tif_getimage.c

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 */
DECLAREContigPutFunc(put2bitbwtile)
{
    uint32** BWmap = img->BWmap;

    (void) x; (void) y;
    fromskew /= 4;
    while (h-- > 0) {
	uint32* bw;
	UNROLL4(w, bw = BWmap[*pp++], *cp++ = *bw++);
	cp += toskew;
	pp += fromskew;
    }
}

/*
 * 4-bit greyscale => colormap/RGB
 */
DECLAREContigPutFunc(put4bitbwtile)
{
    uint32** BWmap = img->BWmap;

    (void) x; (void) y;
    fromskew /= 2;
    while (h-- > 0) {
	uint32* bw;
	UNROLL2(w, bw = BWmap[*pp++], *cp++ = *bw++);
	cp += toskew;
	pp += fromskew;
    }
}

/*
 * 8-bit packed samples, no Map => RGB
 */
DECLAREContigPutFunc(putRGBcontig8bittile)
{
    int samplesperpixel = img->samplesperpixel;

    (void) x; (void) y;
    fromskew *= samplesperpixel;
    while (h-- > 0) {
	UNROLL8(w, NOP,
	    *cp++ = PACK(pp[0], pp[1], pp[2]);
	    pp += samplesperpixel);
	cp += toskew;
	pp += fromskew;
    }
}

/*
 * 8-bit packed samples, w/ Map => RGB
 */
DECLAREContigPutFunc(putRGBcontig8bitMaptile)
{
    TIFFRGBValue* Map = img->Map;
    int samplesperpixel = img->samplesperpixel;

    (void) y;
    fromskew *= samplesperpixel;
    while (h-- > 0) {
	for (x = w; x-- > 0;) {
	    *cp++ = PACK(Map[pp[0]], Map[pp[1]], Map[pp[2]]);
	    pp += samplesperpixel;
	}
	pp += fromskew;
	cp += toskew;
    }
}

/*
 * 8-bit packed samples => RGBA w/ associated alpha
 * (known to have Map == NULL)
 */
DECLAREContigPutFunc(putRGBAAcontig8bittile)
{
    int samplesperpixel = img->samplesperpixel;

    (void) x; (void) y;
    fromskew *= samplesperpixel;
    while (h-- > 0) {
	UNROLL8(w, NOP,
	    *cp++ = PACK4(pp[0], pp[1], pp[2], pp[3]);
	    pp += samplesperpixel);
	cp += toskew;
	pp += fromskew;
    }
}

/*
 * 8-bit packed samples => RGBA w/ unassociated alpha
 * (known to have Map == NULL)
 */
DECLAREContigPutFunc(putRGBUAcontig8bittile)
{
    int samplesperpixel = img->samplesperpixel;

    (void) y;
    fromskew *= samplesperpixel;
    while (h-- > 0) {
	uint32 r, g, b, a;
	for (x = w; x-- > 0;) {
	    a = pp[3];
	    r = (pp[0] * a) / 255;
	    g = (pp[1] * a) / 255;
	    b = (pp[2] * a) / 255;
	    *cp++ = PACK4(r,g,b,a);
	    pp += samplesperpixel;
	}
	cp += toskew;
	pp += fromskew;
    }
}

/*
 * 16-bit packed samples => RGB
 */
DECLAREContigPutFunc(putRGBcontig16bittile)
{
    int samplesperpixel = img->samplesperpixel;
    uint16 *wp = (uint16 *)pp;

    (void) y;
    fromskew *= samplesperpixel;
    while (h-- > 0) {
	for (x = w; x-- > 0;) {
	    *cp++ = PACKW(wp[0], wp[1], wp[2]);
	    wp += samplesperpixel;
	}
	cp += toskew;
	wp += fromskew;
    }
}

/*
 * 16-bit packed samples => RGBA w/ associated alpha
 * (known to have Map == NULL)
 */
DECLAREContigPutFunc(putRGBAAcontig16bittile)
{
    int samplesperpixel = img->samplesperpixel;
    uint16 *wp = (uint16 *)pp;

