src/mgl/palette.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        palette.cpp
   3 // Author:      Vaclav Slavik
   4 // Created:     2001/03/11
   5 // Id:          $Id$
   6 // Copyright:   (c) 2001-2002 SciTech Software, Inc. (www.scitechsoft.com)
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  12 #pragma implementation "palette.h"
  13 #endif
  14
  15 // For compilers that support precompilation, includes "wx.h".
  16 #include "wx/wxprec.h"
  17
  18 #ifdef __BORLANDC__
  19     #pragma hdrstop
  20 #endif
  21
  22 #include "wx/palette.h"
  23 #include <mgraph.h>
  24
  25
  26 //-----------------------------------------------------------------------------
  27 // wxPalette
  28 //-----------------------------------------------------------------------------
  29
  30 class wxPaletteRefData: public wxObjectRefData
  31 {
  32     public:
  33         wxPaletteRefData(void);
  34         ~wxPaletteRefData(void);
  35
  36         int m_count;
  37         palette_t *m_entries;
  38 };
  39
  40 wxPaletteRefData::wxPaletteRefData()
  41 {
  42     m_count = 0;
  43     m_entries = NULL;
  44 }
  45
  46 wxPaletteRefData::~wxPaletteRefData()
  47 {
  48     delete[] m_entries;
  49 }
  50
  51 //-----------------------------------------------------------------------------
  52
  53 #define M_PALETTEDATA ((wxPaletteRefData *)m_refData)
  54
  55 IMPLEMENT_DYNAMIC_CLASS(wxPalette,wxGDIObject)
  56
  57 wxPalette::wxPalette()
  58 {
  59     m_refData = NULL;
  60 }
  61
  62 wxPalette::wxPalette(int n, const unsigned char *red, const unsigned char *green, const unsigned char *blue)
  63 {
  64     Create(n, red, green, blue);
  65 }
  66
  67 wxPalette::wxPalette(const wxPalette& palette)
  68 {
  69     Ref(palette);
  70 }
  71
  72 wxPalette::~wxPalette()
  73 {
  74 }
  75
  76 wxPalette& wxPalette::operator = (const wxPalette& palette)
  77 {
  78     if (*this == palette) return (*this);
  79     Ref(palette);
  80     return *this;
  81 }
  82
  83 bool wxPalette::operator == (const wxPalette& palette) const
  84 {
  85     return m_refData == palette.m_refData;
  86 }
  87
  88 bool wxPalette::operator != (const wxPalette& palette) const
  89 {
  90     return m_refData != palette.m_refData;
  91 }
  92
  93 bool wxPalette::Ok(void) const
  94 {
  95     return (m_refData != NULL);
  96 }
  97
  98 bool wxPalette::Create(int n,
  99                        const unsigned char *red,
 100                        const unsigned char *green,
 101                        const unsigned char *blue)
 102 {
 103     UnRef();
 104     m_refData = new wxPaletteRefData();
 105
 106     M_PALETTEDATA->m_count = n;
 107     M_PALETTEDATA->m_entries = new palette_t[n];
 108
 109     palette_t *e = M_PALETTEDATA->m_entries;
 110     for (int i = 0; i < n; i++, e++)
 111     {
 112         e->red = red[i];
 113         e->green = green[i];
 114         e->blue = blue[i];
 115         e->alpha = 0;
 116     }
 117
 118     return TRUE;
 119 }
 120
 121 int wxPalette::GetPixel(const unsigned char red,
 122                         const unsigned char green,
 123                         const unsigned char blue) const
 124 {
 125     if (!m_refData) return FALSE;
 126
 127         int closest = 0;
 128         double d,distance = 1000.0; // max. dist is 256
 129
 130     palette_t *e = M_PALETTEDATA->m_entries;
 131     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 132     {
 133         if ((d = 0.299 * abs(red - e->red) +
 134                  0.587 * abs(green - e->green) +
 135                  0.114 * abs(blue - e->blue)) < distance) {
 136             distance = d;
 137             closest = i;
 138         }
 139     }
 140         return closest;
 141 }
 142
 143 bool wxPalette::GetRGB(int pixel,
 144                        unsigned char *red,
 145                        unsigned char *green,
 146                        unsigned char *blue) const
 147 {
 148     if (!m_refData) return FALSE;
 149     if (pixel >= M_PALETTEDATA->m_count) return FALSE;
 150
 151     palette_t& p = M_PALETTEDATA->m_entries[pixel];
 152     if (red) *red = p.red;
 153     if (green) *green = p.green;
 154     if (blue) *blue = p.blue;
 155     return TRUE;
 156 }
 157
 158 int wxPalette::GetColoursCount() const
 159 {
 160     wxCHECK_MSG( Ok(), 0, wxT("invalid palette") );
 161     return M_PALETTEDATA->m_count;
 162 }
 163
 164 palette_t *wxPalette::GetMGLpalette_t() const
 165 {
 166     wxCHECK_MSG( Ok(), NULL, wxT("invalid palette") );
 167     return M_PALETTEDATA->m_entries;
 168 }
 169