HarfBuzz text shaping engine
http://harfbuzz.github.io/
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259 lines
10 KiB
259 lines
10 KiB
digraph { |
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graph [outputorder=edgefirst]; |
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node [shape="record", fontname="Noto Sans Mono SemiBold", fontsize=15]; |
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edge [fontname="Verdana", fontsize=12,labeldistance=7.5 ]; |
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fontname="Verdana"; |
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ranksep=0.02; nodesep=0.5; |
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subgraph { |
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ranksep="0.02 equally"; |
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preprocessing[style=filled,fillcolor="lightgreen",fontname="Verdana",label="Glyph pre-processing"]; |
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orthographic[style=filled,fillcolor="lightblue",fontname="Verdana",label="Orthographic Unit Shaping"]; |
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reordering[style=filled, fillcolor="lightcoral",fontname="Verdana",label="Reordering group (USE)"]; |
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topographic[style=filled,fillcolor="lightgoldenrod",fontname="Verdana",label="Topographical Features‡"]; |
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typographic[style=filled,fillcolor="lightpink",fontname="Verdana",label="Typographic Presentation"]; |
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positioning[style=filled,fillcolor="lightsalmon",fontname="Verdana",label="Positioning"]; |
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preprocessing->reordering->orthographic->topographic->typographic->positioning; |
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} |
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decision1 [shape="diamond", label="Script\ndirection?",fontname="Verdana"]; |
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rvrn->decision1; |
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ltrfeatures [label="{ltra|ltrm}", fillcolor="lightgreen",style="filled"]; |
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{ |
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rtlfeatures [label="{rtla|rtlm¹}", fillcolor="lightgreen",style="filled"]; |
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} |
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{ |
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rank=same; |
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fracfeatures [label="frac²|numr³|dnom⁴", fillcolor="lightpink",style="filled"]; |
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fracnotes [fontname="Verdana",shape=plaintext,label=<<table border="0" cellborder="0" cellspacing="0"> |
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<tr><td align="left">¹ rtlm is scoped to characters with a Unicode mirroring property</td></tr> |
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<tr><td align="left">² frac is scoped to numr + the slash + dnom</td></tr> |
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<tr><td align="left">³ numr is scoped to all decimal numbers before a U+2044 FRACTION SLASH.</td></tr> |
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<tr><td align="left">⁴ dnom is scoped to all decimal numbers after a U+2044 FRACTION SLASH.</td></tr> |
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</table> |
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>]; |
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} |
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rand [fillcolor="lightpink",style="filled"]; |
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decision1 -> ltrfeatures [label="Left-to-right"]; |
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decision1 -> rtlfeatures [label="Right-to-left"]; |
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decision1 -> fracfeatures [label="Other"]; |
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ltrfeatures -> fracfeatures; |
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rtlfeatures -> fracfeatures; |
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fracfeatures->rand; |
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decision2 [shape="diamond", label="Script?",fontname="Verdana"]; |
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{rank=same; HARF [label="{Harf|HARF}"]; notes;} |
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rand -> trak -> HARF -> decision2; |
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commonfeatures [shape=none,label=<<table border="0" cellspacing="0"> |
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<tr> |
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<td border="1" bgcolor="lightsalmon">abvm</td> |
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<td border="1" bgcolor="lightsalmon">blwm</td> |
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<td border="1" bgcolor="lightgreen">ccmp</td> |
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<td border="1" bgcolor="lightgreen">locl</td> |
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<td border="1" bgcolor="lightsalmon">mark</td> |
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<td border="1" bgcolor="lightsalmon">mkmk</td> |
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<td border="1" bgcolor="lightpink">rlig</td> |
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</tr> |
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</table>> |
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]; |
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decision3 [shape="diamond", label="Script\ndirection?",fontname="Verdana"]; |
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BUZZ [label="{Buzz|BUZZ}"]; |
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BUZZ -> commonfeatures -> decision3; |
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horizontalfeatures [ |
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shape=none,label=<<table border="0" cellspacing="0"> |
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<tr><td border="1" bgcolor="lightpink">calt <font face="Verdana">(not Hangul)</font></td></tr> |
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<tr><td border="1" bgcolor="lightpink">clig <font face="Verdana">(not Khmer)</font></td></tr> |
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<tr><td border="1" bgcolor="lightsalmon">curs</td></tr> |
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<tr><td border="1" bgcolor="lightsalmon">dist</td></tr> |
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<tr><td border="1" bgcolor="lightsalmon">kern</td></tr> |
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<tr><td border="1" bgcolor="lightpink">liga <font face="Verdana">(not Khmer)</font></td></tr> |
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<tr><td border="1" bgcolor="lightpink">rclt</td></tr> |
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</table>> |
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]; |
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vert [label="vert",style=filled,fillcolor="lightpink"]; |
