1 /*
2  * Copyright (c) 1999-2000 Image Power, Inc. and the University of
3  *   British Columbia.
4  * Copyright (c) 2001-2003 Michael David Adams.
5  * All rights reserved.
6  */
7 
8 /* __START_OF_JASPER_LICENSE__
9  *
10  * JasPer License Version 2.0
11  *
12  * Copyright (c) 2001-2006 Michael David Adams
13  * Copyright (c) 1999-2000 Image Power, Inc.
14  * Copyright (c) 1999-2000 The University of British Columbia
15  *
16  * All rights reserved.
17  *
18  * Permission is hereby granted, free of charge, to any person (the
19  * "User") obtaining a copy of this software and associated documentation
20  * files (the "Software"), to deal in the Software without restriction,
21  * including without limitation the rights to use, copy, modify, merge,
22  * publish, distribute, and/or sell copies of the Software, and to permit
23  * persons to whom the Software is furnished to do so, subject to the
24  * following conditions:
25  *
26  * 1.  The above copyright notices and this permission notice (which
27  * includes the disclaimer below) shall be included in all copies or
28  * substantial portions of the Software.
29  *
30  * 2.  The name of a copyright holder shall not be used to endorse or
31  * promote products derived from the Software without specific prior
32  * written permission.
33  *
34  * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
35  * LICENSE.  NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
36  * THIS DISCLAIMER.  THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
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38  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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40  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
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52  * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
53  * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
54  * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
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56  * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
57  * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
58  * RISK ACTIVITIES").  THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
59  * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
60  *
61  * __END_OF_JASPER_LICENSE__
62  */
63 
64 /*
65  * Multicomponent Transform Code
66  *
67  * $Id: jpc_mct.c,v 1.2 2008-05-26 09:40:52 vp153 Exp $
68  */
69 
70 /******************************************************************************\
71 * Includes.
72 \******************************************************************************/
73 
74 #include <assert.h>
75 
76 #include "jasper/jas_seq.h"
77 
78 #include "jpc_fix.h"
79 #include "jpc_mct.h"
80 
81 /******************************************************************************\
82 * Code.
83 \******************************************************************************/
84 
85 /* Compute the forward RCT. */
86 
jpc_rct(jas_matrix_t * c0,jas_matrix_t * c1,jas_matrix_t * c2)87 void jpc_rct(jas_matrix_t *c0, jas_matrix_t *c1, jas_matrix_t *c2)
88 {
89     int numrows;
90     int numcols;
91     int i;
92     int j;
93     jpc_fix_t *c0p;
94     jpc_fix_t *c1p;
95     jpc_fix_t *c2p;
96 
97     numrows = jas_matrix_numrows(c0);
98     numcols = jas_matrix_numcols(c0);
99 
100     /* All three matrices must have the same dimensions. */
101     assert(jas_matrix_numrows(c1) == numrows && jas_matrix_numcols(c1) == numcols
102       && jas_matrix_numrows(c2) == numrows && jas_matrix_numcols(c2) == numcols);
103 
104     for (i = 0; i < numrows; i++) {
105         c0p = jas_matrix_getref(c0, i, 0);
106         c1p = jas_matrix_getref(c1, i, 0);
107         c2p = jas_matrix_getref(c2, i, 0);
108         for (j = numcols; j > 0; --j) {
109             int r;
110             int g;
111             int b;
112             int y;
113             int u;
114             int v;
115             r = *c0p;
116             g = *c1p;
117             b = *c2p;
118             y = (r + (g << 1) + b) >> 2;
119             u = b - g;
120             v = r - g;
121             *c0p++ = y;
122             *c1p++ = u;
123             *c2p++ = v;
124         }
125     }
126 }
127 
128 /* Compute the inverse RCT. */
129 
jpc_irct(jas_matrix_t * c0,jas_matrix_t * c1,jas_matrix_t * c2)130 void jpc_irct(jas_matrix_t *c0, jas_matrix_t *c1, jas_matrix_t *c2)
131 {
132     int numrows;
133     int numcols;
134     int i;
135     int j;
136     jpc_fix_t *c0p;
137     jpc_fix_t *c1p;
138     jpc_fix_t *c2p;
139 
140     numrows = jas_matrix_numrows(c0);
141     numcols = jas_matrix_numcols(c0);
142 
143     /* All three matrices must have the same dimensions. */
144     assert(jas_matrix_numrows(c1) == numrows && jas_matrix_numcols(c1) == numcols
