Import X server from vnc-3.3.7.

[rdpsrv] / Xserver / programs / Xserver / hw / vnc / tableinittctemplate.c

diff --git a/Xserver/programs/Xserver/hw/vnc/tableinittctemplate.c b/Xserver/programs/Xserver/hw/vnc/tableinittctemplate.c
new file mode 100644 (file)
index 0000000..18ff0ef
--- /dev/null
+++ b/Xserver/programs/Xserver/hw/vnc/tableinittctemplate.c
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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.
+ */
+
+/*
+ *  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 *)malloc(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 *)malloc((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