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     ~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(void) const
  84 {
  85     return (m_refData != NULL);
  86 }
  87
  88 bool wxPalette::Create(int n,
  89                        const unsigned char *red,
  90                        const unsigned char *green,
  91                        const unsigned char *blue)
  92 {
  93     UnRef();
  94     m_refData = new wxPaletteRefData();
  95
  96     M_PALETTEDATA->m_count = n;
  97     M_PALETTEDATA->m_entries = new wxPaletteEntry[n];
  98
  99     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 100     for (int i = 0; i < n; i++, e++)
 101     {
 102         e->red = red[i];
 103         e->green = green[i];
 104         e->blue = blue[i];
 105     }
 106
 107     return true;
 108 }
 109
 110 int wxPalette::GetPixel( unsigned char red,
 111                          unsigned char green,
 112                          unsigned char blue ) const
 113 {
 114     if (!m_refData) return wxNOT_FOUND;
 115
 116     int closest = 0;
 117     double d,distance = 1000.0; // max. dist is 256
 118
 119     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 120     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 121     {
 122         if ((d = 0.299 * abs(red - e->red) +
 123                  0.587 * abs(green - e->green) +
 124                  0.114 * abs(blue - e->blue)) < distance) {
 125             distance = d;
 126             closest = i;
 127         }
 128     }
 129     return closest;
 130 }
 131
 132 bool wxPalette::GetRGB(int pixel,
 133                        unsigned char *red,
 134                        unsigned char *green,
 135                        unsigned char *blue) const
 136 {
 137     if (!m_refData) return false;
 138     if (pixel >= M_PALETTEDATA->m_count) return false;
 139
 140     wxPaletteEntry& p = M_PALETTEDATA->m_entries[pixel];
 141     if (red) *red = p.red;
 142     if (green) *green = p.green;
 143     if (blue) *blue = p.blue;
 144     return true;
 145 }
 146
 147 #endif // wxUSE_PALETTE