145       && jas_matrix_numrows(c2) == numrows && jas_matrix_numcols(c2) == numcols);
146 
147     for (i = 0; i < numrows; i++) {
148         c0p = jas_matrix_getref(c0, i, 0);
149         c1p = jas_matrix_getref(c1, i, 0);
150         c2p = jas_matrix_getref(c2, i, 0);
151         for (j = numcols; j > 0; --j) {
152             int r;
153             int g;
154             int b;
155             int y;
156             int u;
157             int v;
158             y = *c0p;
159             u = *c1p;
160             v = *c2p;
161             g = y - ((u + v) >> 2);
162             r = v + g;
163             b = u + g;
164             *c0p++ = r;
165             *c1p++ = g;
166             *c2p++ = b;
167         }
168     }
169 }
170 
jpc_ict(jas_matrix_t * c0,jas_matrix_t * c1,jas_matrix_t * c2)171 void jpc_ict(jas_matrix_t *c0, jas_matrix_t *c1, jas_matrix_t *c2)
172 {
173     int numrows;
174     int numcols;
175     int i;
176     int j;
177     jpc_fix_t r;
178     jpc_fix_t g;
179     jpc_fix_t b;
180     jpc_fix_t y;
181     jpc_fix_t u;
182     jpc_fix_t v;
183     jpc_fix_t *c0p;
184     jpc_fix_t *c1p;
185     jpc_fix_t *c2p;
186 
187     numrows = jas_matrix_numrows(c0);
188     assert(jas_matrix_numrows(c1) == numrows && jas_matrix_numrows(c2) == numrows);
189     numcols = jas_matrix_numcols(c0);
190     assert(jas_matrix_numcols(c1) == numcols && jas_matrix_numcols(c2) == numcols);
191     for (i = 0; i < numrows; ++i) {
192         c0p = jas_matrix_getref(c0, i, 0);
193         c1p = jas_matrix_getref(c1, i, 0);
194         c2p = jas_matrix_getref(c2, i, 0);
195         for (j = numcols; j > 0; --j) {
196             r = *c0p;
197             g = *c1p;
198             b = *c2p;
199             y = jpc_fix_add3(jpc_fix_mul(jpc_dbltofix(0.299), r), jpc_fix_mul(jpc_dbltofix(0.587), g),
200               jpc_fix_mul(jpc_dbltofix(0.114), b));
201             u = jpc_fix_add3(jpc_fix_mul(jpc_dbltofix(-0.16875), r), jpc_fix_mul(jpc_dbltofix(-0.33126), g),
202               jpc_fix_mul(jpc_dbltofix(0.5), b));
203             v = jpc_fix_add3(jpc_fix_mul(jpc_dbltofix(0.5), r), jpc_fix_mul(jpc_dbltofix(-0.41869), g),
204               jpc_fix_mul(jpc_dbltofix(-0.08131), b));
205             *c0p++ = y;
206             *c1p++ = u;
207             *c2p++ = v;
208         }
209     }
210 }
211 
jpc_iict(jas_matrix_t * c0,jas_matrix_t * c1,jas_matrix_t * c2)212 void jpc_iict(jas_matrix_t *c0, jas_matrix_t *c1, jas_matrix_t *c2)
213 {
214     int numrows;
215     int numcols;
216     int i;
217     int j;
218     jpc_fix_t r;
219     jpc_fix_t g;
220     jpc_fix_t b;
221     jpc_fix_t y;
222     jpc_fix_t u;
223     jpc_fix_t v;
224     jpc_fix_t *c0p;
225     jpc_fix_t *c1p;
226     jpc_fix_t *c2p;
227 
228     numrows = jas_matrix_numrows(c0);
229     assert(jas_matrix_numrows(c1) == numrows && jas_matrix_numrows(c2) == numrows);
230     numcols = jas_matrix_numcols(c0);
231     assert(jas_matrix_numcols(c1) == numcols && jas_matrix_numcols(c2) == numcols);
232     for (i = 0; i < numrows; ++i) {
233         c0p = jas_matrix_getref(c0, i, 0);
234         c1p = jas_matrix_getref(c1, i, 0);
235         c2p = jas_matrix_getref(c2, i, 0);
236         for (j = numcols; j > 0; --j) {
237             y = *c0p;
238             u = *c1p;
239             v = *c2p;
240             r = jpc_fix_add(y, jpc_fix_mul(jpc_dbltofix(1.402), v));
241             g = jpc_fix_add3(y, jpc_fix_mul(jpc_dbltofix(-0.34413), u),
242               jpc_fix_mul(jpc_dbltofix(-0.71414), v));
243             b = jpc_fix_add(y, jpc_fix_mul(jpc_dbltofix(1.772), u));
244             *c0p++ = r;
245             *c1p++ = g;
246             *c2p++ = b;
247         }
248     }
249 }
250 
jpc_mct_getsynweight(int mctid,int cmptno)251 jpc_fix_t jpc_mct_getsynweight(int mctid, int cmptno)
252 {
253     jpc_fix_t synweight;
254 
255     synweight = JPC_FIX_ONE;
256     switch (mctid) {
257     case JPC_MCT_RCT:
258         switch (cmptno) {
259         case 0:
260             synweight = jpc_dbltofix(sqrt(3.0));
261             break;
262         case 1:
263             synweight = jpc_dbltofix(sqrt(0.6875));
264             break;
265         case 2:
266             synweight = jpc_dbltofix(sqrt(0.6875));
267             break;
268         }
269         break;
270     case JPC_MCT_ICT:
271         switch (cmptno) {
272         case 0:
273             synweight = jpc_dbltofix(sqrt(3.0000));
274             break;
275         case 1:
276             synweight = jpc_dbltofix(sqrt(3.2584));
277             break;
278         case 2:
279             synweight = jpc_dbltofix(sqrt(2.4755));
280             break;
281         }
282         break;
283 #if 0
284     default:
285         synweight = JPC_FIX_ONE;
286         break;
287 #endif
288     }
289 
290     return synweight;
291 }
292