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xShandow ·¢±íÓÚ 2004-12-2 15:41

BMPÎÄ¼þ½á¹¹µÄÌ½Ë÷
<a href="mailtwhatif@51.net" target="_blank" >WhatIf</A> 2004-9-10
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µÚÒ»¿éÊÇbmpµÄÎÄ¼þÍ·ÓÃÓÚÃèÊöÕû¸öbmpÎÄ¼þµÄÇé¿ö¡£½á¹¹ÈçÏÂ£º<PRE>typedef struct tagBITMAPFILEHEADER { </PRE><PRE> WORD bfType; </PRE><PRE> DWORD bfSize; </PRE><PRE> WORD bfReserved1; </PRE><PRE> WORD bfReserved2; </PRE><PRE> DWORD bfOffBits; </PRE>
} BITMAPFILEHEADER, *PBITMAPFILEHEADER;
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µÚ¶þ¿éÊÇÎ»Í¼ÐÅÏ¢Í·£¬¼´BITMAPINFOHEADER£¬ÓÃÓÚÃèÊöÕû¸öÎ»Í¼ÎÄ¼þµÄÇé¿ö¡£ÒÔÏÂÌôÖØÒªµÄÊý¾Ý½øÐÐ½âÊÍ
typedef struct tagBITMAPINFOHEADER{
 DWORD biSize; //±íÊ¾±¾½á¹¹µÄ´óÐ¡
 LONG biWidth; //Î»Í¼µÄ¿í¶È
 LONG biHeight; //Î»Í¼µÄ¸ß¶È
WORD biPlanes; //ÓÀÔ¶Îª1 ,ÓÉÓÚÃ»ÓÐÓÃ¹ýËùÒÔ Ã»×öÑÐ¾¿ ¸½msdn½âÊÍ
//Specifies the number of planes for the target device. This value must be set to 1. 
 WORD biBitCount;//Î»Í¼µÄÎ»Êý ·ÖÎª1 4 8 16 24 32 ±¾ÎÄÃ»¶Ô1 4 ½øÐÐÑÐ¾¿
 DWORD biCompression; //±¾ÒÔÎªÑ¹ËõÀàÐÍ£¬µ«ÊÇÈ´ÁíÍâÓÐ×÷ÓÃ£¬ÉÔºò½âÊÍ
 DWORD biSizeImage; //±íÊ¾Î»Í¼Êý¾ÝÇøÓòµÄ´óÐ¡ÒÔ×Ö½ÚÎªµ¥Î»
 LONG biXPelsPerMeter; 
 LONG biYPelsPerMeter; 
 DWORD biClrUsed; 
 DWORD biClrImportant; 
} BITMAPINFOHEADER, *PBITMAPINFOHEADER;
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int pitch;
 if(width%4==0){
 pitch=width;
 }else{
 pitch=width+4-width%4;
 }
 index=buffer; ÒòÎª8Î»Î»Í¼µÄÊý¾ÝÇøÓò´æ·ÅµÄÊÇµ÷É«°åË÷ÒýÖµ£¬ËùÒÔÖ»Ðè¶ÁÈ¡Õâ¸öindex
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 int pitch=width+width%2;
 buffer[(y*pitch+x)*2] 
buffer[(i*pitch+j)*2£«1]
Á½¸öUCHARÄÚ£¬´æ·ÅµÄÊÇ(x,y)´¦µÄÑÕÉ«ÐÅÏ¢
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 int pitch=width%4;
 buffer[(y*width+x)*3+y*pitch];
 buffer[(y*width+x)*3+y*pitch+1];
buffer[(y*width+x)*3+y*pitch+2];
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UCHAR r=quad.rgbRed;
 UCHAR g=quad.rgbGreen;
 UCHAR b=quad.rgbBlue;
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UCHAR b=buffer[(i*pitch+j)*2]&0x1F;
UCHAR g=(((buffer[(i*pitch+j)*2+1]<<6)&0xFF)>>3)+(buffer[(i*pitch+j)*2]>>5);
UCHAR r=(buffer[(i*pitch+j)*2+1]<<1)>>3;
 
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UCHAR b=buffer[(i*pitch+j)*2]&0x1F;
UCHAR g=(((buffer[(i*pitch+j)*2+1]<<5)&0xFF)>>2)+(buffer[(i*pitch+j)*2]>>5);
UCHAR r=buffer[(i*pitch+j)*2+1]>>3;
 
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UCHAR b=buffer[(i*width+j)*3+realPitch];
UCHAR g=buffer[(i*width+j)*3+1+realPitch];
UCHAR r=buffer[(i*width+j)*3+2+realPitch];
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UCHAR b=buffer[(i*width+j)*4];
 UCHAR g=buffer[(i*width+j)*4+1];
 UCHAR r=buffer[(i*width+j)*4+2];
 
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void CBmpTestView::OnDraw(CDC* pDC)
{
 CBmpTestDoc* pDoc = GetDocument();
 ASSERT_VALID(pDoc);
 
