jpeg_fdct_islow (DCTELEM * data)
{
INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
INT32 tmp10, tmp11, tmp12, tmp13;
INT32 z1, z2, z3, z4, z5;
DCTELEM *dataptr;
int ctr;
SHIFT_TEMPS
/* Pass 1: process rows. */
/* Note results are scaled up by sqrt(8) compared to a true DCT; */
/* furthermore, we scale the results by 2**PASS1_BITS. */
dataptr = data;
for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
tmp0 = dataptr[0] + dataptr[7];
tmp7 = dataptr[0] - dataptr[7];
tmp1 = dataptr[1] + dataptr[6];
tmp6 = dataptr[1] - dataptr[6];
tmp2 = dataptr[2] + dataptr[5];
tmp5 = dataptr[2] - dataptr[5];
tmp3 = dataptr[3] + dataptr[4];
tmp4 = dataptr[3] - dataptr[4];
/* Even part per LL&M figure 1 --- note that published figure is faulty;
* rotator "sqrt(2)*c1" should be "sqrt(2)*c6".
*/
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
dataptr[0] = (DCTELEM) LEFT_SHIFT(tmp10 + tmp11, PASS1_BITS);
dataptr[4] = (DCTELEM) LEFT_SHIFT(tmp10 - tmp11, PASS1_BITS);
z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100);
dataptr[2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865),
CONST_BITS-PASS1_BITS);
dataptr[6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065),
CONST_BITS-PASS1_BITS);
/* Odd part per figure 8 --- note paper omits factor of sqrt(2).
* cK represents cos(K*pi/16).
* i0..i3 in the paper are tmp4..tmp7 here.
*/
z1 = tmp4 + tmp7;
z2 = tmp5 + tmp6;
z3 = tmp4 + tmp6;
z4 = tmp5 + tmp7;
z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
tmp7 = MULTIPLY(tmp7, 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;
dataptr[7] = (DCTELEM) DESCALE(tmp4 + z1 + z3, CONST_BITS-PASS1_BITS);
dataptr[5] = (DCTELEM) DESCALE(tmp5 + z2 + z4, CONST_BITS-PASS1_BITS);
dataptr[3] = (DCTELEM) DESCALE(tmp6 + z2 + z3, CONST_BITS-PASS1_BITS);
dataptr[1] = (DCTELEM) DESCALE(tmp7 + z1 + z4, CONST_BITS-PASS1_BITS);
dataptr += DCTSIZE; /* advance pointer to next row */
}
/* Pass 2: process columns.
* We remove the PASS1_BITS scaling, but leave the results scaled up
* by an overall factor of 8.
*/
dataptr = data;
for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7];
tmp7 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7];
tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6];
tmp6 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6];
tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5];
tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5];
tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4];
tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4];
/* Even part per LL&M figure 1 --- note that published figure is faulty;
* rotator "sqrt(2)*c1" should be "sqrt(2)*c6".
*/
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
dataptr[DCTSIZE*0] = (DCTELEM) DESCALE(tmp10 + tmp11, PASS1_BITS);
dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(tmp10 - tmp11, PASS1_BITS);
z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100);
dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865),
CONST_BITS+PASS1_BITS);
dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065),
CONST_BITS+PASS1_BITS);
/* Odd part per figure 8 --- note paper omits factor of sqrt(2).
* cK represents cos(K*pi/16).
* i0..i3 in the paper are tmp4..tmp7 here.
*/
z1 = tmp4 + tmp7;
z2 = tmp5 + tmp6;
z3 = tmp4 + tmp6;
z4 = tmp5 + tmp7;
z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
tmp7 = MULTIPLY(tmp7, 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;
dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp4 + z1 + z3,
CONST_BITS+PASS1_BITS);
dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp5 + z2 + z4,
CONST_BITS+PASS1_BITS);
dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp6 + z2 + z3,
CONST_BITS+PASS1_BITS);
dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp7 + z1 + z4,
CONST_BITS+PASS1_BITS);
dataptr++; /* advance pointer to next column */
}
}
jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
INT32 tmp0, tmp2, tmp10, tmp12;
INT32 z1, z2, z3, z4;
JCOEFPTR inptr;
ISLOW_MULT_TYPE * quantptr;
int * wsptr;
JSAMPROW outptr;
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
int ctr;
int workspace[DCTSIZE*4]; /* buffers data between passes */
SHIFT_TEMPS
/* Pass 1: process columns from input, store into work array. */
inptr = coef_block;
quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
wsptr = workspace;
for (ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr--) {
/* Don't bother to process column 4, because second pass won't use it */
if (ctr == DCTSIZE-4)
continue;
if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*5] == 0 &&
inptr[DCTSIZE*6] == 0 && inptr[DCTSIZE*7] == 0) {
/* AC terms all zero; we need not examine term 4 for 4x4 output */
int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;
wsptr[DCTSIZE*0] = dcval;
wsptr[DCTSIZE*1] = dcval;
wsptr[DCTSIZE*2] = dcval;
wsptr[DCTSIZE*3] = dcval;
continue;
}
/* Even part */
tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
tmp0 <<= (CONST_BITS+1);
z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
tmp2 = MULTIPLY(z2, FIX_1_847759065) + MULTIPLY(z3, - FIX_0_765366865);
tmp10 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
/* Odd part */
z1 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
z2 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
z4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */
+ MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */
+ MULTIPLY(z3, - FIX_2_172734803) /* sqrt(2) * (-c1-c5) */
+ MULTIPLY(z4, FIX_1_061594337); /* sqrt(2) * (c5+c7) */
tmp2 = MULTIPLY(z1, - FIX_0_509795579) /* sqrt(2) * (c7-c5) */
+ MULTIPLY(z2, - FIX_0_601344887) /* sqrt(2) * (c5-c1) */
+ MULTIPLY(z3, FIX_0_899976223) /* sqrt(2) * (c3-c7) */
+ MULTIPLY(z4, FIX_2_562915447); /* sqrt(2) * (c1+c3) */
/* Final output stage */
wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp2, CONST_BITS-PASS1_BITS+1);
wsptr[DCTSIZE*3] = (int) DESCALE(tmp10 - tmp2, CONST_BITS-PASS1_BITS+1);
wsptr[DCTSIZE*1] = (int) DESCALE(tmp12 + tmp0, CONST_BITS-PASS1_BITS+1);
wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 - tmp0, CONST_BITS-PASS1_BITS+1);
}
/* Pass 2: process 4 rows from work array, store into output array. */
wsptr = workspace;
for (ctr = 0; ctr < 4; ctr++) {
outptr = output_buf[ctr] + output_col;
/* It's not clear whether a zero row test is worthwhile here ... */
#ifndef NO_ZERO_ROW_TEST
if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 &&
wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) {
/* AC terms all zero */
JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3)
& RANGE_MASK];
outptr[0] = dcval;
outptr[1] = dcval;
outptr[2] = dcval;
outptr[3] = dcval;
wsptr += DCTSIZE; /* advance pointer to next row */
continue;
}
#endif
/* Even part */
tmp0 = ((INT32) wsptr[0]) << (CONST_BITS+1);
tmp2 = MULTIPLY((INT32) wsptr[2], FIX_1_847759065)
