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BMP图片支持2006-04-27 22:57:00

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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////BMP接口：      基于8位，16位位图的显示及贴图文件处理
/////版本：         3.0
/////程序：     沈华
/////日期：     2004.12.26
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////

#ifndef __ZBMP_CPP
#define __ZBMP_CPP

//文件头14字节结构（不常用）
struct
 {
 int type;  //2
 long filesize;  //4
 int reserved1;  //2
 int reserved2;  //2
 long imageoffset; //4
 }BMPHEAD;  //14bytes

//信息头结构40字节(同ICONINFO)
struct
 {
 long size;     //4
 long width;               //4
 long height;               //4
 int planes;                //2
 int bitcount;              //2
 long compress;             //4
 long imagesize;     //4
 long xpelspermeter;        //4
 long ypelspermeter;        //4
 long clrused;         //4
 long clrimportant;         //4
 }BMPINFO;     //40bytes

//自定义的256色图片格式,主要用于3D引擎纹理贴图
struct
 {
 long width;   //图片宽度
 long height;   //图片高度
 unsigned char colornum[256][3]; //已规格化（直接调色板接口排列顺序）
 }PICINFO;

//图片高宽及色深全局变量
unsigned long BMPWIDTH;
unsigned long BMPHEIGHT;
unsigned long BITDEPTH;

//设置全局量和返回备用调色板号（打开成功返回大于零值）
int G_OPENBMP(unsigned char far * filename,unsigned int tsbnum=0,char lookinfo=0);
int G_SHOWBMP256(unsigned char far * filename,int sx=0,int sy=0,unsigned int tsbnum=0);
int G_SHOWBMP565(unsigned char far * filename,int sx=0,int sy=0);
//显示BMP图片的通用版本
int G_SHOWBMP(unsigned char far * filename,int sx=0,int sy=0,unsigned int tsbnum=0);
//显示PIC格式文件
int G_SHOWPIC(unsigned char far * filename,int sx=0,int sy=0);
//BMP格式转换为PIC格式
int G_BMP2PIC(unsigned char far * bmpname,unsigned char far * picname);

int G_OPENBMP(unsigned char far * filename,unsigned int tsbnum,char lookinfo)
{
unsigned char colornum[256][4];
FILE *fp;
 if( (fp=fopen(filename,"rb"))==NULL)
  {fclose(fp);return 0;}
 if(lookinfo!=-1)
  {fread(&BMPHEAD,1,sizeof(BMPHEAD),fp);}
 //定位信息结构
 fseek(fp,14,SEEK_SET);
 //读取信息结构数据
 fread(&BMPINFO,1,sizeof(BMPINFO),fp);
 if(lookinfo)
 {
 G_CLS(0);
 G_PUTS("位图文件的格式信息",32,0);
 G_PUTS("按任意键退出",200,0);
 G_PRINTEN(0,20,"BMPHEAD:");
 G_PRINTEN(0,35,"   filesize=%ldKb",BMPHEAD.filesize/1000);
 G_PRINTEN(0,50,"  reserved1=%d",BMPHEAD.reserved1);
 G_PRINTEN(0,65,"  reserved2=%d",BMPHEAD.reserved2);
 G_PRINTEN(0,80,"imageoffset=%ld",BMPHEAD.imageoffset);
 G_PRINTEN(160,20,"BMPINFO:");
 G_PRINTEN(160,35,"          size=%ld",BMPINFO.size);
 G_PRINTEN(160,50,"         width=%ld",BMPINFO.width);
 G_PRINTEN(160,65,"        height=%ld",BMPINFO.height);
 G_PRINTEN(160,80,"        planes=%d",BMPINFO.planes);
 G_PRINTEN(160,95,"      bitcount=%d",BMPINFO.bitcount);
 G_PRINTEN(160,110,"      compress=%ld",BMPINFO.compress);
 G_PRINTEN(160,130,"     imagesize=%ldKb",BMPINFO.imagesize/1000);
 G_PRINTEN(160,145," xpelspermeter=%ld",BMPINFO.xpelspermeter);
 G_PRINTEN(160,160," ypelspermeter=%ld",BMPINFO.ypelspermeter);
 G_PRINTEN(160,175,"       clrused=%ld",BMPINFO.clrused);
 G_PRINTEN(160,190,"  clrimportant=%ld",BMPINFO.clrimportant);
 getch();
 G_CLS(0);
 }
 //向全局变量赋值
 BMPWIDTH=BMPINFO.width;
 BMPHEIGHT=BMPINFO.height;
 //确定是否压缩及256色格式
 switch(BMPINFO.bitcount)
 {
 case 4:
  BITDEPTH=4;break;
 case 8:
  BITDEPTH=8;break;
 case 24:
  BITDEPTH=24;break;
 }
 //不支持压缩或16色格式
 if(BMPINFO.compress==1 || BITDEPTH==4)
   {fclose(fp);return 0;}
 //不支持在256色模式下显示真彩格式图片即不支持抖动显示
 if(G_BITWIDTH==1 && BITDEPTH==24)
   {fclose(fp);return 0;}
 //256色格式设置调色板索引
 if(BITDEPTH==8)
 {
  fseek(fp,54,SEEK_SET);
  fread(colornum,1,1024,fp);
  for(unsigned int i=0;i<256;i++)
   {
   G_TSB[tsbnum][i][0]=(colornum[i][2])>>2;
   G_TSB[tsbnum][i][1]=(colornum[i][1])>>2;
   G_TSB[tsbnum][i][2]=(colornum[i][0])>>2;
   }
 }
fclose(fp);
return tsbnum;
}

