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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.
*/
//
// TransImageGetter - class to perform translation between pixel formats,
// implementing the ImageGetter interface.
//
#ifndef __RFB_TRANSIMAGEGETTER_H__
#define __RFB_TRANSIMAGEGETTER_H__
#include <rfb/Rect.h>
#include <rfb/PixelFormat.h>
#include <rfb/ImageGetter.h>
namespace rfb {
typedef void (*transFnType)(void* table_,
const PixelFormat& inPF, void* inPtr,
int inStride,
const PixelFormat& outPF, void* outPtr,
int outStride, int width, int height);
class SMsgWriter;
class ColourMap;
class PixelBuffer;
class ColourCube;
class TransImageGetter : public ImageGetter {
public:
TransImageGetter(bool econ=false);
virtual ~TransImageGetter();
// init() is called to initialise the translation tables. The PixelBuffer
// argument gives the source data and format details, outPF gives the
// client's pixel format. If the client has a colour map, then the writer
// argument is used to send a SetColourMapEntries message to the client.
void init(PixelBuffer* pb, const PixelFormat& outPF, SMsgWriter* writer=0,
ColourCube* cube=0);
// setColourMapEntries() is called when the PixelBuffer has a colour map
// which has changed. firstColour and nColours specify which part of the
// colour map has changed. If nColours is 0, this means the rest of the
// colour map. The PixelBuffer previously passed to init() must have a
// valid ColourMap object. If the client also has a colour map, then the
// writer argument is used to send a SetColourMapEntries message to the
// client. If the client is true colour then instead we update the
// internal translation table - in this case the caller should also make
// sure that the client receives an update of the relevant parts of the
// framebuffer (the simplest thing to do is just update the whole
// framebuffer, though it is possible to be smarter than this).
void setColourMapEntries(int firstColour, int nColours,
SMsgWriter* writer=0);
// getImage() gets the given rectangle of data from the PixelBuffer,
// translates it into the client's pixel format and puts it in the buffer
// pointed to by the outPtr argument. The optional outStride argument can
// be used where padding is required between the output scanlines (the
// padding will be outStride-r.width() pixels).
void getImage(void* outPtr, const Rect& r, int outStride=0);
// translatePixels() translates the given number of pixels from inPtr,
// putting it into the buffer pointed to by outPtr. The pixels at inPtr
// should be in the same format as the PixelBuffer, and the translated
// pixels will be in the format previously given by the outPF argument to
// init(). Note that this call does not use the PixelBuffer's pixel data.
void translatePixels(void* inPtr, void* outPtr, int nPixels) const;
// setPixelBuffer() changes the pixel buffer to be used. The new pixel
// buffer MUST have the same pixel format as the old one - if not you
// should call init() instead.
void setPixelBuffer(PixelBuffer* pb_) { pb = pb_; }
// setOffset() sets an offset which is subtracted from the coordinates of
// the rectangle given to getImage().
void setOffset(const Point& offset_) { offset = offset_; }
private:
bool economic;
PixelBuffer* pb;
PixelFormat outPF;
rdr::U8* table;
transFnType transFn;
ColourCube* cube;
Point offset;
};
}
#endif
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