    indexing
    	description: "Memory device context compatible with a given device context."
    	legal: "See notice at end of class."
    	status: "See notice at end of class."
    	date: "$Date: 2006-01-22 18:25:44 -0800 (Sun, 22 Jan 2006) $"
    	revision: "$Revision: 56675 $"

    class interface
    	WEL_COMPATIBLE_DC

    create
    	make (a_dc: WEL_DC)
    			-- Make a compatible dc with `a_dc'
    		require
    			a_dc_not: a_dc /= Void
    			a_dc_exists: a_dc.exists
    		ensure
    			exists: exists

    feature -- Access

    	bitmap: WEL_BITMAP
    			-- Current bitmap selected.
    			-- (from WEL_DC)

    	brush: WEL_BRUSH
    			-- Current brush selected.
    			-- (from WEL_DC)

    	font: WEL_FONT
    			-- Current font selected.
    			-- (from WEL_DC)

    	generating_type: STRING_8
    			-- Name of current object's generating type
    			-- (type of which it is a direct instance)
    			-- (from ANY)

    	generator: STRING_8
    			-- Name of current object's generating class
    			-- (base class of the type of which it is a direct instance)
    			-- (from ANY)

    	item: POINTER
    			-- Generic Windows handle or structure pointer.
    			-- Can be a HWND, HICON, RECT *, WNDCLASS *, etc...
    			-- (from WEL_ANY)

    	palette: WEL_PALETTE
    			-- Current palette selected.
    			-- (from WEL_DC)

    	pen: WEL_PEN
    			-- Current pen selected.
    			-- (from WEL_DC)

    	region: WEL_REGION
    			-- Current region selected.
    			-- (from WEL_DC)

    feature -- Comparison

    	frozen deep_equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void
    			-- or attached to isomorphic object structures?
    			-- (from ANY)
    		ensure -- from ANY
    			shallow_implies_deep: standard_equal (some, other) implies Result
    			both_or_none_void: (some = Void) implies (Result = (other = Void))
    			same_type: (Result and (some /= Void)) implies some.same_type (other)
    			symmetric: Result implies deep_equal (other, some)

    	frozen equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void or attached
    			-- to objects considered equal?
    			-- (from ANY)
    		ensure -- from ANY
    			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.is_equal (other))

    	is_equal (other: like Current): BOOLEAN
    			-- Is `other' attached to an object considered
    			-- equal to current object?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			symmetric: Result implies other.is_equal (Current)
    			consistent: standard_is_equal (other) implies Result

    	frozen standard_equal (some: ANY; other: like arg #1): BOOLEAN
    			-- Are `some' and `other' either both void or attached to
    			-- field-by-field identical objects of the same type?
    			-- Always uses default object comparison criterion.
    			-- (from ANY)
    		ensure -- from ANY
    			definition: Result = (some = Void and other = Void) or else ((some /= Void and other /= Void) and then some.standard_is_equal (other))

    	frozen standard_is_equal (other: like Current): BOOLEAN
    			-- Is `other' attached to an object of the same type
    			-- as current object, and field-by-field identical to it?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			same_type: Result implies same_type (other)
    			symmetric: Result implies other.standard_is_equal (Current)

    feature -- Status report

    	background_color: WEL_COLOR_REF
    			-- Current color of the background.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void

    	bitmap_selected: BOOLEAN
    			-- Is a bitmap selected?
    			-- (from WEL_DC)

    	brush_selected: BOOLEAN
    			-- Is a brush selected?
    			-- (from WEL_DC)

    	char_abc_widths (first_char_index, last_char_index: NATURAL_32): ARRAYED_LIST [WEL_ABC_STRUCT]
    			-- `Result' is a list of Windows ABC structures corresponding to the currently
    			-- selected truetype font, with an entry for each character contained within the
    			-- indices `first_char_index', `last_char_index'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			indexes_valid: first_char_index >= 1 and last_char_index >= first_char_index
    			valid_range: (last_char_index - first_char_index) <= {INTEGER_32}.max_value.to_natural_32
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void

    	character_size (c: CHARACTER_8): WEL_SIZE
    			-- Size of the string `s' using the selected font.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			result_exists: Result /= Void
    			positive_width: Result.width >= 0
    			positive_height: Result.height >= 0

    	conforms_to (other: ANY): BOOLEAN
    			-- Does type of current object conform to type
    			-- of `other' (as per Eiffel: The Language, chapter 13)?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void

    	device_caps (capability: INTEGER_32): INTEGER_32
    			-- Give device-specific information about
    			-- the current display device.
    			-- See class WEL_CAPABILITIES_CONSTANTS for
    			-- `capability' values and results.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	exists: BOOLEAN
    			-- Does the item exist?
    			-- (from WEL_ANY)
    		require -- from  WEL_REFERENCE_TRACKABLE
    			True
    		ensure -- from WEL_ANY
    			Result = (item /= default_pointer)

    	font_selected: BOOLEAN
    			-- Is a font selected?
    			-- (from WEL_DC)

    	height: INTEGER_32
    			-- Height of screen (in raster lines).
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	is_opaque: BOOLEAN
    			-- Is the background mode opaque?
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	is_transparent: BOOLEAN
    			-- Is the background mode transparent?
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	map_mode: INTEGER_32
    			-- Current mapping mode
    			-- See class WEL_MM_CONSTANTS for values.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			valid_map_mode: valid_map_mode_constant (Result)

    	mask_blt_supported: BOOLEAN
    			-- (from WEL_DC)

