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! Copyright (C) 2011
! Free Software Foundation, Inc.
! This file is part of the gtk-fortran GTK+ Fortran Interface library.
! This is free software; you can redistribute it and/or modify
! it under the terms of the GNU General Public License as published by
! the Free Software Foundation; either version 3, or (at your option)
! any later version.
! This software is distributed in the hope that it will be useful,
! but WITHOUT ANY WARRANTY; without even the implied warranty of
! GNU General Public License for more details.
! Under Section 7 of GPL version 3, you are granted additional
! permissions described in the GCC Runtime Library Exception, version
! 3.1, as published by the Free Software Foundation.
! You should have received a copy of the GNU General Public License along with
! this program; see the files COPYING3 and COPYING.RUNTIME respectively.
! If not, see <>.
! Contributed by James Tappin
! Some code derived from a demo program by "tadeboro" posted on the gtk forums.
! Last modification: 07-24-2012
!!$T Template file for gtk-draw-hl.f90.
!!$T Make edits to this file, and keep them identical between the
!!$T GTK2 & GTK3 branches.
!!$T Lines to appear only in specific versions should be prefixed by
!!$T !!$<lib><op><ver>!
!!$T Where <lib> is GTK or GLIB, <op> is one of < > <= >=
!!$T and <ver> is the version boundary, e.g. !!$GTK<=2.24! to include
!!$T the line in GTK+ version 2.24 and higher.
!!$T The script should be used to generate the source file.
module gtk_draw_hl
! gtk_draw_hl
! This module provides a high-level drawing interface which automatically
! handles redrawing on exposure, and bundles the most likely events to
! be needed.
! Note:
! This module has undergone a major rewrite which has considerably
! streamlined the code. To the ordinary user, the most noticable difference
! is that the backing image is now a cairo image surface rather than a
! GDK pixbuf. When using PLplot, the "memcairo" device is not readily usable
! any more, however cumulative plotting (e.g. PLplot's strip charts) now
! works correctly.
! ### Routine List
! * hl_gtk_drawing_area_new; Create the drawing area.
! * hl_gtk_drawing_area_get_surface; Get the backing cairo surface
! * hl_gtk_drawing_area_expose_cb; Default callback for expose events.
! * hl_gtk_drawing_area_destroy_cb; Default callback for destroy signal
! * hl_gtk_drawing_area_resize_cb; Default callback for size-allocate signal
! * hl_gtk_drawing_area_cairo_new; Create a cairo context attached to the
! backing surface.
! * hl_gtk_drawing_area_resize: Resize the drawing area and the backing
! surface
! * hl_gtk_drawing_area_cairo_destroy; Destroy the context.
use gtk, only: gtk_drawing_area_new, gtk_scrolled_window_add_with_viewport,&
& gtk_scrolled_window_new, gtk_scrolled_window_set_policy, &
& gtk_widget_add_events, gtk_widget_get_window, gtk_widget_queue_draw, &
& gtk_widget_set_can_focus, gtk_widget_set_size_request, &
& gtk_widget_set_tooltip_text, g_signal_connect, &
& gtk_widget_get_allocation
use cairo, only: cairo_create, cairo_destroy, cairo_get_target, &
& cairo_image_surface_create, cairo_paint, cairo_set_source, &
& cairo_set_source_surface, cairo_surface_destroy, &
& cairo_surface_reference, cairo_surface_get_type, &
& cairo_surface_get_reference_count
use gdk, only: gdk_cairo_create
use g, only: g_object_get_data, g_object_set_data
use iso_c_binding
use iso_fortran_env, only: error_unit
implicit none
! Type definition for a cairo_user_data_key
type, bind(c) :: cairo_user_data_key_t
integer(kind=c_int) :: dummy
end type cairo_user_data_key_t
type, bind(c) :: gtkallocation
integer(kind=c_int) :: x,y,width,height
end type gtkallocation
function hl_gtk_drawing_area_new(scroll, size, ssize, expose_event, &
& data_expose, button_press_event, data_button_press, &
& button_release_event, data_button_release, scroll_event, &
& data_scroll, motion_event, data_motion, realize, data_realize, &
& configure_event, data_configure, key_press_event, data_key_press, &
& key_release_event, data_key_release, enter_event, data_enter, &
& leave_event, data_leave, destroy, data_destroy, event_mask, &
& event_exclude, auto_add_mask, &
& tooltip, has_alpha, size_allocate, data_size_allocate) result(plota)
type(c_ptr) :: plota
type(c_ptr), intent(out), optional :: scroll
integer(kind=c_int), intent(in), optional, dimension(2) :: size, ssize
type(c_funptr), optional :: expose_event, button_press_event, &
& button_release_event, scroll_event, key_press_event, &
& key_release_event, motion_event, realize, configure_event,&
& enter_event, leave_event, destroy, size_allocate
type(c_ptr), intent(in), optional :: data_expose, data_button_press, &
& data_button_release, data_scroll, data_motion, data_realize, &
& data_configure, data_key_press, data_key_release, data_enter, &
& data_leave, data_destroy, data_size_allocate
integer(kind=c_int), intent(in), optional :: event_mask, event_exclude
integer(kind=c_int), intent(in), optional :: auto_add_mask
character(kind=c_char), dimension(*), optional, intent(in) :: tooltip
integer(kind=c_int), intent(in), optional :: has_alpha
! A high-level drawing area
! SCROLL: c_ptr: optional: If present, then the drawing area will be
! placed in a scrollable window, whose pointer will be returned
! here. If it is present, then it rather than the drawable should
! be used for packing.
