/src/freetype/src/tools/ftrandom/README

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  1. ftrandom
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  2. --------
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  3. 

  4. This program expects a set of directories containing good fonts, and a set
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  5. of extensions of fonts to be tested.  It will randomly pick a font, copy it,
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  6. introduce and error and then test it.
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  7. 

  8. The FreeType tests are quite basic:
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  9. 

  10.   For each erroneous font it
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  11.     forks off a new tester;
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  12.     initializes the library;
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  13.     opens each font in the file;
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  14.     loads each glyph;
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  15.       (optionally reviewing the contours of the glyph)
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  16.       (optionally rasterizing)
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  17.     closes the face.
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  19. If the tester exits with a signal, or takes longer than 20 seconds then
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  20. ftrandom saves the erroneous font and continues.  If the tester exits
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  21. normally or with an error, then the superstructure removes the test font and
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  22. continues.
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  23. 

  24. Arguments are:
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  25. 

  26.   --all                    Test every font in the directory(ies) no matter
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  27.                            what its extension (some CID-keyed fonts have no
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  28.                            extension).
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  29.   --check-outlines         Call FT_Outline_Decompose on each glyph.
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  30.   --dir <dir>              Append <dir> to the list of directories to search
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  31.                            for good fonts.
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  32.   --error-count <cnt>      Introduce <cnt> single-byte errors into the
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  33.                            erroneous fonts.
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  34.   --error-fraction <frac>  Multiply the file size of the font by <frac> and
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  35.                            introduce that many errors into the erroneous
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  36.                            font file.
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  37.   --ext <ext>              Add <ext> to the set of font types tested.  Known
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  38.                            extensions are `ttf', `otf', `ttc', `cid', `pfb',
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  39.                            `pfa', `bdf', `pcf', `pfr', `fon', `otb', and
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  40.                            `cff'.
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  41.   --help                   Print out this list of options.
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  42.   --nohints                Specify FT_LOAD_NO_HINTING when loading glyphs.
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  43.   --rasterize              Call FT_Render_Glyph as well as loading it.
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  44.   --result <dir>           This is the directory in which test files are
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  45.                            placed.
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  46.   --test <file>            Run a single test on a pre-generated testcase. 
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  47.                            Done in the current process so it can be debugged
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  48.                            more easily.
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