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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
//
// transInitTempl.h - templates for functions to initialise lookup tables for
// the translation functions.
//
// This file is #included after having set the following macros:
// BPPOUT - 8, 16 or 32
#if !defined(BPPOUT)
#error "transInitTempl.h: BPPOUT not defined"
#endif
namespace rfb {
// CONCAT2E concatenates its arguments, expanding them if they are macros
#ifndef CONCAT2E
#define CONCAT2(a,b) a##b
#define CONCAT2E(a,b) CONCAT2(a,b)
#endif
#ifndef SWAP16
#define SWAP16(n) ((((n) & 0xff) << 8) | (((n) >> 8) & 0xff))
#endif
#ifndef SWAP32
#define SWAP32(n) (((n) >> 24) | (((n) & 0x00ff0000) >> 8) | \
(((n) & 0x0000ff00) << 8) | ((n) << 24))
#endif
#define OUTPIXEL rdr::CONCAT2E(U,BPPOUT)
#define SWAPOUT CONCAT2E(SWAP,BPPOUT)
#define initSimpleOUT CONCAT2E(initSimple,BPPOUT)
#define initRGBOUT CONCAT2E(initRGB,BPPOUT)
#define initOneRGBTableOUT CONCAT2E(initOneRGBTable,BPPOUT)
#define initOneRGBCubeTableOUT CONCAT2E(initOneRGBCubeTable,BPPOUT)
#ifndef TRANS_INIT_TEMPL_ENDIAN_TEST
#define TRANS_INIT_TEMPL_ENDIAN_TEST
static rdr::U32 endianTest = 1;
static bool nativeBigEndian = *(rdr::U8*)(&endianTest) != 1;
#endif
void initSimpleOUT (rdr::U8** tablep, const PixelFormat& inPF,
const PixelFormat& outPF)
{
if (inPF.bpp != 8 && inPF.bigEndian != nativeBigEndian)
throw Exception("Internal error: inPF is not native endian");
int size = 1 << inPF.bpp;
delete [] *tablep;
*tablep = new rdr::U8[size * sizeof(OUTPIXEL)];
OUTPIXEL* table = (OUTPIXEL*)*tablep;
for (int i = 0; i < size; i++) {
int r = (i >> inPF.redShift) & inPF.redMax;
int g = (i >> inPF.greenShift) & inPF.greenMax;
int b = (i >> inPF.blueShift) & inPF.blueMax;
r = (r * outPF.redMax + inPF.redMax/2) / inPF.redMax;
g = (g * outPF.greenMax + inPF.greenMax/2) / inPF.greenMax;
b = (b * outPF.blueMax + inPF.blueMax/2) / inPF.blueMax;
table[i] = ((r << outPF.redShift) |
(g << outPF.greenShift) |
(b << outPF.blueShift));
#if (BPPOUT != 8)
if (outPF.bigEndian != nativeBigEndian)
table[i] = SWAPOUT (table[i]);
#endif
}
}
static void initOneRGBTableOUT (OUTPIXEL* table, int inMax, int outMax,
int outShift, bool swap)
{
int size = inMax + 1;
for (int i = 0; i < size; i++) {
table[i] = ((i * outMax + inMax / 2) / inMax) << outShift;
#if (BPPOUT != 8)
if (swap)
table[i] = SWAPOUT (table[i]);
#endif
}
}
void initRGBOUT (rdr::U8** tablep, const PixelFormat& inPF,
const PixelFormat& outPF)
{
if (inPF.bpp != 8 && inPF.bigEndian != nativeBigEndian)
throw Exception("Internal error: inPF is not native endian");
int size = inPF.redMax + inPF.greenMax + inPF.blueMax + 3;
delete [] *tablep;
*tablep = new rdr::U8[size * sizeof(OUTPIXEL)];
OUTPIXEL* redTable = (OUTPIXEL*)*tablep;
OUTPIXEL* greenTable = redTable + inPF.redMax + 1;
OUTPIXEL* blueTable = greenTable + inPF.greenMax + 1;
bool swap = (outPF.bigEndian != nativeBigEndian);
initOneRGBTableOUT (redTable, inPF.redMax, outPF.redMax,
outPF.redShift, swap);
initOneRGBTableOUT (greenTable, inPF.greenMax, outPF.greenMax,
outPF.greenShift, swap);
initOneRGBTableOUT (blueTable, inPF.blueMax, outPF.blueMax,
outPF.blueShift, swap);
}
#undef OUTPIXEL
#undef initSimpleOUT
#undef initRGBOUT
#undef initOneRGBTableOUT
}
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