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Merge pull request #893 from Kumataro:freetype2
* Support freetype2 * Before call pkg_search_module() check it is available. * If using libraries are unavailable, this module is shown in unavailable list. * using ocv_define_modules() insted of target_link_libraries(). * Fix inner indentation in C++ namespaces * Remove mImg from freetype2 and Create UserData class to refer in path drawing callbacks. * to split interface and implementation details. ( and to avoid 3rd headers in public headers) * PKG_CONFIG_FOUND is used instead of COMMAND okg_search_modules * Update Document using Doxygen * Add ocv_module_include_directories() * Do no put pixels over image boundaries. * Fix SIGSEGV (only valgrind) and missing text in top border line * Fix trailing whitespace. * Use Header File Macros * Fix CMP0023 warning in cmake * std::string to cv::String * Fix trailing whitespace * Change splitnumber from unsigned int to int to support python * ocv_include_directories() should be define before ocv_define_module() * Fix boundary problem in putTextBitmapBlend() * Fix to draw an outline glyph which are on the boundary of image. * Remove precomp.cpp * Fix CMakeLists.txt to right order. * Remove prototype definition of removed function. * Add CV_Assert() where FreeType and Harfbuzz are called * Add CV_Assert() to check InputOutputArray and line_type
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| set(the_description "FreeType module. It enables to draw strings with outlines and mono-bitmaps/gray-bitmaps.") | ||
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| if(PKG_CONFIG_FOUND) | ||
| pkg_search_module(FREETYPE freetype2) | ||
| pkg_search_module(HARFBUZZ harfbuzz) | ||
| endif() | ||
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| if(NOT FREETYPE_FOUND) | ||
| message(STATUS "freetype2: NO") | ||
| else() | ||
| message(STATUS "freetype2: YES") | ||
| endif() | ||
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| if(NOT HARFBUZZ_FOUND) | ||
| message(STATUS "harfbuzz: NO") | ||
| else() | ||
| message(STATUS "harfbuzz: YES") | ||
| endif() | ||
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| if( FREETYPE_FOUND AND HARFBUZZ_FOUND ) | ||
| ocv_define_module(freetype opencv_core opencv_imgproc PRIVATE_REQUIRED ${freetype2_LIBRARIES} ${harfbuzz_LIBRARIES} WRAP python) | ||
| ocv_include_directories( ${FREETYPE_INCLUDE_DIRS} ${HARFBUZZ_INCLUDE_DIRS} ) | ||
| else() | ||
| ocv_module_disable(freetype) | ||
| endif() |
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| @@ -0,0 +1,34 @@ | ||
| FreeType Module | ||
| =========== | ||
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| This FreeType module allows you to draw strings with outlines and bitmaps. | ||
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| Installation | ||
| ----------- | ||
| harfbuzz is requested to convert UTF8 to gid(GlyphID). | ||
| freetype library is requested to rasterize given gid. | ||
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| harfbuzz https://www.freedesktop.org/wiki/Software/HarfBuzz/ | ||
| freetype https://www.freetype.org/ | ||
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| Usage | ||
| ----------- | ||
| cv::freetype::FreeType2 ft2; | ||
| ft2.loadFontData("your-font.ttf", 0); | ||
| ft2.setSplitNumber( 4 ); // Bezier-line is splited by 4 segment. | ||
| ft2.putText(src, .... ) | ||
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| 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. | ||
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| Future work | ||
| ------------ | ||
| - test | ||
| -- CJK and ... | ||
| - RTL,LTR,TTB,BTT... |
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| /*M/////////////////////////////////////////////////////////////////////////////////////// | ||
| // | ||
| // IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. | ||
| // | ||
| // By downloading, copying, installing or using the software you agree to this license. | ||
| // If you do not agree to this license, do not download, install, | ||
| // copy or use the software. | ||
| // | ||
| // | ||
| // License Agreement | ||
| // For Open Source Computer Vision Library | ||
| // | ||
| // Copyright (C) 2000-2008, Intel Corporation, all rights reserved. | ||
| // Copyright (C) 2009-2012, Willow Garage Inc., all rights reserved. | ||
| // Third party copyrights are property of their respective owners. | ||
| // | ||
| // Redistribution and use in source and binary forms, with or without modification, | ||
| // are permitted provided that the following conditions are met: | ||
| // | ||
| // * Redistribution's of source code must retain the above copyright notice, | ||
| // this list of conditions and the following disclaimer. | ||
| // | ||
| // * Redistribution's in binary form must reproduce the above copyright notice, | ||
