% Copyright    Barbara Liskov    1985

x_window = cluster is none, create, create_transparency,
		      destroy, destroy_subwindows, map, map_subwindows,
		      unmap, unmap_subwindows, unmap_transparent, raise, lower,
		      circulate_up, circulate_down, move, change, configure,
		      set_background, set_border, set_tilemode, set_clipmode,
		      query, query_tree, get_name, set_name, set_icon,
		      get_resize, set_resize, set_cursor, set_input,
		      grab_mouse, ungrab_mouse, grab_button, ungrab_button,
		      query_mouse, interpret_locator,
		      warp_mouse, cond_warp_mouse,
		      focus_keyboard, clear, pix_set, pix_fill, tile_set,
		      tile_fill, pixmap_put, pixmap_xybitsput, pixmap_zbitsput,
		      bitmap_bitsput, move_area, copy_area,
		      text, textv, texta, text_pad, textv_pad, texta_pad,
		      text_mask, textv_mask, texta_mask,
		      text_mask_pad, textv_mask_pad, texta_mask_pad,
		      line, draw,
		      draw_dashed, draw_patterned, draw_filled, draw_tiled,
		      save_region, read_xyregion, read_zregion,
		      get_id, equal, similar, copy

rep = int

none = proc () returns (cvt)
    return(0)
    end none

create = proc (x, y, width, height: int, background: x_pixmap, parent: cvt,
	       borderwidth: int, border: x_pixmap) returns (cvt)
	   signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_createwindow + (borderwidth * 2**8)
    er.ewin := parent
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    lr(er).l2 := border.id
    lr(er).l3 := background.id
    x_buf$receive()
       resignal error
    return(x_buf$get_lp0())
    end create

create_transparency = proc (x, y, width, height: int, parent: cvt) returns (cvt)
			signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_createtransparency
    er.ewin := parent
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    x_buf$receive()
       resignal error
    return(x_buf$get_lp0())
    end create_transparency

destroy = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_destroywindow
    er.ewin := w
    end destroy

destroy_subwindows = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_destroysubwindows
    er.ewin := w
    end destroy_subwindows

map = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_mapwindow
    er.ewin := w
    end map

map_subwindows = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_mapsubwindows
    er.ewin := w
    end map_subwindows

unmap = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_unmapwindow
    er.ewin := w
   end unmap

unmap_subwindows = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_unmapsubwindows
    er.ewin := w
    end unmap_subwindows

unmap_transparent = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_unmaptransparent
    er.ewin := w
    end unmap_transparent

raise = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_raisewindow
    er.ewin := w
    end raise

lower = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_lowerwindow
    er.ewin := w
    end lower

circulate_up = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_circwindowup
    er.ewin := w
    end circulate_up

circulate_down = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_circwindowdown
    er.ewin := w
    end circulate_down

move = proc (w: cvt, x, y: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_movewindow
    er.ewin := w
    er.s0 := x
    or.s1 := y
    end move

change = proc (w: cvt, width, height: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_changewindow
    er.ewin := w
    er.s0 := height
    or.s1 := width
    end change

configure = proc (w: cvt, x, y, width, height: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_configurewindow
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    end configure

set_background = proc (w: cvt, background: x_pixmap)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_changebackground
    er.ewin := w
    lr(er).l0 := p2i(background)
    end set_background

set_border = proc (w: cvt, border: x_pixmap)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_changeborder
    er.ewin := w
    lr(er).l0 := p2i(border)
    end set_border

set_tilemode = proc (w: cvt, relative: bool)
    or: oreq, er: ereq := x_buf$get()
    if relative
       then er.code := x_tilemode + (TileModeRelative * 2**8)
       else er.code := x_tilemode + (TileModeAbsolute * 2**8)
       end
    er.ewin := w
    end set_tilemode

set_clipmode = proc (w: cvt, drawthru: bool)
    or: oreq, er: ereq := x_buf$get()
    if drawthru
       then er.code := x_clipmode + (ClipModeDrawThru * 2**8)
       else er.code := x_clipmode + (ClipModeClipped * 2**8)
       end
    er.ewin := w
    end set_clipmode

