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//-----------------------------------------------------------------------------
//
// ImageLib Sources
// Copyright (C) 2000-2009 by Denton Woods
// Last modified: 01/30/2009
//
// Filename: src-IL/src/il_size.c
//
// Description: Determines the size of output files for lump writing.
//
//-----------------------------------------------------------------------------
#include "il_internal.h"
ILuint iTargaSize(void);
ILuint CurPos; // Fake "file" pointer.
ILuint MaxPos;
//! Fake seek function
ILint ILAPIENTRY iSizeSeek(ILint Offset, ILuint Mode)
{
switch (Mode)
{
case IL_SEEK_SET:
CurPos = Offset;
if (CurPos > MaxPos)
MaxPos = CurPos;
break;
case IL_SEEK_CUR:
CurPos = CurPos + Offset;
break;
case IL_SEEK_END:
CurPos = MaxPos + Offset; // Offset should be negative in this case.
break;
default:
ilSetError(IL_INTERNAL_ERROR); // Should never happen!
return -1; // Error code
}
if (CurPos > MaxPos)
MaxPos = CurPos;
return 0; // Code for success
}
ILuint ILAPIENTRY iSizeTell(void)
{
return CurPos;
}
ILint ILAPIENTRY iSizePutc(ILubyte Char)
{
CurPos++;
if (CurPos > MaxPos)
MaxPos = CurPos;
return Char;
}
ILint ILAPIENTRY iSizeWrite(const void *Buffer, ILuint Size, ILuint Number)
{
CurPos += Size * Number;
if (CurPos > MaxPos)
MaxPos = CurPos;
return Number;
}
//@TODO: Do computations for uncompressed formats without going through the
// whole writing process.
//! Returns the size of the memory buffer needed to save the current image into this Type.
// A return value of 0 is an error.
ILuint ilDetermineSize(ILenum Type)
{
MaxPos = CurPos = 0;
iSetOutputFake(); // Sets iputc, iwrite, etc. to functions above.
switch (Type)
{
#ifndef IL_NO_BMP
case IL_BMP:
ilSaveBmpL(NULL, 0);
break;
#endif//IL_NO_BMP
#ifndef IL_NO_DDS
case IL_DDS:
ilSaveDdsL(NULL, 0);
break;
#endif//IL_NO_DDS
#ifndef IL_NO_EXR
case IL_EXR:
ilSaveExrL(NULL, 0);
break;
#endif//IL_NO_EXR
#ifndef IL_NO_HDR
case IL_HDR:
ilSaveHdrL(NULL, 0);
break;
#endif//IL_NO_HDR
#ifndef IL_NO_JP2
case IL_JP2:
ilSaveJp2L(NULL, 0);
break;
#endif//IL_NO_JP2
#ifndef IL_NO_JPG
case IL_JPG:
ilSaveJpegL(NULL, 0);
break;
#endif//IL_NO_JPG
#ifndef IL_NO_PCX
case IL_PCX:
ilSavePcxL(NULL, 0);
break;
#endif//IL_NO_PCX
#ifndef IL_NO_PNG
case IL_PNG:
ilSavePngL(NULL, 0);
break;
#endif//IL_NO_PNG
#ifndef IL_NO_PNM
case IL_PNM:
ilSavePnmL(NULL, 0);
break;
#endif//IL_NO_PNM
#ifndef IL_NO_PSD
case IL_PSD:
ilSavePsdL(NULL, 0);
break;
#endif//IL_NO_PSD
#ifndef IL_NO_RAW
case IL_RAW:
ilSaveRawL(NULL, 0);
break;
#endif//IL_NO_RAW
#ifndef IL_NO_SGI
case IL_SGI:
ilSaveSgiL(NULL, 0);
break;
#endif//IL_NO_SGI
#ifndef IL_NO_TGA
case IL_TGA:
//ilSaveTargaL(NULL, 0);
return iTargaSize();
break;
#endif//IL_NO_TGA
#ifndef IL_NO_TIF
case IL_TIF:
ilSaveTiffL(NULL, 0);
break;
#endif//IL_NO_TIF
#ifndef IL_NO_WBMP
case IL_WBMP:
ilSaveWbmpL(NULL, 0);
break;
#endif//IL_NO_WBMP
default:
// 0 is an error for this.
ilSetError(IL_INVALID_ENUM);
return 0;
}
return MaxPos;
}
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