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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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