/* $Id: rgb2ycbcr.c,v 1.17 2016-08-15 21:26:56 erouault 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
#ifdef NEED_LIBPORT
# include "libport.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;
#if !HAVE_DECL_OPTARG
extern int optind;
extern char *optarg;
#endif
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);
if( horizSubSampling != 1 && horizSubSampling != 2 && horizSubSampling != 4 )
usage(-1);
break;
case 'v':
vertSubSampling = atoi(optarg);
if( vertSubSampling != 1 && vertSubSampling != 2 && vertSubSampling != 4 )
usage(-1);
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);
// FIXME unchecked malloc
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;
int result;
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),
"Failed to allocate buffer (%lu elements of %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), '/');
snprintf(buf, sizeof(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);
result = cvtRaster(out, raster, width, height);
_TIFFfree(raster);
return result;
}
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:
*/