+ MULTIPLY((INT32) wsptr[6], - FIX_0_765366865);
tmp10 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
/* Odd part */
z1 = (INT32) wsptr[7];
z2 = (INT32) wsptr[5];
z3 = (INT32) wsptr[3];
z4 = (INT32) wsptr[1];
tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */
+ MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */
+ MULTIPLY(z3, - FIX_2_172734803) /* sqrt(2) * (-c1-c5) */
+ MULTIPLY(z4, FIX_1_061594337); /* sqrt(2) * (c5+c7) */
tmp2 = MULTIPLY(z1, - FIX_0_509795579) /* sqrt(2) * (c7-c5) */
+ MULTIPLY(z2, - FIX_0_601344887) /* sqrt(2) * (c5-c1) */
+ MULTIPLY(z3, FIX_0_899976223) /* sqrt(2) * (c3-c7) */
+ MULTIPLY(z4, FIX_2_562915447); /* sqrt(2) * (c1+c3) */
/* Final output stage */
outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp2,
CONST_BITS+PASS1_BITS+3+1)
& RANGE_MASK];
outptr[3] = range_limit[(int) DESCALE(tmp10 - tmp2,
CONST_BITS+PASS1_BITS+3+1)
& RANGE_MASK];
outptr[1] = range_limit[(int) DESCALE(tmp12 + tmp0,
CONST_BITS+PASS1_BITS+3+1)
& RANGE_MASK];
outptr[2] = range_limit[(int) DESCALE(tmp12 - tmp0,
CONST_BITS+PASS1_BITS+3+1)
& RANGE_MASK];
wsptr += DCTSIZE; /* advance pointer to next row */
}
}
void jpeg_idct_ifast (
BLOCK_TYPE *inptr,
short *quantptr,
uchar * *outptr,
int output_col)
{
short workspace[64 + 4]; /* buffers data between passes */
short *wsptr=workspace;
__asm{
mov edi, quantptr
mov ebx, inptr
mov esi, wsptr
add esi, 0x07 ;align wsptr to qword
and esi, 0xfffffff8 ;align wsptr to qword
mov eax, esi
/* Odd part */
movq mm1, [ebx + 8*10] ;load inptr[DCTSIZE*5]
pmullw mm1, [edi + 8*10] ;tmp6 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
movq mm0, [ebx + 8*6] ;load inptr[DCTSIZE*3]
pmullw mm0, [edi + 8*6] ;tmp5 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
movq mm3, [ebx + 8*2] ;load inptr[DCTSIZE*1]
movq mm2, mm1 ;copy tmp6 /* phase 6 */
pmullw mm3, [edi + 8*2] ;tmp4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
movq mm4, [ebx + 8*14] ;load inptr[DCTSIZE*1]
paddw mm1, mm0 ;z13 = tmp6 + tmp5;
pmullw mm4, [edi + 8*14] ;tmp7 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
psubw mm2, mm0 ;z10 = tmp6 - tmp5
psllw mm2, 2 ;shift z10
movq mm0, mm2 ;copy z10
pmulhw mm2, fix_184n261 ;MULTIPLY( z12, FIX_1_847759065); /* 2*c2 */
movq mm5, mm3 ;copy tmp4
pmulhw mm0, fix_n184 ;MULTIPLY(z10, -FIX_1_847759065); /* 2*c2 */
paddw mm3, mm4 ;z11 = tmp4 + tmp7;
movq mm6, mm3 ;copy z11 /* phase 5 */
psubw mm5, mm4 ;z12 = tmp4 - tmp7;
psubw mm6, mm1 ;z11-z13
psllw mm5, 2 ;shift z12
movq mm4, [ebx + 8*12] ;load inptr[DCTSIZE*6], even part
movq mm7, mm5 ;copy z12
pmulhw mm5, fix_108n184 ;MULT(z12, (FIX_1_08-FIX_1_84)) //- z5; /* 2*(c2-c6) */ even part
paddw mm3, mm1 ;tmp7 = z11 + z13;
/* Even part */
pmulhw mm7, fix_184 ;MULTIPLY(z10,(FIX_1_847759065 - FIX_2_613125930)) //+ z5; /* -2*(c2+c6) */
psllw mm6, 2
movq mm1, [ebx + 8*4] ;load inptr[DCTSIZE*2]
pmullw mm1, [edi + 8*4] ;tmp1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
paddw mm0, mm5 ;tmp10
pmullw mm4, [edi + 8*12] ;tmp3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
paddw mm2, mm7 ;tmp12
pmulhw mm6, fix_141 ;tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); /* 2*c4 */
psubw mm2, mm3 ;tmp6 = tmp12 - tmp7
movq mm5, mm1 ;copy tmp1
paddw mm1, mm4 ;tmp13= tmp1 + tmp3; /* phases 5-3 */
psubw mm5, mm4 ;tmp1-tmp3
psubw mm6, mm2 ;tmp5 = tmp11 - tmp6;
movq [esi+8*0], mm1 ;save tmp13 in workspace
psllw mm5, 2 ;shift tmp1-tmp3
movq mm7, [ebx + 8*0] ;load inptr[DCTSIZE*0]
pmulhw mm5, fix_141 ;MULTIPLY(tmp1 - tmp3, FIX_1_414213562)
paddw mm0, mm6 ;tmp4 = tmp10 + tmp5;
pmullw mm7, [edi + 8*0] ;tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
movq mm4, [ebx + 8*8] ;load inptr[DCTSIZE*4]
pmullw mm4, [edi + 8*8] ;tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
psubw mm5, mm1 ;tmp12 = MULTIPLY(tmp1 - tmp3, FIX_1_414213562) - tmp13; /* 2*c4 */
movq [esi+8*4], mm0 ;save tmp4 in workspace
movq mm1, mm7 ;copy tmp0 /* phase 3 */
movq [esi+8*2], mm5 ;save tmp12 in workspace
psubw mm1, mm4 ;tmp11 = tmp0 - tmp2;
paddw mm7, mm4 ;tmp10 = tmp0 + tmp2;
movq mm5, mm1 ;copy tmp11
paddw mm1, [esi+8*2] ;tmp1 = tmp11 + tmp12;
movq mm4, mm7 ;copy tmp10 /* phase 2 */
paddw mm7, [esi+8*0] ;tmp0 = tmp10 + tmp13;
psubw mm4, [esi+8*0] ;tmp3 = tmp10 - tmp13;
movq mm0, mm7 ;copy tmp0
psubw mm5, [esi+8*2] ;tmp2 = tmp11 - tmp12;
paddw mm7, mm3 ;wsptr[DCTSIZE*0] = (int) (tmp0 + tmp7);
psubw mm0, mm3 ;wsptr[DCTSIZE*7] = (int) (tmp0 - tmp7);
movq [esi + 8*0], mm7 ;wsptr[DCTSIZE*0]
movq mm3, mm1 ;copy tmp1
movq [esi + 8*14], mm0 ;wsptr[DCTSIZE*7]
paddw mm1, mm2 ;wsptr[DCTSIZE*1] = (int) (tmp1 + tmp6);
psubw mm3, mm2 ;wsptr[DCTSIZE*6] = (int) (tmp1 - tmp6);
movq [esi + 8*2], mm1 ;wsptr[DCTSIZE*1]
movq mm1, mm4 ;copy tmp3
movq [esi + 8*12], mm3 ;wsptr[DCTSIZE*6]
paddw mm4, [esi+8*4] ;wsptr[DCTSIZE*4] = (int) (tmp3 + tmp4);
psubw mm1, [esi+8*4] ;wsptr[DCTSIZE*3] = (int) (tmp3 - tmp4);
movq [esi + 8*8], mm4
movq mm7, mm5 ;copy tmp2
paddw mm5, mm6 ;wsptr[DCTSIZE*2] = (int) (tmp2 + tmp5)
movq [esi+8*6], mm1 ;
psubw mm7, mm6 ;wsptr[DCTSIZE*5] = (int) (tmp2 - tmp5);
movq [esi + 8*4], mm5
movq [esi + 8*10], mm7
/*****************************************************************/
add edi, 8
add ebx, 8
add esi, 8
/*****************************************************************/
movq mm1, [ebx + 8*10] ;load inptr[DCTSIZE*5]
pmullw mm1, [edi + 8*10] ;tmp6 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
movq mm0, [ebx + 8*6] ;load inptr[DCTSIZE*3]
pmullw mm0, [edi + 8*6] ;tmp5 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
movq mm3, [ebx + 8*2] ;load inptr[DCTSIZE*1]
movq mm2, mm1 ;copy tmp6 /* phase 6 */
pmullw mm3, [edi + 8*2] ;tmp4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
movq mm4, [ebx + 8*14] ;load inptr[DCTSIZE*1]
paddw mm1, mm0 ;z13 = tmp6 + tmp5;
pmullw mm4, [edi + 8*14] ;tmp7 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
psubw mm2, mm0 ;z10 = tmp6 - tmp5
psllw mm2, 2 ;shift z10
movq mm0, mm2 ;copy z10
pmulhw mm2, fix_184n261 ;MULTIPLY( z12, FIX_1_847759065); /* 2*c2 */
movq mm5, mm3 ;copy tmp4
pmulhw mm0, fix_n184 ;MULTIPLY(z10, -FIX_1_847759065); /* 2*c2 */
paddw mm3, mm4 ;z11 = tmp4 + tmp7;
movq mm6, mm3 ;copy z11 /* phase 5 */
psubw mm5, mm4 ;z12 = tmp4 - tmp7;
psubw mm6, mm1 ;z11-z13
psllw mm5, 2 ;shift z12
movq mm4, [ebx + 8*12] ;load inptr[DCTSIZE*6], even part
movq mm7, mm5 ;copy z12
pmulhw mm5, fix_108n184 ;MULT(z12, (FIX_1_08-FIX_1_84)) //- z5; /* 2*(c2-c6) */ even part
paddw mm3, mm1 ;tmp7 = z11 + z13;
/* Even part */
pmulhw mm7, fix_184 ;MULTIPLY(z10,(FIX_1_847759065 - FIX_2_613125930)) //+ z5; /* -2*(c2+c6) */
psllw mm6, 2
movq mm1, [ebx + 8*4] ;load inptr[DCTSIZE*2]
pmullw mm1, [edi + 8*4] ;tmp1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
paddw mm0, mm5 ;tmp10
pmullw mm4, [edi + 8*12] ;tmp3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
