build: fix warnings

modules/core/src/cuda_host_mem.cpp

@@ -206,7 +206,7 @@ void cv::cuda::HostMem::create(int rows_, int cols_, int type_)
         cols = cols_;
         step = elemSize() * cols;
         int sz[] = { rows, cols };
-        size_t steps[] = { step, CV_ELEM_SIZE(type_) };
+        size_t steps[] = { step, (size_t)CV_ELEM_SIZE(type_) };
         flags = updateContinuityFlag(flags, 2, sz, steps);
 
         if (alloc_type == SHARED)

modules/core/src/opengl.cpp

@@ -1726,7 +1726,7 @@ void convertToGLTexture2D(InputArray src, Texture2D& texture)
         CV_Error(cv::Error::OpenCLApiCallError, "OpenCL: clEnqueueAcquireGLObjects failed");
     size_t offset = 0; // TODO
     size_t dst_origin[3] = {0, 0, 0};
-    size_t region[3] = {u.cols, u.rows, 1};
+    size_t region[3] = { (size_t)u.cols, (size_t)u.rows, 1};
     status = clEnqueueCopyBufferToImage(q, clBuffer, clImage, offset, dst_origin, region, 0, NULL, NULL);
     if (status != CL_SUCCESS)
         CV_Error(cv::Error::OpenCLApiCallError, "OpenCL: clEnqueueCopyBufferToImage failed");
@@ -1786,7 +1786,7 @@ void convertFromGLTexture2D(const Texture2D& texture, OutputArray dst)
         CV_Error(cv::Error::OpenCLApiCallError, "OpenCL: clEnqueueAcquireGLObjects failed");
     size_t offset = 0; // TODO
     size_t src_origin[3] = {0, 0, 0};
-    size_t region[3] = {u.cols, u.rows, 1};
+    size_t region[3] = { (size_t)u.cols, (size_t)u.rows, 1};
     status = clEnqueueCopyImageToBuffer(q, clImage, clBuffer, src_origin, region, offset, 0, NULL, NULL);
     if (status != CL_SUCCESS)
         CV_Error(cv::Error::OpenCLApiCallError, "OpenCL: clEnqueueCopyImageToBuffer failed");

modules/highgui/src/window_QT.cpp

@@ -103,7 +103,7 @@ CV_IMPL CvFont cvFontQt(const char* nameFont, int pointSize,CvScalar color,int w
     float       dx;//spacing letter in Qt (0 default) in pixel
     int         line_type;//<- pointSize in Qt
     */
-    CvFont f = {nameFont,color,style,NULL,NULL,NULL,0,0,0,weight,spacing,pointSize};
+    CvFont f = {nameFont,color,style,NULL,NULL,NULL,0,0,0,weight, (float)spacing, pointSize};
     return f;
 }