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