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// copy or use the software.
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// License Agreement
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// For Open Source Computer Vision Library
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//
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// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// Copyright (C) 2009-2012, Willow Garage Inc., all rights reserved.
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//M*/
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//################################################################################
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//
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// Created by Kumataro
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//
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//################################################################################
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#ifndef _OPENCV_FREETYPE_H_
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#define _OPENCV_FREETYPE_H_
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#ifdef __cplusplus
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#include <opencv2/core.hpp>
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/**
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@defgroup freetype Drawing UTF-8 strings with freetype/harfbuzz
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This modules is to draw UTF-8 strings with freetype/harfbuzz.
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1. Install freetype2 and harfbuzz in your system.
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2. Create FreeType2 instance with createFreeType2() function.
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3. Load font file with loadFontData() function.
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4. Draw text with putText() function.
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- If thickness parameter is negative, drawing glyph is filled.
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- If thickness parameter is positive, drawing glyph is outlined with thickness.
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- If line_type parameter is 16(or CV_AA), drawing glyph is smooth.
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*/
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namespace cv {
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namespace freetype {
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//! @addtogroup freetype
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//! @{
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class CV_EXPORTS_W FreeType2 : public Algorithm
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{
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public:
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/** @brief Load font data.
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The function loadFontData loads font data.
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@param fontFileName FontFile Name
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@param id face_index to select a font faces in a single file.
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*/
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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
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The function setSplitNumber set the number of split points from bezier-curve to line.
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If you want to draw large glyph, large is better.
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If you want to draw small glyph, small is better.
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@param num number of split points from bezier-curve to line
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*/
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CV_WRAP virtual void setSplitNumber( int num ) = 0;
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/** @brief Draws a text string.
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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.
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@param img Image.
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@param text Text string to be drawn.
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@param org Bottom-left/Top-left corner of the text string in the image.
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@param fontHeight Drawing font size by pixel unit.
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@param color Text color.
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@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.
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@param line_type Line type. See the line for details.
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@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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*/
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CV_WRAP virtual void putText(
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InputOutputArray img, const String& text, Point org,
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int fontHeight, Scalar color,
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int thickness, int line_type, bool bottomLeftOrigin
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) = 0;
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/** @brief Calculates the width and height of a text string.
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The function getTextSize calculates and returns the approximate size of a box that contains the specified text.
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That is, the following code renders some text, the tight box surrounding it, and the baseline: :
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@code
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String text = "Funny text inside the box";
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int fontHeight = 60;
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int thickness = -1;
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int linestyle = 8;
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Mat img(600, 800, CV_8UC3, Scalar::all(0));
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int baseline=0;
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cv::Ptr<cv::freetype::FreeType2> ft2;
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ft2 = cv::freetype::createFreeType2();
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ft2->loadFontData( "./mplus-1p-regular.ttf", 0 );
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Size textSize = ft2->getTextSize(text,
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fontHeight,
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thickness,
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&baseline);
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if(thickness > 0){
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baseline += thickness;
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}
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// center the text
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Point textOrg((img.cols - textSize.width) / 2,
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(img.rows + textSize.height) / 2);
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// draw the box
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rectangle(img, textOrg + Point(0, baseline),
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textOrg + Point(textSize.width, -textSize.height),
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Scalar(0,255,0),1,8);
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// ... and the baseline first
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line(img, textOrg + Point(0, thickness),
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textOrg + Point(textSize.width, thickness),
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Scalar(0, 0, 255),1,8);
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// then put the text itself
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ft2->putText(img, text, textOrg, fontHeight,
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Scalar::all(255), thickness, linestyle, true );
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@endcode
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@param text Input text string.
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@param fontHeight Drawing font size by pixel unit.
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@param thickness Thickness of lines used to render the text. See putText for details.
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@param[out] baseLine y-coordinate of the baseline relative to the bottom-most text
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point.
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@return The size of a box that contains the specified text.
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@see cv::putText
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*/
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CV_WRAP virtual Size getTextSize(const String& text,
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int fontHeight, int thickness,
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CV_OUT int* baseLine) = 0;
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};
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/** @brief Create FreeType2 Instance
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The function createFreeType2 create instance to draw UTF-8 strings.
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*/
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CV_EXPORTS_W Ptr<FreeType2> createFreeType2();
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//! @}
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} } // namespace freetype
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#endif
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#endif
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