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96 Commits

Author SHA1 Message Date
Nigel Tao
11bef13aa5 freetype/truetype: track phantom points across compound glyphs. 
The very subtle pp1x versus phantomPoints[0].X distinction is pretty
ugly code, but let's get all the tests passing first, so that we can
refactor with confidence.

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/35850043
 2013-12-03 08:21:05 +11:00
Nigel Tao
5cb0a99dcd freetype/truetype: fix Super45 rounding. 
R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/34790045
 2013-11-30 15:19:12 +11:00
Nigel Tao
1f97ea5d8e freetype/truetype: apply the pp1x adjustment to the unhinted points 
*before* hinting.

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/35070044
 2013-11-29 22:12:55 +11:00
Nigel Tao
114d43ecfe freetype/truetype: load vertical metrics from the OS/2 table. 
R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/34700043
 2013-11-29 10:33:11 +11:00
Nigel Tao
1c0c5a1f9a freetype/truetype: upgrade testdata to C Freetype 2.5.1. 
R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/33650044
 2013-11-28 14:02:28 +11:00
Nigel Tao
02a88bab17 freetype/truetype: fix SHC, MIRP opcodes. 
R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/33750043
 2013-11-27 20:09:54 +11:00
Nigel Tao
5a5d117404 freetype/truetype: normalize and set dual vector for SPVFS and SFVFS 
opcodes. Calculate dot product with 32-bit math to match C Freetype's
rounding.

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/32740043
 2013-11-27 17:48:57 +11:00
Nigel Tao
cce54f9bf8 freetype/truetype: fix order of 1st phantom point adjustment and 
2nd / 4th phantom point rounding.

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/32040043
 2013-11-26 20:06:51 +11:00
Nigel Tao
cef9ca89c7 freetype/truetype: implement ISECT, SHC, WCVTF, DELTAC and SDPVTL 
opcodes.

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/29510043
 2013-11-21 08:51:09 +11:00
Nigel Tao
f6106a9f8b freetype/truetype: adjust ends slice when hinting a compound glyph. 
Successfully hint all of DejaVu Sans Oblique, barring 4 exceptions
that are errors in the upstream C Freetype project. See
http://lists.nongnu.org/archive/html/freetype/2013-11/msg00004.html
for details.

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/21580044
 2013-11-07 08:53:15 +11:00
Nigel Tao
cdaff3c716 freetype/truetype: run compound glyph hinting instructions. 
Also add API for vertical metrics.

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/21330043
 2013-11-05 09:58:40 +11:00
Nigel Tao
1f81822fe1 freetype/truetype: recalculate 'phantom point 1' after rounding. 
R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/19090043
 2013-10-30 07:50:48 +11:00
Nigel Tao
e849ac9382 freetype: fix MDRP/MIRP Set-RP0 bit and fix normalize rounding. 
Also make phantom point delta-X adjustment.

Also make print-glyph-points require Freetype version >= 2.5, which is
the latest version, at the time of writing.

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/18370043
 2013-10-29 20:59:39 +11:00
Nigel Tao
ab80f5823d freetype/truetype: implement SHP and DELTAP opcodes. 
R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/16500043
 2013-10-25 20:07:33 +11:00
R?my Oudompheng
486e1683dd freetype/truetype: handle control value cut-in in MIRP. 
The difference is quite large on glyph 509 (period character)
of Adobe Source Sans Pro Bold Italic.

R=golang-dev, nigeltao, bsiegert
CC=golang-dev
https://codereview.appspot.com/16820043

Committer: Nigel Tao <nigeltao@golang.org>
 2013-10-25 11:01:57 +11:00
R?my Oudompheng
5ac614f802 freetype/truetype: implement MSIRP instruction. 
R=golang-dev, nigeltao, bsiegert
CC=golang-dev
https://codereview.appspot.com/16630044

Committer: Nigel Tao <nigeltao@golang.org>
 2013-10-25 11:00:02 +11:00
R?my Oudompheng
7bee3b6fe0 freetype/truetype: implement GC and MD instructions. 
These instructions are found in Adobe Source Sans Pro fonts.

