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| 4758 | right-hear | 1 | /* |
| 2 | * Copyright (c) 2001-2003, David Janssens |
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| 3 | * Copyright (c) 2002-2003, Yannick Verschueren |
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| 4 | * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe |
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| 5 | * Copyright (c) 2005, Hervé Drolon, FreeImage Team |
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| 6 | * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium |
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| 7 | * All rights reserved. |
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| 8 | * |
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| 9 | * Redistribution and use in source and binary forms, with or without |
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| 10 | * modification, are permitted provided that the following conditions |
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| 11 | * are met: |
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| 12 | * 1. Redistributions of source code must retain the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer. |
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| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 15 | * notice, this list of conditions and the following disclaimer in the |
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| 16 | * documentation and/or other materials provided with the distribution. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
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| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 28 | * POSSIBILITY OF SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |||
| 31 | #include "opj_includes.h" |
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| 32 | |||
| 33 | /* |
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| 34 | /* This table contains the norms of the basis function of the reversible MCT. */ |
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| 35 | /* */ |
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| 36 | static const double mct_norms[3] = { 1.732, .8292, .8292 }; |
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| 37 | |||
| 38 | /* |
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| 39 | /* This table contains the norms of the basis function of the irreversible MCT. */ |
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| 40 | /* */ |
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| 41 | static const double mct_norms_real[3] = { 1.732, 1.805, 1.573 }; |
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| 42 | |||
| 43 | /* |
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| 44 | /* Foward reversible MCT. */ |
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| 45 | /* */ |
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| 46 | void mct_encode(int *c0, int *c1, int *c2, int n) { |
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| 47 | int i; |
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| 48 | for (i = 0; i < n; i++) { |
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| 49 | int r, g, b, y, u, v; |
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| 50 | r = c0[i]; |
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| 51 | g = c1[i]; |
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| 52 | b = c2[i]; |
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| 53 | y = (r + (g << 1) + b) >> 2; |
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| 54 | u = b - g; |
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| 55 | v = r - g; |
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| 56 | c0[i] = y; |
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| 57 | c1[i] = u; |
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| 58 | c2[i] = v; |
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| 59 | } |
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| 60 | } |
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| 61 | |||
| 62 | /* |
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| 63 | /* Inverse reversible MCT. */ |
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| 64 | /* */ |
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| 65 | void mct_decode(int *c0, int *c1, int *c2, int n) { |
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| 66 | int i; |
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| 67 | for (i = 0; i < n; i++) { |
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| 68 | int y, u, v, r, g, b; |
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| 69 | y = c0[i]; |
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| 70 | u = c1[i]; |
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| 71 | v = c2[i]; |
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| 72 | g = y - ((u + v) >> 2); |
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| 73 | r = v + g; |
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| 74 | b = u + g; |
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| 75 | c0[i] = r; |
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| 76 | c1[i] = g; |
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| 77 | c2[i] = b; |
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| 78 | } |
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| 79 | } |
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| 80 | |||
| 81 | /* |
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| 82 | /* Get norm of basis function of reversible MCT. */ |
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| 83 | /* */ |
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| 84 | double mct_getnorm(int compno) { |
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| 85 | return mct_norms[compno]; |
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| 86 | } |
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| 87 | |||
| 88 | /* |
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| 89 | /* Foward irreversible MCT. */ |
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| 90 | /* */ |
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| 91 | void mct_encode_real(int *c0, int *c1, int *c2, int n) { |
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| 92 | int i; |
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| 93 | for (i = 0; i < n; i++) { |
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| 94 | int r, g, b, y, u, v; |
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| 95 | r = c0[i]; |
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| 96 | g = c1[i]; |
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| 97 | b = c2[i]; |
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| 98 | y = fix_mul(r, 2449) + fix_mul(g, 4809) + fix_mul(b, 934); |
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| 99 | u = -fix_mul(r, 1382) - fix_mul(g, 2714) + fix_mul(b, 4096); |
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| 100 | v = fix_mul(r, 4096) - fix_mul(g, 3430) - fix_mul(b, 666); |
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| 101 | c0[i] = y; |
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| 102 | c1[i] = u; |
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| 103 | c2[i] = v; |
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| 104 | } |
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| 105 | } |
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| 106 | |||
| 107 | /* |
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| 108 | /* Inverse irreversible MCT. */ |
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| 109 | /* */ |
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| 110 | void mct_decode_real(int *c0, int *c1, int *c2, int n) { |
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| 111 | int i; |
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| 112 | for (i = 0; i < n; i++) { |
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| 113 | int y, u, v, r, g, b; |
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| 114 | y = c0[i]; |
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| 115 | u = c1[i]; |
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| 116 | v = c2[i]; |
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| 117 | r = y + fix_mul(v, 11485); |
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| 118 | g = y - fix_mul(u, 2819) - fix_mul(v, 5850); |
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| 119 | b = y + fix_mul(u, 14516); |
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| 120 | c0[i] = r; |
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| 121 | c1[i] = g; |
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| 122 | c2[i] = b; |
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| 123 | } |
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| 124 | } |
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| 125 | |||
| 126 | /* |
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| 127 | /* Get norm of basis function of irreversible MCT. */ |
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| 128 | /* */ |
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| 129 | double mct_getnorm_real(int compno) { |
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| 130 | return mct_norms_real[compno]; |
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| 131 | } |