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