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decode-jpg.c

/* 
 *    linux/drivers/video/bootsplash/decode-jpg.c - a tiny jpeg decoder.
 *      
 *      (w) August 2001 by Michael Schroeder, <mls@suse.de>
 *                  
 */

#include "boot.h"

#include "decode-jpg.h"

#define ISHIFT 11

#define IFIX(a) ((int)((a) * (1 << ISHIFT) + .5))
#define IMULT(a, b) (((a) * (b)) >> ISHIFT)
#define ITOINT(a) ((a) >> ISHIFT)

#ifndef __P
# define __P(x) x
#endif

/* special markers */
#define M_BADHUFF -1
#define M_EOF           0x80

struct in {
      unsigned char *p;
      unsigned int bits;
      int left;
      int marker;

      int (*func) __P((void *));
      void *data;
};

/*********************************/
struct dec_hufftbl;
struct enc_hufftbl;

union hufftblp {
      struct dec_hufftbl *dhuff;
      struct enc_hufftbl *ehuff;
};

struct scan {
      int dc;                 /* old dc value */

      union hufftblp hudc;
      union hufftblp huac;
      int next;         /* when to switch to next scan */

      int cid;          /* component id */
      int hv;                 /* horiz/vert, copied from comp */
      int tq;                 /* quant tbl, copied from comp */
};

/*********************************/

#define DECBITS 10            /* seems to be the optimum */

struct dec_hufftbl {
      int maxcode[17];
      int valptr[16];
      unsigned char vals[256];
      unsigned int llvals[1 << DECBITS];
};

static void decode_mcus __P((struct in *, int *, int, struct scan *, int *));
static int dec_readmarker __P((struct in *));
static void dec_makehuff __P((struct dec_hufftbl *, int *, unsigned char *));

static void setinput __P((struct in *, unsigned char *));
/*********************************/

#undef PREC
#define PREC int

static void idctqtab __P((unsigned char *, PREC *));
static void idct __P((int *, int *, PREC *, PREC, int));
static void scaleidctqtab __P((PREC *, PREC));

/*********************************/

static void initcol __P((PREC[][64]));

static void col221111 __P((int *, unsigned char *, int));
static void col221111_16 __P((int *, unsigned char *, int));

/*********************************/

#define M_SOI     0xd8
#define M_APP0    0xe0
#define M_DQT     0xdb
#define M_SOF0    0xc0
#define M_DHT   0xc4
#define M_DRI     0xdd
#define M_SOS     0xda
#define M_RST0    0xd0
#define M_EOI     0xd9
#define M_COM     0xfe

static unsigned char *datap;

static int getbyte(void)
{
      return *datap++;
}

static int getword(void)
{
      int c1, c2;
      c1 = *datap++;
      c2 = *datap++;
      return c1 << 8 | c2;
}

struct comp {
      int cid;
      int hv;
      int tq;
};

#define MAXCOMP 4
struct jpginfo {
      int nc;                 /* number of components */
      int ns;                 /* number of scans */
      int dri;          /* restart interval */
      int nm;                 /* mcus til next marker */
      int rm;                 /* next restart marker */
};

static struct jpginfo info;
static struct comp comps[MAXCOMP];

static struct scan dscans[MAXCOMP];

static unsigned char quant[4][64];

static struct dec_hufftbl dhuff[4];

#define dec_huffdc (dhuff + 0)
#define dec_huffac (dhuff + 2)

static struct in in;

static int readtables(int till)
{
      int m, l, i, j, lq, pq, tq;
      int tc, th, tt;

      for (;;) {
            if (getbyte() != 0xff)
                  return -1;
            if ((m = getbyte()) == till)
                  break;

            switch (m) {
            case 0xc2:
                  return 0;

            case M_DQT:
                  lq = getword();
                  while (lq > 2) {
                        pq = getbyte();
                        tq = pq & 15;
                        if (tq > 3)
                              return -1;
                        pq >>= 4;
                        if (pq != 0)
                              return -1;
                        for (i = 0; i < 64; i++)
                              quant[tq][i] = getbyte();
                        lq -= 64 + 1;
                  }
                  break;

            case M_DHT:
                  l = getword();
                  while (l > 2) {
                        int hufflen[16], k;
                        unsigned char huffvals[256];

