highgui: allow wrapping cv::addText

also correctly forward spacing parameter in fontQt

modules/highgui/include/opencv2/highgui.hpp

@@ -670,6 +670,23 @@ The function addText draws *text* on the image *img* using a specific font *font
  */
 CV_EXPORTS void addText( const Mat& img, const String& text, Point org, const QtFont& font);
 
+/** @brief Draws a text on the image.
+
+@param img 8-bit 3-channel image where the text should be drawn.
+@param text Text to write on an image.
+@param org Point(x,y) where the text should start on an image.
+@param nameFont Name of the font. The name should match the name of a system font (such as
+*Times*). If the font is not found, a default one is used.
+@param pointSize Size of the font. If not specified, equal zero or negative, the point size of the
+font is set to a system-dependent default value. Generally, this is 12 points.
+@param color Color of the font in BGRA where A = 255 is fully transparent.
+@param weight Font weight. Available operation flags are : cv::QtFontWeights You can also specify a positive integer for better control.
+@param style Font style. Available operation flags are : cv::QtFontStyles
+@param spacing Spacing between characters. It can be negative or positive.
+ */
+CV_EXPORTS_W void addText(const Mat& img, const String& text, Point org, const String& nameFont, int pointSize = -1, Scalar color = Scalar::all(0),
+        int weight = QT_FONT_NORMAL, int style = QT_STYLE_NORMAL, int spacing = 0);
+
 /** @brief Displays a text on a window image as an overlay for a specified duration.
 
 The function displayOverlay displays useful information/tips on top of the window for a certain

modules/highgui/src/window.cpp

@@ -391,9 +391,9 @@ CV_IMPL void cvUpdateWindow(const char*)
 
 #if defined (HAVE_QT)
 
-cv::QtFont cv::fontQt(const String& nameFont, int pointSize, Scalar color, int weight,  int style, int /*spacing*/)
+cv::QtFont cv::fontQt(const String& nameFont, int pointSize, Scalar color, int weight, int style, int spacing)
 {
-    CvFont f = cvFontQt(nameFont.c_str(), pointSize,color,weight, style);
+    CvFont f = cvFontQt(nameFont.c_str(), pointSize,color,weight, style, spacing);
     void* pf = &f; // to suppress strict-aliasing
     return *(cv::QtFont*)pf;
 }
@@ -404,6 +404,14 @@ void cv::addText( const Mat& img, const String& text, Point org, const QtFont& f
     cvAddText( &_img, text.c_str(), org, (CvFont*)&font);
 }
 
+void cv::addText( const Mat& img, const String& text, Point org, const String& nameFont,
+        int pointSize, Scalar color, int weight, int style, int spacing)
+{
+    CvFont f = cvFontQt(nameFont.c_str(), pointSize,color,weight, style, spacing);
+    CvMat _img = img;
+    cvAddText( &_img, text.c_str(), org, &f);
+}
+
 void cv::displayStatusBar(const String& name,  const String& text, int delayms)
 {
     cvDisplayStatusBar(name.c_str(),text.c_str(), delayms);
@@ -441,51 +449,58 @@ int cv::createButton(const String& button_name, ButtonCallback on_change, void*
 
 #else
 
+static const char* NO_QT_ERR_MSG = "The library is compiled without QT support";
+
 cv::QtFont cv::fontQt(const String&, int, Scalar, int,  int, int)
 {
-    CV_Error(CV_StsNotImplemented, "The library is compiled without QT support");
+    CV_Error(CV_StsNotImplemented, NO_QT_ERR_MSG);
     return QtFont();
 }
 
 void cv::addText( const Mat&, const String&, Point, const QtFont&)
 {
-    CV_Error(CV_StsNotImplemented, "The library is compiled without QT support");
+    CV_Error(CV_StsNotImplemented, NO_QT_ERR_MSG);
+}
+
+void cv::addText(const Mat&, const String&, Point, const String&, int, Scalar, int, int, int)
+{
+    CV_Error(CV_StsNotImplemented, NO_QT_ERR_MSG);
 }
 
 void cv::displayStatusBar(const String&,  const String&, int)
 {
-    CV_Error(CV_StsNotImplemented, "The library is compiled without QT support");
+    CV_Error(CV_StsNotImplemented, NO_QT_ERR_MSG);
 }
 
 void cv::displayOverlay(const String&,  const String&, int )
 {
-    CV_Error(CV_StsNotImplemented, "The library is compiled without QT support");
+    CV_Error(CV_StsNotImplemented, NO_QT_ERR_MSG);
 }
 
 int cv::startLoop(int (*)(int argc, char *argv[]), int , char**)
 {
-    CV_Error(CV_StsNotImplemented, "The library is compiled without QT support");
+    CV_Error(CV_StsNotImplemented, NO_QT_ERR_MSG);
     return 0;
 }
 
 void cv::stopLoop()
 {
-    CV_Error(CV_StsNotImplemented, "The library is compiled without QT support");
+    CV_Error(CV_StsNotImplemented, NO_QT_ERR_MSG);
 }
 
 void cv::saveWindowParameters(const String&)
 {
-    CV_Error(CV_StsNotImplemented, "The library is compiled without QT support");
+    CV_Error(CV_StsNotImplemented, NO_QT_ERR_MSG);
 }
 
 void cv::loadWindowParameters(const String&)
 {
-    CV_Error(CV_StsNotImplemented, "The library is compiled without QT support");
+    CV_Error(CV_StsNotImplemented, NO_QT_ERR_MSG);
 }
 
 int cv::createButton(const String&, ButtonCallback, void*, int , bool )
 {
-    CV_Error(CV_StsNotImplemented, "The library is compiled without QT support");
+    CV_Error(CV_StsNotImplemented, NO_QT_ERR_MSG);
     return 0;
 }