int G_SHOWBMP256(unsigned char far * filename,int sx,int sy,unsigned int tsbnum)
{
FILE *fp;
 if( (fp=fopen(filename,"rb"))==NULL)
  {fclose(fp);return 3;}
 unsigned char colorn[1024];//显示宽度支持至1024象素
 long width=BMPWIDTH,height=BMPHEIGHT;
 long gy=height,gx=width,zy=0L,offn;
 long xoff=0L,yoff=0L;
 unsigned int bz8,bz565;
  sx+=G_VMINX;
  sy+=G_VMINY;
  //left clip
  if(sx<G_VMINX)   //超出左边界
   {
   xoff=abs(-sx);//扫描线缓存起始地址
   gx=abs(width-xoff);//裁剪后图片宽度
   //如裁剪后图片宽度>屏幕取屏幕尺寸
   if(gx>(G_VMAXX-G_VMINX)){xoff=0;gx=(G_VMAXX-G_VMINX);}
   if(sx<-width){xoff=width;gx=0;}
   //图片显示到屏幕的X坐标
   sx=0;
   }
  //right clip  case
  if(sx>=G_VMAXX-width)
   {
   xoff=0;
   gx=abs(G_VMAXX-sx);
   if(sx>G_VMAXX){xoff=width;gx=0;}
   sx=sx;
   }
  //no clip case
  else
   {
   xoff=0;
   gx=width;
   sx=sx;
   }
  //up clip case
  if(sy<G_VMINY)   //超出上边界
   {
   yoff=abs(-sy);
   gy=abs(height-yoff);//裁剪后图片宽度
   //如裁剪后图片宽度>屏幕取屏幕尺寸
   if(gy>(G_VMAXY-G_VMINY)){gy=(G_VMAXY-G_VMINY);}
   if(sy<-height){yoff=height;gy=0;}
   //图片显示到屏幕的X坐标
   sy=0;
   }
  //down clip case
  if(sy>G_VMAXY-height)
   {
   yoff=0;
   gy=abs(G_VMAXY-sy);
   if(sy>G_VMAXY){yoff=height;gy=0;}
   sy=sy;
   }
  else
   {
   yoff=0;
   gy=height;
   sy=sy;
   }
  sx-=G_VMINX;
  sy-=G_VMINY;

  width=(width+3)/4*4;
  offn=1078L+(height-yoff-1L)*(width);

