Package: emacs;
Reported by: Werner LEMBERG <wl <at> gnu.org>
Date: Thu, 27 Dec 2018 08:56:01 UTC
Severity: normal
Tags: moreinfo
Found in version 27.0.50
Fixed in version 29.1
Done: Lars Ingebrigtsen <larsi <at> gnus.org>
Bug is archived. No further changes may be made.
Message #29 received at 33885 <at> debbugs.gnu.org (full text, mbox):
From: Werner LEMBERG <wl <at> gnu.org> To: eliz <at> gnu.org Cc: 33885 <at> debbugs.gnu.org Subject: Re: bug#33885: 27.0.50; PUA character makes emacs crash Date: Fri, 28 Dec 2018 13:38:56 +0100 (CET)
>> Character U+E6A3 gets mapped to glyph 3817, `uni00720325', which is
>> glyph `r' with a ring below; the `ttx' font disassembler shows the
>> following entry from the font's `glyf' table:
>>
>> <TTGlyph name="uni00720325" xMin="52" yMin="-510" xMax="747" yMax="927">
>> <component glyphName="r" x="0" y="0" flags="0x204"/>
>> <component glyphName="ring" x="-39" y="-1589" flags="0x4"/>
>> </TTGlyph>
>
> Does this explain why the descent comes out negative? (I'm not an
> expert on font metrics.)
No. The `glyf' data of this glyph looks correct.
> The way I would suggest to put a useful breakpoint there is this:
>
> break x_produce_glyphs if it->char_to_display == 0xe6a3
OK, did that. Here's the contents of `it' ($11), `face' ($12), and
`font' ($13), respectively, at xdisp.c:28221. The `font' entry looks
very strange.
AFAICS, it's not a problem related to a single glyph. We rather have
to check how the `Cardo' fonts get loaded into Emacs; it looks as if
the global font descent value is incorrect. Please tell me (a) how to
identify the font used for U+E6A3, and (b) where to set a breakpoint
to see the font loading in action.
And indeed, ttx shows the following for the global values (in the
`hhea' table):
<ascent value="1645"/>
<descent value="620"/>
Compare this to, say, LiberationMono-Regular:
<ascent value="1705"/>
<descent value="-615"/>
So we have a font error in Cardo, setting the (Apple specific) descent
with the wrong sign.
Handling the ascent and descent in OpenType is a mess, since up to
three competing sets are present in the font. See
http://www.typophile.com/node/13081
for a quite exhaustive discussion.
Werner
======================================================================
$11 = {
window = {
i = 0x15e8fa5
},
w = 0x15e8fa0,
f = 0x15e7fa0,
method = GET_FROM_BUFFER,
stop_charpos = 3,
prev_stop = 1,
base_level_stop = 0,
end_charpos = 3,
s = 0x0,
string_nchars = 0,
redisplay_end_trigger_charpos = 0,
multibyte_p = true,
header_line_p = false,
string_from_display_prop_p = false,
string_from_prefix_prop_p = false,
from_disp_prop_p = false,
ellipsis_p = false,
avoid_cursor_p = false,
dp = 0x0,
dpvec = 0x0,
dpend = 0x0,
dpvec_char_len = 0,
dpvec_face_id = 0,
saved_face_id = 0,
ctl_chars = {{
i = 0x0
} <repeats 16 times>},
start = {
pos = {
charpos = 1,
bytepos = 1
},
overlay_string_index = -1,
string_pos = {
charpos = -1,
bytepos = -1
},
dpvec_index = -1
},
current = {
pos = {
charpos = 1,
bytepos = 1
},
overlay_string_index = -1,
string_pos = {
charpos = -1,
bytepos = -1
},
dpvec_index = -1
},
n_overlay_strings = 0,
overlay_strings_charpos = 1,
overlay_strings = {{
i = 0x0
} <repeats 16 times>},
string_overlays = {{
i = 0x0
} <repeats 16 times>},
string = {
i = 0x0
},
from_overlay = {
i = 0x0
},
stack = {{
string = {
i = 0x0
},
string_nchars = 0,
end_charpos = 0,
stop_charpos = 0,
prev_stop = 0,
base_level_stop = 0,