                        tc = getbyte();
                        th = tc & 15;
                        tc >>= 4;
                        tt = tc * 2 + th;
                        if (tc > 1 || th > 1)
                              return -1;
                        for (i = 0; i < 16; i++)
                              hufflen[i] = getbyte();
                        l -= 1 + 16;
                        k = 0;
                        for (i = 0; i < 16; i++) {
                              for (j = 0; j < hufflen[i]; j++)
                                    huffvals[k++] = getbyte();
                              l -= hufflen[i];
                        }
                        dec_makehuff(dhuff + tt, hufflen,
                                   huffvals);
                  }
                  break;

            case M_DRI:
                  l = getword();
                  info.dri = getword();
                  break;

            default:
                  l = getword();
                  while (l-- > 2)
                        getbyte();
                  break;
            }
      }
      return 0;
}

static void dec_initscans(void)
{
      int i;

      info.nm = info.dri + 1;
      info.rm = M_RST0;
      for (i = 0; i < info.ns; i++)
            dscans[i].dc = 0;
}

static int dec_checkmarker(void)
{
      int i;

      if (dec_readmarker(&in) != info.rm)
            return -1;
      info.nm = info.dri;
      info.rm = (info.rm + 1) & ~0x08;
      for (i = 0; i < info.ns; i++)
            dscans[i].dc = 0;
      return 0;
}

int jpeg_get_size(unsigned char *buf, int *width, int *height, int *depth)
{
      datap = buf;
      getbyte(); 
      getbyte(); 
      readtables(M_SOF0);
      getword();
      getbyte();
        *height = getword();
      *width = getword();
      *depth = getbyte() << 3;
      return 0;
}

int jpeg_decode(buf, pic, width, height, depth, decdata)
unsigned char *buf, *pic;
int width, height, depth;
struct jpeg_decdata *decdata;
{
      int i, j, m, tac, tdc;
      int mcusx, mcusy, mx, my;
      int max[6];

      if (!decdata)
            return -1;
      datap = buf;
      if (getbyte() != 0xff)
            return ERR_NO_SOI;
      if (getbyte() != M_SOI)
            return ERR_NO_SOI;
      if (readtables(M_SOF0))
            return ERR_BAD_TABLES;
      getword();
      i = getbyte();
      if (i != 8)
            return ERR_NOT_8BIT;
      if (((getword() + 15) & ~15) != height)
            return ERR_HEIGHT_MISMATCH;
      if (((getword() + 15) & ~15) != width)
            return ERR_WIDTH_MISMATCH;
      if ((height & 15) || (width & 15))
            return ERR_BAD_WIDTH_OR_HEIGHT;
      info.nc = getbyte();
      if (info.nc > MAXCOMP)
            return ERR_TOO_MANY_COMPPS;
      for (i = 0; i < info.nc; i++) {
            int h, v;
            comps[i].cid = getbyte();
            comps[i].hv = getbyte();
            v = comps[i].hv & 15;
            h = comps[i].hv >> 4;
            comps[i].tq = getbyte();
            if (h > 3 || v > 3)
                  return ERR_ILLEGAL_HV;
            if (comps[i].tq > 3)
                  return ERR_QUANT_TABLE_SELECTOR;
      }
      if (readtables(M_SOS))
            return ERR_BAD_TABLES;
      getword();
      info.ns = getbyte();
      if (info.ns != 3)
            return ERR_NOT_YCBCR_221111;
      for (i = 0; i < 3; i++) {
            dscans[i].cid = getbyte();
            tdc = getbyte();
            tac = tdc & 15;
            tdc >>= 4;
            if (tdc > 1 || tac > 1)
                  return ERR_QUANT_TABLE_SELECTOR;
            for (j = 0; j < info.nc; j++)
                  if (comps[j].cid == dscans[i].cid)
                        break;
            if (j == info.nc)
                  return ERR_UNKNOWN_CID_IN_SCAN;
            dscans[i].hv = comps[j].hv;
            dscans[i].tq = comps[j].tq;
            dscans[i].hudc.dhuff = dec_huffdc + tdc;
            dscans[i].huac.dhuff = dec_huffac + tac;
      }
      
      i = getbyte();
      j = getbyte();
      m = getbyte();
      
      if (i != 0 || j != 63 || m != 0)
            return ERR_NOT_SEQUENTIAL_DCT;
      
      if (dscans[0].cid != 1 || dscans[1].cid != 2 || dscans[2].cid != 3)
            return ERR_NOT_YCBCR_221111;

      if (dscans[0].hv != 0x22 || dscans[1].hv != 0x11 || dscans[2].hv != 0x11)
            return ERR_NOT_YCBCR_221111;

      mcusx = width >> 4;
      mcusy = height >> 4;


      idctqtab(quant[dscans[0].tq], decdata->dquant[0]);
      idctqtab(quant[dscans[1].tq], decdata->dquant[1]);
      idctqtab(quant[dscans[2].tq], decdata->dquant[2]);
      initcol(decdata->dquant);
      setinput(&in, datap);

