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Mastering Android NDK by Viktor Latypov, Sergey Kosarevsky

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Text rendering

In this section, we describe every essential detail of the text rendering process implemented in the clTextRenderer class. Here are the parts of our text renderer:

  • UTF-8 string decoding (http://en.wikipedia.org/wiki/UTF-8)
  • Text size calculation, kerning, and advance calculation
  • Rendering of individual glyph, just like the one in the FreeType example from Chapter 2, Native Libraries
  • Fonts and glyphs loading and caching
  • String rendering

We assume all the strings are in the UTF-8 encoding because this way all Latin characters with ASCII codes between 0 and 127 take exactly one byte, and various national symbols take up to four bytes. The only problem with UTF-8 is that FreeType accepts fixed-width 2-byte UCS-2 encoding, so we have to include ...

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