src/gtk1/colour.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/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 #include "wx/gdicmn.h"
  15 #include "wx/gtk1/private.h"
  16
  17 #include <gdk/gdk.h>
  18 #include <gdk/gdkx.h>
  19 #include <gdk/gdkprivate.h>
  20
  21 //-----------------------------------------------------------------------------
  22 // wxColour
  23 //-----------------------------------------------------------------------------
  24
  25 class wxColourRefData: public wxObjectRefData
  26 {
  27 public:
  28     wxColourRefData()
  29     {
  30         m_color.red = 0;
  31         m_color.green = 0;
  32         m_color.blue = 0;
  33         m_color.pixel = 0;
  34         m_colormap = (GdkColormap *) NULL;
  35         m_hasPixel = false;
  36     }
  37
  38     wxColourRefData(const wxColourRefData& data)
  39         : wxObjectRefData()
  40     {
  41         m_color = data.m_color;
  42         m_colormap = data.m_colormap;
  43         m_hasPixel = data.m_hasPixel;
  44     }
  45
  46     ~wxColourRefData()
  47     {
  48         FreeColour();
  49     }
  50
  51     bool operator == (const wxColourRefData& data) const
  52     {
  53         return (m_colormap == data.m_colormap &&
  54                 m_hasPixel == data.m_hasPixel &&
  55                 m_color.red == data.m_color.red &&
  56                 m_color.green == data.m_color.green &&
  57                 m_color.blue == data.m_color.blue &&
  58                 m_color.pixel == data.m_color.pixel);
  59     }
  60
  61     void FreeColour();
  62     void AllocColour( GdkColormap* cmap );
  63
  64     GdkColor     m_color;
  65     GdkColormap *m_colormap;
  66     bool         m_hasPixel;
  67
  68     friend class wxColour;
  69
  70     // reference counter for systems with <= 8-Bit display
  71     static gushort colMapAllocCounter[ 256 ];
  72 };
  73
  74 gushort wxColourRefData::colMapAllocCounter[ 256 ] =
  75 {
  76   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  77   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  78   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  79   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  80   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  81   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  82   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  83   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  84   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  85   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  86   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  87   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  88   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  89 };
  90
  91 void wxColourRefData::FreeColour()
  92 {
  93     if (m_colormap)
  94     {
  95         GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) m_colormap;
  96         if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
  97             (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
  98         {
  99             int idx = m_color.pixel;
 100             colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] - 1;
 101
 102             if (colMapAllocCounter[ idx ] == 0)
 103                 gdk_colormap_free_colors( m_colormap, &m_color, 1 );
 104         }
 105     }
 106 }
 107
 108 void wxColourRefData::AllocColour( GdkColormap *cmap )
 109 {
 110     if (m_hasPixel && (m_colormap == cmap))
 111         return;
 112
 113     FreeColour();
 114
 115     if ( (cmap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 116          (cmap->visual->type == GDK_VISUAL_PSEUDO_COLOR) )
 117     {
 118         m_hasPixel = gdk_colormap_alloc_color( cmap, &m_color, FALSE, TRUE );
 119         int idx = m_color.pixel;
 120         colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] + 1;
 121     }
 122     else
 123     {
 124         m_hasPixel = gdk_color_alloc( cmap, &m_color );
 125     }
 126     m_colormap = cmap;
 127 }
 128
 129 //-----------------------------------------------------------------------------
 130
 131 #define M_COLDATA ((wxColourRefData *)m_refData)
 132
 133 // GDK's values are in 0..65535 range, our are in 0..255
 134 #define SHIFT  8
 135
 136 IMPLEMENT_DYNAMIC_CLASS(wxColour,wxGDIObject)
 137
 138 wxColour::wxColour( unsigned char red, unsigned char green, unsigned char blue )
 139 {
 140     m_refData = new wxColourRefData();
 141     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 142     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 143     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 144     M_COLDATA->m_color.pixel = 0;
 145 }
 146
 147 /* static */
 148 wxColour wxColour::CreateByName(const wxString& name)
 149 {
 150     wxColour col;
 151
 152     GdkColor colGDK;
 153     if ( gdk_color_parse( wxGTK_CONV( name ), &colGDK ) )
 154     {
 155         wxColourRefData *refData = new wxColourRefData;
 156         refData->m_color = colGDK;
 157         col.m_refData = refData;
 158     }
 159
 160     return col;
 161 }
 162
 163
 164 void wxColour::InitFromName( const wxString &colourName )
 165 {
 166     // check the cache first
 167     wxColour col;
 168     if ( wxTheColourDatabase )
 169     {
 170         col = wxTheColourDatabase->Find(colourName);
 171     }
 172
 173     if ( !col.Ok() )
 174     {
 175         col = CreateByName(colourName);
 176     }
 177
 178     if ( col.Ok() )
 179     {
 180         *this = col;
 181     }
 182     else
 183     {
 184         wxFAIL_MSG( wxT("wxColour: couldn't find colour") );
 185     }
 186 }
 187
 188 wxColour::~wxColour()
 189 {
 190 }
 191
 192 bool wxColour::operator == ( const wxColour& col ) const
 193 {
 194     if (m_refData == col.m_refData)
 195         return true;
 196
 197     if (!m_refData || !col.m_refData)
 198         return false;
 199
 200     GdkColor *own = &(((wxColourRefData*)m_refData)->m_color);
 201     GdkColor *other = &(((wxColourRefData*)col.m_refData)->m_color);
 202     return own->red == other->red &&
 203                 own->blue == other->blue &&
 204                      own->green == other->green;
 205 }
 206
 207 wxObjectRefData *wxColour::CreateRefData() const
 208 {
 209     return new wxColourRefData;
 210 }
 211
 212 wxObjectRefData *wxColour::CloneRefData(const wxObjectRefData *data) const
 213 {
 214     return new wxColourRefData(*(wxColourRefData *)data);
 215 }
 216
 217 void wxColour::Set( unsigned char red, unsigned char green, unsigned char blue )
 218 {
 219     AllocExclusive();
 220
 221     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 222     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 223     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 224     M_COLDATA->m_color.pixel = 0;
 225
 226     M_COLDATA->m_colormap = (GdkColormap*) NULL;
 227     M_COLDATA->m_hasPixel = false;
 228 }
 229
 230 unsigned char wxColour::Red() const
 231 {
 232     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 233
 234     return (unsigned char)(M_COLDATA->m_color.red >> SHIFT);
 235 }
 236
 237 unsigned char wxColour::Green() const
 238 {
 239     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 240
 241     return (unsigned char)(M_COLDATA->m_color.green >> SHIFT);
 242 }
 243
 244 unsigned char wxColour::Blue() const
 245 {
 246     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 247
 248     return (unsigned char)(M_COLDATA->m_color.blue >> SHIFT);
 249 }
 250
 251 void wxColour::CalcPixel( GdkColormap *cmap )
 252 {
 253     if (!Ok()) return;
 254
 255     M_COLDATA->AllocColour( cmap );
 256 }
 257
 258 int wxColour::GetPixel() const
 259 {
 260     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 261
 262     return M_COLDATA->m_color.pixel;
 263 }
 264
 265 GdkColor *wxColour::GetColor() const
 266 {
 267     wxCHECK_MSG( Ok(), (GdkColor *) NULL, wxT("invalid colour") );
 268
 269     return &M_COLDATA->m_color;
 270 }