#if 0
      /* landing zone */
      img[len] = 0;
      img[len + 1] = 0xff;
      img[len + 2] = M_EOF;
#endif

      dec_initscans();

      dscans[0].next = 6 - 4;
      dscans[1].next = 6 - 4 - 1;
      dscans[2].next = 6 - 4 - 1 - 1;     /* 411 encoding */
      for (my = 0; my < mcusy; my++) {
            for (mx = 0; mx < mcusx; mx++) {
                  if (info.dri && !--info.nm)
                        if (dec_checkmarker())
                              return ERR_WRONG_MARKER;
                  
                  decode_mcus(&in, decdata->dcts, 6, dscans, max);
                  idct(decdata->dcts, decdata->out, decdata->dquant[0], IFIX(128.5), max[0]);
                  idct(decdata->dcts + 64, decdata->out + 64, decdata->dquant[0], IFIX(128.5), max[1]);
                  idct(decdata->dcts + 128, decdata->out + 128, decdata->dquant[0], IFIX(128.5), max[2]);
                  idct(decdata->dcts + 192, decdata->out + 192, decdata->dquant[0], IFIX(128.5), max[3]);
                  idct(decdata->dcts + 256, decdata->out + 256, decdata->dquant[1], IFIX(0.5), max[4]);
                  idct(decdata->dcts + 320, decdata->out + 320, decdata->dquant[2], IFIX(0.5), max[5]);

                  switch (depth) {
                  case 24:
                        col221111(decdata->out, pic + (my * 16 * mcusx + mx) * 16 * 3, mcusx * 16 * 3);
                        break;
                  case 16:
                        col221111_16(decdata->out, pic + (my * 16 * mcusx + mx) * (16 * 2), mcusx * (16 * 2));
                        break;
                  default:
                        return ERR_DEPTH_MISMATCH;
                        break;
                  }
            }
      }
      
      m = dec_readmarker(&in);
      if (m != M_EOI)
            return ERR_NO_EOI;

      return 0;
}

/****************************************************************/
/**************       huffman decoder             ***************/
/****************************************************************/

static int fillbits __P((struct in *, int, unsigned int));
static int dec_rec2
__P((struct in *, struct dec_hufftbl *, int *, int, int));

static void setinput(in, p)
struct in *in;
unsigned char *p;
{
      in->p = p;
      in->left = 0;
      in->bits = 0;
      in->marker = 0;
}

static int fillbits(in, le, bi)
struct in *in;
int le;
unsigned int bi;
{
      int b, m;

      if (in->marker) {
            if (le <= 16)
                  in->bits = bi << 16, le += 16;
            return le;
      }
      while (le <= 24) {
            b = *in->p++;
            if (b == 0xff && (m = *in->p++) != 0) {
                  if (m == M_EOF) {
                        if (in->func && (m = in->func(in->data)) == 0)
                              continue;
                  }
                  in->marker = m;
                  if (le <= 16)
                        bi = bi << 16, le += 16;
                  break;
            }
            bi = bi << 8 | b;
            le += 8;
      }
      in->bits = bi;          /* tmp... 2 return values needed */
      return le;
}

static int dec_readmarker(in)
struct in *in;
{
      int m;

      in->left = fillbits(in, in->left, in->bits);
      if ((m = in->marker) == 0)
            return 0;
      in->left = 0;
      in->marker = 0;
      return m;
}

#define LEBI_DCL  int le, bi
#define LEBI_GET(in)    (le = in->left, bi = in->bits)
#define LEBI_PUT(in)    (in->left = le, in->bits = bi)

#define GETBITS(in, n) (                              \
  (le < (n) ? le = fillbits(in, le, bi), bi = in->bits : 0),      \
  (le -= (n)),                                        \
  bi >> le & ((1 << (n)) - 1)                         \
)

