What you say seems irrelevant to me. Jonathan is correct. On Thu, Apr 11, 2019, 11:34 AM Bobby de Vos <[email protected]> wrote:
> Paul, > > You don't need to convert the Google Tamil font to OpenType, Google has > already done that at > > > https://github.com/googlei18n/noto-fonts/tree/master/phaseIII_only/unhinted/otf/NotoSansTamil > > However, I don't think those fonts will solve your issue. The list of > shapers that you mention are different technologies to specify the complex > shaping (such ligatures, positioning, sub forms, half foms, etc). Indeed, > OpenType is one such technology. SIL Graphite and Apple Advanced Typography > (AAT) are other technologies to do this. > > TrueType fonts can contain OpenType shaping instructions. You do not have > to have an OpenType font format to use OpenType shaping. > > TrueType fonts have quadratic Bézier curves for their glyphs. Fonts in the > OpenType font format can use the same quadratic Bézier curves, or cubic > Bézier curves. The OTF files I mentioned above have cubic Bézier curves. > > https://en.wikipedia.org/wiki/B%C3%A9zier_curve#Fonts > > If I have mis-understood your situation, and/or made any errors if what I > wrote, I apologize. > > Bobby > On 2019-04-10 3:25 p.m., Paul Daughetee wrote: > > Thanks for the quick response. I’m a licensed user of FontCreator > Professional Edition from High-Logic and have the most recent update to > version 11.5 installed. The correct ligature is displayed when I type the > tta and u Tamil characters into the test string edit box in the OpenType > Designer dialog. In the box just below the test string the two characters > are displayed unless I check either the _shaper or psts feature check box. > If one of those is checked, then the correct ligature is displayed. So I > guess Google did get the Tamil font right but I cannot seem to get HarfBuzz > to return a single glyph id when presented with a buffer containing the tta > and u Tamil characters. I’ve tried adding various features when calling > hb_shape but that doesn’t seem to change anything. > > > > I noticed that when I list shapers using a call to hb_shape_list_shapers, > the only shaper listed is “ot”. So I guess my next try will be to convert > the Google Tamil true type font to an open type font and see if that makes > any difference. If it does, I guess I’ll be having a “duh” moment. > > > > *From:* Cody Planteen <[email protected]> <[email protected]> > *Sent:* April 10, 2019 12:38 PM > *To:* Paul Daughetee <[email protected]> <[email protected]> > *Cc:* [email protected] > *Subject:* Re: [HarfBuzz] Question on converting UTF-8 codepoints to > complex glyphs > > > > It's possible your font isn't doing what you think it should be. You can > test this theory with the tool High-Logic FontCreator for Windows. I > believe there is a free evaluation. You can open up your font, then go to > Font -> OpenType Designer. In this dialog, you can enter your test string > and see what glyphs come out. > > > > https://www.high-logic.com/font-editor/fontcreator > > > > > > On Wed, Apr 10, 2019 at 1:19 PM Paul Daughetee <[email protected]> > wrote: > > Let me give you a little more info. I just recently built and installed > vcpkg and used it to install HarfBuzz on Windows 10. It installed version > 2.3.1-3 of the static libraries for Window x86. I linked my app to the > HarfBuzz library and its dependencies. I added code to my app to capture > single words that I could send to be processed by HarfBuzz as they were > typed by the user. I installed Google’s NotoSansTamil true type font after > verifying that it properly defined substitutions for the ligature that is > formed by the Tamil consonant “tta” when paired with a vowel such as “u” or > “I”. After processing a UTF-8 string containing the consonant and the vowel > “tta” and “u” [0xE0, 0xAE, 0x9F, 0xE0, 0xAE, 0x89], the hb_glyph_info_t > object I get back has tow glyph indices, the same indices as the “tta” and > “u” (17, 10) rather than the index for the “ttauvowelsign” (116) ligature I > expected. My code is virtually identical to the examples found in the > HarfBuzz wiki and to several examples found in git. Any help here would be > greatly appreciated. > > > > *From:* Behdad Esfahbod <[email protected]> > *Sent:* April 8, 2019 1:47 PM > *To:* Paul Daughetee <[email protected]> > *Cc:* [email protected] > *Subject:* Re: [HarfBuzz] Question on converting UTF-8 codepoints to > complex glyphs > > > > On Mon, Apr 8, 2019 at 4:12 PM Paul Daughetee <[email protected]> > wrote: > > I’m new to HarfBuzz and attempting to use it for converting a UTF-8 string > that contains one or more sets of codepoints that should combine to form > single complex glyphs to the correct string of glyphs. I’ve followed > numerous examples and they all lead me to the point where I use > hb_buffer_get_glyph_infos to get what I thought would be a hb_glyph_info > object that contains the codepoints for the glyphs I seek. So my first > question is as follows. Is that what I should be getting? I ask because I’m > not getting what I would expect to get. > > > > Yes. > > > > > > I can’t even successfully get a complex glyph to represent the combination > of the letter A and the grave accent. So if I’m just confused as to how or > what HarfBuzz does, please help me find a better path. Thanks! > > > > What do you get? A + grave-accent only forms one glyph if the font was > designed so. It may very well be represented by two glyphs. > > > > _______________________________________________ > HarfBuzz mailing list > [email protected] > https://lists.freedesktop.org/mailman/listinfo/harfbuzz > > > > > -- > > behdad > http://behdad.org/ > > _______________________________________________ > HarfBuzz mailing list > [email protected] > https://lists.freedesktop.org/mailman/listinfo/harfbuzz > > _______________________________________________ > HarfBuzz mailing > [email protected]https://lists.freedesktop.org/mailman/listinfo/harfbuzz > > -- > Bobby de Vos > *[email protected] <[email protected]>* > _______________________________________________ > HarfBuzz mailing list > [email protected] > https://lists.freedesktop.org/mailman/listinfo/harfbuzz
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