! SIZE: c_int(): optional: The requested size for the area. If no size is
! given then a default size of 256x256 is used.
! SSIZE: c_int() :: optional: The requested size for a scrolling window
! EXPOSE_EVENT: c_funptr: optional: Callback for expose-event signal
! N.B. In GTK3 the signal is called "draw". If this is not given
! then a default handler is provided which copies the image
! surface to the drawing area.
! DATA_EXPOSE: c_ptr: optional: Data for expose_event callback
! BUTTON_PRESS_EVENT: c_funptr: optional: Callback for button-press-event
! signal
! DATA_BUTTON_PRESS: c_ptr: optional: Data for button_press_event callback
! BUTTON_RELEASE_EVENT: c_funptr: optional: Callback for
! button-release-event signal
! DATA_BUTTON_RELEASE: c_ptr: optional: Data for button_release_event
! callback
! SCROLL_EVENT: c_funptr: optional: Callback for scroll-event signal
! DATA_SCROLL: c_ptr: optional: Data for scroll_event callback
! REALIZE: c_funptr: optional: Callback for realize signal
! DATA_REALIZE: c_ptr: optional: Data for realize callback
! CONFIGURE_EVENT:c_funptr: optional: Callback for configure-event signal
! DATA_CONFIGURE: c_ptr: optional: Data for configure_event callback
! KEY_PRESS_EVENT: c_funptr: optional: Callback for key-press-event
! signal
! DATA_KEY_PRESS: c_ptr: optional: Data for key_press_event callback
! KEY_RELEASE_EVENT: c_funptr: optional: Callback for
! key-release-event signal
! DATA_KEY_RELEASE: c_ptr: optional: Data for key_release_event
! callback
! MOTION_EVENT: c_funptr: optional: Callback for the motion-notify-event
! signal
! DATA_MOTION: c_ptr: optional: Data for motion_event
! ENTER_EVENT: c_funptr: optional: Callback for the enter-notify-event
! signal
! DATA_ENTER: c_ptr: optional: Data for enter_event
! LEAVE_EVENT: c_funptr: optional: Callback for the leave-notify-event
! signal
! DATA_LEAVE: c_ptr: optional: Data for leave_event
! DESTROY: c_funptr: optional: Callback when the widget is destroyed.
! DATA_DESTROY: c_ptr: optional: Data to pass to the destroy callback.
! EVENT_MASK: c_int: optional: Mask for which events to pass.
! EVENT_EXCLUDE: c_int: optional: Mask for events not to pass (this might
! used to prevent auto-enabling an event that should only
! be enabled by user actions)
! AUTO_ADD_MASK: boolean: optional: Set to FALSE to disable automatically
! adding events to the event mask if a handler is provided.
! TOOLTIP: string: optional: Tooltip for the drawing area.
! HAS_ALPHA: boolean: optional: If a pixbuf is used, should it have
! an alpha (transparency) channel (default=FALSE)
! SIZE_ALLOCATE: c_funptr: optional: Callback for the
! 'size-allocate' signal
! DATA_SIZE_ALLOCATE: c_ptr: optional: Data for size_allocate.
