From 5c9ae058bfd10eb053fc2368428a07109b59583a Mon Sep 17 00:00:00 2001
From: Michael Grant <mgrant@grant.org>
Date: Sat, 8 Aug 2026 10:21:30 +0100
Subject: [PATCH] Expose image backend flags

---
 image.c    | 17 +++--------------
 tmux.h     |  6 ++++--
 tty-draw.c |  3 ++-
 tty.c      |  2 +-
 4 files changed, 10 insertions(+), 18 deletions(-)

diff --git a/image.c b/image.c
index 9072b2b50..cccb4635f 100644
--- a/image.c
+++ b/image.c
@@ -87,9 +87,6 @@ static u_int		image_next_id;
 static u_short		image_next_grid_id;
 static struct image	*image_grid_ids[USHRT_MAX + 1];
 
-#define IMAGE_BACKEND_GRAPHICAL 0x1
-#define IMAGE_BACKEND_SCROLLS   0x2
-
 struct image_backend {
 	const char	*name;
 	int		 flags;
@@ -151,20 +148,12 @@ image_redraw_start(struct tty *tty, u_int x, u_int y, u_int width,
 		kitty_redraw_start(tty, x, y, width, height);
 }
 
-/* Return if a terminal can draw graphical images. */
+/* Return the flags for a terminal's image backend. */
 int
-image_tty_is_graphical(struct tty *tty)
+image_backend_flags(struct tty *tty)
 {
 	image_tty_update(tty);
-	return (!!(tty->image_backend->flags & IMAGE_BACKEND_GRAPHICAL));
-}
-
-/* Return if image output advances the terminal screen. */
-int
-image_tty_scrolls(struct tty *tty)
-{
-	image_tty_update(tty);
-	return (!!(tty->image_backend->flags & IMAGE_BACKEND_SCROLLS));
+	return (tty->image_backend->flags);
 }
 
 /* Discard image backend state after a terminal geometry change. */
diff --git a/tmux.h b/tmux.h
index 0a514b8d9..ffc4aecb3 100644
--- a/tmux.h
+++ b/tmux.h
@@ -4235,6 +4235,9 @@ char		*regsub(const char *, const char *, const char *, int);
 
 #ifdef ENABLE_IMAGES
 /* image.c */
+#define IMAGE_BACKEND_GRAPHICAL 0x1
+#define IMAGE_BACKEND_SCROLLS   0x2
+
 struct image	*image_create(u_int, u_int, u_int, u_int, u_int, u_int,
 		     u_char *);
 struct image	*image_create_view(struct image *, u_int, u_int, u_int,
@@ -4267,8 +4270,7 @@ void		 image_redraw_area(struct screen_write_ctx *, u_int, u_int,
 void		 image_redraw_all(struct screen_write_ctx *);
 void		 image_redraw_scroll(struct screen_write_ctx *, u_int);
 void		 image_redraw_start(struct tty *, u_int, u_int, u_int, u_int);
-int		 image_tty_is_graphical(struct tty *);
-int		 image_tty_scrolls(struct tty *);
+int		 image_backend_flags(struct tty *);
 void		 image_tty_update(struct tty *);
 void		 image_tty_geometry_changed(struct tty *);
 void		 image_tty_free(struct tty *, int);
diff --git a/tty-draw.c b/tty-draw.c
index ff3f6148c..d06def59b 100644
--- a/tty-draw.c
+++ b/tty-draw.c
@@ -264,7 +264,8 @@ tty_draw_line(struct tty *tty, struct screen *s, u_int px, u_int py, u_int nx,
 				 */
 				if (gc.flags & GRID_FLAG_IMAGE) {
 					im = image_find(gc.image_id);
-					if (image_tty_is_graphical(tty)) {
+					if (image_backend_flags(tty) &
+					    IMAGE_BACKEND_GRAPHICAL) {
 						memcpy(&image_gc, &gc,
 						    sizeof image_gc);
 						image_gc.flags &= ~(GRID_FLAG_IMAGE|
diff --git a/tty.c b/tty.c
index d4bbd7d47..4fd180a17 100644
--- a/tty.c
+++ b/tty.c
@@ -2158,7 +2158,7 @@ tty_cell(struct tty *tty, const struct grid_cell *gc,
 	 * selection; the unchanged image would then need to be drawn again.
 	 */
 	if (gc->flags & GRID_FLAG_IMAGE) {
-		if (image_tty_is_graphical(tty))
+		if (image_backend_flags(tty) & IMAGE_BACKEND_GRAPHICAL)
 			return;
 		im = image_find(gc->image_id);
 		image_get_fallback_cell(tty, im, gc->image_x, gc->image_y, gc,