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| 1 | ; asmutil.asm Color key bit blitting for DirectDraw
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| 2 | ;
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| 3 | ; Copyright 1998 Sander van Leeuwen (sandervl@xs4all.nl)
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| 4 | ; *
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| 5 | ; * Project Odin Software License can be found in LICENSE.TXT
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| 6 | ; *
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| 7 | ;
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| 8 |
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| 9 | .386p
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| 10 | NAME asmutil
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| 11 |
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| 12 | CODE32 SEGMENT DWORD PUBLIC USE32 'CODE'
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| 13 | ASSUME CS:FLAT ,DS:FLAT,SS:FLAT
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| 14 |
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| 15 | PUBLIC _BlitColorKey8
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| 16 |
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| 17 | ; endpos = destbuf + blitlinesize;
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| 18 | ; while(destbuf < endpos) {
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| 19 | ; if(*srcbuf == colorkey) {
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| 20 | ; destbuf++;
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| 21 | ; }
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| 22 | ; else *destbuf++ = *srcbuf;
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| 23 | ; srcbuf++;
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| 24 | ; }
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| 25 | ; destbuf += (destscanlinesize-blitlinesize);
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| 26 | ; srcbuf += (srcscanlinesize-blitlinesize);
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| 27 | ;void BlitColorKey8(char *dest, char *src, ULONG key, ULONG linesize)
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| 28 | _BlitColorKey8 PROC NEAR
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| 29 | push ebp
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| 30 | mov ebp, esp
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| 31 | push edi
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| 32 | push esi
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| 33 | push eax
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| 34 | push ebx
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| 35 | push ecx
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| 36 | push edx
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| 37 |
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| 38 | mov edi, dword ptr [ebp+8] ;dest
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| 39 | mov esi, dword ptr [ebp+12] ;src
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| 40 | mov ecx, dword ptr [ebp+20] ;linesize
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| 41 | mov edx, dword ptr [ebp+16] ;colorkey
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| 42 |
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| 43 | and ecx, 3
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| 44 | push ecx ;do the remaining bytes afterwards
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| 45 | mov ecx, dword ptr [ebp+20] ;linesize
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| 46 | shr ecx, 2 ;linesize in dwords
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| 47 |
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| 48 | ALIGN 16
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| 49 |
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| 50 | blitloop:
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| 51 | mov ebx, dword ptr [esi]
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| 52 | mov eax, dword ptr [edi]
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| 53 | cmp bl, dl
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| 54 | je skipbyte1
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| 55 | mov al, bl
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| 56 |
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| 57 | skipbyte1:
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| 58 | cmp bh, dl
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| 59 | je skipbyte2
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| 60 | mov ah, bh
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| 61 | skipbyte2:
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| 62 | ror eax, 16
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| 63 | ror ebx, 16
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| 64 | cmp bl, dl
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| 65 | je skipbyte3
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| 66 | mov al, bl
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| 67 | skipbyte3:
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| 68 | cmp bh, dl
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| 69 | je skipbyte4
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| 70 | mov ah, bh
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| 71 | skipbyte4:
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| 72 | ror eax, 16
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| 73 | dec ecx
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| 74 | mov dword ptr [edi], eax
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| 75 | add esi, 4
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| 76 | add edi, 4
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| 77 |
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| 78 | cmp ecx, 0
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| 79 | jne blitloop
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| 80 |
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| 81 | pop ecx
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| 82 | cmp ecx, 0
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| 83 | je endofblit
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| 84 |
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| 85 | blitperbyte:
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| 86 | mov al, byte ptr [esi]
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| 87 | dec ecx
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| 88 | cmp al, dl
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| 89 | je skipsinglebyte
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| 90 | mov byte ptr [edi], al
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| 91 | skipsinglebyte:
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| 92 | inc esi
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| 93 | inc edi
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| 94 | cmp ecx, 0
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| 95 | jne blitperbyte
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| 96 |
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| 97 | endofblit:
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| 98 | pop edx
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| 99 | pop ecx
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| 100 | pop ebx
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| 101 | pop eax
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| 102 | pop esi
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| 103 | pop edi
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| 104 | pop ebp
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| 105 | ret
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| 106 | _BlitColorKey8 ENDP
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| 107 |
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| 108 | CODE32 ENDS
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| 109 |
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| 110 | END
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