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 #ifdef __GNUG__
  12 #pragma implementation "colour.h"
  13 #endif
  14
  15 #include "wx/gdicmn.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     {
  40         m_color = data.m_color;
  41         m_colormap = data.m_colormap;
  42         m_hasPixel = data.m_hasPixel;
  43     }
  44
  45     ~wxColourRefData()
  46     {
  47         FreeColour();
  48     }
  49
  50     bool operator == (const wxColourRefData& data) const
  51     {
  52         return (m_colormap == data.m_colormap &&
  53                 m_hasPixel == data.m_hasPixel &&
  54                 m_color.red == data.m_color.red &&
  55                 m_color.green == data.m_color.green &&
  56                 m_color.blue == data.m_color.blue &&
  57                 m_color.pixel == data.m_color.pixel);
  58     }
  59
  60     void FreeColour();
  61     void AllocColour( GdkColormap* cmap );
  62
  63     GdkColor     m_color;
  64     GdkColormap *m_colormap;
  65     bool         m_hasPixel;
  66
  67     friend class wxColour;
  68
  69     // reference counter for systems with <= 8-Bit display
  70     static gushort colMapAllocCounter[ 256 ];
  71 };
  72
  73 gushort wxColourRefData::colMapAllocCounter[ 256 ] =
  74 {
  75   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  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
  88 };
  89
  90 void wxColourRefData::FreeColour()
  91 {
  92     if (m_colormap)
  93     {
  94 #ifdef __WXGTK20__
  95         if ((m_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
  96             (m_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
  97 #else
  98         GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) m_colormap;
  99         if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 100             (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 101 #endif
 102         {
 103             int idx = m_color.pixel;
 104             colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] - 1;
 105
 106             if (colMapAllocCounter[ idx ] == 0)
 107             gdk_colormap_free_colors( m_colormap, &m_color, 1 );
 108         }
 109     }
 110 }
 111
 112 void wxColourRefData::AllocColour( GdkColormap *cmap )
 113 {
 114     if (m_hasPixel && (m_colormap == cmap))
 115         return;
 116
 117     FreeColour();
 118
 119 #ifdef __WXGTK20__
 120     if ( (cmap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 121              (cmap->visual->type == GDK_VISUAL_PSEUDO_COLOR) )
 122 #else
 123     GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) cmap;
 124     if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 125         (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 126 #endif
 127     {
 128         m_hasPixel = gdk_colormap_alloc_color( cmap, &m_color, FALSE, TRUE );
 129         int idx = m_color.pixel;
 130         colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] + 1;
 131     }
 132     else
 133     {
 134         m_hasPixel = gdk_color_alloc( cmap, &m_color );
 135     }
 136     m_colormap = cmap;
 137 }
 138
 139 //-----------------------------------------------------------------------------
 140
 141 #define M_COLDATA ((wxColourRefData *)m_refData)
 142
 143 #define SHIFT (8*(sizeof(short int)-sizeof(char)))
 144
 145 IMPLEMENT_DYNAMIC_CLASS(wxColour,wxGDIObject)
 146
 147 wxColour::wxColour( unsigned char red, unsigned char green, unsigned char blue )
 148 {
 149     m_refData = new wxColourRefData();
 150     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 151     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 152     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 153     M_COLDATA->m_color.pixel = 0;
 154 }
 155
 156 void wxColour::InitFromName( const wxString &colourName )
 157 {
 158     wxNode *node = (wxNode *) NULL;
 159     if ( (wxTheColourDatabase) && (node = wxTheColourDatabase->Find(colourName)) )
 160     {
 161         wxColour *col = (wxColour*)node->Data();
 162         UnRef();
 163         if (col) Ref( *col );
 164     }
 165     else
 166     {
 167         m_refData = new wxColourRefData();
 168
 169         if (!gdk_color_parse( colourName.mb_str(), &M_COLDATA->m_color ))
 170         {
 171             // VZ: asserts are good in general but this one is triggered by
 172             //     calling wxColourDatabase::FindColour() with an
 173             //     unrecognized colour name and this can't be avoided from the
 174             //     user code, so don't give it here
 175             //
 176             //     a better solution would be to changed code in FindColour()
 177
 178             //wxFAIL_MSG( wxT("wxColour: couldn't find colour") );
 179
 180             delete m_refData;
 181             m_refData = (wxObjectRefData *) NULL;
 182         }
 183     }
 184 }
 185
 186 wxColour::~wxColour()
 187 {
 188 }
 189
 190 bool wxColour::operator == ( const wxColour& col ) const
 191 {
 192     if (m_refData == col.m_refData) return TRUE;
 193
 194     if (!m_refData || !col.m_refData) return FALSE;
 195
 196     GdkColor *own = &(((wxColourRefData*)m_refData)->m_color);
 197     GdkColor *other = &(((wxColourRefData*)col.m_refData)->m_color);
 198     if (own->red != other->red) return FALSE;
 199     if (own->blue != other->blue) return FALSE;
 200     if (own->green != other->green) return FALSE;
 201
 202     return TRUE;
 203 }
 204
 205 wxObjectRefData *wxColour::CreateRefData() const
 206 {
 207     return new wxColourRefData;
 208 }
 209
 210 wxObjectRefData *wxColour::CloneRefData(const wxObjectRefData *data) const
 211 {
 212     return new wxColourRefData(*(wxColourRefData *)data);
 213 }
 214
 215 void wxColour::Set( unsigned char red, unsigned char green, unsigned char blue )
 216 {
 217     AllocExclusive();
 218
 219     m_refData = new wxColourRefData();
 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
 226 unsigned char wxColour::Red() const
 227 {
 228     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 229
 230     return (unsigned char)(M_COLDATA->m_color.red >> SHIFT);
 231 }
 232
 233 unsigned char wxColour::Green() const
 234 {
 235     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 236
 237     return (unsigned char)(M_COLDATA->m_color.green >> SHIFT);
 238 }
 239
 240 unsigned char wxColour::Blue() const
 241 {
 242     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 243
 244     return (unsigned char)(M_COLDATA->m_color.blue >> SHIFT);
 245 }
 246
 247 void wxColour::CalcPixel( GdkColormap *cmap )
 248 {
 249     if (!Ok()) return;
 250
 251     M_COLDATA->AllocColour( cmap );
 252 }
 253
 254 int wxColour::GetPixel() const
 255 {
 256     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 257
 258     return M_COLDATA->m_color.pixel;
 259 }
 260
 261 GdkColor *wxColour::GetColor() const
 262 {
 263     wxCHECK_MSG( Ok(), (GdkColor *) NULL, wxT("invalid colour") );
 264
 265     return &M_COLDATA->m_color;
 266 }
 267
 268