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/gdkprivate.h"
  18
  19 //-----------------------------------------------------------------------------
  20 // wxColour
  21 //-----------------------------------------------------------------------------
  22
  23 class wxColourRefData: public wxObjectRefData
  24 {
  25   public:
  26
  27     wxColourRefData();
  28     ~wxColourRefData();
  29     void FreeColour();
  30
  31     GdkColor     m_color;
  32     GdkColormap *m_colormap;
  33     bool         m_hasPixel;
  34
  35     friend wxColour;
  36 };
  37
  38 wxColourRefData::wxColourRefData()
  39 {
  40   m_color.red = 0;
  41   m_color.green = 0;
  42   m_color.blue = 0;
  43   m_color.pixel = 0;
  44   m_colormap = (GdkColormap *) NULL;
  45   m_hasPixel = FALSE;
  46 }
  47
  48 wxColourRefData::~wxColourRefData()
  49 {
  50   FreeColour();
  51 }
  52
  53 void wxColourRefData::FreeColour()
  54 {
  55 //  if (m_hasPixel) gdk_colors_free( m_colormap, &m_color, 1, 0 );
  56 }
  57
  58 //-----------------------------------------------------------------------------
  59
  60 #define M_COLDATA ((wxColourRefData *)m_refData)
  61
  62 #define SHIFT (8*(sizeof(short int)-sizeof(char)))
  63
  64 IMPLEMENT_DYNAMIC_CLASS(wxColour,wxGDIObject)
  65
  66 wxColour::wxColour()
  67 {
  68 }
  69
  70 wxColour::wxColour( unsigned char red, unsigned char green, unsigned char blue )
  71 {
  72   m_refData = new wxColourRefData();
  73   M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
  74   M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
  75   M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
  76   M_COLDATA->m_color.pixel = 0;
  77 }
  78
  79 void wxColour::InitFromName( const wxString &colourName )
  80 {
  81   wxNode *node = (wxNode *) NULL;
  82   if ( (wxTheColourDatabase) && (node = wxTheColourDatabase->Find(colourName)) )
  83   {
  84     wxColour *col = (wxColour*)node->Data();
  85     UnRef();
  86     if (col) Ref( *col );
  87   }
  88   else
  89   {
  90     m_refData = new wxColourRefData();
  91     if (!gdk_color_parse( colourName, &M_COLDATA->m_color ))
  92     {
  93       wxFAIL_MSG( "wxColour: couldn't find colour" );
  94       delete m_refData;
  95       m_refData = (wxObjectRefData *) NULL;
  96     }
  97   }
  98 }
  99
 100 wxColour::wxColour( const wxColour& col )
 101 {
 102   Ref( col );
 103 }
 104
 105 wxColour::~wxColour()
 106 {
 107 }
 108
 109 wxColour& wxColour::operator = ( const wxColour& col )
 110 {
 111   if (*this == col) return (*this);
 112   Ref( col );
 113   return *this;
 114 }
 115
 116 bool wxColour::operator == ( const wxColour& col )
 117 {
 118   return m_refData == col.m_refData;
 119 }
 120
 121 bool wxColour::operator != ( const wxColour& col)
 122 {
 123   return m_refData != col.m_refData;
 124 }
 125
 126 void wxColour::Set( unsigned char red, unsigned char green, unsigned char blue )
 127 {
 128   UnRef();
 129   m_refData = new wxColourRefData();
 130   M_COLDATA->m_color.red = ((unsigned short)red) << SHIFT;
 131   M_COLDATA->m_color.green = ((unsigned short)green) << SHIFT;
 132   M_COLDATA->m_color.blue = ((unsigned short)blue) << SHIFT;
 133   M_COLDATA->m_color.pixel = 0;
 134 }
 135
 136 unsigned char wxColour::Red() const
 137 {
 138   if (!Ok())
 139   {
 140      wxFAIL_MSG( "invalid colour" );
 141      return 0;
 142   }
 143
 144   return (unsigned char)(M_COLDATA->m_color.red >> SHIFT);
 145 }
 146
 147 unsigned char wxColour::Green() const
 148 {
 149   if (!Ok())
 150   {
 151      wxFAIL_MSG( "invalid colour" );
 152      return 0;
 153   }
 154
 155   return (unsigned char)(M_COLDATA->m_color.green >> SHIFT);
 156 }
 157
 158 unsigned char wxColour::Blue() const
 159 {
 160   if (!Ok())
 161   {
 162      wxFAIL_MSG( "invalid colour" );
 163      return 0;
 164   }
 165
 166   return (unsigned char)(M_COLDATA->m_color.blue >> SHIFT);
 167 }
 168
 169 bool wxColour::Ok() const
 170 {
 171   return (m_refData != NULL);
 172 }
 173
 174 void wxColour::CalcPixel( GdkColormap *cmap )
 175 {
 176   if (!Ok()) return;
 177
 178   if ((M_COLDATA->m_hasPixel) && (M_COLDATA->m_colormap == cmap)) return;
 179   M_COLDATA->FreeColour();
 180
 181   GdkColormapPrivate *private_colormap = (GdkColormapPrivate*) cmap;
 182   if ((private_colormap->visual->type == GDK_VISUAL_GRAYSCALE) ||
 183       (private_colormap->visual->type == GDK_VISUAL_PSEUDO_COLOR))
 184   {
 185     GdkColor *colors = cmap->colors;
 186     int max = 3 * (65536);
 187     int index = -1;
 188
 189     for (int i = 0; i < cmap->size; i++)
 190     {
 191       int rdiff = (M_COLDATA->m_color.red - colors[i].red);
 192       int gdiff = (M_COLDATA->m_color.green - colors[i].green);
 193       int bdiff = (M_COLDATA->m_color.blue - colors[i].blue);
 194       int sum = ABS (rdiff) + ABS (gdiff) + ABS (bdiff);
 195       if (sum < max) { index = i; max = sum; }
 196     }
 197
 198     M_COLDATA->m_hasPixel = TRUE;
 199     M_COLDATA->m_color.pixel = index;
 200   }
 201   else
 202   {
 203     M_COLDATA->m_hasPixel = gdk_color_alloc( cmap, &M_COLDATA->m_color );
 204   }
 205
 206   M_COLDATA->m_colormap = cmap;
 207 }
 208
 209 int wxColour::GetPixel() const
 210 {
 211   if (!Ok()) return 0;
 212
 213   return M_COLDATA->m_color.pixel;
 214 }
 215
 216 GdkColor *wxColour::GetColor() const
 217 {
 218   if (!Ok()) return (GdkColor *) NULL;
 219
 220   return &M_COLDATA->m_color;
 221 }
 222
 223