+(defun tool-bar--image-expression (icon)
+ "Return an expression that evaluates to an image spec for ICON."
+ (let* ((fg (face-attribute 'tool-bar :foreground))
+ (bg (face-attribute 'tool-bar :background))
+ (colors (nconc (if (eq fg 'unspecified) nil (list :foreground fg))
+ (if (eq bg 'unspecified) nil (list :background bg))))
+ (xpm-spec (list :type 'xpm :file (concat icon ".xpm")))
+ (xpm-lo-spec (list :type 'xpm :file
+ (concat "low-color/" icon ".xpm")))
+ (pbm-spec (append (list :type 'pbm :file
+ (concat icon ".pbm")) colors))
+ (xbm-spec (append (list :type 'xbm :file
+ (concat icon ".xbm")) colors)))
+ `(find-image (cond ((not (display-color-p))
+ ',(list pbm-spec xbm-spec xpm-lo-spec xpm-spec))
+ ((< (display-color-cells) 256)
+ ',(list xpm-lo-spec xpm-spec pbm-spec xbm-spec))
+ (t
+ ',(list xpm-spec pbm-spec xbm-spec))))))
+