123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
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/*
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* tableinittctemplate.c - template for initialising lookup tables for
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* truecolour to truecolour translation.
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*
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* This file shouldn't be compiled. It is included multiple times by
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* translate.c, each time with a different definition of the macro OUTBPP.
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* For each value of OUTBPP, this file defines two functions for initialising
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* lookup tables. One is for truecolour translation using a single lookup
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* table, the other is for truecolour translation using three separate
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* lookup tables for the red, green and blue values.
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*
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* I know this code isn't nice to read because of all the macros, but
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* efficiency is important here.
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*/
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#if !defined(OUTBPP)
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#error "This file shouldn't be compiled."
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#error "It is included as part of translate.c"
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#endif
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#define OUT_T CONCAT2E(CARD,OUTBPP)
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#define SwapOUT(x) CONCAT2E(Swap,OUTBPP) (x)
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#define rfbInitTrueColourSingleTableOUT \
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CONCAT2E(rfbInitTrueColourSingleTable,OUTBPP)
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#define rfbInitTrueColourRGBTablesOUT CONCAT2E(rfbInitTrueColourRGBTables,OUTBPP)
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#define rfbInitOneRGBTableOUT CONCAT2E(rfbInitOneRGBTable,OUTBPP)
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static void
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rfbInitOneRGBTableOUT (OUT_T *table, int inMax, int outMax, int outShift,
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int swap);
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/*
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* rfbInitTrueColourSingleTable sets up a single lookup table for truecolour
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* translation.
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*/
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static void
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rfbInitTrueColourSingleTableOUT (char **table, rfbPixelFormat *in,
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rfbPixelFormat *out)
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{
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int i;
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int inRed, inGreen, inBlue, outRed, outGreen, outBlue;
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OUT_T *t;
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int nEntries = 1 << in->bitsPerPixel;
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if (*table) free(*table);
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*table = (char *)malloc(nEntries * sizeof(OUT_T));
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if (table == NULL) return;
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t = (OUT_T *)*table;
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for (i = 0; i < nEntries; i++) {
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inRed = (i >> in->redShift) & in->redMax;
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inGreen = (i >> in->greenShift) & in->greenMax;
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inBlue = (i >> in->blueShift) & in->blueMax;
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outRed = (inRed * out->redMax + in->redMax / 2) / in->redMax;
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outGreen = (inGreen * out->greenMax + in->greenMax / 2) / in->greenMax;
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outBlue = (inBlue * out->blueMax + in->blueMax / 2) / in->blueMax;
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t[i] = ((outRed << out->redShift) |
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(outGreen << out->greenShift) |
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(outBlue << out->blueShift));
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#if (OUTBPP != 8)
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if (out->bigEndian != in->bigEndian) {
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t[i] = SwapOUT(t[i]);
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}
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#endif
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}
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}
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/*
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* rfbInitTrueColourRGBTables sets up three separate lookup tables for the
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* red, green and blue values.
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*/
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static void
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rfbInitTrueColourRGBTablesOUT (char **table, rfbPixelFormat *in,
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rfbPixelFormat *out)
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{
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OUT_T *redTable;
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OUT_T *greenTable;
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OUT_T *blueTable;
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if (*table) free(*table);
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*table = (char *)malloc((in->redMax + in->greenMax + in->blueMax + 3)
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* sizeof(OUT_T));
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redTable = (OUT_T *)*table;
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greenTable = redTable + in->redMax + 1;
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blueTable = greenTable + in->greenMax + 1;
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rfbInitOneRGBTableOUT (redTable, in->redMax, out->redMax,
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out->redShift, (out->bigEndian != in->bigEndian));
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rfbInitOneRGBTableOUT (greenTable, in->greenMax, out->greenMax,
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out->greenShift, (out->bigEndian != in->bigEndian));
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rfbInitOneRGBTableOUT (blueTable, in->blueMax, out->blueMax,
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out->blueShift, (out->bigEndian != in->bigEndian));
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}
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static void
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rfbInitOneRGBTableOUT (OUT_T *table, int inMax, int outMax, int outShift,
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int swap)
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{
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int i;
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int nEntries = inMax + 1;
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for (i = 0; i < nEntries; i++) {
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table[i] = ((i * outMax + inMax / 2) / inMax) << outShift;
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#if (OUTBPP != 8)
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if (swap) {
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table[i] = SwapOUT(table[i]);
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}
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#endif
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}
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}
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#undef OUT_T
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#undef SwapOUT
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#undef rfbInitTrueColourSingleTableOUT
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#undef rfbInitTrueColourRGBTablesOUT
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#undef rfbInitOneRGBTableOUT
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