  for(zy=0;zy<gy;zy++)
   {
   fseek(fp,(offn-zy*width+xoff),SEEK_SET);
   fread(colorn,1,gx,fp);
   switch(G_BITWIDTH)//测试扫描线内是否有换页
   {
   case 1: bz8=G_GETXY_YESC8(G_VMINX,G_VMINX+gx+sx,(unsigned int)zy+sy+G_VMINY);
    if(bz8){G_SETPAGE(G_PAGE[bz8-100]);}
    break;
   case 2: bz565=G_GETXY_YESC565(G_VMINX,G_VMINX+gx+sx,(unsigned int)zy+sy+G_VMINY);
    if(bz565){G_SETPAGE(G_PAGE[bz565-100]);}
    break;
   }
   for(unsigned int x=0;x<gx;x++)
     {
     unsigned char c=colorn[x];
     if(G_BITWIDTH==1)//256色模式显示256色文件
      {
      if(bz8) //无换页版本写点
       {G_PUTPIXEL_NOC(x+sx,zy+sy,c);}
      else //有换页版本写点
       {G_PUTPIXEL(x+sx,zy+sy,c);}
      }
     if(G_BITWIDTH==2)//增强色模式显示256色文件
      {
      unsigned char r=(G_TSB[tsbnum][c][0])>>1;
      unsigned char g=(G_TSB[tsbnum][c][1]);
      unsigned char b=(G_TSB[tsbnum][c][2])>>1;
      if(bz565)
       {G_PUTPIXEL_NOC(x+sx,zy+sy,RGB565(r,g,b));}
      else
       {G_PUTPIXEL(x+sx,zy+sy,RGB565(r,g,b));}
      }

     }
   }
fclose(fp);
return 0;
}

int G_SHOWBMP565(unsigned char far * filename,int sx,int sy)
{
if(G_BITWIDTH==1)return 0;
FILE *fp;
 if( (fp=fopen(filename,"rb"))==NULL)
  {fclose(fp);return 3;}
 RGB24 colorn[1024];//显示宽度支持至1024象素
 long width=BMPWIDTH,height=BMPHEIGHT;
 long gx=width;
 long gy=height;
 long zy=0L;
 int xoff=0,yoff=0;
 long offn;
 unsigned char r,g,b;
 unsigned int bz565;
  sx=sx+G_VMINX;
  sy=sy+G_VMINY;
  //left clip
  if(sx<G_VMINX)   //超出左边界
   {
   xoff=abs(-sx);//扫描线缓存起始地址
   gx=abs(width-xoff);//裁剪后图片宽度
   //如裁剪后图片宽度>屏幕取屏幕尺寸
   if(gx>(G_VMAXX-G_VMINX)){xoff=0;gx=(G_VMAXX-G_VMINX);}
   if(sx<-width){xoff=width;gx=0;}
   //图片显示到屏幕的X坐标
   sx=0;
   }
  //right clip  case
  if(sx>=G_VMAXX-width)
   {
   xoff=0;
   gx=abs(G_VMAXX-sx);
   if(sx>G_VMAXX){xoff=width;gx=0;}
   sx=sx;
   }
  //no clip case
  else
   {
   xoff=0;
   gx=width;
   sx=sx;
   }
  //up clip case
  if(sy<G_VMINY)   //超出上边界
   {
   yoff=abs(-sy);
   gy=abs(height-yoff);//裁剪后图片宽度
   //如裁剪后图片宽度>屏幕取屏幕尺寸
   if(gy>(G_VMAXY-G_VMINY)){gy=(G_VMAXY-G_VMINY);}
   if(sy<-height){yoff=height;gy=0;}
   //图片显示到屏幕的X坐标
   sy=0;
   }
  //down clip case
  if(sy>G_VMAXY-height)
   {
   yoff=0;
   gy=abs(G_VMAXY-sy);
   if(sy>G_VMAXY){yoff=height;gy=0;}
   sy=sy;
   }
  else
   {
   yoff=0;
   gy=height;
   sy=sy;
   }
  sx-=G_VMINX;
  sy-=G_VMINY;
  width=((width*3)/4)*4+(width*3)%4+width%4;
  offn=54L+(height-yoff-1)*width;