    	palette_selected: BOOLEAN
    			-- Is a palette selected?
    			-- (from WEL_DC)

    	pen_selected: BOOLEAN
    			-- Is a pen selected?
    			-- (from WEL_DC)

    	pixel_color (x, y: INTEGER_32): WEL_COLOR_REF
    			-- Color located at `x', `y' position.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void

    	polygon_fill_mode: INTEGER_32
    			-- Current polygon fill mode
    			-- See class WEL_POLYGON_FILL_MODE_CONSTANTS for values.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			valid_polygon_fill_mode: valid_polygon_fill_mode_constant (Result)

    	position: WEL_POINT
    			-- Current position in logical coordinates.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			result_exists: Result /= Void

    	region_selected: BOOLEAN
    			-- Is a region selected?
    			-- (from WEL_DC)

    	rop2: INTEGER_32
    			-- Current drawing mode.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			valid_result: valid_rop2_constant (Result)

    	same_type (other: ANY): BOOLEAN
    			-- Is type of current object identical to type of `other'?
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			definition: Result = (conforms_to (other) and other.conforms_to (Current))

    	shared: BOOLEAN
    			-- Is item shared by another object?
    			-- If False (by default), item will
    			-- be destroyed by destroy_item.
    			-- If True, item will not be destroyed.
    			-- (from WEL_ANY)

    	stretch_blt_mode: INTEGER_32
    			-- Current stretching mode. The stretching mode
    			-- defines how color data is added to or removed from
    			-- bitmaps that are stretched or compressed when
    			-- stretch_blt is called.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			valid_stretch_mode: valid_stretch_mode_constant (Result)

    	string_height (s: STRING_GENERAL): INTEGER_32
    			-- Height of the string `s' using the selected font.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			s_exists: s /= Void
    		ensure -- from WEL_DC
    			positive_result: Result >= 0

    	string_size (s: STRING_GENERAL): WEL_SIZE
    			-- Size of the string `s' using the selected font.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			s_exists: s /= Void
    		ensure -- from WEL_DC
    			result_exists: Result /= Void
    			positive_width: Result.width >= 0
    			positive_height: Result.height >= 0

    	string_width (s: STRING_GENERAL): INTEGER_32
    			-- Width of the string `s' using the selected font.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			s_exists: s /= Void
    		ensure -- from WEL_DC
    			positive_result: Result >= 0

    	tabbed_text_height (text: STRING_GENERAL): INTEGER_32
    			-- Height of a tabbed `text'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			text_not_void: text /= Void
    		ensure -- from WEL_DC
    			positive_height: Result >= 0

    	tabbed_text_size (text: STRING_GENERAL): WEL_SIZE
    			-- Size of a tabbed `text'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			text_not_void: text /= Void
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void
    			positive_width: Result.width >= 0
    			positive_height: Result.height >= 0

    	tabbed_text_size_with_tabulation (text: STRING_GENERAL; tabulations: ARRAY [INTEGER_32]): WEL_SIZE
    			-- Size of a tabbed `text', with `tabulations' as
    			-- tabulation positions.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			text_not_void: text /= Void
    			tabulations_not_void: tabulations /= Void
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void
    			positive_width: Result.width >= 0
    			positive_height: Result.height >= 0

    	tabbed_text_width (text: STRING_GENERAL): INTEGER_32
    			-- Width of a tabbed `text'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			text_not_void: text /= Void
    		ensure -- from WEL_DC
    			positive_width: Result >= 0

    	text_alignment: INTEGER_32
    			-- Current text alignment flags.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	text_color: WEL_COLOR_REF
    			-- Current color of the text.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void

    	text_face: STRING_GENERAL
    			-- Typeface name of the font that is currently selected.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void

    	valid_extent_map_mode (mode: INTEGER_32): BOOLEAN
    			-- Is `mode' a valid window or viewport extent map mode?
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			valid_map_mode: valid_map_mode_constant (mode)

    	viewport_extent: WEL_SIZE
    			-- Retrieve the size of the current viewport for the dc.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void

    	viewport_origin: WEL_POINT
    			-- Viewport origin for the dc.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void

    	width: INTEGER_32
    			-- Width of the screen (in pixels).
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	window_extent: WEL_SIZE
    			-- Window extent for the dc
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void

    	window_origin: WEL_POINT
    			-- Window origin for the dc.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void

    feature {ANY} -- Status report

    	valid_dib_colors_constant (c: INTEGER_32): BOOLEAN
    			-- Is `c' a valid dib colors constant?
    			-- (from WEL_DIB_COLORS_CONSTANTS)

    	valid_htext_alignment_constant (c: INTEGER_32): BOOLEAN
    			-- Is `c' a valid text alignment constant for horizontal positioning?
    			-- (from WEL_TA_CONSTANTS)

    	valid_map_mode_constant (c: INTEGER_32): BOOLEAN
    			-- Is `c' a valid map mode constant?
    			-- (from WEL_MM_CONSTANTS)

    	valid_polygon_fill_mode_constant (c: INTEGER_32): BOOLEAN
    			-- Is `c' a valid polygon fill mode constant?
    			-- (from WEL_POLYGON_FILL_MODE_CONSTANTS)

    	valid_rop2_constant (c: INTEGER_32): BOOLEAN
    			-- Is `c' a valid rop2 constant?
    			-- (from WEL_DRAWING_CONSTANTS)