paddw mm2, mm7 ;tmp12
pmulhw mm6, fix_141 ;tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); /* 2*c4 */
psubw mm2, mm3 ;tmp6 = tmp12 - tmp7
movq mm5, mm1 ;copy tmp1
paddw mm1, mm4 ;tmp13= tmp1 + tmp3; /* phases 5-3 */
psubw mm5, mm4 ;tmp1-tmp3
psubw mm6, mm2 ;tmp5 = tmp11 - tmp6;
movq [esi+8*0], mm1 ;save tmp13 in workspace
psllw mm5, 2 ;shift tmp1-tmp3
movq mm7, [ebx + 8*0] ;load inptr[DCTSIZE*0]
paddw mm0, mm6 ;tmp4 = tmp10 + tmp5;
pmulhw mm5, fix_141 ;MULTIPLY(tmp1 - tmp3, FIX_1_414213562)
pmullw mm7, [edi + 8*0] ;tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
movq mm4, [ebx + 8*8] ;load inptr[DCTSIZE*4]
pmullw mm4, [edi + 8*8] ;tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
psubw mm5, mm1 ;tmp12 = MULTIPLY(tmp1 - tmp3, FIX_1_414213562) - tmp13; /* 2*c4 */
movq [esi+8*4], mm0 ;save tmp4 in workspace
movq mm1, mm7 ;copy tmp0 /* phase 3 */
movq [esi+8*2], mm5 ;save tmp12 in workspace
psubw mm1, mm4 ;tmp11 = tmp0 - tmp2;
paddw mm7, mm4 ;tmp10 = tmp0 + tmp2;
movq mm5, mm1 ;copy tmp11
paddw mm1, [esi+8*2] ;tmp1 = tmp11 + tmp12;
movq mm4, mm7 ;copy tmp10 /* phase 2 */
paddw mm7, [esi+8*0] ;tmp0 = tmp10 + tmp13;
psubw mm4, [esi+8*0] ;tmp3 = tmp10 - tmp13;
movq mm0, mm7 ;copy tmp0
psubw mm5, [esi+8*2] ;tmp2 = tmp11 - tmp12;
paddw mm7, mm3 ;wsptr[DCTSIZE*0] = (int) (tmp0 + tmp7);
psubw mm0, mm3 ;wsptr[DCTSIZE*7] = (int) (tmp0 - tmp7);
movq [esi + 8*0], mm7 ;wsptr[DCTSIZE*0]
movq mm3, mm1 ;copy tmp1
movq [esi + 8*14], mm0 ;wsptr[DCTSIZE*7]
paddw mm1, mm2 ;wsptr[DCTSIZE*1] = (int) (tmp1 + tmp6);
psubw mm3, mm2 ;wsptr[DCTSIZE*6] = (int) (tmp1 - tmp6);
movq [esi + 8*2], mm1 ;wsptr[DCTSIZE*1]
movq mm1, mm4 ;copy tmp3
movq [esi + 8*12], mm3 ;wsptr[DCTSIZE*6]
paddw mm4, [esi+8*4] ;wsptr[DCTSIZE*4] = (int) (tmp3 + tmp4);
psubw mm1, [esi+8*4] ;wsptr[DCTSIZE*3] = (int) (tmp3 - tmp4);
movq [esi + 8*8], mm4
movq mm7, mm5 ;copy tmp2
paddw mm5, mm6 ;wsptr[DCTSIZE*2] = (int) (tmp2 + tmp5)
movq [esi+8*6], mm1 ;
psubw mm7, mm6 ;wsptr[DCTSIZE*5] = (int) (tmp2 - tmp5);
movq [esi + 8*4], mm5
movq [esi + 8*10], mm7
/*****************************************************************/
/* Pass 2: process rows from work array, store into output array. */
/* Note that we must descale the results by a factor of 8 == 2**3, */
/* and also undo the PASS1_BITS scaling. */
/*****************************************************************/
/* Even part */
mov esi, eax
mov eax, outptr
// tmp10 = ((DCTELEM) wsptr[0] + (DCTELEM) wsptr[4]);
// tmp13 = ((DCTELEM) wsptr[2] + (DCTELEM) wsptr[6]);
// tmp11 = ((DCTELEM) wsptr[0] - (DCTELEM) wsptr[4]);
// tmp14 = ((DCTELEM) wsptr[2] - (DCTELEM) wsptr[6]);
movq mm0, [esi+8*0] ;wsptr[0,0],[0,1],[0,2],[0,3]
movq mm1, [esi+8*1] ;wsptr[0,4],[0,5],[0,6],[0,7]
movq mm2, mm0
movq mm3, [esi+8*2] ;wsptr[1,0],[1,1],[1,2],[1,3]
paddw mm0, mm1 ;wsptr[0,tmp10],[xxx],[0,tmp13],[xxx]
movq mm4, [esi+8*3] ;wsptr[1,4],[1,5],[1,6],[1,7]
psubw mm2, mm1 ;wsptr[0,tmp11],[xxx],[0,tmp14],[xxx]
movq mm6, mm0
movq mm5, mm3
paddw mm3, mm4 ;wsptr[1,tmp10],[xxx],[1,tmp13],[xxx]
movq mm1, mm2
psubw mm5, mm4 ;wsptr[1,tmp11],[xxx],[1,tmp14],[xxx]
punpcklwd mm0, mm3 ;wsptr[0,tmp10],[1,tmp10],[xxx],[xxx]
movq mm7, [esi+8*7] ;wsptr[3,4],[3,5],[3,6],[3,7]
punpckhwd mm6, mm3 ;wsptr[0,tmp13],[1,tmp13],[xxx],[xxx]
movq mm3, [esi+8*4] ;wsptr[2,0],[2,1],[2,2],[2,3]
punpckldq mm0, mm6 ;wsptr[0,tmp10],[1,tmp10],[0,tmp13],[1,tmp13]
punpcklwd mm1, mm5 ;wsptr[0,tmp11],[1,tmp11],[xxx],[xxx]
movq mm4, mm3
movq mm6, [esi+8*6] ;wsptr[3,0],[3,1],[3,2],[3,3]
punpckhwd mm2, mm5 ;wsptr[0,tmp14],[1,tmp14],[xxx],[xxx]
movq mm5, [esi+8*5] ;wsptr[2,4],[2,5],[2,6],[2,7]
punpckldq mm1, mm2 ;wsptr[0,tmp11],[1,tmp11],[0,tmp14],[1,tmp14]
paddw mm3, mm5 ;wsptr[2,tmp10],[xxx],[2,tmp13],[xxx]
movq mm2, mm6
psubw mm4, mm5 ;wsptr[2,tmp11],[xxx],[2,tmp14],[xxx]
paddw mm6, mm7 ;wsptr[3,tmp10],[xxx],[3,tmp13],[xxx]
movq mm5, mm3
punpcklwd mm3, mm6 ;wsptr[2,tmp10],[3,tmp10],[xxx],[xxx]
psubw mm2, mm7 ;wsptr[3,tmp11],[xxx],[3,tmp14],[xxx]
punpckhwd mm5, mm6 ;wsptr[2,tmp13],[3,tmp13],[xxx],[xxx]
movq mm7, mm4
punpckldq mm3, mm5 ;wsptr[2,tmp10],[3,tmp10],[2,tmp13],[3,tmp13]
punpcklwd mm4, mm2 ;wsptr[2,tmp11],[3,tmp11],[xxx],[xxx]
punpckhwd mm7, mm2 ;wsptr[2,tmp14],[3,tmp14],[xxx],[xxx]
punpckldq mm4, mm7 ;wsptr[2,tmp11],[3,tmp11],[2,tmp14],[3,tmp14]
movq mm6, mm1
// mm0 = ;wsptr[0,tmp10],[1,tmp10],[0,tmp13],[1,tmp13]
// mm1 = ;wsptr[0,tmp11],[1,tmp11],[0,tmp14],[1,tmp14]
movq mm2, mm0
punpckhdq mm6, mm4 ;wsptr[0,tmp14],[1,tmp14],[2,tmp14],[3,tmp14]
punpckldq mm1, mm4 ;wsptr[0,tmp11],[1,tmp11],[2,tmp11],[3,tmp11]
psllw mm6, 2
pmulhw mm6, fix_141
punpckldq mm0, mm3 ;wsptr[0,tmp10],[1,tmp10],[2,tmp10],[3,tmp10]
punpckhdq mm2, mm3 ;wsptr[0,tmp13],[1,tmp13],[2,tmp13],[3,tmp13]
movq mm7, mm0
// tmp0 = tmp10 + tmp13;
// tmp3 = tmp10 - tmp13;
paddw mm0, mm2 ;[0,tmp0],[1,tmp0],[2,tmp0],[3,tmp0]
psubw mm7, mm2 ;[0,tmp3],[1,tmp3],[2,tmp3],[3,tmp3]
// tmp12 = MULTIPLY(tmp14, FIX_1_414213562) - tmp13;
psubw mm6, mm2 ;wsptr[0,tmp12],[1,tmp12],[2,tmp12],[3,tmp12]
// tmp1 = tmp11 + tmp12;
// tmp2 = tmp11 - tmp12;
movq mm5, mm1
/* Odd part */
// z13 = (DCTELEM) wsptr[5] + (DCTELEM) wsptr[3];
// z10 = (DCTELEM) wsptr[5] - (DCTELEM) wsptr[3];
// z11 = (DCTELEM) wsptr[1] + (DCTELEM) wsptr[7];
// z12 = (DCTELEM) wsptr[1] - (DCTELEM) wsptr[7];
movq mm3, [esi+8*0] ;wsptr[0,0],[0,1],[0,2],[0,3]
paddw mm1, mm6 ;[0,tmp1],[1,tmp1],[2,tmp1],[3,tmp1]
movq mm4, [esi+8*1] ;wsptr[0,4],[0,5],[0,6],[0,7]
psubw mm5, mm6 ;[0,tmp2],[1,tmp2],[2,tmp2],[3,tmp2]
movq mm6, mm3
punpckldq mm3, mm4 ;wsptr[0,0],[0,1],[0,4],[0,5]
punpckhdq mm4, mm6 ;wsptr[0,6],[0,7],[0,2],[0,3]
movq mm2, mm3
//Save tmp0 and tmp1 in wsptr
movq [esi+8*0], mm0 ;save tmp0
paddw mm2, mm4 ;wsptr[xxx],[0,z11],[xxx],[0,z13]
//Continue with z10 --- z13
movq mm6, [esi+8*2] ;wsptr[1,0],[1,1],[1,2],[1,3]
psubw mm3, mm4 ;wsptr[xxx],[0,z12],[xxx],[0,z10]
movq mm0, [esi+8*3] ;wsptr[1,4],[1,5],[1,6],[1,7]
movq mm4, mm6
movq [esi+8*1], mm1 ;save tmp1
punpckldq mm6, mm0 ;wsptr[1,0],[1,1],[1,4],[1,5]
punpckhdq mm0, mm4 ;wsptr[1,6],[1,7],[1,2],[1,3]
movq mm1, mm6
//Save tmp2 and tmp3 in wsptr
paddw mm6, mm0 ;wsptr[xxx],[1,z11],[xxx],[1,z13]
movq mm4, mm2
//Continue with z10 --- z13
movq [esi+8*2], mm5 ;save tmp2
punpcklwd mm2, mm6 ;wsptr[xxx],[xxx],[0,z11],[1,z11]
psubw mm1, mm0 ;wsptr[xxx],[1,z12],[xxx],[1,z10]
punpckhwd mm4, mm6 ;wsptr[xxx],[xxx],[0,z13],[1,z13]
movq mm0, mm3
punpcklwd mm3, mm1 ;wsptr[xxx],[xxx],[0,z12],[1,z12]
movq [esi+8*3], mm7 ;save tmp3
punpckhwd mm0, mm1 ;wsptr[xxx],[xxx],[0,z10],[1,z10]
movq mm6, [esi+8*4] ;wsptr[2,0],[2,1],[2,2],[2,3]
punpckhdq mm0, mm2 ;wsptr[0,z10],[1,z10],[0,z11],[1,z11]
movq mm7, [esi+8*5] ;wsptr[2,4],[2,5],[2,6],[2,7]
punpckhdq mm3, mm4 ;wsptr[0,z12],[1,z12],[0,z13],[1,z13]
movq mm1, [esi+8*6] ;wsptr[3,0],[3,1],[3,2],[3,3]
