imgcodecs: disable OpenEXR in runtime for 3rdparty source code

- builtin OpenEXR source code is outdated
- external OpenEXR distributions are allowed

modules/imgcodecs/src/grfmt_exr.cpp

@@ -44,6 +44,9 @@
 
 #ifdef HAVE_OPENEXR
 
+#include <opencv2/core/utils/configuration.private.hpp>
+#include <opencv2/core/utils/logger.hpp>
+
 #if defined _MSC_VER && _MSC_VER >= 1200
 #  pragma warning( disable: 4100 4244 4267 )
 #endif
@@ -78,6 +81,27 @@
 namespace cv
 {
 
+static bool isOpenEXREnabled()
+{
+    static const bool PARAM_ENABLE_OPENEXR = utils::getConfigurationParameterBool("OPENCV_IO_ENABLE_OPENEXR",
+#ifdef OPENCV_IMGCODECS_USE_OPENEXR
+        true
+#else
+        false
+#endif
+    );
+    return PARAM_ENABLE_OPENEXR;
+}
+static void initOpenEXR()
+{
+    if (!isOpenEXREnabled())
+    {
+        const char* message = "imgcodecs: OpenEXR codec is disabled. You can enable it via 'OPENCV_IO_ENABLE_OPENEXR' option. Refer for details and cautions here: https://github.com/opencv/opencv/issues/21326";
+        CV_LOG_WARNING(NULL, message);
+        CV_Error(Error::StsNotImplemented, message);
+    }
+}
+
 /////////////////////// ExrDecoder ///////////////////
 
 ExrDecoder::ExrDecoder()
@@ -575,6 +599,7 @@ void  ExrDecoder::RGBToGray( float *in, float *out )
 
 ImageDecoder ExrDecoder::newDecoder() const
 {
+    initOpenEXR();
     return makePtr<ExrDecoder>();
 }
 
@@ -698,6 +723,7 @@ bool  ExrEncoder::write( const Mat& img, const std::vector<int>& params )
 
 ImageEncoder ExrEncoder::newEncoder() const
 {
+    initOpenEXR();
     return makePtr<ExrEncoder>();
 }