Define encode-composition-rule and find-composition
for Emacs 20.4 and the earlier versions. (ps-mule-init-external-library): Just require a feature for external libraries. (ps-mule-prologue): Postscript code modified for new composition. (ps-mule-find-wrappoint): New arg COMPOSITION. (ps-mule-plot-string): Delete code for composite characaters. (ps-mule-plot-composition): New funcion. (ps-mule-prepare-font-for-components): New function. (ps-mule-plot-components): New function. (ps-mule-composition-prologue-generated): Renamed from ps-mule-cmpchar-prologue-generated. (ps-mule-composition-prologue): New named from ps-mule-cmpchar-prologue. Modified for new composition. (ps-mule-plot-rule-cmpchar, ps-mule-plot-cmpchar, ps-mule-prepare-cmpchar-font): Deleted. (ps-mule-string-encoding): New arg NO-SETFONT. (ps-mule-bitmap-prologue): In Postscript code of BuildGlyphCommon, check Composing, not Cmpchar (ps-mule-initialize): Set ps-mule-composition-prologue-generated to nil. (ps-mule-begin-job): Check existence of new composition.
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