Add imgproc TrueType text rendering: FontFace + FontFace-based PutText/GetTextSize - #1929
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Wraps the OpenCV 5 built-in STB TrueType renderer (replacing the contrib
freetype module):
- FontFace class: default / embedded ("sans", "italic", "uni") / custom-path
fonts, plus Set, Name, SetInstance / GetInstance (variable-font axes).
- Cv2.PutText and Cv2.GetTextSize overloads taking a FontFace (size, weight,
PutTextFlags, optional wrap Range). Text is marshaled as UTF-8 so full
Unicode renders correctly.
- PutTextFlags enum (align / origin / wrap).
Native entry points in a new imgproc_FontFace.h; font path/name strings use
the Windows/NotWindows marshaling split while text content uses UTF-8.
Tests: FontFace creation (default + embedded), GetTextSize, ASCII + Unicode
PutText pixel checks, and SetInstance/GetInstance. Full ImgProc suite green
(142 passed).
Refs #1924.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Jun 25, 2026
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Summary
Wraps the OpenCV 5 built-in STB TrueType text renderer (which replaces the contrib
freetypemodule) — from #1924.New API
FontFaceclass: default font, embedded fonts ("sans","italic","uni"), or a custom font path. ExposesSet,Name, andSetInstance/GetInstancefor variable-font axes (e.g.wght,slnt).Cv2.PutText/Cv2.GetTextSizeoverloads taking aFontFace(fontsize,weight,PutTextFlags, optional wrapRange).PutTextreturns the continuation point;GetTextSizereturns the boundingRect.PutTextFlagsenum (align / origin / wrap).Text is marshaled as UTF-8, so full Unicode renders correctly (unlike the legacy Hershey
PutText, which is ANSI).Native bridge
imgproc_FontFace.h(included fromimgproc.cpp).Test
FontFaceTest:sans,uni).GetTextSizereturns a positive-sized rect.PutTextdraws pixels and advances the cursor (ASCII).PutTextwith a Unicode string (Greek + Cyrillic) using theunifont draws pixels.SetInstance/GetInstanceround-trip wiring.Rebuilt
OpenCvSharpExternlocally; full ImgProc suite green (142 passed).Refs #1924.
🤖 Generated with Claude Code