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/colour.h"
  17 #include "wx/gtk/private.h"
  18
  19 #include <gdk/gdk.h>
  20 #include <gdk/gdkx.h>
  21 #include <gdk/gdkprivate.h>
  22
  23 //-----------------------------------------------------------------------------
  24 // wxColour
  25 //-----------------------------------------------------------------------------
  26
  27 class wxColourRefData: public wxObjectRefData
  28 {
  29 public:
  30     wxColourRefData()
  31     {
  32         m_color.red = 0;
  33         m_color.green = 0;
  34         m_color.blue = 0;
  35         m_color.pixel = 0;
  36         m_colormap = (GdkColormap *) NULL;
  37         m_hasPixel = FALSE;
  38     }
  39
  40     wxColourRefData(const wxColourRefData& data)
  41         : wxObjectRefData()
  42     {
  43         m_color = data.m_color;
  44         m_colormap = data.m_colormap;
  45         m_hasPixel = data.m_hasPixel;
  46     }
  47
  48     ~wxColourRefData()
  49     {
  50         FreeColour();
  51     }
  52
  53     bool operator == (const wxColourRefData& data) const
  54     {
  55         return (m_colormap == data.m_colormap &&
  56                 m_hasPixel == data.m_hasPixel &&
  57                 m_color.red == data.m_color.red &&
  58                 m_color.green == data.m_color.green &&
  59                 m_color.blue == data.m_color.blue &&
  60                 m_color.pixel == data.m_color.pixel);
  61     }
  62
  63     void FreeColour();
  64     void AllocColour( GdkColormap* cmap );
  65
  66     GdkColor     m_color;
  67     GdkColormap *m_colormap;
  68     bool         m_hasPixel;
  69
  70     friend class wxColour;
  71
  72     // reference counter for systems with <= 8-Bit display
  73     static gushort colMapAllocCounter[ 256 ];
  74 };
  75
  76 gushort wxColourRefData::colMapAllocCounter[ 256 ] =
  77 {
  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, 0, 0, 0, 0,
  90   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  91 };
  92
  93 void wxColourRefData::FreeColour()
  94 {
  95     if (m_colormap)
  96     {
  97 #ifdef __WXGTK20__
  98         if ((m_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
  99             (m_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 100 #else
 101         GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) m_colormap;
 102         if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 103             (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 104 #endif
 105         {
 106             int idx = m_color.pixel;
 107             colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] - 1;
 108
 109             if (colMapAllocCounter[ idx ] == 0)
 110             gdk_colormap_free_colors( m_colormap, &m_color, 1 );
 111         }
 112     }
 113 }
 114
 115 void wxColourRefData::AllocColour( GdkColormap *cmap )
 116 {
 117     if (m_hasPixel && (m_colormap == cmap))
 118         return;
 119
 120     FreeColour();
 121
 122 #ifdef __WXGTK20__
 123     if ( (cmap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 124              (cmap->visual->type == GDK_VISUAL_PSEUDO_COLOR) )
 125 #else
 126     GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) cmap;
 127     if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 128         (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 129 #endif
 130     {
 131         m_hasPixel = gdk_colormap_alloc_color( cmap, &m_color, FALSE, TRUE );
 132         int idx = m_color.pixel;
 133         colMapAllocCounter[ idx ] = colMapAllocCounter[ idx ] + 1;
 134     }
 135     else
 136     {
 137         m_hasPixel = gdk_color_alloc( cmap, &m_color );
 138     }
 139     m_colormap = cmap;
 140 }
 141
 142 //-----------------------------------------------------------------------------
 143
 144 #define M_COLDATA ((wxColourRefData *)m_refData)
 145
 146 #define SHIFT (8*(sizeof(short int)-sizeof(char)))
 147
 148 IMPLEMENT_DYNAMIC_CLASS(wxColour,wxGDIObject)
 149
 150 wxColour::wxColour( unsigned char red, unsigned char green, unsigned char blue )
 151 {
 152     m_refData = new wxColourRefData();
 153     M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 154     M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 155     M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 156     M_COLDATA->m_color.pixel = 0;
 157 }
 158
 159 void wxColour::InitFromName( const wxString &colourName )
 160 {
 161     wxNode *node = (wxNode *) NULL;
 162     if ( (wxTheColourDatabase) && (node = wxTheColourDatabase->Find(colourName)) )
 163     {
 164         wxColour *col = (wxColour*)node->GetData();
 165         UnRef();
 166         if (col) Ref( *col );
 167     }
 168     else
 169     {
 170         m_refData = new wxColourRefData();
 171
 172         if (!gdk_color_parse( wxGTK_CONV( colourName ), &M_COLDATA->m_color ))
 173         {
 174             // VZ: asserts are good in general but this one is triggered by
 175             //     calling wxColourDatabase::FindColour() with an
 176             //     unrecognized colour name and this can't be avoided from the
 177             //     user code, so don't give it here
 178             //
 179             //     a better solution would be to changed code in FindColour()
 180
 181             //wxFAIL_MSG( wxT("wxColour: couldn't find colour") );
 182
 183             delete m_refData;
 184             m_refData = (wxObjectRefData *) NULL;
 185         }
 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) return TRUE;
 196
 197     if (!m_refData || !col.m_refData) return FALSE;
 198
 199     GdkColor *own = &(((wxColourRefData*)m_refData)->m_color);
 200     GdkColor *other = &(((wxColourRefData*)col.m_refData)->m_color);
 201     if (own->red != other->red) return FALSE;
 202     if (own->blue != other->blue) return FALSE;
 203     if (own->green != other->green) return FALSE;
 204
 205     return TRUE;
 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 }
 272
 273