diff options
author | 2023-12-06 06:05:40 +1100 | |
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committer | 2023-12-06 06:05:40 +1100 | |
commit | 73751bcea9a5365e5f4d427986ba4f75fe0300ef (patch) | |
tree | 40f937b5d5e541a8ac68a80154bf30762e42c048 /3rdparty/libjpeg/jidctint.c | |
parent | 8b2ea383f5f4dffd15c9684e94b7a0d6868d2711 (diff) |
3rdparty/libjpeg: Updated to version 9e.
Diffstat (limited to '3rdparty/libjpeg/jidctint.c')
-rw-r--r-- | 3rdparty/libjpeg/jidctint.c | 45 |
1 files changed, 23 insertions, 22 deletions
diff --git a/3rdparty/libjpeg/jidctint.c b/3rdparty/libjpeg/jidctint.c index de233ec996e..e30ec8c8a46 100644 --- a/3rdparty/libjpeg/jidctint.c +++ b/3rdparty/libjpeg/jidctint.c @@ -2,7 +2,7 @@ * jidctint.c * * Copyright (C) 1991-1998, Thomas G. Lane. - * Modification developed 2002-2015 by Guido Vollbeding. + * Modification developed 2002-2018 by Guido Vollbeding. * This file is part of the Independent JPEG Group's software. * For conditions of distribution and use, see the accompanying README file. * @@ -166,6 +166,7 @@ /* * Perform dequantization and inverse DCT on one block of coefficients. * + * Optimized algorithm with 12 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/16). */ @@ -428,7 +429,7 @@ jpeg_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a 7x7 output block. + * producing a reduced-size 7x7 output block. * * Optimized algorithm with 12 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/14). @@ -1473,7 +1474,7 @@ jpeg_idct_10x10 (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a 11x11 output block. + * producing an 11x11 output block. * * Optimized algorithm with 24 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/22). @@ -2623,7 +2624,7 @@ jpeg_idct_16x16 (j_decompress_ptr cinfo, jpeg_component_info * compptr, tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); tmp0 <<= CONST_BITS; /* Add fudge factor here for final descale. */ - tmp0 += 1 << (CONST_BITS-PASS1_BITS-1); + tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); z1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ @@ -2920,13 +2921,6 @@ jpeg_idct_16x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, * The rotator is c(-6). */ - z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); - z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); - - z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ - tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ - tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ - z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); z2 <<= CONST_BITS; @@ -2937,6 +2931,13 @@ jpeg_idct_16x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, tmp0 = z2 + z3; tmp1 = z2 - z3; + z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); + z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); + + z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ + tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ + tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ + tmp10 = tmp0 + tmp2; tmp13 = tmp0 - tmp2; tmp11 = tmp1 + tmp3; @@ -3674,7 +3675,7 @@ jpeg_idct_10x5 (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a 8x4 output block. + * producing an 8x4 output block. * * 4-point IDCT in pass 1 (columns), 8-point in pass 2 (rows). */ @@ -3834,7 +3835,7 @@ jpeg_idct_8x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a reduced-size 6x3 output block. + * producing a 6x3 output block. * * 3-point IDCT in pass 1 (columns), 6-point in pass 2 (rows). */ @@ -4081,7 +4082,7 @@ jpeg_idct_2x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a 8x16 output block. + * producing an 8x16 output block. * * 16-point IDCT in pass 1 (columns), 8-point in pass 2 (rows). */ @@ -4883,13 +4884,6 @@ jpeg_idct_4x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, * The rotator is c(-6). */ - z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); - z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); - - z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ - tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ - tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ - z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); z2 <<= CONST_BITS; @@ -4900,6 +4894,13 @@ jpeg_idct_4x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, tmp0 = z2 + z3; tmp1 = z2 - z3; + z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); + z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); + + z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ + tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ + tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ + tmp10 = tmp0 + tmp2; tmp13 = tmp0 - tmp2; tmp11 = tmp1 + tmp3; @@ -5003,7 +5004,7 @@ jpeg_idct_4x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, /* * Perform dequantization and inverse DCT on one block of coefficients, - * producing a reduced-size 3x6 output block. + * producing a 3x6 output block. * * 6-point IDCT in pass 1 (columns), 3-point in pass 2 (rows). */ |