Move window edge functions to Elisp.

* src/window.c (Fwindow_edges, Fwindow_pixel_edges)
(Fwindow_absolute_pixel_edges, Fwindow_inside_edges)
(Fwindow_inside_pixel_edges, Fwindow_inside_absolute_pixel_edges):
Move to window.el.
(calc_absolute_offset): Remove.
* lisp/frame.el (frame-edges): New function.
* lisp/window.el (window-edges, window-pixel-edges)
(window-absolute-pixel-edges): Move here from window.c.
(window-body-edges, window-body-pixel-edges)
(window-absolute-body-pixel-edges): Move here from window.c and
rename "inside" to "body".  Keep old names as aliases.
(window-absolute-pixel-position): New function.

2 files changed, 146 insertions, 0 deletions

diff --git a/lisp/frame.el b/lisp/frame.el
index d1e7c003411..391f23922f8 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -1312,6 +1312,24 @@ live frame and defaults to the selected one."
       (setq vertical default-frame-scroll-bars))
     (cons vertical (and horizontal 'bottom))))
 
+(defun frame-edges (&optional frame type)
+  "Return coordinates of FRAME's edges.
+FRAME must be a live frame and defaults to the selected one.  The
+list returned has the form (LEFT TOP RIGHT BOTTOM) where all
+values are in pixels relative to the origin - the position (0, 0)
+- of FRAME's display.  For terminal frames all values are
+relative to LEFT and TOP which are both zero.
+
+Optional argument TYPE specifies the type of the edges.  TYPE
+`outer-edges' means to return the outer edges of FRAME.  TYPE
+`native-edges' (or nil) means to return the native edges of
+FRAME.  TYPE `inner-edges' means to return the inner edges of
+FRAME."
+  (let ((frame (window-normalize-frame frame)))
+    (if (display-graphic-p (frame-parameter nil 'display))
+        (x-frame-edges frame (or type 'native-edges))
+      (list 0 0 (frame-width frame) (frame-height frame)))))
+
 (defun frame-monitor-attributes (&optional frame)
   "Return the attributes of the physical monitor dominating FRAME.
 If FRAME is omitted or nil, describe the currently selected frame.
diff --git a/lisp/window.el b/lisp/window.el
index d9c0d0afbe1..ebe7054b090 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -3422,6 +3422,134 @@ WINDOW pixelwise."
    (- (window-min-delta window t nil nil nil nil window-resize-pixelwise))
    t nil window-resize-pixelwise))
 