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decision3 -> horizontalfeatures [label="Horizontal"]; |
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decision3 -> vert [label="Vertical"]; |
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discretionary [label="User-selected\ndiscretionary\nfeatures",fontname="Verdana"]; |
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horizontalfeatures -> discretionary; |
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vert -> discretionary; |
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decision2->stch; |
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BUZZ; |
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subgraph shapers { |
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subgraph cluster_arabic { |
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bgcolor="lightyellow" |
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label="Arabic, Syriac"; |
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stch [ style="filled", fillcolor="lightgreen",label="stch"]; |
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ccmplocl [ style="filled", label="ccmp|locl", fillcolor="lightgreen"]; |
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arabicfeatures [label="isol|fina|fin2|fin3|medi|med2|init", style="filled", fillcolor="lightgoldenrod"]; |
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arabicfeatures2 [label="rclt|calt", style="filled",fillcolor="lightpink"]; |
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rlig[style="filled",fillcolor="lightpink"]; |
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mset [fillcolor="lightpink",style="filled"] |
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stch->ccmplocl->arabicfeatures->rlig->arabicfeatures2->mset; |
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} |
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mset->BUZZ:n; |
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subgraph cluster_hangul { |
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bgcolor="lightyellow" |
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label="Hangul"; |
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hangulfeatures [label="ljmo|vjmo|tjmo", style="filled",fillcolor="lightgoldenrod"] |
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} |
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hangulfeatures->BUZZ:n; |
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subgraph cluster_indic { |
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label="Indic"; |
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bgcolor="lightyellow" |
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// Preprocessing |
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loclccmpindic [label="locl†|ccmp†",style=filled,fillcolor="lightgreen"]; |
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node[style=filled,fillcolor="lightgreen"]; |
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nukt [label="nukt†"]; |
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akhn [label="akhn†"]; |
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loclccmpindic->indic_reorder_1->nukt->akhn; |
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indic_reorder_1[label="Initial reordering", fontname="Verdana",fillcolor="lightgrey",shape=ellipse,style=filled] |
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// Orthographic |
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node[style=filled,fillcolor="lightblue"] |
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rphf [label="rphf⁵"]; |
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rkpf [label="rkpf†"]; |
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pref [label="pref⁶"]; |
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blwf [label="blwf⁷"]; |
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abvf [label="abvf⁸"]; |
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half [label="half⁹"]; |
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pstf [label="pstf⁸"]; |
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vatu [label="vatu†"]; |
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cjct [label="cjct†"]; |
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akhn ->rphf -> rkpf -> pref -> blwf -> abvf -> half -> pstf -> vatu -> cjct; |
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// Typographic presentation |
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indic_typographic[style=filled,fillcolor="lightpink",label="init|pres|abvs|blws|psts|haln"] |
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indic_reorder_2[label="Final reordering",fillcolor="lightgrey",fontname="Verdana", shape=ellipse,style=filled] |
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cjct->indic_reorder_2->indic_typographic; |
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notes2 [fontname="Verdana",shape=plaintext,style="",label=<<table border="0" cellborder="0" cellspacing="0"> |
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<tr><td align="right">⁵ rphf is scoped to pre-base ra+halant sequences</td></tr> |
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<tr><td align="right">⁶ pref is scoped to the two glyphs after the base; outputs are reordered</td></tr> |
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<tr><td align="right">⁷ blwf is usually scoped to the whole syllable, except in Telugu and Kannada where it is post-base</td></tr> |
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<tr><td align="right">⁸ abvf and pstf are scoped to post-base</td></tr> |
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<tr><td align="right">⁹ half is scoped to pre-base</td></tr> |
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</table> |
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>]; |
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indic_typographic -> notes2 [style=invis]; |
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} |
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subgraph cluster_khmer { |
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label="Khmer"; |
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bgcolor="lightyellow" |
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khmerbasic [style=filled,fillcolor="lightgreen",label="locl†|ccmp†|pref†|bwlf†|abvf†|pstf†|cfar†"] |
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khmerother [style=filled,fillcolor="lightpink",label="pres|abvs|blws|psts"] |
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khmerbasic -> khmerother -> khmerclig; |
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khmerclig [label="clig",style=filled,fillcolor="lightpink"]; |
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} |
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subgraph cluster_myanmar { |
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label="Myanmar"; |
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bgcolor="lightyellow" |
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loclccmpmyanmar [label="locl†|ccmp†",style=filled,fillcolor="lightgreen"]; |
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rphfmymr [label="rphf†",style=filled,fillcolor="lightblue"] |
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prefmymr [label="pref†",style=filled,fillcolor="lightblue"] |
