[FWD] Re: 也談漢字的快速顯示

[hateme212@hotmail.com (x--- ROT-13 First!! -=Hateme=-)]

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From: "Miao YuCheng" <helios@online.sh.cn>
Newsgroups: chinese.comp.linux.development
Subject: ¤]½Íº~¦rªº§Ö³tÅã¥Ü
Date: Fri, 17 Dec 1999 22:30:33 +0800


[posted and mailed]

On 17 Dec 1999, you wrote in chinese.comp.linux.development:

>³Ìªñ¥¿¦b¬ÝMichael Abrash's Graphics Programming¶Â¥Ö®Ñ,
>²`¨ü±Òµo. Áp¨t¥H«e¹ïyact, cce¤@¨Çº~Åã¾÷²zªº¤F¸Ñ, °µ¤F
>¤@¨Ç¸ÕÅç, µo²{¦pªG¥Î¼g¼Ò¦¡3Á׶}out«ü¥Oªº¸Ü, ¥i¥H¨Ï³æ¦r
>Åã¥Üªº³t«×©úÅã¥[§Ö. °µ¤F¤@¤U¤ñ¸û, ¥Î³q±`·N¸q¤Wªº§Ö³t¤è
>ªk, §Y³q¹L¨C¦¸¼g¦ì«Ì½ª±H¦s¾¹Åã¥Ü8­Ópixelªº¤è®×³Ì¤Ö¤]­n
>15000microseconds(1 microseconds = 1000 ns), ¦Ó¥Î¼g¼Ò
>¦¡3¥i¥H¹F¨ì5000microsendsªº³t«×¥H³æ¦rÅã¥Ü½Õ¥Î¼gº¡¥þ«Ì
>(§Y¤Ï´_½Õ¥Î¤ñ¦pwrite_hanzi³o¼Ë¤@­ÓÅã¥Ü³æ¦rªº¹Lµ{²Kº¡«Ì
>¹õ, ¤]´N¬O¥]¬A¤Fpush, popªº®É¶¡, ¦pªG¼g¦b¤@­Ó¹Lµ{¤¤ªÖ©w
>·|§ó§Ö¤@ÂI). ¦pªG»¡¼g¼Ò¦¡3¥Îªº¤£¦hªº­ì¦]¦b¤_©MEGA¤£­Ý®e
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>EGA¶¡ªº­Ý®e©Ê¤F§a. §Ú­×§ï¤Fcce¤¤ªºÅã¥Üascii¦r²Åªº¹Lµ{,
>­«·s½sĶ¦Z, ´ú¸Õ¤F¤@¤UÅã¥Üyact·½½X¤¤test¥Ø¿ý¤Uªº¤L­Ó
>ASCII ART ¤å¥ó, ¤ñ¦pearth(¥ÎASCII¦r²Åµe¤@­Ó±ÛÂ઺¦a²y,
>ÁÙ¦³³\¦h¨ä¥L¦nª±ªºªF¦è, ¦p¸t½Ï°Êµeµ¥, «Ü¸g¨å),
>³t«×©úÅã§Ö¤F³\¦h, ©Mgce¬Û¤ñÁÙ¬O§Ö(·Q¨Ó, gce¤£·|¬O¥Î¼g¼Ò
>¦¡3Åã¥Ü¦r²Åªº). ¦ý¦b¤å¥ó¤ñ¸û¦hªº¥Ø¿ý¤U°õ¦æ¤@¦¸lsµo²{¨S
>¦³©úÅ㪺³t«×¼W¥[, cce¤§©Ò¥HºC¬Ý¨Ó­nÂk©S¤_¨÷«Ìªº°ÝÃD¤F,
>cce³q¹L«þ¨©Åã¦s¹ê²{¨÷«Ì, ¬ù­n¥e¥h40000microsecondsªº®É
>¶¡, ©MÅã¥Ü¤@¾ã«Ìº~¦r¬Û¤ñ, Àu¤Æ¦Z³t«×µL©Ç¨S¦³©úÅ㪺¼W¥[.
>¦Ò¼{¥Î°_©l¦æ±½´y±H¦s¾¹(¦ô­pgce¤]¬O³o¤\°µªº), ÁÙ¬O¦³¨Ç°Ý
>ÃDªº, ¤@¬O­­¤_64K¬M®gÅã¦sªº­­¨î, ¬ù¥u¯à¨÷18¦æ, 18¦æ¦ZÁÙ
>¬O­n¦³¤@¦¸¤j¶qªºÅã¦s--Åã¦s«þ¨©, ¦pªG¯àÁקK, ·íµM³Ì¦n.
>¤G¬O¥Î°_©l±½´y±H¦s¾¹ªº¸Ü, ¨C¦¸¨÷«Ì, ³£­n­«µeª¬ºA±ø, ¸Ó
>¦p¦óÁקK? ©î¤À«Ì¹õ¬O§_¯à¸Ñ¨M¦¹°ÝÃD. ¦pªG¤W­z¨âªÌ³£¤£¯à
>ÁקKªº¸Ü, ¦ôºâ¤F¤@¤U, ¨C¨÷«Ì18¦æ, ¥­§¡¨C¦¸¨÷«Ì©Ò¤Æ®É¶¡
>4500microseconds, ÁöµMÁÙ¬O»·»·¤p¤_cceªº®É¶¡, ¦ý«o¤£¬O
>³Ì²z·Qªº. §Ú¦b³o¨½°Q½×, §Æ±æ¦³¹Lº~¦r©Î¹Ï§Î½sµ{¸gÅ窺ªB
>¤Í¯à»¡»¡¸Ñ¨M¤§¹D.
>
>¥tªþ§Q¥Î¼g¼Ò¦¡3¹ê²{³æ¦rÅã¥Üªº¹Lµ{:
>#void hz16_draw (int row, int col, char** hzbm);
>#row -- ¦æ
>#col -- ¦C
>#hzbm - º~¦r¦ì¹Ï
>
>hz16_draw:
>     pushl %ebp
>     movl %esp, %ebp
>     pushl %ecx
>     pushl %edx
>     pushl %esi
>     pushl %edi
>
>    # ¥Îoffset_tableªíªº¤èªk¼W¥[³t«×,
>    # µ¥®Ä¤_¤U­±ª`ÄÀªº¥N½X
>     movl 8(%ebp), %eax
>     shll $2, %eax
>     movl offset_table(%eax), %edi
>     movl 12(%ebp),%edx
>     shll $1, %edx
>     addl %edx, %edi
>
>    # simpliest but slowest
>    # movl 8(%ebp), %eax
>    # imul $1440, %eax
>    # movl %eax, %edi
>
>    movl 16(%ebp), %esi
>    addl graph_mem, %edi
>
>    #draw background
>     movw $0x3CE, %dx
>     movw $0xf00, %ax # replace 0xf with background
>     outw %ax, %dx
>
>     movw $0xffff, (%edi)
>
>    #draw foreground
>     movw $0x0000, %ax # replace 0x0 with foreground
>     outw %ax, %dx
>
>    # º¾¦s¾¹¤¤³£¬O¤@¼Ëªº­È, ¬G¥u¸Ë¤J¤@¦¸
>    # ¸`¬ù2000microseconds :-)
>     movw (%edi), %ax
>     movl $18, %ecx
>draw2:
>     movw (%esi), %ax
>     movw %ax, (%edi)
>     addl $80, %edi
>     inc %esi
>     inc %esi
>     loop draw2
>
>     popl %edi
>     popl %esi
>     popl %edx
>     popl %ecx
>     popl %ebp
>     ret
>
>
>
>


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