deferred class
	CAIRO_I

inherit
	EL_MEMORY_ROUTINES

	EL_OS_DEPENDENT

	CAIRO_CONSTANTS

feature -- Access

	antialias (context: POINTER): INTEGER
		require
			is_attached: is_attached (context)
		deferred
		end

	surface_data (surface: POINTER): POINTER
		require
			is_attached: is_attached (surface)
		deferred
		end

	surface_format (surface: POINTER): INTEGER
		require
			is_attached: is_attached (surface)
		deferred
		end

	version: EL_SOFTWARE_VERSION
		do
			create Result.make (version_compact.to_natural_32, 0)
		end

	version_compact: INTEGER
		deferred
		end

	windows_surface_dc (surface: POINTER): POINTER
		-- Windows surface device context or NULL if it is not a windows surface
		-- HDC cairo_win32_surface_get_dc (cairo_surface_t *surface);
		require
			ms_windows: {PLATFORM}.is_windows
			is_attached: is_attached (surface)
		deferred
		end

feature -- Measurement

	format_stride_for_width (format, width: INTEGER): INTEGER
			-- int cairo_format_stride_for_width (cairo_format_t format, int width);
		require
			valid_format: is_valid_format (format)
		deferred
		end

	surface_height (surface: POINTER): INTEGER
		require
			is_attached: is_attached (surface)
		deferred
		end

	surface_width (surface: POINTER): INTEGER
		require
			is_attached: is_attached (surface)
		deferred
		end

feature -- Status change

	matrix_init_scale (matrix: POINTER; scale_x, scale_y: DOUBLE)
		-- Initializes matrix to a transformation that scales by `scale_x', `scale_y'
		-- in the X and Y dimensions, respectively.
		deferred
		end

	surface_finish (surface: POINTER)
		require
			is_attached: is_attached (surface)
		deferred
		end

	surface_mark_dirty (surface: POINTER)
		require
			is_attached: is_attached (surface)
		deferred
		end

	reset_clip (context: POINTER)
		require
			is_attached: is_attached (context)
		deferred
		end

feature -- Factory

	new_cairo (surface: POINTER): POINTER
			-- cairo_t * cairo_create (cairo_surface_t *target);
		require
			is_attached: is_attached (surface)
		deferred
		end

	new_image_surface (format, width, height: INTEGER): POINTER
		require
			valid_format: is_valid_format (format)
		deferred
		end

	new_image_surface_from_png (png_path: POINTER): POINTER
		deferred
		end

	new_image_surface_for_data (data: POINTER; format, width, height, stride: INTEGER): POINTER
			-- cairo_surface_t * cairo_image_surface_create_for_data (
			--		unsigned char *data, cairo_format_t format, int width, int height, int stride
			-- );
		require
			valid_format: is_valid_format (format)
		deferred
		end

	new_path (context: POINTER)
		require
			is_attached: is_attached (context)
		deferred
		end

	new_pattern_for_surface (surface: POINTER): POINTER
		require
			is_attached: is_attached (surface)
		deferred
		end

	new_win32_surface_create (hdc: POINTER): POINTER
		require
			ms_windows: {PLATFORM}.is_windows
			is_attached: is_attached (hdc)
		deferred
		end

	new_win32_surface_create_with_format (hdc: POINTER; format: INTEGER): POINTER
		require
			ms_windows: {PLATFORM}.is_windows
			is_attached: is_attached (hdc)
			valid_version: version_compact >= 1_14_00
			valid_format: is_valid_format (format)
		deferred
		end

feature -- Element change

	select_font_face (context, family_utf8: POINTER; slant, weight: INTEGER)
			-- cairo_public void cairo_select_font_face (
			--		cairo_t *cr, const char *family, cairo_font_slant_t slant, cairo_font_weight_t weight
			-- );
		require
			is_attached: is_attached (context)
		deferred
		end

	set_antialias (context: POINTER; a_antialias: INTEGER)
		require
			is_attached: is_attached (context)
		deferred
		end

	set_font_size (context: POINTER; size: DOUBLE)
		-- void cairo_set_font_size (cairo_t *cr, double size);
		require
			is_attached: is_attached (context)
		deferred
		end

	set_line_width (context: POINTER; size: DOUBLE)
		require
			is_attached: is_attached (context)
		deferred
		end

	set_pattern_filter (pattern: POINTER; filter: INTEGER)
		-- void cairo_pattern_set_filter (cairo_pattern_t *pattern, cairo_filter_t filter);
		require
			pattern_attached: is_attached (pattern)
			valid_filter: is_valid_filter (filter)
		deferred
		end

