86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
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/*
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* tableinitcmtemplate.c - template for initialising lookup tables for
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* translation from a colour map to true colour.
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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 a function which allocates an
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* appropriately sized lookup table and initialises it.
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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 rfbInitColourMapSingleTableOUT \
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CONCAT2E(rfbInitColourMapSingleTable,OUTBPP)
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// THIS CODE HAS BEEN MODIFIED FROM THE ORIGINAL UNIX SOURCE
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// TO WORK FOR WINVNC. THE PALETTE SHOULD REALLY BE RETRIEVED
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// FROM THE VNCDESKTOP OBJECT, RATHER THAN FROM THE OS DIRECTLY
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static void
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rfbInitColourMapSingleTableOUT (char **table,
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rfbPixelFormat *in,
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rfbPixelFormat *out)
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{
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// ALLOCATE SPACE FOR COLOUR TABLE
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int nEntries = 1 << in->bitsPerPixel;
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// Allocate the table
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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)
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{
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return;
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}
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// Obtain the system palette
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HDC hDC = GetDC(NULL);
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PALETTEENTRY palette[256];
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if (GetSystemPaletteEntries(hDC,
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0, 256, palette) == 0)
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{
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ReleaseDC(NULL, hDC);
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return;
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}
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ReleaseDC(NULL, hDC);
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// COLOUR TRANSLATION
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// We now have the colour table intact. Map it into a translation table
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int i, r, g, b;
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OUT_T *t = (OUT_T *)*table;
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for (i = 0; i < nEntries; i++)
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{
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// Split down the RGB data
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r = palette[i].peRed;
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g = palette[i].peGreen;
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b = palette[i].peBlue;
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// Now translate it
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t[i] = ((((r * out->redMax + 127) / 255) << out->redShift) |
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(((g * out->greenMax + 127) / 255) << out->greenShift) |
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(((b * out->blueMax + 127) / 255) << out->blueShift));
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#if (OUTBPP != 8)
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if (out->bigEndian != in->bigEndian)
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{
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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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#undef OUT_T
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#undef SwapOUT
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#undef rfbInitColourMapSingleTableOUT
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