third_party/libtiff/tif_color.c - pdfium - Git at Google

 /* $Id: tif_color.c,v 1.19 2010-12-14 02:22:42 faxguy Exp $ */

 /*
  * Copyright (c) 1988-1997 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.
  */

 /*
  * CIE L*a*b* to CIE XYZ and CIE XYZ to RGB conversion routines are taken
  * from the VIPS library (http://www.vips.ecs.soton.ac.uk) with
  * the permission of John Cupitt, the VIPS author.
  */

 /*
  * TIFF Library.
  *
  * Color space conversion routines.
  */

 #include "tiffiop.h"
 #include <math.h>

 /*
  * Convert color value from the CIE L*a*b* 1976 space to CIE XYZ.
  */
 void
 TIFFCIELabToXYZ(TIFFCIELabToRGB *cielab, uint32 l, int32 a, int32 b,
 		float *X, float *Y, float *Z)
 {
 	float L = (float)l * 100.0F / 255.0F;
 	float cby, tmp;

 	if( L < 8.856F ) {
 		*Y = (L * cielab->Y0) / 903.292F;
 		cby = 7.787F * (*Y / cielab->Y0) + 16.0F / 116.0F;
 	} else {
 		cby = (L + 16.0F) / 116.0F;
 		*Y = cielab->Y0 * cby * cby * cby;
 	}

 	tmp = (float)a / 500.0F + cby;
 	if( tmp < 0.2069F )
 		*X = cielab->X0 * (tmp - 0.13793F) / 7.787F;
 	else
 		*X = cielab->X0 * tmp * tmp * tmp;

 	tmp = cby - (float)b / 200.0F;
 	if( tmp < 0.2069F )
 		*Z = cielab->Z0 * (tmp - 0.13793F) / 7.787F;
 	else
 		*Z = cielab->Z0 * tmp * tmp * tmp;
 }

 #define RINT(R) ((uint32)((R)>0?((R)+0.5):((R)-0.5)))
 /*
  * Convert color value from the XYZ space to RGB.
  */
 void
 TIFFXYZToRGB(TIFFCIELabToRGB *cielab, float X, float Y, float Z,
 	     uint32 *r, uint32 *g, uint32 *b)
 {
 	int i;
 	float Yr, Yg, Yb;
 	float *matrix = &cielab->display.d_mat[0][0];

 	/* Multiply through the matrix to get luminosity values. */
 	Yr =  matrix[0] * X + matrix[1] * Y + matrix[2] * Z;
 	Yg =  matrix[3] * X + matrix[4] * Y + matrix[5] * Z;
 	Yb =  matrix[6] * X + matrix[7] * Y + matrix[8] * Z;

 	/* Clip input */
 	Yr = TIFFmax(Yr, cielab->display.d_Y0R);
 	Yg = TIFFmax(Yg, cielab->display.d_Y0G);
 	Yb = TIFFmax(Yb, cielab->display.d_Y0B);

 	/* Avoid overflow in case of wrong input values */
 	Yr = TIFFmin(Yr, cielab->display.d_YCR);
 	Yg = TIFFmin(Yg, cielab->display.d_YCG);
 	Yb = TIFFmin(Yb, cielab->display.d_YCB);

 	/* Turn luminosity to colour value. */
 	i = (int)((Yr - cielab->display.d_Y0R) / cielab->rstep);
 	i = TIFFmin(cielab->range, i);
 	*r = RINT(cielab->Yr2r[i]);

 	i = (int)((Yg - cielab->display.d_Y0G) / cielab->gstep);
 	i = TIFFmin(cielab->range, i);
 	*g = RINT(cielab->Yg2g[i]);

 	i = (int)((Yb - cielab->display.d_Y0B) / cielab->bstep);
 	i = TIFFmin(cielab->range, i);
 	*b = RINT(cielab->Yb2b[i]);