  for(zy=0;zy<gy;zy++)
   {
   fseek(fp,(offn-zy*width+xoff*G_BITWIDTH),SEEK_SET);
   fread(colorn,1,gx*3L,fp);
   bz565=G_GETXY_YESC565(G_VMINX,G_VMINX+gx+sx,(unsigned int)zy+sy+G_VMINY);
   if(bz565){G_SETPAGE(G_PAGE[bz565-100]);}
   for(unsigned int x=0;x<gx;x++)
     {
      unsigned char b=((colorn[x].red)>>3)&0x1f;
      unsigned char g=((colorn[x].green)>>2)&0x3f;
      unsigned char r=((colorn[x].blue>>3))&0x1f;
     if(bz565)
      {G_PUTPIXEL_NOC(x+sx,zy+sy,RGB565(r,g,b));}
     else
      {G_PUTPIXEL(x+sx,zy+sy,RGB565(r,g,b));}
     }
   }
fclose(fp);
return 0;
}

int G_SHOWPIC(unsigned char far * filename,int sx,int sy)
{
FILE *fp;
 if( (fp=fopen(filename,"rb"))==NULL)
  {fclose(fp);return 3;}
 //读取信息头
 fread((char *)&PICINFO,1,sizeof(PICINFO),fp);
 long width=PICINFO.width,height=PICINFO.height;
 unsigned char colorn[1024];
 unsigned char colornum[256][3];
 long gx=width;
 long gy=height;
 long zy=0L;
 int xoff=0,yoff=0;
 long offn=776L;
 unsigned char r,g,b;
 unsigned int bz8,bz565;

 //读取调色板
  fseek(fp,8,SEEK_SET);
  fread(colornum,1,768,fp);
  GDX=FP_OFF(colornum);GES=FP_SEG(colornum);
  GCX=256;GBX=0;GAX=0x1012;
  int86x(0x10,&regs,&regs,&sregs);
  sx=sx+G_VMINX;
  sy=sy+G_VMINY;
  //left clip
  if(sx<G_VMINX)   //超出左边界
   {
   xoff=abs(-sx);//扫描线缓存起始地址
   gx=abs(width-xoff);//裁剪后图片宽度
   //如裁剪后图片宽度>屏幕取屏幕尺寸
   if(gx>(G_VMAXX-G_VMINX)){xoff=0;gx=(G_VMAXX-G_VMINX);}
   if(sx<-width){xoff=width;gx=0;}
   //图片显示到屏幕的X坐标
   sx=0;
   }
  //right clip  case
  if(sx>=G_VMAXX-width)
   {
   xoff=0;
   gx=abs(G_VMAXX-sx);
   if(sx>G_VMAXX){xoff=width;gx=0;}
   sx=sx;
   }
  //no clip case
  else
   {
   xoff=0;
   gx=width;
   sx=sx;
   }
  //up clip case
  if(sy<G_VMINY)   //超出上边界
   {
   yoff=abs(-sy);
   gy=abs(height-yoff);//裁剪后图片宽度
   //如裁剪后图片宽度>屏幕取屏幕尺寸
   if(gy>(G_VMAXY-G_VMINY)){gy=(G_VMAXY-G_VMINY);}
   if(sy<-height){yoff=height;gy=0;}
   //图片显示到屏幕的X坐标
   sy=0;
   }
  //down clip case
  if(sy>G_VMAXY-height)
   {
   yoff=0;
   gy=abs(G_VMAXY-sy);
   if(sy>G_VMAXY){yoff=height;gy=0;}
   sy=sy;
   }
  else
   {
   yoff=0;
   gy=height;
   sy=sy;
   }
  sx-=G_VMINX;
  sy-=G_VMINY;
  width=(width+3)/4*4;

  for(zy=0;zy<gy;zy++)
   {
   fseek(fp,(offn+(zy+yoff)*width),SEEK_SET);
   fread(colorn,1,gx+xoff,fp);
   switch(G_BITWIDTH)
   {
   case 1: bz8=G_GETXY_YESC8(G_VMINX,G_VMINX+gx+sx,(unsigned int)zy+sy+G_VMINY);
    if(bz8){G_SETPAGE(G_PAGE[bz8-100]);}
    break;
   case 2: bz565=G_GETXY_YESC565(G_VMINX,G_VMINX+gx+sx,(unsigned int)zy+sy+G_VMINY);
    if(bz565){G_SETPAGE(G_PAGE[bz565-100]);}
    break;
   }
   for(unsigned int x=0;x<gx;x++)
     {
     unsigned char c=colorn[x+xoff];
     if(G_BITWIDTH==1)
      {
      if(bz8)
       {G_PUTPIXEL_NOC(x+sx,zy+sy,c);}
      else
       {G_PUTPIXEL(x+sx,zy+sy,c);}
      }
     if(G_BITWIDTH==2)
      {
      r=colornum[c][0]>>1;
      g=colornum[c][1];
      b=colornum[c][2]>>1;
      if(bz565)
       {G_PUTPIXEL_NOC(x+sx,zy+sy,RGB565(r,g,b));}
      else
       {G_PUTPIXEL(x+sx,zy+sy,RGB565(r,g,b));}
      }
    }
  }
fclose(fp);
return 0;
}

