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3951e0338a
freetype: support 8UC1/8UC4 image * freetype: add parameter test * freetype: support CV_8UC3 and CV_8C4 * freetype:fix for gcc5.4 * freetype: delete newline * freetype:fix for python binding * freetype: Revert 3rd argument type of loadFontData() to use int. - Revert 3rd argument type of loadFontData() to use "int". - Use cvtest::debugLevel instead to OUTPUT_FILE define. - Change type of idx_range list and ctol_range list to use "int". - fix typo.
FreeType2 Wrapper Module
This FreeType2 wrapper module allows to draw strings with outlines and bitmaps.
Requested external libraries
harfbuzz is requested to convert UTF8 to gid(GlyphID).
freetype library is requested to rasterize given gid.
- harfbuzz https://www.freedesktop.org/wiki/Software/HarfBuzz/
- freetype https://www.freetype.org/
Usage
cv::Ptr<cv::freetype::FreeType2> ft2;
ft2 = cv::freetype::createFreeType2();
ft2->loadFontData(ttf_pathname, 0);
ft2->putText(mat, "hello world", cv::Point(20, 200),
30, CV_RGB(0, 0, 0), cv::FILLED, cv::LINE_AA, true);
Option
- 2nd argument of loadFontData is used if font file has many font data.
- 3 drawing mode is available.
- outline mode is used if lineWidth is larger than 0. (like original putText)
- bitmap mode is used if lineWidth is less than 0.
- 1bit bitmap mode is used if lineStyle is 4 or 8.
- gray bitmap mode is used if lineStyle is 16.