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#define FIX_1_082392200 ((s32) 277) /* FIX(1.082392200) */
#define FIX_1_414213562 ((s32) 362) /* FIX(1.414213562) */
#define FIX_1_847759065 ((s32) 473) /* FIX(1.847759065) */
#define FIX_2_613125930 ((s32) 669) /* FIX(2.613125930) */
#define DESCALE(x) (s16)( ((x)+4) >> 3)
/* clip yuv to 16..235 (should be 16..240 for cr/cb but ... */
#define RL(x) ((x)>235) ? 235 : (((x)<16) ? 16 : (x))
#define MULTIPLY(var,const) (((s32) ((var) * (const)) + 128)>>8)
void RTjpeg_idct_init(void)
{
int i;
for(i=0; i<64; i++)
{
RTjpeg_liqt[i]=((u64)RTjpeg_liqt[i]*RTjpeg_aan_tab[i])>>32;
RTjpeg_ciqt[i]=((u64)RTjpeg_ciqt[i]*RTjpeg_aan_tab[i])>>32;
}
}
void RTjpeg_idct(u8 *odata, s16 *data, int rskip)
{
s32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
s32 tmp10, tmp11, tmp12, tmp13;
s32 z5, z10, z11, z12, z13;
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];
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;
}
tmp0 = inptr[0];
tmp1 = inptr[16];
tmp2 = inptr[32];
tmp3 = inptr[48];
tmp10 = tmp0 + tmp2;
tmp11 = tmp0 - tmp2;
tmp13 = tmp1 + tmp3;
tmp12 = MULTIPLY(tmp1 - tmp3, FIX_1_414213562) - tmp13;
tmp0 = tmp10 + tmp13;
tmp3 = tmp10 - tmp13;
tmp1 = tmp11 + tmp12;
tmp2 = tmp11 - tmp12;
tmp4 = inptr[8];
tmp5 = inptr[24];
tmp6 = inptr[40];
tmp7 = inptr[56];
z13 = tmp6 + tmp5;
z10 = tmp6 - tmp5;
z11 = tmp4 + tmp7;
z12 = tmp4 - tmp7;
tmp7 = z11 + z13;
tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562);
z5 = MULTIPLY(z10 + z12, FIX_1_847759065);
tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5;
tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5;
tmp6 = tmp12 - tmp7;
tmp5 = tmp11 - tmp6;
tmp4 = tmp10 + tmp5;
wsptr[0] = (s32) (tmp0 + tmp7);
wsptr[56] = (s32) (tmp0 - tmp7);
wsptr[8] = (s32) (tmp1 + tmp6);
wsptr[48] = (s32) (tmp1 - tmp6);
wsptr[16] = (s32) (tmp2 + tmp5);
wsptr[40] = (s32) (tmp2 - tmp5);
wsptr[32] = (s32) (tmp3 + tmp4);
wsptr[24] = (s32) (tmp3 - tmp4);
inptr++;
wsptr++;
}
wsptr = workspace;
for (ctr = 0; ctr < 8; ctr++) {
outptr = &(odata[ctr*rskip]);
tmp10 = wsptr[0] + wsptr[4];
tmp11 = wsptr[0] - wsptr[4];
tmp13 = wsptr[2] + wsptr[6];
tmp12 = MULTIPLY(wsptr[2] - wsptr[6], FIX_1_414213562) - tmp13;
tmp0 = tmp10 + tmp13;
tmp3 = tmp10 - tmp13;
tmp1 = tmp11 + tmp12;
tmp2 = tmp11 - tmp12;
z13 = wsptr[5] + wsptr[3];
z10 = wsptr[5] - wsptr[3];
z11 = wsptr[1] + wsptr[7];
z12 = wsptr[1] - wsptr[7];
tmp7 = z11 + z13;
tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562);
z5 = MULTIPLY(z10 + z12, FIX_1_847759065);
tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5;
tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5;
tmp6 = tmp12 - tmp7;
tmp5 = tmp11 - tmp6;
tmp4 = tmp10 + tmp5;
outptr[0] = RL(DESCALE(tmp0 + tmp7));
outptr[7] = RL(DESCALE(tmp0 - tmp7));
outptr[1] = RL(DESCALE(tmp1 + tmp6));
outptr[6] = RL(DESCALE(tmp1 - tmp6));
outptr[2] = RL(DESCALE(tmp2 + tmp5));
outptr[5] = RL(DESCALE(tmp2 - tmp5));
outptr[4] = RL(DESCALE(tmp3 + tmp4));
outptr[3] = RL(DESCALE(tmp3 - tmp4));
wsptr += 8;
}
}
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