src/gtk/colour.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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/gtk/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 #ifdef __WXGTK20__
  96         if ((m_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
  97             (m_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
  98 #else
  99         GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) m_colormap;
 100         if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 101             (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 102 #endif
 103         {
 104             int idx = m_color.pixel;
 105             colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] - 1;
 106
 107             if (colMapAllocCounter[ idx ] == 0)
 108                 gdk_colormap_free_colors( m_colormap, &m_color, 1 );
 109         }
 110     }
 111 }
 112
 113 void wxColourRefData::AllocColour( GdkColormap *cmap )
 114 {
 115     if (m_hasPixel && (m_colormap == cmap))
 116         return;
 117
 118     FreeColour();
 119
 120 #ifdef __WXGTK20__
 121     if ( (cmap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 122          (cmap->visual->type == GDK_VISUAL_PSEUDO_COLOR) )
 123 #else
 124     GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) cmap;
 125     if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 126         (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 127 #endif
 128     {
 129         m_hasPixel = gdk_colormap_alloc_color( cmap, &m_color, FALSE, TRUE );
 130         int idx = m_color.pixel;
 131         colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] + 1;
 132     }
 133     else
 134     {
 135         m_hasPixel = gdk_color_alloc( cmap, &m_color );
 136     }
 137     m_colormap = cmap;
 138 }
 139
 140 //-----------------------------------------------------------------------------
 141
 142 #define M_COLDATA ((wxColourRefData *)m_refData)
 143
 144 // GDK's values are in 0..65535 range, our are in 0..255
 145 #define SHIFT  8
 146
 147 IMPLEMENT_DYNAMIC_CLASS(wxColour,wxGDIObject)
 148
 149 wxColour::wxColour( unsigned char red, unsigned char green, unsigned char blue )
 150 {
 151     m_refData = new wxColourRefData();
 152     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 153     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 154     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 155     M_COLDATA->m_color.pixel = 0;
 156 }
 157
 158 /* static */
 159 wxColour wxColour::CreateByName(const wxString& name)
 160 {
 161     wxColour col;
 162
 163     GdkColor colGDK;
 164     if ( gdk_color_parse( wxGTK_CONV( name ), &colGDK ) )
 165     {
 166         wxColourRefData *refData = new wxColourRefData;
 167         refData->m_color = colGDK;
 168         col.m_refData = refData;
 169     }
 170
 171     return col;
 172 }
 173
 174
 175 void wxColour::InitFromName( const wxString &colourName )
 176 {
 177     // check the cache first
 178     wxColour col;
 179     if ( wxTheColourDatabase )
 180     {
 181         col = wxTheColourDatabase->Find(colourName);
 182     }
 183
 184     if ( !col.Ok() )
 185     {
 186         col = CreateByName(colourName);
 187     }
 188
 189     if ( col.Ok() )
 190     {
 191         *this = col;
 192     }
 193     else
 194     {
 195         wxFAIL_MSG( wxT("wxColour: couldn't find colour") );
 196     }
 197 }
 198
 199 wxColour::~wxColour()
 200 {
 201 }
 202
 203 bool wxColour::operator == ( const wxColour& col ) const
 204 {
 205     if (m_refData == col.m_refData)
 206         return true;
 207
 208     if (!m_refData || !col.m_refData)
 209         return false;
 210
 211     GdkColor *own = &(((wxColourRefData*)m_refData)->m_color);
 212     GdkColor *other = &(((wxColourRefData*)col.m_refData)->m_color);
 213     return own->red == other->red &&
 214                 own->blue == other->blue &&
 215                      own->green == other->green;
 216 }
 217
 218 wxObjectRefData *wxColour::CreateRefData() const
 219 {
 220     return new wxColourRefData;
 221 }
 222
 223 wxObjectRefData *wxColour::CloneRefData(const wxObjectRefData *data) const
 224 {
 225     return new wxColourRefData(*(wxColourRefData *)data);
 226 }
 227
 228 void wxColour::Set( unsigned char red, unsigned char green, unsigned char blue )
 229 {
 230     AllocExclusive();
 231
 232     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 233     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 234     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 235     M_COLDATA->m_color.pixel = 0;
 236
 237     M_COLDATA->m_colormap = (GdkColormap*) NULL;
 238     M_COLDATA->m_hasPixel = false;
 239 }
 240
 241 unsigned char wxColour::Red() const
 242 {
 243     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 244
 245     return (unsigned char)(M_COLDATA->m_color.red >> SHIFT);
 246 }
 247
 248 unsigned char wxColour::Green() const
 249 {
 250     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 251
 252     return (unsigned char)(M_COLDATA->m_color.green >> SHIFT);
 253 }
 254
 255 unsigned char wxColour::Blue() const
 256 {
 257     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 258
 259     return (unsigned char)(M_COLDATA->m_color.blue >> SHIFT);
 260 }
 261
 262 void wxColour::CalcPixel( GdkColormap *cmap )
 263 {
 264     if (!Ok()) return;
 265
 266     M_COLDATA->AllocColour( cmap );
 267 }
 268
 269 int wxColour::GetPixel() const
 270 {
 271     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 272
 273     return M_COLDATA->m_color.pixel;
 274 }
 275
 276 GdkColor *wxColour::GetColor() const
 277 {
 278     wxCHECK_MSG( Ok(), (GdkColor *) NULL, wxT("invalid colour") );
 279
 280     return &M_COLDATA->m_color;
 281 }