R=golang-dev, nigeltao, bsiegert
CC=golang-dev
https://codereview.appspot.com/16440043

Committer: Nigel Tao <nigeltao@golang.org>
 2013-10-24 20:17:56 +11:00
Nigel Tao
ab106efa01 freetype/truetype: implement SPVTL, SFVTL, SHZ, SHPIX opcodes. 
Fix MIRP opcodes, scaled CVT initialization and Hinter.move.

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/14930050
 2013-10-24 10:47:50 +11:00
R?my Oudompheng
e1f638ef1d freetype/truetype: fix IP rounding for negative numbers. 
Found in Adobe Source Sans Pro.

R=golang-dev, bsiegert, nigeltao
CC=golang-dev
https://codereview.appspot.com/15360043

Committer: Nigel Tao <nigeltao@golang.org>
 2013-10-22 17:13:52 +11:00
Nigel Tao
b821f16356 freetype/truetype: WCVTP, RCVT opcodes. 
R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14802046
 2013-10-19 10:04:03 +11:00
Nigel Tao
bb775957cb freetype/truetype: propagate the useMyMetrics flag to nested components. 
Also increase the maximum recursion depth from 4 to 8, since some
x-deja-vu-sans-oblique glyphs are actually depth 4. It's an arbitrary
limit. The C Freetype code doesn't seem to limit recursion (below
whatever the font says it needs), but it seems safer to have a limit.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14494062
 2013-10-17 10:21:20 +11:00
Nigel Tao
8373bbf0e6 freetype/truetype: implement compound glyph transforms. 
R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14425064
 2013-10-16 21:39:06 +11:00
Nigel Tao
c8094ec963 freetype/truetype: refactor glyph.go; match C Freetype's rounding on 
one more test case.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14691043
 2013-10-16 18:54:54 +11:00
Nigel Tao
95f62386c3 freetype/truetype: enable the Times New Roman tests. 
R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14641043
 2013-10-15 09:26:07 +11:00
Nigel Tao
30be3ed95b freetype/truetype: speed up the testScaling test function. 
"go test" drops from 5.203s to 0.474s.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14566047
 2013-10-13 15:43:34 +11:00
Nigel Tao
9e24a6204e freetype/truetype: implement Font.Index binary search. 
R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14604044
 2013-10-12 09:29:59 +11:00
Nigel Tao
0a778f7f02 freetype/truetype: parse UCS-4 encoded cmap tables. 
R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14548046
 2013-10-11 07:29:40 +11:00
Nigel Tao
ba07cbfbc8 freetype/truetype: set the four phantom points, and adjust the glyph 
points accordingly.

Yes, it's a mess, but let's pass the tests first, and then refactor.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14419052
 2013-10-10 07:43:32 +11:00
Nigel Tao
b76427be47 freetype: add script to create more hinting tests. 
R=bsiegert, r
CC=golang-dev
https://codereview.appspot.com/14414044
 2013-10-09 20:07:32 +11:00
Nigel Tao
b968fb0953 freeetype: move the test fonts from the luxi-fonts/ directory to 
testdata/, in anticipation of having other test data.

R=dsymonds
CC=bsiegert, golang-dev
https://codereview.appspot.com/14361044
 2013-10-04 17:03:59 +10:00
Nigel Tao
0ec7c0ecae freetype/truetype: fix IUP rounding for negative numbers. 
We now match Freetype C exactly for hinting luxisr.ttf. Yay.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14336044
 2013-10-04 08:30:53 +10:00
Nigel Tao
7e90529703 freetype/truetype: fix the SSW instruction to scale the single-width 
value and the MDRP instruction's use of the single-width value.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14273043
 2013-10-03 21:32:43 +10:00
Nigel Tao
7505dadf20 freetype/truetype: make a (sub-)glyph's points an explicit part of a 
Hinter's state, instead of having a glyph shrink and restore its
points around hinting.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14203043
 2013-10-02 20:37:11 +10:00
Nigel Tao
e88fe00bdb freetype/truetype: fix hinting of compound glyphs. 
R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14117043
 2013-10-01 18:08:52 +10:00
Nigel Tao
3490800cec freetype/truetype: fix rounding for negative numbers to match the C 
Freetype implementation.

