Jim Evins
154 lines
2.8 KiB
C++
154 lines
2.8 KiB
C++
/* Color.h
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*
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* Copyright (C) 2011 Jim Evins <evins@snaught.com>
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*
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* This file is part of qtLabels.
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*
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* qtLabels is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* qtLabels is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with qtLabels. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef qtlabels_Color_h
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#define qtlabels_Color_h
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#include <stdint.h>
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namespace qtLabels
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{
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class Color
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{
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public:
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/* double RGBA Constructor */
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Color( double r = 0, double g = 0, double b = 0, double a = 1 )
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: m_r(r), m_g(g), m_b(b), m_a(a)
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{
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}
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static Color from_byte_rgba( uint8_t r, uint8_t g, uint8_t b, uint8_t a = 255 )
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{
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return Color( r/255.0, g/255.0, b/255.0, a/255.0 );
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}
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static Color from_legacy_color( uint32_t c )
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{
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return Color( ((c>>24) & 0xff) / 255.0,
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((c>>16) & 0xff) / 255.0,
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((c>>8) & 0xff) / 255.0,
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((c) & 0xff) / 255.0 );
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}
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static Color none()
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{
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return Color( 0, 0, 0, 0 );
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}
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static Color black()
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{
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return Color( 0, 0, 0, 1 );
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}
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static Color white()
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{
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return Color( 1, 1, 1, 1 );
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}
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/* Muliply by opacity. Create new color by applying opacity. */
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Color operator*( double opacity ) const
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{
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return Color( m_r, m_g, m_b, m_a * opacity );
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}
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uint32_t to_legacy_color()
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{
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uint32_t c = (((uint32_t)(m_r*255) & 0xff) << 24) |
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(((uint32_t)(m_g*255) & 0xff) << 16) |
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(((uint32_t)(m_b*255) & 0xff) << 8) |
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(((uint32_t)(m_a*255) & 0xff));
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return c;
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}
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bool operator==( const Color &c )
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{
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return ( (m_r == c.m_r) &&
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(m_g == c.m_g) &&
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(m_b == c.m_b) &&
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(m_a == c.m_a) );
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}
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bool operator!=( const Color &c )
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{
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return ( (m_r != c.m_r) ||
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(m_g != c.m_g) ||
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(m_b != c.m_b) ||
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(m_a != c.m_a) );
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}
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bool has_alpha()
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{
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return ( m_a != 0 );
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}
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/*
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* Red (r) Property
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*/
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double r( void ) { return m_r; }
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void r( double value ) { m_r = value; }
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/*
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* Green (g) Property
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*/
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double g( void ) { return m_g; }
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void g( double value ) { m_g = value; }
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/*
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* Blue (b) Property
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*/
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double b( void ) { return m_b; }
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void b( double value ) { m_b = value; }
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/*
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* Alpha (a) Property
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*/
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double a( void ) { return m_a; }
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void a( double value ) { m_a = value; }
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private:
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double m_r;
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double m_g;
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double m_b;
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double m_a;
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};
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}
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#endif // qtlabels_Color_h
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