    	valid_stretch_mode_constant (c: INTEGER_32): BOOLEAN
    			-- Is `c' a valid stretch mode constant?
    			-- (from WEL_STRETCH_MODE_CONSTANTS)

    	valid_text_alignment_constant (c: INTEGER_32): BOOLEAN
    			-- Is `c' a valid text alignment constant?
    			-- (from WEL_TA_CONSTANTS)

    	valid_vtext_alignment_constant (c: INTEGER_32): BOOLEAN
    			-- Is `c' a valid text alignment constant for vertical positioning?
    			-- (from WEL_TA_CONSTANTS)

    feature -- Status setting

    	select_bitmap (a_bitmap: WEL_BITMAP)
    			-- Select the `a_bitmap' as the current bitmap.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_bitmap_not_void: a_bitmap /= Void
    			a_bitmap_exists: a_bitmap.exists
    		ensure -- from WEL_DC
    			bitmap_set: bitmap = a_bitmap
    			bitmap_selected: bitmap_selected

    	select_brush (a_brush: WEL_BRUSH)
    			-- Select the `a_brush' as the current brush.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_brush_not_void: a_brush /= Void
    			a_brush_exists: a_brush.exists
    		ensure -- from WEL_DC
    			brush_set: brush = a_brush
    			brush_selected: brush_selected

    	select_font (a_font: WEL_FONT)
    			-- Select the `a_font' as the current font.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_font_not_void: a_font /= Void
    			a_font_exists: a_font.exists
    		ensure -- from WEL_DC
    			font_set: font = a_font
    			font_selected: font_selected

    	select_palette (a_palette: WEL_PALETTE)
    			-- Select the `a_palette' as the current palette.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_palette_not_void: a_palette /= Void
    			a_palette_exists: a_palette.exists

    	select_pen (a_pen: WEL_PEN)
    			-- Select the `a_pen' as the current pen.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_pen_not_void: a_pen /= Void
    			a_pen_exists: a_pen.exists
    		ensure -- from WEL_DC
    			pen_set: pen = a_pen
    			pen_selected: pen_selected

    	select_region (a_region: WEL_REGION)
    			-- Select the `a_region' as the current region.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_region_not_void: a_region /= Void
    			a_region_exists: a_region.exists
    		ensure -- from WEL_DC
    			region_set: region = a_region
    			region_selected: region_selected

    	set_background_color (color: WEL_COLOR_REF)
    			-- Set the background_color to `color'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			color_not_void: color /= Void
    		ensure -- from WEL_DC
    			color_set: background_color.item = color.item

    	set_background_opaque
    			-- Set the background mode to opaque.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			is_opaque: is_opaque

    	set_background_transparent
    			-- Set the background mode to transparent.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			is_transparent: is_transparent

    	set_di_bits (a_bitmap: WEL_BITMAP; start_scan, scan_lines: INTEGER_32; bits: ARRAY [CHARACTER_8]; bitmap_info: WEL_BITMAP_INFO; usage: INTEGER_32): INTEGER_32
    			-- Set device-independent bits of `a_bitmap'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_bitmap_not_void: a_bitmap /= Void
    			a_bitmap_exists: a_bitmap.exists
    			positive_start_scan: start_scan >= 0
    			positive_scan_lines: scan_lines >= 0
    			bitmap_info_not_void: bitmap_info /= Void
    			valid_usage: valid_dib_colors_constant (usage)

    	set_hv_text_alignment (h, v: INTEGER_32)
    			-- Set the text alignment using the horizontal and
    			-- vertical components in `h' and `v'.
    			-- See class WEL_TA_CONSTANTS for valid alignments.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			valid_horizontal_alignment: valid_htext_alignment_constant (h)
    			valid_vertical_alignment: valid_vtext_alignment_constant (v)
    		ensure -- from WEL_DC
    			text_alignments_set: flag_set (text_alignment, h) and flag_set (text_alignment, v)

    	set_map_mode (mode: INTEGER_32)
    			-- Set the mapping mode `mode' of the device context.
    			-- See class WEL_MM_CONSTANTS for `mode' values.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			valid_map_mode: valid_map_mode_constant (mode)
    		ensure -- from WEL_DC
    			map_mode_set: map_mode = mode

    	set_polygon_fill_mode (mode: INTEGER_32)
    			-- Set the polygon fill mode polygon_fill_mode with
    			-- `mode'.
    			-- See class WEL_POLYGON_FILL_MODE_CONSTANTS for
    			-- `mode' values.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			valid_polygon_fill_mode: valid_polygon_fill_mode_constant (mode)
    		ensure -- from WEL_DC
    			polygon_fill_mode_set: polygon_fill_mode = mode

    	set_rop2 (a_rop2: INTEGER_32)
    			-- Set the current foreground mix mode. GDI uses the
    			-- foreground mix mode to combine pens and interiors of
    			-- filled objects with the colors already on the screen.
    			-- The foreground mix mode defines how colors from the
    			-- brush or pen and the colors in the existing image
    			-- are to be combined.
    			-- For `a_rop2' values, see class WEL_ROP2_CONSTANTS.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			valid_rop2_constant: valid_rop2_constant (a_rop2)
    		ensure -- from WEL_DC
    			rop2_set: rop2 = a_rop2

    	set_shared
    			-- Set shared to True.
    			-- (from WEL_ANY)
    		ensure -- from WEL_ANY
    			shared: shared

