How to Create a polygon(trapezoidal shape) for extracting ROI

[Anadelphia]

I was wondering if i could create a mask for extracting ROI from my original image, i need to create a trapezoidal shape in my mask image and bit-wise_and it with my binary original image for extracting ROI. or any suggestion for creating trapezoidal shape in my original image?

i found something like xf::Window but i'm not sure i can either use it for this purpose or not ? os: Windows / Vivado HLS 2019.1

[Anadelphia]

i found it this way

/*

• row = y = h & col = x = w
• Left line:
• Point0: (0,row) = (0,360)
• Point1:(x,y)= (4col/9,6row/10) = (284,516)
• (y-y0)=m(x-x0) -> m=(216-360)/(284-0) ->y-360=-(0.5070x)-0 -> y=-(0.5070*x)+360
• if 2y<-x+720 -> &0 else &1
• Right line:
• m=(360-216)/(640-355)= 144/285= -0.5053
• y-360=(0.5053*x)-640 -> y=0.5x+40
• if 2y<x+80 -> &0 else &1
• */

[Anadelphia]

template<int SRC_T=TYPE_BINARY, int IN_ROWS, int IN_COLS, int IN_NPC> void RoiExtraction(xf::Mat<SRC_T, IN_ROWS, IN_COLS, IN_NPC> &xfMat_In, xf::Mat<SRC_T, IN_ROWS, IN_COLS, IN_NPC> &xfMat_Out) {

    uint16_t image_width = xfMat_In.cols >> XF_BITSHIFT(IN_NPC);
    uint16_t image_height = xfMat_In.rows;
    XF_PTNAME(XF_DEPTH(SRC_T,IN_NPC))  in_pix;
    XF_PTNAME(XF_DEPTH(SRC_T,IN_NPC)) out_pix;
    uint8type data;
    int32_t x_calc_r,x_calc_l;
    uint32_t y_calc;

loop_xy_roi_in: for(uint16_t row = 0; row < image_height; row++) {

pragma HLS LOOP_TRIPCOUNT max=IN_ROWS

        for(uint16_t col = 0; col < image_width; col++)
        {

pragma HLS LOOP_TRIPCOUNT max=IN_COLS

pragma HLS PIPELINE

            if(row>216)
            {
            x_calc_l=(col*-1)+720;
            x_calc_r=col+80;
            y_calc= 2*row;

            if(y_calc>x_calc_l && y_calc>x_calc_r) out_pix = xfMat_In.read(row*image_width+col);
            else out_pix.range(7, 0) = (unsigned char)0x00;
            }
            else out_pix.range(7, 0) = (unsigned char)0x00;

            xfMat_Out.write(row*image_width+col,(out_pix));
        }
    }

}