    (void) y;
    fromskew *= samplesperpixel;
    while (h-- > 0) {
	for (x = w; x-- > 0;) {
	    *cp++ = PACKW4(wp[0], wp[1], wp[2], wp[3]);
	    wp += samplesperpixel;
	}
	cp += toskew;
	wp += fromskew;
    }
}

/*
 * 16-bit packed samples => RGBA w/ unassociated alpha
 * (known to have Map == NULL)
 */
DECLAREContigPutFunc(putRGBUAcontig16bittile)
{
    int samplesperpixel = img->samplesperpixel;
    uint16 *wp = (uint16 *)pp;

    (void) y;
    fromskew *= samplesperpixel;
    while (h-- > 0) {
	uint32 r,g,b,a;
	/*
	 * We shift alpha down four bits just in case unsigned
	 * arithmetic doesn't handle the full range.
	 * We still have plenty of accuracy, since the output is 8 bits.
	 * So we have (r * 0xffff) * (a * 0xfff)) = r*a * (0xffff*0xfff)
	 * Since we want r*a * 0xff for eight bit output,
	 * we divide by (0xffff * 0xfff) / 0xff == 0x10eff.
	 */
	for (x = w; x-- > 0;) {
	    a = wp[3] >> 4; 
	    r = (wp[0] * a) / 0x10eff;
	    g = (wp[1] * a) / 0x10eff;
	    b = (wp[2] * a) / 0x10eff;
	    *cp++ = PACK4(r,g,b,a);
	    wp += samplesperpixel;
	}
	cp += toskew;
	wp += fromskew;
    }
}

/*
 * 8-bit packed CMYK samples w/o Map => RGB
 *
 * NB: The conversion of CMYK->RGB is *very* crude.
 */
DECLAREContigPutFunc(putRGBcontig8bitCMYKtile)
{
    int samplesperpixel = img->samplesperpixel;
    uint16 r, g, b, k;

    (void) x; (void) y;
    fromskew *= samplesperpixel;
    while (h-- > 0) {
	UNROLL8(w, NOP,
	    k = 255 - pp[3];
	    r = (k*(255-pp[0]))/255;
	    g = (k*(255-pp[1]))/255;
	    b = (k*(255-pp[2]))/255;
	    *cp++ = PACK(r, g, b);
	    pp += samplesperpixel);
	cp += toskew;
	pp += fromskew;
    }
}

/*
 * 8-bit packed CMYK samples w/Map => RGB
 *
 * NB: The conversion of CMYK->RGB is *very* crude.
 */
DECLAREContigPutFunc(putRGBcontig8bitCMYKMaptile)
{
    int samplesperpixel = img->samplesperpixel;
    TIFFRGBValue* Map = img->Map;
    uint16 r, g, b, k;

    (void) y;
    fromskew *= samplesperpixel;
    while (h-- > 0) {
	for (x = w; x-- > 0;) {
	    k = 255 - pp[3];
	    r = (k*(255-pp[0]))/255;
	    g = (k*(255-pp[1]))/255;
	    b = (k*(255-pp[2]))/255;
	    *cp++ = PACK(Map[r], Map[g], Map[b]);
	    pp += samplesperpixel;
	}
	pp += fromskew;
	cp += toskew;
    }
}

#define	DECLARESepPutFunc(name) \
static void name(\
    TIFFRGBAImage* img,\
    uint32* cp,\
    uint32 x, uint32 y, \
    uint32 w, uint32 h,\
    int32 fromskew, int32 toskew,\
    u_char* r, u_char* g, u_char* b, u_char* a\
)

/*
 * 8-bit unpacked samples => RGB
 */
DECLARESepPutFunc(putRGBseparate8bittile)
{
    (void) img; (void) x; (void) y; (void) a;
    while (h-- > 0) {
	UNROLL8(w, NOP, *cp++ = PACK(*r++, *g++, *b++));
	SKEW(r, g, b, fromskew);
	cp += toskew;
    }
}