#define UNGETBITS(in, n) (    \
  le += (n)             \
)


static int dec_rec2(in, hu, runp, c, i)
struct in *in;
struct dec_hufftbl *hu;
int *runp;
int c, i;
{
      LEBI_DCL;

      LEBI_GET(in);
      if (i) {
            UNGETBITS(in, i & 127);
            *runp = i >> 8 & 15;
            i >>= 16;
      } else {
            for (i = DECBITS; (c = ((c << 1) | GETBITS(in, 1))) >= (hu->maxcode[i]); i++);
            if (i >= 16) {
                  in->marker = M_BADHUFF;
                  return 0;
            }
            i = hu->vals[hu->valptr[i] + c - hu->maxcode[i - 1] * 2];
            *runp = i >> 4;
            i &= 15;
      }
      if (i == 0) {           /* sigh, 0xf0 is 11 bit */
            LEBI_PUT(in);
            return 0;
      }
      /* receive part */
      c = GETBITS(in, i);
      if (c < (1 << (i - 1)))
            c += (-1 << i) + 1;
      LEBI_PUT(in);
      return c;
}

#define DEC_REC(in, hu, r, i)  (    \
  r = GETBITS(in, DECBITS),         \
  i = hu->llvals[r],                \
  i & 128 ?                   \
    (                         \
      UNGETBITS(in, i & 127),       \
      r = i >> 8 & 15,              \
      i >> 16                       \
    )                         \
  :                           \
    (                         \
      LEBI_PUT(in),                 \
      i = dec_rec2(in, hu, &r, r, i),     \
      LEBI_GET(in),                 \
      i                             \
    )                         \
)

static void decode_mcus(in, dct, n, sc, maxp)
struct in *in;
int *dct;
int n;
struct scan *sc;
int *maxp;
{
      struct dec_hufftbl *hu;
      int i, r, t;
      LEBI_DCL;

      memset(dct, 0, n * 64 * sizeof(*dct));
      LEBI_GET(in);
      while (n-- > 0) {
            hu = sc->hudc.dhuff;
            *dct++ = (sc->dc += DEC_REC(in, hu, r, t));

            hu = sc->huac.dhuff;
            i = 63;
            while (i > 0) {
                  t = DEC_REC(in, hu, r, t);
                  if (t == 0 && r == 0) {
                        dct += i;
                        break;
                  }
                  dct += r;
                  *dct++ = t;
                  i -= r + 1;
            }
            *maxp++ = 64 - i;
            if (n == sc->next)
                  sc++;
      }
      LEBI_PUT(in);
}

static void dec_makehuff(hu, hufflen, huffvals)
struct dec_hufftbl *hu;
int *hufflen;
unsigned char *huffvals;
{
      int code, k, i, j, d, x, c, v;
      for (i = 0; i < (1 << DECBITS); i++)
            hu->llvals[i] = 0;

/*
 * llvals layout:
 *
 * value v already known, run r, backup u bits:
 *  vvvvvvvvvvvvvvvv 0000 rrrr 1 uuuuuuu
 * value unknown, size b bits, run r, backup u bits:
 *  000000000000bbbb 0000 rrrr 0 uuuuuuu
 * value and size unknown:
 *  0000000000000000 0000 0000 0 0000000
 */
      code = 0;
      k = 0;
      for (i = 0; i < 16; i++, code <<= 1) {    /* sizes */
            hu->valptr[i] = k;
            for (j = 0; j < hufflen[i]; j++) {
                  hu->vals[k] = *huffvals++;
                  if (i < DECBITS) {
                        c = code << (DECBITS - 1 - i);
                        v = hu->vals[k] & 0x0f; /* size */
                        for (d = 1 << (DECBITS - 1 - i); --d >= 0;) {
                              if (v + i < DECBITS) {  /* both fit in table */
                                    x = d >> (DECBITS - 1 - v -
                                            i);
                                    if (v && x < (1 << (v - 1)))
                                          x += (-1 << v) + 1;
                                    x = x << 16 | (hu-> vals[k] & 0xf0) << 4 |
                                          (DECBITS - (i + 1 + v)) | 128;
                              } else
                                    x = v << 16 | (hu-> vals[k] & 0xf0) << 4 |
                                            (DECBITS - (i + 1));
                              hu->llvals[c | d] = x;
                        }
                  }
                  code++;
                  k++;
            }
            hu->maxcode[i] = code;
      }
      hu->maxcode[16] = 0x20000;    /* always terminate decode */
}

