1 ftrandom 2 ======== 3 4 This program expects a set of directories containing good fonts, and a set 5 of extensions of fonts to be tested. It will randomly pick a font, copy it, 6 introduce an error and then test it. 7 8 The FreeType tests are quite basic; for each erroneous font ftrandom 9 10 . forks off a new tester, 11 . initializes the library, 12 . opens each font in the file, 13 . loads each glyph, 14 . optionally reviews the contours of the glyph, 15 . optionally rasterizes the glyph, and 16 . closes the face. 17 18 If a tester takes longer than 20 seconds, ftrandom saves the erroneous font 19 and continues. If the tester exits normally or with an error, then the 20 superstructure removes the test font and continues. 21 22 23 Command line options 24 -------------------- 25 26 --all Test every font in the directory(ies) no matter 27 what its extension. 28 --check-outlines Call `FT_Outline_Decompose' on each glyph. 29 --dir <dir> Append <dir> to the list of directories to search 30 for good fonts. No recursive search. 31 --error-count <cnt> Introduce <cnt> single-byte errors into the 32 erroneous fonts (default: 1). 33 --error-fraction <frac> Multiply the file size of the font by <frac> and 34 introduce that many errors into the erroneous 35 font file. <frac> should be in the range [0;1] 36 (default: 0.0). 37 --ext <ext> Add <ext> to the set of font types tested. 38 --help Print out this list of options. 39 --nohints Specify FT_LOAD_NO_HINTING when loading glyphs. 40 --rasterize Call `FT_Render_Glyph' as well as loading it. 41 --result <dir> This is the directory in which test files are 42 placed. 43 --test <file> Run a single test on a pre-generated testcase. 44 This is done in the current process so it can be 45 debugged more easily. 46 47 The default font extensions tested by ftrandom are 48 49 .ttf .otf .ttc .cid .pfb .pfa .bdf .pcf .pfr .fon .otb .cff 50 51 The default font directory is controlled by the macro `GOOD_FONTS_DIR' in 52 the source code (and can be thus specified during compilation); its default 53 value is 54 55 /usr/local/share/fonts 56 57 The default result directory is `results' (in the current directory). 58 59 60 Compilation 61 ----------- 62 63 Two possible solutions. 64 65 . Run ftrandom within a debugging tool like `valgrind' to catch various 66 memory issues. 67 68 . Compile FreeType with sanitizer flags as provided by gcc or clang, for 69 example, then link it with ftrandom. 70