全过程解析四级灰度像素编辑器受阻

还有090f4，似乎是一个memcpy函数
？不太清楚用法

@amngis @RH_QDG

08508（VerF）也有点没看懂，源码如下：
008508 6E F4 PUSH XR4
00850A 20 86 MOV R6, R2
00850C 80 03 MOV R3, #128
00850E 0C 83 SRL R3, R0
008510 10 84 MOV R4, R1
008512 00 01 MOV R1, #0
008514 3C 90 SRL R0, #3
008516 18 02 MOV R2, #24
008518 24 F4 MUL ER4, R2
00851A 06 F4 ADD ER4, ER0
00851C 10 90 39 D1 L R0, 0D139h
008520 03 C8 BC NE, 08528h
008522 D4 00 MOV R0, #212
008524 E3 01 MOV R1, #227
008526 02 CE BC AL, 0852Ch
008528 D4 00 MOV R0, #212
00852A DD 01 MOV R1, #221
00852C 46 F0 ADD ER0, ER4
00852E 0A F0 LEA [ER0]
008530 30 90 L R0, [EA]
008532 00 76 CMP R6, #0
008534 02 C8 BC NE, 0853Ah
008536 33 80 OR R0, R3
008538 02 CE BC AL, 0853Eh
00853A FF 43 XOR R3, #255
00853C 32 80 AND R0, R3
00853E 31 90 ST R0, [EA]
008540 2E F4 POP XR4
008542 1F FE RT