/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright 2012 Torsten Hueter, torstenhtr <at> gmx.de
* Copyright 2017 Kicad Developers, see AUTHORS.txt for contributors.
*
*
* 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, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <map>
#include <gal/color4d.h>
using namespace KIGFX;
COLOR4D::COLOR4D( EDA_COLOR_T aColor )
{
if( aColor <= UNSPECIFIED_COLOR || aColor >= NBCOLORS )
{
*this = COLOR4D::UNSPECIFIED;
return;
}
r = g_ColorRefs[aColor].m_Red / 255.0;
g = g_ColorRefs[aColor].m_Green / 255.0;
b = g_ColorRefs[aColor].m_Blue / 255.0;
a = 1.0;
}
#ifdef WX_COMPATIBILITY
COLOR4D::COLOR4D( const wxColour& aColor )
{
r = aColor.Red() / 255.0;
g = aColor.Green() / 255.0;
b = aColor.Blue() / 255.0;
a = aColor.Alpha() / 255.0;
}
bool COLOR4D::SetFromWxString( const wxString& aColorString )
{
wxColour c;
if( c.Set( aColorString ) )
{
r = c.Red() / 255.0;
g = c.Green() / 255.0;
b = c.Blue() / 255.0;
a = c.Alpha() / 255.0;
return true;
}
return false;
}
wxString COLOR4D::ToWxString( long flags ) const
{
wxColour c = ToColour();
return c.GetAsString( flags );
}
COLOR4D COLOR4D::LegacyMix( COLOR4D aColor ) const
{
COLOR4D candidate;
// Blend the two colors (i.e. OR the RGB values)
candidate.r = ( (unsigned)( 255.0 * r ) | (unsigned)( 255.0 * aColor.r ) ) / 255.0,
candidate.g = ( (unsigned)( 255.0 * g ) | (unsigned)( 255.0 * aColor.g ) ) / 255.0,
candidate.b = ( (unsigned)( 255.0 * b ) | (unsigned)( 255.0 * aColor.b ) ) / 255.0,
// the alpha channel can be reinitialized
// but what is the best value?
candidate.a = ( aColor.a + a ) / 2;
return candidate;
}
COLOR4D& COLOR4D::SetToLegacyHighlightColor()
{
EDA_COLOR_T legacyColor = GetNearestLegacyColor( *this );
EDA_COLOR_T highlightColor = g_ColorRefs[legacyColor].m_LightColor;
// The alpha channel is not modified. Only R, G, B values are set,
// because legacy color does not know the alpha chanel.
r = g_ColorRefs[highlightColor].m_Red / 255.0;
g = g_ColorRefs[highlightColor].m_Green / 255.0;
b = g_ColorRefs[highlightColor].m_Blue / 255.0;
return *this;
}
COLOR4D& COLOR4D::SetToNearestLegacyColor()
{
EDA_COLOR_T legacyColor = GetNearestLegacyColor( *this );
// The alpha channel is not modified. Only R, G, B values are set,
// because legacy color does not know the alpha chanel.
r = g_ColorRefs[legacyColor].m_Red / 255.0;
g = g_ColorRefs[legacyColor].m_Green / 255.0;
b = g_ColorRefs[legacyColor].m_Blue / 255.0;
return *this;
}
unsigned int COLOR4D::ToU32() const
{
return ToColour().GetRGB();
}
void COLOR4D::FromU32( unsigned int aPackedColor )
{
wxColour c;
c.SetRGB( aPackedColor );
r = c.Red() / 255.0;
g = c.Green() / 255.0;
b = c.Blue() / 255.0;
a = c.Alpha() / 255.0;
}
EDA_COLOR_T COLOR4D::GetNearestLegacyColor( const COLOR4D &aColor )
{
// Cache layer implemented here, because all callers are using wxColour
static std::map< unsigned int, unsigned int > nearestCache;
static double hues[NBCOLORS];
static double values[NBCOLORS];
unsigned int colorInt = aColor.ToU32();
auto search = nearestCache.find( colorInt );
if( search != nearestCache.end() )
return static_cast<EDA_COLOR_T>( search->second );
// First use ColorFindNearest to check for exact matches
EDA_COLOR_T nearest = ColorFindNearest( aColor.r * 255.0, aColor.g * 255.0, aColor.b * 255.0 );
if( COLOR4D( nearest ) == aColor )
{
nearestCache.insert( std::pair< unsigned int, unsigned int >(
colorInt, static_cast<unsigned int>( nearest ) ) );
return nearest;
}
// If not, use hue and value to match.
// Hue will be NAN for grayscale colors.
// The legacy color palette is a grid across hue and value.
// We can exploit that to find a good match -- hue is most apparent to the user.