movq mm4, mm6
punpckldq mm6, mm7 ;wsptr[2,0],[2,1],[2,4],[2,5]
movq mm5, mm1
punpckhdq mm7, mm4 ;wsptr[2,6],[2,7],[2,2],[2,3]
movq mm2, mm6
movq mm4, [esi+8*7] ;wsptr[3,4],[3,5],[3,6],[3,7]
paddw mm6, mm7 ;wsptr[xxx],[2,z11],[xxx],[2,z13]
psubw mm2, mm7 ;wsptr[xxx],[2,z12],[xxx],[2,z10]
punpckldq mm1, mm4 ;wsptr[3,0],[3,1],[3,4],[3,5]
punpckhdq mm4, mm5 ;wsptr[3,6],[3,7],[3,2],[3,3]
movq mm7, mm1
paddw mm1, mm4 ;wsptr[xxx],[3,z11],[xxx],[3,z13]
psubw mm7, mm4 ;wsptr[xxx],[3,z12],[xxx],[3,z10]
movq mm5, mm6
punpcklwd mm6, mm1 ;wsptr[xxx],[xxx],[2,z11],[3,z11]
punpckhwd mm5, mm1 ;wsptr[xxx],[xxx],[2,z13],[3,z13]
movq mm4, mm2
punpcklwd mm2, mm7 ;wsptr[xxx],[xxx],[2,z12],[3,z12]
punpckhwd mm4, mm7 ;wsptr[xxx],[xxx],[2,z10],[3,z10]
punpckhdq mm4, mm6 ;wsptr[2,z10],[3,z10],[2,z11],[3,z11]
punpckhdq mm2, mm5 ;wsptr[2,z12],[3,z12],[2,z13],[3,z13]
movq mm5, mm0
punpckldq mm0, mm4 ;wsptr[0,z10],[1,z10],[2,z10],[3,z10]
punpckhdq mm5, mm4 ;wsptr[0,z11],[1,z11],[2,z11],[3,z11]
movq mm4, mm3
punpckhdq mm4, mm2 ;wsptr[0,z13],[1,z13],[2,z13],[3,z13]
movq mm1, mm5
punpckldq mm3, mm2 ;wsptr[0,z12],[1,z12],[2,z12],[3,z12]
// tmp7 = z11 + z13; /* phase 5 */
// tmp8 = z11 - z13; /* phase 5 */
psubw mm1, mm4 ;tmp8
paddw mm5, mm4 ;tmp7
// tmp21 = MULTIPLY(tmp8, FIX_1_414213562); /* 2*c4 */
psllw mm1, 2
psllw mm0, 2
pmulhw mm1, fix_141 ;tmp21
// tmp20 = MULTIPLY(z12, (FIX_1_082392200- FIX_1_847759065)) /* 2*(c2-c6) */
// + MULTIPLY(z10, - FIX_1_847759065); /* 2*c2 */
psllw mm3, 2
movq mm7, mm0
pmulhw mm7, fix_n184
movq mm6, mm3
movq mm2, [esi+8*0] ;tmp0,final1
pmulhw mm6, fix_108n184
// tmp22 = MULTIPLY(z10,(FIX_1_847759065 - FIX_2_613125930)) /* -2*(c2+c6) */
// + MULTIPLY(z12, FIX_1_847759065); /* 2*c2 */
movq mm4, mm2 ;final1
pmulhw mm0, fix_184n261
paddw mm2, mm5 ;tmp0+tmp7,final1
pmulhw mm3, fix_184
psubw mm4, mm5 ;tmp0-tmp7,final1
// tmp6 = tmp22 - tmp7; /* phase 2 */
psraw mm2, 5 ;outptr[0,0],[1,0],[2,0],[3,0],final1
paddsw mm2, const_0x0080 ;final1
paddw mm7, mm6 ;tmp20
psraw mm4, 5 ;outptr[0,7],[1,7],[2,7],[3,7],final1
paddsw mm4, const_0x0080 ;final1
paddw mm3, mm0 ;tmp22
// tmp5 = tmp21 - tmp6;
psubw mm3, mm5 ;tmp6
// tmp4 = tmp20 + tmp5;
movq mm0, [esi+8*1] ;tmp1,final2
psubw mm1, mm3 ;tmp5
movq mm6, mm0 ;final2
paddw mm0, mm3 ;tmp1+tmp6,final2
/* Final output stage: scale down by a factor of 8 and range-limit */
// outptr[0] = range_limit[IDESCALE(tmp0 + tmp7, PASS1_BITS+3)
// & RANGE_MASK];
// outptr[7] = range_limit[IDESCALE(tmp0 - tmp7, PASS1_BITS+3)
// & RANGE_MASK]; final1
// outptr[1] = range_limit[IDESCALE(tmp1 + tmp6, PASS1_BITS+3)
// & RANGE_MASK];
// outptr[6] = range_limit[IDESCALE(tmp1 - tmp6, PASS1_BITS+3)
// & RANGE_MASK]; final2
psubw mm6, mm3 ;tmp1-tmp6,final2
psraw mm0, 5 ;outptr[0,1],[1,1],[2,1],[3,1]
paddsw mm0, const_0x0080
psraw mm6, 5 ;outptr[0,6],[1,6],[2,6],[3,6]
paddsw mm6, const_0x0080 ;need to check this value
packuswb mm0, mm4 ;out[0,1],[1,1],[2,1],[3,1],[0,7],[1,7],[2,7],[3,7]
movq mm5, [esi+8*2] ;tmp2,final3
packuswb mm2, mm6 ;out[0,0],[1,0],[2,0],[3,0],[0,6],[1,6],[2,6],[3,6]
// outptr[2] = range_limit[IDESCALE(tmp2 + tmp5, PASS1_BITS+3)
// & RANGE_MASK];
// outptr[5] = range_limit[IDESCALE(tmp2 - tmp5, PASS1_BITS+3)
// & RANGE_MASK]; final3
paddw mm7, mm1 ;tmp4
movq mm3, mm5
paddw mm5, mm1 ;tmp2+tmp5
psubw mm3, mm1 ;tmp2-tmp5
psraw mm5, 5 ;outptr[0,2],[1,2],[2,2],[3,2]
paddsw mm5, const_0x0080
movq mm4, [esi+8*3] ;tmp3,final4
psraw mm3, 5 ;outptr[0,5],[1,5],[2,5],[3,5]
paddsw mm3, const_0x0080
// outptr[4] = range_limit[IDESCALE(tmp3 + tmp4, PASS1_BITS+3)
// & RANGE_MASK];
// outptr[3] = range_limit[IDESCALE(tmp3 - tmp4, PASS1_BITS+3)
// & RANGE_MASK]; final4
movq mm6, mm4
paddw mm4, mm7 ;tmp3+tmp4
psubw mm6, mm7 ;tmp3-tmp4
psraw mm4, 5 ;outptr[0,4],[1,4],[2,4],[3,4]
mov ecx, [eax]
paddsw mm4, const_0x0080
psraw mm6, 5 ;outptr[0,3],[1,3],[2,3],[3,3]
paddsw mm6, const_0x0080
packuswb mm5, mm4 ;out[0,2],[1,2],[2,2],[3,2],[0,4],[1,4],[2,4],[3,4]
packuswb mm6, mm3 ;out[0,3],[1,3],[2,3],[3,3],[0,5],[1,5],[2,5],[3,5]
movq mm4, mm2
movq mm7, mm5
punpcklbw mm2, mm0 ;out[0,0],[0,1],[1,0],[1,1],[2,0],[2,1],[3,0],[3,1]
punpckhbw mm4, mm0 ;out[0,6],[0,7],[1,6],[1,7],[2,6],[2,7],[3,6],[3,7]
movq mm1, mm2
punpcklbw mm5, mm6 ;out[0,2],[0,3],[1,2],[1,3],[2,2],[2,3],[3,2],[3,3]
add eax, 4
punpckhbw mm7, mm6 ;out[0,4],[0,5],[1,4],[1,5],[2,4],[2,5],[3,4],[3,5]
punpcklwd mm2, mm5 ;out[0,0],[0,1],[0,2],[0,3],[1,0],[1,1],[1,2],[1,3]
add ecx, output_col
movq mm6, mm7
punpckhwd mm1, mm5 ;out[2,0],[2,1],[2,2],[2,3],[3,0],[3,1],[3,2],[3,3]
movq mm0, mm2
punpcklwd mm6, mm4 ;out[0,4],[0,5],[0,6],[0,7],[1,4],[1,5],[1,6],[1,7]
mov ebx, [eax]
punpckldq mm2, mm6 ;out[0,0],[0,1],[0,2],[0,3],[0,4],[0,5],[0,6],[0,7]
add eax, 4
movq mm3, mm1
add ebx, output_col
punpckhwd mm7, mm4 ;out[2,4],[2,5],[2,6],[2,7],[3,4],[3,5],[3,6],[3,7]
movq [ecx], mm2
punpckhdq mm0, mm6 ;out[1,0],[1,1],[1,2],[1,3],[1,4],[1,5],[1,6],[1,7]
mov ecx, [eax]
add eax, 4
add ecx, output_col
movq [ebx], mm0
punpckldq mm1, mm7 ;out[2,0],[2,1],[2,2],[2,3],[2,4],[2,5],[2,6],[2,7]
mov ebx, [eax]
add ebx, output_col
punpckhdq mm3, mm7 ;out[3,0],[3,1],[3,2],[3,3],[3,4],[3,5],[3,6],[3,7]
movq [ecx], mm1
movq [ebx], mm3
/*******************************************************************/
add esi, 64
add eax, 4
/*******************************************************************/
// tmp10 = ((DCTELEM) wsptr[0] + (DCTELEM) wsptr[4]);
// tmp13 = ((DCTELEM) wsptr[2] + (DCTELEM) wsptr[6]);
// tmp11 = ((DCTELEM) wsptr[0] - (DCTELEM) wsptr[4]);
// tmp14 = ((DCTELEM) wsptr[2] - (DCTELEM) wsptr[6]);
movq mm0, [esi+8*0] ;wsptr[0,0],[0,1],[0,2],[0,3]
movq mm1, [esi+8*1] ;wsptr[0,4],[0,5],[0,6],[0,7]
movq mm2, mm0
movq mm3, [esi+8*2] ;wsptr[1,0],[1,1],[1,2],[1,3]
paddw mm0, mm1 ;wsptr[0,tmp10],[xxx],[0,tmp13],[xxx]
movq mm4, [esi+8*3] ;wsptr[1,4],[1,5],[1,6],[1,7]
psubw mm2, mm1 ;wsptr[0,tmp11],[xxx],[0,tmp14],[xxx]
movq mm6, mm0
movq mm5, mm3
paddw mm3, mm4 ;wsptr[1,tmp10],[xxx],[1,tmp13],[xxx]
movq mm1, mm2
psubw mm5, mm4 ;wsptr[1,tmp11],[xxx],[1,tmp14],[xxx]
punpcklwd mm0, mm3 ;wsptr[0,tmp10],[1,tmp10],[xxx],[xxx]
movq mm7, [esi+8*7] ;wsptr[3,4],[3,5],[3,6],[3,7]
punpckhwd mm6, mm3 ;wsptr[0,tmp13],[1,tmp13],[xxx],[xxx]
movq mm3, [esi+8*4] ;wsptr[2,0],[2,1],[2,2],[2,3]
punpckldq mm0, mm6 ;wsptr[0,tmp10],[1,tmp10],[0,tmp13],[1,tmp13]
punpcklwd mm1, mm5 ;wsptr[0,tmp11],[1,tmp11],[xxx],[xxx]
movq mm4, mm3
movq mm6, [esi+8*6] ;wsptr[3,0],[3,1],[3,2],[3,3]
punpckhwd mm2, mm5 ;wsptr[0,tmp14],[1,tmp14],[xxx],[xxx]
movq mm5, [esi+8*5] ;wsptr[2,4],[2,5],[2,6],[2,7]
punpckldq mm1, mm2 ;wsptr[0,tmp11],[1,tmp11],[0,tmp14],[1,tmp14]
paddw mm3, mm5 ;wsptr[2,tmp10],[xxx],[2,tmp13],[xxx]
movq mm2, mm6
psubw mm4, mm5 ;wsptr[2,tmp11],[xxx],[2,tmp14],[xxx]
paddw mm6, mm7 ;wsptr[3,tmp10],[xxx],[3,tmp13],[xxx]
movq mm5, mm3
