VC下读取PSD函数

HRESULT LoadPSD( LPSTR strFilename ) // 读取PSD文件 { DWORD dwWidth, dwHeight; // 宽高 long lSurfWidth = m_Rect.right - m_Rect.left; long lSurfHeight = m_Rect.bottom - m_Rect.top; WORD CompressionType; // 压缩类型 HDC hDC; FILE *fpPSD; WORD ChannelCount; // 通道数 // 打开PSD文件 if ( ( fpPSD = fopen ( strFilename, "rb" ) ) == NULL ) { return E_FAIL; } // 头四个字节为"8BPS" char signature[5]; signature[0] = fgetc( fpPSD ); signature[1] = fgetc( fpPSD ); signature[2] = fgetc( fpPSD ); signature[3] = fgetc( fpPSD ); signature[4] = '/0'; if ( strcmp( signature,"8BPS" ) != 0 ) { return E_FAIL; } // 版本必须为1 if ( Read16( fpPSD ) != 1 ) { return E_FAIL; } // 跳过一些数据 (总是0) Read32( fpPSD ); Read16( fpPSD ); // 读取通道数 ChannelCount = Read16( fpPSD ); // 确定至少有一个通道 if ( ( ChannelCount < 0 ) || ( ChannelCount > MAX_PSD_CHANNELS ) ) { return E_FAIL; } // 读入宽和高 dwHeight = Read32( fpPSD ); dwWidth = Read32( fpPSD ); if ( dwWidth != ( DWORD )lSurfWidth || dwHeight != ( DWORD )lSurfHeight ) { return E_FAIL; } // 只读入8位通道 if ( Read16( fpPSD ) != 8 ) { return E_FAIL; } // 确定模式为RGB. // 可能值： // 0: 位图 // 1: 灰阶 // 2: 索引 // 3: RGB // 4: CMYK // 7: Multichannel // 8: Duotone // 9: Lab if ( Read16( fpPSD ) != 3 ) { return E_FAIL; } // 跳过数据（如调色板） int ModeDataCount = Read32( fpPSD ); if ( ModeDataCount ) fseek( fpPSD, ModeDataCount, SEEK_CUR ); // 跳过数据（如：pen tool paths, etc） int ResourceDataCount = Read32( fpPSD ); if ( ResourceDataCount ) fseek( fpPSD, ResourceDataCount, SEEK_CUR ); // 条过保留数据 int ReservedDataCount = Read32( fpPSD ); if ( ReservedDataCount ) fseek( fpPSD, ReservedDataCount, SEEK_CUR ); // 0: 非压缩 // 1: RLE压缩 CompressionType = Read16( fpPSD ); if ( CompressionType > 1 ) { return E_FAIL; } BYTE* PSDPixels = new BYTE[ ( lSurfWidth * lSurfHeight ) * 4 ]; // 解包数据 UnPackPSD( fpPSD, lSurfWidth, lSurfHeight, PSDPixels, ChannelCount, CompressionType ); fclose( fpPSD ); // 复制信息 BITMAPINFO BitmapInfo; ZeroMemory( &BitmapInfo, sizeof( BitmapInfo ) ); BitmapInfo.bmiHeader.biSize = sizeof( BitmapInfo.bmiHeader ); BitmapInfo.bmiHeader.biWidth = lSurfWidth; BitmapInfo.bmiHeader.biHeight = -lSurfHeight; BitmapInfo.bmiHeader.biPlanes = 1; BitmapInfo.bmiHeader.biBitCount = 32; m_lpDDS7->GetDC( &hDC ); int rc = StretchDIBits( hDC, 0, 0, lSurfWidth, lSurfHeight, 0, 0, lSurfWidth, lSurfHeight, PSDPixels, &BitmapInfo, DIB_RGB_COLORS, SRCCOPY ); m_lpDDS7->ReleaseDC( hDC ); if ( rc == GDI_ERROR ) { H_ARRAY_DELETE( PSDPixels ); #ifdef _DEBUG g_pHERR->OutDebugMsg( 3, H2DSERR_INVALID_PSD ); #endif return E_FAIL; } // 是否读取Alpha混合通道 if( ChannelCount > 3 ) { m_pbAlphaMask = new BYTE[ lSurfWidth * lSurfHeight ]; for ( int x = 0; x < lSurfWidth; x++ ) for ( int y = 0; y < lSurfHeight; y++ ) { m_pbAlphaMask[ ( y * lSurfWidth ) + x ] = 　PSDPixels[ ( ( ( y * lSurfHeight ) + x ) * 4 ) + 3 ]; } } else { m_pbAlphaMask = NULL; } H_ARRAY_DELETE( PSDPixels ); return DD_OK; } // PSD文件解包 　 void CHades2DSurface::UnPackPSD( FILE *fp,　// fp为PSD文件指针， DWORD dwWidth, // dwWidth、dwHeight为宽高， DWORD dwHeight, BYTE* pixels,　// pixels为解包目标指针， WORD ChannelCnt,　 // ChannelCnt为通道数， WORD Compression ) // Compression位压缩类型。 { int Default[4] = { 0, 0, 0, 255 }; int chn[4] = { 2, 1, 0, 3}; int PixelCount = dwWidth * dwHeight; if ( Compression ) { fseek( fp, dwHeight * ChannelCnt * 2, SEEK_CUR ); for ( int c = 0; c < 4; c++ ) { int pn = 0; int channel = chn[c]; if ( channel >= ChannelCnt ) { for ( pn=0; pn < PixelCount ;pn++ ) { pixels[ ( pn * 4 ) + channel ] = Default[ channel ]; } } else // 非压缩 { int count = 0; while( count < PixelCount ) { int len = fgetc( fp ); if( len == 128 ) { } else if ( len < 128 ) // 非RLE { len++; count += len; while(len) { pixels[ ( pn * 4 ) + channel ] = fgetc( fp ); pn++; len--; } } 　 else if ( len > 128 ) // RLE打包 { len ^= 0x0FF; len += 2; unsigned char val = fgetc( fp ); count += len; while( len ) { pixels[ ( pn * 4 ) + channel ] = val; pn++; len--; } } } } } } else { for ( int c=0; c < 4; c++ ) { int channel = chn[c]; if ( channel > ChannelCnt ) { for( int pn = 0; pn < PixelCount; pn++ ) { pixels[ ( pn * 4 ) + channel ] = Default[ channel ]; } } else { for( int n = 0; n < PixelCount; n++ ) { pixels[ ( n * 4 ) + channel ] = fgetc( fp ); } } } } } 本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/CometNet/archive/2010/02/16/5309971.aspx