Downscale image to max OpenGL texture

rawimage.cpp

@@ -410,3 +410,13 @@ void RawImage::scaleToUnit()
         }
     }
 }
+
+void RawImage::downscaleTo(uint32_t size)
+{
+    if(size < width() || size < height())
+    {
+        double s = (double)size / std::max(width(), height());
+        cv::Size dsize(std::floor(width() * s), std::floor(height() * s));
+        cv::resize(m_img, m_img, dsize, 0, 0, cv::INTER_AREA);
+    }
+}