% returns (x, y, width, height, border, map, kind, icon)

query = proc (w: cvt) returns (int, int, int, int, int, int, int, cvt)
	  signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_querywindow
    er.ewin := w
    x_buf$receive()
       resignal error
    return(x_buf$get_sp2(), x_buf$get_sp3(), x_buf$get_sp1(), x_buf$get_sp0(),
	   x_buf$get_sp4(), x_buf$get_bp10(), x_buf$get_bp11(),
	   x_buf$get_lp3())
    end query

query_tree = proc (w: cvt) returns (cvt, wlist) signals (error(string))
    wlist = array[x_window]
    or: oreq, er: ereq := x_buf$get()
    er.code := x_querytree
    er.ewin := w
    x_buf$receive()
       resignal error
    parent: int := x_buf$get_lp0()
    n: int := x_buf$get_lp1()
    subs: wlist := wlist$fill(1, n, up(parent))
    if n > 0
       then b: _bytevec := _bytevec$create(n * 4)
	    x_buf$receive_data(b)
	    for i: int in int$from_to(1, n) do
		subs[i] := up(b2w(b)[i])
		end
       end
    return(parent, subs)
    end query_tree

get_name = proc (w: cvt) returns (string) signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_fetchname
    er.ewin := w
    x_buf$receive()
       resignal error
    n: int := x_buf$get_sp0()
    if n = 0
       then return("") end
    b: _bytevec := _bytevec$create(n)
    x_buf$receive_data(b)
    return(b2s(b))
    end get_name

set_name = proc (w: cvt, n: string)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_storename
    er.ewin := w
    er.s0 := string$size(n)
    x_buf$send_data(s2b(n), 1, string$size(n))
    end set_name

set_icon = proc (w, icon: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_seticonwindow
    er.ewin := w
    lr(er).l0 := icon
    end set_icon

get_resize = proc (w: cvt) returns (int, int, int, int) signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_getresizehint
    er.ewin := w
    x_buf$receive()
       resignal error
    return(x_buf$get_sp2(), x_buf$get_sp3(), x_buf$get_sp0(), x_buf$get_sp1())
    end get_resize

set_resize = proc (w: cvt, width0, widthinc, height0, heightinc: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_setresizehint
    er.ewin := w
    er.s0 := height0
    or.s1 := heightinc
    er.s2 := width0
    or.s3 := widthinc
    end set_resize

set_cursor = proc (w: cvt, cursor: x_cursor)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_definecursor
    er.ewin := w
    lr(er).l0 := c2i(cursor)
    end set_cursor

set_input = proc (w: cvt, mask: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_selectinput
    er.ewin := w
    lr(er).l0 := mask
    end set_input

grab_mouse = proc (w: cvt, mask: int, cursor: x_cursor) signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_grabmouse
    er.ewin := w
    lr(er).l0 := c2i(cursor)
    lr(er).l1 := mask
    x_buf$receive()
       resignal error
    end grab_mouse

ungrab_mouse = proc ()
    or: oreq, er: ereq := x_buf$get()
    er.code := x_ungrabmouse
    end ungrab_mouse

grab_button = proc (w: cvt, button, mask: int, cursor: x_cursor)
		signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_grabbutton
    or.mask := button
    er.ewin := w
    lr(er).l0 := c2i(cursor)
    lr(er).l1 := mask
    x_buf$receive()
       resignal error
    end grab_button

ungrab_button = proc (button: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_ungrabmouse
    or.mask := button
    end ungrab_button

