+DEFUN ("window-text-pixel-size", Fwindow_text_pixel_size, Swindow_text_pixel_size, 0, 6, 0,
+ doc: /* Return the size of the text of WINDOW's buffer in pixels.
+WINDOW must be a live window and defaults to the selected one. The
+return value is a cons of the maximum pixel-width of any text line and
+the maximum pixel-height of all text lines.
+
+The optional argument FROM, if non-nil, specifies the first text
+position and defaults to the minimum accessible position of the buffer.
+If FROM is t, use the minimum accessible position that is not a newline
+character. TO, if non-nil, specifies the last text position and
+defaults to the maximum accessible position of the buffer. If TO is t,
+use the maximum accessible position that is not a newline character.
+
+The optional argument X_LIMIT, if non-nil, specifies the maximum text
+width that can be returned. X_LIMIT nil or omitted, means to use the
+pixel-width of WINDOW's body; use this if you do not intend to change
+the width of WINDOW. Use the maximum width WINDOW may assume if you
+intend to change WINDOW's width.
+
+The optional argument Y_LIMIT, if non-nil, specifies the maximum text
+height that can be returned. Text lines whose y-coordinate is beyond
+Y_LIMIT are ignored. Since calculating the text height of a large
+buffer can take some time, it makes sense to specify this argument if
+the size of the buffer is unknown.
+
+Optional argument MODE_AND_HEADER_LINE nil or omitted means do not
+include the height of the mode- or header-line of WINDOW in the return
+value. If it is either the symbol `mode-line' or `header-line', include
+only the height of that line, if present, in the return value. If t,
+include the height of both, if present, in the return value. */)
+ (Lisp_Object window, Lisp_Object from, Lisp_Object to, Lisp_Object x_limit, Lisp_Object y_limit,
+ Lisp_Object mode_and_header_line)
+{
+ struct window *w = decode_live_window (window);
+ Lisp_Object buf;
+ struct buffer *b;
+ struct it it;
+ struct buffer *old_buffer = NULL;
+ ptrdiff_t start, end, pos;
+ struct text_pos startp;
+ void *itdata = NULL;
+ int c, max_y = -1, x = 0, y = 0;
+
+ buf = w->contents;
+ CHECK_BUFFER (buf);
+ b = XBUFFER (buf);
+
+ if (b != current_buffer)
+ {
+ old_buffer = current_buffer;
+ set_buffer_internal (b);
+ }
+
+ if (NILP (from))
+ start = BEGV;
+ else if (EQ (from, Qt))
+ {
+ start = pos = BEGV;
+ while ((pos++ < ZV) && (c = FETCH_CHAR (pos))
+ && (c == ' ' || c == '\t' || c == '\n' || c == '\r'))
+ start = pos;
+ while ((pos-- > BEGV) && (c = FETCH_CHAR (pos)) && (c == ' ' || c == '\t'))
+ start = pos;
+ }
+ else
+ {
+ CHECK_NUMBER_COERCE_MARKER (from);
+ start = min (max (XINT (from), BEGV), ZV);
+ }
+
+ if (NILP (to))
+ end = ZV;
+ else if (EQ (to, Qt))
+ {
+ end = pos = ZV;
+ while ((pos-- > BEGV) && (c = FETCH_CHAR (pos))
+ && (c == ' ' || c == '\t' || c == '\n' || c == '\r'))
+ end = pos;
+ while ((pos++ < ZV) && (c = FETCH_CHAR (pos)) && (c == ' ' || c == '\t'))
+ end = pos;
+ }
+ else
+ {
+ CHECK_NUMBER_COERCE_MARKER (to);
+ end = max (start, min (XINT (to), ZV));
+ }
+
+ if (!NILP (y_limit))
+ {
+ CHECK_NUMBER (y_limit);
+ max_y = min (XINT (y_limit), INT_MAX);
+ }
+
+ itdata = bidi_shelve_cache ();
+ SET_TEXT_POS (startp, start, CHAR_TO_BYTE (start));
+ start_display (&it, w, startp);
+
+ if (NILP (x_limit))
+ x = move_it_to (&it, end, -1, max_y, -1, MOVE_TO_POS | MOVE_TO_Y);
+ else
+ {
+ CHECK_NUMBER (x_limit);
+ it.last_visible_x = min (XINT (x_limit), INFINITY);
+ /* Actually, we never want move_it_to stop at to_x. But to make
+ sure that move_it_in_display_line_to always moves far enough,
+ we set it to INT_MAX and specify MOVE_TO_X. */
+ x = move_it_to (&it, end, INT_MAX, max_y, -1,
+ MOVE_TO_POS | MOVE_TO_X | MOVE_TO_Y);
+ }
+
+ y = it.current_y + it.max_ascent + it.max_descent;
+
+ if (!EQ (mode_and_header_line, Qheader_line)
+ && !EQ (mode_and_header_line, Qt))
+ /* Do not count the header-line which was counted automatically by
+ start_display. */
+ y = y - WINDOW_HEADER_LINE_HEIGHT (w);
+
+ if (EQ (mode_and_header_line, Qmode_line)
+ || EQ (mode_and_header_line, Qt))
+ /* Do count the mode-line which is not included automatically by
+ start_display. */
+ y = y + WINDOW_MODE_LINE_HEIGHT (w);
+
+ bidi_unshelve_cache (itdata, 0);
+
+ if (old_buffer)
+ set_buffer_internal (old_buffer);
+
+ return Fcons (make_number (x), make_number (y));
+}