Add Freetype font support to PutText()

Dockerfile.opencv

@@ -18,6 +18,7 @@ RUN apt-get update && apt-get install -y \
       git build-essential cmake pkg-config unzip libgtk2.0-dev \
       curl ca-certificates libcurl4-openssl-dev libssl-dev \
       libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+      libharfbuzz-dev libfreetype6-dev \
       libjpeg62-turbo-dev libpng-dev libtiff-dev libdc1394-22-dev nasm && \
       rm -rf /var/lib/apt/lists/*
 
@@ -44,6 +45,7 @@ RUN cd opencv-${OPENCV_VERSION} && \
       -D WITH_IPP=OFF \
       -D WITH_OPENGL=OFF \
       -D WITH_QT=OFF \
+      -D WITH_FREETYPE=ON \
       -D CMAKE_INSTALL_PREFIX=/usr/local \
       -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-${OPENCV_VERSION}/modules \
       -D OPENCV_ENABLE_NONFREE=ON \
@@ -77,6 +79,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
       git build-essential cmake pkg-config unzip libgtk2.0-dev \
       curl ca-certificates libcurl4-openssl-dev libssl-dev \
       libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+      libharfbuzz-dev libfreetype6-dev \
       libjpeg62-turbo-dev libpng-dev libtiff-dev libdc1394-22-dev && \
       apt-get autoremove -y && apt-get autoclean -y
 
@@ -113,6 +116,7 @@ RUN cd opencv-${OPENCV_VERSION} && \
       -D WITH_LIBV4L=ON \
       -D WITH_VTK=OFF \
       -D WITH_QT=OFF \
+      -D WITH_FREETYPE=ON \
       -D BUILD_JPEG=ON \
       -D OPENCV_ENABLE_NONFREE=ON \
       -D BUILD_DOCS=OFF \

Dockerfile.opencv-gpu-cuda-11

@@ -9,6 +9,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     git build-essential cmake pkg-config unzip libgtk2.0-dev \
     wget curl ca-certificates libcurl4-openssl-dev libssl-dev \
     libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+    libharfbuzz-dev libfreetype6-dev \
     libjpeg-turbo8-dev libpng-dev libtiff-dev libdc1394-22-dev nasm && \
     rm -rf /var/lib/apt/lists/*
 
@@ -32,6 +33,7 @@ RUN curl -Lo opencv.zip ${OPENCV_FILE} && \
     -D WITH_IPP=OFF \
     -D WITH_OPENGL=OFF \
     -D WITH_QT=OFF \
+    -D WITH_FREETYPE=ON \
     -D CMAKE_INSTALL_PREFIX=/usr/local \
     -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-${OPENCV_VERSION}/modules \
     -D OPENCV_ENABLE_NONFREE=ON \

Dockerfile.opencv-gpu-cuda-11.2.2

@@ -9,6 +9,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     git build-essential cmake pkg-config unzip libgtk2.0-dev \
     wget curl ca-certificates libcurl4-openssl-dev libssl-dev \
     libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+    libharfbuzz-dev libfreetype6-dev \
     libjpeg-turbo8-dev libpng-dev libtiff-dev libdc1394-22-dev nasm && \
     rm -rf /var/lib/apt/lists/*
 
@@ -32,6 +33,7 @@ RUN curl -Lo opencv.zip ${OPENCV_FILE} && \
     -D WITH_IPP=OFF \
     -D WITH_OPENGL=OFF \
     -D WITH_QT=OFF \
+    -D WITH_FREETYPE=ON \
     -D CMAKE_INSTALL_PREFIX=/usr/local \
     -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-${OPENCV_VERSION}/modules \
     -D OPENCV_ENABLE_NONFREE=ON \

Dockerfile.opencv-gpu-cuda-12

@@ -9,6 +9,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     git build-essential cmake pkg-config unzip libgtk2.0-dev \
     wget curl ca-certificates libcurl4-openssl-dev libssl-dev \
     libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+    libharfbuzz-dev libfreetype6-dev \
     libjpeg-turbo8-dev libpng-dev libtiff-dev libdc1394-dev nasm && \
     rm -rf /var/lib/apt/lists/*
 
