<html> <head> <style></style></head> <body class='hmmessage'><div dir='ltr'> <SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">Problem 1:<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN><BR> <SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN><BR> <SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">An common Thai character is composed of 5 parts:<o:p></o:p></SPAN><BR> <SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN><BR> <SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">Preceding vowel [1 optional] + consonant [1 mandatory]+ diacritic vowel [1 optional] + tone mark [1 optional]+ following vowel [2 optional]<o:p></o:p></SPAN><BR> <SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN><BR> <SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">When move cursor, we can move to after “Preceding vowel” or before “following vowel”. <SPAN style="mso-spacerun: yes"> </SPAN>You can’t move to the middle of consonant and diacritic vowel( or tone mark or the composition). <o:p></o:p></SPAN><BR> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><o:p><FONT size=3 face=Calibri> </FONT></o:p></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3><FONT face=Calibri>Special case:<o:p></o:p></FONT></FONT></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3 face=Calibri>SARA_AM can be treated as a special </FONT><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">diacritic vowel</SPAN><FONT face=Calibri><FONT size=3>, it can follow the tone mark.<o:p></o:p></FONT></FONT></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3><SPAN style="FONT-FAMILY: 'Arial','sans-serif'; mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-bidi-font-size: 10.0pt; mso-fareast-language: EN-US">MAITAIKHU </SPAN><SPAN style="mso-ascii-font-family: Calibri; mso-fareast-font-family: 'Times New Roman'; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-bidi-font-size: 10.0pt; mso-fareast-language: EN-US"><FONT face=Calibri>can be treated as </FONT></SPAN></FONT><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">diacritic vowel but can’t follow the </SPAN><FONT size=3><FONT face=Calibri>tone mark<o:p></o:p></FONT></FONT></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3><FONT face=Calibri>THANTHAKHAT can be treated as tone mark<SPAN style="FONT-FAMILY: 'Times New Roman','serif'; FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'"><o:p></o:p></SPAN></FONT></FONT></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><o:p><FONT size=3 face=Calibri> </FONT></o:p></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3 face=Calibri>So I think for the new Thai shaper, the valid composition of “</FONT><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">consonant [1 mandatory]+ diacritic vowel [1 optional] + tone mark [1 optional] “ should be set as same cluster.<o:p></o:p></SPAN></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt"><o:p> </o:p></SPAN></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3><FONT face=Calibri>Problem 2:<o:p></o:p></FONT></FONT></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><o:p><FONT size=3 face=Calibri> </FONT></o:p></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3 face=Calibri>When there is no consonant exist, the dotted circle should be inserted as base character. <SPAN style="mso-spacerun: yes"> </SPAN>The logic should be the first step for the shaping engine to find the invalid combing marks. Refer to </FONT><A href="http://www.microsoft.com/typography/otfntdev/thaiot/shaping.aspx#comb"><FONT color=#0000ff size=3 face=Calibri>http://www.microsoft.com/typography/otfntdev/thaiot/shaping.aspx#comb</FONT></A><o:p></o:p></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><o:p><FONT size=3 face=Calibri> </FONT></o:p></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><o:p><FONT size=3 face=Calibri> </FONT></o:p></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3><FONT face=Calibri>Br,<o:p></o:p></FONT></FONT></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3><FONT face=Calibri>Dean<o:p></o:p></FONT></FONT></P> <BR> </div></body> </html>