/* $Id: rgb2ycbcr.c,v 1.9.2.2 2010-06-08 18:50:44 bfriesen Exp $ */

/*

 * Copyright (c) 1991-1997 Sam Leffler

 * Copyright (c) 1991-1997 Silicon Graphics, Inc.

 *

 * Permission to use, copy, modify, distribute, and sell this software and 

 * its documentation for any purpose is hereby granted without fee, provided

 * that (i) the above copyright notices and this permission notice appear in

 * all copies of the software and related documentation, and (ii) the names of

 * Sam Leffler and Silicon Graphics may not be used in any advertising or

 * publicity relating to the software without the specific, prior written

 * permission of Sam Leffler and Silicon Graphics.

 * 

 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 

 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 

 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  

 * 

 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR

 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,

 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 

 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 

 * OF THIS SOFTWARE.

 */

#include "tif_config.h"

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#ifdef HAVE_UNISTD_H

# include <unistd.h>

#endif

#include "tiffiop.h"

#include "tiffio.h"

#define	streq(a,b)	(strcmp(a,b) == 0)

#define	CopyField(tag, v) \

    if (TIFFGetField(in, tag, &v)) TIFFSetField(out, tag, v)

#ifndef howmany

#define	howmany(x, y)	(((x)+((y)-1))/(y))

#endif

#define	roundup(x, y)	(howmany(x,y)*((uint32)(y)))

#define	LumaRed		ycbcrCoeffs[0]

#define	LumaGreen	ycbcrCoeffs[1]

#define	LumaBlue	ycbcrCoeffs[2]

uint16	compression = COMPRESSION_PACKBITS;

uint32	rowsperstrip = (uint32) -1;

uint16	horizSubSampling = 2;		/* YCbCr horizontal subsampling */

uint16	vertSubSampling = 2;		/* YCbCr vertical subsampling */

float	ycbcrCoeffs[3] = { .299F, .587F, .114F };

/* default coding range is CCIR Rec 601-1 with no headroom/footroom */

float	refBlackWhite[6] = { 0.F, 255.F, 128.F, 255.F, 128.F, 255.F };

static	int tiffcvt(TIFF* in, TIFF* out);

static	void usage(int code);

static	void setupLumaTables(void);

int

main(int argc, char* argv[])

{

	TIFF *in, *out;

	int c;

	extern int optind;

	extern char *optarg;

	while ((c = getopt(argc, argv, "c:h:r:v:z")) != -1)

		switch (c) {

		case 'c':

			if (streq(optarg, "none"))

			    compression = COMPRESSION_NONE;

			else if (streq(optarg, "packbits"))

			    compression = COMPRESSION_PACKBITS;

			else if (streq(optarg, "lzw"))

			    compression = COMPRESSION_LZW;

			else if (streq(optarg, "jpeg"))

			    compression = COMPRESSION_JPEG;

			else if (streq(optarg, "zip"))

			    compression = COMPRESSION_ADOBE_DEFLATE;

			else

			    usage(-1);

			break;

		case 'h':

			horizSubSampling = atoi(optarg);

			break;

		case 'v':

			vertSubSampling = atoi(optarg);

			break;

		case 'r':

			rowsperstrip = atoi(optarg);

			break;

		case 'z':	/* CCIR Rec 601-1 w/ headroom/footroom */

			refBlackWhite[0] = 16.;

			refBlackWhite[1] = 235.;

			refBlackWhite[2] = 128.;

			refBlackWhite[3] = 240.;

			refBlackWhite[4] = 128.;

			refBlackWhite[5] = 240.;

			break;

		case '?':

			usage(0);

			/*NOTREACHED*/

		}

	if (argc - optind < 2)

		usage(-1);

	out = TIFFOpen(argv[argc-1], "w");

	if (out == NULL)

		return (-2);

	setupLumaTables();

	for (; optind < argc-1; optind++) {

		in = TIFFOpen(argv[optind], "r");

		if (in != NULL) {

			do {

				if (!tiffcvt(in, out) ||

				    !TIFFWriteDirectory(out)) {

					(void) TIFFClose(out);

					return (1);

				}

			} while (TIFFReadDirectory(in));

			(void) TIFFClose(in);

		}

	}

	(void) TIFFClose(out);

	return (0);

}

float	*lumaRed;

float	*lumaGreen;

float	*lumaBlue;

float	D1, D2;

int	Yzero;

static float*

setupLuma(float c)

{

	float *v = (float *)_TIFFmalloc(256 * sizeof (float));

	int i;

	for (i = 0; i < 256; i++)

		v[i] = c * i;

	return (v);