@@ -32,6 +33,7 @@ RUN curl -Lo opencv.zip ${OPENCV_FILE} && \
     -D WITH_IPP=OFF \
     -D WITH_OPENGL=OFF \
     -D WITH_QT=OFF \
+    -D WITH_FREETYPE=ON \
     -D CMAKE_INSTALL_PREFIX=/usr/local \
     -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-${OPENCV_VERSION}/modules \
     -D OPENCV_ENABLE_NONFREE=ON \

Dockerfile.opencv-static

@@ -18,6 +18,7 @@ RUN apt-get update && apt-get install -y \
       git build-essential cmake pkg-config unzip libgtk2.0-dev \
       curl ca-certificates libcurl4-openssl-dev libssl-dev \
       libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+      libharfbuzz-dev libfreetype6-dev \
       libjpeg62-turbo-dev libpng-dev libtiff-dev libdc1394-22-dev nasm && \
       rm -rf /var/lib/apt/lists/*
 
@@ -46,6 +47,7 @@ RUN cd opencv-${OPENCV_VERSION} && \
       -D BUILD_IPP_IW=ON \
       -D WITH_OPENGL=OFF \
       -D WITH_QT=OFF \
+      -D WITH_FREETYPE=ON \
       -D CMAKE_INSTALL_PREFIX=/usr/local \
       -D BUILD_SHARED_LIBS=OFF \
       -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-${OPENCV_VERSION}/modules \
@@ -79,6 +81,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
       git build-essential cmake pkg-config unzip libgtk2.0-dev \
       curl ca-certificates libcurl4-openssl-dev libssl-dev \
       libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+      libharfbuzz-dev libfreetype6-dev \
       libjpeg62-turbo-dev libpng-dev libtiff-dev libdc1394-22-dev && \
       rm -rf /var/lib/apt/lists/*
 
@@ -105,6 +108,7 @@ RUN cd opencv-${OPENCV_VERSION} && \
       -D WITH_IPP=OFF \
       -D WITH_OPENGL=OFF \
       -D WITH_QT=OFF \
+      -D WITH_FREETYPE=ON \
       -D CMAKE_INSTALL_PREFIX=/usr/local \
       -D BUILD_SHARED_LIBS=OFF \
       -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-${OPENCV_VERSION}/modules \

Dockerfile.opencv-ubuntu-18.04

@@ -8,6 +8,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
       git build-essential cmake pkg-config wget unzip libgtk2.0-dev \
       curl ca-certificates libcurl4-openssl-dev libssl-dev \
       libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+      libharfbuzz-dev libfreetype6-dev \
       libjpeg-turbo8-dev libpng-dev libtiff-dev libdc1394-22-dev nasm && \
       rm -rf /var/lib/apt/lists/*
 
@@ -31,6 +32,7 @@ RUN curl -Lo opencv.zip ${OPENCV_FILE} && \
       -D WITH_IPP=OFF \
       -D WITH_OPENGL=OFF \
       -D WITH_QT=OFF \
+      -D WITH_FREETYPE=ON \
       -D CMAKE_INSTALL_PREFIX=/usr/local \
       -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-${OPENCV_VERSION}/modules \
       -D OPENCV_ENABLE_NONFREE=ON \

Dockerfile.opencv-ubuntu-20.04

@@ -11,6 +11,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
       tzdata git build-essential cmake pkg-config wget unzip libgtk2.0-dev \
       curl ca-certificates libcurl4-openssl-dev libssl-dev \
       libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+      libharfbuzz-dev libfreetype6-dev \
       libjpeg-turbo8-dev libpng-dev libtiff-dev libdc1394-22-dev nasm && \
       rm -rf /var/lib/apt/lists/*
 
@@ -34,6 +35,7 @@ RUN curl -Lo opencv.zip ${OPENCV_FILE} && \
       -D WITH_IPP=OFF \
       -D WITH_OPENGL=OFF \
       -D WITH_QT=OFF \
+      -D WITH_FREETYPE=ON \
       -D CMAKE_INSTALL_PREFIX=/usr/local \
       -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-${OPENCV_VERSION}/modules \
       -D OPENCV_ENABLE_NONFREE=ON \

