src/gtk/colour.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/colour.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #include "wx/colour.h"
  14
  15 #include "wx/gtk/private.h"
  16
  17 #include <gdk/gdk.h>
  18
  19 //-----------------------------------------------------------------------------
  20 // wxColour
  21 //-----------------------------------------------------------------------------
  22
  23 class wxColourRefData : public wxGDIRefData
  24 {
  25 public:
  26     wxColourRefData(guint16 red, guint16 green, guint16 blue, wxByte alpha = 0xff)
  27     {
  28         m_color.red =
  29         m_red = red;
  30         m_color.green =
  31         m_green = green;
  32         m_color.blue =
  33         m_blue = blue;
  34         m_alpha = alpha;
  35         m_color.pixel = 0;
  36         m_colormap = NULL;
  37     }
  38
  39     virtual ~wxColourRefData()
  40     {
  41         FreeColour();
  42     }
  43
  44     void FreeColour();
  45     void AllocColour( GdkColormap* cmap );
  46
  47     GdkColor     m_color;
  48     GdkColormap *m_colormap;
  49     // gdk_colormap_alloc_color may change the RGB values in m_color, so we need separate copies
  50     guint16 m_red;
  51     guint16 m_green;
  52     guint16 m_blue;
  53     wxByte m_alpha;
  54
  55     wxDECLARE_NO_COPY_CLASS(wxColourRefData);
  56 };
  57
  58 void wxColourRefData::FreeColour()
  59 {
  60     if (m_colormap)
  61     {
  62         gdk_colormap_free_colors(m_colormap, &m_color, 1);
  63         m_colormap = NULL;
  64         m_color.pixel = 0;
  65     }
  66 }
  67
  68 void wxColourRefData::AllocColour( GdkColormap *cmap )
  69 {
  70     if (m_colormap != cmap)
  71     {
  72         FreeColour();
  73
  74         m_color.red = m_red;
  75         m_color.green = m_green;
  76         m_color.blue = m_blue;
  77         if (gdk_colormap_alloc_color(cmap, &m_color, FALSE, TRUE))
  78         {
  79             m_colormap = cmap;
  80         }
  81     }
  82 }
  83
  84 //-----------------------------------------------------------------------------
  85
  86 #define M_COLDATA static_cast<wxColourRefData*>(m_refData)
  87
  88 // GDK's values are in 0..65535 range, ours are in 0..255
  89 #define SHIFT  8
  90
  91 wxColour::wxColour(const GdkColor& gdkColor)
  92 {
  93     m_refData = new wxColourRefData(gdkColor.red, gdkColor.green, gdkColor.blue);
  94 }
  95
  96 wxColour::~wxColour()
  97 {
  98 }
  99
 100 bool wxColour::operator == ( const wxColour& col ) const
 101 {
 102     if (m_refData == col.m_refData)
 103         return true;
 104
 105     if (!m_refData || !col.m_refData)
 106         return false;
 107
 108     wxColourRefData* refData = M_COLDATA;
 109     wxColourRefData* that_refData = static_cast<wxColourRefData*>(col.m_refData);
 110     return refData->m_red == that_refData->m_red &&
 111            refData->m_green == that_refData->m_green &&
 112            refData->m_blue == that_refData->m_blue &&
 113            refData->m_alpha == that_refData->m_alpha;
 114 }
 115
 116 void wxColour::InitRGBA(unsigned char red, unsigned char green, unsigned char blue,
 117                         unsigned char alpha)
 118 {
 119     UnRef();
 120
 121     m_refData = new wxColourRefData(
 122         (guint16(red) << SHIFT) + red,
 123         (guint16(green) << SHIFT) + green,
 124         (guint16(blue) << SHIFT) + blue,
 125         alpha);
 126 }
 127
 128 unsigned char wxColour::Red() const
 129 {
 130     wxCHECK_MSG( IsOk(), 0, wxT("invalid colour") );
 131
 132     return wxByte(M_COLDATA->m_red >> SHIFT);
 133 }
 134
 135 unsigned char wxColour::Green() const
 136 {
 137     wxCHECK_MSG( IsOk(), 0, wxT("invalid colour") );
 138
 139     return wxByte(M_COLDATA->m_green >> SHIFT);
 140 }
 141
 142 unsigned char wxColour::Blue() const
 143 {
 144     wxCHECK_MSG( IsOk(), 0, wxT("invalid colour") );
 145
 146     return wxByte(M_COLDATA->m_blue >> SHIFT);
 147 }
 148
 149 unsigned char wxColour::Alpha() const
 150 {
 151     wxCHECK_MSG( IsOk(), 0, wxT("invalid colour") );
 152
 153     return M_COLDATA->m_alpha;
 154 }
 155
 156 void wxColour::CalcPixel( GdkColormap *cmap )
 157 {
 158     if (!IsOk()) return;
 159
 160     M_COLDATA->AllocColour( cmap );
 161 }
 162
 163 int wxColour::GetPixel() const
 164 {
 165     wxCHECK_MSG( IsOk(), 0, wxT("invalid colour") );
 166
 167     return M_COLDATA->m_color.pixel;
 168 }
 169
 170 const GdkColor *wxColour::GetColor() const
 171 {
 172     wxCHECK_MSG( IsOk(), NULL, wxT("invalid colour") );
 173
 174     return &M_COLDATA->m_color;
 175 }
 176
 177 bool wxColour::FromString(const wxString& str)
 178 {
 179     GdkColor colGDK;
 180     if ( gdk_color_parse( wxGTK_CONV_SYS( str ), &colGDK ) )
 181     {
 182         *this = wxColour(colGDK);
 183         return true;
 184     }
 185
 186     return wxColourBase::FromString(str);
 187 }