{
if (cached_bit_count < bhi.bitsPerPixel)
{
if (cached_bit_count != 0)
throw new ImageReadException("Unexpected leftover bits: "
+ cached_bit_count + "/" + bhi.bitsPerPixel);
// cached_byte = 0;
cached_bit_count += 8;
cached_byte =
// (cached_byte << 8)
// |
(0xff & imageData[bytecount]);
// if (pixel_count < 500)
// System.out.println("reading byte on pixel # "
// + (pixel_count - 1));
bytecount++;
}
int cache_mask = (1 << bhi.bitsPerPixel) - 1;
int sample = cache_mask & (cached_byte >> (8 - bhi.bitsPerPixel));
cached_byte = 0xff & (cached_byte << bhi.bitsPerPixel);
cached_bit_count -= bhi.bitsPerPixel;
int rgb = getColorTableRGB(sample);
return rgb;
}
else if (bhi.bitsPerPixel == 8) // always grayscale?
{
int sample = 0xff & imageData[bytecount + 0];
int rgb = getColorTableRGB(sample);
bytecount += 1;
return rgb;
}
else if (bhi.bitsPerPixel == 16)
{
int data = bfp.read2Bytes("Pixel", is, "BMP Image Data");
int blue = (0x1f & (data >> 0)) << 3;
int green = (0x1f & (data >> 5)) << 3;
int red = (0x1f & (data >> 10)) << 3;
int alpha = 0xff;
int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
bytecount += 2;
return rgb;
}
else if (bhi.bitsPerPixel == 24)
{
int blue = 0xff & imageData[bytecount + 0];
int green = 0xff & imageData[bytecount + 1];
int red = 0xff & imageData[bytecount + 2];
int alpha = 0xff;
int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
bytecount += 3;
return rgb;
}
else if (bhi.bitsPerPixel == 32)
{
int blue = 0xff & imageData[bytecount + 0];
int green = 0xff & imageData[bytecount + 1];
int red = 0xff & imageData[bytecount + 2];
int alpha = 0xff;
int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
bytecount += 4;
return rgb;
}
throw new ImageReadException("Unknown BitsPerPixel: "
+ bhi.bitsPerPixel);
}