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/colour.h"
  19 #include "wx/gdicmn.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 // GDK's values are in 0..65535 range, our are in 0..255
 150 #define SHIFT  8
 151
 152 IMPLEMENT_DYNAMIC_CLASS(wxColour,wxGDIObject)
 153
 154 wxColour::wxColour( unsigned char red, unsigned char green, unsigned char blue )
 155 {
 156     m_refData = new wxColourRefData();
 157     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 158     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 159     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 160     M_COLDATA->m_color.pixel = 0;
 161 }
 162
 163 /* static */
 164 wxColour wxColour::CreateByName(const wxString& name)
 165 {
 166     wxColour col;
 167
 168     GdkColor colGDK;
 169     if ( gdk_color_parse( wxGTK_CONV( name ), &colGDK ) )
 170     {
 171         wxColourRefData *refData = new wxColourRefData;
 172         refData->m_color = colGDK;
 173         col.m_refData = refData;
 174     }
 175
 176     return col;
 177 }
 178
 179
 180 void wxColour::InitFromName( const wxString &colourName )
 181 {
 182     // check the cache first
 183     wxColour col;
 184     if ( wxTheColourDatabase )
 185     {
 186         col = wxTheColourDatabase->Find(colourName);
 187     }
 188
 189     if ( !col.Ok() )
 190     {
 191         col = CreateByName(colourName);
 192     }
 193
 194     if ( col.Ok() )
 195     {
 196         *this = col;
 197     }
 198     else
 199     {
 200         wxFAIL_MSG( wxT("wxColour: couldn't find colour") );
 201     }
 202 }
 203
 204 wxColour::~wxColour()
 205 {
 206 }
 207
 208 bool wxColour::operator == ( const wxColour& col ) const
 209 {
 210     if (m_refData == col.m_refData)
 211         return true;
 212
 213     if (!m_refData || !col.m_refData)
 214         return false;
 215
 216     GdkColor *own = &(((wxColourRefData*)m_refData)->m_color);
 217     GdkColor *other = &(((wxColourRefData*)col.m_refData)->m_color);
 218     return own->red == other->red &&
 219                 own->blue == other->blue &&
 220                      own->green == other->green;
 221 }
 222
 223 wxObjectRefData *wxColour::CreateRefData() const
 224 {
 225     return new wxColourRefData;
 226 }
 227
 228 wxObjectRefData *wxColour::CloneRefData(const wxObjectRefData *data) const
 229 {
 230     return new wxColourRefData(*(wxColourRefData *)data);
 231 }
 232
 233 void wxColour::Set( unsigned char red, unsigned char green, unsigned char blue )
 234 {
 235     AllocExclusive();
 236
 237     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 238     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 239     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 240     M_COLDATA->m_color.pixel = 0;
 241
 242     M_COLDATA->m_colormap = (GdkColormap*) NULL;
 243     M_COLDATA->m_hasPixel = false;
 244 }
 245
 246 unsigned char wxColour::Red() const
 247 {
 248     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 249
 250     return (unsigned char)(M_COLDATA->m_color.red >> SHIFT);
 251 }
 252
 253 unsigned char wxColour::Green() const
 254 {
 255     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 256
 257     return (unsigned char)(M_COLDATA->m_color.green >> SHIFT);
 258 }
 259
 260 unsigned char wxColour::Blue() const
 261 {
 262     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 263
 264     return (unsigned char)(M_COLDATA->m_color.blue >> SHIFT);
 265 }
 266
 267 void wxColour::CalcPixel( GdkColormap *cmap )
 268 {
 269     if (!Ok()) return;
 270
 271     M_COLDATA->AllocColour( cmap );
 272 }
 273
 274 int wxColour::GetPixel() const
 275 {
 276     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 277
 278     return M_COLDATA->m_color.pixel;
 279 }
 280
 281 GdkColor *wxColour::GetColor() const
 282 {
 283     wxCHECK_MSG( Ok(), (GdkColor *) NULL, wxT("invalid colour") );
 284
 285     return &M_COLDATA->m_color;
 286 }