/****************************************************************/
/**************             idct                  ***************/
/****************************************************************/

#define ONE ((PREC)IFIX(1.))
#define S2  ((PREC)IFIX(0.382683432))
#define C2  ((PREC)IFIX(0.923879532))
#define C4  ((PREC)IFIX(0.707106781))

#define S22 ((PREC)IFIX(2 * 0.382683432))
#define C22 ((PREC)IFIX(2 * 0.923879532))
#define IC4 ((PREC)IFIX(1 / 0.707106781))

#define C3IC1 ((PREC)IFIX(0.847759065))   /* c3/c1 */
#define C5IC1 ((PREC)IFIX(0.566454497))   /* c5/c1 */
#define C7IC1 ((PREC)IFIX(0.198912367))   /* c7/c1 */

#define XPP(a,b) (t = a + b, b = a - b, a = t)
#define XMP(a,b) (t = a - b, b = a + b, a = t)
#define XPM(a,b) (t = a + b, b = b - a, a = t)

#define ROT(a,b,s,c) (  t = IMULT(a + b, s),    \
                  a = IMULT(a, c - s) + t,      \
                  b = IMULT(b, c + s) - t)

#define IDCT            \
(                 \
  XPP(t0, t1),          \
  XMP(t2, t3),          \
  t2 = IMULT(t2, IC4) - t3,   \
  XPP(t0, t3),          \
  XPP(t1, t2),          \
  XMP(t4, t7),          \
  XPP(t5, t6),          \
  XMP(t5, t7),          \
  t5 = IMULT(t5, IC4),  \
  ROT(t4, t6, S22, C22),\
  t6 -= t7,       \
  t5 -= t6,       \
  t4 -= t5,       \
  XPP(t0, t7),          \
  XPP(t1, t6),          \
  XPP(t2, t5),          \
  XPP(t3, t4)           \
)

static unsigned char zig2[64] = {
      0, 2, 3, 9, 10, 20, 21, 35,
      14, 16, 25, 31, 39, 46, 50, 57,
      5, 7, 12, 18, 23, 33, 37, 48,
      27, 29, 41, 44, 52, 55, 59, 62,
      15, 26, 30, 40, 45, 51, 56, 58,
      1, 4, 8, 11, 19, 22, 34, 36,
      28, 42, 43, 53, 54, 60, 61, 63,
      6, 13, 17, 24, 32, 38, 47, 49
};

void idct(in, out, quant, off, max)
int *in;
int *out;
PREC *quant;
PREC off;
int max;
{
      PREC t0, t1, t2, t3, t4, t5, t6, t7, t;
      PREC tmp[64], *tmpp;
      int i, j;
      unsigned char *zig2p;

      t0 = off;
      if (max == 1) {
            t0 += in[0] * quant[0];
            for (i = 0; i < 64; i++)
                  out[i] = ITOINT(t0);
            return;
      }
      zig2p = zig2;
      tmpp = tmp;
      for (i = 0; i < 8; i++) {
            j = *zig2p++;
            t0 += in[j] * quant[j];
            j = *zig2p++;
            t5 = in[j] * quant[j];
            j = *zig2p++;
            t2 = in[j] * quant[j];
            j = *zig2p++;
            t7 = in[j] * quant[j];
            j = *zig2p++;
            t1 = in[j] * quant[j];
            j = *zig2p++;
            t4 = in[j] * quant[j];
            j = *zig2p++;
            t3 = in[j] * quant[j];
            j = *zig2p++;
            t6 = in[j] * quant[j];
            IDCT;
            tmpp[0 * 8] = t0;
            tmpp[1 * 8] = t1;
            tmpp[2 * 8] = t2;
            tmpp[3 * 8] = t3;
            tmpp[4 * 8] = t4;
            tmpp[5 * 8] = t5;
            tmpp[6 * 8] = t6;
            tmpp[7 * 8] = t7;
            tmpp++;
            t0 = 0;
      }
      for (i = 0; i < 8; i++) {
            t0 = tmp[8 * i + 0];
            t1 = tmp[8 * i + 1];
            t2 = tmp[8 * i + 2];
            t3 = tmp[8 * i + 3];
            t4 = tmp[8 * i + 4];
            t5 = tmp[8 * i + 5];
            t6 = tmp[8 * i + 6];
            t7 = tmp[8 * i + 7];
            IDCT;
            out[8 * i + 0] = ITOINT(t0);
            out[8 * i + 1] = ITOINT(t1);
            out[8 * i + 2] = ITOINT(t2);
            out[8 * i + 3] = ITOINT(t3);
            out[8 * i + 4] = ITOINT(t4);
            out[8 * i + 5] = ITOINT(t5);
            out[8 * i + 6] = ITOINT(t6);
            out[8 * i + 7] = ITOINT(t7);
      }
}

