<html><head></head><body>I doubt this mod will end up in the a regression of positioning prebase matra in front of ligated cillu. I have seen Uniscribe too disregarding the pres rules. Not sure about its present status. -suresh <div class="gmail_quote">On 11 September 2014 14:36:37 GMT+05:30, Uvaraja Pandian <p.uvaraja@gmail.com> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div dir="ltr">Hi Team, We are using the Harfbuzz 0.9.34 version. While rendering the Malayalam string using the Harfbuzz and Freetype engine, we see some issues. String used: ക്കേUnicode value: 0x0d15, 0x0d4d, 0x0d15, 0x0d47, 0x0000 Harfbuzz Output:<img width="123" height="64" src="content://com.fsck.k9.attachmentprovider/eca1b9c8-2839-44ec-aeed-027f5ebd5d4e/35/RAW" /> Proper Output :<img width="69" height="45" src="content://com.fsck.k9.attachmentprovider/eca1b9c8-2839-44ec-aeed-027f5ebd5d4e/36/RAW" /> Font File used: Akruti Family, Since this is a licensed font file, we are not able to share it. Issue in Detail: In the font file,script mlym { # Malayalam feature Akhands; feature BelowBaseSubstitutions; feature HalfForms; feature PostBaseForms; feature PostBaseSubstitutions; feature PreBaseSubstitutions;} As per the Harfbuzz implementation, below substitution is happening as part of the HalfForms ,0x0d15 & 0x0d4d è XYZ character, so the output is XYZ, 0x0d15, 0x0d47 Final re-ordering happens and rearranges as below,XYZ, 0x0d15, 0x0d47 è XYZ, 0x0d47, 0x0d15 As per the PreBaseSubstitutions,XYZ & 0x0d15 is not matched and the output is not proper. In-Order to solve this issue, below changes has been done, Final Re-ordering,PSB for the code changes As per the PreBaseSubstitutions,XYZ & 0x0d15 forms the final character. Code Modifications:In the file hb-ot-shape-complex-indic.cc, if we modify the lines as below in the function final_reordering_syllable() it is working, if (start + 1 < end && start < base) /* Otherwise there can't be any pre-base matra characters. */ { /* If we lost track of base, alas, position before last thingy. */ unsigned int new_pos = base == end ? base - 2 : base - 1; /* Malayalam / Tamil do not have "half" forms or explicit virama forms. * The glyphs formed by 'half' are Chillus or ligated explicit viramas. * We want to position matra after them. */ if (buffer->props.script != HB_SCRIPT_MALAYALAM && buffer->props.script != HB_SCRIPT_TAMIL) { …<s> }</s> if (start < new_pos && info[new_pos].indic_position () != POS_PRE_M) { … } else { … } } } Please comment, will it have any side effect. Best Regards,Uvaraja P.Sindhura P.</div> <pre class="k9mail"><hr /> HarfBuzz mailing list HarfBuzz@lists.freedesktop.org <a href="http://lists.freedesktop.org/mailman/listinfo/harfbuzz">http://lists.freedesktop.org/mailman/listinfo/harfbuzz</a> </pre></blockquote></div></body></html>