[image] Add image_pixbuf() to create pixel buffer from image

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/core/image.c

@@ -456,3 +456,29 @@ int image_set_trust ( int require_trusted, int permanent ) {
 
 	return 0;
 }
+
+/**
+ * Create pixel buffer from image
+ *
+ * @v image		Image
+ * @v pixbuf		Pixel buffer to fill in
+ * @ret rc		Return status code
+ */
+int image_pixbuf ( struct image *image, struct pixel_buffer **pixbuf ) {
+	int rc;
+
+	/* Check that this image can be used to create a pixel buffer */
+	if ( ( rc = image_probe ( image ) ) != 0 )
+		return rc;
+	if ( ! image->type->pixbuf )
+		return -ENOTSUP;
+
+	/* Try creating pixel buffer */
+	if ( ( rc = image->type->pixbuf ( image, pixbuf ) ) != 0 ) {
+		DBGC ( image, "IMAGE %s could not create pixel buffer: %s\n",
+		       image->name, strerror ( rc ) );
+		return rc;
+	}
+
+	return 0;
+}

src/include/ipxe/image.h

@@ -16,6 +16,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <ipxe/refcnt.h>
 
 struct uri;
+struct pixel_buffer;
 struct image_type;
 
 /** An executable image */
@@ -74,9 +75,10 @@ struct image {
 struct image_type {
 	/** Name of this image type */
 	char *name;
-	/** Probe image
+	/**
+	 * Probe image
 	 *
-	 * @v image		Executable image
+	 * @v image		Image
 	 * @ret rc		Return status code
 	 *
 	 * Return success if the image is of this image type.
@@ -85,10 +87,18 @@ struct image_type {
 	/**
 	 * Execute image
 	 *
-	 * @v image		Executable image
+	 * @v image		Image
 	 * @ret rc		Return status code
 	 */
 	int ( * exec ) ( struct image *image );
+	/**
+	 * Create pixel buffer from image
+	 *
+	 * @v image		Image
+	 * @v pixbuf		Pixel buffer to fill in
+	 * @ret rc		Return status code
+	 */
+	int ( * pixbuf ) ( struct image *image, struct pixel_buffer **pixbuf );
 };
 
 /**
@@ -159,6 +169,7 @@ extern int image_replace ( struct image *replacement );
 extern int image_select ( struct image *image );
 extern struct image * image_find_selected ( void );
 extern int image_set_trust ( int require_trusted, int permanent );
+extern int image_pixbuf ( struct image *image, struct pixel_buffer **pixbuf );
 
 /**
  * Increment reference count on an image