postprocessing_sse2.asm

这是一个压缩解压包,用C语言进行编程的,里面有详细的源代码.

;/*****************************************************************************
; *
; *  XVID MPEG-4 VIDEO CODEC
; *  - sse2 post processing -
; *
; *  Copyright(C) 2004 Peter Ross <[e-mail]>
; *               2004 Dcoder <[e-mail]>
; *
; *  XviD 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
; *
; *************************************************************************/

BITS 32

%macro cglobal 1
	%ifdef PREFIX
		%ifdef MARK_FUNCS
			global _%1:function %1.endfunc-%1
			%define %1 _%1:function %1.endfunc-%1
		%else
			global _%1
			%define %1 _%1
		%endif
	%else
		%ifdef MARK_FUNCS
			global %1:function %1.endfunc-%1
		%else
			global %1
		%endif
	%endif
%endmacro

;===========================================================================
; read only data
;===========================================================================

%ifdef FORMAT_COFF
SECTION .rodata
%else
SECTION .rodata align=16
%endif

xmm_0x80:
	times 16 db 0x80

;=============================================================================
; Code
;=============================================================================

SECTION .text

cglobal image_brightness_sse2

;//////////////////////////////////////////////////////////////////////
;// image_brightness_sse2
;//////////////////////////////////////////////////////////////////////

%macro CREATE_OFFSET_VECTOR 2
  mov [%1 +  0], %2
  mov [%1 +  1], %2
  mov [%1 +  2], %2
  mov [%1 +  3], %2
  mov [%1 +  4], %2
  mov [%1 +  5], %2
  mov [%1 +  6], %2
  mov [%1 +  7], %2
  mov [%1 +  8], %2
  mov [%1 +  9], %2
  mov [%1 + 10], %2
  mov [%1 + 11], %2
  mov [%1 + 12], %2
  mov [%1 + 13], %2
  mov [%1 + 14], %2
  mov [%1 + 15], %2
%endmacro

ALIGN 16
image_brightness_sse2:

  push esi
  push edi    ; 8 bytes offset for push
  sub esp, 32 ; 32 bytes for local data (16bytes will be used, 16bytes more to align correctly mod 16)

  movdqa xmm6, [xmm_0x80]

  ; Create a offset...offset vector
  mov eax, [esp+8+32+20] ; brightness offset value	
  mov edx, esp           ; edx will be esp aligned mod 16
  add edx, 15            ; edx = esp + 15
  and edx, ~15           ; edx = (esp + 15)&(~15)
  CREATE_OFFSET_VECTOR edx, al
  movdqa xmm7, [edx]

  mov edx, [esp+8+32+4]  ; Dst
  mov ecx, [esp+8+32+8]  ; stride
  mov esi, [esp+8+32+12] ; width
  mov edi, [esp+8+32+16] ; height

.yloop
  xor eax, eax

.xloop
  movdqa xmm0, [edx + eax]
  movdqa xmm1, [edx + eax + 16] ; xmm0 = [dst]

  paddb xmm0, xmm6              ; unsigned -> signed domain
  paddb xmm1, xmm6
  paddsb xmm0, xmm7
  paddsb xmm1, xmm7             ; xmm0 += offset
  psubb xmm0, xmm6
  psubb xmm1, xmm6              ; signed -> unsigned domain

  movdqa [edx + eax], xmm0
  movdqa [edx + eax + 16], xmm1 ; [dst] = xmm0

  add eax,32
  cmp eax,esi	
  jl .xloop

  add edx, ecx                  ; dst += stride
  sub edi, 1
  jg .yloop

  add esp, 32
  pop edi
  pop esi

  ret
.endfunc
;//////////////////////////////////////////////////////////////////////