src/generic/paletteg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        palette.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Created:     01/02/97
   6 // Id:
   7 // Copyright:   (c) 1998 Robert Roebling, Julian Smart and Markus Holzem
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "paletteg.h"
  14 #endif
  15
  16 #include "wx/palette.h"
  17
  18
  19 //-----------------------------------------------------------------------------
  20 // wxPalette
  21 //-----------------------------------------------------------------------------
  22
  23 struct wxPaletteEntry
  24 {
  25     unsigned char red, green, blue;
  26 };
  27
  28 class wxPaletteRefData: public wxObjectRefData
  29 {
  30   public:
  31
  32     wxPaletteRefData(void);
  33     ~wxPaletteRefData(void);
  34
  35     int m_count;
  36     wxPaletteEntry *m_entries;
  37 };
  38
  39 wxPaletteRefData::wxPaletteRefData()
  40 {
  41     m_count = 0;
  42     m_entries = NULL;
  43 }
  44
  45 wxPaletteRefData::~wxPaletteRefData()
  46 {
  47     delete[] m_entries;
  48 }
  49
  50 //-----------------------------------------------------------------------------
  51
  52 #define M_PALETTEDATA ((wxPaletteRefData *)m_refData)
  53
  54 IMPLEMENT_DYNAMIC_CLASS(wxPalette,wxGDIObject)
  55
  56 wxPalette::wxPalette()
  57 {
  58     m_refData = NULL;
  59 }
  60
  61 wxPalette::wxPalette(int n, const unsigned char *red, const unsigned char *green, const unsigned char *blue)
  62 {
  63     Create(n, red, green, blue);
  64 }
  65
  66 wxPalette::wxPalette(const wxPalette& palette)
  67 {
  68     Ref(palette);
  69 }
  70
  71 wxPalette::~wxPalette()
  72 {
  73 }
  74
  75 wxPalette& wxPalette::operator = (const wxPalette& palette)
  76 {
  77     if (*this == palette) return (*this);
  78     Ref(palette);
  79     return *this;
  80 }
  81
  82 bool wxPalette::operator == (const wxPalette& palette)
  83 {
  84     return m_refData == palette.m_refData;
  85 }
  86
  87 bool wxPalette::operator != (const wxPalette& palette)
  88 {
  89     return m_refData != palette.m_refData;
  90 }
  91
  92 bool wxPalette::Ok(void) const
  93 {
  94     return (m_refData != NULL);
  95 }
  96
  97 bool wxPalette::Create(int n,
  98                        const unsigned char *red,
  99                        const unsigned char *green,
 100                        const unsigned char *blue)
 101 {
 102     UnRef();
 103     m_refData = new wxPaletteRefData();
 104
 105     M_PALETTEDATA->m_count = n;
 106     M_PALETTEDATA->m_entries = new wxPaletteEntry[n];
 107
 108     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 109     for (int i = 0; i < n; i++, e++)
 110     {
 111         e->red = red[i];
 112         e->green = green[i];
 113         e->blue = blue[i];
 114     }
 115
 116     return TRUE;
 117 }
 118
 119 int wxPalette::GetPixel( const unsigned char red,
 120                          const unsigned char green,
 121                          const unsigned char blue ) const
 122 {
 123     if (!m_refData) return FALSE;
 124
 125         int closest = 0;
 126         double d,distance = 1000.0; // max. dist is 256
 127
 128     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 129     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 130     {
 131         if ((d = 0.299 * abs(red - e->red) +
 132                  0.587 * abs(green - e->green) +
 133                  0.114 * abs(blue - e->blue)) < distance) {
 134             distance = d;
 135             closest = i;
 136         }
 137     }
 138         return closest;
 139 }
 140
 141 bool wxPalette::GetRGB(int pixel,
 142                        unsigned char *red,
 143                        unsigned char *green,
 144                        unsigned char *blue) const
 145 {
 146     if (!m_refData) return FALSE;
 147     if (pixel >= M_PALETTEDATA->m_count) return FALSE;
 148
 149     wxPaletteEntry& p = M_PALETTEDATA->m_entries[pixel];
 150     if (red) *red = p.red;
 151     if (green) *green = p.green;
 152     if (blue) *blue = p.blue;
 153     return TRUE;
 154 }
 155
 156