Simple function to prevent rect from going abroad

fixBound.hpp

#include <opencv2/core.hpp>

static bool fixBound(cv::Rect &rect, const cv::Size &roi) {
    bool ok = true;
    if (rect.width <= 0) {
        ok = false;
        rect.width = roi.width;
    }
    if (rect.height <= 0) {
        ok = false;
        rect.height = roi.height;
    }
    if (rect.x < 0) rect.x = 0;
    if (rect.y < 0) rect.y = 0;
    if (rect.x >= roi.width)
        rect.x = roi.width - rect.width;
    if (rect.y >= roi.height)
        rect.y = roi.height - rect.height;
    if (rect.x + rect.width > roi.width)
        rect.width = roi.width - rect.x;
    if (rect.y + rect.height > roi.height)
        rect.height = roi.height - rect.y;
    if (rect.width > roi.width)
        rect.width = roi.width;
    if (rect.height > roi.height)
        rect.height = roi.height;
    if (rect.x < 0) rect.x = 0;
    if (rect.y < 0) rect.y = 0;
    return ok;
}