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/////////////////////////////////////////////////////////////////////////////
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// Name: src/common/colourcmn.cpp
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// Purpose: wxColourBase implementation
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// Author: Francesco Montorsi
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// RCS-ID: $Id: colourcmn.cpp 67681 2011-05-03 16:29:04Z DS $
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// Copyright: (c) Francesco Montorsi
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#include "wx/colour.h"
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#include "wx/gdicmn.h"
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#include "wx/wxcrtvararg.h"
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IMPLEMENT_VARIANT_OBJECT_EXPORTED(wxColour,WXDLLEXPORT)
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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#if wxUSE_EXTENDED_RTTI
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template<> void wxStringReadValue(const wxString &s, wxColour &data )
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wxLogError(_("String To Colour : Incorrect colour specification : %s"),
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template<> void wxStringWriteValue(wxString &s, const wxColour &data )
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s = data.GetAsString(wxC2S_HTML_SYNTAX);
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wxTO_STRING_IMP( wxColour )
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wxFROM_STRING_IMP( wxColour )
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wxIMPLEMENT_DYNAMIC_CLASS_WITH_COPY_AND_STREAMERS_XTI( wxColour, wxObject, \
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"wx/colour.h", &wxTO_STRING( wxColour ), &wxFROM_STRING( wxColour ))
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//WX_IMPLEMENT_ANY_VALUE_TYPE(wxAnyValueTypeImpl<wxColour>)
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wxBEGIN_PROPERTIES_TABLE(wxColour)
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wxREADONLY_PROPERTY( Red, unsigned char, Red, wxEMPTY_PARAMETER_VALUE, \
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0 /*flags*/, wxT("Helpstring"), wxT("group"))
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wxREADONLY_PROPERTY( Green, unsigned char, Green, wxEMPTY_PARAMETER_VALUE, \
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0 /*flags*/, wxT("Helpstring"), wxT("group"))
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wxREADONLY_PROPERTY( Blue, unsigned char, Blue, wxEMPTY_PARAMETER_VALUE, \
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0 /*flags*/, wxT("Helpstring"), wxT("group"))
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wxEND_PROPERTIES_TABLE()
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wxDIRECT_CONSTRUCTOR_3( wxColour, unsigned char, Red, \
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unsigned char, Green, unsigned char, Blue )
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wxEMPTY_HANDLERS_TABLE(wxColour)
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#if wxCOLOUR_IS_GDIOBJECT
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wxIMPLEMENT_DYNAMIC_CLASS(wxColour, wxGDIObject)
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wxIMPLEMENT_DYNAMIC_CLASS(wxColour, wxObject)
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// ============================================================================
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// wxString <-> wxColour conversions
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// ============================================================================
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bool wxColourBase::FromString(const wxString& str)
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return false; // invalid or empty string
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if ( wxStrnicmp(str, wxT("RGB"), 3) == 0 )
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// CSS-like RGB specification
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// according to http://www.w3.org/TR/css3-color/#colorunits
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// values outside 0-255 range are allowed but should be clipped
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int red, green, blue,
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alpha = wxALPHA_OPAQUE;
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if ( str.length() > 3 && (str[3] == wxT('a') || str[3] == wxT('A')) )
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// We can't use sscanf() for the alpha value as sscanf() uses the
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// current locale while the floating point numbers in CSS always
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// use point as decimal separator, regardless of locale. So parse
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// the tail of the string manually by putting it in a buffer and
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// using wxString::ToCDouble() below. Notice that we can't use "%s"
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// for this as it stops at white space and we need "%c" to avoid
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// this and really get all the rest of the string into the buffer.
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const unsigned len = str.length(); // always big enough
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wxCharBuffer alphaBuf(len);
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char * const alphaPtr = alphaBuf.data();
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for ( unsigned n = 0; n < len; n++ )
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// Construct the format string which ensures that the last argument
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// receives all the rest of the string.
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formatStr << wxS("( %d , %d , %d , %") << len << 'c';
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// Notice that we use sscanf() here because if the string is not
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// ASCII it can't represent a valid RGB colour specification anyhow
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// and like this we can be sure that %c corresponds to "char *"
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// while with wxSscanf() it depends on the type of the string
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// passed as first argument: if it is a wide string, then %c
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// expects "wchar_t *" matching parameter under MSW for example.
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if ( sscanf(str.c_str() + 4,
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&red, &green, &blue, alphaPtr) != 4 )
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// Notice that we must explicitly specify the length to get rid of
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wxString alphaStr(alphaPtr, wxStrlen(alphaPtr));
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if ( alphaStr.empty() || alphaStr.Last() != ')' )
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alphaStr.RemoveLast();
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if ( !alphaStr.ToCDouble(&a) )
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alpha = wxRound(a * 255);
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else // no 'a' following "rgb"
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if ( wxSscanf(str.wx_str() + 3, wxT("( %d , %d , %d )"),
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&red, &green, &blue) != 3 )
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Set((unsigned char)wxClip(red, 0, 255),
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(unsigned char)wxClip(green, 0, 255),
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(unsigned char)wxClip(blue, 0, 255),
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(unsigned char)wxClip(alpha, 0, 255));
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else if ( str[0] == wxT('#') && wxStrlen(str) == 7 )
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// hexadecimal prefixed with # (HTML syntax)
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if (wxSscanf(str.wx_str() + 1, wxT("%lx"), &tmp) != 1)
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Set((unsigned char)(tmp >> 16),
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(unsigned char)(tmp >> 8),
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else if (wxTheColourDatabase) // a colour name ?
