On 05/07/2011 01:35 PM, Werner LEMBERG wrote:
Thanks for you suggestions! Working with bytecode instructions must be actively trained, like any other programming language, then the obstacles diminish.
Just for the fun of it, I installed the xgridfit. Learnt and wrote a xgridfit version of the compute_stem_width() function. Porting the pseudo code was fairly straight forward. Xgridfit has quite a rich set of APIs. But the generated code is much longer than your hand craft version, 400+ lines vs 150 lines. A lot of stack management codes.
Xgridfit lost in code size...
<?xml version="1.0"?> <xgridfit xmlns="http://xgridfit.sourceforge.net/Xgridfit2";> <infile>empty.sfd</infile> <outfile>empty2.sfd</outfile> <control-value name="std_width" value="50"/> <function name="stem-width" return="yes"> <param name="width"/> <param name="is_serif"/> <param name="is_round"/> <variable name="dist"/> <variable name="delta"/> <absolute value="width" result-to="dist"/> <if test="is_serif and (dist < (3 * 64))"> <set-equal target="return" source="width"/> <else> <if test="is_round"> <set-equal target="dist" source="64"/> <else> <minimum value1="56" value2="dist" result-to="dist"/> </else> </if> </else> </if> <absolute value="dist - control-value(std_width)" result-to="delta"/> <if test="delta < 40"> <minimum value1="48" value2="control-value(std_width)" result-to="dist"/> <else> <if test="dist < 3 * 64"> <set-equal target="delta" source="dist"/> <floor value="dist" result-to="dist"/> <set-equal target="delta" source="delta - dist"/> <if test="delta < 10"> <add value1="dist" value2="delta" result-to="dist"/> <else><if test="delta < 32"> <set-equal source="dist + 10" target="dist"/> <else><if test="delta < 54"> <set-equal source="dist + 54" target="dist"/> <else> <set-equal source="dist + delta" target="dist"/> </else> </if></else> </if></else> </if> <else> <set-equal source="floor(dist + 32)" target="dist"/> </else> </if> </else> </if> <if test="width < 0"> <set-equal target="dist" source="negative(dist)"/> </if> <set-equal target="return" source="dist"/> </function> <pre-program> </pre-program> </xgridfit>
PUSHB_1 4 FDEF DEPTH PUSHB_1 17 SWAP WS PUSHB_1 19 PUSHB_1 18 RS PUSHB_1 2 ADD WS PUSHB_2 4 0 WS DEPTH PUSHB_1 17 RS SUB PUSHB_1 1 ADD CINDEX ABS PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS DEPTH PUSHB_1 17 RS SUB PUSHB_1 2 ADD CINDEX PUSHB_1 18 RS PUSHB_1 1 ADD RS PUSHB_1 3 PUSHB_1 64 MUL LT AND IF DEPTH PUSHB_1 17 RS SUB PUSHB_1 1 ADD CINDEX PUSHB_1 4 SWAP WS ELSE DEPTH PUSHB_1 17 RS SUB PUSHB_1 3 ADD CINDEX IF PUSHB_1 64 PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS ELSE PUSHB_1 56 PUSHB_1 18 RS PUSHB_1 1 ADD RS MIN PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS EIF EIF PUSHB_1 18 RS PUSHB_1 1 ADD RS PUSHB_1 0 RCVT SUB ABS PUSHB_1 18 RS PUSHB_1 2 ADD SWAP WS PUSHB_1 18 RS PUSHB_1 2 ADD RS PUSHB_1 40 LT IF PUSHB_1 48 PUSHB_1 0 RCVT MIN PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS ELSE PUSHB_1 18 RS PUSHB_1 1 ADD RS PUSHB_1 3 PUSHB_1 64 MUL LT IF PUSHB_1 18 RS PUSHB_1 1 ADD RS PUSHB_1 18 RS PUSHB_1 2 ADD SWAP WS PUSHB_1 18 RS PUSHB_1 1 ADD RS FLOOR PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS PUSHB_1 18 RS PUSHB_1 2 ADD RS PUSHB_1 18 RS PUSHB_1 1 ADD RS SUB PUSHB_1 18 RS PUSHB_1 2 ADD SWAP WS PUSHB_1 18 RS PUSHB_1 2 ADD RS PUSHB_1 10 LT IF PUSHB_1 18 RS PUSHB_1 1 ADD RS PUSHB_1 18 RS PUSHB_1 2 ADD RS ADD PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS ELSE PUSHB_1 18 RS PUSHB_1 2 ADD RS PUSHB_1 32 LT IF PUSHB_1 18 RS PUSHB_1 1 ADD RS PUSHB_1 10 ADD PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS ELSE PUSHB_1 18 RS PUSHB_1 2 ADD RS PUSHB_1 54 LT IF PUSHB_1 18 RS PUSHB_1 1 ADD RS PUSHB_1 54 ADD PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS ELSE PUSHB_1 18 RS PUSHB_1 1 ADD RS PUSHB_1 18 RS PUSHB_1 2 ADD RS ADD PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS EIF EIF EIF ELSE PUSHB_1 18 RS PUSHB_1 1 ADD RS PUSHB_1 32 ADD FLOOR PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS EIF EIF DEPTH PUSHB_1 17 RS SUB PUSHB_1 1 ADD CINDEX PUSHB_1 0 LT IF PUSHB_1 18 RS PUSHB_1 1 ADD RS NEG PUSHB_1 18 RS PUSHB_1 1 ADD SWAP WS EIF PUSHB_1 18 RS PUSHB_1 1 ADD RS PUSHB_1 4 SWAP WS POP POP POP ENDF
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