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#include <sys/types.h>
#define FIX_0_298631336 ((s32) 2446) /* FIX(0.298631336) */
#define FIX_0_390180644 ((s32) 3196) /* FIX(0.390180644) */
#define FIX_0_541196100 ((s32) 4433) /* FIX(0.541196100) */
#define FIX_0_765366865 ((s32) 6270) /* FIX(0.765366865) */
#define FIX_0_899976223 ((s32) 7373) /* FIX(0.899976223) */
#define FIX_1_175875602 ((s32) 9633) /* FIX(1.175875602) */
#define FIX_1_501321110 ((s32) 12299) /* FIX(1.501321110) */
#define FIX_1_847759065 ((s32) 15137) /* FIX(1.847759065) */
#define FIX_1_961570560 ((s32) 16069) /* FIX(1.961570560) */
#define FIX_2_053119869 ((s32) 16819) /* FIX(2.053119869) */
#define FIX_2_562915447 ((s32) 20995) /* FIX(2.562915447) */
#define FIX_3_072711026 ((s32) 25172) /* FIX(3.072711026) */
#define MULTIPLY(var,const) ( (s32) ((var)*(const)) )
#define DESCALE(x,n) ((x)>>(n))
/* clip yuv to 16..235 (should be 16..240 for cr/cb but ... */
#define RL(x) ((x)>235) ? 235 : (((x)<16) ? 16 : (x))
void RTjpeg_idct_init(void)
{
}
void RTjpeg_idct(u8 *odata, s16 *data, int rskip)
{
s32 tmp0, tmp1, tmp2, tmp3;
s32 tmp10, tmp11, tmp12, tmp13;
s32 z1, z2, z3, z4, z5;
s16 *inptr;
s32 *wsptr;
u8 *outptr;
int ctr;
s32 dcval;
s32 workspace[64];
inptr = data;
wsptr = workspace;
for (ctr = 8; ctr > 0; ctr--) {
if ((inptr[8] | inptr[16] | inptr[24] |
inptr[32] | inptr[40] | inptr[48] | inptr[56]) == 0) {
dcval=inptr[0]<<2;
wsptr[0] = dcval;
wsptr[8] = dcval;
wsptr[16] = dcval;
wsptr[24] = dcval;
wsptr[32] = dcval;
wsptr[40] = dcval;
wsptr[48] = dcval;
wsptr[56] = dcval;
inptr++;
wsptr++;
continue;
}
z2 = inptr[16];
z3 = inptr[48];
z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065);
tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865);
z2 = inptr[0];
z3 = inptr[32];
tmp0 = (z2 + z3) << 13;
tmp1 = (z2 - z3) << 13;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
tmp0 = inptr[56];
tmp1 = inptr[40];
tmp2 = inptr[24];
tmp3 = inptr[8];
z1 = tmp0 + tmp3;
z2 = tmp1 + tmp2;
z3 = tmp0 + tmp2;
z4 = tmp1 + tmp3;
z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 += z2 + z4;
tmp2 += z2 + z3;
tmp3 += z1 + z4;
wsptr[0] = (int) DESCALE(tmp10 + tmp3, 11);
wsptr[56] = (int) DESCALE(tmp10 - tmp3, 11);
wsptr[8] = (int) DESCALE(tmp11 + tmp2, 11);
wsptr[48] = (int) DESCALE(tmp11 - tmp2, 11);
wsptr[16] = (int) DESCALE(tmp12 + tmp1, 11);
wsptr[40] = (int) DESCALE(tmp12 - tmp1, 11);
wsptr[24] = (int) DESCALE(tmp13 + tmp0, 11);
wsptr[32] = (int) DESCALE(tmp13 - tmp0, 11);
inptr++; /* advance pointers to next column */
wsptr++;
}
wsptr = workspace;
for (ctr = 0; ctr < 8; ctr++) {
outptr=&(odata[ctr*rskip]);
z2 = (s32) wsptr[2];
z3 = (s32) wsptr[6];
z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065);
tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865);
tmp0 = ((s32) wsptr[0] + (s32) wsptr[4]) << 13;
tmp1 = ((s32) wsptr[0] - (s32) wsptr[4]) << 13;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
tmp0 = (s32) wsptr[7];
tmp1 = (s32) wsptr[5];
tmp2 = (s32) wsptr[3];
tmp3 = (s32) wsptr[1];
z1 = tmp0 + tmp3;
z2 = tmp1 + tmp2;
z3 = tmp0 + tmp2;
z4 = tmp1 + tmp3;
z5 = MULTIPLY(z3 + z4, FIX_1_175875602);
tmp0 = MULTIPLY(tmp0, FIX_0_298631336);
tmp1 = MULTIPLY(tmp1, FIX_2_053119869);
tmp2 = MULTIPLY(tmp2, FIX_3_072711026);
tmp3 = MULTIPLY(tmp3, FIX_1_501321110);
z1 = MULTIPLY(z1, - FIX_0_899976223);
z2 = MULTIPLY(z2, - FIX_2_562915447);
z3 = MULTIPLY(z3, - FIX_1_961570560);
z4 = MULTIPLY(z4, - FIX_0_390180644);
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 += z2 + z4;
tmp2 += z2 + z3;
tmp3 += z1 + z4;
outptr[0] = (s32) RL(DESCALE(tmp10 + tmp3, 18));
outptr[7] = (s32) RL(DESCALE(tmp10 - tmp3, 18));
outptr[1] = (s32) RL(DESCALE(tmp11 + tmp2, 18));
outptr[6] = (s32) RL(DESCALE(tmp11 - tmp2, 18));
outptr[2] = (s32) RL(DESCALE(tmp12 + tmp1, 18));
outptr[5] = (s32) RL(DESCALE(tmp12 - tmp1, 18));
outptr[3] = (s32) RL(DESCALE(tmp13 + tmp0, 18));
outptr[4] = (s32) RL(DESCALE(tmp13 - tmp0, 18));
wsptr += 8;
}
}
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