image.h

/* SLiM - Simple Login Manager
	 Copyright (C) 2004-06 Simone Rota <sip@varlock.com>
	 Copyright (C) 2004-06 Johannes Winkelmann <jw@tks6.net>
	 Copyright (C) 2012	Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

	 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.

	 The following code has been adapted and extended from
	 xplanet 1.0.1, Copyright (C) 2002-04 Hari Nair <hari@alumni.caltech.edu>
*/

#ifndef _IMAGE_H_
#define _IMAGE_H_

#include "log.h"
#include <X11/Xlib.h>
#include <X11/Xmu/WinUtil.h>

class Image
{
public:
	Image();
	Image(const int w, const int h, const unsigned char * rgb,
		const unsigned char * alpha);

	~Image();

	const unsigned char * getPNGAlpha() const { return (png_alpha); };
	const unsigned char * getRGBData() const { return (rgb_data); };

	void getPixel(double px, double py, unsigned char * pixel);
	void getPixel(
		double px, double py, unsigned char * pixel, unsigned char * alpha);

	int Width() const { return (width); };
	int Height() const { return (height); };
	void Quality(const int q) { quality_ = q; };

	bool Read(const char * filename);

	void Reduce(const int factor);
	void Resize(const int w, const int h);
	void Merge(Image * background, const int x, const int y);
	void Merge_non_crop(Image * background, const int x, const int y);
	void Crop(const int x, const int y, const int w, const int h);
	void Tile(const int w, const int h);
	void Center(const int w, const int h, const char * hex);
	void Plain(const int w, const int h, const char * hex);

	void computeShift(unsigned long mask, unsigned char & left_shift,
		unsigned char & right_shift);

	Pixmap createPixmap(Display * dpy, int scr, Window win);

private:
	int width, height, area;
	unsigned char * rgb_data;
	unsigned char * png_alpha;

	int quality_;

	int readJpeg(
		const char * filename, int * width, int * height, unsigned char ** rgb);
	int readPng(const char * filename, int * width, int * height,
		unsigned char ** rgb, unsigned char ** alpha);
};

#endif /* _IMAGE_H_ */