Merge pull request #7167 from alalek:modules_deps

modules/highgui/CMakeLists.txt

 set(the_description "High-level GUI and Media I/O")
-ocv_add_module(highgui opencv_imgproc opencv_imgcodecs opencv_videoio WRAP python)
+ocv_add_module(highgui opencv_imgproc OPTIONAL opencv_imgcodecs opencv_videoio WRAP python)
 
 # ----------------------------------------------------------------------------
 #  CMake file for highgui. See root CMakeLists.txt

modules/highgui/include/opencv2/highgui.hpp

@@ -44,8 +44,12 @@
 #define __OPENCV_HIGHGUI_HPP__
 
 #include "opencv2/core.hpp"
+#ifdef HAVE_OPENCV_IMGCODECS
 #include "opencv2/imgcodecs.hpp"
+#endif
+#ifdef HAVE_OPENCV_VIDEOIO
 #include "opencv2/videoio.hpp"
+#endif
 
 /**
 @defgroup highgui High-level GUI

modules/highgui/include/opencv2/highgui/highgui_c.h

@@ -44,8 +44,12 @@
 
 #include "opencv2/core/core_c.h"
 #include "opencv2/imgproc/imgproc_c.h"
+#ifdef HAVE_OPENCV_IMGCODECS
 #include "opencv2/imgcodecs/imgcodecs_c.h"
+#endif
+#ifdef HAVE_OPENCV_VIDEOIO
 #include "opencv2/videoio/videoio_c.h"
+#endif
 
 #ifdef __cplusplus
 extern "C" {

modules/highgui/src/precomp.hpp

@@ -47,12 +47,14 @@
 #include "opencv2/core/utility.hpp"
 #include "opencv2/core/private.hpp"
 
-#include "opencv2/imgcodecs.hpp"
-
 #include "opencv2/imgproc/imgproc_c.h"
-#include "opencv2/imgcodecs/imgcodecs_c.h"
 #include "opencv2/highgui/highgui_c.h"
 
+#ifdef HAVE_OPENCV_IMGCODECS
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/imgcodecs/imgcodecs_c.h"
+#endif
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>

modules/highgui/test/test_precomp.hpp

@@ -6,16 +6,4 @@
 #  endif
 #endif
 
-#ifndef __OPENCV_TEST_PRECOMP_HPP__
-#define __OPENCV_TEST_PRECOMP_HPP__
-
-#include <iostream>
 #include "opencv2/ts.hpp"
-//#include "opencv2/imgproc.hpp"
-//#include "opencv2/imgcodecs.hpp"
-//#include "opencv2/highgui.hpp"
-//#include "opencv2/imgproc/imgproc_c.h"
-
-//#include "opencv2/core/private.hpp"
-
-#endif