(Qcenter): New variable.
(enum image_value_type): Add IMAGE_ASCENT_VALUE. (parse_image_spec): Handle IMAGE_ASCENT_VALUE. (image_ascent): New function. (lookup_image): Recognize `:ascent center'. (xbm_format, xpm_format, pbm_format, png_format, jpeg_format) (tiff_format, gif_format, gs_format): Use IMAGE_ASCENT_VALUE. (xbm_load): Don't set image's ascent here. (xbm_image_p, xpm_image_p, pbm_image_p, png_image_p) (jpeg_image_p, tiff_image_p, gif_image_p, gs_image_p): Don't check ascent values here. (Fimagep, Flookup_image [GLYPH_DEBUG]: Removed. (syms_of_xfns) [GLYPH_DEBUG]: Don't defsubr removed functions. (syms_of_xfns): Initialize Qcenter.
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