	set_pattern_matrix (pattern, matrix: POINTER)
		-- Sets the pattern's transformation matrix to matrix
		-- void cairo_pattern_set_matrix (cairo_pattern_t *pattern, const cairo_matrix_t *matrix);
		require
			args_attached: is_attached (pattern) and is_attached (matrix)
		deferred
		end

	set_source (context, pattern: POINTER)
			-- void cairo_set_source (cairo_t *cr, cairo_pattern_t *source);
		require
			is_attached: is_attached (context) and is_attached (pattern)
		deferred
		end

	set_source_rgb (context: POINTER; red, green, blue: DOUBLE)
			-- void cairo_set_source_rgb (cairo_t *cr, double red, double green, double blue);
		require
			context_attached: is_attached (context)
		deferred
		end

	set_source_rgba (context: POINTER; red, green, blue, alpha: DOUBLE)
			-- void cairo_set_source_rgb (cairo_t *cr, double red, double green, double blue);
		require
			is_attached: is_attached (context)
		deferred
		end

	set_source_surface (context, surface: POINTER; x, y: DOUBLE)
		require
			context_attached: is_attached (context)
			surface_attached: is_attached (surface)
		deferred
		end

feature -- Transformations

	rotate (context: POINTER; angle: DOUBLE)
			-- void cairo_rotate (cairo_t *cr, double angle);
		require
			is_attached: is_attached (context)
		deferred
		end

	scale (context: POINTER; sx, sy: DOUBLE)
		-- void cairo_scale (cairo_t *cr, double sx, double sy);
		require
			is_attached: is_attached (context)
		deferred
		end

	translate (context: POINTER; tx, ty: DOUBLE)
		require
			context_attached: is_attached (context)
		deferred
		end

feature -- Commands

	arc (context: POINTER; xc, yc, radius, angle1, angle2: DOUBLE)
		require
			context_attached: is_attached (context)
		deferred
		end

	clip (context: POINTER)
		require
			context_attached: is_attached (context)
		deferred
		end

	close_sub_path (context: POINTER)
		require
			context_attached: is_attached (context)
		deferred
		end

	define_sub_path (context: POINTER)
		require
			context_attached: is_attached (context)
		deferred
		end

	fill (context: POINTER)
		require
			context_attached: is_attached (context)
		deferred
		end

	line_to (context: POINTER; x, y: DOUBLE)
		require
			is_attached: is_attached (context)
		deferred
		end

	mask_surface (context, surface: POINTER; x, y: DOUBLE)
		require
			is_context_attached: is_attached (context)
			is_surface_attached: is_attached (surface)
		deferred
		end

	move_to (context: POINTER; x, y: DOUBLE)
			-- void cairo_move_to (cairo_t *cr, double x, double y);
		require
			is_attached: is_attached (context)
		deferred
		end

	paint (context: POINTER)
		require
			is_attached: is_attached (context)
		deferred
		end

	paint_with_alpha (context: POINTER; alpha: DOUBLE)
		require
			is_attached: is_attached (context)
		deferred
		end

	restore (context: POINTER)
			-- void cairo_restore (cairo_t *cr);
		require
			is_attached: is_attached (context)
		deferred
		end

	rectangle (context: POINTER; x, y, width, height: DOUBLE)
		require
			is_attached: is_attached (context)
		deferred
		end

	save (context: POINTER)
			-- void cairo_save (cairo_t *cr);
		require
			is_attached: is_attached (context)
		deferred
		end

	stroke (context: POINTER)
		require
			is_attached: is_attached (context)
		deferred
		end

	surface_flush (surface: POINTER)
			-- void cairo_surface_flush (cairo_surface_t *surface);
		require
			is_attached: is_attached (surface)
		deferred
		end

	show_text (context, text_utf8: POINTER)
			-- void cairo_show_text (cairo_t *cr, const char *utf8);
		require
			is_attached: is_attached (context)
		deferred
		end

feature -- Memory release

	destroy (context: POINTER)
			-- void cairo_destroy (cairo_t *cr);
		require
			is_attached: is_attached (context)
		deferred
		end

	destroy_pattern (pattern: POINTER)
			-- void cairo_pattern_destroy (cairo_pattern_t *pattern);
		require
			is_attached: is_attached (pattern)
		deferred
		end

	destroy_surface (surface: POINTER)
			-- void cairo_surface_destroy (cairo_surface_t *surface);
		require
			is_attached: is_attached (surface)
		deferred
		end

end