(w32_char_font_type): New enum.
(Qw32_charset_*, w32_codepage_for_font): Moved to w32fns.c.
(w32_per_char_metric): Use w32_char_font_type instead of unicode_p.
(w32_encode_char): New function.
(x_encode_char): Removed.
(x_get_glyph_and_face_encoding): Use w32_encode_char in place of
x_encode_char and w32_font_is_double_byte.
(x_produce_image_glyph): Use image_ascent.
(x_produce_glyphs): Use new version of w32_per_char_metric and
handle NULL return value. Allow extra line spacing.
(W32_TEXTOUT): Distinguish between Unicode and DBCS text.
(w32_get_glyph_overhangs): Remove unicode_p param. Use
w32_font_type member of glyph instead.
(x_draw_glyph_string): Draw underline and strike-out for BDF fonts.
(fast_find_position): Make sure not to consider rows not visible
in the window.
(w32_read_socket) [WM_MENUSELECT]: Cannot call
w32_menu_display_help with input blocked, as it can abort.
(x_display_and_set_cursor): Choose cursor depending
on buffer-local value of cursor_type.
(x_draw_bar_cursor): Add parameter WIDTH.
(VIETNAMESE_CHARSET): Define if not defined in system headers.
(Qline_spacing, Qcenter): New variables.
(Qw32_charset_*, w32_codepage_for_font): Moved from w32term.c.
(x_set_line_spacing): New function.
(x_set_frame_parameters): Use FRAME_NEW_WIDTH, FRAME_NEW_HEIGHT macros.
(x_specified_cursor_type): New function.
(x_set_cursor_type): Use it.
(x_set_name, x_set_title): Use ENCODE_SYSTEM to encode titlebar and
icon strings.
(validate_x_resource_name, x_get_resource_string): Measure lengths
of external strings in bytes.
(w32_wnd_proc) [WM_MEASURE_ITEM]: Avoid calling
GetTextExtentPoint32 with NULL title.
(Fx_create_frame): Initialize Qline_spacing.
(w32_load_system_font): Initialize font->double_byte_p.
(x_to_w32_charset): Use Vw32_charset_info_alist.
(Image, busy cursor, tooltip functions): Merged changes from
xfns.c. Not yet functional on Windows.
yet allocated, finish decoding with result
CODING_FINISH_INSUFFICIENT_CMP.
(coding_allocate_composition_data): Make it non-static.
(coding_restore_composition): Likewise.
