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/* Copyright (C) 2005 TightVNC Team. 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.
*/
// -=- ScaledPixelBuffer.h
//
// The ScaledPixelBuffer class allows to scale the image data
// from the source buffer to destination buffer using bilinear
// interpolation.
#ifndef __RFB_SCALEDPIXELBUFFER_H__
#define __RFB_SCALEDPIXELBUFFER_H__
#include <rdr/types.h>
#include <rdr/Exception.h>
#include <rfb/Rect.h>
#include <rfb/PixelFormat.h>
#include <rfb/ScaleFilters.h>
using namespace rdr;
namespace rfb {
struct UnsupportedPixelFormatException : public Exception {
UnsupportedPixelFormatException(const char* s="Now supported only true colour pixel data in the scaling mode.")
: Exception(s) {}
};
class ScaledPixelBuffer {
public:
ScaledPixelBuffer(U8 **data, int width, int height, int scale, PixelFormat pf);
ScaledPixelBuffer();
virtual ~ScaledPixelBuffer();
// Get width, height, number of pixels and scale
int width() const { return scaled_width; }
int height() const { return scaled_height; }
int getSrcWidth() const { return src_width; }
int getSrcHeight() const { return src_height; }
int area() const { return scaled_width * scaled_height; }
int getScale() const { return scale; }
double getScaleRatioX() const { return scale_ratio_x; }
double getScaleRatioY() const { return scale_ratio_y; }
// Pixel manipulation routines
inline U32 getSourcePixel(int x, int y);
// 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, scaled_width, scaled_height); }
Rect getRect(const Point& pos) const {
return Rect(pos, pos.translate(Point(scaled_width, scaled_height)));
}
// Set the new source buffer and its parameters
void setSourceBuffer(U8 **src_data, int w, int h);
void setScaledBuffer(U8 **scaled_data_) {
scaled_data = scaled_data_;
};
// Set the new pixel format
void setPF(const PixelFormat &pf);
// Set the new scale, in percent
virtual void setScale(int scale);
// Set/get the scale method
virtual void setScaleFilter(unsigned int scaleFilterID);
unsigned int getScaleFilterID() const { return scaleFilterID; }
// Scale rect from the source image buffer to the destination buffer
// using the current interpolation method
virtual void scaleRect(const Rect& r);
// Calculate the scaled image rectangle which depend on the source
// image rectangle.
Rect calculateScaleBoundary(const Rect& r);
protected:
// Calculate the scaled buffer size depending on the source buffer
// parameters (width, height, pixel format)
virtual void calculateScaledBufferSize();
// Free the weight tabs for x and y
virtual void freeWeightTabs();
// Recreates the row accumulators.
virtual void recreateRowAccum();
int src_width;
int src_height;
int scaled_width;
int scaled_height;
int scale;
double scale_ratio_x;
double scale_ratio_y;
PixelFormat pf;
unsigned int scaleFilterID;
ScaleFilters scaleFilters;
SFilterWeightTab *xWeightTabs;
SFilterWeightTab *yWeightTabs;
int *raccum;
int *gaccum;
int *baccum;
U8 **src_data;
U8 **scaled_data;
};
};
#endif
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