punpcklwd mm3, mm6 ;wsptr[2,tmp10],[3,tmp10],[xxx],[xxx]
psubw mm2, mm7 ;wsptr[3,tmp11],[xxx],[3,tmp14],[xxx]
punpckhwd mm5, mm6 ;wsptr[2,tmp13],[3,tmp13],[xxx],[xxx]
movq mm7, mm4
punpckldq mm3, mm5 ;wsptr[2,tmp10],[3,tmp10],[2,tmp13],[3,tmp13]
punpcklwd mm4, mm2 ;wsptr[2,tmp11],[3,tmp11],[xxx],[xxx]
punpckhwd mm7, mm2 ;wsptr[2,tmp14],[3,tmp14],[xxx],[xxx]
punpckldq mm4, mm7 ;wsptr[2,tmp11],[3,tmp11],[2,tmp14],[3,tmp14]
movq mm6, mm1
// mm0 = ;wsptr[0,tmp10],[1,tmp10],[0,tmp13],[1,tmp13]
// mm1 = ;wsptr[0,tmp11],[1,tmp11],[0,tmp14],[1,tmp14]
movq mm2, mm0
punpckhdq mm6, mm4 ;wsptr[0,tmp14],[1,tmp14],[2,tmp14],[3,tmp14]
punpckldq mm1, mm4 ;wsptr[0,tmp11],[1,tmp11],[2,tmp11],[3,tmp11]
psllw mm6, 2
pmulhw mm6, fix_141
punpckldq mm0, mm3 ;wsptr[0,tmp10],[1,tmp10],[2,tmp10],[3,tmp10]
punpckhdq mm2, mm3 ;wsptr[0,tmp13],[1,tmp13],[2,tmp13],[3,tmp13]
movq mm7, mm0
// tmp0 = tmp10 + tmp13;
// tmp3 = tmp10 - tmp13;
paddw mm0, mm2 ;[0,tmp0],[1,tmp0],[2,tmp0],[3,tmp0]
psubw mm7, mm2 ;[0,tmp3],[1,tmp3],[2,tmp3],[3,tmp3]
// tmp12 = MULTIPLY(tmp14, FIX_1_414213562) - tmp13;
psubw mm6, mm2 ;wsptr[0,tmp12],[1,tmp12],[2,tmp12],[3,tmp12]
// tmp1 = tmp11 + tmp12;
// tmp2 = tmp11 - tmp12;
movq mm5, mm1
/* Odd part */
// z13 = (DCTELEM) wsptr[5] + (DCTELEM) wsptr[3];
// z10 = (DCTELEM) wsptr[5] - (DCTELEM) wsptr[3];
// z11 = (DCTELEM) wsptr[1] + (DCTELEM) wsptr[7];
// z12 = (DCTELEM) wsptr[1] - (DCTELEM) wsptr[7];
movq mm3, [esi+8*0] ;wsptr[0,0],[0,1],[0,2],[0,3]
paddw mm1, mm6 ;[0,tmp1],[1,tmp1],[2,tmp1],[3,tmp1]
movq mm4, [esi+8*1] ;wsptr[0,4],[0,5],[0,6],[0,7]
psubw mm5, mm6 ;[0,tmp2],[1,tmp2],[2,tmp2],[3,tmp2]
movq mm6, mm3
punpckldq mm3, mm4 ;wsptr[0,0],[0,1],[0,4],[0,5]
punpckhdq mm4, mm6 ;wsptr[0,6],[0,7],[0,2],[0,3]
movq mm2, mm3
//Save tmp0 and tmp1 in wsptr
movq [esi+8*0], mm0 ;save tmp0
paddw mm2, mm4 ;wsptr[xxx],[0,z11],[xxx],[0,z13]
//Continue with z10 --- z13
movq mm6, [esi+8*2] ;wsptr[1,0],[1,1],[1,2],[1,3]
psubw mm3, mm4 ;wsptr[xxx],[0,z12],[xxx],[0,z10]
movq mm0, [esi+8*3] ;wsptr[1,4],[1,5],[1,6],[1,7]
movq mm4, mm6
movq [esi+8*1], mm1 ;save tmp1
punpckldq mm6, mm0 ;wsptr[1,0],[1,1],[1,4],[1,5]
punpckhdq mm0, mm4 ;wsptr[1,6],[1,7],[1,2],[1,3]
movq mm1, mm6
//Save tmp2 and tmp3 in wsptr
paddw mm6, mm0 ;wsptr[xxx],[1,z11],[xxx],[1,z13]
movq mm4, mm2
//Continue with z10 --- z13
movq [esi+8*2], mm5 ;save tmp2
punpcklwd mm2, mm6 ;wsptr[xxx],[xxx],[0,z11],[1,z11]
psubw mm1, mm0 ;wsptr[xxx],[1,z12],[xxx],[1,z10]
punpckhwd mm4, mm6 ;wsptr[xxx],[xxx],[0,z13],[1,z13]
movq mm0, mm3
punpcklwd mm3, mm1 ;wsptr[xxx],[xxx],[0,z12],[1,z12]
movq [esi+8*3], mm7 ;save tmp3
punpckhwd mm0, mm1 ;wsptr[xxx],[xxx],[0,z10],[1,z10]
movq mm6, [esi+8*4] ;wsptr[2,0],[2,1],[2,2],[2,3]
punpckhdq mm0, mm2 ;wsptr[0,z10],[1,z10],[0,z11],[1,z11]
movq mm7, [esi+8*5] ;wsptr[2,4],[2,5],[2,6],[2,7]
punpckhdq mm3, mm4 ;wsptr[0,z12],[1,z12],[0,z13],[1,z13]
movq mm1, [esi+8*6] ;wsptr[3,0],[3,1],[3,2],[3,3]
movq mm4, mm6
punpckldq mm6, mm7 ;wsptr[2,0],[2,1],[2,4],[2,5]
movq mm5, mm1
punpckhdq mm7, mm4 ;wsptr[2,6],[2,7],[2,2],[2,3]
movq mm2, mm6
movq mm4, [esi+8*7] ;wsptr[3,4],[3,5],[3,6],[3,7]
paddw mm6, mm7 ;wsptr[xxx],[2,z11],[xxx],[2,z13]
psubw mm2, mm7 ;wsptr[xxx],[2,z12],[xxx],[2,z10]
punpckldq mm1, mm4 ;wsptr[3,0],[3,1],[3,4],[3,5]
punpckhdq mm4, mm5 ;wsptr[3,6],[3,7],[3,2],[3,3]
movq mm7, mm1
paddw mm1, mm4 ;wsptr[xxx],[3,z11],[xxx],[3,z13]
psubw mm7, mm4 ;wsptr[xxx],[3,z12],[xxx],[3,z10]
movq mm5, mm6
punpcklwd mm6, mm1 ;wsptr[xxx],[xxx],[2,z11],[3,z11]
punpckhwd mm5, mm1 ;wsptr[xxx],[xxx],[2,z13],[3,z13]
movq mm4, mm2
punpcklwd mm2, mm7 ;wsptr[xxx],[xxx],[2,z12],[3,z12]
punpckhwd mm4, mm7 ;wsptr[xxx],[xxx],[2,z10],[3,z10]
punpckhdq mm4, mm6 ;wsptr[2,z10],[3,z10],[2,z11],[3,z11]
punpckhdq mm2, mm5 ;wsptr[2,z12],[3,z12],[2,z13],[3,z13]
movq mm5, mm0
punpckldq mm0, mm4 ;wsptr[0,z10],[1,z10],[2,z10],[3,z10]
punpckhdq mm5, mm4 ;wsptr[0,z11],[1,z11],[2,z11],[3,z11]
movq mm4, mm3
punpckhdq mm4, mm2 ;wsptr[0,z13],[1,z13],[2,z13],[3,z13]
movq mm1, mm5
punpckldq mm3, mm2 ;wsptr[0,z12],[1,z12],[2,z12],[3,z12]
// tmp7 = z11 + z13; /* phase 5 */
// tmp8 = z11 - z13; /* phase 5 */
psubw mm1, mm4 ;tmp8
paddw mm5, mm4 ;tmp7
// tmp21 = MULTIPLY(tmp8, FIX_1_414213562); /* 2*c4 */
psllw mm1, 2
psllw mm0, 2
pmulhw mm1, fix_141 ;tmp21
// tmp20 = MULTIPLY(z12, (FIX_1_082392200- FIX_1_847759065)) /* 2*(c2-c6) */
// + MULTIPLY(z10, - FIX_1_847759065); /* 2*c2 */
psllw mm3, 2
movq mm7, mm0
pmulhw mm7, fix_n184
movq mm6, mm3
movq mm2, [esi+8*0] ;tmp0,final1
pmulhw mm6, fix_108n184
// tmp22 = MULTIPLY(z10,(FIX_1_847759065 - FIX_2_613125930)) /* -2*(c2+c6) */
// + MULTIPLY(z12, FIX_1_847759065); /* 2*c2 */
movq mm4, mm2 ;final1
pmulhw mm0, fix_184n261
paddw mm2, mm5 ;tmp0+tmp7,final1
pmulhw mm3, fix_184
psubw mm4, mm5 ;tmp0-tmp7,final1
// tmp6 = tmp22 - tmp7; /* phase 2 */
psraw mm2, 5 ;outptr[0,0],[1,0],[2,0],[3,0],final1
paddsw mm2, const_0x0080 ;final1
paddw mm7, mm6 ;tmp20
psraw mm4, 5 ;outptr[0,7],[1,7],[2,7],[3,7],final1
paddsw mm4, const_0x0080 ;final1
paddw mm3, mm0 ;tmp22
// tmp5 = tmp21 - tmp6;
psubw mm3, mm5 ;tmp6
// tmp4 = tmp20 + tmp5;
movq mm0, [esi+8*1] ;tmp1,final2
psubw mm1, mm3 ;tmp5
movq mm6, mm0 ;final2
paddw mm0, mm3 ;tmp1+tmp6,final2
/* Final output stage: scale down by a factor of 8 and range-limit */
// outptr[0] = range_limit[IDESCALE(tmp0 + tmp7, PASS1_BITS+3)
// & RANGE_MASK];
// outptr[7] = range_limit[IDESCALE(tmp0 - tmp7, PASS1_BITS+3)
// & RANGE_MASK]; final1
// outptr[1] = range_limit[IDESCALE(tmp1 + tmp6, PASS1_BITS+3)
// & RANGE_MASK];
// outptr[6] = range_limit[IDESCALE(tmp1 - tmp6, PASS1_BITS+3)
// & RANGE_MASK]; final2
psubw mm6, mm3 ;tmp1-tmp6,final2
psraw mm0, 5 ;outptr[0,1],[1,1],[2,1],[3,1]
paddsw mm0, const_0x0080
psraw mm6, 5 ;outptr[0,6],[1,6],[2,6],[3,6]
paddsw mm6, const_0x0080 ;need to check this value
packuswb mm0, mm4 ;out[0,1],[1,1],[2,1],[3,1],[0,7],[1,7],[2,7],[3,7]
movq mm5, [esi+8*2] ;tmp2,final3
packuswb mm2, mm6 ;out[0,0],[1,0],[2,0],[3,0],[0,6],[1,6],[2,6],[3,6]
// outptr[2] = range_limit[IDESCALE(tmp2 + tmp5, PASS1_BITS+3)
// & RANGE_MASK];
// outptr[5] = range_limit[IDESCALE(tmp2 - tmp5, PASS1_BITS+3)
// & RANGE_MASK]; final3
paddw mm7, mm1 ;tmp4
movq mm3, mm5
paddw mm5, mm1 ;tmp2+tmp5
psubw mm3, mm1 ;tmp2-tmp5
psraw mm5, 5 ;outptr[0,2],[1,2],[2,2],[3,2]
paddsw mm5, const_0x0080
movq mm4, [esi+8*3] ;tmp3,final4
psraw mm3, 5 ;outptr[0,5],[1,5],[2,5],[3,5]
paddsw mm3, const_0x0080
// outptr[4] = range_limit[IDESCALE(tmp3 + tmp4, PASS1_BITS+3)
// & RANGE_MASK];
// outptr[3] = range_limit[IDESCALE(tmp3 - tmp4, PASS1_BITS+3)
// & RANGE_MASK]; final4
movq mm6, mm4
paddw mm4, mm7 ;tmp3+tmp4
psubw mm6, mm7 ;tmp3-tmp4
psraw mm4, 5 ;outptr[0,4],[1,4],[2,4],[3,4]
mov ecx, [eax]
paddsw mm4, const_0x0080
psraw mm6, 5 ;outptr[0,3],[1,3],[2,3],[3,3]
paddsw mm6, const_0x0080
packuswb mm5, mm4 ;out[0,2],[1,2],[2,2],[3,2],[0,4],[1,4],[2,4],[3,4]
