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-rw-r--r--tableinittctemplate.c142
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+/*
+ * 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