wg_color.cpp

一个小巧的嵌入式图形系统wGUI, 可以用VC编译

// wg_color.cpp
//
// CRGBColor class
//
//
// Copyright (c) 2002 Rob Wiskow
// [e-mail]
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//


#include "wgui_include_config.h"
#include "wg_color.h"


namespace wGui
{

CRGBColor::CRGBColor(const Uint32* pColorValue, const SDL_PixelFormat* pFormat)
{
	red = static_cast<unsigned char>((pFormat->Rmask & *pColorValue) >> pFormat->Rshift);
	green = static_cast<unsigned char>((pFormat->Gmask & *pColorValue) >> pFormat->Gshift);
	blue = static_cast<unsigned char>((pFormat->Bmask & *pColorValue) >> pFormat->Bshift);
	alpha = static_cast<unsigned char>((pFormat->Amask & *pColorValue) >> pFormat->Ashift);
}


CRGBColor& CRGBColor::operator=(const CRGBColor& c)
{
	red = c.red;
	green = c.green;
	blue = c.blue;
	alpha = c.alpha;
	return *this;
}


CRGBColor CRGBColor::operator+(const CRGBColor& c) const
{
	double fg_ratio = static_cast<double>(c.alpha) / 0xFF;
	double bg_ratio = static_cast<double>(0xFF - c.alpha) / 0xFF;
	unsigned char new_red = static_cast<unsigned char>(red * bg_ratio + c.red * fg_ratio);
	unsigned char new_green = static_cast<unsigned char>(green * bg_ratio + c.green * fg_ratio);
	unsigned char new_blue = static_cast<unsigned char>(blue * bg_ratio + c.blue * fg_ratio);
	return CRGBColor(new_red, new_green, new_blue, alpha);
}


CRGBColor CRGBColor::operator|(const CRGBColor& c) const
{
	return CRGBColor(red | c.red, green | c.green, blue | c.blue, alpha | c.alpha);
}


CRGBColor CRGBColor::operator&(const CRGBColor& c) const
{
	return CRGBColor(red & c.red, green & c.green, blue & c.blue, alpha & c.alpha);
}


CRGBColor CRGBColor::operator^(const CRGBColor& c) const
{
	return CRGBColor(red ^ c.red, green ^ c.green, blue ^ c.blue, alpha ^ c.alpha);
}


CRGBColor DEFAULT_BG_COLOR = CRGBColor(0x60, 0x60, 0x60);
CRGBColor DEFAULT_FG_COLOR = CRGBColor(0xA0, 0xA0, 0xA0);
CRGBColor DEFAULT_LINE_COLOR = CRGBColor(0x00, 0x00, 0x00);
CRGBColor DEFAULT_DISABLED_LINE_COLOR = CRGBColor(0x40, 0x40, 0x40);
CRGBColor COLOR_TRANSPARENT = CRGBColor(0x00, 0x00, 0x00, 0x00);
CRGBColor COLOR_WHITE = CRGBColor(0xFF, 0xFF, 0xFF);
CRGBColor COLOR_LIGHTGRAY = CRGBColor(0xC0, 0xC0, 0xC0);
CRGBColor COLOR_GRAY = CRGBColor(0x80, 0x80, 0x80);
CRGBColor COLOR_DARKGRAY = CRGBColor(0x40, 0x40, 0x40);
CRGBColor COLOR_BLACK = CRGBColor(0x00, 0x00, 0x00);
CRGBColor COLOR_BLUE = CRGBColor(0x00, 0x00, 0xFF);
CRGBColor COLOR_RED = CRGBColor(0xFF, 0x00, 0x00);
CRGBColor COLOR_GREEN = CRGBColor(0x00, 0xFF, 0x00);
CRGBColor COLOR_YELLOW = CRGBColor(0xFF, 0xFF, 0x00);

}