/*
 * 8-bit unpacked samples => RGB
 */
DECLARESepPutFunc(putRGBseparate8bitMaptile)
{
    TIFFRGBValue* Map = img->Map;

    (void) y; (void) a;
    while (h-- > 0) {
	for (x = w; x > 0; x--)
	    *cp++ = PACK(Map[*r++], Map[*g++], Map[*b++]);
	SKEW(r, g, b, fromskew);
	cp += toskew;
    }
}

/*
 * 8-bit unpacked samples => RGBA w/ associated alpha
 */
DECLARESepPutFunc(putRGBAAseparate8bittile)
{
    (void) img; (void) x; (void) y;
    while (h-- > 0) {
	UNROLL8(w, NOP, *cp++ = PACK4(*r++, *g++, *b++, *a++));
	SKEW4(r, g, b, a, fromskew);
	cp += toskew;
    }
}

/*
 * 8-bit unpacked samples => RGBA w/ unassociated alpha
 */
DECLARESepPutFunc(putRGBUAseparate8bittile)
{
    (void) img; (void) y;
    while (h-- > 0) {
	uint32 rv, gv, bv, av;
	for (x = w; x-- > 0;) {
	    av = *a++;
	    rv = (*r++ * av) / 255;
	    gv = (*g++ * av) / 255;
	    bv = (*b++ * av) / 255;
	    *cp++ = PACK4(rv,gv,bv,av);
	}
	SKEW4(r, g, b, a, fromskew);
	cp += toskew;
    }
}

/*
 * 16-bit unpacked samples => RGB
 */
DECLARESepPutFunc(putRGBseparate16bittile)
{
    uint16 *wr = (uint16*) r;
    uint16 *wg = (uint16*) g;
    uint16 *wb = (uint16*) b;

    (void) img; (void) y; (void) a;
    while (h-- > 0) {
	for (x = 0; x < w; x++)
	    *cp++ = PACKW(*wr++, *wg++, *wb++);
	SKEW(wr, wg, wb, fromskew);
	cp += toskew;
    }
}

/*
 * 16-bit unpacked samples => RGBA w/ associated alpha
 */
DECLARESepPutFunc(putRGBAAseparate16bittile)
{
    uint16 *wr = (uint16*) r;
    uint16 *wg = (uint16*) g;
    uint16 *wb = (uint16*) b;
    uint16 *wa = (uint16*) a;

    (void) img; (void) y;
    while (h-- > 0) {
	for (x = 0; x < w; x++)
	    *cp++ = PACKW4(*wr++, *wg++, *wb++, *wa++);
	SKEW4(wr, wg, wb, wa, fromskew);
	cp += toskew;
    }
}

/*
 * 16-bit unpacked samples => RGBA w/ unassociated alpha
 */
DECLARESepPutFunc(putRGBUAseparate16bittile)
{
    uint16 *wr = (uint16*) r;
    uint16 *wg = (uint16*) g;
    uint16 *wb = (uint16*) b;
    uint16 *wa = (uint16*) a;

    (void) img; (void) y;
    while (h-- > 0) {
	uint32 r,g,b,a;
	/*
	 * We shift alpha down four bits just in case unsigned
	 * arithmetic doesn't handle the full range.
	 * We still have plenty of accuracy, since the output is 8 bits.
	 * So we have (r * 0xffff) * (a * 0xfff)) = r*a * (0xffff*0xfff)
	 * Since we want r*a * 0xff for eight bit output,
	 * we divide by (0xffff * 0xfff) / 0xff == 0x10eff.
	 */
	for (x = w; x-- > 0;) {
	    a = *wa++ >> 4; 
	    r = (*wr++ * a) / 0x10eff;
	    g = (*wg++ * a) / 0x10eff;
	    b = (*wb++ * a) / 0x10eff;
	    *cp++ = PACK4(r,g,b,a);
	}
	SKEW4(wr, wg, wb, wa, fromskew);
	cp += toskew;
    }
}

