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pcg |
1.1 |
#define FIX_0_298631336 ((s32) 2446) /* FIX(0.298631336) */ |
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#define FIX_0_390180644 ((s32) 3196) /* FIX(0.390180644) */ |
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#define FIX_0_541196100 ((s32) 4433) /* FIX(0.541196100) */ |
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#define FIX_0_765366865 ((s32) 6270) /* FIX(0.765366865) */ |
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#define FIX_0_899976223 ((s32) 7373) /* FIX(0.899976223) */ |
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#define FIX_1_175875602 ((s32) 9633) /* FIX(1.175875602) */ |
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#define FIX_1_501321110 ((s32) 12299) /* FIX(1.501321110) */ |
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#define FIX_1_847759065 ((s32) 15137) /* FIX(1.847759065) */ |
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#define FIX_1_961570560 ((s32) 16069) /* FIX(1.961570560) */ |
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#define FIX_2_053119869 ((s32) 16819) /* FIX(2.053119869) */ |
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#define FIX_2_562915447 ((s32) 20995) /* FIX(2.562915447) */ |
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#define FIX_3_072711026 ((s32) 25172) /* FIX(3.072711026) */ |
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#define MULTIPLY(var,const) ( (s32) ((var)*(const)) ) |
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#define DESCALE(x,n) ((x)>>(n)) |
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void RTjpeg_dct_init(void) |
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{ |
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} |
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void RTjpeg_dct(u8 *idata, s16 *odata, int rskip) |
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{ |
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s32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
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s32 tmp10, tmp11, tmp12, tmp13; |
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s32 z1, z2, z3, z4, z5; |
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u8 *idataptr; |
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s16 * odataptr; |
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int ctr; |
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idataptr = idata; |
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odataptr = odata; |
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for (ctr = 7; ctr >= 0; ctr--) { |
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tmp0 = idataptr[0] + idataptr[7]; |
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tmp7 = idataptr[0] - idataptr[7]; |
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tmp1 = idataptr[1] + idataptr[6]; |
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tmp6 = idataptr[1] - idataptr[6]; |
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tmp2 = idataptr[2] + idataptr[5]; |
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tmp5 = idataptr[2] - idataptr[5]; |
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tmp3 = idataptr[3] + idataptr[4]; |
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tmp4 = idataptr[3] - idataptr[4]; |
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tmp10 = tmp0 + tmp3; |
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tmp13 = tmp0 - tmp3; |
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tmp11 = tmp1 + tmp2; |
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tmp12 = tmp1 - tmp2; |
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odataptr[0] = (s32) ((tmp10 + tmp11) << 2); |
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odataptr[4] = (s32) ((tmp10 - tmp11) << 2); |
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z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100); |
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odataptr[2] = (s32) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865), 11); |
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odataptr[6] = (s32) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065), 11); |
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z1 = tmp4 + tmp7; |
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z2 = tmp5 + tmp6; |
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z3 = tmp4 + tmp6; |
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z4 = tmp5 + tmp7; |
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z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */ |
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tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
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tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
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tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
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tmp7 = MULTIPLY(tmp7, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
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z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
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z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
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z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
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z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
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z3 += z5; |
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z4 += z5; |
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odataptr[7] = (s32) DESCALE(tmp4 + z1 + z3, 11); |
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odataptr[5] = (s32) DESCALE(tmp5 + z2 + z4, 11); |
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odataptr[3] = (s32) DESCALE(tmp6 + z2 + z3, 11); |
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odataptr[1] = (s32) DESCALE(tmp7 + z1 + z4, 11); |
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odataptr += 8; /* advance pointer to next row */ |
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idataptr += rskip; |
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} |
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odataptr = odata; |
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for (ctr = 7; ctr >= 0; ctr--) { |
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tmp0 = odataptr[0] + odataptr[56]; |
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tmp7 = odataptr[0] - odataptr[56]; |
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tmp1 = odataptr[8] + odataptr[48]; |
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tmp6 = odataptr[8] - odataptr[48]; |
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tmp2 = odataptr[16] + odataptr[40]; |
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tmp5 = odataptr[16] - odataptr[40]; |
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tmp3 = odataptr[24] + odataptr[32]; |
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tmp4 = odataptr[24] - odataptr[32]; |
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tmp10 = tmp0 + tmp3; |
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tmp13 = tmp0 - tmp3; |
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tmp11 = tmp1 + tmp2; |
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tmp12 = tmp1 - tmp2; |
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odataptr[0] = (s32) DESCALE(tmp10 + tmp11, 2); |
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odataptr[32] = (s32) DESCALE(tmp10 - tmp11, 2); |
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z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100); |
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odataptr[16] = (s32) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865), 15); |
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odataptr[48] = (s32) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065), 15); |
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z1 = tmp4 + tmp7; |
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z2 = tmp5 + tmp6; |
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z3 = tmp4 + tmp6; |
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z4 = tmp5 + tmp7; |
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z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */ |
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tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
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tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
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tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
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tmp7 = MULTIPLY(tmp7, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
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z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
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z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
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z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
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z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
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z3 += z5; |
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z4 += z5; |
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odataptr[56] = (s32) DESCALE(tmp4 + z1 + z3, 15); |
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odataptr[40] = (s32) DESCALE(tmp5 + z2 + z4, 15); |
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odataptr[24] = (s32) DESCALE(tmp6 + z2 + z3, 15); |
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odataptr[8] = (s32) DESCALE(tmp7 + z1 + z4, 15); |
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odataptr++; /* advance pointer to next column */ |
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} |
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} |
