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/*
RGBAImage.h
Copyright (C) 2006 Yangli Hector Yee
This program 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 program 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 program;
if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _RGAIMAGE_H
#define _RGBAIMAGE_H
#include <string>
/** Class encapsulating an image containing R,G,B,A channels.
*
* Internal representation assumes data is in the ABGR format, with the RGB
* color channels premultiplied by the alpha value. Premultiplied alpha is
* often also called "associated alpha" - see the tiff 6 specification for some
* discussion - http://partners.adobe.com/asn/developer/PDFS/TN/TIFF6.pdf
*
*/
class RGBAImage
{
RGBAImage(const RGBAImage&);
RGBAImage& operator=(const RGBAImage&);
public:
RGBAImage(int w, int h, const char *name = 0)
{
Width = w;
Height = h;
if (name) Name = name;
Data = new unsigned int[w * h];
};
~RGBAImage() { if (Data) delete[] Data; }
unsigned char Get_Red(unsigned int i) { return (Data[i] & 0xFF); }
unsigned char Get_Green(unsigned int i) { return ((Data[i]>>8) & 0xFF); }
unsigned char Get_Blue(unsigned int i) { return ((Data[i]>>16) & 0xFF); }
unsigned char Get_Alpha(unsigned int i) { return ((Data[i]>>24) & 0xFF); }
void Set(unsigned char r, unsigned char g, unsigned char b, unsigned char a, unsigned int i)
{ Data[i] = r | (g << 8) | (b << 16) | (a << 24); }
int Get_Width(void) const { return Width; }
int Get_Height(void) const { return Height; }
void Set(int x, int y, unsigned int d) { Data[x + y * Width] = d; }
unsigned int Get(int x, int y) const { return Data[x + y * Width]; }
unsigned int Get(int i) const { return Data[i]; }
const std::string &Get_Name(void) const { return Name; }
RGBAImage* DownSample() const;
bool WriteToFile(const char* filename);
static RGBAImage* ReadFromFile(const char* filename);
protected:
int Width;
int Height;
std::string Name;
unsigned int *Data;
};
#endif
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