void read_raw_data( string const& fn, uint32_t w, uint32_t h, tImgLinear& rimg ) {
vector<uint8_t> buf;
try {
bin_data::tReadBin()( fn, buf );
} catch( bin_data::tBinReadEx& ) {
throw;
}
if( w * h == buf.size() ) {
rimg.set_mono8();
}
if( w * h * 3 == buf.size() ) {
rimg.set_rgb();
}
if( rimg.is_none() ) {
string s = "Couldn't read raw file: '" + fn + "'";
throw tImgReadEx( s );
}
rimg.size() = tSize( w, h );
rimg.alloc_data_buffer();
rimg.insert_data( buf, 0 );
}
void read( string fn, tImgLinear& rimg ) {
std::vector<uint8_t> buf;
bin_read::t_bin_read reader;
reader( fn, buf );
FILEHEADER const* fileheader = referenceToFILEHEADER( buf );
uint16_t sig = fileheader->signature;
if( sig != BMP_signature ) {
return ;
}
if( buf.size() == fileheader->size ) {
try {
INFO const* bitmapinfoheader = referenceToINFO( buf );
uint32_t w = info_width( bitmapinfoheader );
uint32_t h = info_height( bitmapinfoheader );
// copy data to tImgLinear
rimg.size() = tSize( w, h );
uint8_t const* pbuf = &buf[0];
uint8_t const* dataptr = pbuf + fileheader->offset_bits;
// 8 bit
if( bitmapinfoheader->bit_count == 8 ) {
// LUT is not supported, convert to rgb, if lut is not an gray ramp lut
tBGRA const* lut = referenceToLUT( buf );
if( is_ramp( lut ) ) {
rimg.set_mono8();
rimg.alloc_data_buffer();
read_8bit( dataptr, rimg.size(), rimg.rows() );
return;
}
if( is_zero( lut ) ) {
rimg.set_mono8();
rimg.alloc_data_buffer();
read_8bit( dataptr, rimg.size(), rimg.rows() );
return;
}
rimg.set_rgb();
rimg.alloc_data_buffer();
read_8bit_as_rgb( lut, dataptr, rimg.size(), rimg.rows() );
return;
}
// 24 bit
if( bitmapinfoheader->bit_count == 24 ) {
rimg.set_rgb();
rimg.alloc_data_buffer();
read_rgb( dataptr, rimg.size(), rimg.rows() );
}
if( bitmapinfoheader->bit_count == 32 ) {
// read an rgba image, write an rgb image, alpha is lost
rimg.set_rgba();
rimg.alloc_data_buffer();
read_rgba( dataptr, rimg.size(), rimg.rows() );
}
} catch( tImgAllocEx& ex ) {
throw tImgReadEx( ex.what() );
}
}
}