% returns (x, y, window)

query_mouse = proc (w: cvt) returns (int, int, cvt) signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_querymouse
    er.ewin := w
    x_buf$receive()
       resignal error
    return(x_buf$get_sp2(), x_buf$get_sp3(), x_buf$get_lp0())
    end query_mouse

interpret_locator = proc (w: cvt, x, y: int) returns (int, int, cvt)
		      signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_interpretlocator
    er.ewin := w
    er.s0 := y
    or.s1 := x
    x_buf$receive()
       resignal error
    return(x_buf$get_sp2(), x_buf$get_sp3(), x_buf$get_lp0())
    end interpret_locator

warp_mouse = proc (w: cvt, x, y: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_warpmouse
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := down(x_display$root())
    er.s4 := 0
    or.s5 := 0
    er.s6 := 0
    or.s7 := 0
    end warp_mouse

cond_warp_mouse = proc (dstw: cvt, dstx, dsty: int, srcw: cvt,
			srcx, srcy, srcwidth, srcheight: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_warpmouse
    er.ewin := dstw
    er.s0 := dstx
    or.s1 := dsty
    lr(er).l1 := srcw
    er.s4 := srcheight
    or.s5 := srcwidth
    er.s6 := srcx
    or.s7 := srcy
    end cond_warp_mouse

focus_keyboard = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_focuskeyboard
    er.ewin := w
    end focus_keyboard

clear = proc (w: cvt)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_clear
    er.ewin := w
    end clear

pix_set = proc (w: cvt, pixel, x, y, width, height: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_pixfill + (GXcopy * 2**8)
    or.mask := -1
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    er.s4 := pixel
    lr(er).l3 := 0
    end pix_set

pix_fill = proc (w: cvt, pixel: int, mask: x_bitmap, x, y, width, height: int,
		 func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_pixfill + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    er.s4 := pixel
    lr(er).l3 := b2i(mask)
    end pix_fill

tile_set = proc (w: cvt, tile: x_pixmap, x, y, width, height: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_tilefill + (GXcopy * 2**8)
    or.mask := -1
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    lr(er).l2 := p2i(tile)
    lr(er).l3 := 0
    end tile_set

tile_fill = proc (w: cvt, tile: x_pixmap, mask: x_bitmap,
		  x, y, width, height, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_tilefill + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    lr(er).l2 := p2i(tile)
    lr(er).l3 := b2i(mask)
    end tile_fill

pixmap_put = proc (w: cvt, pix: x_pixmap,
		   srcx, srcy, width, height, dstx, dsty, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_pixmapput + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := srcx
    or.s3 := srcy
    lr(er).l2 := p2i(pix)
    er.s6 := dstx
    or.s7 := dsty
    end pixmap_put

pixmap_zbitsput = proc (w: cvt, width, height: int, bits: _wordvec,
			mask: x_bitmap, x, y, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_pixmapbitsput + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    er.s4 := ZFormat
    lr(er).l3 := b2i(mask)
    z: int := width * height
    if x_display$planes() > 8
       then z := z + z end
    x_buf$send_data(w2b(bits), 1, z)
    end pixmap_zbitsput

pixmap_xybitsput = proc (w: cvt, width, height: int, bits: _wordvec,
			 mask: x_bitmap, x, y, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_pixmapbitsput + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    er.s4 := XYFormat
    lr(er).l3 := b2i(mask)
    x_buf$send_data(w2b(bits), 1,
		    ((width + 15) / 16) * height * 2 * x_display$planes())
    end pixmap_xybitsput

bitmap_bitsput = proc (w: cvt, width, height: int, bits: _wordvec,
		       fore, back: int, mask: x_bitmap, x, y, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_bitmapbitsput + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    er.s4 := fore
    or.s5 := back
    lr(er).l3 := b2i(mask)
    x_buf$send_data(w2b(bits), 1, ((width + 15) / 16) * height * 2)
    end bitmap_bitsput

move_area = proc (w: cvt, srcx, srcy, width, height, dstx, dsty: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_copyarea + (GXcopy * 2**8)
    or.mask := -1
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := srcx
    or.s3 := srcy
    er.s6 := dstx
    or.s7 := dsty
    end move_area

