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
  11 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  12 #pragma implementation "colour.h"
  13 #endif
  14
  15 // For compilers that support precompilation, includes "wx.h".
  16 #include "wx/wxprec.h"
  17
  18 #include "wx/gdicmn.h"
  19 #include "wx/colour.h"
  20 #include "wx/gtk/private.h"
  21
  22 #include <gdk/gdk.h>
  23 #include <gdk/gdkx.h>
  24 #include <gdk/gdkprivate.h>
  25
  26 //-----------------------------------------------------------------------------
  27 // wxColour
  28 //-----------------------------------------------------------------------------
  29
  30 class wxColourRefData: public wxObjectRefData
  31 {
  32 public:
  33     wxColourRefData()
  34     {
  35         m_color.red = 0;
  36         m_color.green = 0;
  37         m_color.blue = 0;
  38         m_color.pixel = 0;
  39         m_colormap = (GdkColormap *) NULL;
  40         m_hasPixel = false;
  41     }
  42
  43     wxColourRefData(const wxColourRefData& data)
  44         : wxObjectRefData()
  45     {
  46         m_color = data.m_color;
  47         m_colormap = data.m_colormap;
  48         m_hasPixel = data.m_hasPixel;
  49     }
  50
  51     ~wxColourRefData()
  52     {
  53         FreeColour();
  54     }
  55
  56     bool operator == (const wxColourRefData& data) const
  57     {
  58         return (m_colormap == data.m_colormap &&
  59                 m_hasPixel == data.m_hasPixel &&
  60                 m_color.red == data.m_color.red &&
  61                 m_color.green == data.m_color.green &&
  62                 m_color.blue == data.m_color.blue &&
  63                 m_color.pixel == data.m_color.pixel);
  64     }
  65
  66     void FreeColour();
  67     void AllocColour( GdkColormap* cmap );
  68
  69     GdkColor     m_color;
  70     GdkColormap *m_colormap;
  71     bool         m_hasPixel;
  72
  73     friend class wxColour;
  74
  75     // reference counter for systems with <= 8-Bit display
  76     static gushort colMapAllocCounter[ 256 ];
  77 };
  78
  79 gushort wxColourRefData::colMapAllocCounter[ 256 ] =
  80 {
  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, 0, 0, 0, 0,
  89   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  90   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  91   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  92   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  93   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  94 };
  95
  96 void wxColourRefData::FreeColour()
  97 {
  98     if (m_colormap)
  99     {
 100 #ifdef __WXGTK20__
 101         if ((m_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 102             (m_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 103 #else
 104         GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) m_colormap;
 105         if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 106             (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 107 #endif
 108         {
 109             int idx = m_color.pixel;
 110             colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] - 1;
 111
 112             if (colMapAllocCounter[ idx ] == 0)
 113             gdk_colormap_free_colors( m_colormap, &m_color, 1 );
 114         }
 115     }
 116 }
 117
 118 void wxColourRefData::AllocColour( GdkColormap *cmap )
 119 {
 120     if (m_hasPixel && (m_colormap == cmap))
 121         return;
 122
 123     FreeColour();
 124
 125 #ifdef __WXGTK20__
 126     if ( (cmap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 127              (cmap->visual->type == GDK_VISUAL_PSEUDO_COLOR) )
 128 #else
 129     GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) cmap;
 130     if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 131         (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 132 #endif
 133     {
 134         m_hasPixel = gdk_colormap_alloc_color( cmap, &m_color, FALSE, TRUE );
 135         int idx = m_color.pixel;
 136         colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] + 1;