 // TOD ÔÚ´Ë´¦Îª±¾»úÊý¾ÝÌí¼Ó»æÖÆ´úÂë
 
 if(filename==""){
 return;
 }
 FILE *fp=fopen(filename,"r");
 if(fp==NULL){
 pDC->TextOut(100,200,"no file found");
 return;
 }
 BITMAPFILEHEADER fileheader;
 BITMAPINFO info;
 
 fread(&fileheader,sizeof(fileheader),1,fp);
 if(fileheader.bfType!=0x4D42){
 pDC->TextOut(100,200,"ÎÞÎ»Í¼ÎÄ¼þÇëÑ¡ÔñÎ»Í¼ÎÄ¼þ");
 fclose(fp);
 return ;
 }
 fread(&info.bmiHeader,sizeof(BITMAPINFOHEADER),1,fp);
 long width=info.bmiHeader.biWidth;
 long height=info.bmiHeader.biHeight;
 UCHAR *buffer=new UCHAR;
 fseek(fp,fileheader.bfOffBits,0);
 fread(buffer,info.bmiHeader.biSizeImage,1,fp);
 
 if(info.bmiHeader.biBitCount==8){
 int pitch;
 if(width%4==0){
 pitch=width;
 }else{
 pitch=width+4-width%4;
 }
 RGBQUAD quad;
 fseek(fp,fileheader.bfOffBits-sizeof(RGBQUAD)*256,0);
 fread(quad,sizeof(RGBQUAD)*256,1,fp);
 if(height>0){
 //height>0 ±íÊ¾Í¼Æ¬µßµ¹
 for(int i=0;i<height;i++){
 for(int j=0;j<width;j++){
 int index=buffer;
 UCHAR r=quad.rgbRed;
 UCHAR g=quad.rgbGreen;
 UCHAR b=quad.rgbBlue;
 pDC->SetPixel(j,height-i,RGB(r,g,b));
 }
 }
 }else{
 for(int i=0;i<0-height;i++){
 for(int j=0;j<width;j++){
 int index=buffer;
 UCHAR r=quad.rgbRed;
 UCHAR g=quad.rgbGreen;
 UCHAR b=quad.rgbBlue;
 pDC->SetPixel(j,i,RGB(r,g,b));
 }
 }
 }
 }else if(info.bmiHeader.biBitCount==16){
 int pitch=width+width%2;
 if(height>0){
 //height>0 ±íÊ¾Í¼Æ¬µßµ¹
 if(info.bmiHeader.biCompression==BI_RGB){
 //¸ÃÄ£Ê½Ö»ÓÐ555
 for(int i=0;i<height;i++){
 for(int j=0;j<width;j++){ 
 //5 5 5 ¸ñÊ½
 UCHAR b=buffer[(i*pitch+j)*2]&0x1F;
 UCHAR g=(((buffer[(i*pitch+j)*2+1]<<6)&0xFF)>>3)+(buffer[(i*pitch+j)*2]>>5);
 UCHAR r=(buffer[(i*pitch+j)*2+1]<<1)>>3;
 pDC->SetPixel(j,height-i,RGB((r*0xFF)/0x1F,(g*0xFF)/0x1F,(b*0xFF)/0x1F));
 }
 }
 }else if(info.bmiHeader.biCompression==BI_BITFIELDS){
 //¸ÃÄ£Ê½ÔÚbitmapinfoheaderÖ®ºó´æÔÚRGBÑÚÂë Ã¿¸öÑÚÂë1 DWORD
 fseek(fp,fileheader.bfOffBits-sizeof(DWORD )*3,0);
 DWORD rMask;
 fread(&rMask,sizeof(DWORD ),1,fp);
 if(rMask==0x7C00){
 // 5 5 5 ¸ñÊ½
 MessageBeep(0);
 for(int i=0;i<height;i++){
 for(int j=0;j<width;j++){
 UCHAR b=buffer[(i*pitch+j)*2]&0x1F;
 UCHAR g=(((buffer[(i*pitch+j)*2+1]<<6)&0xFF)>>3)+(buffer[(i*pitch+j)*2]>>5);
 UCHAR r=(buffer[(i*pitch+j)*2+1]<<1)>>3;
 pDC->SetPixel(j,height-i,RGB((r*0xFF)/0x1F,(g*0xFF)/0x1F,(b*0xFF)/0x1F));
 }
 }
 }else if(rMask==0xF800){
 //5 6 5 ¸ñÊ½
 for(int i=0;i<height;i++){
 for(int j=0;j<width;j++){
 UCHAR b=buffer[(i*pitch+j)*2]&0x1F;
 UCHAR g=(((buffer[(i*pitch+j)*2+1]<<5)&0xFF)>>2)+(buffer[(i*pitch+j)*2]>>5);
 UCHAR r=buffer[(i*pitch+j)*2+1]>>3;
 pDC->SetPixel(j,height-i,RGB(r*0xFF/0x1F,g*0xFF/0x3F,b*0xFF/0x1F));
 }
 }
 }
 }
 }else{
 if(info.bmiHeader.biCompression==BI_RGB){
 //¸ÃÄ£Ê½Ö»ÓÐ555
 for(int i=0;i<0-height;i++){
 for(int j=0;j<width;j++){ 
 //5 5 5 ¸ñÊ½
 UCHAR b=buffer[(i*pitch+j)*2]&0x1F;
 UCHAR g=(((buffer[(i*pitch+j)*2+1]<<6)&0xFF)>>3)+(buffer[(i*pitch+j)*2]>>5);
 UCHAR r=(buffer[(i*pitch+j)*2+1]<<1)>>3;
 pDC->SetPixel(j,i,RGB((r*0xFF)/0x1F,(g*0xFF)/0x1F,(b*0xFF)/0x1F));
 }
 }
 }else if(info.bmiHeader.biCompression==BI_BITFIELDS){
 //¸ÃÄ£Ê½ÔÚbitmapinfoheaderÖ®ºó´æÔÚRGBÑÚÂë Ã¿¸öÑÚÂë1 DWORD
 fseek(fp,fileheader.bfOffBits-sizeof(DWORD )*3,0);
 DWORD rMask;
 fread(&rMask,sizeof(DWORD ),1,fp);
 if(rMask==0x7C00){
 // 5 5 5 ¸ñÊ½
 MessageBeep(0);
 for(int i=0;i<0-height;i++){
 for(int j=0;j<width;j++){
 UCHAR b=buffer[(i*pitch+j)*2]&0x1F;
 UCHAR g=(((buffer[(i*pitch+j)*2+1]<<6)&0xFF)>>3)+(buffer[(i*pitch+j)*2]>>5);
 UCHAR r=(buffer[(i*pitch+j)*2+1]<<1)>>3;
 pDC->SetPixel(j,i,RGB((r*0xFF)/0x1F,(g*0xFF)/0x1F,(b*0xFF)/0x1F));
 }
 }
 }else if(rMask==0xF800){
 //5 6 5 ¸ñÊ½
 for(int i=0;i<0-height;i++){
 for(int j=0;j<width;j++){
 UCHAR b=buffer[(i*pitch+j)*2]&0x1F;
 UCHAR g=(((buffer[(i*pitch+j)*2+1]<<5)&0xFF)>>2)+(buffer[(i*pitch+j)*2]>>5);
 UCHAR r=buffer[(i*pitch+j)*2+1]>>3;
 pDC->SetPixel(j,i,RGB(r*0xFF/0x1F,g*0xFF/0x3F,b*0xFF/0x1F));
 }
 }
 }
 }
 }
 //pDC->TextOut(100,200,"16Î»Í¼");
 }else if(info.bmiHeader.biBitCount==24){
 int pitch=width%4;
 //b g r
 if(height>0){
 //height>0 ±íÊ¾Í¼Æ¬µßµ¹
 for(int i=0;i<height;i++){
 int realPitch=i*pitch;
 for(int j=0;j<width;j++){ 
 UCHAR b=buffer[(i*width+j)*3+realPitch];
 UCHAR g=buffer[(i*width+j)*3+1+realPitch];
 UCHAR r=buffer[(i*width+j)*3+2+realPitch];
 pDC->SetPixel(j,height-i,RGB(r,g,b));
 }
 }
 }else{
 for(int i=0;i<0-height;i++){
 int realPitch=i*pitch;
 for(int j=0;j<width;j++){
 UCHAR b=buffer[(i*width+j)*3+realPitch];
 UCHAR g=buffer[(i*width+j)*3+1+realPitch];
 UCHAR r=buffer[(i*width+j)*3+2+realPitch];
 pDC->SetPixel(j,i,RGB(r,g,b));
 }
 }
 }
 
