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::IsOk() const
  74 {
  75     return (m_refData != NULL);
  76 }
  77
  78 int wxPalette::GetColoursCount() const
  79 {
  80     if (m_refData)
  81         return M_PALETTEDATA->m_count;
  82
  83     return 0;
  84 }
  85
  86 bool wxPalette::Create(int n,
  87                        const unsigned char *red,
  88                        const unsigned char *green,
  89                        const unsigned char *blue)
  90 {
  91     UnRef();
  92     m_refData = new wxPaletteRefData();
  93
  94     M_PALETTEDATA->m_count = n;
  95     M_PALETTEDATA->m_entries = new wxPaletteEntry[n];
  96
  97     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
  98     for (int i = 0; i < n; i++, e++)
  99     {
 100         e->red = red[i];
 101         e->green = green[i];
 102         e->blue = blue[i];
 103     }
 104
 105     return true;
 106 }
 107
 108 int wxPalette::GetPixel( unsigned char red,
 109                          unsigned char green,
 110                          unsigned char blue ) const
 111 {
 112     if (!m_refData) return wxNOT_FOUND;
 113
 114     int closest = 0;
 115     double d,distance = 1000.0; // max. dist is 256
 116
 117     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 118     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 119     {
 120         if ((d = 0.299 * abs(red - e->red) +
 121                  0.587 * abs(green - e->green) +
 122                  0.114 * abs(blue - e->blue)) < distance) {
 123             distance = d;
 124             closest = i;
 125         }
 126     }
 127     return closest;
 128 }
 129
 130 bool wxPalette::GetRGB(int pixel,
 131                        unsigned char *red,
 132                        unsigned char *green,
 133                        unsigned char *blue) const
 134 {
 135     if (!m_refData) return false;
 136     if (pixel >= M_PALETTEDATA->m_count) return false;
 137
 138     wxPaletteEntry& p = M_PALETTEDATA->m_entries[pixel];
 139     if (red) *red = p.red;
 140     if (green) *green = p.green;
 141     if (blue) *blue = p.blue;
 142     return true;
 143 }
 144
 145 #endif // wxUSE_PALETTE