/*
 * YCbCr -> RGB conversion and packing routines.  The colorspace
 * conversion algorithm comes from the IJG v5a code; see below
 * for more information on how it works.
 */

#define	YCbCrtoRGB(dst, yc) {						\
    int Y = (yc);							\
    dst = PACK(								\
	clamptab[Y+Crrtab[Cr]],						\
	clamptab[Y + (int)((Cbgtab[Cb]+Crgtab[Cr])>>16)],		\
	clamptab[Y+Cbbtab[Cb]]);					\
}
#define	YCbCrSetup							\
    TIFFYCbCrToRGB* ycbcr = img->ycbcr;					\
    int* Crrtab = ycbcr->Cr_r_tab;					\
    int* Cbbtab = ycbcr->Cb_b_tab;					\
    int32* Crgtab = ycbcr->Cr_g_tab;					\
    int32* Cbgtab = ycbcr->Cb_g_tab;					\
    TIFFRGBValue* clamptab = ycbcr->clamptab

/*
 * 8-bit packed YCbCr samples => RGB 
 * This function is generic for different sampling sizes, 
 * and can handle blocks sizes that aren't multiples of the
 * sampling size.  However, it is substantially less optimized
 * than the specific sampling cases.  It is used as a fallback
 * for difficult blocks.
 */
#ifdef notdef
static void putcontig8bitYCbCrGenericTile( 
    TIFFRGBAImage* img, 
    uint32* cp, 
    uint32 x, uint32 y, 
    uint32 w, uint32 h, 
    int32 fromskew, int32 toskew, 
    u_char* pp,
    int h_group, 
    int v_group )

{
    YCbCrSetup;
    
    uint32* cp1 = cp+w+toskew;
    uint32* cp2 = cp1+w+toskew;
    uint32* cp3 = cp2+w+toskew;
    int32 incr = 3*w+4*toskew;
    int     Cb, Cr;
    int     group_size = v_group * h_group + 2;

    (void) y;
    fromskew = (fromskew * group_size) / h_group;

    for( yy = 0; yy < h; yy++ )
    {
        u_char *pp_line;
        int     y_line_group = yy / v_group;
        int     y_remainder = yy - y_line_group * v_group;

        pp_line = pp + v_line_group * 

        
        for( xx = 0; xx < w; xx++ )
        {
            Cb = pp
        }
    }
    for (; h >= 4; h -= 4) {
	x = w>>2;
	do {
	    Cb = pp[16];
	    Cr = pp[17];

	    YCbCrtoRGB(cp [0], pp[ 0]);
	    YCbCrtoRGB(cp [1], pp[ 1]);
	    YCbCrtoRGB(cp [2], pp[ 2]);
	    YCbCrtoRGB(cp [3], pp[ 3]);
	    YCbCrtoRGB(cp1[0], pp[ 4]);
	    YCbCrtoRGB(cp1[1], pp[ 5]);
	    YCbCrtoRGB(cp1[2], pp[ 6]);
	    YCbCrtoRGB(cp1[3], pp[ 7]);
	    YCbCrtoRGB(cp2[0], pp[ 8]);
	    YCbCrtoRGB(cp2[1], pp[ 9]);
	    YCbCrtoRGB(cp2[2], pp[10]);
	    YCbCrtoRGB(cp2[3], pp[11]);
	    YCbCrtoRGB(cp3[0], pp[12]);
	    YCbCrtoRGB(cp3[1], pp[13]);
	    YCbCrtoRGB(cp3[2], pp[14]);
	    YCbCrtoRGB(cp3[3], pp[15]);

	    cp += 4, cp1 += 4, cp2 += 4, cp3 += 4;
	    pp += 18;
	} while (--x);
	cp += incr, cp1 += incr, cp2 += incr, cp3 += incr;
	pp += fromskew;
    }
}
#endif

/*
 * 8-bit packed YCbCr samples w/ 4,4 subsampling => RGB
 */