video: Add a function to draw a rectangle

Provide a way to draw an unfilled box of a certain width. This is useful
for grouping menu items together.

Add a comment showing how to see the copy-framebuffer, for testing.

Signed-off-by: Simon Glass <[email protected]>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c
index 1c372bd58b7..53641fc28b6 100644
--- a/drivers/video/video-uclass.c
+++ b/drivers/video/video-uclass.c
@@ -26,6 +26,7 @@
 #ifdef CONFIG_SANDBOX
 #include <asm/sdl.h>
 #endif
+#include "vidconsole_internal.h"
 
 /*
  * Theory of operation:
@@ -216,6 +217,40 @@ int video_fill_part(struct udevice *dev, int xstart, int ystart, int xend,
 	return 0;
 }
 
+int video_draw_box(struct udevice *dev, int x0, int y0, int x1, int y1,
+		   int width, u32 colour)
+{
+	struct video_priv *priv = dev_get_uclass_priv(dev);
+	int pbytes = VNBYTES(priv->bpix);
+	void *start, *line;
+	int pixels = x1 - x0;
+	int row;
+
+	start = priv->fb + y0 * priv->line_length;
+	start += x0 * pbytes;
+	line = start;
+	for (row = y0; row < y1; row++) {
+		void *ptr = line;
+		int i;
+
+		for (i = 0; i < width; i++)
+			fill_pixel_and_goto_next(&ptr, colour, pbytes, pbytes);
+		if (row < y0 + width || row >= y1 - width) {
+			for (i = 0; i < pixels - width * 2; i++)
+				fill_pixel_and_goto_next(&ptr, colour, pbytes,
+							 pbytes);
+		} else {
+			ptr += (pixels - width * 2) * pbytes;
+		}
+		for (i = 0; i < width; i++)
+			fill_pixel_and_goto_next(&ptr, colour, pbytes, pbytes);
+		line += priv->line_length;
+	}
+	video_damage(dev, x0, y0, x1 - x0, y1 - y0);
+
+	return 0;
+}
+
 int video_reserve_from_bloblist(struct video_handoff *ho)
 {
 	if (!ho->fb || ho->size == 0)
@@ -481,6 +516,7 @@ int video_sync(struct udevice *vid, bool force)
 		video_flush_dcache(vid, true);
 
 #if defined(CONFIG_VIDEO_SANDBOX_SDL)
+	/* to see the copy framebuffer, use priv->copy_fb */
 	sandbox_sdl_sync(priv->fb);
 #endif
 	priv->last_sync = get_timer(0);