removed C API in the following modules: photo, video, imgcodecs, videoio (#13060)

* removed C API in the following modules: photo, video, imgcodecs, videoio

* trying to fix various compile errors and warnings on Windows and Linux

* continue to fix compile errors and warnings

* continue to fix compile errors, warnings, as well as the test failures

* trying to resolve compile warnings on Android

* Update cap_dc1394_v2.cpp

fix warning from the new GCC

modules/imgcodecs/include/opencv2/imgcodecs.hpp

@@ -53,6 +53,52 @@
   @}
 */
 
+/* duplicate of "ImreadModes" enumeration for better compatibility with OpenCV 3.x */
+enum
+{
+/* 8bit, color or not */
+    CV_LOAD_IMAGE_UNCHANGED  =-1,
+/* 8bit, gray */
+    CV_LOAD_IMAGE_GRAYSCALE  =0,
+/* ?, color */
+    CV_LOAD_IMAGE_COLOR      =1,
+/* any depth, ? */
+    CV_LOAD_IMAGE_ANYDEPTH   =2,
+/* ?, any color */
+    CV_LOAD_IMAGE_ANYCOLOR   =4,
+/* ?, no rotate */
+    CV_LOAD_IMAGE_IGNORE_ORIENTATION  =128
+};
+
+/* duplicate of "ImwriteFlags" enumeration for better compatibility with OpenCV 3.x */
+enum
+{
+    CV_IMWRITE_JPEG_QUALITY =1,
+    CV_IMWRITE_JPEG_PROGRESSIVE =2,
+    CV_IMWRITE_JPEG_OPTIMIZE =3,
+    CV_IMWRITE_JPEG_RST_INTERVAL =4,
+    CV_IMWRITE_JPEG_LUMA_QUALITY =5,
+    CV_IMWRITE_JPEG_CHROMA_QUALITY =6,
+    CV_IMWRITE_PNG_COMPRESSION =16,
+    CV_IMWRITE_PNG_STRATEGY =17,
+    CV_IMWRITE_PNG_BILEVEL =18,
+    CV_IMWRITE_PNG_STRATEGY_DEFAULT =0,
+    CV_IMWRITE_PNG_STRATEGY_FILTERED =1,
+    CV_IMWRITE_PNG_STRATEGY_HUFFMAN_ONLY =2,
+    CV_IMWRITE_PNG_STRATEGY_RLE =3,
+    CV_IMWRITE_PNG_STRATEGY_FIXED =4,
+    CV_IMWRITE_PXM_BINARY =32,
+    CV_IMWRITE_EXR_TYPE = 48,
+    CV_IMWRITE_WEBP_QUALITY =64,
+    CV_IMWRITE_PAM_TUPLETYPE = 128,
+    CV_IMWRITE_PAM_FORMAT_NULL = 0,
+    CV_IMWRITE_PAM_FORMAT_BLACKANDWHITE = 1,
+    CV_IMWRITE_PAM_FORMAT_GRAYSCALE = 2,
+    CV_IMWRITE_PAM_FORMAT_GRAYSCALE_ALPHA = 3,
+    CV_IMWRITE_PAM_FORMAT_RGB = 4,
+    CV_IMWRITE_PAM_FORMAT_RGB_ALPHA = 5,
+};
+
 //////////////////////////////// image codec ////////////////////////////////
 namespace cv
 {
@@ -250,6 +296,19 @@ CV_EXPORTS_W bool imencode( const String& ext, InputArray img,
                             CV_OUT std::vector<uchar>& buf,
                             const std::vector<int>& params = std::vector<int>());
 
+/** @brief Returns true if the specified image can be decoded by OpenCV
+
+@param filename File name of the image
+*/
+CV_EXPORTS_W bool haveImageReader( const String& filename );
+
+/** @brief Returns true if an image with the specified filename can be encoded by OpenCV
+
+ @param filename File name of the image
+ */
+CV_EXPORTS_W bool haveImageWriter( const String& filename );
+
+
 //! @} imgcodecs
 
 } // cv