 137     }
 138     else
 139     {
 140         m_hasPixel = gdk_color_alloc( cmap, &m_color );
 141     }
 142     m_colormap = cmap;
 143 }
 144
 145 //-----------------------------------------------------------------------------
 146
 147 #define M_COLDATA ((wxColourRefData *)m_refData)
 148
 149 #define SHIFT (8*(sizeof(short int)-sizeof(char)))
 150
 151 IMPLEMENT_DYNAMIC_CLASS(wxColour,wxGDIObject)
 152
 153 wxColour::wxColour( unsigned char red, unsigned char green, unsigned char blue )
 154 {
 155     m_refData = new wxColourRefData();
 156     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 157     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 158     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 159     M_COLDATA->m_color.pixel = 0;
 160 }
 161
 162 /* static */
 163 wxColour wxColour::CreateByName(const wxString& name)
 164 {
 165     wxColour col;
 166
 167     GdkColor colGDK;
 168     if ( gdk_color_parse( wxGTK_CONV( name ), &colGDK ) )
 169     {
 170         wxColourRefData *refData = new wxColourRefData;
 171         refData->m_color = colGDK;
 172         col.m_refData = refData;
 173     }
 174
 175     return col;
 176 }
 177
 178
 179 void wxColour::InitFromName( const wxString &colourName )
 180 {
 181     // check the cache first
 182     wxColour col;
 183     if ( wxTheColourDatabase )
 184     {
 185         col = wxTheColourDatabase->Find(colourName);
 186     }
 187
 188     if ( !col.Ok() )
 189     {
 190         col = CreateByName(colourName);
 191     }
 192
 193     if ( col.Ok() )
 194     {
 195         *this = col;
 196     }
 197     else
 198     {
 199         wxFAIL_MSG( wxT("wxColour: couldn't find colour") );
 200     }
 201 }
 202
 203 wxColour::~wxColour()
 204 {
 205 }
 206
 207 bool wxColour::operator == ( const wxColour& col ) const
 208 {
 209     if (m_refData == col.m_refData)
 210         return true;
 211
 212     if (!m_refData || !col.m_refData)
 213         return false;
 214
 215     GdkColor *own = &(((wxColourRefData*)m_refData)->m_color);
 216     GdkColor *other = &(((wxColourRefData*)col.m_refData)->m_color);
 217     return own->red == other->red &&
 218                 own->blue == other->blue &&
 219                      own->green == other->green;
 220 }
 221
 222 wxObjectRefData *wxColour::CreateRefData() const
 223 {
 224     return new wxColourRefData;
 225 }
 226
 227 wxObjectRefData *wxColour::CloneRefData(const wxObjectRefData *data) const
 228 {
 229     return new wxColourRefData(*(wxColourRefData *)data);
 230 }
 231
 232 void wxColour::Set( unsigned char red, unsigned char green, unsigned char blue )
 233 {
 234     AllocExclusive();
 235
 236     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 237     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 238     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 239     M_COLDATA->m_color.pixel = 0;
 240
 241     M_COLDATA->m_colormap = (GdkColormap*) NULL;
 242     M_COLDATA->m_hasPixel = false;
 243 }
 244
 245 unsigned char wxColour::Red() const
 246 {
 247     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 248
 249     return (unsigned char)(M_COLDATA->m_color.red >> SHIFT);
 250 }
 251
 252 unsigned char wxColour::Green() const
 253 {
 254     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 255
 256     return (unsigned char)(M_COLDATA->m_color.green >> SHIFT);
 257 }
 258
 259 unsigned char wxColour::Blue() const
 260 {
 261     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 262
 263     return (unsigned char)(M_COLDATA->m_color.blue >> SHIFT);
 264 }
 265
 266 void wxColour::CalcPixel( GdkColormap *cmap )
 267 {
 268     if (!Ok()) return;
 269
 270     M_COLDATA->AllocColour( cmap );
 271 }
 272
 273 int wxColour::GetPixel() const
 274 {
 275     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 276
 277     return M_COLDATA->m_color.pixel;
 278 }
 279
 280 GdkColor *wxColour::GetColor() const
 281 {
 282     wxCHECK_MSG( Ok(), (GdkColor *) NULL, wxT("invalid colour") );
 283
 284     return &M_COLDATA->m_color;
 285 }
 286
 287