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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 INBPP and OUTBPP.
*
* For each pair of values INBPP and OUTBPP, 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(INBPP) || !defined(OUTBPP)
#error "This file shouldn't be compiled."
#error "It is included as part of translate.c"
#endif
#define IN_T CONCAT2E(CARD,INBPP)
#define OUT_T CONCAT2E(CARD,OUTBPP)
#define rfbTranslateWithSingleTableINtoOUT \
CONCAT4E(rfbTranslateWithSingleTable,INBPP,to,OUTBPP)
#define rfbTranslateWithRGBTablesINtoOUT \
CONCAT4E(rfbTranslateWithRGBTables,INBPP,to,OUTBPP)
/*
* rfbTranslateWithSingleTableINtoOUT translates a rectangle of pixel data
* using a single lookup table.
*/
static void
rfbTranslateWithSingleTableINtoOUT (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--;
}
}
/*
* rfbTranslateWithRGBTablesINtoOUT translates a rectangle of pixel data
* using three separate lookup tables for the red, green and blue values.
*/
static void
rfbTranslateWithRGBTablesINtoOUT (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;
IN_T in_pix;
OUT_T out_pix;
while (height > 0) {
opLineEnd = op + width;
while (op < opLineEnd) {
in_pix = *ip++;
out_pix = redTable[(in_pix >> in->redShift) & in->redMax];
out_pix |= greenTable[(in_pix >> in->greenShift) & in->greenMax];
out_pix |= blueTable[(in_pix >> in->blueShift) & in->blueMax];
*op++ = out_pix;
}
ip += ipextra;
height--;
}
}
#undef IN_T
#undef OUT_T
#undef rfbTranslateWithSingleTableINtoOUT
#undef rfbTranslateWithRGBTablesINtoOUT
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