discuss.pixls.us

LittleCMS: fast_float is Fast!

ggbutcher (Glenn Butcher) October 22, 2020, 4:22pm 21

I probably oversold it; I simply used the libjpeg|tiff|png and libraw facilities available. For tiff it was especially challenging as the library doesn’t easily give up camera parameters. jpg gave me the memory block and I had to cobble together code to read it, which also is working with the relatively new eXif PNG chunk. libraw offers up data they feel is necessary to decode the raw image, not too much else, although recent versions have delved deeper in to the Makernotes. Code:

github.com

butcherg/rawproc/blob/master/src/jpegimage.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <map>
#include <string>

#ifdef __cplusplus
extern "C" {
#endif

#include <jpeglib.h>

#ifdef __cplusplus
}
#endif


#include "gimage/strutil.h"
#include "jpegexif.h"

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github.com

butcherg/rawproc/blob/master/src/jpegexif.cpp

#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <stdio.h>
#include "gimage/strutil.h"

#include <string>
#include <map>

//#include <sstream>
//#define tostr( x ) static_cast< std::ostringstream & >( \
        ( std::ostringstream() << std::dec << x ) ).str()

/*
template <typename T>
  std::string tostr ( T Number )
  {
     std::ostringstream ss;
     ss << Number;
     return ss.str();

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github.com

butcherg/rawproc/blob/master/src/pngimage.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>
#include <zlib.h>

#include <string>
#include <map>

#include "gimage/strutil.h"
#include "jpegexif.h"


const char * pngVersion()
{
	return PNG_LIBPNG_VER_STRING;
}

#define PNG_BYTES_TO_CHECK 8
bool _checkPNG(const char *filename)

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github.com

butcherg/rawproc/blob/master/src/rawimage.cpp

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#include <string>
#include <map>
#include <vector>
#include "gimage/strutil.h"

#ifndef USE_DCRAW
#include <libraw/libraw.h>
#else
#include <unistd.h>
#endif

#include <lcms2.h>
#include "gimage/gimage.h"
#include "nikonlensid.h"

//use for reading rgb(a) from libraw

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github.com

butcherg/rawproc/blob/master/src/tiffimage.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "tiffio.h"

#include <string>
#include <map>

#include "gimage/strutil.h"


const char * tiffVersion()
{
	return TIFFGetVersion();
}

bool _checkTIFF(const char *filename)
{
	TIFFSetErrorHandler(0);
	if (TIFFOpen(filename, "r") != NULL) return true;

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I offer an 'Exif…" menu item that runs whatever metadata command line tool and displays the output in a listbox that can be filtered grep-style. That’s rather handy, but not closely coupled with the raw processing.

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