src/generic/paletteg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/generic/paletteg.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Created:     01/02/97
   6 // 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     ~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(const wxPalette& palette)
  70     : wxPaletteBase()
  71 {
  72     Ref(palette);
  73 }
  74
  75 wxPalette::~wxPalette()
  76 {
  77 }
  78
  79 wxPalette& wxPalette::operator = (const wxPalette& palette)
  80 {
  81     if (*this == palette) return (*this);
  82     Ref(palette);
  83     return *this;
  84 }
  85
  86 bool wxPalette::operator == (const wxPalette& palette) const
  87 {
  88     return m_refData == palette.m_refData;
  89 }
  90
  91 bool wxPalette::operator != (const wxPalette& palette) const
  92 {
  93     return m_refData != palette.m_refData;
  94 }
  95
  96 bool wxPalette::Ok(void) const
  97 {
  98     return (m_refData != NULL);
  99 }
 100
 101 bool wxPalette::Create(int n,
 102                        const unsigned char *red,
 103                        const unsigned char *green,
 104                        const unsigned char *blue)
 105 {
 106     UnRef();
 107     m_refData = new wxPaletteRefData();
 108
 109     M_PALETTEDATA->m_count = n;
 110     M_PALETTEDATA->m_entries = new wxPaletteEntry[n];
 111
 112     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 113     for (int i = 0; i < n; i++, e++)
 114     {
 115         e->red = red[i];
 116         e->green = green[i];
 117         e->blue = blue[i];
 118     }
 119
 120     return true;
 121 }
 122
 123 int wxPalette::GetPixel( const unsigned char red,
 124                          const unsigned char green,
 125                          const unsigned char blue ) const
 126 {
 127     if (!m_refData) return false;
 128
 129     int closest = 0;
 130     double d,distance = 1000.0; // max. dist is 256
 131
 132     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 133     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 134     {
 135         if ((d = 0.299 * abs(red - e->red) +
 136                  0.587 * abs(green - e->green) +
 137                  0.114 * abs(blue - e->blue)) < distance) {
 138             distance = d;
 139             closest = i;
 140         }
 141     }
 142     return closest;
 143 }
 144
 145 bool wxPalette::GetRGB(int pixel,
 146                        unsigned char *red,
 147                        unsigned char *green,
 148                        unsigned char *blue) const
 149 {
 150     if (!m_refData) return false;
 151     if (pixel >= M_PALETTEDATA->m_count) return false;
 152
 153     wxPaletteEntry& p = M_PALETTEDATA->m_entries[pixel];
 154     if (red) *red = p.red;
 155     if (green) *green = p.green;
 156     if (blue) *blue = p.blue;
 157     return true;
 158 }
 159
 160 #endif // wxUSE_PALETTE
 161
 162