tabletranstemplate.cpp
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/*
* tabletranstemplate.c - template for translation using lookup tables.
*
* This file shouldn't be compiled. It is included multiple times by
* translate.c, each time with different definitions of the macros IN and OUT.
*
* For each pair of values IN and OUT, this file defines two functions for
* translating a given rectangle of pixel data. One uses a single lookup
* table, and the other uses 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(INVNC) || !defined(OUTVNC)
#error "This file shouldn't be compiled."
#error "It is included as part of translate.c"
#endif
#define IN_T CONCAT2E(CARD,INVNC)
#define OUT_T CONCAT2E(CARD,OUTVNC)
#define rfbTranslateWithSingleTableINVNCtoOUTVNC \
CONCAT4E(rfbTranslateWithSingleTable,INVNC,to,OUTVNC)
#define rfbTranslateWithRGBTablesINVNCtoOUTVNC \
CONCAT4E(rfbTranslateWithRGBTables,INVNC,to,OUTVNC)
/*
* rfbTranslateWithSingleTableINVNCtoOUTVNC translates a rectangle of pixel data
* using a single lookup table.
*/
static void
rfbTranslateWithSingleTableINVNCtoOUTVNC (char *table, rfbPixelFormat *in,
rfbPixelFormat *out,
char *iptr, char *optr,
int bytesBetweenInputLines,
int width, int height)
{
IN_T *ip = (IN_T *)iptr;
OUT_T *op = (OUT_T *)optr;
int ipextra = bytesBetweenInputLines / sizeof(IN_T) - width;
OUT_T *opLineEnd;
OUT_T *t = (OUT_T *)table;
while (height > 0) {
opLineEnd = op + width;
while (op < opLineEnd) {
*(op++) = t[*(ip++)];
}
ip += ipextra;
height--;
}
}
/*
* rfbTranslateWithRGBTablesINVNCtoOUTVNC translates a rectangle of pixel data
* using three separate lookup tables for the red, green and blue values.
*/
static void
rfbTranslateWithRGBTablesINVNCtoOUTVNC (char *table, rfbPixelFormat *in,
rfbPixelFormat *out,
char *iptr, char *optr,
int bytesBetweenInputLines,
int width, int height)
{
IN_T *ip = (IN_T *)iptr;
OUT_T *op = (OUT_T *)optr;
int ipextra = bytesBetweenInputLines / sizeof(IN_T) - width;
OUT_T *opLineEnd;
OUT_T *redTable = (OUT_T *)table;
OUT_T *greenTable = redTable + in->redMax + 1;
OUT_T *blueTable = greenTable + in->greenMax + 1;
while (height > 0) {
opLineEnd = op + width;
while (op < opLineEnd) {
*(op++) = (redTable[(*ip >> in->redShift) & in->redMax] |
greenTable[(*ip >> in->greenShift) & in->greenMax] |
blueTable[(*ip >> in->blueShift) & in->blueMax]);
ip++;
}
ip += ipextra;
height--;
}
}
#undef IN_T
#undef OUT_T
#undef rfbTranslateWithSingleTableINVNCtoOUTVNC
#undef rfbTranslateWithRGBTablesINVNCtoOUTVNC