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opencv_contrib/modules/freetype
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Kumataro 9b5a801148 Merge pull request #2776 from Kumataro:master_freetype2_doc 
freetype2: Fix comments in freetype.hpp and README.md

* freetype2: Update README.md

* freetype2: Update freetype.hpp

* freetype2: remove new blank line

* Update README.md

- Remove dots from the Headers
- Align number of === / --- symbols on the next line

* freetype: remove comment for color.
2020-12-07 20:37:50 +00:00
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include/opencv2
Merge pull request #2776 from Kumataro:master_freetype2_doc
2020-12-07 20:37:50 +00:00
src
freetype2: Fix 'A function call in freetype.cpp causes overflow'
2020-09-26 18:52:44 +09:00
CMakeLists.txt
cmake: use ocv_check_modules()
2019-04-15 22:11:44 +00:00
README.md
Merge pull request #2776 from Kumataro:master_freetype2_doc
2020-12-07 20:37:50 +00:00

README.md

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.

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.