bool CSurface8::Read(CStdStream &hGroup)
{
int cnt,lcnt;
C4BMP256Info BitmapInfo;
// read bmpinfo-header
if (!hGroup.Read(&BitmapInfo,sizeof(C4BMPInfo))) return false;
// is it 8bpp?
if (BitmapInfo.Info.biBitCount == 8)
{
if (!hGroup.Read(((BYTE *) &BitmapInfo)+sizeof(C4BMPInfo),sizeof(BitmapInfo)-sizeof(C4BMPInfo))) return false;
if (!hGroup.Advance(BitmapInfo.FileBitsOffset())) return false;
}
else
{
// read 24bpp
if (BitmapInfo.Info.biBitCount != 24) return false;
if (!hGroup.Advance(((C4BMPInfo) BitmapInfo).FileBitsOffset())) return false;
}
// Create and lock surface
if (!Create(BitmapInfo.Info.biWidth,BitmapInfo.Info.biHeight)) return false;
if (BitmapInfo.Info.biBitCount == 8)
{
// Copy palette
for (cnt=0; cnt<256; cnt++)
{
pPal->Colors[cnt] = C4RGB(BitmapInfo.Colors[cnt].rgbRed,
BitmapInfo.Colors[cnt].rgbGreen,
BitmapInfo.Colors[cnt].rgbBlue);
}
}
// create line buffer
int iBufSize=DWordAligned(BitmapInfo.Info.biWidth*BitmapInfo.Info.biBitCount/8);
BYTE *pBuf = new BYTE[iBufSize];
// Read lines
for (lcnt=Hgt-1; lcnt>=0; lcnt--)
{
if (!hGroup.Read(pBuf, iBufSize))
{ Clear(); delete [] pBuf; return false; }
BYTE *pPix=pBuf;
for (int x=0; x<BitmapInfo.Info.biWidth; ++x)
switch (BitmapInfo.Info.biBitCount)
{
case 8:
SetPix(x, lcnt, *pPix++);
break;
case 24:
return false;
break;
}
}
// free buffer again
delete [] pBuf;
return true;
}
bool C4Surface::ReadBMP(CStdStream &hGroup, int iFlags)
{
int lcnt;
C4BMP256Info BitmapInfo;
// read bmpinfo-header
if (!hGroup.Read(&BitmapInfo,sizeof(C4BMPInfo))) return false;
// is it 8bpp?
if (BitmapInfo.Info.biBitCount == 8)
{
if (!hGroup.Read(((BYTE *) &BitmapInfo)+sizeof(C4BMPInfo),
std::min(sizeof(BitmapInfo)-sizeof(C4BMPInfo),sizeof(BitmapInfo)-sizeof(C4BMPInfo)+BitmapInfo.FileBitsOffset())))
return false;
if (!hGroup.Advance(BitmapInfo.FileBitsOffset())) return false;
}
else
{
// read 24bpp
if (BitmapInfo.Info.biBitCount != 24) return false;
if (!hGroup.Advance(((C4BMPInfo) BitmapInfo).FileBitsOffset())) return false;
}
// Create and lock surface
if (!Create(BitmapInfo.Info.biWidth,BitmapInfo.Info.biHeight, iFlags)) return false;
if (!Lock()) { Clear(); return false; }
// create line buffer
int iBufSize=DWordAligned(BitmapInfo.Info.biWidth*BitmapInfo.Info.biBitCount/8);
BYTE *pBuf = new BYTE[iBufSize];
// Read lines
for (lcnt=Hgt-1; lcnt>=0; lcnt--)
{
if (!hGroup.Read(pBuf, iBufSize))
{ Clear(); delete [] pBuf; return false; }
BYTE *pPix=pBuf;
for (int x=0; x<BitmapInfo.Info.biWidth; ++x)
switch (BitmapInfo.Info.biBitCount)
{
case 8:
SetPixDw(x, lcnt, C4RGB(
BitmapInfo.Colors[*pPix].rgbRed,
BitmapInfo.Colors[*pPix].rgbGreen,
BitmapInfo.Colors[*pPix].rgbBlue));
++pPix;
break;
case 24:
SetPixDw(x, lcnt, C4RGB(pPix[0], pPix[1], pPix[2]));
pPix+=3;
break;
}
}
// free buffer again
delete [] pBuf;
Unlock();
return true;
}
