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#include "fixer.h"
#ifndef DB_LEVEL
#define DB_LEVEL 4
#endif
#include "db.h"
#include "awtexld.hpp"
// BMP Loader
class AwBmpLoader : public AwTl::TypicalTexFileLoader
{
protected:
virtual void LoadHeaderInfo(MediaMedium * pMedium);
virtual AwTl::Colour * GetPalette();
virtual bool AreRowsReversed();
virtual void LoadNextRow(AwTl::PtrUnion pRow);
WORD bmp_bitdepth;
DWORD bmp_offset;
DWORD bmp_headsize;
unsigned bmp_filepitchpad;
unsigned bmp_bitmask;
MediaMedium * m_pMedium;
};
void AwBmpLoader::LoadHeaderInfo(MediaMedium * pMedium)
{
m_pMedium = pMedium; // store for later
db_log4("\tLoading a BMP file");
pMedium->MovePos(+10); // 2 bytes BM (magic) and 4 bytes bmp_filesize and 4 bytes reserved
MediaRead(pMedium,&bmp_offset);
MediaRead(pMedium,&bmp_headsize);
// 12 for OS/2 1.x 40 for Windows, 64 for OS/2 2.x
if (12 != bmp_headsize && 40 != bmp_headsize && 64 != bmp_headsize)
{
awTlLastErr = AW_TLE_BADFILEFORMAT;
db_logf3(("AwCreateTexture(): ERROR: BMP_headersize (%u) is not a recognized BMP format",bmp_headsize));
}
#if DB_LEVEL >= 4
switch (bmp_headsize)
{
case 12:
db_log4("\tBMP format is OS/2 1.x");
break;
case 40:
db_log4("\tBMP format is Windows 3.x");
break;
case 64:
db_log4("\tBMP format is OS/2 2.x");
}
#endif
if (bmp_headsize >= 40)
{
DWORD width, height;
MediaRead(pMedium,&width);
MediaRead(pMedium,&height);
m_nWidth = width;
m_nHeight = height;
}
else
{
WORD width, height;
MediaRead(pMedium,&width);
MediaRead(pMedium,&height);
m_nWidth = width;
m_nHeight = height;
}
// next WORD is planes and should == 1
WORD bmp_planes = 0; // ALEX: added in initialization to prevent compiler warnings
MediaRead(pMedium,&bmp_planes);
if (1!=bmp_planes)
{
awTlLastErr = AW_TLE_BADFILEDATA;
db_log3("AwCreateTexture(): ERROR: BMP_planes should be 1");
}
MediaRead(pMedium,&bmp_bitdepth);
db_logf4(("\tBMP_bitdepth is %hd",bmp_bitdepth));
if (1!=bmp_bitdepth && 2!=bmp_bitdepth && 4!=bmp_bitdepth && 8!=bmp_bitdepth && 24!=bmp_bitdepth)
{
awTlLastErr = AW_TLE_BADFILEDATA;
db_logf3(("AwCreateTexture(): ERROR: BMP_bitdepth (%u) should be 1,2,4,8 or 24",bmp_bitdepth));
}
if (bmp_headsize >= 40)
{
// next DWORD is compression, not supported so only accept 0
DWORD compression = 0;
MediaRead(pMedium,&compression);
if (compression)
{
db_log3("AwCreateTexture(): ERROR: Cannont read compressed BMP files");
awTlLastErr = AW_TLE_BADFILEFORMAT;
}
// DWORD bmp_size - ignored, 2xDWORDS ignored
pMedium->MovePos(+12);
DWORD palette_size = 0; // ALEX: added in initialization to prevent compiler warnings
MediaRead(pMedium,&palette_size);
m_nPaletteSize = palette_size;
// skip to the start of the palette if there would be one
pMedium->MovePos(bmp_headsize-36);
}
else
{
m_nPaletteSize = 0;
}
bmp_offset -= (bmp_headsize+14);
if (!m_nPaletteSize && bmp_bitdepth<=8)
m_nPaletteSize = 1<<bmp_bitdepth;
if (m_nPaletteSize)
bmp_offset -= bmp_headsize >= 40 ? m_nPaletteSize*4 : m_nPaletteSize*3;
db_logf4(("\tBMP_palettesize is %u",m_nPaletteSize));
bmp_filepitchpad = (~(m_nWidth*bmp_bitdepth-1))/8 & 3;
db_logf4(("\tBMP has %u bytes padding per row",bmp_filepitchpad));
bmp_bitmask = (1<<bmp_bitdepth)-1;
}
AwTl::Colour * AwBmpLoader::GetPalette()
{
db_assert1(m_nPaletteSize);
db_assert1(m_pPalette);
if (m_nPaletteSize > 256)
{
awTlLastErr = AW_TLE_BADFILEDATA;
db_log3("AwCreateTexture(): ERROR: BMP_palettesize is too large");
}
else
{
AwTl::Colour * pmP = m_pPalette;
for (unsigned pc = m_nPaletteSize; pc; --pc,++pmP)
{
MediaRead(m_pMedium,&pmP->b);
MediaRead(m_pMedium,&pmP->g);
MediaRead(m_pMedium,&pmP->r);
if (bmp_headsize >= 40) m_pMedium->MovePos(+1);
}
}
// skip to the start of the pixel data
m_pMedium->MovePos(bmp_offset);
return m_pPalette;
}
bool AwBmpLoader::AreRowsReversed()
{
return true;
}
void AwBmpLoader::LoadNextRow(AwTl::PtrUnion pRow)
{
if (m_nPaletteSize)
{
unsigned shift = 0;
BYTE byte = 0; // Not needed.
for (unsigned colcount = m_nWidth; colcount; --colcount)
{
if (!shift)
{
shift = 8;
MediaRead(m_pMedium, &byte);
}
shift -= bmp_bitdepth;
*pRow.byteP++ = static_cast<BYTE>(byte>>shift & bmp_bitmask);
}
}
else
{
for (unsigned colcount = m_nWidth; colcount; --colcount)
{
MediaRead(m_pMedium,&pRow.colourP->b);
MediaRead(m_pMedium,&pRow.colourP->g);
MediaRead(m_pMedium,&pRow.colourP->r);
++pRow.colourP;
}
}
m_pMedium->MovePos(bmp_filepitchpad);
}
AWTEXLD_IMPLEMENT_DYNCREATE("BM",AwBmpLoader)
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