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- ; VirtualDub - Video processing and capture application
- ; Copyright (C) 1998-2001 Avery Lee
- ;
- ; This program is free software; you can redistribute it and/or modify
- ; it under the terms of the GNU General Public License as published by
- ; the Free Software Foundation; either version 2 of the License, or
- ; (at your option) any later version.
- ;
- ; This program is distributed in the hope that it will be useful,
- ; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ; GNU General Public License for more details.
- ;
- ; You should have received a copy of the GNU General Public License
- ; along with this program; if not, write to the Free Software
- ; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- .386
- .model flat
- .code
-
- public _asm_threshold_run
-
- ;asm_threshold_run(
- ; [esp+ 4] void *dst,
- ; [esp+ 8] ulong width,
- ; [esp+12] ulong height,
- ; [esp+16] ulong stride,
- ; [esp+20] ulong threshold);
- ;
- ; This code is based off of the grayscale code. See a_grayscale.asm for
- ; further info.
-
- _asm_threshold_run:
- push ebp
- push edi
- push esi
- push edx
- push ecx
- push ebx
- push eax
-
- mov esi,[esp+ 4+28]
- mov ebp,[esp+12+28]
-
- mov eax,[esp+20+28]
- mov ebx,80000000h
- shl eax,8
- sub ebx,eax
- push ebx
-
-
- threshold@rowloop:
- push ebp
- mov ebp,[esp+ 8+36]
-
- push esi
- threshold@colloop:
- mov eax,[esi] ;1u EAX=?.R.G.B
- xor ebx,ebx ;1v EBX=0
- mov edx,eax ;2u EDX=?.R.G.B
- and eax,00ff00ffh ;2v EAX=[R][B]
- mov bl,dh ;3u EBX=[][G]
- mov edi,eax ;3v EDI=[R][B]
- xor ecx,ecx ;4u ECX=0
- lea edx,[eax+8*eax] ;4v EDX=[R*9][B*9]
- lea ecx,[ebx+2*ebx] ;5u ECX=[G*3]
- lea ebx,[ebx+8*ebx] ;5v EBX=[G*9]
- shl ecx,6 ;6u ECX=[G*192]
- lea eax,[edx+2*edx] ;6v EAX=[R*27][B*27]
- lea edi,[edi+2*edx] ;7u EDI=[R*19][B*19]
- sub ecx,ebx ;7v ECX=[183*G]
- shr eax,15 ;8u EAX=[54*R]
- add ecx,edi ;8v ECX=[183*G+19*B]
- add eax,ecx ;9u EAX=54*R+183*G+19*B
- add esi,4 ;9v
- and eax,0000ffffh ;10u
- add eax,[esp+8] ;11u
- sar eax,31 ;12u
- dec ebp ;12v
- mov [esi-4],eax ;13u
- jne threshold@colloop ;13v
-
- pop esi
-
- pop ebp
- add esi,[esp+16+32]
-
- dec ebp
- jne threshold@rowloop
-
- pop eax ;remove thresholding temp
-
- pop eax
- pop ebx
- pop ecx
- pop edx
- pop esi
- pop edi
- pop ebp
- ret
-
- end
-