    	set_stretch_blt_mode (a_mode: INTEGER_32)
    			-- Set the bitmap stretching mode with `a_mode'.
    			-- See class WEL_STRETCH_MODE_CONSTANTS for `a_mode'
    			-- values.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			valid_stretch_mode_constant: valid_stretch_mode_constant (a_mode)
    		ensure -- from WEL_DC
    			stretch_blt_mode_set: stretch_blt_mode = a_mode

    	set_text_alignment (an_alignment: INTEGER_32)
    			-- Set the text alignment with `an_alignment'.
    			-- See class WEL_TA_CONSTANTS for `an_alignment'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			valid_alignment: valid_text_alignment_constant (an_alignment)
    		ensure -- from WEL_DC
    			text_alignment_set: flag_set (text_alignment, an_alignment)

    	set_text_color (color: WEL_COLOR_REF)
    			-- Set the text_color to `color'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			color_not_void: color /= Void
    		ensure -- from WEL_DC
    			color_set: text_color.item = color.item

    	set_unshared
    			-- Set shared to False.
    			-- (from WEL_ANY)
    		ensure -- from WEL_ANY
    			unshared: not shared

    	set_viewport_extent (x_extent, y_extent: INTEGER_32)
    			-- Set the `x_extent' and `y_extent' of the viewport
    			-- associated with the device context.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			valid_current_map_mode: valid_extent_map_mode (map_mode)
    		ensure -- from WEL_DC
    			x_viewport_extent_set: map_mode /= mm_isotropic implies viewport_extent.width = x_extent
    			y_viewport_extent_set: map_mode /= mm_isotropic implies viewport_extent.height = y_extent

    	set_viewport_origin (x_origin, y_origin: INTEGER_32)
    			-- Set the `x_origin' and `y_origin' of the viewport
    			-- associated with the device context.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			x_viewport_origin_set: viewport_origin.x = x_origin
    			y_viewport_origin_set: viewport_origin.y = y_origin

    	set_window_extent (x_extent, y_extent: INTEGER_32)
    			-- Set the `x_extent' and `y_extent' of the window
    			-- associated with the device context.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			valid_current_map_mode: valid_extent_map_mode (map_mode)
    		ensure -- from WEL_DC
    			x_window_extent_set: map_mode /= mm_isotropic implies window_extent.width = x_extent
    			y_window_extent_set: map_mode /= mm_isotropic implies window_extent.height = y_extent

    	set_window_origin (x_origin, y_origin: INTEGER_32)
    			-- Set the `x_origin' and `y_origin' of the window
    			-- associated with the device context
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			x_window_origin_set: window_origin.x = x_origin
    			y_window_origin_set: window_origin.y = y_origin

    	unselect_all
    			-- Deselect all objects and restore the old ones.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    		ensure -- from WEL_DC
    			pen_not_selected: not pen_selected
    			brush_not_selected: not brush_selected
    			region_not_selected: not region_selected
    			palette_not_selected: not palette_selected
    			font_not_selected: not font_selected
    			bitmap_not_selected: not bitmap_selected

    	unselect_bitmap
    			-- Deselect the bitmap and restore the old one.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			bitmap_selected: bitmap_selected
    		ensure -- from WEL_DC
    			bitmap_not_selected: not bitmap_selected

    	unselect_brush
    			-- Deselect the brush and restore the old one.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			brush_selected: brush_selected
    		ensure -- from WEL_DC
    			brush_not_selected: not brush_selected

    	unselect_font
    			-- Deselect the font and restore the old one.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			font_selected: font_selected
    		ensure -- from WEL_DC
    			font_not_selected: not font_selected

    	unselect_palette
    			-- Deselect the palette and restore the old one.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			palette_selected: palette_selected
    		ensure -- from WEL_DC
    			palette_not_selected: not palette_selected

    	unselect_pen
    			-- Deselect the pen and restore the old one.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			pen_selected: pen_selected
    		ensure -- from WEL_DC
    			pen_not_selected: not pen_selected

    	unselect_region
    			-- Deselect the region and restore the old one.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			region_selected: region_selected
    		ensure -- from WEL_DC
    			region_not_selected: not region_selected

    feature -- Element change

    	set_item (an_item: POINTER)
    			-- Set item with `an_item'
    			-- (from WEL_ANY)
    		ensure -- from WEL_ANY
    			item_set: item = an_item

    feature -- Removal

    	delete
    			-- Destroy inner structure of `Current'.
    			-- To be called when Current is no more needed
    			-- (from WEL_REFERENCE_TRACKABLE)
    		require -- from WEL_REFERENCE_TRACKABLE
    			reference_not_tracked: not reference_tracked
    		ensure -- from WEL_REFERENCE_TRACKABLE
    			destroyed: not shared implies not exists

    	dispose
    			-- Destroy inner structure of `Current'.
    			-- (from WEL_REFERENCE_TRACKABLE)
    		require -- from  DISPOSABLE
    			True
    		ensure then -- from WEL_REFERENCE_TRACKABLE
    			internal_object_id_freed: internal_object_id = 0

    feature -- Duplication

    	copy (other: like Current)
    			-- Update current object using fields of object attached
    			-- to `other', so as to yield equal objects.
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    			type_identity: same_type (other)
    		ensure -- from ANY
    			is_equal: is_equal (other)

    	frozen deep_copy (other: like Current)
    			-- Effect equivalent to that of:
    			--		copy (`other' . deep_twin)
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    		ensure -- from ANY
    			deep_equal: deep_equal (Current, other)