Dockerfile.opencv-ubuntu-22.04

@@ -11,6 +11,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
       tzdata git build-essential cmake pkg-config wget unzip libgtk2.0-dev \
       curl ca-certificates libcurl4-openssl-dev libssl-dev \
       libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev \
+      libharfbuzz-dev libfreetype6-dev \
       libjpeg-turbo8-dev libpng-dev libtiff-dev libdc1394-dev nasm && \
       rm -rf /var/lib/apt/lists/*
 
@@ -34,6 +35,7 @@ RUN curl -Lo opencv.zip ${OPENCV_FILE} && \
       -D WITH_IPP=OFF \
       -D WITH_OPENGL=OFF \
       -D WITH_QT=OFF \
+      -D WITH_FREETYPE=ON \
       -D CMAKE_INSTALL_PREFIX=/usr/local \
       -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-${OPENCV_VERSION}/modules \
       -D OPENCV_ENABLE_NONFREE=ON \

Makefile

@@ -2,7 +2,7 @@
 .PHONY: test deps download build clean astyle cmds docker
 
 # GoCV version to use.
-GOCV_VERSION?="v0.35.0"
+GOCV_VERSION?="v0.37.0"
 
 # OpenCV version to use.
 OPENCV_VERSION?=4.10.0
@@ -18,9 +18,9 @@ BUILD_SHARED_LIBS?=ON
 
 # Package list for each well-known Linux distribution
 RPMS=cmake curl wget git gtk2-devel libpng-devel libjpeg-devel libtiff-devel tbb tbb-devel libdc1394-devel unzip gcc-c++
-DEBS=unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-22-dev
-DEBS_BOOKWORM=unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbbmalloc2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev
-DEBS_UBUNTU_JAMMY=unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-dev
+DEBS=unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-22-dev libharfbuzz-dev libfreetype6-dev
+DEBS_BOOKWORM=unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbbmalloc2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libharfbuzz-dev libfreetype6-dev
+DEBS_UBUNTU_JAMMY=unzip wget build-essential cmake curl git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-dev libharfbuzz-dev libfreetype6-dev
 JETSON=build-essential cmake git unzip pkg-config libjpeg-dev libpng-dev libtiff-dev libavcodec-dev libavformat-dev libswscale-dev libgtk2.0-dev libcanberra-gtk* libxvidcore-dev libx264-dev libgtk-3-dev libtbb2 libtbb-dev libdc1394-22-dev libv4l-dev v4l-utils libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libavresample-dev libvorbis-dev libxine2-dev libfaac-dev libmp3lame-dev libtheora-dev libopencore-amrnb-dev libopencore-amrwb-dev libopenblas-dev libatlas-base-dev libblas-dev liblapack-dev libeigen3-dev gfortran libhdf5-dev protobuf-compiler libprotobuf-dev libgoogle-glog-dev libgflags-dev
 
 explain:
@@ -128,9 +128,9 @@ build_raspi:
 	cd build
 	rm -rf *
 ifneq ($(shell uname -m | grep "aarch64"),)
-	cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=OFF -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D ENABLE_NEON=ON -D WITH_JASPER=OFF -D WITH_TBB=ON -D OPENCV_GENERATE_PKGCONFIG=ON ..
+	cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=OFF -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D ENABLE_NEON=ON -D WITH_JASPER=OFF -D WITH_TBB=ON -D OPENCV_GENERATE_PKGCONFIG=ON -D WITH_FREETYPE=ON ..
 else
-	cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=OFF -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D ENABLE_NEON=ON -D ENABLE_VFPV3=ON -D WITH_JASPER=OFF -D OPENCV_GENERATE_PKGCONFIG=ON ..
+	cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS} -D OPENCV_EXTRA_MODULES_PATH=$(TMP_DIR)opencv/opencv_contrib-$(OPENCV_VERSION)/modules -D BUILD_DOCS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=ON -D BUILD_opencv_java=OFF -D BUILD_opencv_python=NO -D BUILD_opencv_python2=NO -D BUILD_opencv_python3=NO -D ENABLE_NEON=ON -D ENABLE_VFPV3=ON -D WITH_JASPER=OFF -D OPENCV_GENERATE_PKGCONFIG=ON -D WITH_FREETYPE=ON ..
 endif
 	$(MAKE) -j $(shell nproc --all --ignore 1)
 	$(MAKE) preinstall

