PLPixel32 PLPPMDecoder::readASCIIPixel32( int MaxSampleValue, PLDataSource *pDataSrc) {
skipPpmASCIISeparators(pDataSrc);
PLBYTE r = readASCIIDecimal(pDataSrc);
skipPpmASCIISeparators(pDataSrc);
PLBYTE g = readASCIIDecimal(pDataSrc);
skipPpmASCIISeparators(pDataSrc);
PLBYTE b = readASCIIDecimal(pDataSrc);
if(MaxSampleValue != 255) {
r = (r * 255) / MaxSampleValue;
g = (g * 255) / MaxSampleValue;
b = (b * 255) / MaxSampleValue;
}
PLPixel32 Dest;
Dest.Set(r, g, b, 0);
return Dest;
}
void clearPixel(PLPixel32& theResult ) { theResult.Set(0,0,0,0); }
void PLTIFFDecoder::doHiColor (TIFF * tif, PLBmpBase * pBmp, uint16 SamplePerPixel)
{
int ok;
PLULONG x, y;
TIFFRGBAImage img;
char emsg[1024];
PLBYTE * pBits;
ok = TIFFRGBAImageBegin(&img, tif, 0, emsg);
if (ok == 0)
{
raiseError (PL_ERRWRONG_SIGNATURE, "TIFF subformat not supported.");
}
//bool bHasAlpha = pBmp->HasAlpha();
PLASSERT (int(img.width) == pBmp->GetWidth());
PLASSERT (int(img.height) == pBmp->GetHeight());
PLASSERT (pBmp->GetBitsPerPixel() == 32);
pBits = new PLBYTE [img.width*img.height*4];
if (pBits == NULL)
raiseError (PL_ERRNO_MEMORY, "Out of memory allocating TIFF buffer.");
// Hack for photoshop alpha channel support
if (SamplePerPixel == 4 && img.bitspersample == 8 && img.photometric == 2)
{
img.put.contig = putRGBAAcontig8bittile;
}
ok = TIFFRGBAImageGet(&img, (uint32 *) pBits, img.width, img.height);
if (!ok)
{
TIFFRGBAImageEnd(&img);
raiseError (PL_ERRWRONG_SIGNATURE, m_szLastErr);
}
PLPixel32 ** pLineArray = pBmp->GetLineArray32();
// Correct the byte ordering. This could be replaced by appropriate
// putRGBAcontig... routines.
for (y=0; y<img.height; y++)
{
PLBYTE * pSrc = pBits+(img.height-y-1)*img.width*4;
PLPixel32 * pPixel = pLineArray[y];
for (x=0; x<img.width; x++)
{
#ifdef WORDS_BIGENDIAN
pPixel->Set (*(pSrc+3), *(pSrc+2), *(pSrc+1), *(pSrc));
#else
pPixel->Set (*pSrc, *(pSrc+1), *(pSrc+2), *(pSrc+3));
#endif
pPixel++;
pSrc += 4;
}
}
// Clean up.
delete [] pBits;
TIFFRGBAImageEnd(&img);
}