    	frozen deep_twin: like Current
    			-- New object structure recursively duplicated from Current.
    			-- (from ANY)
    		ensure -- from ANY
    			deep_equal: deep_equal (Current, Result)

    	frozen standard_copy (other: like Current)
    			-- Copy every field of `other' onto corresponding field
    			-- of current object.
    			-- (from ANY)
    		require -- from ANY
    			other_not_void: other /= Void
    			type_identity: same_type (other)
    		ensure -- from ANY
    			is_standard_equal: standard_is_equal (other)

    	frozen standard_twin: like Current
    			-- New object field-by-field identical to `other'.
    			-- Always uses default copying semantics.
    			-- (from ANY)
    		ensure -- from ANY
    			standard_twin_not_void: Result /= Void
    			equal: standard_equal (Result, Current)

    	frozen twin: like Current
    			-- New object equal to `Current'
    			-- twin calls copy; to change copying/twining semantics, redefine copy.
    			-- (from ANY)
    		ensure -- from ANY
    			twin_not_void: Result /= Void
    			is_equal: Result.is_equal (Current)

    feature -- Basic operations

    	alpha_blend (a_x_dest, a_y_dest, a_width, a_height: INTEGER_32; a_dc_src: WEL_DC; a_x_src, a_y_src, a_width_src, a_height_src: INTEGER_32; a_blend_function: WEL_BLEND_FUNCTION): BOOLEAN
    			-- Per pixel alpha blend.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	arc (left, top, right, bottom, x_start_arc, y_start_arc, x_end_arc, y_end_arc: INTEGER_32)
    			-- Draw an elliptical arc into a rectangle specified
    			-- by `left', `top' and `right', `bottom', starting
    			-- at `x_start_arc', `y_start_arc' and ending at
    			-- `x_end_arc', `y_end_arc'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	bit_blt (x_destination, y_destination, a_width, a_height: INTEGER_32; dc_source: WEL_DC; x_source, y_source, raster_operation: INTEGER_32)
    			-- Copy a bitmap from the `dc_source' to
    			-- the current device context, from `x_source',
    			-- `y_source' to `x_destination', `y_destination',
    			-- using `a_width' and `a_height' with `raster_operation'.
    			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for
    			-- `raster_operation' values.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			positive_width: a_width >= 0
    			positive_height: a_height >= 0
    			dc_source_not_void: dc_source /= Void
    			dc_source_exists: dc_source.exists

    	chord (left, top, right, bottom, x_start_line, y_start_line, x_end_line, y_end_line: INTEGER_32)
    			-- Draw a chord into a rectangle specified
    			-- by `left', `top' and `right', `bottom', starting
    			-- at `x_start_line', `y_start_line' and ending at
    			-- `x_end_line', `y_end_line'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	copy_dc (dc_source: WEL_DC; rect: WEL_RECT)
    			-- Copy the content of `rect' in `dc_source'
    			-- to the current dc.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			rect_not_void: rect /= Void
    			dc_source_not_void: dc_source /= Void
    			dc_source_exists: dc_source.exists

    	frozen default: like Current
    			-- Default value of object's type
    			-- (from ANY)

    	frozen default_pointer: POINTER
    			-- Default value of type `POINTER'
    			-- (Avoid the need to write `p'.default for
    			-- some `p' of type `POINTER'.)
    			-- (from ANY)

    	default_rescue
    			-- Process exception for routines with no Rescue clause.
    			-- (Default: do nothing.)
    			-- (from ANY)

    	di_bits (a_bitmap: WEL_BITMAP; start_scan, scan_lines: INTEGER_32; bitmap_info: WEL_BITMAP_INFO; usage: INTEGER_32): ARRAY [CHARACTER_8]
    			-- Device-independent bits of `a_bitmap'.
    			-- `start_scan' specifies the first scan line to
    			-- retrieve and `scan_lines' specifies the number of
    			-- scan lines to retrieve. `bitmap_info' specifies the
    			-- desired format for the dib data.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_bitmap_not_void: a_bitmap /= Void
    			a_bitmap_exists: a_bitmap.exists
    			positive_start_scan: start_scan >= 0
    			positive_scan_lines: scan_lines >= 0
    			bitmap_info_not_void: bitmap_info /= Void
    			valid_usage: valid_dib_colors_constant (usage)
    		ensure -- from WEL_DC
    			result_not_void: Result /= Void
    			consistent_count: Result.count = bitmap_info.header.size_image

    	frozen do_nothing
    			-- Execute a null action.
    			-- (from ANY)

    	draw_bitmap (a_bitmap: WEL_BITMAP; x, y, a_width, a_height: INTEGER_32)
    			-- Draw bitmap at the `x', `y' position
    			-- using `a_width' and `a_height'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_bitmap_not_void: a_bitmap /= Void
    			a_bitmap_exists: a_bitmap.exists

    	draw_bitmap_with_raster_operation (a_bitmap: WEL_BITMAP; x, y, a_width, a_height, raster_operation: INTEGER_32)
    			-- Draw bitmap using `raster_operation' at position `x', `y'
    			-- using `a_width' and `a_height'.
    			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for `raster_operation' values.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_bitmap_not_void: a_bitmap /= Void
    			a_bitmap_exists: a_bitmap.exists

    	draw_centered_text (string: STRING_GENERAL; rect: WEL_RECT)
    			-- Draw the text `string' centered in `rect'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			string_not_void: string /= Void
    			rect_not_void: rect /= Void

