mem_transfer.cpp

来自「gaca源码」· C++ 代码 · 共 282 行

/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - 8bit<->16bit transfer  -
 *
 *  Copyright(C) 2001-2003 Peter Ross <[e-mail]>
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * $Id: mem_transfer.cpp,v 1.1.1.1 2005/07/13 14:36:16 jeanlf Exp $
 *
 ****************************************************************************/

#include "global.h"
#include "mem_transfer.h"

/*****************************************************************************
 *
 * All these functions are used to transfer data from a 8 bit data array
 * to a 16 bit data array.
 *
 * This is typically used during motion compensation, that's why some
 * functions also do the addition/substraction of another buffer during the
 * so called  transfer.
 *
 ****************************************************************************/

//----------------------------
/*
 * SRC - the source buffer
 * DST - the destination buffer
 *
 * Then the function does the 8->16 bit transfer and this serie of operations :
 *
 *    SRC (16bit) = SRC
 *    DST (8bit)  = max(min(SRC, 255), 0)
 */
void transfer_16to8copy(byte *dst, const int *src, dword stride){

   for(int j = 0; j < 8; j++){
      for(int i = 0; i < 8; i++){
         int pixel = *src++;

         if(pixel < 0)
            pixel = 0;
         //else
         if(pixel > 255)
            pixel = 255;
         dst[i] = byte(pixel);
      }
      dst += stride;
   }
}

//----------------------------
/*
 * SRC - the source buffer
 * DST - the destination buffer
 *
 * Then the function does the 16->8 bit transfer and this serie of operations :
 *
 *    SRC (16bit) = SRC
 *    DST (8bit)  = max(min(DST+SRC, 255), 0)
 */
void transfer_16to8add(byte *dst, const int *src, dword stride){

   for(int j = 0; j < 8; j++){
      for(int i = 0; i < 8; i++){
         int pixel = dst[i] + *src++;

         if(pixel < 0)
            pixel = 0;
         //else
         if(pixel > 255)
            pixel = 255;
         dst[i] = byte(pixel);
      }
      //src += 8;
      dst += stride;
   }
}

#ifndef _ARM_
//----------------------------
/*
 * SRC - the source buffer
 * DST - the destination buffer
 *
 * Then the function does the 8->8 bit transfer and this serie of operations :
 *
 *    SRC (8bit) = SRC
 *    DST (8bit) = SRC
 */
void transfer8x8_copy(byte *dst, const byte *src, dword stride){

   assert(!(stride&3));
   assert(!(dword(dst)&3));
#if defined USE_ARM_ASM && 1
   int y, tmp, tmp1;

#define NL "add %0, %0, %4\n   add %1, %1, %4\n\t"
   asm volatile(
      "orr %2, %1, %4\n\t"
      "tst %2, #3\n   bne .tc_no_dw\n\t"
                              //dword version
   "\n.tc_dw_loop:\n\t"
#define COPY_QW "ldmia %1, { %2, %3 }\n   stmia %0, { %2, %3 }\n\t"
      COPY_QW NL COPY_QW NL COPY_QW NL COPY_QW NL COPY_QW NL COPY_QW NL COPY_QW NL COPY_QW
      "b .tc_end\n\t"

   "\n.tc_no_dw:\n\t"
      "tst %2, #1\n   bne .tc_no_w\n\t"
                              //word version
   "\n.tc_w_loop:\n\t"
#define COPY_W \
      "ldrh %2, [%1, #0]\n   strh %2, [%0, #0]\n\t" \
      "ldrh %2, [%1, #2]\n   strh %2, [%0, #2]\n\t" \
      "ldrh %2, [%1, #4]\n   strh %2, [%0, #4]\n\t" \
      "ldrh %2, [%1, #6]\n   strh %2, [%0, #6]\n\t"
      COPY_W NL COPY_W NL COPY_W NL COPY_W NL COPY_W NL COPY_W NL COPY_W NL COPY_W
      "b .tc_end\n\t"

