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| #define JPEG_INTERNALS |
| #include "jinclude.h" |
| #include "jpeglib.h" |
| #include "jdct.h" |
| |
| #ifdef DCT_FLOAT_SUPPORTED |
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| #if DCTSIZE != 8 |
| Sorry, this code only copes with 8x8 DCTs. |
| #endif |
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| #define DEQUANTIZE(coef, quantval) (((FAST_FLOAT)(coef)) * (quantval)) |
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| GLOBAL(void) |
| jpeg_idct_float(j_decompress_ptr cinfo, jpeg_component_info *compptr, |
| JCOEFPTR coef_block, JSAMPARRAY output_buf, |
| JDIMENSION output_col) |
| { |
| FAST_FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
| FAST_FLOAT tmp10, tmp11, tmp12, tmp13; |
| FAST_FLOAT z5, z10, z11, z12, z13; |
| JCOEFPTR inptr; |
| FLOAT_MULT_TYPE *quantptr; |
| FAST_FLOAT *wsptr; |
| JSAMPROW outptr; |
| JSAMPLE *range_limit = cinfo->sample_range_limit; |
| int ctr; |
| FAST_FLOAT workspace[DCTSIZE2]; |
| #define _0_125 ((FLOAT_MULT_TYPE)0.125) |
| |
| |
| |
| inptr = coef_block; |
| quantptr = (FLOAT_MULT_TYPE *)compptr->dct_table; |
| wsptr = workspace; |
| for (ctr = DCTSIZE; ctr > 0; ctr--) { |
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| 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) { |
| |
| FAST_FLOAT dcval = DEQUANTIZE(inptr[DCTSIZE * 0], |
| quantptr[DCTSIZE * 0] * _0_125); |
| |
| 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++; |
| quantptr++; |
| wsptr++; |
| continue; |
| } |
| |
| |
| |
| tmp0 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0] * _0_125); |
| tmp1 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2] * _0_125); |
| tmp2 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4] * _0_125); |
| tmp3 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6] * _0_125); |
| |
| tmp10 = tmp0 + tmp2; |
| tmp11 = tmp0 - tmp2; |
| |
| tmp13 = tmp1 + tmp3; |
| tmp12 = (tmp1 - tmp3) * ((FAST_FLOAT)1.414213562) - tmp13; |
| |
| tmp0 = tmp10 + tmp13; |
| tmp3 = tmp10 - tmp13; |
| tmp1 = tmp11 + tmp12; |
| tmp2 = tmp11 - tmp12; |
| |
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| tmp4 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1] * _0_125); |
| tmp5 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3] * _0_125); |
| tmp6 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5] * _0_125); |
| tmp7 = DEQUANTIZE(inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7] * _0_125); |
| |
| z13 = tmp6 + tmp5; |
| z10 = tmp6 - tmp5; |
| z11 = tmp4 + tmp7; |
| z12 = tmp4 - tmp7; |
| |
| tmp7 = z11 + z13; |
| tmp11 = (z11 - z13) * ((FAST_FLOAT)1.414213562); |
| |
| z5 = (z10 + z12) * ((FAST_FLOAT)1.847759065); |
| tmp10 = z5 - z12 * ((FAST_FLOAT)1.082392200); |
| tmp12 = z5 - z10 * ((FAST_FLOAT)2.613125930); |
| |
| tmp6 = tmp12 - tmp7; |
| tmp5 = tmp11 - tmp6; |
| tmp4 = tmp10 - tmp5; |
| |
| wsptr[DCTSIZE * 0] = tmp0 + tmp7; |
| wsptr[DCTSIZE * 7] = tmp0 - tmp7; |
| wsptr[DCTSIZE * 1] = tmp1 + tmp6; |
| wsptr[DCTSIZE * 6] = tmp1 - tmp6; |
| wsptr[DCTSIZE * 2] = tmp2 + tmp5; |
| wsptr[DCTSIZE * 5] = tmp2 - tmp5; |
| wsptr[DCTSIZE * 3] = tmp3 + tmp4; |
| wsptr[DCTSIZE * 4] = tmp3 - tmp4; |
| |
| inptr++; |
| quantptr++; |
| wsptr++; |
| } |
| |
| |
| |
| wsptr = workspace; |
| for (ctr = 0; ctr < DCTSIZE; ctr++) { |
| outptr = output_buf[ctr] + output_col; |
| |
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| z5 = wsptr[0] + ((FAST_FLOAT)CENTERJSAMPLE + (FAST_FLOAT)0.5); |
| tmp10 = z5 + wsptr[4]; |
| tmp11 = z5 - wsptr[4]; |
| |
| tmp13 = wsptr[2] + wsptr[6]; |
| tmp12 = (wsptr[2] - wsptr[6]) * ((FAST_FLOAT)1.414213562) - tmp13; |
| |
| tmp0 = tmp10 + tmp13; |
| tmp3 = tmp10 - tmp13; |
| tmp1 = tmp11 + tmp12; |
| tmp2 = tmp11 - tmp12; |
| |
| |
| |
| z13 = wsptr[5] + wsptr[3]; |
| z10 = wsptr[5] - wsptr[3]; |
| z11 = wsptr[1] + wsptr[7]; |
| z12 = wsptr[1] - wsptr[7]; |
| |
| tmp7 = z11 + z13; |
| tmp11 = (z11 - z13) * ((FAST_FLOAT)1.414213562); |
| |
| z5 = (z10 + z12) * ((FAST_FLOAT)1.847759065); |
| tmp10 = z5 - z12 * ((FAST_FLOAT)1.082392200); |
| tmp12 = z5 - z10 * ((FAST_FLOAT)2.613125930); |
| |
| tmp6 = tmp12 - tmp7; |
| tmp5 = tmp11 - tmp6; |
| tmp4 = tmp10 - tmp5; |
| |
| |
| |
| outptr[0] = range_limit[((int)(tmp0 + tmp7)) & RANGE_MASK]; |
| outptr[7] = range_limit[((int)(tmp0 - tmp7)) & RANGE_MASK]; |
| outptr[1] = range_limit[((int)(tmp1 + tmp6)) & RANGE_MASK]; |
| outptr[6] = range_limit[((int)(tmp1 - tmp6)) & RANGE_MASK]; |
| outptr[2] = range_limit[((int)(tmp2 + tmp5)) & RANGE_MASK]; |
| outptr[5] = range_limit[((int)(tmp2 - tmp5)) & RANGE_MASK]; |
| outptr[3] = range_limit[((int)(tmp3 + tmp4)) & RANGE_MASK]; |
| outptr[4] = range_limit[((int)(tmp3 - tmp4)) & RANGE_MASK]; |
| |
| wsptr += DCTSIZE; |
| } |
| } |
| |
| #endif |