Re: [ft-devel] PDF text rendering error

Attached is my proposal to fix this issue, please try.

In my case (Debian GNU/Linux xpdf-3.02-11), using the

patched freetype library by LD_PRELOAD, xpdf shows

readable result (without patch, the result is unreadable).

Regards,

mpsuzuki

suzuki toshiya wrote:

> Johnson Y. Yan wrote (2012/06/11 16:03):

>> Werner and Toshiya-san,

>> I put the font as a tricky font to deal with.

>> static const char trick_names[TRICK_NAMES_COUNT]

>> [TRICK_NAMES_MAX_CHARACTERS + 1] =

>> {

>> "DFKaiSho-SB", /* dfkaisb.ttf */

>> "DFKaiShu",

>> "DFKai-SB", /* kaiu.ttf */

>> "HuaTianKaiTi?", /* htkt2.ttf */

>> "HuaTianSongTi?", /* htst3.ttf */

>> "MingLiU", /* mingliu.ttf & mingliu.ttc */

>> "PMingLiU", /* mingliu.ttc */

>> "MingLi43", /* mingli.ttf */

>> "BKLGIB+FA" ---------------------------------------- this is the

>> embeded font in th document.

>> };

>> it still render error. .

> Including the randomization prefix to the tricky font name list is bad

> idea.

>> I opened the embeded font use font lab, found the gid = 2134 is like

>> this, please see the attach bitmap,

>> some of lines form a 0 area areas, then fill the area(have no area),

>> Does freetype made special processing?

>> Johnson Y. Yan

>> 发件人： Werner LEMBERG

>> 发送时间： 2012-06-11 12:55:42

>> 收件人： yinsen_yan

>> 抄送： freetype-devel; mpsuzuki

>> 主题： Re: PDF text rendering error

>>> Do you mean the font must be rendered use

>>> TT_CONFIG_OPTION_BYTECODE_INTERPRETER?

>> No, the FreeType *library* must be built with it: Edit ftoption.h to

>> set this flag, then recompile.

>> Additionally, hinting must be enabled for this font, this is,

>> FT_LOAD_NO_SCALE doesn't work here.

>> Normally, those steps are (more or less) handled automatically by

>> FreeType, since we maintain a list of `tricky' font like the one you

>> have encountered in the PDF; see file `ttobjs.c'. The subsetted font

>> in question, however, which identifies itself as

>> BKLGIB+FA-RoundGothicB

>> ＦＡ丸ゴシックＢ and FA-RoundGothicB are trademarks of NEC Office

>> Systems,Ltd.

>> isn't in this list; for the NEC FA fonts (and others), a second

>> mechanism is used which doesn't work with subsetted fonts.

>> Toshiya-san, any ideas?

>> Werner

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From:	Johnson Y. Yan
Subject:	Re: [ft-devel] PDF text rendering error
Date:	Mon, 11 Jun 2012 18:11:52 +0800