   "\n.tc_no_w:\n\t"
      "mov %5, #8\n\t"
   "\n.tc_b_loop:\n\t"
      "ldrb %2, [%1, #0]\n   strb %2, [%0, #0]\n\t"
      "ldrb %2, [%1, #1]\n   strb %2, [%0, #1]\n\t"
      "ldrb %2, [%1, #2]\n   strb %2, [%0, #2]\n\t"
      "ldrb %2, [%1, #3]\n   strb %2, [%0, #3]\n\t"
      "ldrb %2, [%1, #4]\n   strb %2, [%0, #4]\n\t"
      "ldrb %2, [%1, #5]\n   strb %2, [%0, #5]\n\t"
      "ldrb %2, [%1, #6]\n   strb %2, [%0, #6]\n\t"
      "ldrb %2, [%1, #7]\n   strb %2, [%0, #7]\n\t"
      NL
      "subs %5, %5, #1\n   bne .tc_b_loop\n\t"
      "\n.tc_end:\n\t"
      : "+r"(dst), "+r"(src), "&=r"(tmp), "&=r"(tmp1)
      : "r"(stride), "r"(y)
      );
#else
   if(!(dword(src)&3) && !(dword(dst)&3)){
      for(dword y = 8; y--; ){
         ((dword*)dst)[0] = ((dword*)src)[0];
         ((dword*)dst)[1] = ((dword*)src)[1];

         src += stride;
         dst += stride;
      }
   }else
   if(!(dword(src)&1) && !(dword(dst)&1)){
      for(dword y = 8; y--; ){
         ((word*)dst)[0] = ((word*)src)[0];
         ((word*)dst)[1] = ((word*)src)[1];
         ((word*)dst)[2] = ((word*)src)[2];
         ((word*)dst)[3] = ((word*)src)[3];

         src += stride;
         dst += stride;
      }
   }else{
      for(dword y = 8; y--; ){
         dst[0] = src[0];
         dst[1] = src[1];
         dst[2] = src[2];
         dst[3] = src[3];
         dst[4] = src[4];
         dst[5] = src[5];
         dst[6] = src[6];
         dst[7] = src[7];

         src += stride;
         dst += stride;
      }
   }
#endif
}
#endif

//----------------------------
#ifndef PROFILE

#ifdef __SYMBIAN32__

#include <e32base.h>

void MemSet(void *dst, byte c, dword len){
   Mem::Fill(dst, len, c);
}

//----------------------------

void MemCpy(void *dst, const void *src, dword len){
   Mem::Copy(dst, src, len);
}

//----------------------------

int MemCmp(const void *mem1, const void *mem2, dword len){
   return Mem::Compare((byte*)mem1, len, (byte*)mem2, len);
}

//----------------------------

dword StrLen(const char *cp){ return User::StringLength((const byte*)cp); }

//----------------------------

void Fatal(const char *msg, dword code){

   int len = StrLen(msg);
   TBuf16<20> desc; desc.Copy(TPtr8((byte*)msg, Min(len, 20), len));
   User::Panic(desc, code);
}


#else

//----------------------------
#include <memory.h>
#include <stdio.h>

void MemSet(void *dst, byte c, dword len){
   memset(dst, c, len);
}

//----------------------------

void MemCpy(void *dst, const void *src, dword len){
   memcpy(dst, src, len);
}

//----------------------------

int MemCmp(const void *mem1, const void *mem2, dword len){
   return memcmp(mem1, mem2, len);
}

//----------------------------

void *operator new(size_t sz, TLeave){
   void *vp = new byte[sz];
   if(!vp){
                              //todo: fatal error
      Fatal("Not enough memory", sz);
   }
   return vp;
}

//----------------------------
#include <windows.h>

void Fatal(const char *msg, dword code){

#ifdef _WIN32_WCE
   wchar_t buf[256];
   swprintf(buf, L"%i (%i)", msg, code);
   MessageBox(NULL, buf, L"Fatal error", MB_OK | MB_ICONERROR);
#else
   char buf[256];
   sprintf(buf, "%i (%i)", msg, code);
   MessageBox(NULL, buf, "Fatal error", MB_OK | MB_ICONERROR);
#endif
   exit(1);
}

//----------------------------
#endif
#endif
//----------------------------