    	draw_cursor (cursor: WEL_CURSOR; x, y: INTEGER_32)
    			-- Draw `cursor' at the `x', `y' position.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			cursor_not_void: cursor /= Void
    			cursor_exists: cursor.exists

    	draw_disabled_text (string: STRING_GENERAL; rect: WEL_RECT; format: INTEGER_32)
    			-- Draw the text `string' in disabled mode inside
    			-- the `rect' using `format'
    			-- See class WEL_DT_CONSTANTS for `format' value.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			string_not_void: string /= Void
    			rect_not_void: rect /= Void

    	draw_edge (a_rect: WEL_RECT; edge_type: INTEGER_32; edge_border: INTEGER_32)
    			-- Draw one or more edges depending on `edge_type' using the borders
    			-- type `edge_border' in the bounding rectangle `a_rect'.
    			--
    			-- `edge_type' is a combination of the flags BDR_xxxx and EDGE_xxxx
    			-- as found in WEL_DRAWING_CONSTANTS.
    			--
    			-- `edge_type' is a combination of the flags BF_xxxx and EDGE_xxxx
    			-- as found in WEL_DRAWING_CONSTANTS.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			valid_rect: a_rect /= Void and then a_rect.exists

    	draw_frame_control (a_rect: WEL_RECT; control_type: INTEGER_32; control_state: INTEGER_32)
    			-- Draws a frame control of the type `control_type' with the style
    			-- `control_state'.
    			--
    			-- `control_type' is a combination of the flags DFC_xxxx
    			-- as found in WEL_DRAWING_CONSTANTS.
    			--
    			-- `control_state' is a combination of the flags DFCS_xxxx
    			-- as found in WEL_DRAWING_CONSTANTS.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			valid_rect: a_rect /= Void and then a_rect.exists

    	draw_icon (icon: WEL_ICON; x, y: INTEGER_32)
    			-- Draw `icon' at the `x', `y' position.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			icon_not_void: icon /= Void
    			icon_exists: icon.exists

    	draw_icon_ex (icon: WEL_ICON; x, y, icon_width, icon_height, frame_index: INTEGER_32; flicker_free_background: WEL_BRUSH; di_flags: INTEGER_32)
    			-- Draw `icon' at the `x', `y' position.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			icon_not_void: icon /= Void
    			icon_exists: icon.exists

    	draw_state_bitmap (a_brush: WEL_BRUSH; a_bitmap: WEL_BITMAP; x, y: INTEGER_32; format: INTEGER_32)
    			-- Draw the bitmap `a_bitmap' using `format' at the
    			-- location (`x',`y') using the brush `a_brush' if `format' include Dss_mono.
    			--
    			-- See class DSS_xxx and DST_xxx constants in WEL_DRAWING_CONSTANTS for
    			-- `format' value.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_bitmap_not_void: a_bitmap /= Void

    	draw_state_icon (a_brush: WEL_BRUSH; an_icon: WEL_GRAPHICAL_RESOURCE; x, y: INTEGER_32; format: INTEGER_32)
    			-- Draw the icon/cursor `an_icon' using `format' at the
    			-- location (`x',`y') using the brush `a_brush' if `format' include Dss_mono.
    			--
    			-- See class DSS_xxx and DST_xxx constants in WEL_DRAWING_CONSTANTS for
    			-- `format' value.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			an_icon_not_void: an_icon /= Void

    	draw_state_text (a_brush: WEL_BRUSH; string: STRING_GENERAL; x, y: INTEGER_32; format: INTEGER_32)
    			-- Draw the text `string' using `format' at the
    			-- location (`x',`y') using the brush `a_brush' if `format' include Dss_mono.
    			--
    			-- See class DSS_xxx and DST_xxx constants in WEL_DRAWING_CONSTANTS for
    			-- `format' value.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			string_not_void: string /= Void

    	draw_text (string: STRING_GENERAL; rect: WEL_RECT; format: INTEGER_32)
    			-- Draw the text `string' inside
    			-- the `rect' using `format'
    			-- See class WEL_DT_CONSTANTS for `format' value.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			string_not_void: string /= Void
    			rect_not_void: rect /= Void

    	draw_text_with_result (string: STRING_GENERAL; rect: WEL_RECT; format: INTEGER_32): INTEGER_32
    			-- Draw the text `string' inside the `rect' using `format'.
    			-- Return the height of the text drawn.
    			-- See class WEL_DT_CONSTANTS for `format' value.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			string_not_void: string /= Void
    			rect_not_void: rect /= Void

    	ellipse (left, top, right, bottom: INTEGER_32)
    			-- Draw an ellipse into a rectangle specified by
    			-- `left', `top' and `right', `bottom'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	fill_rect (a_rect: WEL_RECT; a_brush: WEL_BRUSH)
    			-- Fill a `a_rect' using `a_brush'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_rect_not_void: a_rect /= Void
    			a_brush_not_void: a_brush /= Void
    			a_brush_exists: a_brush.exists

    	fill_region (a_region: WEL_REGION; a_brush: WEL_BRUSH)
    			-- Fill `a_region' using `a_brush'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_region_not_void: a_region /= Void
    			a_brush_not_void: a_brush /= Void
    			a_brush_exists: a_brush.exists

    	flood_fill_border (x, y: INTEGER_32; color: WEL_COLOR_REF)
    			-- Fill an area which is bounded by `color' starting
    			-- at `x', `y'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			color_not_void: color /= Void

