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# /home/dwoods/DevIL/src-IL/include/il_bmp.h

    00001 //-----------------------------------------------------------------------------
    00002 //
    00003 // ImageLib Sources
    00004 // Copyright (C) 2000-2002 by Denton Woods
    00005 // Last modified: 09/01/2003 <--Y2K Compliant! =]
    00006 //
    00007 // Filename: src-IL/include/il_bmp.h
    00008 //
    00009 // Description: Reads and writes to a bitmap (.bmp) file.
    00010 //
    00011 //-----------------------------------------------------------------------------
    00012
    00013
    00014 #ifndef BMP_H
    00015 #define BMP_H
    00016
    00017 #include "il_internal.h"
    00018
    00019 #ifdef _WIN32
    00020         #pragma pack(push, bmp_struct, 1)
    00021 #endif
    00022 typedef struct BMPHEAD {
    00023         ILushort        bfType;
    00024         ILint           bfSize;
    00025         ILuint          bfReserved;
    00026         ILint           bfDataOff;
    00027         ILint           biSize;
    00028         ILint           biWidth;
    00029         ILint           biHeight;
    00030         ILshort         biPlanes;
    00031         ILshort         biBitCount;
    00032         ILint           biCompression;
    00033         ILint           biSizeImage;
    00034         ILint           biXPelsPerMeter;
    00035         ILint           biYPelsPerMeter;
    00036         ILint           biClrUsed;
    00037         ILint           biClrImportant;
    00038 } IL_PACKSTRUCT BMPHEAD;
    00039
    00040 typedef struct OS2_HEAD
    00041 {
    00042         // Bitmap file header.
    00043         ILushort        bfType;
    00044         ILuint          biSize;
    00045         ILshort         xHotspot;
    00046         ILshort         yHotspot;
    00047         ILuint          DataOff;
    00048
    00049         // Bitmap core header.
    00050         ILuint          cbFix;
    00051         //2003-09-01: changed cx, cy to ushort according to MSDN
    00052         ILushort                cx;
    00053         ILushort                cy;
    00054         ILushort        cPlanes;
    00055         ILushort        cBitCount;
    00056 } IL_PACKSTRUCT OS2_HEAD;
    00057 #ifdef _WIN32
    00058         #pragma pack(pop, bmp_struct)
    00059 #endif
    00060
    00061 // Internal functions
    00062 ILboolean       iGetBmpHead(BMPHEAD * const Header);
    00063 ILboolean       iGetOS2Head(OS2_HEAD * const Header);
    00064 ILboolean       iIsValidBmp();
    00065 ILboolean       iCheckBmp(const BMPHEAD *CONST_RESTRICT Header);
    00066 ILboolean       iCheckOS2(const OS2_HEAD *CONST_RESTRICT Header);
    00067 ILboolean       iLoadBitmapInternal();
    00068 ILboolean       iSaveBitmapInternal();
    00069 ILboolean       ilReadUncompBmp(BMPHEAD *Info);
    00070 ILboolean       ilReadRLE8Bmp(BMPHEAD *Info);
    00071 ILboolean       ilReadRLE4Bmp(BMPHEAD *Info);
    00072 ILboolean       iGetOS2Bmp(OS2_HEAD *Header);
    00073
    00074 #ifdef IL_BMP_C
    00075 #undef NOINLINE
    00076 #undef INLINE
    00077 #define INLINE
    00078 #endif
    00079
    00080 #ifndef NOINLINE
    00081 INLINE void GetShiftFromMask(const ILuint Mask, ILuint * CONST_RESTRICT ShiftLeft, ILuint * CONST_RESTRICT ShiftRight) {
    00082         ILuint Temp, i;
    00083
    00084         if( Mask == 0 ) {
    00085                 *ShiftLeft = *ShiftRight = 0;
    00086                 return;
    00087         }
    00088
    00089         Temp = Mask;
    00090         for( i = 0; i < 32; i++, Temp >>= 1 ) {
    00091                 if( Temp & 1 )
    00092                         break;
    00093         }
    00094         *ShiftRight = i;
    00095
    00096         // Temp is preserved, so use it again:
    00097         for( i = 0; i < 8; i++, Temp >>= 1 ) {
    00098                 if( !(Temp & 1) )
    00099                         break;
    00100         }
    00101         *ShiftLeft = 8 - i;
    00102
    00103         return;
    00104 }
    00105 #endif
    00106
    00107 #endif//BMP_H