DDB To DIB

作者: admin 分类: 取词发布时间: 2014-01-21 16:05 ė3,606 浏览数 6没有评论

HANDLE CGraphView::DDBToDIB( CBitmap& bitmap, DWORD dwCompression ) 
 {
     BITMAP                bm;
     BITMAPINFOHEADER    bi;
     LPBITMAPINFOHEADER  lpbi;
     DWORD                dwLen;
     HANDLE                hDIB;
     HANDLE                handle;
     HDC                    hDC;
     HPALETTE            hPal;

     CWindowDC            dc( this );
     CPalette            pal;
     //如果支持调色板的话，则建立它
    if( dc.GetDeviceCaps( RASTERCAPS ) & RC_PALETTE )
     {
         UINT        nSize   = sizeof(LOGPALETTE) + ( sizeof(PALETTEENTRY) * 256 );
         LOGPALETTE* pLP     = (LOGPALETTE*)new BYTE[nSize];
         pLP->palVersion     = 0x300;
         pLP->palNumEntries = (unsigned short)GetSystemPaletteEntries( dc, 0, 255, 
         pLP->palPalEntry );

         pal.CreatePalette( pLP );

         //释放
        delete[] pLP;
     }

     ASSERT( bitmap.GetSafeHandle() );

     //不支持BI_BITFIELDS类型
    if( dwCompression == BI_BITFIELDS )
         return NULL;

     //如果调色板为空，则用默认调色板
    hPal = (HPALETTE) pal.GetSafeHandle();
     if (hPal==NULL)
         hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);

     //获取位图信息
    bitmap.GetObject(sizeof(bm),(LPSTR)&bm);

     //初始化位图信息头
    bi.biSize        = sizeof(BITMAPINFOHEADER);
     bi.biWidth        = bm.bmWidth;
     bi.biHeight         = bm.bmHeight;
     bi.biPlanes         = 1;
     bi.biBitCount        = (unsigned short)(bm.bmPlanes * bm.bmBitsPixel) ;
     bi.biCompression    = dwCompression;
     bi.biSizeImage        = 0;
     bi.biXPelsPerMeter    = 0;
     bi.biYPelsPerMeter    = 0;
     bi.biClrUsed        = 0;
     bi.biClrImportant    = 0;

     //计算信息头及颜色表大小
    int nColors = 0;
     if(bi.biBitCount <= 8)
         {
         nColors = (1 << bi.biBitCount);
         }
     dwLen  = bi.biSize + nColors * sizeof(RGBQUAD);

     hDC = ::GetDC(NULL);
     hPal = SelectPalette(hDC,hPal,FALSE);
     RealizePalette(hDC);

     //为信息头及颜色表分配内存
    hDIB = GlobalAlloc(GMEM_FIXED,dwLen);

     if (!hDIB){
         SelectPalette(hDC,hPal,FALSE);
         ::ReleaseDC(NULL,hDC);
         return NULL;
     }

     lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);

     *lpbi = bi;

     //调用 GetDIBits 计算图像大小
    GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,
             (LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS);

     bi = *lpbi;

     //图像的每一行都对齐(32bit)边界
    if (bi.biSizeImage == 0){
         bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8) 
                         * bi.biHeight;

         if (dwCompression != BI_RGB)
             bi.biSizeImage = (bi.biSizeImage * 3) / 2;
     }

     //重新分配内存大小，以便放下所有数据
    dwLen += bi.biSizeImage;
     handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE) ;
     if (handle != NULL)
         hDIB = handle;
     else
         {
         GlobalFree(hDIB);

         //重选原始调色板
        SelectPalette(hDC,hPal,FALSE);
         ::ReleaseDC(NULL,hDC);
         return NULL;
         }

     //获取位图数据
    lpbi = (LPBITMAPINFOHEADER)hDIB;

     //最终获得的DIB
     BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),
                 0L,                      //扫描行起始处
                (DWORD)bi.biHeight,      //扫描行数
                (LPBYTE)lpbi             //位图数据地址
                + (bi.biSize + nColors * sizeof(RGBQUAD)),
                 (LPBITMAPINFO)lpbi,      //位图信息地址
                (DWORD)DIB_RGB_COLORS);  //颜色板使用RGB

     if( !bGotBits )
     {
         GlobalFree(hDIB);