int G_SHOWBMP(unsigned char far * filename,int sx,int sy,unsigned int tsbnum)
{
if(G_BITWIDTH==1 && BITDEPTH==24){return 4;}
FILE *fp;
 if( (fp=fopen(filename,"rb"))==NULL)
  {fclose(fp);return 3;}
 long width=BMPWIDTH,height=BMPHEIGHT;
 long gy=height,gx=width,zy=0L,offn;
 long xoff=0L,yoff=0L;
 unsigned int bz8,bz565;
  sx+=G_VMINX;
  sy+=G_VMINY;
  //left clip
  if(sx<G_VMINX)   //超出左边界
   {
   xoff=abs(-sx);//扫描线缓存起始地址
   gx=abs(width-xoff);//裁剪后图片宽度
   //如裁剪后图片宽度>屏幕取屏幕尺寸
   if(gx>(G_VMAXX-G_VMINX)){xoff=0;gx=(G_VMAXX-G_VMINX);}
   if(sx<-width){xoff=width;gx=0;}
   //图片显示到屏幕的X坐标
   sx=0;
   }
  //right clip  case
  if(sx>=G_VMAXX-width)
   {
   xoff=0;
   gx=abs(G_VMAXX-sx);
   if(sx>G_VMAXX){xoff=width;gx=0;}
   sx=sx;
   }
  //no clip case
  else
   {
   xoff=0;
   gx=width;
   sx=sx;
   }
  //up clip case
  if(sy<G_VMINY)   //超出上边界
   {
   yoff=abs(-sy);
   gy=abs(height-yoff);//裁剪后图片宽度
   //如裁剪后图片宽度>屏幕取屏幕尺寸
   if(gy>(G_VMAXY-G_VMINY)){gy=(G_VMAXY-G_VMINY);}
   if(sy<-height){yoff=height;gy=0;}
   //图片显示到屏幕的X坐标
   sy=0;
   }
  //down clip case
  if(sy>G_VMAXY-height)
   {
   yoff=0;
   gy=abs(G_VMAXY-sy);
   if(sy>G_VMAXY){yoff=height;gy=0;}
   sy=sy;
   }
  else
   {
   yoff=0;
   gy=height;
   sy=sy;
   }
  sx-=G_VMINX;
  sy-=G_VMINY;