! Odd notes on mask interactions and other things.
! * Scroll (wheel) events, are enabled by GDK_SCROLL_MASK or
! GDK_BUTTON_PRESS_MASK, thus (as far as I can see) there is no way
! to mask wheel events while allowing button presses to be processed.
! * It does not appear to be possible to remove events by unsetting bits
! in the event mask.
! * Adding a tooltip looks to implicitly enable some events.
! * An example where an explict EVENT_MASK and EVENT_EXCLUDE might be
! useful would be to enable motion events only if a button is down.
! * If an explicit size is given then the drawing area cannot be made
! smaller than that by resizing the containing window
type(c_ptr) :: isurface
integer(kind=c_int) :: mask, insert_mask
integer(kind=c_int) :: auto_add, s_type
integer(kind=c_int) :: szx, szy
plota = gtk_drawing_area_new()
if (present(size)) then
call gtk_widget_set_size_request(plota, size(1), size(2))
szx = size(1)
szy = size(2)
call gtk_widget_set_size_request(plota, -1, -1)
szx = -1
szy = -1
end if
! Add it to a scrolling window if one is requested
if (present(scroll)) then
scroll = gtk_scrolled_window_new(C_NULL_PTR, C_NULL_PTR)
call gtk_scrolled_window_set_policy(scroll, GTK_POLICY_AUTOMATIC, &
if (present(ssize)) &
& call gtk_widget_set_size_request(scroll, ssize(1), ssize(2))
call gtk_scrolled_window_add_with_viewport (scroll, plota)
end if
! Create the backing surface
if (present(has_alpha)) then
end if
isurface = cairo_image_surface_create(s_type, szx, szy)
isurface = cairo_surface_reference(isurface) ! Prevent accidental deletion
call g_object_set_data(plota, "backing-surface", isurface)
! Set the event mask, if event callbacks are provided, then
! the corresponding mask will be ORed in unless disabled by setting
! AUTO_ADD_MASK to FALSE, or for individual events by including the
! relevant mask in EVENT_EXCLUDE. Note that expose events are always
! enabled.
if (present(event_mask)) then
mask = ior(event_mask, GDK_EXPOSURE_MASK)
end if
if (present(event_exclude)) then
insert_mask = iand(not(event_exclude), GDK_ALL_EVENTS_MASK)
insert_mask = GDK_ALL_EVENTS_MASK
end if
if (present(auto_add_mask)) then
auto_add = auto_add_mask
auto_add = TRUE
end if
! Realize signal
if (present(realize)) then
if (present(data_realize)) then
call g_signal_connect(plota, "realize"//c_null_char, realize, &
& data_realize)
call g_signal_connect(plota, "realize"//c_null_char, realize)
end if
! Destroy signal
if (present(destroy)) then
if (present(data_destroy)) then
call g_signal_connect(plota, "destroy"//c_null_char, destroy, &
& data_destroy)
call g_signal_connect(plota, "destroy"//c_null_char, destroy)
end if
call g_signal_connect(plota, "destroy"//c_null_char, &
& c_funloc(hl_gtk_drawing_area_destroy_cb))
end if
! Size-allocate signal
if (present(size_allocate)) then
if (present(data_size_allocate)) then
call g_signal_connect(plota, "size-allocate"//c_null_char, &
& size_allocate, data_size_allocate)
call g_signal_connect(plota, "size-allocate"//c_null_char, &
& size_allocate)
end if
call g_signal_connect(plota, "size-allocate"//c_null_char, &
& c_funloc(hl_gtk_drawing_area_resize_cb))
end if
! Expose event
if (present(expose_event)) then
if (present(data_expose)) then
!!$GTK< 3.0! call g_signal_connect(plota, "expose-event"//c_null_char, expose_event, &
!!$GTK< 3.0! & data_expose)
!!$GTK>=3.0! call g_signal_connect(plota, "draw"//c_null_char, expose_event, &
!!$GTK>=3.0! & data_expose)
!!$GTK< 3.0! call g_signal_connect(plota, "expose-event"//c_null_char, expose_event)
!!$GTK>=3.0! call g_signal_connect(plota, "draw"//c_null_char, expose_event)
!!$GTK< 3.0! call g_signal_connect(plota, "expose-event"//c_null_char, &
!!$GTK< 3.0! & c_funloc(hl_gtk_drawing_area_expose_cb))
!!$GTK>=3.0! call g_signal_connect(plota, "draw"//c_null_char, &
!!$GTK>=3.0! & c_funloc(hl_gtk_drawing_area_expose_cb))
end if
! Button_press event
if (present(button_press_event)) then
