libreoffice/tools/source/generic/color.cxx

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <stdlib.h>

#include <tools/color.hxx>
#include <tools/debug.hxx>
#include <tools/stream.hxx>
#include <tools/rc.hxx>
#include <tools/rcid.h>
#include <tools/resid.hxx>
#include <tools/rc.h>

static inline long _FRound( double fVal )
{
    return( fVal > 0.0 ? (long) ( fVal + 0.5 ) : -(long) ( -fVal + 0.5 ) );
}

Color::Color( const ResId& rResId )
{
    rResId.SetRT( RSC_COLOR );
    ResMgr* pResMgr = rResId.GetResMgr();
    if ( pResMgr && pResMgr->GetResource( rResId ) )
    {
        // Header ueberspringen
        pResMgr->Increment( sizeof( RSHEADER_TYPE ) );

        // Daten laden
        sal_uInt16 nRed     = pResMgr->ReadShort();
        sal_uInt16 nGreen   = pResMgr->ReadShort();
        sal_uInt16 nBlue    = pResMgr->ReadShort();
        // one more historical sal_uIntPtr
        pResMgr->ReadLong();

        // RGB-Farbe
        mnColor = RGB_COLORDATA( nRed>>8, nGreen>>8, nBlue>>8 );
    }
    else
    {
        mnColor = RGB_COLORDATA( 0, 0, 0 );
    }
}

sal_uInt8 Color::GetColorError( const Color& rCompareColor ) const
{
    const long nErrAbs = labs( (long) rCompareColor.GetRed() - GetRed() ) +
                         labs( (long) rCompareColor.GetGreen() - GetGreen() ) +
                         labs( (long) rCompareColor.GetBlue() - GetBlue() );

    return (sal_uInt8) _FRound( nErrAbs * 0.3333333333 );
}

void Color::IncreaseLuminance( sal_uInt8 cLumInc )
{
    SetRed( (sal_uInt8) SAL_BOUND( (long) COLORDATA_RED( mnColor ) + cLumInc, 0L, 255L ) );
    SetGreen( (sal_uInt8) SAL_BOUND( (long) COLORDATA_GREEN( mnColor ) + cLumInc, 0L, 255L ) );
    SetBlue( (sal_uInt8) SAL_BOUND( (long) COLORDATA_BLUE( mnColor ) + cLumInc, 0L, 255L ) );
}

void Color::DecreaseLuminance( sal_uInt8 cLumDec )
{
    SetRed( (sal_uInt8) SAL_BOUND( (long) COLORDATA_RED( mnColor ) - cLumDec, 0L, 255L ) );
    SetGreen( (sal_uInt8) SAL_BOUND( (long) COLORDATA_GREEN( mnColor ) - cLumDec, 0L, 255L ) );
    SetBlue( (sal_uInt8) SAL_BOUND( (long) COLORDATA_BLUE( mnColor ) - cLumDec, 0L, 255L ) );
}

void Color::DecreaseContrast( sal_uInt8 cContDec )
{
    if( cContDec )
    {
        const double fM = ( 128.0 - 0.4985 * cContDec ) / 128.0;
        const double fOff = 128.0 - fM * 128.0;

        SetRed( (sal_uInt8) SAL_BOUND( _FRound( COLORDATA_RED( mnColor ) * fM + fOff ), 0L, 255L ) );
        SetGreen( (sal_uInt8) SAL_BOUND( _FRound( COLORDATA_GREEN( mnColor ) * fM + fOff ), 0L, 255L ) );
        SetBlue( (sal_uInt8) SAL_BOUND( _FRound( COLORDATA_BLUE( mnColor ) * fM + fOff ), 0L, 255L ) );
    }
}

void Color::Invert()
{
    SetRed( ~COLORDATA_RED( mnColor ) );
    SetGreen( ~COLORDATA_GREEN( mnColor ) );
    SetBlue( ~COLORDATA_BLUE( mnColor ) );
}

sal_Bool Color::IsDark() const
{
    return GetLuminance() <= 38;
}

sal_Bool Color::IsBright() const
{
    return GetLuminance() >= 245;
}

// color space conversion

void Color::RGBtoHSB( sal_uInt16& nHue, sal_uInt16& nSat, sal_uInt16& nBri ) const
{
    sal_uInt8 c[3];
    sal_uInt8 cMax, cMin;

    c[0] = GetRed();
    c[1] = GetGreen();
    c[2] = GetBlue();

    cMax = c[0];
    if( c[1] > cMax )
        cMax = c[1];
    if( c[2] > cMax )
        cMax = c[2];

    // Brightness = max(R, G, B);
    nBri = cMax * 100 / 255;

    cMin = c[0];
    if( c[1] < cMin )
        cMin = c[1];
    if( c[2] < cMin )
        cMin = c[2];

    sal_uInt8 cDelta = cMax - cMin;

