>>>>> On Sat, 04 Apr 2009 11:44:27 +0900, YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> said:

>> I tried making a really preliminary proof-of-concept cairo port. :-)
>> It's still rough and has several glitches/limitations, but at least
>> it can generate a "resolution-independent screenshot" PDF as
>> attached.  Maybe I'll clean up the code this weekend and hopefully
>> post a patch.

> Here's the patch for the Emacs 23.0.92 pretest (not the trunk HEAD).

> * Currently, texts, rectangles (filling and stroking), and trapezoids
>   for reliefs are drawn using cairo by hooking the corresponding
>   drawing routine calls in xterm.c.  They use X11 GC (with extension
>   data) for colors and clipping rectangles, but operations on them can
>   easily be ported to non-X11 (e.g., terminal-only) environments just
>   like the Carbon port.

> * Images could also be drawn with cairo, but I didn't do that because
>   the image drawing in xterm.c depends on X-specific data structures.
>   As a result, you can't see any images in the exported screenshot as
>   of now.

I added fringe bitmap drawing with cairo because it can be added
without using X-specific data structures.

Handa-san, could you check if the following change to ftfont.c is
correct?  It is also included in the revised patch below.

*************** ftfont_text_extents (font, code, nglyphs
*** 1255,1261 ****
  		  metrics->lbearing = m->horiBearingX >> 6;
  		  metrics->rbearing = (m->horiBearingX + m->width) >> 6;
  		  metrics->ascent = m->horiBearingY >> 6;
! 		  metrics->descent = (m->horiBearingY + m->height) >> 6;
  		}
  	      first = 0;
  	    }
--- 1255,1261 ----
  		  metrics->lbearing = m->horiBearingX >> 6;
  		  metrics->rbearing = (m->horiBearingX + m->width) >> 6;
  		  metrics->ascent = m->horiBearingY >> 6;
! 		  metrics->descent = (m->height - m->horiBearingY) >> 6;
  		}
  	      first = 0;
  	    }
*************** ftfont_text_extents (font, code, nglyphs
*** 1269,1276 ****
  		  = width + ((m->horiBearingX + m->width) >> 6);
  	      if (metrics->ascent < (m->horiBearingY >> 6))
  		metrics->ascent = m->horiBearingY >> 6;
! 	      if (metrics->descent > ((m->horiBearingY + m->height) >> 6))
! 		metrics->descent = (m->horiBearingY + m->height) >> 6;
  	    }
  	  width += m->horiAdvance >> 6;
  	}
--- 1269,1276 ----
  		  = width + ((m->horiBearingX + m->width) >> 6);
  	      if (metrics->ascent < (m->horiBearingY >> 6))
  		metrics->ascent = m->horiBearingY >> 6;
! 	      if (metrics->descent < ((m->height - m->horiBearingY) >> 6))
! 		metrics->descent = (m->height - m->horiBearingY) >> 6;
  	    }
  	  width += m->horiAdvance >> 6;
  	}

				     YAMAMOTO Mitsuharu
				mituharu@math.s.chiba-u.ac.jp