Add gdispImageIsOpen() function.

2 files changed, 22 insertions, 1 deletions

diff --git a/include/gdisp/image.h b/include/gdisp/image.h
index 696500a6..ea8a02d4 100644
--- a/include/gdisp/image.h
+++ b/include/gdisp/image.h
@@ -185,7 +185,7 @@ extern "C" {
 	gdispImageError gdispImageOpen(gdispImage *img);
 	
 	/**
-	 * @brief	Close an image and release any dynamicly allocated working storage.
+	 * @brief	Close an image and release any dynamically allocated working storage.
 	 * 
 	 * @param[in] img   The image structure
 	 * 
@@ -196,6 +196,19 @@ extern "C" {
 	void gdispImageClose(gdispImage *img);
 
 	/**
+	 * @brief	Is an image open.
+	 * @return	TRUE if the image is currently open.
+	 *
+	 * @param[in] img   The image structure
+	 *
+	 * @note	Be careful with calling this on an uninitialized image structure as the image
+	 * 			will contain random data which may be interpreted as meaning the image
+	 * 			is open. Clearing the Image structure to 0's will guarantee the image
+	 * 			is seen as being closed.
+	 */
+	bool_t gdispImageIsOpen(gdispImage *img);
+
+	/**
 	 * @brief	Set the background color of the image.
 	 *
 	 * @param[in] img   	The image structure
diff --git a/src/gdisp/image.c b/src/gdisp/image.c
index fec05147..efeb6ad1 100644
--- a/src/gdisp/image.c
+++ b/src/gdisp/image.c
@@ -184,6 +184,14 @@ void gdispImageClose(gdispImage *img) {
 		img->fns->close(img);
 	else
 		img->io.fns->close(&img->io);
+	img->type = GDISP_IMAGE_TYPE_UNKNOWN;
+	img->flags = 0;
+	img->fns = 0;
+	img->priv = 0;
+}
+
+bool_t gdispImageIsOpen(gdispImage *img) {
+	return img->type != GDISP_IMAGE_TYPE_UNKNOWN && img->fns != 0;
 }
 
 void gdispImageSetBgColor(gdispImage *img, color_t bgcolor) {