static unsigned char zig[64] = {
      0, 1, 5, 6, 14, 15, 27, 28,
      2, 4, 7, 13, 16, 26, 29, 42,
      3, 8, 12, 17, 25, 30, 41, 43,
      9, 11, 18, 24, 31, 40, 44, 53,
      10, 19, 23, 32, 39, 45, 52, 54,
      20, 22, 33, 38, 46, 51, 55, 60,
      21, 34, 37, 47, 50, 56, 59, 61,
      35, 36, 48, 49, 57, 58, 62, 63
};

static PREC aaidct[8] = {
      IFIX(0.3535533906), IFIX(0.4903926402),
      IFIX(0.4619397663), IFIX(0.4157348062),
      IFIX(0.3535533906), IFIX(0.2777851165),
      IFIX(0.1913417162), IFIX(0.0975451610)
};


static void idctqtab(qin, qout)
unsigned char *qin;
PREC *qout;
{
      int i, j;

      for (i = 0; i < 8; i++)
            for (j = 0; j < 8; j++)
                  qout[zig[i * 8 + j]] = qin[zig[i * 8 + j]] * 
                                    IMULT(aaidct[i], aaidct[j]);
}

static void scaleidctqtab(q, sc)
PREC *q;
PREC sc;
{
      int i;

      for (i = 0; i < 64; i++)
            q[i] = IMULT(q[i], sc);
}

/****************************************************************/
/**************          color decoder            ***************/
/****************************************************************/

#define ROUND

/*
 * YCbCr Color transformation:
 *
 * y:0..255   Cb:-128..127   Cr:-128..127
 *
 *      R = Y                + 1.40200 * Cr
 *      G = Y - 0.34414 * Cb - 0.71414 * Cr
 *      B = Y + 1.77200 * Cb
 *
 * =>
 *      Cr *= 1.40200;
 *      Cb *= 1.77200;
 *      Cg = 0.19421 * Cb + .50937 * Cr;
 *      R = Y + Cr;
 *      G = Y - Cg;
 *      B = Y + Cb;
 *
 * =>
 *      Cg = (50 * Cb + 130 * Cr + 128) >> 8;
 */

static void initcol(q)
PREC q[][64];
{
      scaleidctqtab(q[1], IFIX(1.77200));
      scaleidctqtab(q[2], IFIX(1.40200));
}

/* This is optimized for the stupid sun SUNWspro compiler. */
#define STORECLAMP(a,x)                   \
(                                   \
  (a) = (x),                              \
  (unsigned int)(x) >= 256 ?              \
    ((a) = (x) < 0 ? 0 : 255)             \
  :                                 \
    0                               \
)

#define CLAMP(x) ((unsigned int)(x) >= 256 ? ((x) < 0 ? 0 : 255) : (x))

#ifdef ROUND

#define CBCRCG(yin, xin)                  \
(                                   \
  cb = outc[0 +yin*8+xin],                \
  cr = outc[64+yin*8+xin],                \
  cg = (50 * cb + 130 * cr + 128) >> 8          \
)

#else

#define CBCRCG(yin, xin)                  \
(                                   \
  cb = outc[0 +yin*8+xin],                \
  cr = outc[64+yin*8+xin],                \
  cg = (3 * cb + 8 * cr) >> 4             \
)

#endif

#define PIC(yin, xin, p, xout)                  \
(                                   \
  y = outy[(yin) * 8 + xin],              \
  STORECLAMP(p[(xout) * 3 + 0], y + cr),  \
  STORECLAMP(p[(xout) * 3 + 1], y - cg),  \
  STORECLAMP(p[(xout) * 3 + 2], y + cb)         \
)