packuswb mm6, mm3 ;out[0,3],[1,3],[2,3],[3,3],[0,5],[1,5],[2,5],[3,5]
movq mm4, mm2
movq mm7, mm5
punpcklbw mm2, mm0 ;out[0,0],[0,1],[1,0],[1,1],[2,0],[2,1],[3,0],[3,1]
punpckhbw mm4, mm0 ;out[0,6],[0,7],[1,6],[1,7],[2,6],[2,7],[3,6],[3,7]
movq mm1, mm2
punpcklbw mm5, mm6 ;out[0,2],[0,3],[1,2],[1,3],[2,2],[2,3],[3,2],[3,3]
add eax, 4
punpckhbw mm7, mm6 ;out[0,4],[0,5],[1,4],[1,5],[2,4],[2,5],[3,4],[3,5]
punpcklwd mm2, mm5 ;out[0,0],[0,1],[0,2],[0,3],[1,0],[1,1],[1,2],[1,3]
add ecx, output_col
movq mm6, mm7
punpckhwd mm1, mm5 ;out[2,0],[2,1],[2,2],[2,3],[3,0],[3,1],[3,2],[3,3]
movq mm0, mm2
punpcklwd mm6, mm4 ;out[0,4],[0,5],[0,6],[0,7],[1,4],[1,5],[1,6],[1,7]
mov ebx, [eax]
punpckldq mm2, mm6 ;out[0,0],[0,1],[0,2],[0,3],[0,4],[0,5],[0,6],[0,7]
add eax, 4
movq mm3, mm1
add ebx, output_col
punpckhwd mm7, mm4 ;out[2,4],[2,5],[2,6],[2,7],[3,4],[3,5],[3,6],[3,7]
movq [ecx], mm2
punpckhdq mm0, mm6 ;out[1,0],[1,1],[1,2],[1,3],[1,4],[1,5],[1,6],[1,7]
mov ecx, [eax]
add eax, 4
add ecx, output_col
movq [ebx], mm0
punpckldq mm1, mm7 ;out[2,0],[2,1],[2,2],[2,3],[2,4],[2,5],[2,6],[2,7]
mov ebx, [eax]
add ebx, output_col
punpckhdq mm3, mm7 ;out[3,0],[3,1],[3,2],[3,3],[3,4],[3,5],[3,6],[3,7]
movq [ecx], mm1
movq [ebx], mm3
}
}
fdct_ifast (DCTELEM * data)
{
int16_t tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
int16_t tmp10, tmp11, tmp12, tmp13;
int16_t z1, z2, z3, z4, z5, z11, z13;
DCTELEM *dataptr;
int ctr;
SHIFT_TEMPS
row_fdct(data);
/* Pass 2: process columns. */
dataptr = data;
for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7];
tmp7 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7];
tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6];
tmp6 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6];
tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5];
tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5];
tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4];
tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4];
/* Even part */
tmp10 = tmp0 + tmp3; /* phase 2 */
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
dataptr[DCTSIZE*0] = tmp10 + tmp11; /* phase 3 */
dataptr[DCTSIZE*4] = tmp10 - tmp11;
z1 = MULTIPLY(tmp12 + tmp13, FIX_0_707106781); /* c4 */
dataptr[DCTSIZE*2] = tmp13 + z1; /* phase 5 */
dataptr[DCTSIZE*6] = tmp13 - z1;
/* Odd part */
tmp10 = tmp4 + tmp5; /* phase 2 */
tmp11 = tmp5 + tmp6;
tmp12 = tmp6 + tmp7;
/* The rotator is modified from fig 4-8 to avoid extra negations. */
z5 = MULTIPLY(tmp10 - tmp12, FIX_0_382683433); /* c6 */
z2 = MULTIPLY(tmp10, FIX_0_541196100) + z5; /* c2-c6 */
z4 = MULTIPLY(tmp12, FIX_1_306562965) + z5; /* c2+c6 */
z3 = MULTIPLY(tmp11, FIX_0_707106781); /* c4 */
z11 = tmp7 + z3; /* phase 5 */
z13 = tmp7 - z3;
dataptr[DCTSIZE*5] = z13 + z2; /* phase 6 */
dataptr[DCTSIZE*3] = z13 - z2;
dataptr[DCTSIZE*1] = z11 + z4;
dataptr[DCTSIZE*7] = z11 - z4;
dataptr++; /* advance pointer to next column */
}
}
jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
INT32 tmp0, tmp10, z1;
JCOEFPTR inptr;
ISLOW_MULT_TYPE * quantptr;
int * wsptr;
JSAMPROW outptr;
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
int ctr;
int workspace[DCTSIZE*2]; /* buffers data between passes */
SHIFT_TEMPS
/* Pass 1: process columns from input, store into work array. */
inptr = coef_block;
quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table;
wsptr = workspace;
for (ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr--) {
/* Don't bother to process columns 2,4,6 */
if (ctr == DCTSIZE-2 || ctr == DCTSIZE-4 || ctr == DCTSIZE-6)
continue;
if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*3] == 0 &&
inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*7] == 0) {
/* AC terms all zero; we need not examine terms 2,4,6 for 2x2 output */
int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;
wsptr[DCTSIZE*0] = dcval;
wsptr[DCTSIZE*1] = dcval;
continue;
}
/* Even part */
z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
tmp10 = z1 << (CONST_BITS+2);
/* Odd part */
z1 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
tmp0 = MULTIPLY(z1, - FIX_0_720959822); /* sqrt(2) * (c7-c5+c3-c1) */
z1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
tmp0 += MULTIPLY(z1, FIX_0_850430095); /* sqrt(2) * (-c1+c3+c5+c7) */
z1 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
tmp0 += MULTIPLY(z1, - FIX_1_272758580); /* sqrt(2) * (-c1+c3-c5-c7) */
z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
tmp0 += MULTIPLY(z1, FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */
/* Final output stage */
wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp0, CONST_BITS-PASS1_BITS+2);
wsptr[DCTSIZE*1] = (int) DESCALE(tmp10 - tmp0, CONST_BITS-PASS1_BITS+2);
}
/* Pass 2: process 2 rows from work array, store into output array. */
wsptr = workspace;
for (ctr = 0; ctr < 2; ctr++) {
outptr = output_buf[ctr] + output_col;
/* It's not clear whether a zero row test is worthwhile here ... */
#ifndef NO_ZERO_ROW_TEST
if (wsptr[1] == 0 && wsptr[3] == 0 && wsptr[5] == 0 && wsptr[7] == 0) {
/* AC terms all zero */
JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3)
& RANGE_MASK];
outptr[0] = dcval;
outptr[1] = dcval;
wsptr += DCTSIZE; /* advance pointer to next row */
continue;
}
#endif
/* Even part */
tmp10 = ((INT32) wsptr[0]) << (CONST_BITS+2);
/* Odd part */
tmp0 = MULTIPLY((INT32) wsptr[7], - FIX_0_720959822) /* sqrt(2) * (c7-c5+c3-c1) */
+ MULTIPLY((INT32) wsptr[5], FIX_0_850430095) /* sqrt(2) * (-c1+c3+c5+c7) */
+ MULTIPLY((INT32) wsptr[3], - FIX_1_272758580) /* sqrt(2) * (-c1+c3-c5-c7) */
+ MULTIPLY((INT32) wsptr[1], FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */
/* Final output stage */
outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp0,
CONST_BITS+PASS1_BITS+3+2)
& RANGE_MASK];
outptr[1] = range_limit[(int) DESCALE(tmp10 - tmp0,
CONST_BITS+PASS1_BITS+3+2)
& RANGE_MASK];
wsptr += DCTSIZE; /* advance pointer to next row */
}
}
void j_rev_dct(DCTBLOCK data)
{
int32 tmp0, tmp1, tmp2, tmp3;
int32 tmp10, tmp11, tmp12, tmp13;
int32 z1, z2, z3, z4, z5;
register DCTELEM *dataptr;
int rowctr;
/* Pass 1: process rows. */
/* Note results are scaled up by sqrt(8) compared to a true IDCT; */
/* furthermore, we scale the results by 2**PASS1_BITS. */
dataptr = data;
for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--)
{
/* Even part: reverse the even part of the forward DCT. */
/* The rotator is sqrt(2)*c(-6). */
z2 = (int32) dataptr[2];
z3 = (int32) dataptr[6];
z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065);
tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865);
tmp0 = ((uint32) dataptr[0] + (uint32) dataptr[4]) << CONST_BITS;
tmp1 = ((uint32) dataptr[0] - (uint32) dataptr[4]) << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
