overlay: introduce overlay.redraw_needed

Set on window resize, clear on draw_overlay() return.

Used in combination with sample_interval check to gate HZ redraw.

Will be used to gate redraw of process monitors heirarchy as well,
in a subsequent commit.

1 files changed, 14 insertions, 13 deletions

diff --git a/src/overlay.h b/src/overlay.h
index 94e2dca..dd60319 100644
--- a/src/overlay.h
+++ b/src/overlay.h
@@ -9,19 +9,20 @@ typedef struct _vwm_xwindow_t vwm_xwindow_t;
 
 /* everything needed by the per-window overlay's context */
 typedef struct _vwm_overlay_t {
-	Pixmap			text_pixmap;		/* pixmap for overlayed text (kept around for XDrawText usage) */
-	Picture			text_picture;		/* picture representation of text_pixmap */
-	Picture			shadow_picture;		/* text shadow layer */
-	Picture			grapha_picture;		/* graph A layer */
-	Picture			graphb_picture;		/* graph B layer */
-	Picture			tmp_picture;		/* 1 row worth of temporary picture space */
-	Picture			picture;		/* overlay picture derived from the pixmap, for render compositing */
-	int			width;			/* current width of the overlay */
-	int			height;			/* current height of the overlay */
-	int			phase;			/* current position within the (horizontally scrolling) graphs */
-	int			heirarchy_end;		/* row where the process heirarchy currently ends */
-	int			snowflakes_cnt;		/* count of snowflaked rows (reset to zero to truncate snowflakes display) */
-	int			gen_last_composed;	/* the last composed vmon generation */
+	Pixmap	text_pixmap;		/* pixmap for overlayed text (kept around for XDrawText usage) */
+	Picture	text_picture;		/* picture representation of text_pixmap */
+	Picture	shadow_picture;		/* text shadow layer */
+	Picture	grapha_picture;		/* graph A layer */
+	Picture	graphb_picture;		/* graph B layer */
+	Picture	tmp_picture;		/* 1 row worth of temporary picture space */
+	Picture	picture;		/* overlay picture derived from the pixmap, for render compositing */
+	int	width;			/* current width of the overlay */
+	int	height;			/* current height of the overlay */
+	int	phase;			/* current position within the (horizontally scrolling) graphs */
+	int	heirarchy_end;		/* row where the process heirarchy currently ends */
+	int	snowflakes_cnt;		/* count of snowflaked rows (reset to zero to truncate snowflakes display) */
+	int	gen_last_composed;	/* the last composed vmon generation */
+	int	redraw_needed;		/* if a redraw is required (like when the window is resized...) */
 } vwm_overlay_t;
 
 int vwm_overlay_xwin_composed_height(vwm_t *vwm, vwm_xwindow_t *xwin);