ROADMAP.md

@@ -316,7 +316,7 @@ Your pull requests will be greatly appreciated!
 - [ ] dnn_superres. DNN used for super resolution
 - [ ] dpm. Deformable Part-based Models
 - [ ] **face. Face Recognition - WORK STARTED**
-- [ ] freetype. Drawing UTF-8 strings with freetype/harfbuzz
+- [X] freetype. Drawing UTF-8 strings with freetype/harfbuzz
 - [ ] fuzzy. Image processing based on fuzzy mathematics
 - [ ] hdf. Hierarchical Data Format I/O routines
 - [ ] hfs. Hierarchical Feature Selection for Efficient Image Segmentation

contrib/freetype.cpp

@@ -0,0 +1,36 @@
+
+#ifndef _WIN32  // Exclude compiling on Windows platforms
+
+#include "freetype.h"
+
+FreeType2 FreeType2_CreateFreeType2() {
+    return new cv::Ptr<cv::freetype::FreeType2>(cv::freetype::createFreeType2());
+}
+
+void FreeType2_Close(FreeType2 f) {
+    delete f;
+}
+
+void FreeType2_LoadFontData(FreeType2 f, const char *fontFileName, int id) {
+    (*f)->loadFontData(fontFileName, id);
+}
+
+void FreeType2_SetSplitNumber(FreeType2 f, int num) {
+    (*f)->setSplitNumber(num);
+}
+
+void FreeType2_PutText(FreeType2 f, Mat img, const char *text, Point org,
+                       int fontHeight, Scalar color,
+                       int thickness, int line_type, bool bottomLeftOrigin) {
+    cv::Point pt(org.x, org.y);
+    cv::Scalar c = cv::Scalar(color.val1, color.val2, color.val3, color.val4);
+    (*f)->putText(*img, text, pt, fontHeight, c, thickness, line_type, bottomLeftOrigin);
+}
+
+Size FreeType2_GetTextSize(FreeType2 f, const char *text,
+                           int fontHeight, int thickness, int *baseLine) {
+    cv::Size sz = (*f)->getTextSize(text, fontHeight, thickness, baseLine);
+    return Size{sz.width, sz.height};
+}
+
+#endif // _WIN32