 	/* Clip output. */
 	*r = TIFFmin(*r, cielab->display.d_Vrwr);
 	*g = TIFFmin(*g, cielab->display.d_Vrwg);
 	*b = TIFFmin(*b, cielab->display.d_Vrwb);
 }
 #undef RINT

 /*
  * Allocate conversion state structures and make look_up tables for
  * the Yr,Yb,Yg <=> r,g,b conversions.
  */
 int
 TIFFCIELabToRGBInit(TIFFCIELabToRGB* cielab,
 		    const TIFFDisplay *display, float *refWhite)
 {
 	int i;
 	double gamma;

 	cielab->range = CIELABTORGB_TABLE_RANGE;

 	_TIFFmemcpy(&cielab->display, display, sizeof(TIFFDisplay));

 	/* Red */
 	gamma = 1.0 / cielab->display.d_gammaR ;
 	cielab->rstep =
 		(cielab->display.d_YCR - cielab->display.d_Y0R)	/ cielab->range;
 	for(i = 0; i <= cielab->range; i++) {
 		cielab->Yr2r[i] = cielab->display.d_Vrwr
 		    * ((float)pow((double)i / cielab->range, gamma));
 	}

 	/* Green */
 	gamma = 1.0 / cielab->display.d_gammaG ;
 	cielab->gstep =
 	    (cielab->display.d_YCR - cielab->display.d_Y0R) / cielab->range;
 	for(i = 0; i <= cielab->range; i++) {
 		cielab->Yg2g[i] = cielab->display.d_Vrwg
 		    * ((float)pow((double)i / cielab->range, gamma));
 	}

 	/* Blue */
 	gamma = 1.0 / cielab->display.d_gammaB ;
 	cielab->bstep =
 	    (cielab->display.d_YCR - cielab->display.d_Y0R) / cielab->range;
 	for(i = 0; i <= cielab->range; i++) {
 		cielab->Yb2b[i] = cielab->display.d_Vrwb
 		    * ((float)pow((double)i / cielab->range, gamma));
 	}

 	/* Init reference white point */
 	cielab->X0 = refWhite[0];
 	cielab->Y0 = refWhite[1];
 	cielab->Z0 = refWhite[2];

 	return 0;
 }

 /*
  * Convert color value from the YCbCr space to CIE XYZ.
  * The colorspace conversion algorithm comes from the IJG v5a code;
  * see below for more information on how it works.
  */
 #define	SHIFT			16
 #define	FIX(x)			((int32)((x) * (1L<<SHIFT) + 0.5))
 #define	ONE_HALF		((int32)(1<<(SHIFT-1)))
 #define	Code2V(c, RB, RW, CR)	((((c)-(int32)(RB))*(float)(CR))/(float)(((RW)-(RB)) ? ((RW)-(RB)) : 1))
 #define	CLAMP(f,min,max)	((f)<(min)?(min):(f)>(max)?(max):(f))
 #define HICLAMP(f,max)		((f)>(max)?(max):(f))

 void
 TIFFYCbCrtoRGB(TIFFYCbCrToRGB *ycbcr, uint32 Y, int32 Cb, int32 Cr,
 	       uint32 *r, uint32 *g, uint32 *b)
 {
 	int32 i;

 	/* XXX: Only 8-bit YCbCr input supported for now */
 	Y = HICLAMP(Y, 255), Cb = CLAMP(Cb, 0, 255), Cr = CLAMP(Cr, 0, 255);

 	i = ycbcr->Y_tab[Y] + ycbcr->Cr_r_tab[Cr];
 	*r = CLAMP(i, 0, 255);
 	i = ycbcr->Y_tab[Y]
 	    + (int)((ycbcr->Cb_g_tab[Cb] + ycbcr->Cr_g_tab[Cr]) >> SHIFT);
 	*g = CLAMP(i, 0, 255);
 	i = ycbcr->Y_tab[Y] + ycbcr->Cb_b_tab[Cb];
 	*b = CLAMP(i, 0, 255);
 }

