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()
  39     {
  40         FreeColour();
  41     }
  42
  43     bool operator == (const wxColourRefData& data) const
  44     {
  45         return (m_colormap == data.m_colormap &&
  46                 m_hasPixel == data.m_hasPixel &&
  47                 m_color.red == data.m_color.red &&
  48                 m_color.green == data.m_color.green &&
  49                 m_color.blue == data.m_color.blue &&
  50                 m_color.pixel == data.m_color.pixel);
  51     }
  52
  53     void FreeColour();
  54     void AllocColour( GdkColormap* cmap );
  55
  56     GdkColor     m_color;
  57     GdkColormap *m_colormap;
  58     bool         m_hasPixel;
  59
  60     friend class wxColour;
  61
  62     // reference counter for systems with <= 8-Bit display
  63     static gushort colMapAllocCounter[ 256 ];
  64 };
  65
  66 gushort wxColourRefData::colMapAllocCounter[ 256 ] =
  67 {
  68   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  69   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  70   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  71   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  72   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  73   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  74   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  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
  81 };
  82
  83 void wxColourRefData::FreeColour()
  84 {
  85     if (m_colormap)
  86     {
  87 #ifdef __WXGTK20__
  88         if ((m_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
  89             (m_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
  90 #else
  91         GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) m_colormap;
  92         if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
  93             (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
  94 #endif
  95         {
  96             int idx = m_color.pixel;
  97             colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] - 1;
  98
  99             if (colMapAllocCounter[ idx ] == 0)
 100             gdk_colormap_free_colors( m_colormap, &m_color, 1 );
 101         }
 102     }
 103 }
 104
 105 void wxColourRefData::AllocColour( GdkColormap *cmap )
 106 {
 107     if (m_hasPixel && (m_colormap == cmap))
 108         return;
 109
 110     FreeColour();
 111
 112 #ifdef __WXGTK20__
 113     if ((m_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 114         (m_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 115 #else
 116     GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) cmap;
 117     if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 118         (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 119 #endif
 120     {
 121         m_hasPixel = gdk_colormap_alloc_color( cmap, &m_color, FALSE, TRUE );
 122         int idx = m_color.pixel;
 123         colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] + 1;
 124     }
 125     else
 126     {
 127         m_hasPixel = gdk_color_alloc( cmap, &m_color );
 128     }
 129     m_colormap = cmap;
 130 }
 131
 132 //-----------------------------------------------------------------------------
 133
 134 #define M_COLDATA ((wxColourRefData *)m_refData)
 135
 136 #define SHIFT (8*(sizeof(short int)-sizeof(char)))
 137
 138 IMPLEMENT_DYNAMIC_CLASS(wxColour,wxGDIObject)
 139
 140 wxColour::wxColour( unsigned char red, unsigned char green, unsigned char blue )
 141 {
 142     m_refData = new wxColourRefData();
 143     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 144     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 145     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 146     M_COLDATA->m_color.pixel = 0;
 147 }
 148
 149 void wxColour::InitFromName( const wxString &colourName )
 150 {
 151     wxNode *node = (wxNode *) NULL;
 152     if ( (wxTheColourDatabase) && (node = wxTheColourDatabase->Find(colourName)) )
 153     {
 154         wxColour *col = (wxColour*)node->Data();
 155         UnRef();
 156         if (col) Ref( *col );
 157     }
 158     else
 159     {
 160         m_refData = new wxColourRefData();
 161         if (!gdk_color_parse( colourName.mb_str(), &M_COLDATA->m_color ))
 162         {
 163             // VZ: asserts are good in general but this one is triggered by
 164             //     calling wxColourDatabase::FindColour() with an
 165             //     unrecognized colour name and this can't be avoided from the
 166             //     user code, so don't give it here
 167             //
 168             //     a better solution would be to changed code in FindColour()
 169
 170             //wxFAIL_MSG( wxT("wxColour: couldn't find colour") );
 171
 172             delete m_refData;
 173             m_refData = (wxObjectRefData *) NULL;
 174         }
 175     }
 176 }
 177
 178 wxColour::~wxColour()
 179 {
 180 }
 181
 182 bool wxColour::operator == ( const wxColour& col ) const
 183 {
 184     if (m_refData == col.m_refData) return TRUE;
 185
 186     if (!m_refData || !col.m_refData) return FALSE;
 187
 188     GdkColor *own = &(((wxColourRefData*)m_refData)->m_color);
 189     GdkColor *other = &(((wxColourRefData*)col.m_refData)->m_color);
 190     if (own->red != other->red) return FALSE;
 191     if (own->blue != other->blue) return FALSE;
 192     if (own->green != other->green) return FALSE;
 193
 194     return TRUE;
 195 }
 196
 197 wxObjectRefData *wxColour::CreateRefData() const
 198 {
 199     return new wxColourRefData;
 200 }
 201
 202 wxObjectRefData *wxColour::CloneRefData(const wxObjectRefData *data) const
 203 {
 204     return new wxColourRefData(*(wxColourRefData *)data);
 205 }
 206
 207 void wxColour::Set( unsigned char red, unsigned char green, unsigned char blue )
 208 {
 209     AllocExclusive();
 210
 211     m_refData = new wxColourRefData();
 212     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 213     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 214     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 215     M_COLDATA->m_color.pixel = 0;
 216 }
 217
 218 unsigned char wxColour::Red() const
 219 {
 220     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 221
 222     return (unsigned char)(M_COLDATA->m_color.red >> SHIFT);
 223 }
 224
 225 unsigned char wxColour::Green() const
 226 {
 227     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 228
 229     return (unsigned char)(M_COLDATA->m_color.green >> SHIFT);
 230 }
 231
 232 unsigned char wxColour::Blue() const
 233 {
 234     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 235
 236     return (unsigned char)(M_COLDATA->m_color.blue >> SHIFT);
 237 }
 238
 239 void wxColour::CalcPixel( GdkColormap *cmap )
 240 {
 241     if (!Ok()) return;
 242
 243     M_COLDATA->AllocColour( cmap );
 244 }
 245
 246 int wxColour::GetPixel() const
 247 {
 248     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 249
 250     return M_COLDATA->m_color.pixel;
 251 }
 252
 253 GdkColor *wxColour::GetColor() const
 254 {
 255     wxCHECK_MSG( Ok(), (GdkColor *) NULL, wxT("invalid colour") );
 256
 257     return &M_COLDATA->m_color;
 258 }
 259
 260