if (present(data_button_press)) then
call g_signal_connect(plota, "button-press-event"//c_null_char, &
& button_press_event, data_button_press)
call g_signal_connect(plota, "button-press-event"//c_null_char, &
& button_press_event)
if (auto_add == TRUE) mask = ior(mask, &
& iand(GDK_BUTTON_PRESS_MASK, insert_mask))
end if
! Button_release event
if (present(button_release_event)) then
if (present(data_button_release)) then
call g_signal_connect(plota, "button-release-event"//c_null_char, &
& button_release_event, data_button_release)
call g_signal_connect(plota, "button-release-event"//c_null_char, &
& button_release_event)
if (auto_add == TRUE) mask = ior(mask, &
& iand(GDK_BUTTON_RELEASE_MASK, insert_mask))
end if
! Scroll event
if (present(scroll_event)) then
if (present(data_scroll)) then
call g_signal_connect(plota, "scroll-event"//c_null_char, &
&scroll_event, data_scroll)
call g_signal_connect(plota, "scroll-event"//c_null_char, &
& scroll_event)
if (auto_add == TRUE) mask = ior(mask, &
& iand(GDK_SCROLL_MASK, insert_mask))
end if
! Key_press event
if (present(key_press_event)) then
if (present(data_key_press)) then
call g_signal_connect(plota, "key-press-event"//c_null_char, &
& key_press_event, data_key_press)
call g_signal_connect(plota, "key-press-event"//c_null_char, &
& key_press_event)
! Note: For keyboard events, the drawing area must be able to
! accept input focus as well as the KEY events.
if (auto_add == TRUE) then
mask = ior(mask, iand(GDK_KEY_PRESS_MASK, insert_mask))
call gtk_widget_set_can_focus(plota, TRUE)
end if
end if
! Key_release event
if (present(key_release_event)) then
if (auto_add == TRUE) &
& call gtk_widget_add_events(plota, GDK_KEY_RELEASE_MASK)
if (present(data_key_release)) then
call g_signal_connect(plota, "key-release-event"//c_null_char, &
& key_release_event, data_key_release)
call g_signal_connect(plota, "key-release-event"//c_null_char, &
& key_release_event)
! Note: For keyboard events, the drawing area must be able to
! accept input focus as well as the KEY events.
if (auto_add == TRUE) then
mask = ior(mask, iand(GDK_KEY_RELEASE_MASK, insert_mask))
call gtk_widget_set_can_focus(plota, TRUE)
end if
end if
! Motion event
if (present(motion_event)) then
if (present(data_motion)) then
call g_signal_connect(plota, "motion-notify-event"//c_null_char, &
& motion_event, data_motion)
call g_signal_connect(plota, "motion-notify-event"//c_null_char, &
& motion_event)
if (auto_add == TRUE) mask = ior(mask, &
& iand(GDK_POINTER_MOTION_MASK, insert_mask))
end if
! Enter event
if (present(enter_event)) then
if (present(data_enter)) then
call g_signal_connect(plota, "enter-notify-event"//c_null_char, &
& enter_event, data_enter)
call g_signal_connect(plota, "enter-notify-event"//c_null_char, &
& enter_event)
if (auto_add == TRUE) mask = ior(mask, &
& iand(GDK_ENTER_NOTIFY_MASK, insert_mask))
end if
! Leave event
if (present(leave_event)) then
if (present(data_leave)) then
call g_signal_connect(plota, "leave-notify-event"//c_null_char, &
& leave_event, data_leave)
call g_signal_connect(plota, "leave-notify-event"//c_null_char, &
& leave_event)
if (auto_add == TRUE) mask = ior(mask, &
& iand(GDK_LEAVE_NOTIFY_MASK, insert_mask))
end if
! Configure event
if (present(configure_event)) then
if (present(data_configure)) then
call g_signal_connect(plota, "configure-event"//c_null_char, &
& configure_event, data_configure)
call g_signal_connect(plota, "configure-event"//c_null_char, &
& configure_event)
if (auto_add == TRUE) mask = ior(mask, &
& iand(GDK_STRUCTURE_MASK, insert_mask))
end if
! Apply the event mask
if (mask /= 0) call gtk_widget_add_events(plota, mask)
if (present(tooltip)) call gtk_widget_set_tooltip_text(plota, tooltip)
end function hl_gtk_drawing_area_new
function hl_gtk_drawing_area_get_surface(area) result(isurface)
type(c_ptr) :: isurface
type(c_ptr), intent(in) :: area
! Convenience routine to get the backing surface of a drawing area.