/* Odd part per figure 8; the matrix is unitary and hence its
* transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
*/
tmp0 = (int32) dataptr[7];
tmp1 = (int32) dataptr[5];
tmp2 = (int32) dataptr[3];
tmp3 = (int32) dataptr[1];
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;
/* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
dataptr[0] = (DCTELEM) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS);
dataptr[7] = (DCTELEM) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS);
dataptr[1] = (DCTELEM) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS);
dataptr[6] = (DCTELEM) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS);
dataptr[2] = (DCTELEM) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS);
dataptr[5] = (DCTELEM) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS);
dataptr[3] = (DCTELEM) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS);
dataptr[4] = (DCTELEM) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS);
dataptr += DCTSIZE; /* advance pointer to next row */
}
/* Pass 2: process columns. */
/* Note that we must descale the results by a factor of 8 == 2**3, */
/* and also undo the PASS1_BITS scaling. */
dataptr = data;
for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--) {
/* Even part: reverse the even part of the forward DCT. */
/* The rotator is sqrt(2)*c(-6). */
z2 = (int32) dataptr[DCTSIZE*2];
z3 = (int32) dataptr[DCTSIZE*6];
z1 = MULTIPLY(z2 + z3, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065);
tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865);
tmp0 = ((uint32) dataptr[DCTSIZE*0] + (uint32) dataptr[DCTSIZE*4]) << CONST_BITS;
tmp1 = ((uint32) dataptr[DCTSIZE*0] - (uint32) dataptr[DCTSIZE*4]) << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
/* Odd part per figure 8; the matrix is unitary and hence its
* transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
*/
tmp0 = (int32) dataptr[DCTSIZE*7];
tmp1 = (int32) dataptr[DCTSIZE*5];
tmp2 = (int32) dataptr[DCTSIZE*3];
tmp3 = (int32) dataptr[DCTSIZE*1];
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;
/* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
dataptr[DCTSIZE*0] = (DCTELEM) DESCALE(tmp10 + tmp3, CONST_BITS+PASS1_BITS+1);
dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp10 - tmp3, CONST_BITS+PASS1_BITS+1);
dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp11 + tmp2, CONST_BITS+PASS1_BITS+1);
dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(tmp11 - tmp2, CONST_BITS+PASS1_BITS+1);
dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(tmp12 + tmp1, CONST_BITS+PASS1_BITS+1);
dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp12 - tmp1, CONST_BITS+PASS1_BITS+1);
dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp13 + tmp0, CONST_BITS+PASS1_BITS+1);
dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(tmp13 - tmp0, CONST_BITS+PASS1_BITS+1);
dataptr++; /* advance pointer to next column */
}
}
jpeg_idct_ifast (j_decompress_ptr cinfo, jpeg_component_info * compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
DCTELEM tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
DCTELEM tmp10, tmp11, tmp12, tmp13;
DCTELEM z5, z10, z11, z12, z13;
JCOEFPTR inptr;
IFAST_MULT_TYPE * quantptr;
int * wsptr;
JSAMPROW outptr;
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
int ctr;
int workspace[DCTSIZE2]; /* buffers data between passes */
SHIFT_TEMPS /* for DESCALE */
ISHIFT_TEMPS /* for IDESCALE */
/* Pass 1: process columns from input, store into work array. */
inptr = coef_block;
quantptr = (IFAST_MULT_TYPE *) compptr->dct_table;
wsptr = workspace;
for (ctr = DCTSIZE; ctr > 0; ctr--) {
/* Due to quantization, we will usually find that many of the input
* coefficients are zero, especially the AC terms. We can exploit this
* by short-circuiting the IDCT calculation for any column in which all
* the AC terms are zero. In that case each output is equal to the
* DC coefficient (with scale factor as needed).
* With typical images and quantization tables, half or more of the
* column DCT calculations can be simplified this way.
*/
if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 &&
inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 &&
inptr[DCTSIZE*7] == 0) {
/* AC terms all zero */
int dcval = (int) DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
wsptr[DCTSIZE*0] = dcval;
wsptr[DCTSIZE*1] = dcval;
wsptr[DCTSIZE*2] = dcval;
wsptr[DCTSIZE*3] = dcval;
wsptr[DCTSIZE*4] = dcval;
wsptr[DCTSIZE*5] = dcval;
wsptr[DCTSIZE*6] = dcval;
wsptr[DCTSIZE*7] = dcval;
inptr++; /* advance pointers to next column */
quantptr++;
wsptr++;
continue;
}
/* Even part */
tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
tmp1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]);
tmp3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
tmp10 = tmp0 + tmp2; /* phase 3 */
tmp11 = tmp0 - tmp2;
tmp13 = tmp1 + tmp3; /* phases 5-3 */
tmp12 = MULTIPLY(tmp1 - tmp3, FIX_1_414213562) - tmp13; /* 2*c4 */
tmp0 = tmp10 + tmp13; /* phase 2 */
tmp3 = tmp10 - tmp13;
tmp1 = tmp11 + tmp12;
tmp2 = tmp11 - tmp12;
/* Odd part */
tmp4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
tmp5 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
tmp6 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
tmp7 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
z13 = tmp6 + tmp5; /* phase 6 */
z10 = tmp6 - tmp5;
z11 = tmp4 + tmp7;
z12 = tmp4 - tmp7;
tmp7 = z11 + z13; /* phase 5 */
tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); /* 2*c4 */
z5 = MULTIPLY(z10 + z12, FIX_1_847759065); /* 2*c2 */
tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; /* 2*(c2-c6) */
tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5; /* -2*(c2+c6) */
tmp6 = tmp12 - tmp7; /* phase 2 */
tmp5 = tmp11 - tmp6;
tmp4 = tmp10 + tmp5;
wsptr[DCTSIZE*0] = (int) (tmp0 + tmp7);
wsptr[DCTSIZE*7] = (int) (tmp0 - tmp7);
wsptr[DCTSIZE*1] = (int) (tmp1 + tmp6);
wsptr[DCTSIZE*6] = (int) (tmp1 - tmp6);
wsptr[DCTSIZE*2] = (int) (tmp2 + tmp5);
wsptr[DCTSIZE*5] = (int) (tmp2 - tmp5);
wsptr[DCTSIZE*4] = (int) (tmp3 + tmp4);
wsptr[DCTSIZE*3] = (int) (tmp3 - tmp4);
inptr++; /* advance pointers to next column */
quantptr++;
wsptr++;
}
/* Pass 2: process rows from work array, store into output array. */
/* Note that we must descale the results by a factor of 8 == 2**3, */
/* and also undo the PASS1_BITS scaling. */
wsptr = workspace;
for (ctr = 0; ctr < DCTSIZE; ctr++) {
outptr = output_buf[ctr] + output_col;
/* Rows of zeroes can be exploited in the same way as we did with columns.
* However, the column calculation has created many nonzero AC terms, so
* the simplification applies less often (typically 5% to 10% of the time).
* On machines with very fast multiplication, it's possible that the
* test takes more time than it's worth. In that case this section
* may be commented out.
