fluxbox/src/FbTk/Color.cc

// Color.cc for Fluxbox window manager
// Copyright (c) 2002 Henrik Kinnunen (fluxgen@users.sourceforge.net)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

// $Id: Color.cc,v 1.2 2002/11/28 19:22:40 fluxgen Exp $

#include "Color.hh"

#include "App.hh"

#include <iostream>
using namespace std;

namespace {
unsigned char maxValue(unsigned short colval) {
	if (colval == 65535) 
		return 0xFF;

	return static_cast<unsigned char>(colval/0xFF);
}

};

namespace FbTk {

Color::Color():
m_allocated(false),
m_screen(0) {

}

Color::Color(const Color &col_copy) {
	copy(col_copy);
}

Color::Color(unsigned char red, unsigned char green, unsigned char blue, int screen):
m_red(red),	m_green(green), m_blue(blue), 
m_pixel(0), m_allocated(false),
m_screen(screen) { 
	allocate(red, green, blue, screen);
}

Color::Color(const char *color_string, int screen):
m_allocated(false),
m_screen(screen) {
	setFromString(color_string, screen);
}

Color::~Color() {
	free();
}

bool Color::setFromString(const char *color_string, int screen) {

	if (color_string == 0) {
		free();
		return false;
	}

	Display *disp = App::instance()->display();
	Colormap colm = DefaultColormap(disp, screen);

	XColor color;

	if (! XParseColor(disp, colm, color_string, &color)) {
		cerr<<"FbTk::Color: Parse color error: \""<<color_string<<"\""<<endl;
		return false;
	} else if (! XAllocColor(disp, colm, &color)) {
		cerr<<"FbTk::Color: Allocation error: \""<<color_string<<"\""<<endl;
		return false;
	}



	setPixel(color.pixel);
	setRGB(maxValue(color.red), 
		maxValue(color.green),
		maxValue(color.blue));
	setAllocated(true);
	m_screen = screen;

	return true;
}

/*
Color &Color::Color::operator  = (const Color &col_copy) {
	// check for aliasing
	if (this == &col_copy)
		return *this;

	copy(col_copy);
	return *this;
}
*/

void Color::free() {
	if (isAllocated()) {
		unsigned long pixel = m_pixel;
		Display *disp = App::instance()->display();
		XFreeColors(disp, DefaultColormap(disp, m_screen), &pixel, 1, 0);
		setPixel(0);
		setRGB(0, 0, 0);
		setAllocated(false);
	}	
}

void Color::copy(const Color &col_copy) {
	if (!col_copy.isAllocated()) {
		free();
		setRGB(col_copy.red(), col_copy.green(), col_copy.blue());
		setPixel(col_copy.pixel());
		return;
	}

	free();
		
	allocate(col_copy.red(), 
		col_copy.green(),
		col_copy.blue(),
		col_copy.m_screen);
	
}

void Color::allocate(unsigned char red, unsigned char green, unsigned char blue, int screen) {

	Display *disp = App::instance()->display();
	XColor color;
	// fill xcolor structure
	color.red = red;
	color.green = green;	
	color.blue = blue;
	
	
	if (!XAllocColor(disp, DefaultColormap(disp, screen), &color)) {
		cerr<<"FbTk::Color: Allocation error."<<endl;
	} else {
		setRGB(maxValue(color.red),
			maxValue(color.green),
			maxValue(color.blue));
		setPixel(color.pixel);
		setAllocated(true);
	}
	
	m_screen = screen;
}

void Color::setRGB(unsigned char red, unsigned char green, unsigned char blue) {
	m_red = red;
	m_green = green;
	m_blue = blue;
}

};