! AREA: c_ptr: required: The drawing area whose surface is required.
isurface = g_object_get_data(area, "backing-surface")
end function hl_gtk_drawing_area_get_surface
function hl_gtk_drawing_area_expose_cb(area, event, data) bind(c) &
& result(rv)
integer(kind=c_int) :: rv
type(c_ptr), value :: area, event, data
! Default callback for exposing a drawing area. For this to be connected
! no explicit expose callback should be specified.
! AREA: c_ptr: required: The drawing area
! EVENT: c_ptr: required: GTK2 = event structure, GTK3 = a cairo context
! Since this differs between versions, we won't use it.
! DATA: c_ptr: required: A pointer to user data (not used).
type(c_ptr) :: cr, isurface
isurface = g_object_get_data(area, "backing-surface")
if (.not. c_associated(isurface)) then
write(error_unit,*) &
& 'hl_gtk_drawing_area_expose_cb: Backing surface is NULL'
end if
! Note for plplot users, this cairo context is a different one from
! the context used by plplot for the actual drawing.
cr = gdk_cairo_create(gtk_widget_get_window(area))
call cairo_set_source_surface(cr, isurface, 0._c_double, 0._c_double)
call cairo_paint(cr)
call cairo_destroy(cr)
rv = FALSE
end function hl_gtk_drawing_area_expose_cb
subroutine hl_gtk_drawing_area_destroy_cb(area, data) bind(c)
type(c_ptr), value :: area, data
! Default callback for the destroy signal on the drawing area.
! Just destroys the backing surface.
! AREA: c_ptr: required: The drawing area being destroyed.
! DATA: c_ptr: required: User data for the callback (not used)
type(c_ptr) :: isurface
isurface = g_object_get_data(area, "backing-surface")
if (c_associated(isurface)) call cairo_surface_destroy(isurface)
end subroutine hl_gtk_drawing_area_destroy_cb
subroutine hl_gtk_drawing_area_resize_cb(area, data) bind(c)
type(c_ptr), value :: area, data
! Default call back for resizing the drawing area, just
! copies the old backing store to the new one
! AREA: c_ptr: required: The drawing area being destroyed.
! DATA: c_ptr: required: User data for the callback (not used)
call hl_gtk_drawing_area_resize(area, copy=.true.)
end subroutine hl_gtk_drawing_area_resize_cb
function hl_gtk_drawing_area_cairo_new(area) result(cr)
type(c_ptr) :: cr
type(c_ptr), intent(in) :: area
! Create a cairo context which will draw into the backing surface
! AREA: c_ptr: required: The drawing area to which we will draw.
! After the drawing operations, you should call `gtk_widget_queue_draw`
! to update the plot on the screen and `hl_gtk_pixbuf_cairo_destroy`
! to destroy the cairo context.
type(c_ptr) :: isurface
integer(kind=c_int) :: width, height, n_channels
type(c_ptr) :: surface
integer(kind=c_int) :: ok, cairo_type
isurface = g_object_get_data(area, "backing-surface")
if (.not. c_associated(isurface)) then
write(error_unit,*) "hl_gtk_pixbuf_cairo_new:: Backing surface is NULL"
end if
cr = cairo_create(isurface)
end function hl_gtk_drawing_area_cairo_new
subroutine hl_gtk_drawing_area_cairo_destroy(cr, destroy_surface)
type(c_ptr), intent(inout) :: cr
integer(kind=c_int), intent(in), optional :: destroy_surface
! type(cairo_user_data_key_t), intent(in), target :: key
! Update the backing surface and destroy the cairo context
! CR: c_ptr: required: The cairo context to put in the pixbuf
! DESTROY_SURFACE: boolean : optional: Set to TRUE to destroy the
! cairo_surface as well as the context. Normally the cairo
! surface is destroyed by the destroy callback of the drawing
! area, so does not need to be explicitly destroyed.