    	flood_fill_surface (x, y: INTEGER_32; color: WEL_COLOR_REF)
    			-- Fill an area which is defined by `color' starting
    			-- at `x', `y'. Filling continues outward in all
    			-- directions as long as the color is encountered.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			color_not_void: color /= Void

    	get
    			-- Get the device context

    	invert_rect (a_rect: WEL_RECT)
    			-- Invert `a_rect' in a window by performing a logical
    			-- NOT operation on the color values for each pixel.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_rect_not_void: a_rect /= Void

    	invert_region (a_region: WEL_REGION)
    			-- Invert the colors in `a_region'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_region_not_void: a_region /= Void
    			a_region_exists: a_region.exists

    	line (x1, y1, x2, y2: INTEGER_32)
    			-- Draw a line from `x1', `y1' to `x2', `y2'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	line_to (x, y: INTEGER_32)
    			-- Draw a line from the current position
    			-- to `x', `y' position.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	make_rop4 (fore, back: INTEGER_32): INTEGER_32
    			-- `Result' is raster operation code corresponding to
    			-- `fore' and `back' for argument `raster_operation' code
    			-- of mask_blt. This corresponds to Windows macro Makerop4
    			-- (from WEL_DC)

    	mask_blt (x_destination, y_destination, a_width, a_height: INTEGER_32; dc_source: WEL_DC; x_source, y_source: INTEGER_32; mask_bitmap: WEL_BITMAP; x_mask, y_mask, raster_operation: INTEGER_32)
    			-- Combines the color data for the source and destination bitmaps using the specified mask and raster operation.
    			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for
    			-- `raster_operation' values.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			positive_width: a_width >= 0
    			positive_height: a_height >= 0
    			mask_bitmap_not_void: mask_bitmap /= Void
    			function_is_supported: mask_blt_supported

    	move_to (x, y: INTEGER_32)
    			-- Set the current position to `x', `y' position.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	pat_blt (x_destination, y_destination, a_width, a_height: INTEGER_32; raster_operation: INTEGER_32)
    			-- Paint the rectangle specified by `x_destination',
    			-- `y_destination', `a_width', `a_height' using the brush
    			-- that is currently selected into this device context.
    			-- The brush color and the surface color or colors are
    			-- combined by using the `raster_operation'.
    			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for
    			-- `raster_operation' values.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			positive_width: a_width >= 0
    			positive_height: a_height >= 0

    	pie (left, top, right, bottom, x_start_point, y_start_point, x_end_point, y_end_point: INTEGER_32)
    			-- Draw a pie-shaped wedge by drawing an elliptical
    			-- arc whose center and two endpoints are joined
    			-- by lines. The pie is drawn into a rectangle
    			-- specified by `left', `top' and `right', `bottom',
    			-- starting at `x_start_point', `y_start_point'
    			-- and ending at `x_end_point', `y_end_point'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	poly_bezier (points: ARRAY [INTEGER_32])
    			-- Draw one or more Bezier curves by using the
    			-- endpoints and control points specified by `points'.
    			-- The first curve is drawn from the first point to the
    			-- fourth point by using the second and third points as
    			-- control points. Each subsequent curve in the sequence
    			-- needs exactly three more points: the ending point of
    			-- the previous curve is used as the starting point, the
    			-- next two points in the sequence are control points,
    			-- and the third is the ending point.
    			-- The current position is neither used nor updated by
    			-- this procedure.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			points_not_void: points /= Void
    			points_count_ok: points.count \\ 2 = 0

    	poly_bezier_to (points: ARRAY [INTEGER_32])
    			-- Draw one or more Bezier curves by using the control
    			-- points specified by `points'. The first curve is
    			-- drawn from the current position to the third point
    			-- by using the first two points as control points.
    			-- For each subsequent curve, the procedure needs
    			-- exactly three more points, and uses the ending point
    			-- of the previous curve as the starting point for the
    			-- next.
    			-- This procedure moves the current position to the
    			-- ending point of the last Bezier curve.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			points_not_void: points /= Void
    			points_count_ok: points.count \\ 2 = 0

    	polygon (points: ARRAY [INTEGER_32])
    			-- Draw a polygon consisting of two or more `points'
    			-- connected by lines.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			points_not_void: points /= Void
    			points_count: points.count \\ 2 = 0

    	polyline (points: ARRAY [INTEGER_32])
    			-- Draws a series of line segments by connecting the
    			-- points specified in `points'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			points_not_void: points /= Void
    			points_count: points.count \\ 2 = 0

    	realize_palette
    			-- Map palette entries from the current logical
    			-- palette on the system palette.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			palette_selected: palette_selected

    	rectangle (left, top, right, bottom: INTEGER_32)
    			-- Draw a rectangle from `left', `top'
    			-- to `right', `bottom'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	release
    			-- Release the device context

    	remove_clip_region
    			-- Remove the current clipping region.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	round_rect (left, top, right, bottom, ellipse_width, ellipse_height: INTEGER_32)
    			-- Draw a rectangle from `left', `top' to
    			-- `right', `bottom' with rounded corners.
    			-- The rounded corners are specified by the
    			-- `ellipse_width' and `ellipse_height'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists

    	save_bitmap (a_bitmap: WEL_BITMAP; file: FILE_NAME)
    			-- Save `a_bitmap' in `file'.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_bitmap_not_void: a_bitmap /= Void
    			a_bitmap_exists: a_bitmap.exists
    			file_not_void: file /= Void
    			file_is_valid: file.is_valid