#ifdef __LITTLE_ENDIAN
#define PIC_16(yin, xin, p, xout, add)           \
(                                                \
  y = outy[(yin) * 8 + xin],                     \
  y = ((CLAMP(y + cr + add*2+1) & 0xf8) <<  8) | \
      ((CLAMP(y - cg + add    ) & 0xfc) <<  3) | \
      ((CLAMP(y + cb + add*2+1)       ) >>  3),  \
  p[(xout) * 2 + 0] = y & 0xff,                  \
  p[(xout) * 2 + 1] = y >> 8                     \
)
#else
#ifdef CONFIG_PPC
#define PIC_16(yin, xin, p, xout, add)           \
(                                                \
  y = outy[(yin) * 8 + xin],                     \
  y = ((CLAMP(y + cr + add*2+1) & 0xf8) <<  7) | \
      ((CLAMP(y - cg + add*2+1) & 0xf8) <<  2) | \
      ((CLAMP(y + cb + add*2+1)       ) >>  3),  \
  p[(xout) * 2 + 0] = y >> 8,                    \
  p[(xout) * 2 + 1] = y & 0xff                   \
)
#else
#define PIC_16(yin, xin, p, xout, add)           \
(                                                \
  y = outy[(yin) * 8 + xin],                     \
  y = ((CLAMP(y + cr + add*2+1) & 0xf8) <<  8) | \
      ((CLAMP(y - cg + add    ) & 0xfc) <<  3) | \
      ((CLAMP(y + cb + add*2+1)       ) >>  3),  \
  p[(xout) * 2 + 0] = y >> 8,                    \
  p[(xout) * 2 + 1] = y & 0xff                   \
)
#endif
#endif

#define PIC221111(xin)                                \
(                                               \
  CBCRCG(0, xin),                               \
  PIC(xin / 4 * 8 + 0, (xin & 3) * 2 + 0, pic0, xin * 2 + 0),     \
  PIC(xin / 4 * 8 + 0, (xin & 3) * 2 + 1, pic0, xin * 2 + 1),     \
  PIC(xin / 4 * 8 + 1, (xin & 3) * 2 + 0, pic1, xin * 2 + 0),     \
  PIC(xin / 4 * 8 + 1, (xin & 3) * 2 + 1, pic1, xin * 2 + 1)      \
)

#define PIC221111_16(xin)                                               \
(                                                                 \
  CBCRCG(0, xin),                                                 \
  PIC_16(xin / 4 * 8 + 0, (xin & 3) * 2 + 0, pic0, xin * 2 + 0, 3),     \
  PIC_16(xin / 4 * 8 + 0, (xin & 3) * 2 + 1, pic0, xin * 2 + 1, 0),     \
  PIC_16(xin / 4 * 8 + 1, (xin & 3) * 2 + 0, pic1, xin * 2 + 0, 1),     \
  PIC_16(xin / 4 * 8 + 1, (xin & 3) * 2 + 1, pic1, xin * 2 + 1, 2)      \
)

static void col221111(out, pic, width)
int *out;
unsigned char *pic;
int width;
{
      int i, j, k;
      unsigned char *pic0, *pic1;
      int *outy, *outc;
      int cr, cg, cb, y;

      pic0 = pic;
      pic1 = pic + width;
      outy = out;
      outc = out + 64 * 4;
      for (i = 2; i > 0; i--) {
            for (j = 4; j > 0; j--) {
                  for (k = 0; k < 8; k++) {
                        PIC221111(k);
                  }
                  outc += 8;
                  outy += 16;
                  pic0 += 2 * width;
                  pic1 += 2 * width;
            }
            outy += 64 * 2 - 16 * 4;
      }
}

static void col221111_16(out, pic, width)
int *out;
unsigned char *pic;
int width;
{
      int i, j, k;
      unsigned char *pic0, *pic1;
      int *outy, *outc;
      int cr, cg, cb, y;

      pic0 = pic;
      pic1 = pic + width;
      outy = out;
      outc = out + 64 * 4;
      for (i = 2; i > 0; i--) {
            for (j = 4; j > 0; j--) {
                  for (k = 0; k < 8; k++) {
                      PIC221111_16(k);
                  }
                  outc += 8;
                  outy += 16;
                  pic0 += 2 * width;
                  pic1 += 2 * width;
            }
            outy += 64 * 2 - 16 * 4;
      }
}

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