! This is called following drawing operations to the context created by
! `hl_gtk_drawing_area_cairo_new`. N.B. This does not update the window,
! use gtk_widget_queue_draw to do that.
integer(kind=c_int) :: width, height
type(c_ptr) :: isurface
if (present(destroy_surface)) then
if (destroy_surface == TRUE) then
! Get the cairo surface and destroy it
isurface = cairo_get_target(cr)
call cairo_surface_destroy(isurface)
end if
end if
call cairo_destroy(cr)
end subroutine hl_gtk_drawing_area_cairo_destroy
subroutine hl_gtk_drawing_area_resize(area, size, copy)
type(c_ptr), intent(in) :: area
integer(kind=c_int), intent(in), optional, dimension(2) :: size
logical, optional, intent(in) :: copy
! Resize a drawing area and its backing store.
! AREA: c_ptr: required: The area to resize.
! SIZE: int(2) : optional: The new size, if omitted, then the
! backing store is resized to match the drawing area (e.g.
! after resizing the containing window).
type(c_ptr) :: cback, cback_old, cr, gdk_w
integer(kind=c_int) :: szx, szy, s_type
type(gtkallocation), target:: alloc
logical :: copy_surface
if (present(copy)) then
copy_surface = copy
copy_surface = .false.
end if
! If the SIZE keyword is present then resize the window
if (present(size)) then
call gtk_widget_set_size_request(area, size(1), size(2))
szx = size(1)
szy = size(2)
! Ensure that the allocation is up-to-date
call gtk_widget_get_allocation(area,c_loc(alloc))
szx = alloc%width
szy = alloc%height
! Get the backing store and make a new one with the right type. Then
! make that into the backing store.
cback_old = g_object_get_data(area, "backing-surface")
s_type = cairo_surface_get_type(cback_old)
cback = cairo_image_surface_create(s_type, szx, szy)
cback = cairo_surface_reference(cback) ! Prevent accidental deletion
call g_object_set_data(area, "backing-surface", cback)
! If the copy keyword is set then make a copy from the old
! backing store to the new if the gdk window is really there.
if (copy_surface) then
gdk_w = gtk_widget_get_window(area)
if (c_associated(gdk_w)) then
cr = cairo_create(cback)
call cairo_set_source_surface(cr, cback_old, &
& 0._c_double, 0._c_double)
call cairo_paint(cr)
call cairo_destroy(cr)
end if
end if
! Ensure that the old backing store is fully dereferenced.
if (cairo_surface_get_reference_count(cback_old) <= 0) exit
call cairo_surface_destroy(cback_old)
end do
end subroutine hl_gtk_drawing_area_resize
! These routines are obsolete, but are retained for the time being to
! let older codes work
function hl_gtk_pixbuf_cairo_new(area, key) result(cr)
type(c_ptr) :: cr
type(c_ptr), intent(in) :: area
type(cairo_user_data_key_t), intent(in), target :: key
write(error_unit,*) "hl_gtk_pixbuf_cairo_new(area, key) is deprecated,"
write(error_unit,*) "use hl_gtk_drawing_area_cairo_new(area) instead"
cr = hl_gtk_drawing_area_cairo_new(area)
end function hl_gtk_pixbuf_cairo_new
subroutine hl_gtk_pixbuf_cairo_destroy(cr, key)
type(c_ptr), intent(inout) :: cr
type(cairo_user_data_key_t), intent(in), target :: key
write(error_unit,*) "hl_gtk_pixbuf_cairo_destroy(area, key) is deprecated,"
write(error_unit,*) "use hl_gtk_drawing_area_cairo_destroy(area) instead"
call hl_gtk_drawing_area_cairo_destroy(cr)
end subroutine hl_gtk_pixbuf_cairo_destroy
function hl_gtk_drawing_area_get_pixbuf(area) result(isurface)
type(c_ptr) :: isurface
type(c_ptr), intent(in) :: area
write(error_unit,*) "hl_gtk_drawing_area_get_pixbuf(area) is deprecated,"
write(error_unit,*) "use hl_gtk_drawing_area_get_surface(area) instead"
isurface = hl_gtk_drawing_area_get_surface(area)
end function hl_gtk_drawing_area_get_pixbuf
end module gtk_draw_hl
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