cmp_it = {
stop_pos = 0,
id = 0,
ch = 0,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = false,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
face_id = 0,
u = {
image = {
object = {
i = 0x0
},
slice = {
x = {
i = 0x0
},
y = {
i = 0x0
},
width = {
i = 0x0
},
height = {
i = 0x0
}
},
image_id = 0
},
stretch = {
object = {
i = 0x0
}
},
xwidget = {
object = {
i = 0x0
}
}
},
position = {
charpos = 0,
bytepos = 0
},
current = {
pos = {
charpos = 0,
bytepos = 0
},
overlay_string_index = 0,
string_pos = {
charpos = 0,
bytepos = 0
},
dpvec_index = 0
},
from_overlay = {
i = 0x0
},
area = LEFT_MARGIN_AREA,
method = GET_FROM_BUFFER,
paragraph_embedding = NEUTRAL_DIR,
multibyte_p = false,
string_from_display_prop_p = false,
string_from_prefix_prop_p = false,
display_ellipsis_p = false,
avoid_cursor_p = false,
bidi_p = false,
from_disp_prop_p = false,
line_wrap = TRUNCATE,
voffset = 0,
space_width = {
i = 0x0
},
font_height = {
i = 0x0
}
}, {
string = {
i = 0x0
},
string_nchars = 0,
end_charpos = 0,
stop_charpos = 0,
prev_stop = 0,
base_level_stop = 0,
cmp_it = {
stop_pos = 0,
id = 0,
ch = 0,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = false,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
face_id = 0,
u = {
image = {
object = {
i = 0x0
},
slice = {
x = {
i = 0x0
},
y = {
i = 0x0
},
width = {
i = 0x0
},
height = {
i = 0x0
}
},
image_id = 0
},
stretch = {
object = {
i = 0x0
}
},
xwidget = {
object = {
i = 0x0
}
}
},
position = {
charpos = 0,
bytepos = 0
},
current = {
pos = {
charpos = 0,
bytepos = 0
},
overlay_string_index = 0,
string_pos = {
charpos = 0,
bytepos = 0
},
dpvec_index = 0
},
from_overlay = {
i = 0x0
},
area = LEFT_MARGIN_AREA,
method = GET_FROM_BUFFER,
paragraph_embedding = NEUTRAL_DIR,
multibyte_p = false,
string_from_display_prop_p = false,
string_from_prefix_prop_p = false,
display_ellipsis_p = false,
avoid_cursor_p = false,
bidi_p = false,
from_disp_prop_p = false,
line_wrap = TRUNCATE,
voffset = 0,
space_width = {
i = 0x0
},
font_height = {
i = 0x0
}
}, {
string = {
i = 0x0
},
string_nchars = 0,
end_charpos = 0,
stop_charpos = 0,
prev_stop = 0,
base_level_stop = 0,
cmp_it = {
stop_pos = 0,
id = 0,
ch = 0,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = false,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
face_id = 0,
u = {
image = {
object = {
i = 0x0
},
slice = {
x = {
i = 0x0
},
y = {
i = 0x0
},
width = {
i = 0x0
},
height = {
i = 0x0
}
},
image_id = 0
},
stretch = {
object = {
i = 0x0
}
},
xwidget = {
object = {
i = 0x0
}
}
},
position = {
charpos = 0,
bytepos = 0
},
current = {
pos = {
charpos = 0,
bytepos = 0
},
overlay_string_index = 0,
string_pos = {
charpos = 0,
bytepos = 0
},
dpvec_index = 0
},
from_overlay = {
i = 0x0
},
area = LEFT_MARGIN_AREA,
method = GET_FROM_BUFFER,
paragraph_embedding = NEUTRAL_DIR,
multibyte_p = false,
string_from_display_prop_p = false,
string_from_prefix_prop_p = false,
display_ellipsis_p = false,
avoid_cursor_p = false,
bidi_p = false,
from_disp_prop_p = false,
line_wrap = TRUNCATE,
voffset = 0,
space_width = {
i = 0x0
},
font_height = {
i = 0x0
}
}, {
string = {
i = 0x0
},
string_nchars = 0,
end_charpos = 0,
stop_charpos = 0,
prev_stop = 0,
base_level_stop = 0,
cmp_it = {
stop_pos = 0,
id = 0,
ch = 0,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = false,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
face_id = 0,
u = {
image = {
object = {
