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     ~wxColourRefData();
  30
  31     void FreeColour();
  32     void AllocColour( GdkColormap* cmap );
  33
  34 public:
  35     GdkColor     m_color;
  36     GdkColormap *m_colormap;
  37     bool         m_hasPixel;
  38
  39     friend class wxColour;
  40
  41     // reference counter for systems with <= 8-Bit display
  42     static gushort colMapAllocCounter[ 256 ];
  43 };
  44
  45 gushort wxColourRefData::colMapAllocCounter[ 256 ] =
  46 {
  47   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  48   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  49   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  50   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  51   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  52   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  53   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  54   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  55   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  56   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  57   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  58   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  59   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  60 };
  61
  62 wxColourRefData::wxColourRefData()
  63 {
  64     m_color.red = 0;
  65     m_color.green = 0;
  66     m_color.blue = 0;
  67     m_color.pixel = 0;
  68     m_colormap = (GdkColormap *) NULL;
  69     m_hasPixel = FALSE;
  70 }
  71
  72 wxColourRefData::~wxColourRefData()
  73 {
  74     FreeColour();
  75 }
  76
  77 void wxColourRefData::FreeColour()
  78 {
  79     if (m_colormap)
  80     {
  81 #ifdef __WXGTK20__
  82         if ((m_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
  83             (m_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
  84 #else
  85         GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) m_colormap;
  86         if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
  87             (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
  88 #endif
  89         {
  90             int idx = m_color.pixel;
  91             colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] - 1;
  92
  93             if (colMapAllocCounter[ idx ] == 0)
  94             gdk_colormap_free_colors( m_colormap, &m_color, 1 );
  95         }
  96     }
  97 }
  98
  99 void wxColourRefData::AllocColour( GdkColormap *cmap )
 100 {
 101     if (m_hasPixel && (m_colormap == cmap))
 102         return;
 103
 104     FreeColour();
 105
 106 #ifdef __WXGTK20__
 107     if ((m_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 108         (m_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 109 #else
 110     GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) cmap;
 111     if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 112         (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 113 #endif
 114     {
 115         m_hasPixel = gdk_colormap_alloc_color( cmap, &m_color, FALSE, TRUE );
 116         int idx = m_color.pixel;
 117         colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] + 1;
 118     }
 119     else
 120     {
 121         m_hasPixel = gdk_color_alloc( cmap, &m_color );
 122     }
 123     m_colormap = cmap;
 124 }
 125
 126 //-----------------------------------------------------------------------------
 127
 128 #define M_COLDATA ((wxColourRefData *)m_refData)
 129
 130 #define SHIFT (8*(sizeof(short int)-sizeof(char)))
 131
 132 IMPLEMENT_DYNAMIC_CLASS(wxColour,wxGDIObject)
 133
 134 wxColour::wxColour()
 135 {
 136     m_refData = new wxColourRefData();
 137 }
 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 void wxColour::InitFromName( const wxString &colourName )
 149 {
 150     wxNode *node = (wxNode *) NULL;
 151     if ( (wxTheColourDatabase) && (node = wxTheColourDatabase->Find(colourName)) )
 152     {
 153         wxColour *col = (wxColour*)node->Data();
 154         UnRef();
 155         if (col) Ref( *col );
 156     }
 157     else
 158     {
 159         m_refData = new wxColourRefData();
 160         if (!gdk_color_parse( colourName.mb_str(), &M_COLDATA->m_color ))
 161         {
 162             // VZ: asserts are good in general but this one is triggered by
 163             //     calling wxColourDatabase::FindColour() with an
 164             //     unrecognized colour name and this can't be avoided from the
 165             //     user code, so don't give it here
 166             //
 167             //     a better solution would be to changed code in FindColour()
 168
 169             //wxFAIL_MSG( wxT("wxColour: couldn't find colour") );
 170
 171             delete m_refData;
 172             m_refData = (wxObjectRefData *) NULL;
 173         }
 174     }
 175 }
 176
 177 wxColour::wxColour( const wxColour& col )
 178 {
 179     Ref( col );
 180 }
 181
 182 wxColour::~wxColour()
 183 {
 184 }
 185
 186 wxColour& wxColour::operator = ( const wxColour& col )
 187 {
 188     if (*this == col) return (*this);
 189     Ref( col );
 190     return *this;
 191 }
 192
 193 bool wxColour::operator == ( const wxColour& col ) const
 194 {
 195     if (m_refData == col.m_refData) return TRUE;
 196
 197     if (!m_refData) return FALSE;
 198     if (!col.m_refData) return FALSE;
 199
 200     GdkColor *own = &(((wxColourRefData*)m_refData)->m_color);
 201     GdkColor *other = &(((wxColourRefData*)col.m_refData)->m_color);
 202     if (own->red != other->red) return FALSE;
 203     if (own->blue != other->blue) return FALSE;
 204     if (own->green != other->green) return FALSE;
 205
 206     return TRUE;
 207 }
 208
 209 bool wxColour::operator != ( const wxColour& col) const
 210 {
 211     return !(*this == col);
 212 }
 213
 214 void wxColour::Set( unsigned char red, unsigned char green, unsigned char blue )
 215 {
 216     UnRef();
 217     m_refData = new wxColourRefData();
 218     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 219     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 220     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 221     M_COLDATA->m_color.pixel = 0;
 222 }
 223
 224 unsigned char wxColour::Red() const
 225 {
 226     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 227
 228     return (unsigned char)(M_COLDATA->m_color.red >> SHIFT);
 229 }
 230
 231 unsigned char wxColour::Green() const
 232 {
 233     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 234
 235     return (unsigned char)(M_COLDATA->m_color.green >> SHIFT);
 236 }
 237
 238 unsigned char wxColour::Blue() const
 239 {
 240     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 241
 242     return (unsigned char)(M_COLDATA->m_color.blue >> SHIFT);
 243 }
 244
 245 bool wxColour::Ok() const
 246 {
 247     return (m_refData != NULL);
 248 }
 249
 250 void wxColour::CalcPixel( GdkColormap *cmap )
 251 {
 252     if (!Ok()) return;
 253
 254     M_COLDATA->AllocColour( cmap );
 255 }
 256
 257 int wxColour::GetPixel() const
 258 {
 259     wxCHECK_MSG( Ok(), 0, wxT("invalid colour") );
 260
 261     return M_COLDATA->m_color.pixel;
 262 }
 263
 264 GdkColor *wxColour::GetColor() const
 265 {
 266     wxCHECK_MSG( Ok(), (GdkColor *) NULL, wxT("invalid colour") );
 267
 268     return &M_COLDATA->m_color;
 269 }
 270
 271