Image decoders not setting image type correctly.

src/gdisp/image_bmp.c

@@ -407,6 +407,7 @@ gdispImageError gdispImageOpen_BMP(gdispImage *img) {
 	}
 #endif
 
+	img->type = GDISP_IMAGE_TYPE_BMP;
 	return GDISP_IMAGE_ERR_OK;
 
 baddatacleanup:

src/gdisp/image_gif.c

@@ -609,6 +609,7 @@ gdispImageError gdispImageOpen_GIF(gdispImage *img) {
 	// Read the first frame descriptor
 	switch(initFrame(img)) {
 	case GDISP_IMAGE_ERR_OK:					// Everything OK
+		img->type = GDISP_IMAGE_TYPE_GIF;
 		return GDISP_IMAGE_ERR_OK;
 	case GDISP_IMAGE_ERR_UNSUPPORTED:			// Unsupported
 		gdispImageClose_GIF(img);					// Clean up the private data area

src/gdisp/image_native.c

@@ -56,6 +56,7 @@ gdispImageError gdispImageOpen_NATIVE(gdispImage *img) {
 		return GDISP_IMAGE_ERR_NOMEMORY;
 	img->priv->frame0cache = 0;
 
+	img->type = GDISP_IMAGE_TYPE_NATIVE;
 	return GDISP_IMAGE_ERR_OK;
 }