+ * @brief Upload a resource image to the atlas.
+ *
+ * @note To make the atlasing efficient, a valid size should be provided.
+ * If size is not provided, then the image file will be opened to read the actual size for loading.
+ * Do not set a size that is bigger than the actual image size, as the up-scaling is not available,
+ * the content of the area not covered by actual image is undefined, it will not be cleared.
+ *
+ * SamplingMode::BOX_THEN_LINEAR is used to sampling pixels from the input image while fitting it to desired size.
+ *
+ * @param [out] textureRect The texture area of the resource image in the atlas.
+ * @param [in] url The URL of the resource image file to use.
+ * @param [in] size The width and height to fit the loaded image to.
+ * @param [in] fittingMode The method used to fit the shape of the image before loading to the shape defined by the size parameter.
+ * @param [in] orientationCorrection Reorient the image to respect any orientation metadata in its header.
+ * @param[in] atlasUploadObserver The observer to observe the upload state inside the ImageAtlas.
+ * @return True if there is enough space to fit this image in,false otherwise.
+ * @note The valid callback function here is required to have the signature of void( void ).
+ */
+ bool Upload( Vector4& textureRect,
+ const std::string& url,
+ ImageDimensions size,
+ FittingMode::Type fittingMode,
+ bool orientationCorrection,
+ AtlasUploadObserver* atlasUploadObserver );
+
+ /**