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
  12 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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     : wxGDIObject()
  76 {
  77     Ref(palette);
  78 }
  79
  80 wxPalette::~wxPalette()
  81 {
  82 }
  83
  84 wxPalette& wxPalette::operator = (const wxPalette& palette)
  85 {
  86     if (*this == palette) return (*this);
  87     Ref(palette);
  88     return *this;
  89 }
  90
  91 bool wxPalette::operator == (const wxPalette& palette)
  92 {
  93     return m_refData == palette.m_refData;
  94 }
  95
  96 bool wxPalette::operator != (const wxPalette& palette)
  97 {
  98     return m_refData != palette.m_refData;
  99 }
 100
 101 bool wxPalette::Ok(void) const
 102 {
 103     return (m_refData != NULL);
 104 }
 105
 106 bool wxPalette::Create(int n,
 107                        const unsigned char *red,
 108                        const unsigned char *green,
 109                        const unsigned char *blue)
 110 {
 111     UnRef();
 112     m_refData = new wxPaletteRefData();
 113
 114     M_PALETTEDATA->m_count = n;
 115     M_PALETTEDATA->m_entries = new wxPaletteEntry[n];
 116
 117     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 118     for (int i = 0; i < n; i++, e++)
 119     {
 120         e->red = red[i];
 121         e->green = green[i];
 122         e->blue = blue[i];
 123     }
 124
 125     return TRUE;
 126 }
 127
 128 int wxPalette::GetPixel( const unsigned char red,
 129                          const unsigned char green,
 130                          const unsigned char blue ) const
 131 {
 132     if (!m_refData) return FALSE;
 133
 134     int closest = 0;
 135     double d,distance = 1000.0; // max. dist is 256
 136
 137     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 138     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 139     {
 140         if ((d = 0.299 * abs(red - e->red) +
 141                  0.587 * abs(green - e->green) +
 142                  0.114 * abs(blue - e->blue)) < distance) {
 143             distance = d;
 144             closest = i;
 145         }
 146     }
 147     return closest;
 148 }
 149
 150 bool wxPalette::GetRGB(int pixel,
 151                        unsigned char *red,
 152                        unsigned char *green,
 153                        unsigned char *blue) const
 154 {
 155     if (!m_refData) return FALSE;
 156     if (pixel >= M_PALETTEDATA->m_count) return FALSE;
 157
 158     wxPaletteEntry& p = M_PALETTEDATA->m_entries[pixel];
 159     if (red) *red = p.red;
 160     if (green) *green = p.green;
 161     if (blue) *blue = p.blue;
 162     return TRUE;
 163 }
 164
 165 #endif // wxUSE_PALETTE
 166
 167