 //pDC->TextOut(100,200,"24Î»Í¼");
 
 }else if(info.bmiHeader.biBitCount==32){
 // b g r a
 if(height>0){
 //height>0 ±íÊ¾Í¼Æ¬µßµ¹
 for(int i=0;i<0-height;i++){
 for(int j=0;j<width;j++){
 UCHAR b=buffer[(i*width+j)*4];
 UCHAR g=buffer[(i*width+j)*4+1];
 UCHAR r=buffer[(i*width+j)*4+2];
 pDC->SetPixel(j,height-i,RGB(r,g,b));
 }
 }
 }else{
 for(int i=0;i<height;i++){
 for(int j=0;j<width;j++){
 UCHAR b=buffer[(i*width+j)*4];
 UCHAR g=buffer[(i*width+j)*4+1];
 UCHAR r=buffer[(i*width+j)*4+2];
 pDC->SetPixel(j,i,RGB(r,g,b));
 }
 }
 }
 //pDC->TextOut(100,200,"32Î»Í¼");
 }
 delete buffer;
 fclose(fp); 
}

cdn ·¢±íÓÚ 2004-12-6 05:03

ºÃ£¡£¡£¡

fup ·¢±íÓÚ 2004-12-20 14:46

Thank you.

Ò³: [1]

ÊýÑ§½¨Ä£ÉçÇø-ÊýÑ§ÖÐ¹ú's Archiver

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