}

static unsigned

V2Code(float f, float RB, float RW, int CR)

{

	unsigned int c = (unsigned int)((((f)*(RW-RB)/CR)+RB)+.5);

	return (c > 255 ? 255 : c);

}

static void

setupLumaTables(void)

{

	lumaRed = setupLuma(LumaRed);

	lumaGreen = setupLuma(LumaGreen);

	lumaBlue = setupLuma(LumaBlue);

	D1 = 1.F/(2.F - 2.F*LumaBlue);

	D2 = 1.F/(2.F - 2.F*LumaRed);

	Yzero = V2Code(0, refBlackWhite[0], refBlackWhite[1], 255);

}

static void

cvtClump(unsigned char* op, uint32* raster, uint32 ch, uint32 cw, uint32 w)

{

	float Y, Cb = 0, Cr = 0;

	uint32 j, k;

	/*

	 * Convert ch-by-cw block of RGB

	 * to YCbCr and sample accordingly.

	 */

	for (k = 0; k < ch; k++) {

		for (j = 0; j < cw; j++) {

			uint32 RGB = (raster - k*w)[j];

			Y = lumaRed[TIFFGetR(RGB)] +

			    lumaGreen[TIFFGetG(RGB)] +

			    lumaBlue[TIFFGetB(RGB)];

			/* accumulate chrominance */

			Cb += (TIFFGetB(RGB) - Y) * D1;

			Cr += (TIFFGetR(RGB) - Y) * D2;

			/* emit luminence */

			*op++ = V2Code(Y,

			    refBlackWhite[0], refBlackWhite[1], 255);

		}

		for (; j < horizSubSampling; j++)

			*op++ = Yzero;

	}

	for (; k < vertSubSampling; k++) {

		for (j = 0; j < horizSubSampling; j++)

			*op++ = Yzero;

	}

	/* emit sampled chrominance values */

	*op++ = V2Code(Cb / (ch*cw), refBlackWhite[2], refBlackWhite[3], 127);

	*op++ = V2Code(Cr / (ch*cw), refBlackWhite[4], refBlackWhite[5], 127);

}

#undef LumaRed

#undef LumaGreen

#undef LumaBlue

#undef V2Code

/*

 * Convert a strip of RGB data to YCbCr and

 * sample to generate the output data.

 */

static void

cvtStrip(unsigned char* op, uint32* raster, uint32 nrows, uint32 width)

{

	uint32 x;

	int clumpSize = vertSubSampling * horizSubSampling + 2;

	uint32 *tp;

	for (; nrows >= vertSubSampling; nrows -= vertSubSampling) {

		tp = raster;

		for (x = width; x >= horizSubSampling; x -= horizSubSampling) {

			cvtClump(op, tp,

			    vertSubSampling, horizSubSampling, width);

			op += clumpSize;

			tp += horizSubSampling;

		}

		if (x > 0) {

			cvtClump(op, tp, vertSubSampling, x, width);

			op += clumpSize;

		}

		raster -= vertSubSampling*width;

	}

	if (nrows > 0) {

		tp = raster;

		for (x = width; x >= horizSubSampling; x -= horizSubSampling) {

			cvtClump(op, tp, nrows, horizSubSampling, width);

			op += clumpSize;

			tp += horizSubSampling;

		}

		if (x > 0)

			cvtClump(op, tp, nrows, x, width);

	}

}

static int

cvtRaster(TIFF* tif, uint32* raster, uint32 width, uint32 height)

{

	uint32 y;

	tstrip_t strip = 0;

	tsize_t cc, acc;

	unsigned char* buf;

	uint32 rwidth = roundup(width, horizSubSampling);

	uint32 rheight = roundup(height, vertSubSampling);

	uint32 nrows = (rowsperstrip > rheight ? rheight : rowsperstrip);

        uint32 rnrows = roundup(nrows,vertSubSampling);

	cc = rnrows*rwidth +

	    2*((rnrows*rwidth) / (horizSubSampling*vertSubSampling));

	buf = (unsigned char*)_TIFFmalloc(cc);

	for (y = height; (int32) y > 0; y -= nrows) {

		uint32 nr = (y > nrows ? nrows : y);

		cvtStrip(buf, raster + (y-1)*width, nr, width);

		nr = roundup(nr, vertSubSampling);

		acc = nr*rwidth +

			2*((nr*rwidth)/(horizSubSampling*vertSubSampling));

		if (!TIFFWriteEncodedStrip(tif, strip++, buf, acc)) {

			_TIFFfree(buf);

			return (0);

