if ( str.empty() )
return false; // invalid or empty string
- if ( wxStrncmp(str, wxT("RGB"), 3) == 0 ||
- wxStrncmp(str, wxT("rgb"), 3) == 0 )
+ if ( wxStrnicmp(str, wxT("RGB"), 3) == 0 )
{
// CSS-like RGB specification
- // according to http://www.w3.org/TR/REC-CSS2/syndata.html#color-units
+ // according to http://www.w3.org/TR/css3-color/#colorunits
// values outside 0-255 range are allowed but should be clipped
- int red, green, blue;
- if (wxSscanf(str.wx_str() + 3, wxT("(%d, %d, %d)"), &red, &green, &blue) != 3)
- return false;
+ int red, green, blue,
+ alpha = wxALPHA_OPAQUE;
+ if ( str.length() > 3 && (str[3] == wxT('a') || str[3] == wxT('A')) )
+ {
+ float a;
+ // TODO: use locale-independent function
+ if ( wxSscanf(str.wx_str() + 4, wxT("( %d , %d , %d , %f )"),
+ &red, &green, &blue, &a) != 4 )
+ return false;
+
+ alpha = wxRound(a * 255);
+ }
+ else // no 'a' following "rgb"
+ {
+ if ( wxSscanf(str.wx_str() + 3, wxT("( %d , %d , %d )"),
+ &red, &green, &blue) != 3 )
+ return false;
+ }
- Set((unsigned char)wxClip(red,0,255),
- (unsigned char)wxClip(green,0,255),
- (unsigned char)wxClip(blue,0,255));
+ Set((unsigned char)wxClip(red, 0, 255),
+ (unsigned char)wxClip(green, 0, 255),
+ (unsigned char)wxClip(blue, 0, 255),
+ (unsigned char)wxClip(alpha, 0, 255));
}
else if ( str[0] == wxT('#') && wxStrlen(str) == 7 )
{
{
wxString colName;
- if (flags & wxC2S_NAME)
- colName = wxTheColourDatabase->FindName((const wxColour &)(*this)).MakeLower();
+ const bool isOpaque = Alpha() == wxALPHA_OPAQUE;
- if ( colName.empty() && (flags & wxC2S_CSS_SYNTAX) )
+ // we can't use the name format if the colour is not opaque as the alpha
+ // information would be lost
+ if ( (flags & wxC2S_NAME) && isOpaque )
{
- // no name for this colour; return it in CSS syntax
- colName.Printf(wxT("rgb(%d, %d, %d)"),
- Red(), Green(), Blue());
+ colName = wxTheColourDatabase->FindName(
+ static_cast<const wxColour &>(*this)).MakeLower();
}
- else if ( colName.empty() && (flags & wxC2S_HTML_SYNTAX) )
+
+ if ( colName.empty() )
{
- // no name for this colour; return it in HTML syntax
- colName.Printf(wxT("#%02X%02X%02X"),
- Red(), Green(), Blue());
+ const int red = Red(),
+ blue = Blue(),
+ green = Green();
+
+ if ( flags & wxC2S_CSS_SYNTAX )
+ {
+ // no name for this colour; return it in CSS syntax
+ if ( isOpaque )
+ {
+ colName.Printf(wxT("rgb(%d, %d, %d)"), red, green, blue);
+ }
+ else // use rgba() form
+ {
+ // TODO: use locale-independent function
+ colName.Printf(wxT("rgba(%d, %d, %d, %.3f)"),
+ red, green, blue, Alpha() / 255.);
+ }
+ }
+ else if ( flags & wxC2S_HTML_SYNTAX )
+ {
+ wxASSERT_MSG( isOpaque, "alpha is lost in HTML syntax" );
+
+ // no name for this colour; return it in HTML syntax
+ colName.Printf(wxT("#%02X%02X%02X"), red, green, blue);
+ }
}
- // this function always returns a non-empty string
+ // this function should alway returns a non-empty string
wxASSERT_MSG(!colName.empty(),
wxT("Invalid wxColour -> wxString conversion flags"));
