Thanks for the answear. I found that Freetype and Harfbuzz don't give the same advance for some glyph. Since I guess it's only looking to the font setting, how is that possible? I guess Harfbuzz is doing more than just looking to the font, I should use his advance then. <div class="gmail_quote">2009/12/4 Lars Knoll <<a href="mailto:lars.knoll@nokia.com">lars.knoll@nokia.com</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> On Friday 04 December 2009 08:21:16 am Nicolas Lacombe wrote: > problem solved: [snip] <div class="im"> > I'm still having problem rendering complexe sentances, but it looks like > working fine on small letter... I'm wondering if I have to take into > account the advances given by the shaper... for now I'm just letting > freetype taking care of it for me... need some test. </div>There's a reason harfbuzz delivers you advances and positions for the glyphs ;-) You'll need to use them to get correct layout. <div class="im"> > Are you aware of any problem in the arabic/syriac translation module, or is > it suppose to work fine? </div>We're using the code directly in Qt and haven't gotten any bug reports about problems with arabic or syriac for quite some time. Cheers, Lars <div><div></div><div class="h5"> > > Behdad answear to this question with: > > "Supposed to work fine. Though you need a bidi engine also. Try setting > bidi level to 1 instead of 0..." > > > Wich does not appear to change a lot of things. However I resolved my > problem by changing font... they are very important, and I'm having trouble > to find good Persian and Syriac font. > > > > 2009/12/2 Nicolas Lacombe <<a href="mailto:n.lacombe@gmail.com">n.lacombe@gmail.com</a>> > > > Hi, > > > > I'm using HarfBuzz with freetype to render arabic text. I must say that > > this library was exactly what I was looking for, great job! > > > > Anyway I spotted something strange, I don't know if it's a bug or if it's > > me that didn't understand correctly the spirit behind Harfbuzz. > > > > When rendering arabic letter equivalent of la , it should give me only > > one glyph (لا). > > > > However, Harfbuzz render me correctly the glyph, but do not get rid of > > the a. See screenshot here: > > > > <a href="http://img522.yfrog.com/i/21856341.png/" target="_blank">http://img522.yfrog.com/i/21856341.png/</a> > > > > > > Here's my (simplified) render loop: > > > > HB_ShaperItem shaper_item; > > > > shaper_item.string = (HB_UChar16 *) g_utf8_to_utf16((gchar*)txt, -1, > > NULL, &numberOfWords, NULL); > > > > shaper_item.kerning_applied = 0; > > shaper_item.stringLength = 0; > > shaper_item.shaperFlags = 0; > > shaper_item.font = &hbFont; > > shaper_item.face = hbFace; > > shaper_item.glyphIndicesPresent = 0; > > shaper_item.initialGlyphCount = 0; > > > > shaper_item.item.bidiLevel = 0; > > > > out_glyphs = (HB_Glyph*)malloc(numberOfWords * sizeof(HB_Glyph)); > > memset(out_glyphs, 0, numberOfWords * sizeof(HB_Glyph)); > > out_attrs = (HB_GlyphAttributes*)malloc(numberOfWords * > > sizeof(HB_GlyphAttributes)); > > memset(out_attrs, 0, numberOfWords * sizeof(HB_GlyphAttributes)); > > out_advs = (HB_Fixed*)malloc(numberOfWords * sizeof(HB_Fixed)); > > memset(out_advs, 0, numberOfWords * sizeof(HB_Fixed)); > > out_offsets = (HB_FixedPoint*)malloc(numberOfWords * > > sizeof(HB_FixedPoint)); > > memset(out_offsets, 0, numberOfWords * sizeof(HB_FixedPoint)); > > out_logClusters = (unsigned short*)malloc(numberOfWords * > > sizeof(unsigned short)); > > memset(out_logClusters, 0, numberOfWords * sizeof(unsigned short)); > > > > shaper_item.glyphs = out_glyphs; > > shaper_item.attributes = out_attrs; > > shaper_item.advances = out_advs; > > shaper_item.offsets = out_offsets; > > shaper_item.log_clusters = out_logClusters; > > shaper_item.num_glyphs = numberOfWords; > > shaper_item.stringLength = numberOfWords; > > > > int l = 0; > > while(1){ > > > > shaper_item.num_glyphs = numberOfWords; > > if (!hb_utf16_script_run_next(NULL, &shaper_item.item, > > shaper_item.string, numberOfWords , &iterator)) > > break; > > > > memset(out_glyphs, 0, numberOfWords * sizeof(HB_Glyph)); > > HB_ShapeItem(&shaper_item); > > for (unsigned int j = 0; j < shaper_item.item.length; j++) > > { > > ind[l++] = out_glyphs[j]; > > } > > } > > > > so at the end, ind contains all the index of the glyph I need to draw. > > > > Is there a way harfbuzz can tell me to get rid of a glyph? > > > > Thanks, Nico. > </div></div>_______________________________________________ HarfBuzz mailing list <a href="mailto:HarfBuzz@lists.freedesktop.org">HarfBuzz@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/harfbuzz" target="_blank">http://lists.freedesktop.org/mailman/listinfo/harfbuzz</a> </blockquote></div>