contrib/freetype.go

@@ -0,0 +1,100 @@
+//go:build linux
+
+package contrib
+
+/*
+#include <stdlib.h>
+#include "freetype.h"
+*/
+import "C"
+import (
+	"image"
+	"image/color"
+	"unsafe"
+
+	"gocv.io/x/gocv"
+)
+
+type FreeType2 struct {
+	// C.FreeType2
+	p unsafe.Pointer
+}
+
+// NewFreeType2 create instance to draw UTF-8 strings.
+//
+// For further details, please see:
+// https://docs.opencv.org/master/d4/dfc/group__freetype.html#ga0fd8f9c0ae69bb4d95c41af79473a756
+func NewFreeType2() FreeType2 {
+	return FreeType2{p: unsafe.Pointer(C.FreeType2_CreateFreeType2())}
+}
+
+// Close FreeType2.
+func (f *FreeType2) Close() error {
+	C.FreeType2_Close((C.FreeType2)(f.p))
+	f.p = nil
+	return nil
+}
+
+// LoadFontData loads font data.
+//
+// For further details, please see:
+// https://docs.opencv.org/master/d9/dfa/classcv_1_1freetype_1_1FreeType2.html#af059d49b806b916ffdd6380b9eb2f59a
+func (f *FreeType2) LoadFontData(fontFileName string, id int) {
+	cFontFileName := C.CString(fontFileName)
+	defer C.free(unsafe.Pointer(cFontFileName))
+	C.FreeType2_LoadFontData((C.FreeType2)(f.p), cFontFileName, C.int(id))
+}
+
+// SetSplitNumber set the number of split points from bezier-curve to line.
+// If you want to draw large glyph, large is better.
+// If you want to draw small glyph, small is better.
+//
+// For further details, please see:
+// https://docs.opencv.org/master/d9/dfa/classcv_1_1freetype_1_1FreeType2.html#a572143e6c68eab181387d9f4b3366f8b
+func (f *FreeType2) SetSplitNumber(num int) {
+	C.FreeType2_SetSplitNumber((C.FreeType2)(f.p), C.int(num))
+}
+
+// PutText draws a text string.
+// It renders the specified text string in the image.
+// Symbols that cannot be rendered using the specified font are replaced by "Tofu" or non-drawn.
+//
+// For further details, please see:
+// https://docs.opencv.org/master/d9/dfa/classcv_1_1freetype_1_1FreeType2.html#aba641f774c47a70eaeb76bf7aa865915
+func (f *FreeType2) PutText(img *gocv.Mat, text string, org image.Point,
+	fontHeight int, c color.RGBA, thickness int, lineType gocv.LineType, bottomLeftOrigin bool) {
+	cText := C.CString(text)
+	defer C.free(unsafe.Pointer(cText))
+
+	sOrg := C.struct_Point{
+		x: C.int(org.X),
+		y: C.int(org.Y),
+	}
+
+	sColor := C.struct_Scalar{
+		val1: C.double(c.B),
+		val2: C.double(c.G),
+		val3: C.double(c.R),
+		val4: C.double(c.A),
+	}
+
+	C.FreeType2_PutText((C.FreeType2)(f.p), (C.Mat)(img.Ptr()), cText, sOrg, C.int(fontHeight), sColor, C.int(thickness), C.int(lineType), C.bool(bottomLeftOrigin))
+}
+
+// GetTextSize calculates the width and height of a text string.
+// The function getTextSize calculates and returns the approximate size of a box that contains the specified text.
+// That is, the following code renders some text, the tight box surrounding it, and the baseline.
+//
+// For further details, please see:
+// https://docs.opencv.org/master/d9/dfa/classcv_1_1freetype_1_1FreeType2.html#af135a132505125bdea74b378dda3bb5d
+func (f *FreeType2) GetTextSize(text string, fontHeight int, thickness int) (image.Point, int) {
+	cText := C.CString(text)
+	defer C.free(unsafe.Pointer(cText))
+	cBaseLine := C.int(0)
+
+	sz := C.FreeType2_GetTextSize((C.FreeType2)(f.p), cText, C.int(fontHeight), C.int(thickness), &cBaseLine)
+	return image.Point{
+		X: int(sz.width),
+		Y: int(sz.height),
+	}, int(cBaseLine)
+}

contrib/freetype.h

@@ -0,0 +1,33 @@
+#ifndef _OPENCV3_FREETYPE2_H_
+#define _OPENCV3_FREETYPE2_H_
+
+#ifdef __cplusplus
+#include <opencv2/opencv.hpp>
+#include <opencv2/freetype.hpp>
+extern "C" {
+#endif
+
+#include "../core.h"
+
+#ifdef __cplusplus
+typedef cv::Ptr<cv::freetype::FreeType2>* FreeType2;
+#else
+typedef void* FreeType2;
+#endif
+
+FreeType2 FreeType2_CreateFreeType2();
+void FreeType2_Close(FreeType2 f);
+void FreeType2_LoadFontData(FreeType2 f, const char* fontFileName, int id);
+void FreeType2_SetSplitNumber(FreeType2 f, int num);
+void FreeType2_PutText(FreeType2 f, Mat img, const char* text, Point org,
+        int fontHeight, Scalar color,
+        int thickness, int line_type, bool bottomLeftOrigin
+    );
+Size FreeType2_GetTextSize(FreeType2 f, const char* text,
+                                int fontHeight, int thickness, int* baseLine);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //_OPENCV3_FREETYPE2_H_