copy_area = proc (w: cvt, srcx, srcy, width, height, dstx, dsty: int,
		  func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_copyarea + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := srcx
    or.s3 := srcy
    er.s6 := dstx
    or.s7 := dsty
    end copy_area

text = proc (w: cvt, s: string, font: x_font, fore, back, x, y: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_text + (GXcopy * 2**8)
    or.mask := -1
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := fore
    or.s5 := back
    er.s6 := string$size(s)
    x_buf$send_data(s2b(s), 1, string$size(s))
    end text

textv = proc (w: cvt, b: _bytevec, start, z: int, font: x_font,
	      fore, back, x, y: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_text + (GXcopy * 2**8)
    or.mask := -1
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := fore
    or.s5 := back
    er.s6 := z
    x_buf$send_data(b, start, z)
    end textv

texta = proc (w: cvt, a: array[char], start, z: int, font: x_font,
	      fore, back, x, y: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_text + (GXcopy * 2**8)
    or.mask := -1
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := fore
    or.s5 := back
    er.s6 := z
    x_buf$send_array(a, start, z)
    end texta

text_pad = proc (w: cvt, s: string, font: x_font, fore, back, cpad, spad: int,
		 x, y: int, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_text + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := fore
    or.s5 := back
    er.s6 := string$size(s)
    or.s7 := (cpad // 2**8) + (spad * 2**8)
    x_buf$send_data(s2b(s), 1, string$size(s))
    end text_pad

textv_pad = proc (w: cvt, b: _bytevec, start, z: int, font: x_font,
		  fore, back, cpad, spad: int, x, y: int, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_text + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := fore
    or.s5 := back
    er.s6 := z
    or.s7 := (cpad // 2**8) + (spad * 2**8)
    x_buf$send_data(b, start, z)
    end textv_pad

texta_pad = proc (w: cvt, a: array[char], start, z: int, font: x_font,
		  fore, back, cpad, spad: int, x, y: int, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_text + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := fore
    or.s5 := back
    er.s6 := z
    or.s7 := (cpad // 2**8) + (spad * 2**8)
    x_buf$send_array(a, start, z)
    end texta_pad

text_mask = proc (w: cvt, s: string, font: x_font, pixel, x, y: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_textmask + (GXcopy * 2**8)
    or.mask := -1
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := pixel
    er.s6 := string$size(s)
    x_buf$send_data(s2b(s), 1, string$size(s))
    end text_mask

textv_mask = proc (w: cvt, b: _bytevec, start, z: int, font: x_font,
		   pixel, x, y: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_textmask + (GXcopy * 2**8)
    or.mask := -1
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := pixel
    er.s6 := z
    x_buf$send_data(b, start, z)
    end textv_mask

texta_mask = proc (w: cvt, a: array[char], start, z: int, font: x_font,
		   pixel, x, y: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_textmask + (GXcopy * 2**8)
    or.mask := -1
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := pixel
    er.s6 := z
    x_buf$send_array(a, start, z)
    end texta_mask

text_mask_pad = proc (w: cvt, s: string, font: x_font, pixel, cpad, spad: int,
		      x, y: int, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_textmask + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := pixel
    er.s6 := string$size(s)
    or.s7 := (cpad // 2**8) + (spad * 2**8)
    x_buf$send_data(s2b(s), 1, string$size(s))
    end text_mask_pad

textv_mask_pad = proc (w: cvt, b: _bytevec, start, z: int, font: x_font,
		       pixel, cpad, spad: int, x, y: int, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_textmask + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := pixel
    er.s6 := z
    or.s7 := (cpad // 2**8) + (spad * 2**8)
    x_buf$send_data(b, start, z)
    end textv_mask_pad

texta_mask_pad = proc (w: cvt, a: array[char], start, z: int, font: x_font,
		       pixel, cpad, spad: int, x, y: int, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_textmask + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := x
    or.s1 := y
    lr(er).l1 := f2i(font)
    er.s4 := pixel
    er.s6 := z
    or.s7 := (cpad // 2**8) + (spad * 2**8)
    x_buf$send_array(a, start, z)
    end texta_mask_pad