i = 0x0
},
slice = {
x = {
i = 0x0
},
y = {
i = 0x0
},
width = {
i = 0x0
},
height = {
i = 0x0
}
},
image_id = 0
},
stretch = {
object = {
i = 0x0
}
},
xwidget = {
object = {
i = 0x0
}
}
},
position = {
charpos = 0,
bytepos = 0
},
current = {
pos = {
charpos = 0,
bytepos = 0
},
overlay_string_index = 0,
string_pos = {
charpos = 0,
bytepos = 0
},
dpvec_index = 0
},
from_overlay = {
i = 0x0
},
area = LEFT_MARGIN_AREA,
method = GET_FROM_BUFFER,
paragraph_embedding = NEUTRAL_DIR,
multibyte_p = false,
string_from_display_prop_p = false,
string_from_prefix_prop_p = false,
display_ellipsis_p = false,
avoid_cursor_p = false,
bidi_p = false,
from_disp_prop_p = false,
line_wrap = TRUNCATE,
voffset = 0,
space_width = {
i = 0x0
},
font_height = {
i = 0x0
}
}, {
string = {
i = 0x0
},
string_nchars = 0,
end_charpos = 0,
stop_charpos = 0,
prev_stop = 0,
base_level_stop = 0,
cmp_it = {
stop_pos = 0,
id = 0,
ch = 0,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = false,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
face_id = 0,
u = {
image = {
object = {
i = 0x0
},
slice = {
x = {
i = 0x0
},
y = {
i = 0x0
},
width = {
i = 0x0
},
height = {
i = 0x0
}
},
image_id = 0
},
stretch = {
object = {
i = 0x0
}
},
xwidget = {
object = {
i = 0x0
}
}
},
position = {
charpos = 0,
bytepos = 0
},
current = {
pos = {
charpos = 0,
bytepos = 0
},
overlay_string_index = 0,
string_pos = {
charpos = 0,
bytepos = 0
},
dpvec_index = 0
},
from_overlay = {
i = 0x0
},
area = LEFT_MARGIN_AREA,
method = GET_FROM_BUFFER,
paragraph_embedding = NEUTRAL_DIR,
multibyte_p = false,
string_from_display_prop_p = false,
string_from_prefix_prop_p = false,
display_ellipsis_p = false,
avoid_cursor_p = false,
bidi_p = false,
from_disp_prop_p = false,
line_wrap = TRUNCATE,
voffset = 0,
space_width = {
i = 0x0
},
font_height = {
i = 0x0
}
}},
sp = 0,
selective = 0,
what = IT_CHARACTER,
face_id = 17,
selective_display_ellipsis_p = true,
ctl_arrow_p = true,
face_box_p = false,
start_of_box_run_p = false,
end_of_box_run_p = false,
overlay_strings_at_end_processed_p = false,
ignore_overlay_strings_at_pos_p = false,
glyph_not_available_p = false,
starts_in_middle_of_char_p = false,
face_before_selective_p = false,
constrain_row_ascent_descent_p = false,
line_number_produced_p = false,
line_wrap = WINDOW_WRAP,
base_face_id = 0,
c = 59043,
len = 3,
cmp_it = {
stop_pos = 1,
id = -1,
ch = -2,
rule_idx = 0,
lookback = 0,
nglyphs = 0,
reversed_p = false,
charpos = 0,
nchars = 0,
nbytes = 0,
from = 0,
to = 0,
width = 0
},
char_to_display = 59043,
glyphless_method = GLYPHLESS_DISPLAY_THIN_SPACE,
image_id = 0,
xwidget = 0x0,
slice = {
x = {
i = 0x0
},
y = {
i = 0x0
},
width = {
i = 0x0
},
height = {
i = 0x0
}
},
space_width = {
i = 0x0
},
voffset = 0,
tab_width = 8,
font_height = {
i = 0x0
},
object = {
i = 0x120c2e5
},
position = {
charpos = 1,
bytepos = 1
},
truncation_pixel_width = 0,
continuation_pixel_width = 11,
first_visible_x = 0,
last_visible_x = 880,
last_visible_y = 850,
extra_line_spacing = 0,
max_extra_line_spacing = 0,
override_ascent = -1,
override_descent = 0,
override_boff = 0,
glyph_row = 0x1c06800,
area = TEXT_AREA,
nglyphs = 1,
pixel_width = 0,
ascent = 0,
descent = 0,
max_ascent = 0,
max_descent = 0,
phys_ascent = 0,
phys_descent = 0,
max_phys_ascent = 0,
max_phys_descent = 0,
current_x = 0,
continuation_lines_width = 0,
eol_pos = {
charpos = 0,
bytepos = 0
},
current_y = 0,
first_vpos = 0,