    	select_clip_region (a_region: WEL_REGION)
    			-- Select `a_region' as the current clipping region.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			a_region_not_void: a_region /= Void
    			a_region_exists: a_region.exists

    	set_pixel (x, y: INTEGER_32; color: WEL_COLOR_REF)
    			-- Set the pixel at `x', `y' position.
    			-- with the `color' color.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			color_not_void: color /= Void

    	stretch_blt (x_destination, y_destination, width_destination, height_destination: INTEGER_32; dc_source: WEL_DC; x_source, y_source, width_source, height_source, raster_operation: INTEGER_32)
    			-- Copy a bitmap from the `dc_source' to
    			-- the current device context, from `x_source',
    			-- `y_source' to `x_destination', `y_destination',
    			-- using width and height with `raster_operation'.
    			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for
    			-- `raster_operation' values.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			positive_width_destination: width_destination >= 0
    			positive_height_destination: height_destination >= 0
    			positive_width_source: width_source >= 0
    			positive_height_source: height_source >= 0
    			dc_source_not_void: dc_source /= Void
    			dc_source_exists: dc_source.exists

    	stretch_di_bits (x_destination, y_destination, a_width, a_height, x_source, y_source, dib_width, dib_height: INTEGER_32; dib: WEL_DIB; bitmap_info: WEL_BITMAP_INFO; rgb_mode, raster_operation: INTEGER_32)
    			-- Copy a dib to the current device context, from
    			-- `x_source', `y_source' to `x_destination',
    			-- `y_destination', using `a_width' and `a_height'
    			-- with `raster_operation' and `rgb_mode'
    			-- See class WEL_RASTER_OPERATIONS_CONSTANTS for
    			-- `raster_operation' values
    			-- See class WEL_DIB_COLORS_CONSTANTS for
    			-- `rgb_mode' values
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			positive_width: a_width >= 0
    			positive_height: a_height >= 0
    			dib_not_void: dib /= Void
    			bitmap_not_void: bitmap_info /= Void
    			valid_rgb_mode: valid_dib_colors_constant (rgb_mode)

    	tabbed_text_out (x, y: INTEGER_32; string: STRING_GENERAL; tabulations: ARRAY [INTEGER_32]; tabulations_origin: INTEGER_32)
    			-- Write `string' on `x' and `y' position expanding
    			-- tabs to the values specified in `tabulations'.
    			-- `tabulations_origin' specifies the x-coordinate of
    			-- the starting position from which tabs are expanded.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			string_not_void: string /= Void
    			tabulations_not_void: tabulations /= Void

    	text_out (x, y: INTEGER_32; string: STRING_GENERAL)
    			-- Write `string' on `x' and `y' position.
    			-- (from WEL_DC)
    		require -- from WEL_DC
    			exists: exists
    			string_not_void: string /= Void

    feature -- Output

    	io: STD_FILES
    			-- Handle to standard file setup
    			-- (from ANY)

    	out: STRING_8
    			-- New string containing terse printable representation
    			-- of current object
    			-- Was declared in ANY as synonym of tagged_out.
    			-- (from ANY)

    	print (some: ANY)
    			-- Write terse external representation of `some'
    			-- on standard output.
    			-- (from ANY)

    	frozen tagged_out: STRING_8
    			-- New string containing terse printable representation
    			-- of current object
    			-- Was declared in ANY as synonym of out.
    			-- (from ANY)

    feature -- Platform

    	operating_environment: OPERATING_ENVIRONMENT
    			-- Objects available from the operating system
    			-- (from ANY)

    feature -- Status Report

    	reference_tracked: BOOLEAN
    			-- Are number references of `Current' tracked?
    			-- (from WEL_REFERENCE_TRACKABLE)

    	references_count: INTEGER_32
    			-- Number of object referring to current object.
    			-- (from WEL_REFERENCE_TRACKABLE)

    feature -- Status Setting

    	decrement_reference
    			-- Decrement number of references to current object.
    			-- When number of references reaches zero,
    			-- delete is called if object is not protected.
    			-- (from WEL_REFERENCE_TRACKABLE)
    		require -- from WEL_REFERENCE_TRACKABLE
    			exists: exists
    			tracking_references_started: reference_tracked

    	enable_reference_tracking
    			-- Set `references_tracked' to True.
    			-- (from WEL_REFERENCE_TRACKABLE)
    		require -- from WEL_REFERENCE_TRACKABLE
    			exists: exists
    			tracking_reference_not_started: not reference_tracked

    	increment_reference
    			-- Increment number of references to current object.
    			-- (from WEL_REFERENCE_TRACKABLE)
    		require -- from WEL_REFERENCE_TRACKABLE
    			exists: exists
    			tracking_references_started: reference_tracked

    	object_id: INTEGER_32
    			-- Runtime Id of `Current'.
    			-- (from WEL_REFERENCE_TRACKABLE)

    invariant
    		-- from WEL_DC
    	valid_background_mode: exists implies is_opaque /= is_transparent

    		-- from ANY
    	reflexive_equality: standard_is_equal (Current)
    	reflexive_conformance: conforms_to (Current)

    indexing
    	copyright: "Copyright (c) 1984-2006, Eiffel Software and others"
    	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
    	source: "[
    		Eiffel Software
    		356 Storke Road, Goleta, CA 93117 USA
    		Telephone 805-685-1006, Fax 805-685-6869
    		Website http://www.eiffel.com
    		Customer support http://support.eiffel.com
    	]"

    end -- class WEL_COMPATIBLE_DC