return colName;
}
+// static
+void wxColourBase::MakeMono(unsigned char* r, unsigned char* g, unsigned char* b,
+ bool on)
+{
+ *r = *g = *b = on ? 255 : 0;
+}
+
+// static
+void wxColourBase::MakeGrey(unsigned char* r, unsigned char* g, unsigned char* b
+ /*, unsigned char brightness */
+ )
+{
+ *r = *g = *b = (wxByte)(((*b)*117UL + (*g)*601UL + (*r)*306UL) >> 10);
+}
+
+// static
+void wxColourBase::MakeGrey(unsigned char* r, unsigned char* g, unsigned char* b,
+ double weight_r, double weight_g, double weight_b)
+{
+ double luma = (*r) * weight_r + (*g) * weight_g + (*b) * weight_b;
+ *r = *g = *b = (wxByte)wxRound(luma);
+}
+
+// static
+void wxColourBase::MakeDisabled(unsigned char* r, unsigned char* g, unsigned char* b,
+ unsigned char brightness)
+{
+ //MakeGrey(r, g, b, brightness); // grey no-blend version
+ *r = AlphaBlend(*r, brightness, 0.4);
+ *g = AlphaBlend(*g, brightness, 0.4);
+ *b = AlphaBlend(*b, brightness, 0.4);
+}
+
+// AlphaBlend is used by ChangeLightness and MakeDisabled
+
+// static
+unsigned char wxColourBase::AlphaBlend(unsigned char fg, unsigned char bg,
+ double alpha)
+{
+ double result = bg + (alpha * (fg - bg));
+ result = wxMax(result, 0.0);
+ result = wxMin(result, 255.0);
+ return (unsigned char)result;
+}
+
+// ChangeLightness() is a utility function that simply darkens
+// or lightens a color, based on the specified percentage
+// ialpha of 0 would be completely black, 100 completely white
+// an ialpha of 100 returns the same colour
+
+// static
+void wxColourBase::ChangeLightness(unsigned char* r, unsigned char* g, unsigned char* b,
+ int ialpha)
+{
+ if (ialpha == 100) return;
+
+ // ialpha is 0..200 where 0 is completely black
+ // and 200 is completely white and 100 is the same
+ // convert that to normal alpha 0.0 - 1.0
+ ialpha = wxMax(ialpha, 0);
+ ialpha = wxMin(ialpha, 200);
+ double alpha = ((double)(ialpha - 100.0))/100.0;
+
+ unsigned char bg;
+ if (ialpha > 100)
+ {
+ // blend with white
+ bg = 255;
+ alpha = 1.0 - alpha; // 0 = transparent fg; 1 = opaque fg
+ }
+ else
+ {
+ // blend with black
+ bg = 0;
+ alpha = 1.0 + alpha; // 0 = transparent fg; 1 = opaque fg
+ }
+
+ *r = AlphaBlend(*r, bg, alpha);
+ *g = AlphaBlend(*g, bg, alpha);
+ *b = AlphaBlend(*b, bg, alpha);
+}
+
+wxColour wxColourBase::ChangeLightness(int ialpha) const
+{
+ wxByte r = Red();
+ wxByte g = Green();
+ wxByte b = Blue();
+ ChangeLightness(&r, &g, &b, ialpha);
+ return wxColour(r,g,b);
+}
+
#if WXWIN_COMPATIBILITY_2_6
// static
}
#endif // WXWIN_COMPATIBILITY_2_6
+
+// wxColour <-> wxString utilities, used by wxConfig
+wxString wxToString(const wxColourBase& col)
+{
+ return col.IsOk() ? col.GetAsString(wxC2S_CSS_SYNTAX)
+ : wxString();
+}
+
+bool wxFromString(const wxString& str, wxColourBase *col)
+{
+ wxCHECK_MSG( col, false, wxT("NULL output parameter") );
+
+ if ( str.empty() )
+ {
+ *col = wxNullColour;
+ return true;
+ }
+
+ return col->Set(str);
+}
+
+
projects / wxWidgets.git / blobdiff