 switch(BITDEPTH)
 {
 case 4: break;//不支持16色格式
 case 8: unsigned char colorn8[1024];
  width=(width+3)/4*4;
  offn=1078L+(height-yoff-1L)*(width);
  for(zy=0;zy<gy;zy++)
   {
   fseek(fp,(offn-zy*width+xoff),SEEK_SET);
   fread(colorn8,1,gx,fp);
   switch(G_BITWIDTH)
   {
   case 1: bz8=G_GETXY_YESC8(G_VMINX,G_VMINX+gx+sx,(unsigned int)zy+sy+G_VMINY);
    if(bz8){G_SETPAGE(G_PAGE[bz8-100]);}
    break;
   case 2: bz565=G_GETXY_YESC565(G_VMINX,G_VMINX+gx+sx,(unsigned int)zy+sy+G_VMINY);
    if(bz565){G_SETPAGE(G_PAGE[bz565-100]);}
    break;
   }
   for(unsigned int x=0;x<gx;x++)
     {
     unsigned char c=colorn8[x];
     if(G_BITWIDTH==1)
      {
      if(bz8)
       {G_PUTPIXEL_NOC(x+sx,zy+sy,c);}
      else
       {G_PUTPIXEL(x+sx,zy+sy,c);}
      }
     if(G_BITWIDTH==2)
      {
      unsigned char r=(G_TSB[tsbnum][c][0])>>1;
      unsigned char g=(G_TSB[tsbnum][c][1]);
      unsigned char b=(G_TSB[tsbnum][c][2])>>1;
      if(bz565)
       {G_PUTPIXEL_NOC(x+sx,zy+sy,RGB565(r,g,b));}
      else
       {G_PUTPIXEL(x+sx,zy+sy,RGB565(r,g,b));}
      }
     }
   }
  break;
 case 24:
  RGB24 colorn[1024];
  width=((width*3)/4)*4+(width*3)%4+width%4;
  offn=54L+(height-yoff-1)*width;
  for(zy=0;zy<gy;zy++)
   {
   fseek(fp,(offn-zy*width+xoff*G_BITWIDTH),SEEK_SET);
   fread(colorn,1,gx*3L,fp);
   bz565=G_GETXY_YESC565(G_VMINX,G_VMINX+gx+sx,(unsigned int)zy+sy+G_VMINY);
   if(bz565){G_SETPAGE(G_PAGE[bz565-100]);}
   for(unsigned int x=0;x<gx;x++)
     {
      unsigned char b=((colorn[x].red)>>3)&0x1f;
      unsigned char g=((colorn[x].green)>>2)&0x3f;
      unsigned char r=((colorn[x].blue>>3))&0x1f;
     if(bz565)
      {G_PUTPIXEL_NOC(x+sx,zy+sy,RGB565(r,g,b));}
     else
      {G_PUTPIXEL(x+sx,zy+sy,RGB565(r,g,b));}
     }
   }
  break;
 }
fclose(fp);
return 0;
}

int G_BMP2PIC(unsigned char far * bmpname,unsigned char far * picname)
{
//读取BMP格式文件
 FILE * bmpfp;
 if( (bmpfp=fopen(bmpname,"rb"))==NULL)
  {fclose(bmpfp);return 3;}
 //跳过读取文件头
 fseek(bmpfp,14,SEEK_SET);
 //读取信息头
 fread(&BMPINFO,1,sizeof(BMPINFO),bmpfp);
 //确定是否压缩及256色格式
 if (BMPINFO.compress!=0)
  {fclose(bmpfp);return 3;}
 if(BMPINFO.bitcount!=8)
  {fclose(bmpfp);return 3;}

 unsigned char far * databuf=(unsigned char far *)farmalloc(BMPINFO.width);
 if(databuf==NULL)
  {fclose(bmpfp);return 2;}
 //BMP格式第一行数据在文件中的指针
 long offn=1078+(BMPINFO.height-1)*BMPINFO.width;

//创建PIC格式文件
 FILE * picfp;
 if( (picfp=fopen(picname,"wb"))==NULL)
  {farfree(databuf);fclose(bmpfp);fclose(picfp);return 3;}
 long wd[2];
 unsigned char colorpal1[256][4];
 unsigned char colorpal2[256][3];
 //从BMP格式文件读尺寸数据
 wd[0]=(BMPINFO.width+3)/4*4;
 wd[1]=BMPINFO.height;
 //从BMP格式文件读调色板数据
 fseek(bmpfp,54,SEEK_SET);
 fread(colorpal1,1,1024,bmpfp);
  for(unsigned int i=0;i<256;i++)
   {
   colorpal2[i][0]=(colorpal1[i][2])>>2;
   colorpal2[i][1]=(colorpal1[i][1])>>2;
   colorpal2[i][2]=(colorpal1[i][0])>>2;
   }

 //写尺寸数据到PIC文件
 fwrite(wd,4,2,picfp);
 //写调色板数据到PIC文件
 fseek(picfp,8,SEEK_SET);
 fwrite(colorpal2,1,768,picfp);
 //写颜色数据到文件
 for(unsigned int zy=0;zy<BMPINFO.height;zy++)
  {
   unsigned long cap=zy*BMPINFO.width;
   fseek(bmpfp,(offn-cap),SEEK_SET);
   fread(databuf,1,BMPINFO.width,bmpfp);
   fseek(picfp,776+cap,SEEK_SET);
   fwrite(databuf,1,BMPINFO.width,picfp);
  }
farfree(databuf);
fclose(bmpfp);
fclose(picfp);
return 0;
}


#endif

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