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blwfmymr [label="blwf†",style=filled,fillcolor="lightblue"] |
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pstfmymr [label="pstf†",style=filled,fillcolor="lightblue"] |
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myanmarother [label="pres|abvs|blws|psts",style=filled,fillcolor="lightpink"]; |
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reorder_myanmar[label="Reordering", shape=ellipse,style=filled,fontname="Verdana"] |
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loclccmpmyanmar -> reorder_myanmar-> rphfmymr -> prefmymr -> blwfmymr -> pstfmymr -> myanmarother; |
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} |
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subgraph cluster_use { |
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label="Universal Shaping Engine" |
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bgcolor="lightyellow" |
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use_preprocessing [style=filled, label="locl†|ccmp†|nukt†|akhn†", fillcolor="lightgreen"]; |
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// Reoredering |
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rphfuse [label="rphf¹⁰", style=filled, fillcolor="lightcoral"]; |
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prefuse [label="pref¹¹", style=filled, fillcolor="lightcoral"]; |
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// Orthographic |
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orthographicuse [label="rkrf†|abvf†|blwf†|half†|pstf†|vatu†|cjct†", style="filled", fillcolor="lightblue"]; |
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topographicaluse [label="isol|init|medi|fina", style="filled", fillcolor="lightgoldenrod"]; |
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typographicaluse [label="abvs|blws|haln|pres|psts", style="filled", fillcolor="lightpink"]; |
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reorder_use[label="Reordering", shape=ellipse,style=filled,fontname="Verdana"] |
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use_preprocessing -> rphfuse -> prefuse->orthographicuse ->reorder_use -> topographicaluse -> typographicaluse; |
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notes3 [fontname="Verdana",shape=plaintext,label=<<table border="0" cellborder="0" cellspacing="0"> |
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<tr><td align="left">¹⁰ Outputs are reordered as category R</td></tr> |
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<tr><td align="left">¹¹ Outputs are reordered to before base</td></tr> |
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</table> |
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>]; |
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typographicaluse -> notes3 [style=invis]; |
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} |
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} |
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indic_typographic->BUZZ:n; |
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typographicaluse->BUZZ:n; |
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khmerclig -> BUZZ:n; |
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myanmarother -> BUZZ:n; |
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decision2->hangulfeatures; |
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decision2->loclccmpindic; |
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decision2->khmerbasic; |
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decision2->loclccmpmyanmar; |
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decision2->use_preprocessing; |
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decision2->BUZZ [label=" Hebrew, Thai,\n Lao, other"]; |
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notes [fontname="Verdana",shape=box,label=<<table border="0" cellborder="0" cellspacing="0"> |
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<tr><td align="left"> |
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<b>Indic</b> scripts are: Bengali, Devanagari, |
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Gujarati, Gurmukhi, Kannada, |
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Malayalam, Oriya, Tamil, |
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Telugu |
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</td></tr> |
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<tr><td align="left"> |
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<b>USE</b> scripts are: |
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Adlam, Ahom, Balinese, Batak, Bhaiksuki, Brahmi, Buginese, |
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Buhid, Chakma, Cham, Chorasmian, Dives Akuru, Dogra, Duployan, |
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</td></tr> |
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<tr><td align="left"> |
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Egyptian hieroglyphs, Elymaic, Grantha, Gunjala Ggondi, Hanifi Rohingya, |
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Hanunoo, Javanese, Kaithi, Kayah li, Kharoshthi, Khojki, |
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</td></tr> |
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<tr><td align="left"> |
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Khudawadi, Lepcha, Limbu, Mahajani, Makasar, Mandaic, Manichaean, |
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Marchen, Masaram Gondi, Medefaidrin, Meetei Mayek, Miao, Modi, |
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</td></tr> |
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<tr><td align="left"> |
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Mongolian, Multani, Nandinagari, Newa, Nko, Nyiakeng Puachue Hmong, |
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Old Sogdian, Pahawh Hmong, Phags Pa, Psalter Pahlavi, Rejang, |
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</td></tr> |
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<tr><td align="left"> |
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Saurashtra, Sharada, Siddham, Sinhala, Sogdian, Soyombo, Sundanese, |
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Syloti Nagri, Tagalog, Tagbanwa, Tai Le, Tai Tham, Tai Viet, |
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</td></tr> |
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<tr><td align="left"> |
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Takri, Tibetan, Tifinagh, Tirhuta, Wancho, Zanabazar square, |
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</td></tr> |
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</table>>] |
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footnote[fontname="Verdana",label=<<table border="0" cellborder="0" cellspacing="0"> |
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<tr><td align="left">† Feature is scoped to each syllable</td></tr> |
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<tr><td align="left">‡ All topographic features are scoped based on topographic position</td></tr> |
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</table>>]; |
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notes3->footnote[style=invis]; |
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}
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