video: Provide a way to clear part of the console
This is useful when the background colour must be written before text
is updated, to avoid strange display artifacts.
Add a function for this, using the existing code from the truetype
console.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/video.h b/include/video.h
index 03434a8..6dc42d4 100644
--- a/include/video.h
+++ b/include/video.h
@@ -205,6 +205,22 @@
int video_fill(struct udevice *dev, u32 colour);
/**
+ * video_fill_part() - Erase a region
+ *
+ * Erase a rectangle of the display within the given bounds.
+ *
+ * @dev: Device to update
+ * @xstart: X start position in pixels from the left
+ * @ystart: Y start position in pixels from the top
+ * @xend: X end position in pixels from the left
+ * @yend: Y end position in pixels from the top
+ * @colour: Value to write
+ * Return: 0 if OK, -ENOSYS if the display depth is not supported
+ */
+int video_fill_part(struct udevice *dev, int xstart, int ystart, int xend,
+ int yend, u32 colour);
+
+/**
* video_sync() - Sync a device's frame buffer with its hardware
*
* @vid: Device to sync