| // this list of conditions and the following disclaimer in the documentation | ||
| // and/or other materials provided with the distribution. | ||
| // | ||
| // * The name of the copyright holders may not be used to endorse or promote products | ||
| // derived from this software without specific prior written permission. | ||
| // | ||
| // This software is provided by the copyright holders and contributors "as is" and | ||
| // any express or implied warranties, including, but not limited to, the implied | ||
| // warranties of merchantability and fitness for a particular purpose are disclaimed. | ||
| // In no event shall the Intel Corporation or contributors be liable for any direct, | ||
| // indirect, incidental, special, exemplary, or consequential damages | ||
| // (including, but not limited to, procurement of substitute goods or services; | ||
| // loss of use, data, or profits; or business interruption) however caused | ||
| // and on any theory of liability, whether in contract, strict liability, | ||
| // or tort (including negligence or otherwise) arising in any way out of | ||
| // the use of this software, even if advised of the possibility of such damage. | ||
| // | ||
| //M*/ | ||
| //################################################################################ | ||
| // | ||
| // Created by Kumataro | ||
| // | ||
| //################################################################################ | ||
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| #ifndef _OPENCV_FREETYPE_H_ | ||
| #define _OPENCV_FREETYPE_H_ | ||
| #ifdef __cplusplus | ||
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| #include <opencv2/core.hpp> | ||
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| /** | ||
| @defgroup freetype Drawing UTF-8 strings with freetype/harfbuzz | ||
| This modules is to draw UTF-8 strings with freetype/harfbuzz. | ||
| 1. Install freetype2 and harfbuzz in your system. | ||
| 2. Create FreeType2 instance with createFreeType2() function. | ||
| 3. Load font file with loadFontData() function. | ||
| 4. Draw text with putText() function. | ||
| - If thickness parameter is negative, drawing glyph is filled. | ||
| - If thickness parameter is positive, drawing glyph is outlined with thickness. | ||
| - If line_type parameter is 16(or CV_AA), drawing glyph is smooth. | ||
| */ | ||
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| namespace cv { | ||
| namespace freetype { | ||
| //! @addtogroup freetype | ||
| //! @{ | ||
| class CV_EXPORTS_W FreeType2 : public Algorithm | ||
| { | ||
| public: | ||
| /** @brief Load font data. | ||
| The function loadFontData loads font data. | ||
| @param fontFileName FontFile Name | ||
| @param id face_index to select a font faces in a single file. | ||
| */ | ||
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| CV_WRAP virtual void loadFontData(String fontFileName, int id) = 0; | ||
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| /** @brief Set Split Number from Bezier-curve to line | ||
| The function 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. | ||
| @param num number of split points from bezier-curve to line | ||
| */ | ||
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| CV_WRAP virtual void setSplitNumber( int num ) = 0; | ||
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| /** @brief Draws a text string. | ||
| The function putText renders the specified text string in the image. Symbols that cannot be rendered using the specified font are replaced by "Tofu" or non-drawn. | ||
| @param img Image. | ||
| @param text Text string to be drawn. | ||
| @param org Bottom-left/Top-left corner of the text string in the image. | ||
| @param fontHeight Drawing font size by pixel unit. | ||
| @param color Text color. | ||
| @param thickness Thickness of the lines used to draw a text when negative, the glyph is filled. Otherwise, the glyph is drawn with this thickness. | ||
| @param line_type Line type. See the line for details. | ||
| @param bottomLeftOrigin When true, the image data origin is at the bottom-left corner. Otherwise, it is at the top-left corner. | ||
| */ | ||
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| CV_WRAP virtual void putText( | ||
| InputOutputArray img, const String& text, Point org, | ||
| int fontHeight, Scalar color, | ||
| int thickness, int line_type, bool bottomLeftOrigin | ||
| ) = 0; | ||
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| }; | ||
| /** @brief Create FreeType2 Instance | ||
| The function createFreeType2 create instance to draw UTF-8 strings. | ||
| */ | ||
| CV_EXPORTS_W Ptr<FreeType2> createFreeType2(); | ||
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| //! @] | ||
| } } // namespace freetype | ||
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| #endif | ||
| #endif |
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