Don't include the cuda.hpp header when CUDA is not enabled

Author: twistedfall

build.rs

@@ -139,7 +139,7 @@ static SUPPORTED_MODULES: [SupportedModule; 73] = [
 	SupportedModule::XStereo,
 ];
 
-static SUPPORTED_INHERENT_FEATURES: [&str; 2] = ["hfloat", "opencl"];
+static SUPPORTED_INHERENT_FEATURES: [&str; 3] = ["hfloat", "opencl", "cuda"];
 
 /// The contents of these vars will be present in the debug log, but will not cause the source rebuild
 static DEBUG_ENV_VARS: [&str; 1] = ["PATH"];

src/manual/core.rs

@@ -20,6 +20,7 @@ pub use vector::*;
 mod affine3;
 mod data_type;
 mod directx;
+#[cfg(ocvrs_has_inherent_feature_cuda)]
 mod gpumat;
 mod inplace;
 mod input_output_array;

src_cpp/core.hpp

@@ -9,7 +9,9 @@
 	#include <opencv2/core/va_intel.hpp>
 	#include <opencv2/core/directx.hpp>
 #endif
-#include <opencv2/core/cuda.hpp>
+#ifdef HAVE_CUDA
+	#include <opencv2/core/cuda.hpp>
+#endif
 #if (CV_VERSION_MAJOR == 3 && CV_VERSION_MINOR == 4 && CV_VERSION_REVISION >= 4) /* 3.4.4+ */ \
 	|| (CV_VERSION_MAJOR == 4) /* 4.0+ */ \
 	|| (CV_VERSION_MAJOR == 5) /* 5.0+ */

src_cpp/photo.hpp

@@ -1,3 +1,5 @@
 #include "ocvrs_common.hpp"
 #include <opencv2/photo.hpp>
-#include <opencv2/photo/cuda.hpp>
+#ifdef HAVE_CUDA
+	#include <opencv2/photo/cuda.hpp>
+#endif

src_cpp/stitching.hpp

@@ -0,0 +1,24 @@
+#include "ocvrs_common.hpp"
+
+#ifndef HAVE_CUDA
+	// <opencv2/stitching.hpp> unconditionally includes a bunch of CUDA stuff without a proper way to disable it. That creates an
+	// issue as we don't generate GpuMat when HAVE_CUDA is not defined. A workaround is a couple of hacks that prevent the forced
+	// inclusion of <opencv2/core/cuda.hpp> and generation of functions that have GpuMat arguments.
+
+	// prevent forced inclusion of the <opencv2/core/cuda.hpp> header
+	#define OPENCV_CORE_CUDA_HPP
+
+	// generate a minimal stub for GpuMat so that C++ code compiles, but because of the missing export macro the bindings for the
+	// functions using this type will not be generated
+	namespace cv {
+		namespace cuda {
+			class GpuMat {
+				public:
+				void upload(InputArray arr);
+				void download(OutputArray dst) const;
+			};
+		}
+	}
+#endif
+
+#include <opencv2/stitching.hpp>

src_cpp/xfeatures2d.hpp

@@ -1,3 +1,5 @@
 #include "ocvrs_common.hpp"
 #include <opencv2/xfeatures2d.hpp>
-#include <opencv2/xfeatures2d/cuda.hpp>
+#ifdef HAVE_CUDA
+	#include <opencv2/xfeatures2d/cuda.hpp>
+#endif