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Re: [ft-devel] [GSoC] CID font support, and others
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From: |
Werner LEMBERG |
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Subject: |
Re: [ft-devel] [GSoC] CID font support, and others |
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Date: |
Fri, 28 Jul 2017 09:47:24 +0200 (CEST) |
> You might (or might not?) have noticed, I've pushed all changes into
> `ewaldhew-cleaned' a few days ago.
I noticed, thanks, but I'm still on vacation, so it will take some
time until I can comment on more details.
> I've been comparing the charstrings and hinter movements, but the
> lack of visualization makes this tedious. Nothing stands out as
> being the culprit, and each time I find a possible cause, I'd find
> the same pattern in some other glyph that renders fine.
I suggest that you add tracing messages. For example, the attached
excerpt from a log file shows what the auto-hinter emits for glyph
index 2 of the font `c059013l.pfb' (URW Century Schoolbook L Roman
version 1.06). I called
FT2_DEBUG=any:7 ftview 20 c059013l.pfb &> c059013l.log
then pressing key `f' to enforce full auto-hinting.
As you can see, it is quite detailed.
In general, more tracing data is always a good thing; it might also
help later developers follow your changes (and earlier ones) step by
step.
> Besides this issue, I'm also meaning to look into the issue of slow
> CFF loading (bug #43248) mentioned by Alexei at the start. Not sure
> where to start, so I'd be glad for any advice.
A starting point might be running ftbench with a profiler. I
sometimes use valgrind for that:
valgrind --tool=callgrind ...
The resulting data can then be visualized with `kcachegrind'. There
are certainly other profiling tools that you might find helpful.
> For now, this is what I'll be doing for this final phase. Of
> course, there's also fixing up all the documentation, and more bugs
> may yet rear their ugly head...
:-)
Werner
T1_Load_Glyph: glyph index 2
Start charstring
(0) 87 296 hsbw
(0) -14 125 hstem
(0) 716 20 hstem
(0) 82 191 rmoveto
(0) 1 176 4 50 19 94 rrcurveto
(0) 14 70 4 31 0 29 rrcurveto
(0) 64 -20 31 -41 vhcurveto
(0) -41 -21 -32 -62 hvcurveto
(0) 0 -30 4 -31 14 -70 rrcurveto
(0) 19 -94 3 -47 2 -179 rrcurveto
(0) closepath
(0) 20 -80 rmoveto
(0) -35 -28 -28 -34 hvcurveto
(0) -35 28 -28 34 vhcurveto
(0) 35 28 28 35 hvcurveto
(0) 34 -28 28 -34 vhcurveto
(0) closepath
(0) endchar
x advance: 296
y advance: 0
linear x advance: 296
linear y advance: 0
latin vertical edge hinting (style `latn_dflt')
ANCHOR: edge 0 (opos=1.77) and 3 (opos=4.22) snapped to 2.00 and 4.22
LINK: edge 3 (opos=4.22) linked to 4.09, dist was 2.45, now 2.09
STEM: edge 1 (opos=2.55) linked to 2 (opos=3.38) snapped to 3.00 and 4.00
ADJUST: edge 3 (pos=4.09) moved to 4.09
latin horizontal edge hinting (style `latn_dflt')
BLUE_ANCHOR: edge 0 (opos=-0.30) snapped to 0.00, was -0.30 (anchor=edge 0)
LINK: edge 1 (opos=2.31) linked to 2.84, dist was 2.61, now 2.84
BLUE: edge 3 (opos=15.30) snapped to 15.00, was 15.30
SERIF_LINK1: edge 2 (opos=3.97) snapped to 4.39 from 1 (opos=2.31)
Table of points:
index hedge hseg vedge vseg flags xorg yorg xscale yscale xfit
yfit
0 2 1 2 0 strong 169 191 3.38 3.97 4.00
4.39
1 -- -- 2 0 weak 170 367 3.41 7.62 4.00
7.81
2 -- -- -- -- weak 174 417 3.48 8.67 4.02