    // Saturation = max - min / max
    if( nBri > 0 )
        nSat = cDelta * 100 / cMax;
    else
        nSat = 0;

    if( nSat == 0 )
        nHue = 0; // Default = undefined
    else
    {
        double dHue = 0.0;

        if( c[0] == cMax )
        {
            dHue = (double)( c[1] - c[2] ) / (double)cDelta;
        }
        else if( c[1] == cMax )
        {
            dHue = 2.0 + (double)( c[2] - c[0] ) / (double)cDelta;
        }
        else if ( c[2] == cMax )
        {
            dHue = 4.0 + (double)( c[0] - c[1] ) / (double)cDelta;
        }
        dHue *= 60.0;

        if( dHue < 0.0 )
            dHue += 360.0;

        nHue = (sal_uInt16) dHue;
    }
}

ColorData Color::HSBtoRGB( sal_uInt16 nHue, sal_uInt16 nSat, sal_uInt16 nBri )
{
    sal_uInt8 cR=0,cG=0,cB=0;
    sal_uInt8 nB = (sal_uInt8) ( nBri * 255 / 100 );

    if( nSat == 0 )
    {
        cR = nB;
        cG = nB;
        cB = nB;
    }
    else
    {
        double dH = nHue;
        double f;
        sal_uInt16 n;
        if( dH == 360.0 )
            dH = 0.0;

        dH /= 60.0;
        n = (sal_uInt16) dH;
        f = dH - n;

        sal_uInt8 a = (sal_uInt8) ( nB * ( 100 - nSat ) / 100 );
        sal_uInt8 b = (sal_uInt8) ( nB * ( 100 - ( (double)nSat * f ) ) / 100 );
        sal_uInt8 c = (sal_uInt8) ( nB * ( 100 - ( (double)nSat * ( 1.0 - f ) ) ) / 100 );

        switch( n )
        {
            case 0: cR = nB;    cG = c;     cB = a;     break;
            case 1: cR = b;     cG = nB;    cB = a;     break;
            case 2: cR = a;     cG = nB;    cB = c;     break;
            case 3: cR = a;     cG = b;     cB = nB;    break;
            case 4: cR = c;     cG = a;     cB = nB;    break;
            case 5: cR = nB;    cG = a;     cB = b;     break;
        }
    }

    return RGB_COLORDATA( cR, cG, cB );
}

SvStream& Color::Read( SvStream& rIStm, sal_Bool bNewFormat )
{
    if ( bNewFormat )
        rIStm >> mnColor;
    else
        rIStm >> *this;

    return rIStm;
}

SvStream& Color::Write( SvStream& rOStm, sal_Bool bNewFormat )
{
    if ( bNewFormat )
        rOStm << mnColor;
    else
        rOStm << *this;

    return rOStm;
}

#define COL_NAME_USER       ((sal_uInt16)0x8000)

SvStream& operator>>( SvStream& rIStream, Color& rColor )
{
    DBG_ASSERTWARNING( rIStream.GetVersion(), "Color::>> - Solar-Version not set on rIStream" );

    sal_uInt16      nColorName;

    rIStream >> nColorName;

    if ( nColorName & COL_NAME_USER )
    {
        sal_uInt16 nRed;
        sal_uInt16 nGreen;
        sal_uInt16 nBlue;

        rIStream >> nRed;
        rIStream >> nGreen;
        rIStream >> nBlue;

        rColor.mnColor = RGB_COLORDATA( nRed>>8, nGreen>>8, nBlue>>8 );
    }
    else
    {
        static ColorData aColAry[] =
        {
            COL_BLACK,                          // COL_BLACK
            COL_BLUE,                           // COL_BLUE
            COL_GREEN,                          // COL_GREEN
            COL_CYAN,                           // COL_CYAN
            COL_RED,                            // COL_RED
            COL_MAGENTA,                        // COL_MAGENTA
            COL_BROWN,                          // COL_BROWN
            COL_GRAY,                           // COL_GRAY
            COL_LIGHTGRAY,                      // COL_LIGHTGRAY
            COL_LIGHTBLUE,                      // COL_LIGHTBLUE
            COL_LIGHTGREEN,                     // COL_LIGHTGREEN
            COL_LIGHTCYAN,                      // COL_LIGHTCYAN
            COL_LIGHTRED,                       // COL_LIGHTRED
            COL_LIGHTMAGENTA,                   // COL_LIGHTMAGENTA
            COL_YELLOW,                         // COL_YELLOW
            COL_WHITE,                          // COL_WHITE
            COL_WHITE,                          // COL_MENUBAR
            COL_BLACK,                          // COL_MENUBARTEXT
            COL_WHITE,                          // COL_POPUPMENU
            COL_BLACK,                          // COL_POPUPMENUTEXT
            COL_BLACK,                          // COL_WINDOWTEXT
            COL_WHITE,                          // COL_WINDOWWORKSPACE
            COL_BLACK,                          // COL_HIGHLIGHT
            COL_WHITE,                          // COL_HIGHLIGHTTEXT
            COL_BLACK,                          // COL_3DTEXT
            COL_LIGHTGRAY,                      // COL_3DFACE
            COL_WHITE,                          // COL_3DLIGHT
            COL_GRAY,                           // COL_3DSHADOW
            COL_LIGHTGRAY,                      // COL_SCROLLBAR
            COL_WHITE,                          // COL_FIELD
            COL_BLACK                           // COL_FIELDTEXT
        };

        if ( nColorName < (sizeof( aColAry )/sizeof(ColorData)) )
            rColor.mnColor = aColAry[nColorName];
        else
            rColor.mnColor = COL_BLACK;
    }

    return rIStream;
}

SvStream& operator<<( SvStream& rOStream, const Color& rColor )
{
    DBG_ASSERTWARNING( rOStream.GetVersion(), "Color::<< - Solar-Version not set on rOStream" );

    sal_uInt16 nColorName   = COL_NAME_USER;
    sal_uInt16 nRed         = rColor.GetRed();
    sal_uInt16 nGreen       = rColor.GetGreen();
    sal_uInt16 nBlue        = rColor.GetBlue();
    nRed    = (nRed<<8) + nRed;
    nGreen  = (nGreen<<8) + nGreen;
    nBlue   = (nBlue<<8) + nBlue;

    rOStream << nColorName;
    rOStream << nRed;
    rOStream << nGreen;
    rOStream << nBlue;

    return rOStream;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */