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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.
*/
//
// transTempl.h - templates for translation functions.
//
// This file is #included after having set the following macros:
// BPPIN - 8, 16 or 32
// BPPOUT - 8, 16 or 32
#if !defined(BPPIN) || !defined(BPPOUT)
#error "transTempl.h: BPPIN or BPPOUT not defined"
#endif
// 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 CONCAT4E
#define CONCAT4(a,b,c,d) a##b##c##d
#define CONCAT4E(a,b,c,d) CONCAT4(a,b,c,d)
#endif
#define INPIXEL rdr::CONCAT2E(U,BPPIN)
#define OUTPIXEL rdr::CONCAT2E(U,BPPOUT)
#define transSimpleINtoOUT CONCAT4E(transSimple,BPPIN,to,BPPOUT)
#define transRGBINtoOUT CONCAT4E(transRGB,BPPIN,to,BPPOUT)
#define transRGBCubeINtoOUT CONCAT4E(transRGBCube,BPPIN,to,BPPOUT)
#if (BPPIN <= 16)
// transSimpleINtoOUT uses a single table. This can be used for any incoming
// and outgoing pixel formats, as long as the incoming pixel format is not too
// large (for 16bpp, the table needs 64K entries).
void transSimpleINtoOUT (void* table_,
const PixelFormat& inPF, void* inPtr, int inStride,
const PixelFormat& outPF, void* outPtr, int outStride,
int width, int height)
{
OUTPIXEL* table = (OUTPIXEL*)table_;
INPIXEL* ip = (INPIXEL*)inPtr;
OUTPIXEL* op = (OUTPIXEL*)outPtr;
int inExtra = inStride - width;
int outExtra = outStride - width;
while (height > 0) {
OUTPIXEL* opEndOfRow = op + width;
while (op < opEndOfRow)
*op++ = table[*ip++];
ip += inExtra;
op += outExtra;
height--;
}
}
#endif
#if (BPPIN >= 16)
// transRGBINtoOUT uses three tables, one each for red, green and blue
// components and adds the values to produce the result. This can be used
// where a single table would be too large (e.g. 32bpp). It only works for a
// trueColour incoming pixel format. Usually the outgoing pixel format is
// trueColour, but we add rather than ORing the three values so that it is also
// possible to generate an index into a colour cube. I believe that in most
// cases adding is just as fast as ORing - if not then we should split this
// into two different functions for efficiency.
void transRGBINtoOUT (void* table,
const PixelFormat& inPF, void* inPtr, int inStride,
const PixelFormat& outPF, void* outPtr, int outStride,
int width, int height)
{
OUTPIXEL* redTable = (OUTPIXEL*)table;
OUTPIXEL* greenTable = redTable + inPF.redMax + 1;
OUTPIXEL* blueTable = greenTable + inPF.greenMax + 1;
INPIXEL* ip = (INPIXEL*)inPtr;
OUTPIXEL* op = (OUTPIXEL*)outPtr;
int inExtra = inStride - width;
int outExtra = outStride - width;
while (height > 0) {
OUTPIXEL* opEndOfRow = op + width;
while (op < opEndOfRow) {
*op++ = (redTable [(*ip >> inPF.redShift) & inPF.redMax] +
greenTable[(*ip >> inPF.greenShift) & inPF.greenMax] +
blueTable [(*ip >> inPF.blueShift) & inPF.blueMax]);
ip++;
}
ip += inExtra;
op += outExtra;
height--;
}
}
// transRGBCubeINtoOUT is similar to transRGBINtoOUT but also looks up the
// colour cube index in a fourth table to yield a pixel value.
void transRGBCubeINtoOUT (void* table,
const PixelFormat& inPF, void* inPtr, int inStride,
const PixelFormat& outPF, void* outPtr,
int outStride, int width, int height)
{
OUTPIXEL* redTable = (OUTPIXEL*)table;
OUTPIXEL* greenTable = redTable + inPF.redMax + 1;
OUTPIXEL* blueTable = greenTable + inPF.greenMax + 1;
OUTPIXEL* cubeTable = blueTable + inPF.blueMax + 1;
INPIXEL* ip = (INPIXEL*)inPtr;
OUTPIXEL* op = (OUTPIXEL*)outPtr;
int inExtra = inStride - width;
int outExtra = outStride - width;
while (height > 0) {
OUTPIXEL* opEndOfRow = op + width;
while (op < opEndOfRow) {
*op++ = cubeTable[(redTable [(*ip >> inPF.redShift) & inPF.redMax] +
greenTable[(*ip >> inPF.greenShift) & inPF.greenMax] +
blueTable [(*ip >> inPF.blueShift) & inPF.blueMax])];
ip++;
}
ip += inExtra;
op += outExtra;
height--;
}
}
#endif
#undef INPIXEL
#undef OUTPIXEL
#undef transSimpleINtoOUT
#undef transRGBINtoOUT
#undef transRGBCubeINtoOUT
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