		}

	}

	_TIFFfree(buf);

	return (1);

}

static int

tiffcvt(TIFF* in, TIFF* out)

{

	uint32 width, height;		/* image width & height */

	uint32* raster;			/* retrieve RGBA image */

	uint16 shortv;

	float floatv;

	char *stringv;

	uint32 longv;

	size_t pixel_count;

	TIFFGetField(in, TIFFTAG_IMAGEWIDTH, &width);

	TIFFGetField(in, TIFFTAG_IMAGELENGTH, &height);

	pixel_count = width * height;

	/* XXX: Check the integer overflow. */

	if (!width || !height || pixel_count / width != height) {

		TIFFError(TIFFFileName(in),

			  "Malformed input file; "

			  "can't allocate buffer for raster of %lux%lu size",

			  (unsigned long)width, (unsigned long)height);

		return 0;

	}

	raster = (uint32*)_TIFFCheckMalloc(in, pixel_count, sizeof(uint32),

					   "raster buffer");

	if (raster == 0) {

		TIFFError(TIFFFileName(in),

			  "Requested buffer size is %lu elements %lu each",

			  (unsigned long)pixel_count,

			  (unsigned long)sizeof(uint32));

		return (0);

	}

	if (!TIFFReadRGBAImage(in, width, height, raster, 0)) {

		_TIFFfree(raster);

		return (0);

	}

	CopyField(TIFFTAG_SUBFILETYPE, longv);

	TIFFSetField(out, TIFFTAG_IMAGEWIDTH, width);

	TIFFSetField(out, TIFFTAG_IMAGELENGTH, height);

	TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 8);

	TIFFSetField(out, TIFFTAG_COMPRESSION, compression);

	TIFFSetField(out, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_YCBCR);

	if (compression == COMPRESSION_JPEG)

		TIFFSetField(out, TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RAW);

	CopyField(TIFFTAG_FILLORDER, shortv);

	TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);

	TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, 3);

	CopyField(TIFFTAG_XRESOLUTION, floatv);

	CopyField(TIFFTAG_YRESOLUTION, floatv);

	CopyField(TIFFTAG_RESOLUTIONUNIT, shortv);

	TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);

	{ char buf[2048];

	  char *cp = strrchr(TIFFFileName(in), '/');

	  sprintf(buf, "YCbCr conversion of %s", cp ? cp+1 : TIFFFileName(in));

	  TIFFSetField(out, TIFFTAG_IMAGEDESCRIPTION, buf);

	}

	TIFFSetField(out, TIFFTAG_SOFTWARE, TIFFGetVersion());

	CopyField(TIFFTAG_DOCUMENTNAME, stringv);

	TIFFSetField(out, TIFFTAG_REFERENCEBLACKWHITE, refBlackWhite);

	TIFFSetField(out, TIFFTAG_YCBCRSUBSAMPLING,

	    horizSubSampling, vertSubSampling);

	TIFFSetField(out, TIFFTAG_YCBCRPOSITIONING, YCBCRPOSITION_CENTERED);

	TIFFSetField(out, TIFFTAG_YCBCRCOEFFICIENTS, ycbcrCoeffs);

	rowsperstrip = TIFFDefaultStripSize(out, rowsperstrip);

	TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, rowsperstrip);

	return (cvtRaster(out, raster, width, height));

}

char* stuff[] = {

    "usage: rgb2ycbcr [-c comp] [-r rows] [-h N] [-v N] input... output\n",

    "where comp is one of the following compression algorithms:\n",

    " jpeg\t\tJPEG encoding\n",

    " lzw\t\tLempel-Ziv & Welch encoding\n",

    " zip\t\tdeflate encoding\n",

    " packbits\tPackBits encoding (default)\n",

    " none\t\tno compression\n",

    "and the other options are:\n",

    " -r\trows/strip\n",

    " -h\thorizontal sampling factor (1,2,4)\n",

    " -v\tvertical sampling factor (1,2,4)\n",

    NULL

};

static void

usage(int code)

{

	char buf[BUFSIZ];

	int i;

	setbuf(stderr, buf);

 fprintf(stderr, "%s\n\n", TIFFGetVersion());

	for (i = 0; stuff[i] != NULL; i++)

		fprintf(stderr, "%s\n", stuff[i]);

	exit(code);

}

/* vim: set ts=8 sts=8 sw=8 noet: */

/*

 * Local Variables:

 * mode: c

 * c-basic-offset: 8

 * fill-column: 78

 * End:

 */