tableinittctemplate.cpp
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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.
*/
#if !defined(OUTVNC)
#error "This file shouldn't be compiled."
#error "It is included as part of translate.c"
#endif
#define OUT_T CONCAT2E(CARD,OUTVNC)
#define SwapOUTVNC(x) CONCAT2E(Swap,OUTVNC) (x)
#define rfbInitTrueColourSingleTableOUTVNC \
CONCAT2E(rfbInitTrueColourSingleTable,OUTVNC)
#define rfbInitTrueColourRGBTablesOUTVNC CONCAT2E(rfbInitTrueColourRGBTables,OUTVNC)
#define rfbInitOneRGBTableOUTVNC CONCAT2E(rfbInitOneRGBTable,OUTVNC)
static void
rfbInitOneRGBTableOUTVNC (OUT_T *table, int inMax, int outMax, int outShift,
int swap);
/*
* rfbInitTrueColourSingleTable sets up a single lookup table for truecolour
* translation.
*/
static void
rfbInitTrueColourSingleTableOUTVNC (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));
if (table == NULL) return;
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 (OUTVNC != 8)
if (out->bigEndian != in->bigEndian) {
t[i] = SwapOUTVNC(t[i]);
}
#endif
}
}
/*
* rfbInitTrueColourRGBTables sets up three separate lookup tables for the
* red, green and blue values.
*/
static void
rfbInitTrueColourRGBTablesOUTVNC (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;
rfbInitOneRGBTableOUTVNC (redTable, in->redMax, out->redMax,
out->redShift, (out->bigEndian != in->bigEndian));
rfbInitOneRGBTableOUTVNC (greenTable, in->greenMax, out->greenMax,
out->greenShift, (out->bigEndian != in->bigEndian));
rfbInitOneRGBTableOUTVNC (blueTable, in->blueMax, out->blueMax,
out->blueShift, (out->bigEndian != in->bigEndian));
}
static void
rfbInitOneRGBTableOUTVNC (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 (OUTVNC != 8)
if (swap) {
table[i] = SwapOUTVNC(table[i]);
}
#endif
}
}
#undef OUT_T
#undef SwapOUTVNC
#undef rfbInitTrueColourSingleTableOUTVNC
#undef rfbInitTrueColourRGBTablesOUTVNC
#undef rfbInitOneRGBTableOUTVNC