 /*
  * Initialize the YCbCr->RGB conversion tables.  The conversion
  * is done according to the 6.0 spec:
  *
  *    R = Y + Cr*(2 - 2*LumaRed)
  *    B = Y + Cb*(2 - 2*LumaBlue)
  *    G =   Y
  *        - LumaBlue*Cb*(2-2*LumaBlue)/LumaGreen
  *        - LumaRed*Cr*(2-2*LumaRed)/LumaGreen
  *
  * To avoid floating point arithmetic the fractional constants that
  * come out of the equations are represented as fixed point values
  * in the range 0...2^16.  We also eliminate multiplications by
  * pre-calculating possible values indexed by Cb and Cr (this code
  * assumes conversion is being done for 8-bit samples).
  */
 int
 TIFFYCbCrToRGBInit(TIFFYCbCrToRGB* ycbcr, float *luma, float *refBlackWhite)
 {
     TIFFRGBValue* clamptab;
     int i;

 #define LumaRed	    luma[0]
 #define LumaGreen   luma[1]
 #define LumaBlue    luma[2]

     clamptab = (TIFFRGBValue*)(
 	(uint8*) ycbcr+TIFFroundup_32(sizeof (TIFFYCbCrToRGB), sizeof (long)));
     _TIFFmemset(clamptab, 0, 256);		/* v < 0 => 0 */
     ycbcr->clamptab = (clamptab += 256);
     for (i = 0; i < 256; i++)
 	clamptab[i] = (TIFFRGBValue) i;
     _TIFFmemset(clamptab+256, 255, 2*256);	/* v > 255 => 255 */
     ycbcr->Cr_r_tab = (int*) (clamptab + 3*256);
     ycbcr->Cb_b_tab = ycbcr->Cr_r_tab + 256;
     ycbcr->Cr_g_tab = (int32*) (ycbcr->Cb_b_tab + 256);
     ycbcr->Cb_g_tab = ycbcr->Cr_g_tab + 256;
     ycbcr->Y_tab = ycbcr->Cb_g_tab + 256;

     { float f1 = 2-2*LumaRed;		int32 D1 = FIX(f1);
       float f2 = LumaRed*f1/LumaGreen;	int32 D2 = -FIX(f2);
       float f3 = 2-2*LumaBlue;		int32 D3 = FIX(f3);
       float f4 = LumaBlue*f3/LumaGreen;	int32 D4 = -FIX(f4);
       int x;

 #undef LumaBlue
 #undef LumaGreen
 #undef LumaRed

       /*
        * i is the actual input pixel value in the range 0..255
        * Cb and Cr values are in the range -128..127 (actually
        * they are in a range defined by the ReferenceBlackWhite
        * tag) so there is some range shifting to do here when
        * constructing tables indexed by the raw pixel data.
        */
       for (i = 0, x = -128; i < 256; i++, x++) {
 	    int32 Cr = (int32)Code2V(x, refBlackWhite[4] - 128.0F,
 			    refBlackWhite[5] - 128.0F, 127);
 	    int32 Cb = (int32)Code2V(x, refBlackWhite[2] - 128.0F,
 			    refBlackWhite[3] - 128.0F, 127);

 	    ycbcr->Cr_r_tab[i] = (int32)((D1*Cr + ONE_HALF)>>SHIFT);
 	    ycbcr->Cb_b_tab[i] = (int32)((D3*Cb + ONE_HALF)>>SHIFT);
 	    ycbcr->Cr_g_tab[i] = D2*Cr;
 	    ycbcr->Cb_g_tab[i] = D4*Cb + ONE_HALF;
 	    ycbcr->Y_tab[i] =
 		    (int32)Code2V(x + 128, refBlackWhite[0], refBlackWhite[1], 255);
       }
     }

     return 0;
 }
 #undef	HICLAMP
 #undef	CLAMP
 #undef	Code2V
 #undef	SHIFT
 #undef	ONE_HALF
 #undef	FIX

