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Diffstat (limited to 'tableinittctemplate.c')
| -rw-r--r-- | tableinittctemplate.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/tableinittctemplate.c b/tableinittctemplate.c new file mode 100644 index 0000000..e5f94d5 --- /dev/null +++ b/tableinittctemplate.c @@ -0,0 +1,142 @@ +/* + * tableinittctemplate.c - template for initialising lookup tables for + * truecolour to truecolour translation. + * + * This file shouldn't be compiled. It is included multiple times by + * translate.c, each time with a different definition of the macro OUT. + * For each value of OUT, this file defines two functions for initialising + * lookup tables. One is for truecolour translation using a single lookup + * table, the other is for truecolour translation using three separate + * lookup tables for the red, green and blue values. + * + * I know this code isn't nice to read because of all the macros, but + * efficiency is important here. + */ + +/* + * OSXvnc Copyright (C) 2001 Dan McGuirk <mcguirk@incompleteness.net>. + * Original Xvnc code Copyright (C) 1999 AT&T Laboratories Cambridge. + * All Rights Reserved. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This software is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this software; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, + * USA. + */ + +#if !defined(OUT) +#error "This file shouldn't be compiled." +#error "It is included as part of translate.c" +#endif + +#define OUT_T CONCAT2E(CARD,OUT) +#define SwapOUT(x) CONCAT2E(Swap,OUT(x)) +#define rfbInitTrueColourSingleTableOUT \ + CONCAT2E(rfbInitTrueColourSingleTable,OUT) +#define rfbInitTrueColourRGBTablesOUT CONCAT2E(rfbInitTrueColourRGBTables,OUT) +#define rfbInitOneRGBTableOUT CONCAT2E(rfbInitOneRGBTable,OUT) + +static void +rfbInitOneRGBTableOUT (OUT_T *table, int inMax, int outMax, int outShift, + int swap); + + +/* + * rfbInitTrueColourSingleTable sets up a single lookup table for truecolour + * translation. + */ + +static void +rfbInitTrueColourSingleTableOUT (char **table, rfbPixelFormat *in, + rfbPixelFormat *out) +{ + int i; + int inRed, inGreen, inBlue, outRed, outGreen, outBlue; + OUT_T *t; + int nEntries = 1 << in->bitsPerPixel; + + if (*table) free(*table); + *table = (char *)xalloc(nEntries * sizeof(OUT_T)); + t = (OUT_T *)*table; + + for (i = 0; i < nEntries; i++) { + inRed = (i >> in->redShift) & in->redMax; + inGreen = (i >> in->greenShift) & in->greenMax; + inBlue = (i >> in->blueShift) & in->blueMax; + + outRed = (inRed * out->redMax + in->redMax / 2) / in->redMax; + outGreen = (inGreen * out->greenMax + in->greenMax / 2) / in->greenMax; + outBlue = (inBlue * out->blueMax + in->blueMax / 2) / in->blueMax; + + t[i] = ((outRed << out->redShift) | + (outGreen << out->greenShift) | + (outBlue << out->blueShift)); +#if (OUT != 8) + if (out->bigEndian != in->bigEndian) { + t[i] = SwapOUT(t[i]); + } +#endif + } +} + + +/* + * rfbInitTrueColourRGBTables sets up three separate lookup tables for the + * red, green and blue values. + */ + +static void +rfbInitTrueColourRGBTablesOUT (char **table, rfbPixelFormat *in, + rfbPixelFormat *out) +{ + OUT_T *redTable; + OUT_T *greenTable; + OUT_T *blueTable; + + if (*table) free(*table); + *table = (char *)xalloc((in->redMax + in->greenMax + in->blueMax + 3) + * sizeof(OUT_T)); + redTable = (OUT_T *)*table; + greenTable = redTable + in->redMax + 1; + blueTable = greenTable + in->greenMax + 1; + + rfbInitOneRGBTableOUT (redTable, in->redMax, out->redMax, + out->redShift, (out->bigEndian != in->bigEndian)); + rfbInitOneRGBTableOUT (greenTable, in->greenMax, out->greenMax, + out->greenShift, (out->bigEndian != in->bigEndian)); + rfbInitOneRGBTableOUT (blueTable, in->blueMax, out->blueMax, + out->blueShift, (out->bigEndian != in->bigEndian)); +} + +static void +rfbInitOneRGBTableOUT (OUT_T *table, int inMax, int outMax, int outShift, + int swap) +{ + int i; + int nEntries = inMax + 1; + + for (i = 0; i < nEntries; i++) { + table[i] = ((i * outMax + inMax / 2) / inMax) << outShift; +#if (OUT != 8) + if (swap) { + table[i] = SwapOUT(table[i]); + } +#endif + } +} + +#undef OUT_T +#undef SwapOUT +#undef rfbInitTrueColourSingleTableOUT +#undef rfbInitTrueColourRGBTablesOUT +#undef rfbInitOneRGBTableOUT |