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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.
*/
// -=- PixelBuffer.h
//
// The PixelBuffer class encapsulates the PixelFormat and dimensions
// of a block of pixel data.
#ifndef __RFB_PIXEL_BUFFER_H__
#define __RFB_PIXEL_BUFFER_H__
#include <rfb/ImageGetter.h>
#include <rfb/PixelFormat.h>
#include <rfb/ColourMap.h>
#include <rfb/Rect.h>
#include <rfb/Pixel.h>
namespace rfb {
class Region;
class PixelBuffer : public ImageGetter {
public:
PixelBuffer(const PixelFormat& pf, int width, int height, ColourMap* cm);
virtual ~PixelBuffer();
///////////////////////////////////////////////
// Format / Layout
//
// Set/get pixel format & colourmap
protected:
// Only for subclasses that support changing parameters
virtual void setPF(const PixelFormat &pf);
public:
virtual const PixelFormat &getPF() const;
virtual ColourMap* getColourMap() const;
// Get width, height and number of pixels
int width() const { return width_; }
int height() const { return height_; }
int area() const { return width_ * height_; }
// Get rectangle encompassing this buffer
// Top-left of rectangle is either at (0,0), or the specified point.
Rect getRect() const { return Rect(0, 0, width_, height_); }
Rect getRect(const Point& pos) const {
return Rect(pos, pos.translate(Point(width_, height_)));
}
///////////////////////////////////////////////
// Access to pixel data
//
// Get a pointer into the buffer
// The pointer is to the top-left pixel of the specified Rect.
// The buffer stride (in pixels) is returned.
virtual const rdr::U8* getPixelsR(const Rect& r, int* stride) = 0;
virtual rdr::U8* getPixelsRW(const Rect& r, int* stride) = 0;
// Get pixel data for a given part of the buffer
// Data is copied into the supplied buffer, with the specified
// stride.
virtual void getImage(void* imageBuf, const Rect& r, int stride=0);
///////////////////////////////////////////////
// Framebuffer update methods
//
// Ensure that the specified rectangle of buffer is up to date.
// Overridden by derived classes implementing framebuffer access
// to copy the required display data into place.
virtual void grabRegion(const Region& region) {}
protected:
PixelBuffer();
PixelFormat format;
int width_, height_;
ColourMap* colourmap;
};
// FullFramePixelBuffer
class FullFramePixelBuffer : public PixelBuffer {
public:
FullFramePixelBuffer(const PixelFormat& pf, int width, int height,
rdr::U8* data_, ColourMap* cm);
virtual ~FullFramePixelBuffer();
protected:
virtual void setPF(const PixelFormat &pf);
public:
// - Get the number of pixels per row in the actual pixel buffer data area
// This may in some cases NOT be the same as width().
virtual int getStride() const;
// Get a pointer to specified pixel data
rdr::U8* getPixelsRW(const Rect& r, int* stride);
virtual const rdr::U8* getPixelsR(const Rect& r, int* stride) {
return getPixelsRW(r, stride);
}
///////////////////////////////////////////////
// Basic rendering operations
// These operations DO NOT clip to the pixelbuffer area, or trap overruns.
// Fill a rectangle
virtual void fillRect(const Rect &dest, Pixel pix);
// Copy pixel data to the buffer
virtual void imageRect(const Rect &dest, const void* pixels, int stride=0);
// Copy pixel data from one PixelBuffer location to another
virtual void copyRect(const Rect &dest, const Point &move_by_delta);
// Copy pixel data to the buffer through a mask
// pixels is a pointer to the pixel to be copied to r.tl.
// maskPos specifies the pixel offset in the mask to start from.
// mask_ is a pointer to the mask bits at (0,0).
// pStride and mStride are the strides of the pixel and mask buffers.
virtual void maskRect(const Rect& r, const void* pixels, const void* mask_);
// pixel is the Pixel value to be used where mask_ is set
virtual void maskRect(const Rect& r, Pixel pixel, const void* mask_);
// *** Should this be visible?
rdr::U8* data;
protected:
FullFramePixelBuffer();
void (*fillRectFn)(rdr::U8 *, int, const Rect&, Pixel);
};
// -=- Managed pixel buffer class
// Automatically allocates enough space for the specified format & area
class ManagedPixelBuffer : public FullFramePixelBuffer {
public:
ManagedPixelBuffer();
ManagedPixelBuffer(const PixelFormat& pf, int width, int height);
virtual ~ManagedPixelBuffer();
// Manage the pixel buffer layout
virtual void setPF(const PixelFormat &pf);
virtual void setSize(int w, int h);
// Assign a colour map to the buffer
virtual void setColourMap(ColourMap* cm, bool own_cm);
// Return the total number of bytes of pixel data in the buffer
int dataLen() const { return width_ * height_ * (format.bpp/8); }
protected:
unsigned long datasize;
bool own_colourmap;
void checkDataSize();
};
};
#endif // __RFB_PIXEL_BUFFER_H__
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