src/generic/paletteg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/generic/paletteg.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Created:     01/02/97
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 1998 Robert Roebling and Julian Smart
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // For compilers that support precompilation, includes "wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #if defined(__BORLANDC__)
  15     #pragma hdrstop
  16 #endif
  17
  18 #if wxUSE_PALETTE
  19
  20 #include "wx/palette.h"
  21
  22 //-----------------------------------------------------------------------------
  23 // wxPalette
  24 //-----------------------------------------------------------------------------
  25
  26 struct wxPaletteEntry
  27 {
  28     unsigned char red, green, blue;
  29 };
  30
  31 class wxPaletteRefData: public wxObjectRefData
  32 {
  33   public:
  34
  35     wxPaletteRefData(void);
  36     virtual ~wxPaletteRefData(void);
  37
  38     int m_count;
  39     wxPaletteEntry *m_entries;
  40 };
  41
  42 wxPaletteRefData::wxPaletteRefData()
  43 {
  44     m_count = 0;
  45     m_entries = NULL;
  46 }
  47
  48 wxPaletteRefData::~wxPaletteRefData()
  49 {
  50     delete[] m_entries;
  51 }
  52
  53 //-----------------------------------------------------------------------------
  54
  55 #define M_PALETTEDATA ((wxPaletteRefData *)m_refData)
  56
  57 IMPLEMENT_DYNAMIC_CLASS(wxPalette,wxGDIObject)
  58
  59 wxPalette::wxPalette()
  60 {
  61     m_refData = NULL;
  62 }
  63
  64 wxPalette::wxPalette(int n, const unsigned char *red, const unsigned char *green, const unsigned char *blue)
  65 {
  66     Create(n, red, green, blue);
  67 }
  68
  69 wxPalette::~wxPalette()
  70 {
  71 }
  72
  73 bool wxPalette::operator == (const wxPalette& palette) const
  74 {
  75     return m_refData == palette.m_refData;
  76 }
  77
  78 bool wxPalette::operator != (const wxPalette& palette) const
  79 {
  80     return m_refData != palette.m_refData;
  81 }
  82
  83 bool wxPalette::Ok() const
  84 {
  85     return (m_refData != NULL);
  86 }
  87
  88 int wxPalette::GetColoursCount() const
  89 {
  90     if (m_refData)
  91         return M_PALETTEDATA->m_count;
  92
  93     return 0;
  94 }
  95
  96 bool wxPalette::Create(int n,
  97                        const unsigned char *red,
  98                        const unsigned char *green,
  99                        const unsigned char *blue)
 100 {
 101     UnRef();
 102     m_refData = new wxPaletteRefData();
 103
 104     M_PALETTEDATA->m_count = n;
 105     M_PALETTEDATA->m_entries = new wxPaletteEntry[n];
 106
 107     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 108     for (int i = 0; i < n; i++, e++)
 109     {
 110         e->red = red[i];
 111         e->green = green[i];
 112         e->blue = blue[i];
 113     }
 114
 115     return true;
 116 }
 117
 118 int wxPalette::GetPixel( unsigned char red,
 119                          unsigned char green,
 120                          unsigned char blue ) const
 121 {
 122     if (!m_refData) return wxNOT_FOUND;
 123
 124     int closest = 0;
 125     double d,distance = 1000.0; // max. dist is 256
 126
 127     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 128     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 129     {
 130         if ((d = 0.299 * abs(red - e->red) +
 131                  0.587 * abs(green - e->green) +
 132                  0.114 * abs(blue - e->blue)) < distance) {
 133             distance = d;
 134             closest = i;
 135         }
 136     }
 137     return closest;
 138 }
 139
 140 bool wxPalette::GetRGB(int pixel,
 141                        unsigned char *red,
 142                        unsigned char *green,
 143                        unsigned char *blue) const
 144 {
 145     if (!m_refData) return false;
 146     if (pixel >= M_PALETTEDATA->m_count) return false;
 147
 148     wxPaletteEntry& p = M_PALETTEDATA->m_entries[pixel];
 149     if (red) *red = p.red;
 150     if (green) *green = p.green;
 151     if (blue) *blue = p.blue;
 152     return true;
 153 }
 154
 155 #endif // wxUSE_PALETTE