8.80
3 -- -- -- -- weak 193 511 3.86 10.62 4.05
10.62
4 -- -- -- -- weak 207 581 4.14 12.08 4.08
11.98
5 -- -- 3 1 weak 211 612 4.22 12.72 4.09
12.58
6 -- -- 3 1 weak 211 641 4.22 13.31 4.09
13.14
7 -- -- 3 1 weak 211 705 4.22 14.66 4.09
14.41
8 3 0 -- -- weak 191 736 3.81 15.30 3.75
15.00
9 3 0 -- -- weak 150 736 3.00 15.30 3.05
15.00
10 3 0 -- -- weak 109 736 2.19 15.30 2.36
15.00
11 -- -- 0 2 weak 88 704 1.77 14.62 2.00
14.38
12 -- -- 0 2 weak 88 642 1.77 13.34 2.00
13.17
13 -- -- 0 2 weak 88 612 1.77 12.72 2.00
12.58
14 -- -- -- -- weak 92 581 1.84 12.08 2.11
11.98
15 -- -- -- -- weak 106 511 2.12 10.62 2.48
10.62
16 -- -- 1 3 weak 125 417 2.50 8.67 3.00
8.80
17 -- -- 1 3 weak 128 370 2.56 7.69 3.00
7.88
18 2 1 1 3 strong 130 191 2.59 3.97 3.00
4.39
19 1 2 -- -- weak 150 111 3.00 2.31 3.06
2.84
20 1 2 -- -- weak 115 111 2.30 2.31 2.47
2.84
21 -- -- 0 4 weak 87 83 1.73 1.72 2.00
2.20
22 -- -- 0 4 weak 87 49 1.73 1.02 2.00
1.44
23 -- -- 0 4 weak 87 14 1.73 0.30 2.00
0.64
24 0 3 -- -- weak 115 -14 2.30 -0.30 2.47
0.00
25 0 3 -- -- weak 149 -14 2.98 -0.30 3.05
0.00
26 0 3 -- -- weak 184 -14 3.69 -0.30 3.64
0.00
27 -- -- 3 5 weak 212 14 4.23 0.30 4.09
0.64
28 -- -- 3 5 weak 212 49 4.23 1.02 4.09
1.44
29 -- -- 3 5 weak 212 83 4.23 1.72 4.09
2.20
30 1 2 -- -- weak 184 111 3.69 2.31 3.64
2.84
Table of horizontal segments:
index pos delta dir from to link serif edge height extra
flags
0 736 0 left 8 10 -- -- 3 102 20
round
1 191 0 right 18 0 -- -- 2 40 1
normal
2 111 0 left 30 20 3 -- 1 97 28
round
3 -14 0 right 24 26 2 -- 0 97 28
round
Table of vertical segments:
index pos delta dir from to link serif edge height extra
flags
0 169 0 up 0 1 3 -- 2 201 25
round
1 211 0 up 5 7 2 -- 3 123 30
round
2 88 0 down 11 13 1 -- 0 123 31
round
3 127 2 down 16 18 0 -- 1 273 47
round
4 87 0 down 21 23 5 -- 0 97 28
round
5 212 0 up 27 29 4 -- 3 97 28
round
Table of horizontal edges (1px=48.13u, 10u=0.21px):
index pos dir link serif blue opos pos flags
0 -0.30 right 1 -- y -0.30 0.00 round
1 2.31 left 0 -- n 2.31 2.84 round
2 3.97 right -- -- n 3.97 4.39 normal
3 15.30 left -- -- y 15.30 15.00 round
Table of vertical edges (1px=50.00u, 10u=0.20px):
index pos dir link serif blue opos pos flags
0 1.77 down 3 -- n 1.77 2.00 round
1 2.55 down 2 -- n 2.55 3.00 round
2 3.38 up 1 -- n 3.38 4.00 round
3 4.22 up 0 -- n 4.22 4.09 round
x advance: 384
y advance: 0
linear x advance: 387973
linear y advance: 0
FT_Outline_Decompose: Outline 0
move to (2.00, 4.39)
cubic to (2.05, 10.62) with controls (2.00, 7.81) and (2.02, 8.80)
cubic to (2.09, 13.14) with controls (2.08, 11.98) and (2.09, 12.58)
cubic to (1.05, 15.00) with controls (2.09, 14.41) and (1.75, 15.00)
cubic to (0.00, 13.17) with controls (0.36, 15.00) and (0.00, 14.38)
cubic to (0.48, 10.62) with controls (0.00, 12.58) and (0.11, 11.98)
cubic to (1.00, 4.39) with controls (1.00, 8.80) and (1.00, 7.88)
line to (2.00, 4.39)
FT_Outline_Decompose: Outline 1
move to (1.06, 2.84)
cubic to (0.00, 1.44) with controls (0.47, 2.84) and (0.00, 2.20)
cubic to (1.05, 0.00) with controls (0.00, 0.64) and (0.47, 0.00)
cubic to (2.09, 1.44) with controls (1.64, 0.00) and (2.09, 0.64)
cubic to (1.06, 2.84) with controls (2.09, 2.20) and (1.64, 2.84)
FT_Outline_Decompose: Done
band [0..15]: 31 cells
gray_sweep: start
gray_sweep: end
MD5 checksum for 15x3 bitmap:
2F71C6552D50DD73130CE5EB6AB686C3