vpos = 0,
hpos = 0,
lnum = 0,
lnum_bytepos = 0,
lnum_width = 0,
lnum_pixel_width = 0,
pt_lnum = 0,
tab_offset = 0,
left_user_fringe_bitmap = 0,
right_user_fringe_bitmap = 0,
left_user_fringe_face_id = 0,
right_user_fringe_face_id = 0,
bidi_p = true,
bidi_it = {
bytepos = 1,
charpos = 1,
ch = 59043,
nchars = 1,
ch_len = 3,
type = STRONG_L,
type_after_wn = STRONG_L,
orig_type = STRONG_L,
resolved_level = 0 '\000',
isolate_level = 0 '\000',
invalid_levels = 0,
invalid_isolates = 0,
prev = {
charpos = 1,
type = NEUTRAL_B,
orig_type = NEUTRAL_B
},
last_strong = {
charpos = 0,
type = UNKNOWN_BT,
orig_type = UNKNOWN_BT
},
next_for_neutral = {
charpos = -1,
type = UNKNOWN_BT,
orig_type = UNKNOWN_BT
},
prev_for_neutral = {
charpos = 1,
type = STRONG_L,
orig_type = UNKNOWN_BT
},
next_for_ws = {
charpos = -1,
type = UNKNOWN_BT,
orig_type = UNKNOWN_BT
},
bracket_pairing_pos = -1,
bracket_enclosed_type = UNKNOWN_BT,
next_en_pos = 0,
next_en_type = UNKNOWN_BT,
sos = L2R,
scan_dir = 1,
disp_pos = 3,
disp_prop = 0,
stack_idx = 0,
level_stack = {{
next_for_neutral_pos = 0,
next_for_neutral_type = 0,
last_strong_type = 0,
prev_for_neutral_type = 0,
level = 0 '\000',
flags = 0 '\000'
} <repeats 128 times>},
string = {
lstring = {
i = 0x0
},
s = 0x0,
schars = 0,
bufpos = 0,
from_disp_str = false,
unibyte = false
},
w = 0x15e8fa0,
paragraph_dir = L2R,
separator_limit = -1,
first_elt = false,
new_paragraph = false,
frame_window_p = true
},
paragraph_embedding = L2R
}
$12 = {
lface = {{
i = 0x5970
}, {
i = 0x1b645e4
}, {
i = 0x1b64624
}, {
i = 0x9de0
}, {
i = 0x1b2
}, {
i = 0x9de0
}, {
i = 0x9de0
}, {
i = 0x0
}, {
i = 0x0
}, {
i = 0x1b6ec74
}, {
i = 0x1b6ec94
}, {
i = 0x0
}, {
i = 0x0
}, {
i = 0x0
}, {
i = 0x0
}, {
i = 0x15f0085
}, {
i = 0x0
}, {
i = 0x1b720a4
}, {
i = 0xd5f0
}},
id = 17,
gc = 0x0,
stipple = 0,
foreground = 0,
background = 16777215,
underline_color = 0,
overline_color = 0,
strike_through_color = 0,
box_color = 0,
font = 0x226b780,
fontset = 3,
box_line_width = 0,
box = FACE_NO_BOX,
underline_type = FACE_UNDER_LINE,
use_box_color_for_shadows_p = false,
underline_p = false,
overline_p = false,
strike_through_p = false,
foreground_defaulted_p = false,
background_defaulted_p = false,
underline_defaulted_p = false,
overline_color_defaulted_p = false,
strike_through_color_defaulted_p = false,
box_color_defaulted_p = false,
tty_bold_p = false,
tty_italic_p = false,
tty_underline_p = false,
tty_reverse_p = false,
colors_copied_bitwise_p = true,
overstrike = false,
hash = 1344140,
next = 0x0,
prev = 0x191c150,
ascii_face = 0x191c150,
extra = 0x0
}
$13 = {
header = {
size = 4611686018880454673
},
props = {{
i = 0xe7f0
}, {
i = 0x11d8390
}, {
i = 0x11d83c0
}, {
i = 0x0
}, {
i = 0x7f50
}, {
i = 0x19142
}, {
i = 0x19082
}, {
i = 0x19102
}, {
i = 0x4e
}, {
i = 0x0
}, {
i = 0x0
}, {
i = 0x2
}, {
i = 0x211e4b3
}, {
i = 0x0
}, {
i = 0x1cf1da4
}, {
i = 0x1cf1dc4
}, {
i = 0x20445d4
}},
min_width = 5,
max_width = 5,
pixel_size = 19,
height = 11,
space_width = 5,
average_width = 10,
ascent = 16,
descent = -5,
underline_thickness = 0,
underline_position = 1,
vertical_centering = false,
baseline_offset = 0,
relative_compose = 0,
default_ascent = 0,
encoding_charset = -1,
repertory_charset = -1,
driver = 0x7b5fa0 <xftfont_driver>
}
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Copyright (C) 1999 Darren O. Benham,
1997,2003 nCipher Corporation Ltd,
1994-97 Ian Jackson.