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tableinitcmtemplate.c
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1 /*
2  * tableinitcmtemplate.c - template for initialising lookup tables for
3  * translation from a colour map to true colour.
4  *
5  * This file shouldn't be compiled. It is included multiple times by
6  * translate.c, each time with a different definition of the macro OUT.
7  * For each value of OUT, this file defines a function which allocates an
8  * appropriately sized lookup table and initialises it.
9  *
10  * I know this code isn't nice to read because of all the macros, but
11  * efficiency is important here.
12  */
13 
14 /*
15  * OSXvnc Copyright (C) 2001 Dan McGuirk <mcguirk@incompleteness.net>.
16  * Original Xvnc code Copyright (C) 1999 AT&T Laboratories Cambridge.
17  * All Rights Reserved.
18  *
19  * This is free software; you can redistribute it and/or modify
20  * it under the terms of the GNU General Public License as published by
21  * the Free Software Foundation; either version 2 of the License, or
22  * (at your option) any later version.
23  *
24  * This software is distributed in the hope that it will be useful,
25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27  * GNU General Public License for more details.
28  *
29  * You should have received a copy of the GNU General Public License
30  * along with this software; if not, write to the Free Software
31  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
32  * USA.
33  */
34 
35 #if !defined(OUT)
36 #error "This file shouldn't be compiled."
37 #error "It is included as part of translate.c"
38 #endif
39 
40 #define OUT_T CONCAT3E(uint,OUT,_t)
41 #define SwapOUT(x) CONCAT2E(Swap,OUT(x))
42 #define rfbInitColourMapSingleTableOUT \
43  CONCAT2E(rfbInitColourMapSingleTable,OUT)
44 
45 static void
47  rfbPixelFormat *out,rfbColourMap* colourMap)
48 {
49  uint32_t i, r, g, b;
50  OUT_T *t;
51  uint32_t nEntries = 1 << in->bitsPerPixel;
52  int shift = colourMap->is16?16:8;
53 
54  if (*table) free(*table);
55  *table = (char *)malloc(nEntries * sizeof(OUT_T));
56  t = (OUT_T *)*table;
57 
58  for (i = 0; i < nEntries; i++) {
59  r = g = b = 0;
60  if(i < colourMap->count) {
61  if(colourMap->is16) {
62  r = colourMap->data.shorts[3*i+0];
63  g = colourMap->data.shorts[3*i+1];
64  b = colourMap->data.shorts[3*i+2];
65  } else {
66  r = colourMap->data.bytes[3*i+0];
67  g = colourMap->data.bytes[3*i+1];
68  b = colourMap->data.bytes[3*i+2];
69  }
70  }
71  t[i] = ((((r * (1 + out->redMax)) >> shift) << out->redShift) |
72  (((g * (1 + out->greenMax)) >> shift) << out->greenShift) |
73  (((b * (1 + out->blueMax)) >> shift) << out->blueShift));
74 #if (OUT != 8)
75  if (out->bigEndian != in->bigEndian) {
76  t[i] = SwapOUT(t[i]);
77  }
78 #endif
79  }
80 }
81 
82 #undef OUT_T
83 #undef SwapOUT
84 #undef rfbInitColourMapSingleTableOUT