(Vdisplay_pixels_per_inch): New variable.
(Vshow_text_cursor_in_void): New variable. (glyph_to_pixel_coords): Don't use negative hpos. (x_y_to_hpos_vpos): Fix for partially visible first glyph. (append_stretch_glyph): Change ascent arg to be actual value in pixels rather than ratio to height. Callers changed. (calc_pixel_width_or_height): New aux function, implementing pixel based artihmetic for glyph widths and heights. (produce_stretch_glyph): Use calc_pixel_width_or_height for :width, :height, :align-to, and :ascent, thus allowing these to be specified in pixels as well as multiples of characters. Don't produce stretch glyphs with zero width or height. (get_specified_cursor_type): Declare static. (get_window_cursor_type): Declare static. Add glyph arg to be able to know when cursor is on an image; always substitute hollow-box cursor for filled-box cursor on images, to avoid negative images and flicker when blinking the cursor. (display_and_set_cursor): Pass glyph to get_window_cursor_type. (note_mode_line_or_margin_highlight): Use non-text cursor rather than vertical scroll-bar cursor in display margins. (note_mouse_highlight): Use non-text cursor rather than text cursor in fringes and over images in the text area. Use non-text cursor when mouse pointer is outside editable text, i.e. in the void after end-of-line or end-of-buffer; this was already done for W32, but is now standard for all systems -- user can toggle show-text-cursor-in-void to get old behaviour. (syms_of_xdisp): DEFVAR_LISP Vshow_text_cursor_in_void and Vdisplay_pixels_per_inch.
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