// So, first we determine the closest hue match, and then the closest value from that
// "grid row" in the legacy palette.
double h, s, v;
aColor.ToHSV( h, s, v );
double minDist = 360.0;
double legacyHue = 0.0;
if( std::isnan( h ) )
{
legacyHue = NAN;
}
else
{
for( EDA_COLOR_T candidate = ::BLACK;
candidate < NBCOLORS; candidate = NextColor( candidate ) )
{
double ch;
if( hues[candidate] == 0.0 && values[candidate] == 0.0 )
{
COLOR4D candidate4d( candidate );
double cs, cv;
candidate4d.ToHSV( ch, cs, cv );
values[candidate] = cv;
// Set the hue to non-zero for black so that we won't do this more than once
hues[candidate] = ( cv == 0.0 ) ? 1.0 : ch;
}
else
{
ch = hues[candidate];
}
if( fabs( ch - h ) < minDist )
{
minDist = fabs( ch - h );
legacyHue = ch;
}
}
}
// Now we have the desired hue; let's find the nearest value
minDist = 1.0;
for( EDA_COLOR_T candidate = ::BLACK;
candidate < NBCOLORS; candidate = NextColor( candidate ) )
{
// If the target hue is NAN, we didn't extract the value for any colors above
if( std::isnan( legacyHue ) )
{
double ch, cs, cv;
COLOR4D candidate4d( candidate );
candidate4d.ToHSV( ch, cs, cv );
values[candidate] = cv;
hues[candidate] = ( cv == 0.0 ) ? 1.0 : ch;
}
if( ( std::isnan( legacyHue ) != std::isnan( hues[candidate] ) ) || hues[candidate] != legacyHue )
continue;
if( fabs( values[candidate] - v ) < minDist )
{
minDist = fabs( values[candidate] - v );
nearest = candidate;
}
}
nearestCache.insert( std::pair< unsigned int, unsigned int >(
colorInt, static_cast<unsigned int>( nearest ) ) );
return nearest;
}
#endif
namespace KIGFX {
const bool operator==( const COLOR4D& lhs, const COLOR4D& rhs )
{
return lhs.a == rhs.a && lhs.r == rhs.r && lhs.g == rhs.g && lhs.b == rhs.b;
}
const bool operator!=( const COLOR4D& lhs, const COLOR4D& rhs )
{
return !( lhs == rhs );
}
std::ostream &operator<<( std::ostream &aStream, COLOR4D const &aColor )
{
return aStream << aColor.ToWxString( wxC2S_CSS_SYNTAX );
}
}
void COLOR4D::ToHSV( double& aOutHue, double& aOutSaturation, double& aOutValue, bool aAlwaysDefineHue ) const
{
double min, max, delta;
min = r < g ? r : g;
min = min < b ? min : b;
max = r > g ? r : g;
max = max > b ? max : b;
aOutValue = max; // value
delta = max - min;
if( max > 0.0 )
{
aOutSaturation = ( delta / max );
}
else // for black color (r = g = b = 0 ) saturation is set to 0.
{
aOutSaturation = 0.0;
aOutHue = aAlwaysDefineHue ? 0.0 : NAN;
return;
}
/* Hue in degrees (0...360) is coded according to this table
* 0 or 360 : red
* 60 : yellow
* 120 : green
* 180 : cyan
* 240 : blue
* 300 : magenta
*/
if( delta != 0.0 )
{
if( r >= max )
aOutHue = ( g - b ) / delta; // between yellow & magenta
else if( g >= max )
aOutHue = 2.0 + ( b - r ) / delta; // between cyan & yellow
else
aOutHue = 4.0 + ( r - g ) / delta; // between magenta & cyan
aOutHue *= 60.0; // degrees
if( aOutHue < 0.0 )
aOutHue += 360.0;
}
else // delta = 0 means r = g = b. hue is set to 0.0
{
aOutHue = aAlwaysDefineHue ? 0.0 : NAN;
}
}
void COLOR4D::FromHSV( double aInH, double aInS, double aInV )
{
if( aInS <= 0.0 )
{
r = aInV;
g = aInV;
b = aInV;
return;
}
double hh = aInH;
while( hh >= 360.0 )
hh -= 360.0;
/* Hue in degrees (0...360) is coded according to this table
* 0 or 360 : red
* 60 : yellow
* 120 : green
* 180 : cyan
* 240 : blue
* 300 : magenta
*/
hh /= 60.0;
int i = (int) hh;
double ff = hh - i;
double p = aInV * ( 1.0 - aInS );
double q = aInV * ( 1.0 - ( aInS * ff ) );
double t = aInV * ( 1.0 - ( aInS * ( 1.0 - ff ) ) );
switch( i )
{
case 0:
r = aInV;
g = t;
b = p;
break;
case 1:
r = q;
g = aInV;
b = p;
break;
case 2:
r = p;
g = aInV;
b = t;
break;
case 3:
r = p;
g = q;
b = aInV;
break;
case 4:
r = t;
g = p;
b = aInV;
break;
case 5:
default:
r = aInV;
g = p;
b = q;
break;
}
}
COLOR4D& COLOR4D::Saturate( double aFactor )
{
double h, s, v;
ToHSV( h, s, v );
FromHSV( h, aFactor, 1.0 );
return *this;
}
const COLOR4D COLOR4D::UNSPECIFIED( 0, 0, 0, 0 );
const COLOR4D COLOR4D::WHITE( 1, 1, 1, 1 );
const COLOR4D COLOR4D::BLACK( 0, 0, 0, 1 );