 /* vim: set ts=8 sts=8 sw=8 noet: */
 /*
  * Local Variables:
  * mode: c
  * c-basic-offset: 8
  * fill-column: 78
  * End:
  */
	/* $Id: tif_color.c,v 1.19 2010-12-14 02:22:42 faxguy Exp $ */

	/*
	* Copyright (c) 1988-1997 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.
	*/

	/*
	* CIE Lab* to CIE XYZ and CIE XYZ to RGB conversion routines are taken
	* from the VIPS library (http://www.vips.ecs.soton.ac.uk) with
	* the permission of John Cupitt, the VIPS author.
	*/

	/*
	* TIFF Library.
	*
	* Color space conversion routines.
	*/

	#include "tiffiop.h"
	#include <math.h>

	/*
	* Convert color value from the CIE Lab* 1976 space to CIE XYZ.
	*/
	void
	TIFFCIELabToXYZ(TIFFCIELabToRGB *cielab, uint32 l, int32 a, int32 b,
	float X, float Y, float *Z)
	{
	float L = (float)l * 100.0F / 255.0F;
	float cby, tmp;

	if( L < 8.856F ) {
	Y = (L cielab->Y0) / 903.292F;
	cby = 7.787F * (*Y / cielab->Y0) + 16.0F / 116.0F;
	} else {
	cby = (L + 16.0F) / 116.0F;
	Y = cielab->Y0 cby * cby * cby;
	}

	tmp = (float)a / 500.0F + cby;
	if( tmp < 0.2069F )
	X = cielab->X0 (tmp - 0.13793F) / 7.787F;
	else
	X = cielab->X0 tmp * tmp * tmp;

	tmp = cby - (float)b / 200.0F;
	if( tmp < 0.2069F )
	Z = cielab->Z0 (tmp - 0.13793F) / 7.787F;
	else
	Z = cielab->Z0 tmp * tmp * tmp;
	}

	#define RINT(R) ((uint32)((R)>0?((R)+0.5):((R)-0.5)))
	/*
	* Convert color value from the XYZ space to RGB.
	*/
	void
	TIFFXYZToRGB(TIFFCIELabToRGB *cielab, float X, float Y, float Z,
	uint32 r, uint32 g, uint32 *b)
	{
	int i;
	float Yr, Yg, Yb;
	float *matrix = &cielab->display.d_mat[0][0];

	/* Multiply through the matrix to get luminosity values. */
	Yr = matrix[0] * X + matrix[1] * Y + matrix[2] * Z;
	Yg = matrix[3] * X + matrix[4] * Y + matrix[5] * Z;
	Yb = matrix[6] * X + matrix[7] * Y + matrix[8] * Z;

	/* Clip input */
	Yr = TIFFmax(Yr, cielab->display.d_Y0R);
	Yg = TIFFmax(Yg, cielab->display.d_Y0G);
	Yb = TIFFmax(Yb, cielab->display.d_Y0B);

	/* Avoid overflow in case of wrong input values */
	Yr = TIFFmin(Yr, cielab->display.d_YCR);
	Yg = TIFFmin(Yg, cielab->display.d_YCG);
	Yb = TIFFmin(Yb, cielab->display.d_YCB);

	/* Turn luminosity to colour value. */
	i = (int)((Yr - cielab->display.d_Y0R) / cielab->rstep);
	i = TIFFmin(cielab->range, i);
	*r = RINT(cielab->Yr2r[i]);

	i = (int)((Yg - cielab->display.d_Y0G) / cielab->gstep);
	i = TIFFmin(cielab->range, i);
	*g = RINT(cielab->Yg2g[i]);

	i = (int)((Yb - cielab->display.d_Y0B) / cielab->bstep);
	i = TIFFmin(cielab->range, i);
	*b = RINT(cielab->Yb2b[i]);

