uxa: Handle all-clipped out case with destination glyphs.

Fixes the crash reported in:

  Bug 28446 - Garbled Font with Mathematica 7
  https://bugs.freedesktop.org/show_bug.cgi?id=28446

pDst=0x3d663c0, src_x=0, src_y=0, xDst=142, yDst=112, nlist=0,
list=0x7fffea026580, glyphs=0x7fffea025d88, extents=0x0)
    at uxa-glyphs.c:809
        dx = 0
        y1 = 101
        x2 = 150
        x1 = 142
        dy = 0
        y2 = 112
        rects = 0x5491000
        this_atlas = 0x2456d00
        mask_y = 128
        glyph = 0x35933a0
        mask_x = 736
        priv = 0x39309e0
        screen = 0x8d2cc0
        uxa_screen = 0x2443eb0
        src_pixmap = 0x37c29e0
        dst_pixmap = 0x45ddbf0
        localSrc = 0x361a450
        glyph_atlas = 0x2456d00
        x = 142
        y = 112
        n = 18
        nrect = -9975128
        box = {x1 = 23152, y1 = -5630, x2 = 32767, y2 = 0}
        __PRETTY_FUNCTION__ = "uxa_glyphs_to_dst"

Though the meat of that bug regarding the incorrect remains unsolved.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

0 files changed, 0 insertions, 0 deletions