+;;; Window edges
+(defun window-edges (&optional window body absolute pixelwise)
+  "Return a list of the edge distances of WINDOW.
+WINDOW must be a valid window and defaults to the selected one.
+The list returned has the form (LEFT TOP RIGHT BOTTOM).
+
+If the optional argument BODY is nil, this means to return the
+edges corresponding to the total size of WINDOW.  BODY non-nil
+means to return the edges of WINDOW's body (aka text area).  If
+BODY is non-nil, WINDOW must specify a live window.
+
+Optional argument ABSOLUTE nil means to return edges relative to
+the position of WINDOW's native frame.  ABSOLUTE non-nil means to
+return coordinates relative to the origin - the position (0, 0) -
+of FRAME's display.  On non-graphical systems this argument has
+no effect.
+
+Optional argument PIXELWISE nil means to return the coordinates
+in terms of the canonical character width and height of WINDOW's
+frame, rounded if necessary.  PIXELWISE non-nil means to return
+the coordinates in pixels where the values for RIGHT and BOTTOM
+are one more than the actual value of these edges.  Note that if
+ABSOLUTE is non-nil, PIXELWISE is implicily non-nil too."
+  (let* ((window (window-normalize-window window body))
+         (frame (window-frame window))
+         (border-width (frame-border-width frame))
+         (char-width (frame-char-width frame))
+         (char-height (frame-char-height frame))
+         (left (if pixelwise
+                   (+ (window-pixel-left window) border-width)
+                 (+ (window-left-column window)
+                    (/ border-width char-width))))
+         (left-body
+          (when body
+            (+ (window-pixel-left window) border-width
+               (if (eq (car (window-current-scroll-bars window)) 'left)
+                   (window-scroll-bar-width window)
+                 0)
+               (nth 0 (window-fringes window))
+               (* (or (nth 0 (window-margins window)) 0) char-width))))
+         (top (if pixelwise
+                  (+ (window-pixel-top window) border-width)
+                (+ (window-top-line window)
+                   (/ border-width char-height))))
+         (top-body
+          (when body
+            (+ (window-pixel-top window) border-width
+               (window-header-line-height window))))
+         (right (+ left (if pixelwise
+                            (window-pixel-width window)
+                          (window-total-width window))))
+         (right-body (and body (+ left-body (window-body-width window t))))
+         (bottom (+ top (if pixelwise
+                            (window-pixel-height window)
+                          (window-total-height window))))
+         (bottom-body (and body (+ top-body (window-body-height window t))))
+         left-off right-off)
+    (if absolute
+        (let* ((native-edges (frame-edges frame 'native-edges))
+               (left-off (nth 0 native-edges))
+               (top-off (nth 1 native-edges)))
+              (if body
+                  (list (+ left-body left-off) (+ top-body top-off)
+                        (+ right-body left-off) (+ bottom-body top-off))
+                (list (+ left left-off) (+ top top-off)
+                      (+ right left-off) (+ bottom top-off))))
+      (if body
+          (if pixelwise
+              (list left-body top-body right-body bottom-body)
+            (list (/ left-body char-width) (/ top-body char-height)
+                  ;; Round up.
+                  (/ (+ right-body char-width -1) char-width)
+                  (/ (+ bottom-body char-height -1) char-height)))
+        (list left top right bottom)))))
+
+(defun window-body-edges (&optional window)
+  "Return a list of the edge coordinates of WINDOW's body.
+The return value is that of `window-edges' called with argument
+BODY non-nil."
+  (window-edges window t))
+(defalias 'window-inside-edges 'window-body-edges)
+
+(defun window-pixel-edges (&optional window)
+  "Return a list of the edge pixel coordinates of WINDOW.
+The return value is that of `window-edges' called with argument
+PIXELWISE non-nil."
+  (window-edges window nil nil t))
+
+(defun window-body-pixel-edges (&optional window)
+  "Return a list of the edge pixel coordinates of WINDOW's body.
+The return value is that of `window-edges' called with arguments
+BODY and PIXELWISE non-nil."
+  (window-edges window t nil t))
+(defalias 'window-inside-pixel-edges 'window-body-pixel-edges)
+
+(defun window-absolute-pixel-edges (&optional window)
+  "Return a list of the edge pixel coordinates of WINDOW.
+The return value is that of `window-edges' called with argument
+ABSOLUTE non-nil."
+  (window-edges window nil t t))
+
+(defun window-absolute-body-pixel-edges (&optional window)
+  "Return a list of the edge pixel coordinates of WINDOW's text area.
+The return value is that of `window-edges' called with arguments
+BODY and ABSOLUTE non-nil."
+  (window-edges window t t t))
+(defalias 'window-inside-absolute-pixel-edges 'window-absolute-body-pixel-edges)
+
+(defun window-absolute-pixel-position (&optional position window)
+  "Return display coordinates of POSITION in WINDOW.
+If the buffer position POSITION is visible in window WINDOW,
+return the display coordinates of the upper/left corner of the
+glyph at POSITION.  The return value is a cons of the X- and
+Y-coordinates of that corner, relative to an origin at (0, 0) of
+WINDOW's display.  Return nil if POSITION is not visible in
+WINDOW.
+
+WINDOW must be a live window and defaults to the selected window.
+POSITION defaults to the value of `window-point' of WINDOW."
+  (let* ((window (window-normalize-window window t))
+         (pos-in-window
+          (pos-visible-in-window-p
+           (or position (window-point window)) window t)))
+    (when pos-in-window
+      (let ((edges (window-absolute-body-pixel-edges window)))
+        (cons (+ (nth 0 edges) (nth 0 pos-in-window))
+              (+ (nth 1 edges) (nth 1 pos-in-window)))))))
+
 (defun frame-root-window-p (window)
   "Return non-nil if WINDOW is the root window of its frame."
   (eq window (frame-root-window window)))