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// *this = wxTheColourDatabase->Find(str)
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// because this place can be called from constructor
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// and 'this' could not be available yet
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wxColour clr = wxTheColourDatabase->Find(str);
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Set((unsigned char)clr.Red(),
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(unsigned char)clr.Green(),
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(unsigned char)clr.Blue());
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wxLogDebug(wxT("wxColour::Set - couldn't set to colour string '%s'"), str);
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wxString wxColourBase::GetAsString(long flags) const
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const bool isOpaque = Alpha() == wxALPHA_OPAQUE;
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// we can't use the name format if the colour is not opaque as the alpha
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// information would be lost
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if ( (flags & wxC2S_NAME) && isOpaque )
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colName = wxTheColourDatabase->FindName(
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static_cast<const wxColour &>(*this)).MakeLower();
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if ( colName.empty() )
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const int red = Red(),
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if ( flags & wxC2S_CSS_SYNTAX )
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// no name for this colour; return it in CSS syntax
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colName.Printf(wxT("rgb(%d, %d, %d)"), red, green, blue);
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else // use rgba() form
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colName.Printf(wxT("rgba(%d, %d, %d, %s)"),
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wxString::FromCDouble(Alpha() / 255., 3));
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else if ( flags & wxC2S_HTML_SYNTAX )
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wxASSERT_MSG( isOpaque, "alpha is lost in HTML syntax" );
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// no name for this colour; return it in HTML syntax
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colName.Printf(wxT("#%02X%02X%02X"), red, green, blue);
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// this function should alway returns a non-empty string
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wxASSERT_MSG(!colName.empty(),
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wxT("Invalid wxColour -> wxString conversion flags"));
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void wxColourBase::MakeMono(unsigned char* r, unsigned char* g, unsigned char* b,
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*r = *g = *b = on ? 255 : 0;
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void wxColourBase::MakeGrey(unsigned char* r, unsigned char* g, unsigned char* b
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/*, unsigned char brightness */
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*r = *g = *b = (wxByte)(((*b)*117UL + (*g)*601UL + (*r)*306UL) >> 10);
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void wxColourBase::MakeGrey(unsigned char* r, unsigned char* g, unsigned char* b,
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double weight_r, double weight_g, double weight_b)
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double luma = (*r) * weight_r + (*g) * weight_g + (*b) * weight_b;
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*r = *g = *b = (wxByte)wxRound(luma);
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void wxColourBase::MakeDisabled(unsigned char* r, unsigned char* g, unsigned char* b,
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unsigned char brightness)
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//MakeGrey(r, g, b, brightness); // grey no-blend version
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*r = AlphaBlend(*r, brightness, 0.4);
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*g = AlphaBlend(*g, brightness, 0.4);
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*b = AlphaBlend(*b, brightness, 0.4);
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// AlphaBlend is used by ChangeLightness and MakeDisabled
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unsigned char wxColourBase::AlphaBlend(unsigned char fg, unsigned char bg,
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double result = bg + (alpha * (fg - bg));
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result = wxMax(result, 0.0);
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result = wxMin(result, 255.0);
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return (unsigned char)result;
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// ChangeLightness() is a utility function that simply darkens
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// or lightens a color, based on the specified percentage
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// ialpha of 0 would be completely black, 100 completely white
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// an ialpha of 100 returns the same colour
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void wxColourBase::ChangeLightness(unsigned char* r, unsigned char* g, unsigned char* b,
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if (ialpha == 100) return;
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// ialpha is 0..200 where 0 is completely black
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// and 200 is completely white and 100 is the same
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// convert that to normal alpha 0.0 - 1.0
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ialpha = wxMax(ialpha, 0);
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ialpha = wxMin(ialpha, 200);
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double alpha = ((double)(ialpha - 100.0))/100.0;
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alpha = 1.0 - alpha; // 0 = transparent fg; 1 = opaque fg
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alpha = 1.0 + alpha; // 0 = transparent fg; 1 = opaque fg
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*r = AlphaBlend(*r, bg, alpha);
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*g = AlphaBlend(*g, bg, alpha);
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*b = AlphaBlend(*b, bg, alpha);
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wxColour wxColourBase::ChangeLightness(int ialpha) const
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ChangeLightness(&r, &g, &b, ialpha);
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return wxColour(r,g,b);
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#if WXWIN_COMPATIBILITY_2_6
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wxColour wxColourBase::CreateByName(const wxString& name)
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return wxColour(name);
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void wxColourBase::InitFromName(const wxString& col)
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#endif // WXWIN_COMPATIBILITY_2_6
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// wxColour <-> wxString utilities, used by wxConfig
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wxString wxToString(const wxColourBase& col)
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return col.IsOk() ? col.GetAsString(wxC2S_CSS_SYNTAX)
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bool wxFromString(const wxString& str, wxColourBase *col)
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wxCHECK_MSG( col, false, wxT("NULL output parameter") );
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return col->Set(str);