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, Julian Smart and Markus Holzem
   8 // Licence:       wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "paletteg.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #if defined(__BORLANDC__)
  20     #pragma hdrstop
  21 #endif
  22
  23 #if wxUSE_PALETTE
  24
  25 #include "wx/palette.h"
  26
  27 //-----------------------------------------------------------------------------
  28 // wxPalette
  29 //-----------------------------------------------------------------------------
  30
  31 struct wxPaletteEntry
  32 {
  33     unsigned char red, green, blue;
  34 };
  35
  36 class wxPaletteRefData: public wxObjectRefData
  37 {
  38   public:
  39
  40     wxPaletteRefData(void);
  41     ~wxPaletteRefData(void);
  42
  43     int m_count;
  44     wxPaletteEntry *m_entries;
  45 };
  46
  47 wxPaletteRefData::wxPaletteRefData()
  48 {
  49     m_count = 0;
  50     m_entries = NULL;
  51 }
  52
  53 wxPaletteRefData::~wxPaletteRefData()
  54 {
  55     delete[] m_entries;
  56 }
  57
  58 //-----------------------------------------------------------------------------
  59
  60 #define M_PALETTEDATA ((wxPaletteRefData *)m_refData)
  61
  62 IMPLEMENT_DYNAMIC_CLASS(wxPalette,wxGDIObject)
  63
  64 wxPalette::wxPalette()
  65 {
  66     m_refData = NULL;
  67 }
  68
  69 wxPalette::wxPalette(int n, const unsigned char *red, const unsigned char *green, const unsigned char *blue)
  70 {
  71     Create(n, red, green, blue);
  72 }
  73
  74 wxPalette::wxPalette(const wxPalette& palette)
  75 {
  76     Ref(palette);
  77 }
  78
  79 wxPalette::~wxPalette()
  80 {
  81 }
  82
  83 wxPalette& wxPalette::operator = (const wxPalette& palette)
  84 {
  85     if (*this == palette) return (*this);
  86     Ref(palette);
  87     return *this;
  88 }
  89
  90 bool wxPalette::operator == (const wxPalette& palette)
  91 {
  92     return m_refData == palette.m_refData;
  93 }
  94
  95 bool wxPalette::operator != (const wxPalette& palette)
  96 {
  97     return m_refData != palette.m_refData;
  98 }
  99
 100 bool wxPalette::Ok(void) const
 101 {
 102     return (m_refData != NULL);
 103 }
 104
 105 bool wxPalette::Create(int n,
 106                        const unsigned char *red,
 107                        const unsigned char *green,
 108                        const unsigned char *blue)
 109 {
 110     UnRef();
 111     m_refData = new wxPaletteRefData();
 112
 113     M_PALETTEDATA->m_count = n;
 114     M_PALETTEDATA->m_entries = new wxPaletteEntry[n];
 115
 116     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 117     for (int i = 0; i < n; i++, e++)
 118     {
 119         e->red = red[i];
 120         e->green = green[i];
 121         e->blue = blue[i];
 122     }
 123
 124     return TRUE;
 125 }
 126
 127 int wxPalette::GetPixel( const unsigned char red,
 128                          const unsigned char green,
 129                          const unsigned char blue ) const
 130 {
 131     if (!m_refData) return FALSE;
 132
 133     int closest = 0;
 134     double d,distance = 1000.0; // max. dist is 256
 135
 136     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 137     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 138     {
 139         if ((d = 0.299 * abs(red - e->red) +
 140                  0.587 * abs(green - e->green) +
 141                  0.114 * abs(blue - e->blue)) < distance) {
 142             distance = d;
 143             closest = i;
 144         }
 145     }
 146     return closest;
 147 }
 148
 149 bool wxPalette::GetRGB(int pixel,
 150                        unsigned char *red,
 151                        unsigned char *green,
 152                        unsigned char *blue) const
 153 {
 154     if (!m_refData) return FALSE;
 155     if (pixel >= M_PALETTEDATA->m_count) return FALSE;
 156
 157     wxPaletteEntry& p = M_PALETTEDATA->m_entries[pixel];
 158     if (red) *red = p.red;
 159     if (green) *green = p.green;
 160     if (blue) *blue = p.blue;
 161     return TRUE;
 162 }
 163
 164 #endif // wxUSE_PALETTE
 165
 166