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 */ } }