line = proc (w: cvt, pixel, width, height, x1, y1, x2, y2, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_line + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := x1
    or.s1 := y1
    er.s2 := x2
    or.s3 := y2
    er.s4 := pixel
    or.s5 := (height // 2**8) + (width * 2**8)
    end line

draw = proc (w: cvt, verts: x_vlist, z, pixel, width, height, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_draw + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := z
    or.s1 := pixel
    er.s2 := (height // 2**8) + (width * 2**8)
    or.s3 := DrawSolidLine
    x_buf$send_data(v2b(verts), 1, 6 * z)
    end draw

draw_dashed = proc (w: cvt, verts: x_vlist, z, pixel, width, height: int,
		    pattern, patlen, patmul, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_draw + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := z
    or.s1 := pixel
    er.s2 := (height // 2**8) + (width * 2**8)
    or.s3 := DrawDashedLine
    or.s5 := pattern
    er.s6 := patlen
    or.s7 := patmul
    x_buf$send_data(v2b(verts), 1, 6 * z)
    end draw_dashed

draw_patterned = proc (w: cvt, verts: x_vlist, z, pixel, altpix: int,
			width, height, pattern, patlen, patmul, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_draw + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := z
    or.s1 := pixel
    er.s2 := (height // 2**8) + (width * 2**8)
    or.s3 := DrawPatternedLine
    er.s4 := altpix
    or.s5 := pattern
    er.s6 := patlen
    or.s7 := patmul
    x_buf$send_data(v2b(verts), 1, 6 * z)
    end draw_patterned

draw_filled = proc (w: cvt, verts: x_vlist, z, pixel, func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_drawfilled + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := z
    or.s1 := pixel
    lr(er).l1 := 0
    x_buf$send_data(v2b(verts), 1, 6 * z)
    end draw_filled

draw_tiled = proc (w: cvt, verts: x_vlist, z: int, tile: x_pixmap,
		   func, planes: int)
    or: oreq, er: ereq := x_buf$get()
    er.code := x_drawfilled + (func * 2**8)
    or.mask := planes
    er.ewin := w
    er.s0 := z
    lr(er).l1 := p2i(tile)
    x_buf$send_data(v2b(verts), 1, 6 * z)
    end draw_tiled

save_region = proc (w: cvt, x, y, width, height: int) returns (x_pixmap)
		signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_pixmapsave
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    x_buf$receive()
       resignal error
    return(_cvt[int, x_pixmap](x_buf$get_lp0()))
    end save_region

read_xyregion = proc (w: cvt, x, y, width, height: int) returns (_wordvec)
		signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_pixmapget + (XYFormat * 2**8)
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    x_buf$receive()
       resignal error
    b: _bytevec := _bytevec$create(x_buf$get_lp0())
    x_buf$receive_data(b)
    return(b2w(b))
    end read_xyregion

read_zregion = proc (w: cvt, x, y, width, height: int) returns (_wordvec)
		signals (error(string))
    or: oreq, er: ereq := x_buf$get()
    er.code := x_pixmapget + (ZFormat * 2**8)
    er.ewin := w
    er.s0 := height
    or.s1 := width
    er.s2 := x
    or.s3 := y
    x_buf$receive()
       resignal error
    b: _bytevec := _bytevec$create(x_buf$get_lp0())
    x_buf$receive_data(b)
    return(b2w(b))
    end read_zregion

get_id = proc (w: cvt) returns (int)
    return(w)
    end get_id

equal = proc (w1, w2: cvt) returns (bool)
    return(w1 = w2)
    end equal

similar = proc (w1, w2: cvt) returns (bool)
    return(w1 = w2)
    end similar

copy = proc (w: cvt) returns (cvt)
    return(w)
    end copy

end x_window