         SelectPalette(hDC,hPal,FALSE);
         ::ReleaseDC(NULL,hDC);
         return NULL;
     }

     SelectPalette(hDC,hPal,FALSE);
     ::ReleaseDC(NULL,hDC);
     return hDIB;
 }

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HANDLE CGraphView::DDBToDIB( CBitmap& bitmap, DWORD dwCompression )

{

BITMAP bm;

BITMAPINFOHEADER bi;

LPBITMAPINFOHEADER lpbi;

DWORD dwLen;

HANDLE hDIB;

HANDLE handle;

HDC hDC;

HPALETTE hPal;

CWindowDC dc( this );

CPalette pal;

//如果支持调色板的话，则建立它

if( dc.GetDeviceCaps( RASTERCAPS ) & RC_PALETTE )

{

UINT nSize = sizeof(LOGPALETTE) + ( sizeof(PALETTEENTRY) * 256 );

LOGPALETTE* pLP = (LOGPALETTE*)new BYTE[nSize];

pLP->palVersion = 0x300;

pLP->palNumEntries = (unsigned short)GetSystemPaletteEntries( dc, 0, 255,

pLP->palPalEntry );

pal.CreatePalette( pLP );

//释放

delete[] pLP;

}

ASSERT( bitmap.GetSafeHandle() );

//不支持BI_BITFIELDS类型

if( dwCompression == BI_BITFIELDS )

return NULL;

//如果调色板为空，则用默认调色板

hPal = (HPALETTE) pal.GetSafeHandle();

if (hPal==NULL)

hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);

//获取位图信息

bitmap.GetObject(sizeof(bm),(LPSTR)&bm);

//初始化位图信息头

bi.biSize = sizeof(BITMAPINFOHEADER);

bi.biWidth = bm.bmWidth;

bi.biHeight = bm.bmHeight;

bi.biPlanes = 1;

bi.biBitCount = (unsigned short)(bm.bmPlanes * bm.bmBitsPixel) ;

bi.biCompression = dwCompression;

bi.biSizeImage = 0;

bi.biXPelsPerMeter = 0;

bi.biYPelsPerMeter = 0;

bi.biClrUsed = 0;

bi.biClrImportant = 0;

//计算信息头及颜色表大小

int nColors = 0;

if(bi.biBitCount <= 8)

{

nColors = (1 << bi.biBitCount);

}

dwLen = bi.biSize + nColors * sizeof(RGBQUAD);

hDC = ::GetDC(NULL);

hPal = SelectPalette(hDC,hPal,FALSE);

RealizePalette(hDC);

//为信息头及颜色表分配内存

hDIB = GlobalAlloc(GMEM_FIXED,dwLen);

if (!hDIB){

SelectPalette(hDC,hPal,FALSE);

::ReleaseDC(NULL,hDC);

return NULL;

}

lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);

*lpbi = bi;

//调用 GetDIBits 计算图像大小

GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,

(LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS);

bi = *lpbi;

//图像的每一行都对齐(32bit)边界

if (bi.biSizeImage == 0){

bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8)

* bi.biHeight;

if (dwCompression != BI_RGB)

bi.biSizeImage = (bi.biSizeImage * 3) / 2;

}

//重新分配内存大小，以便放下所有数据

dwLen += bi.biSizeImage;

handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE) ;

if (handle != NULL)

hDIB = handle;

else

{

GlobalFree(hDIB);

//重选原始调色板

SelectPalette(hDC,hPal,FALSE);

::ReleaseDC(NULL,hDC);

return NULL;

}

//获取位图数据

lpbi = (LPBITMAPINFOHEADER)hDIB;

//最终获得的DIB

BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),

0L, //扫描行起始处

(DWORD)bi.biHeight, //扫描行数

(LPBYTE)lpbi //位图数据地址

+ (bi.biSize + nColors * sizeof(RGBQUAD)),

(LPBITMAPINFO)lpbi, //位图信息地址

(DWORD)DIB_RGB_COLORS); //颜色板使用RGB

if( !bGotBits )

{

GlobalFree(hDIB);

SelectPalette(hDC,hPal,FALSE);

::ReleaseDC(NULL,hDC);

return NULL;

}

SelectPalette(hDC,hPal,FALSE);

::ReleaseDC(NULL,hDC);

return hDIB;

}

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