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Diffstat (limited to 'libopenjpeg/mct.c')
| -rw-r--r-- | libopenjpeg/mct.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/libopenjpeg/mct.c b/libopenjpeg/mct.c new file mode 100644 index 00000000..ef371e92 --- /dev/null +++ b/libopenjpeg/mct.c @@ -0,0 +1,134 @@ +/* + * Copyright (c) 2001-2002, David Janssens + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include "mct.h" +#include "fix.h" + +/* <summary> */ +/* This table contains the norms of the basis function of the reversible MCT. */ +/* </summary> */ +double mct_norms[3] = { 1.732, .8292, .8292 }; + +/* <summary> */ +/* This table contains the norms of the basis function of the irreversible MCT. */ +/* </summary> */ +double mct_norms_real[3] = { 1.732, 1.805, 1.573 }; + +/* <summary> */ +/* Foward reversible MCT. */ +/* </summary> */ +void mct_encode(int *c0, int *c1, int *c2, int n) +{ + int i; + for (i = 0; i < n; i++) { + int r, g, b, y, u, v; + r = c0[i]; + g = c1[i]; + b = c2[i]; + y = (r + (g << 1) + b) >> 2; + u = b - g; + v = r - g; + c0[i] = y; + c1[i] = u; + c2[i] = v; + } +} + +/* <summary> */ +/* Inverse reversible MCT. */ +/* </summary> */ +void mct_decode(int *c0, int *c1, int *c2, int n) +{ + int i; + for (i = 0; i < n; i++) { + int y, u, v, r, g, b; + y = c0[i]; + u = c1[i]; + v = c2[i]; + g = y - ((u + v) >> 2); + r = v + g; + b = u + g; + c0[i] = r; + c1[i] = g; + c2[i] = b; + } +} + +/* <summary> */ +/* Get norm of basis function of reversible MCT. */ +/* </summary> */ +double mct_getnorm(int compno) +{ + return mct_norms[compno]; +} + +/* <summary> */ +/* Foward irreversible MCT. */ +/* </summary> */ +void mct_encode_real(int *c0, int *c1, int *c2, int n) +{ + int i; + for (i = 0; i < n; i++) { + int r, g, b, y, u, v; + r = c0[i]; + g = c1[i]; + b = c2[i]; + y = fix_mul(r, 2449) + fix_mul(g, 4809) + fix_mul(b, 934); + u = -fix_mul(r, 1382) - fix_mul(g, 2714) + fix_mul(b, 4096); + v = fix_mul(r, 4096) - fix_mul(g, 3430) - fix_mul(b, 666); + c0[i] = y; + c1[i] = u; + c2[i] = v; + } +} + +/* <summary> */ +/* Inverse irreversible MCT. */ +/* </summary> */ +void mct_decode_real(int *c0, int *c1, int *c2, int n) +{ + int i; + for (i = 0; i < n; i++) { + int y, u, v, r, g, b; + y = c0[i]; + u = c1[i]; + v = c2[i]; + r = y + fix_mul(v, 11485); + g = y - fix_mul(u, 2819) - fix_mul(v, 5850); + b = y + fix_mul(u, 14516); + c0[i] = r; + c1[i] = g; + c2[i] = b; + } +} + +/* <summary> */ +/* Get norm of basis function of irreversible MCT. */ +/* </summary> */ +double mct_getnorm_real(int compno) +{ + return mct_norms_real[compno]; +} |