The spec is the "Order of rounding operations" part of
https://developer.apple.com/fonts/TTRefMan/RM02/Chap2.html#rounding
but it wasn't exactly clear to me what "the negative round value
closest to zero" was: if the phase is 1/4, was that value -1/4 or
-3/4? Anyway, the Go code now follows the C code, and code trumps
documentation.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/14092044
 2013-09-29 18:30:55 +10:00
Nigel Tao
c661e372c6 freetype/truetype: implement IUP opcode. 
R=bsiegert
CC=golang-dev
https://codereview.appspot.com/13965043
 2013-09-29 12:09:09 +10:00
Nigel Tao
75fff80b59 freetype/truetype: implement IP, MIAP, MIRP opcodes. 
R=bsiegert
CC=golang-dev
https://codereview.appspot.com/13855043
 2013-09-24 22:06:47 +10:00
Nigel Tao
a3c53fdc3f freetype/truetype: implement ALIGNRP, MDAP and MDRP opcodes. 
We can now hint the .notdef glyph from luxisr.ttf. Yay.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/12829048
 2013-08-31 16:08:40 +10:00
Nigel Tao
a8a5cfeb78 freetype: respect the ROUND_XY_TO_GRID compound glyph flag. 
Also add a test that freetype-go derives the same glyph points as
the C freetype implementation.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/12670046
 2013-08-13 21:08:54 +10:00
Nigel Tao
43c4b0b00d freetype/truetype: add explicit graphics state. 
These new opcodes aren't unit-tested per se, but they will be
exercised by an end-to-end hinting test of the Luxi fonts.

R=bsiegert
CC=golang-dev
https://codereview.appspot.com/12100043
 2013-08-02 19:13:26 +10:00
Nigel Tao
e3b4bc4c1f freetype/truetype: function call opcodes. 
R=bsiegert
CC=golang-dev
https://codereview.appspot.com/11983043
 2013-07-30 19:20:31 +10:00
Nigel Tao
28cc5fbc5d freetype: move the scaling from FUnits to pixels from package freetype 
to package truetype.

R=bsiegert
CC=golang-dev
http://codereview.appspot.com/6427062
 2012-07-25 22:10:25 +10:00
Nigel Tao
f2517f3940 freetype/truetype: odd/even opcodes. 
Also re-arrange some of the switch cases to be in opcode order.

R=bsiegert
CC=golang-dev
http://codereview.appspot.com/6352097
 2012-07-12 20:49:12 +10:00
Nigel Tao
20ce6ab4df freetype/truetype: variable sized bytecode interpreter stack/store. 
R=bsiegert
CC=golang-dev
http://codereview.appspot.com/6343091
 2012-07-11 21:49:03 +10:00
Nigel Tao
2bf22ccf6b freetype/truetype: vector set/gets, store ops, roll/max/min ops. 
R=bsiegert
CC=golang-dev
http://codereview.appspot.com/6354080
 2012-07-09 23:18:25 +10:00
Nigel Tao
9e927de79b freetype/truetype: rounding opcodes. 
R=bsiegert
CC=golang-dev
http://codereview.appspot.com/6348079
 2012-07-06 17:34:39 +10:00
Nigel Tao
e843d5cf7c freetype/truetype: jump opcodes. 
R=gri, bsiegert
CC=golang-dev
http://codereview.appspot.com/6344079
 2012-07-05 20:29:35 +10:00
Nigel Tao
523d04e0a7 freetype/truetype: if/else opcodes. 
R=gri
CC=golang-dev
http://codereview.appspot.com/6354067
 2012-07-04 21:28:44 +10:00
Nigel Tao
8ed9e9345e freetype/truetype: first cut of a bytecode interpreter. 
R=gri, bsiegert
CC=golang-dev
http://codereview.appspot.com/6347057
 2012-07-03 20:46:16 +10:00
Nigel Tao
6baa5f0a46 freetype: optimize []byte to uint16/uint32 conversions. 
Thanks to Jeff R. Allen <jra@nella.org> for the conversation that
led to this change.

benchmark              old ns/op    new ns/op    delta
BenchmarkDrawString     21168440     20143860   -4.84%

The number of mallocs per iteration is unchanged.

R=rsc, r
CC=golang-dev, jra
http://codereview.appspot.com/6304077
 2012-06-16 12:19:07 +10:00