	/* Clip output. */
	r = TIFFmin(r, cielab->display.d_Vrwr);
	g = TIFFmin(g, cielab->display.d_Vrwg);
	b = TIFFmin(b, cielab->display.d_Vrwb);
	}
	#undef RINT

	/*
	* Allocate conversion state structures and make look_up tables for
	* the Yr,Yb,Yg <=> r,g,b conversions.
	*/
	int
	TIFFCIELabToRGBInit(TIFFCIELabToRGB* cielab,
	const TIFFDisplay display, float refWhite)
	{
	int i;
	double gamma;

	cielab->range = CIELABTORGB_TABLE_RANGE;

	_TIFFmemcpy(&cielab->display, display, sizeof(TIFFDisplay));

	/* Red */
	gamma = 1.0 / cielab->display.d_gammaR ;
	cielab->rstep =
	(cielab->display.d_YCR - cielab->display.d_Y0R) / cielab->range;
	for(i = 0; i <= cielab->range; i++) {
	cielab->Yr2r[i] = cielab->display.d_Vrwr
	* ((float)pow((double)i / cielab->range, gamma));
	}

	/* Green */
	gamma = 1.0 / cielab->display.d_gammaG ;
	cielab->gstep =
	(cielab->display.d_YCR - cielab->display.d_Y0R) / cielab->range;
	for(i = 0; i <= cielab->range; i++) {
	cielab->Yg2g[i] = cielab->display.d_Vrwg
	* ((float)pow((double)i / cielab->range, gamma));
	}

	/* Blue */
	gamma = 1.0 / cielab->display.d_gammaB ;
	cielab->bstep =
	(cielab->display.d_YCR - cielab->display.d_Y0R) / cielab->range;
	for(i = 0; i <= cielab->range; i++) {
	cielab->Yb2b[i] = cielab->display.d_Vrwb
	* ((float)pow((double)i / cielab->range, gamma));
	}

	/* Init reference white point */
	cielab->X0 = refWhite[0];
	cielab->Y0 = refWhite[1];
	cielab->Z0 = refWhite[2];

	return 0;
	}

	/*
	* Convert color value from the YCbCr space to CIE XYZ.
	* The colorspace conversion algorithm comes from the IJG v5a code;
	* see below for more information on how it works.
	*/
	#define SHIFT 16
	#define FIX(x) ((int32)((x) * (1L<<SHIFT) + 0.5))
	#define ONE_HALF ((int32)(1<<(SHIFT-1)))
	#define Code2V(c, RB, RW, CR) ((((c)-(int32)(RB))*(float)(CR))/(float)(((RW)-(RB)) ? ((RW)-(RB)) : 1))
	#define CLAMP(f,min,max) ((f)<(min)?(min):(f)>(max)?(max):(f))
	#define HICLAMP(f,max) ((f)>(max)?(max):(f))

	void
	TIFFYCbCrtoRGB(TIFFYCbCrToRGB *ycbcr, uint32 Y, int32 Cb, int32 Cr,
	uint32 r, uint32 g, uint32 *b)
	{
	int32 i;

	/* XXX: Only 8-bit YCbCr input supported for now */
	Y = HICLAMP(Y, 255), Cb = CLAMP(Cb, 0, 255), Cr = CLAMP(Cr, 0, 255);

	i = ycbcr->Y_tab[Y] + ycbcr->Cr_r_tab[Cr];
	*r = CLAMP(i, 0, 255);
	i = ycbcr->Y_tab[Y]
	+ (int)((ycbcr->Cb_g_tab[Cb] + ycbcr->Cr_g_tab[Cr]) >> SHIFT);
	*g = CLAMP(i, 0, 255);
	i = ycbcr->Y_tab[Y] + ycbcr->Cb_b_tab[Cb];
	*b = CLAMP(i, 0, 255);
	}

