opencv旋转c++

Question

这是我的代码，缩放用了opencv自带的resize函数，如何把risize改成c++写

Answer 1

D:\opencv\modules\imgproc\src\resize.cpp
    4044: void cv::resize( InputArray _src, OutputArray _dst, Size dsize,
    4045:                  double inv_scale_x, double inv_scale_y, int interpolation )
    4046: {
    4047:     CV_INSTRUMENT_REGION();
    4048: 
    4049:     Size ssize = _src.size();
    4050: 
    4051:     CV_Assert( !ssize.empty() );
    4052:     if( dsize.empty() )
    4053:     {
    4054:         CV_Assert(inv_scale_x > 0); CV_Assert(inv_scale_y > 0);
    4055:         dsize = Size(saturate_cast<int>(ssize.width*inv_scale_x),
    4056:                      saturate_cast<int>(ssize.height*inv_scale_y));
    4057:         CV_Assert( !dsize.empty() );
    4058:     }
    4059:     else
    4060:     {
    4061:         inv_scale_x = (double)dsize.width/ssize.width;
    4062:         inv_scale_y = (double)dsize.height/ssize.height;
    4063:         CV_Assert(inv_scale_x > 0); CV_Assert(inv_scale_y > 0);
    4064:     }
    4065: 
    4066:     if (interpolation == INTER_LINEAR_EXACT && (_src.depth() == CV_32F || _src.depth() == CV_64F))
    4067:         interpolation = INTER_LINEAR; // If depth isn't supported fallback to generic resize
    4068: 
    4069:     CV_OCL_RUN(_src.dims() <= 2 && _dst.isUMat() && _src.cols() > 10 && _src.rows() > 10,
    4070:                ocl_resize(_src, _dst, dsize, inv_scale_x, inv_scale_y, interpolation))
    4071: 
    4072:     // Fake reference to source. Resolves issue 13577 in case of src == dst.
    4073:     UMat srcUMat;
    4074:     if (_src.isUMat())
    4075:         srcUMat = _src.getUMat();
    4076: 
    4077:     Mat src = _src.getMat();
    4078:     _dst.create(dsize, src.type());
    4079:     Mat dst = _dst.getMat();
    4080: 
    4081:     if (dsize == ssize)
    4082:     {
    4083:         // Source and destination are of same size. Use simple copy.
    4084:         src.copyTo(dst);
    4085:         return;
    4086:     }
    4087: 
    4088:     hal::resize(src.type(), src.data, src.step, src.cols, src.rows, dst.data, dst.step, dst.cols, dst.rows, inv_scale_x, inv_scale_y, interpolation);
    4089: }