*/
#ifndef NO_ZERO_ROW_TEST
if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 &&
wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) {
/* AC terms all zero */
JSAMPLE dcval = range_limit[IDESCALE(wsptr[0], PASS1_BITS+3)
& RANGE_MASK];
outptr[0] = dcval;
outptr[1] = dcval;
outptr[2] = dcval;
outptr[3] = dcval;
outptr[4] = dcval;
outptr[5] = dcval;
outptr[6] = dcval;
outptr[7] = dcval;
wsptr += DCTSIZE; /* advance pointer to next row */
continue;
}
#endif
/* Even part */
tmp10 = ((DCTELEM) wsptr[0] + (DCTELEM) wsptr[4]);
tmp11 = ((DCTELEM) wsptr[0] - (DCTELEM) wsptr[4]);
tmp13 = ((DCTELEM) wsptr[2] + (DCTELEM) wsptr[6]);
tmp12 = MULTIPLY((DCTELEM) wsptr[2] - (DCTELEM) wsptr[6], FIX_1_414213562)
- tmp13;
tmp0 = tmp10 + tmp13;
tmp3 = tmp10 - tmp13;
tmp1 = tmp11 + tmp12;
tmp2 = tmp11 - tmp12;
/* Odd part */
z13 = (DCTELEM) wsptr[5] + (DCTELEM) wsptr[3];
z10 = (DCTELEM) wsptr[5] - (DCTELEM) wsptr[3];
z11 = (DCTELEM) wsptr[1] + (DCTELEM) wsptr[7];
z12 = (DCTELEM) wsptr[1] - (DCTELEM) wsptr[7];
tmp7 = z11 + z13; /* phase 5 */
tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); /* 2*c4 */
z5 = MULTIPLY(z10 + z12, FIX_1_847759065); /* 2*c2 */
tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; /* 2*(c2-c6) */
tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5; /* -2*(c2+c6) */
tmp6 = tmp12 - tmp7; /* phase 2 */
tmp5 = tmp11 - tmp6;
tmp4 = tmp10 + tmp5;
/* Final output stage: scale down by a factor of 8 and range-limit */
outptr[0] = range_limit[IDESCALE(tmp0 + tmp7, PASS1_BITS+3)
& RANGE_MASK];
outptr[7] = range_limit[IDESCALE(tmp0 - tmp7, PASS1_BITS+3)
& RANGE_MASK];
outptr[1] = range_limit[IDESCALE(tmp1 + tmp6, PASS1_BITS+3)
& RANGE_MASK];
outptr[6] = range_limit[IDESCALE(tmp1 - tmp6, PASS1_BITS+3)
& RANGE_MASK];
outptr[2] = range_limit[IDESCALE(tmp2 + tmp5, PASS1_BITS+3)
& RANGE_MASK];
outptr[5] = range_limit[IDESCALE(tmp2 - tmp5, PASS1_BITS+3)
& RANGE_MASK];
outptr[4] = range_limit[IDESCALE(tmp3 + tmp4, PASS1_BITS+3)
& RANGE_MASK];
outptr[3] = range_limit[IDESCALE(tmp3 - tmp4, PASS1_BITS+3)
& RANGE_MASK];
wsptr += DCTSIZE; /* advance pointer to next row */
}
}
void JPEG_SWIDCT_2X2(int16 *coef_block, uint8 *output_buf, const int32 *quantptr)
{
int32 tmp0, tmp10, z1;
int16 *inptr;
int32 *wsptr;
uint8 *outptr;
int32 ctr;
int32 workspace[DCTSIZE*2]; /* buffers data between passes */
/* Pass 1: process columns from input, store into work array. */
inptr = coef_block;
wsptr = workspace;
for (ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr--)
{
/* Don't bother to process columns 2,4,6 */
if (ctr == DCTSIZE-2 || ctr == DCTSIZE-4 || ctr == DCTSIZE-6)
continue;
if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*3] == 0 &&
inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*7] == 0)
{
/* AC terms all zero; we need not examine terms 2,4,6 for 2x2 output */
int32 dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;
wsptr[DCTSIZE*0] = dcval;
wsptr[DCTSIZE*1] = dcval;
continue;
}
/* Even part */
z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
tmp10 = z1 << (CONST_BITS+2);
/* Odd part */
z1 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
tmp0 = MULTIPLY(z1, - FIX_0_720959822); /* sqrt(2) * (c7-c5+c3-c1) */
z1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
tmp0 += MULTIPLY(z1, FIX_0_850430095); /* sqrt(2) * (-c1+c3+c5+c7) */
z1 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
tmp0 += MULTIPLY(z1, - FIX_1_272758580); /* sqrt(2) * (-c1+c3-c5-c7) */
z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
tmp0 += MULTIPLY(z1, FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */
/* Final output stage */
wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp0, CONST_BITS-PASS1_BITS+2);
wsptr[DCTSIZE*1] = (int) DESCALE(tmp10 - tmp0, CONST_BITS-PASS1_BITS+2);
}
/* Pass 2: process 2 rows from work array, store into output array. */
wsptr = workspace;
for (ctr = 0; ctr < 2; ctr++)
{
outptr = output_buf + ctr * 2;
/* It's not clear whether a zero row test is worthwhile here ... */
if (wsptr[1] == 0 && wsptr[3] == 0 && wsptr[5] == 0 && wsptr[7] == 0)
{
/* AC terms all zero */
uint8 dcval = s_pClip_table[(int32) DESCALE((int32) wsptr[0], PASS1_BITS+3)+128];
outptr[0] = dcval;
outptr[1] = dcval;
wsptr += DCTSIZE; /* advance pointer to next row */
continue;
}
/* Even part */
tmp10 = ((int32) wsptr[0]) << (CONST_BITS+2);
/* Odd part */
tmp0 = MULTIPLY((int32) wsptr[7], - FIX_0_720959822) /* sqrt(2) * (c7-c5+c3-c1) */
+ MULTIPLY((int32) wsptr[5], FIX_0_850430095) /* sqrt(2) * (-c1+c3+c5+c7) */
+ MULTIPLY((int32) wsptr[3], - FIX_1_272758580) /* sqrt(2) * (-c1+c3-c5-c7) */
+ MULTIPLY((int32) wsptr[1], FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */
/* Final output stage */
outptr[0] = s_pClip_table[(int32) DESCALE(tmp10 + tmp0, CONST_BITS+PASS1_BITS+3+2)+128];
outptr[1] = s_pClip_table[(int32) DESCALE(tmp10 - tmp0, CONST_BITS+PASS1_BITS+3+2)+128];
wsptr += DCTSIZE; /* advance pointer to next row */
}
}
void JPEG_SWIDCT_4X4(int16 *coef_block, uint8 *output_buf, const int32 *quantptr)
{
int32 tmp0, tmp2, tmp10, tmp12;
int32 z1, z2, z3, z4;
int16 *inptr;
int32 * wsptr;
uint8 *outptr;
int32 ctr;
int32 workspace[DCTSIZE*4]; /* buffers data between passes */
/* Pass 1: process columns from input, store into work array. */
inptr = coef_block;
wsptr = workspace;
for (ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr--)
{
/* Don't bother to process column 4, because second pass won't use it */
if (ctr == DCTSIZE-4)
continue;
if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 &&
inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*5] == 0 &&
inptr[DCTSIZE*6] == 0 && inptr[DCTSIZE*7] == 0)
{
/* AC terms all zero; we need not examine term 4 for 4x4 output */
int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS;
wsptr[DCTSIZE*0] = dcval;
wsptr[DCTSIZE*1] = dcval;
wsptr[DCTSIZE*2] = dcval;
wsptr[DCTSIZE*3] = dcval;
continue;
}
/* Even part */
tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]);
tmp0 <<= (CONST_BITS+1);
z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]);
z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]);
tmp2 = MULTIPLY(z2, FIX_1_847759065) + MULTIPLY(z3, -FIX_0_765366865);
tmp10 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
/* Odd part */
z1 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]);
z2 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]);
z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]);
z4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]);
tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */
+ MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */
+ MULTIPLY(z3, - FIX_2_172734803) /* sqrt(2) * (-c1-c5) */
+ MULTIPLY(z4, FIX_1_061594337); /* sqrt(2) * (c5+c7) */
tmp2 = MULTIPLY(z1, - FIX_0_509795579) /* sqrt(2) * (c7-c5) */
+ MULTIPLY(z2, - FIX_0_601344887) /* sqrt(2) * (c5-c1) */
+ MULTIPLY(z3, FIX_0_899976223) /* sqrt(2) * (c3-c7) */
+ MULTIPLY(z4, FIX_2_562915447); /* sqrt(2) * (c1+c3) */
/* Final output stage */
wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp2, CONST_BITS-PASS1_BITS+1);
wsptr[DCTSIZE*3] = (int) DESCALE(tmp10 - tmp2, CONST_BITS-PASS1_BITS+1);
wsptr[DCTSIZE*1] = (int) DESCALE(tmp12 + tmp0, CONST_BITS-PASS1_BITS+1);
wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 - tmp0, CONST_BITS-PASS1_BITS+1);
}
/* Pass 2: process 4 rows from work array, store into output array. */
wsptr = workspace;
for (ctr = 0; ctr < 4; ctr++)
{
outptr = output_buf + ctr * 4;
/* It's not clear whether a zero row test is worthwhile here ... */
if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 &&
wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0)
{
/* AC terms all zero */
uint8 dcval = s_pClip_table[(int32)DESCALE((int32) wsptr[0], PASS1_BITS+3)+128];
outptr[0] = dcval;
outptr[1] = dcval;
outptr[2] = dcval;
outptr[3] = dcval;
wsptr += DCTSIZE; /* advance pointer to next row */
continue;
}
/* Even part */
tmp0 = ((int32) wsptr[0]) << (CONST_BITS+1);
tmp2 = MULTIPLY((int32) wsptr[2], FIX_1_847759065)
+ MULTIPLY((int32) wsptr[6], - FIX_0_765366865);
tmp10 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
/* Odd part */
z1 = (int32) wsptr[7];
z2 = (int32) wsptr[5];
z3 = (int32) wsptr[3];
z4 = (int32) wsptr[1];
tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */
+ MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */
+ MULTIPLY(z3, - FIX_2_172734803) /* sqrt(2) * (-c1-c5) */
+ MULTIPLY(z4, FIX_1_061594337); /* sqrt(2) * (c5+c7) */
tmp2 = MULTIPLY(z1, - FIX_0_509795579) /* sqrt(2) * (c7-c5) */
+ MULTIPLY(z2, - FIX_0_601344887) /* sqrt(2) * (c5-c1) */
+ MULTIPLY(z3, FIX_0_899976223) /* sqrt(2) * (c3-c7) */
+ MULTIPLY(z4, FIX_2_562915447); /* sqrt(2) * (c1+c3) */
/* Final output stage */
outptr[0] = s_pClip_table[(int32) DESCALE(tmp10 + tmp2, CONST_BITS+PASS1_BITS+3+1)+128];
outptr[3] = s_pClip_table[(int32) DESCALE(tmp10 - tmp2, CONST_BITS+PASS1_BITS+3+1)+128];
outptr[1] = s_pClip_table[(int32) DESCALE(tmp12 + tmp0, CONST_BITS+PASS1_BITS+3+1)+128];
outptr[2] = s_pClip_table[(int32) DESCALE(tmp12 - tmp0, CONST_BITS+PASS1_BITS+3+1)+128];
wsptr += DCTSIZE; /* advance pointer to next row */
}
}
