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#include "advwin32.h"
#ifndef DB_LEVEL
#define DB_LEVEL 4
#endif
#include "db.h"
#include "awTexLd.hpp"
// PNM loaders
class AwPnmLoader : public AwTl::TypicalTexFileLoader
{
protected:
void _AWTL_VARARG ParseHeader(unsigned nFields,...);
MediaMedium * m_pMedium;
};
void _AWTL_VARARG AwPnmLoader::ParseHeader(unsigned nFields,...)
{
va_list ap;
va_start(ap,nFields);
m_pMedium->MovePos(+2); // skip past magic
BYTE c = 0;
while (nFields)
{
unsigned * fieldP = va_arg(ap,unsigned *);
bool comment = false;
bool done = false;
do
{
MediaRead(m_pMedium, &c);
switch (c)
{
case '\n':
comment = false;
break;
case '#':
comment = true;
break;
default:
if (!comment && !isspace(c))
done = true;
}
}
while (!done);
char bufA[512];
char * bufP = bufA;
do
{
*bufP++ = c;
MediaRead(m_pMedium, &c);
}
while (!isspace(c));
*bufP = 0;
*fieldP = atoi(bufA);
-- nFields;
}
// c should now be a newline character
if ('\n'!=c)
awTlLastErr = AW_TLE_BADFILEDATA;
va_end(ap);
}
class AwPpmLoader : public AwPnmLoader
{
protected:
virtual void LoadHeaderInfo(MediaMedium * pMedium);
virtual AwTl::Colour * GetPalette();
virtual void LoadNextRow(AwTl::PtrUnion pRow);
unsigned pm_maxval;
};
void AwPpmLoader::LoadHeaderInfo(MediaMedium * pMedium)
{
m_pMedium = pMedium;
db_log4("\tLoading a PPM file");
ParseHeader(3,&m_nWidth,&m_nHeight,&pm_maxval);
db_logf4(("\tPPM_maxval is %u",pm_maxval));
if (pm_maxval > 255)
{
awTlLastErr = AW_TLE_BADFILEFORMAT;
db_log3("AwCreateTexture(): PPM_maxval too large");
}
m_nPaletteSize = 0;
}
AwTl::Colour * AwPpmLoader::GetPalette()
{
// never palettized
return NULL;
}
void AwPpmLoader::LoadNextRow(AwTl::PtrUnion pRow)
{
if (pm_maxval != 255)
for (unsigned colcount = m_nWidth; colcount; --colcount)
{
BYTE byte;
MediaRead(m_pMedium,&byte);
pRow.colourP->r = static_cast<BYTE>(static_cast<unsigned>(byte)*255/pm_maxval);
MediaRead(m_pMedium,&byte);
pRow.colourP->g = static_cast<BYTE>(static_cast<unsigned>(byte)*255/pm_maxval);
MediaRead(m_pMedium,&byte);
pRow.colourP->b = static_cast<BYTE>(static_cast<unsigned>(byte)*255/pm_maxval);
++pRow.colourP;
}
else
for (unsigned colcount = m_nWidth; colcount; --colcount)
{
MediaRead(m_pMedium,&pRow.colourP->r);
MediaRead(m_pMedium,&pRow.colourP->g);
MediaRead(m_pMedium,&pRow.colourP->b);
++pRow.colourP;
}
}
class AwPgmLoader : public AwPnmLoader
{
protected:
virtual void LoadHeaderInfo(MediaMedium * pMedium);
virtual AwTl::Colour * GetPalette();
virtual void LoadNextRow(AwTl::PtrUnion pRow);
unsigned pm_maxval;
};
void AwPgmLoader::LoadHeaderInfo(MediaMedium * pMedium)
{
m_pMedium = pMedium;
db_log4("\tLoading a PGM file");
ParseHeader(3,&m_nWidth,&m_nHeight,&pm_maxval);
db_logf4(("\tPGM_maxval is %u",pm_maxval));
if (pm_maxval > 255)
{
awTlLastErr = AW_TLE_BADFILEFORMAT;
db_log3("AwCreateTexture(): PGM_maxval too large");
}
m_nPaletteSize = pm_maxval+1;
}
AwTl::Colour * AwPgmLoader::GetPalette()
{
db_assert1(m_nPaletteSize);
db_assert1(m_pPalette);
unsigned step8 = (256*255)/pm_maxval;
unsigned val8 = 127;
AwTl::Colour * pmP = m_pPalette;
for (unsigned pc = m_nPaletteSize; pc; --pc,++pmP,val8+=step8)
pmP->r = pmP->g = pmP->b = static_cast<BYTE>(val8/256);
return m_pPalette;
}
void AwPgmLoader::LoadNextRow(AwTl::PtrUnion pRow)
{
m_pMedium->ReadBlock(pRow,m_nWidth);
}
class AwPbmLoader : public AwPnmLoader
{
protected:
virtual void LoadHeaderInfo(MediaMedium * pMedium);
virtual AwTl::Colour * GetPalette();
virtual void LoadNextRow(AwTl::PtrUnion pRow);
};
void AwPbmLoader::LoadHeaderInfo(MediaMedium * pMedium)
{
m_pMedium = pMedium;
db_log4("\tLoading a PBM file");
ParseHeader(2,&m_nWidth,&m_nHeight);
m_nPaletteSize = 2;
}
AwTl::Colour * AwPbmLoader::GetPalette()
{
db_assert1(m_nPaletteSize);
db_assert1(m_pPalette);
m_pPalette[0].r = 0;
m_pPalette[0].g = 0;
m_pPalette[0].b = 0;
m_pPalette[1].r = 255;
m_pPalette[1].g = 255;
m_pPalette[1].b = 255;
return m_pPalette;
}
void AwPbmLoader::LoadNextRow(AwTl::PtrUnion pRow)
{
unsigned shift = 0;
BYTE byte = 0;
for (unsigned colcount = m_nWidth; colcount; --colcount)
{
if (!shift)
{
shift = 8;
MediaRead(m_pMedium,&byte);
byte = (BYTE) ~byte;
}
--shift;
*pRow.byteP++ = static_cast<BYTE>(byte>>shift & 1);
}
}
#ifdef _MSC_VER
// VC5.0 tries to compile out code that is in a library
// and it thinks isn't being used
#line 228
#endif
AWTEXLD_IMPLEMENT_DYNCREATE("P6",AwPpmLoader)
AWTEXLD_IMPLEMENT_DYNCREATE("P5",AwPgmLoader)
AWTEXLD_IMPLEMENT_DYNCREATE("P4",AwPbmLoader)
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