indexing
	description: "Contains information about the type, size, and layout of a file that contains a device-independent bitmap (DIB)."
	status: "See notice at end of class."
	date: "$Date$"
	revision: "$Revision$"

class interface
	WEL_BITMAP_FILE_HEADER

create 

	make
		ensure
			type_set: type = 0
			size_set: size = 0
			reserved1_set: reserved1 = 0
			reserved2_set: reserved2 = 0
			off_bits_set: off_bits = 0

	make_by_pointer (a_pointer: POINTER)
			-- Set item with a_pointer.
			-- Since item is shared, it does not need
			-- to be freed.
			-- Caution: a_pointer must be a pointer
			-- coming from Windows.
			-- (from WEL_ANY)
		ensure -- from WEL_ANY
			item_set: item = a_pointer
			shared: shared

feature -- Access

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

	off_bits: INTEGER

	reserved1: INTEGER

	reserved2: INTEGER

	size: INTEGER

	type: INTEGER
	
feature -- Measurement

	structure_size: INTEGER
			-- Size to allocate (in bytes)
		ensure -- from WEL_STRUCTURE
			positive_result: Result > 0
	
feature -- Status report

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

	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)
	
feature -- Status setting

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

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

	set_off_bits (a_off_bits: INTEGER)
		ensure
			off_bits_set: off_bits = a_off_bits

	set_reserved1 (a_reserved1: INTEGER)
		ensure
			reserved1_set: reserved1 = a_reserved1

	set_reserved2 (a_reserved2: INTEGER)
		ensure
			reserved2_set: reserved2 = a_reserved2

	set_size (a_size: INTEGER)
		ensure
			size_set: size = a_size

	set_type (a_type: INTEGER)
		ensure
			type_set: type = a_type
	
feature -- Removal

	dispose
			-- Destroy the inner structure of Current.
			--
			-- This function should be called by the GC when the
			-- object is collected or by the user if Current is
			-- no more usefull.
			-- (from WEL_ANY)
	
feature -- Conversion

	to_integer: INTEGER
			-- Converts item to an integer.
			-- (from WEL_ANY)
		ensure -- from WEL_ANY
			Result = cwel_pointer_to_integer (item)
	
feature -- Basic operations

	initialize
			-- Fill Current with zeros.
			-- (from WEL_STRUCTURE)
		require -- from WEL_STRUCTURE
			exists: exists

	initialize_with_character (a_character: CHARACTER)
			-- Fill current with a_character.
			-- (from WEL_STRUCTURE)
		require -- from WEL_STRUCTURE
			exists: exists

	memory_copy (source_pointer: POINTER; length: INTEGER)
			-- Copy length bytes from source_pointer to item.
			-- (from WEL_STRUCTURE)
		require -- from WEL_STRUCTURE
			length_small_enough: length <= structure_size
			length_large_enough: length > 0
			exists: exists
	
invariant

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

end -- class WEL_BITMAP_FILE_HEADER