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