	/*
	* Initialize the YCbCr->RGB conversion tables. The conversion
	* is done according to the 6.0 spec:
	*
	* R = Y + Cr(2 - 2LumaRed)
	* B = Y + Cb(2 - 2LumaBlue)
	* G = Y
	* - LumaBlueCb(2-2*LumaBlue)/LumaGreen
	* - LumaRedCr(2-2*LumaRed)/LumaGreen
	*
	* To avoid floating point arithmetic the fractional constants that
	* come out of the equations are represented as fixed point values
	* in the range 0...2^16. We also eliminate multiplications by
	* pre-calculating possible values indexed by Cb and Cr (this code
	* assumes conversion is being done for 8-bit samples).
	*/
	int
	TIFFYCbCrToRGBInit(TIFFYCbCrToRGB* ycbcr, float luma, float refBlackWhite)
	{
	TIFFRGBValue* clamptab;
	int i;

	#define LumaRed luma[0]
	#define LumaGreen luma[1]
	#define LumaBlue luma[2]

	clamptab = (TIFFRGBValue*)(
	(uint8*) ycbcr+TIFFroundup_32(sizeof (TIFFYCbCrToRGB), sizeof (long)));
	_TIFFmemset(clamptab, 0, 256); /* v < 0 => 0 */
	ycbcr->clamptab = (clamptab += 256);
	for (i = 0; i < 256; i++)
	clamptab[i] = (TIFFRGBValue) i;
	_TIFFmemset(clamptab+256, 255, 2256); / v > 255 => 255 */
	ycbcr->Cr_r_tab = (int) (clamptab + 3256);
	ycbcr->Cb_b_tab = ycbcr->Cr_r_tab + 256;
	ycbcr->Cr_g_tab = (int32*) (ycbcr->Cb_b_tab + 256);
	ycbcr->Cb_g_tab = ycbcr->Cr_g_tab + 256;
	ycbcr->Y_tab = ycbcr->Cb_g_tab + 256;

	{ float f1 = 2-2*LumaRed; int32 D1 = FIX(f1);
	float f2 = LumaRed*f1/LumaGreen; int32 D2 = -FIX(f2);
	float f3 = 2-2*LumaBlue; int32 D3 = FIX(f3);
	float f4 = LumaBlue*f3/LumaGreen; int32 D4 = -FIX(f4);
	int x;

	#undef LumaBlue
	#undef LumaGreen
	#undef LumaRed

	/*
	* i is the actual input pixel value in the range 0..255
	* Cb and Cr values are in the range -128..127 (actually
	* they are in a range defined by the ReferenceBlackWhite
	* tag) so there is some range shifting to do here when
	* constructing tables indexed by the raw pixel data.
	*/
	for (i = 0, x = -128; i < 256; i++, x++) {
	int32 Cr = (int32)Code2V(x, refBlackWhite[4] - 128.0F,
	refBlackWhite[5] - 128.0F, 127);
	int32 Cb = (int32)Code2V(x, refBlackWhite[2] - 128.0F,
	refBlackWhite[3] - 128.0F, 127);

	ycbcr->Cr_r_tab[i] = (int32)((D1*Cr + ONE_HALF)>>SHIFT);
	ycbcr->Cb_b_tab[i] = (int32)((D3*Cb + ONE_HALF)>>SHIFT);
	ycbcr->Cr_g_tab[i] = D2*Cr;
	ycbcr->Cb_g_tab[i] = D4*Cb + ONE_HALF;
	ycbcr->Y_tab[i] =
	(int32)Code2V(x + 128, refBlackWhite[0], refBlackWhite[1], 255);
	}
	}

	return 0;
	}
	#undef HICLAMP
	#undef CLAMP
	#undef Code2V
	#undef SHIFT
	#undef ONE_HALF
	#undef FIX

	/* vim: set ts=8 sts=8 sw=8 noet: */
	/*
	* Local Variables:
	* mode: c
	* c-basic-offset: 8
	* fill-column: 78
	* End:
	*/