src/mgl/palette.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/mgl/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 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14     #pragma hdrstop
  15 #endif
  16
  17 #include "wx/palette.h"
  18 #include <mgraph.h>
  19
  20
  21 //-----------------------------------------------------------------------------
  22 // wxPalette
  23 //-----------------------------------------------------------------------------
  24
  25 class wxPaletteRefData: public wxObjectRefData
  26 {
  27     public:
  28         wxPaletteRefData(void);
  29         virtual ~wxPaletteRefData(void);
  30
  31         int m_count;
  32         palette_t *m_entries;
  33 };
  34
  35 wxPaletteRefData::wxPaletteRefData()
  36 {
  37     m_count = 0;
  38     m_entries = NULL;
  39 }
  40
  41 wxPaletteRefData::~wxPaletteRefData()
  42 {
  43     delete[] m_entries;
  44 }
  45
  46 //-----------------------------------------------------------------------------
  47
  48 #define M_PALETTEDATA ((wxPaletteRefData *)m_refData)
  49
  50 IMPLEMENT_DYNAMIC_CLASS(wxPalette,wxGDIObject)
  51
  52 wxPalette::wxPalette()
  53 {
  54     m_refData = NULL;
  55 }
  56
  57 wxPalette::wxPalette(int n, const unsigned char *red, const unsigned char *green, const unsigned char *blue)
  58 {
  59     Create(n, red, green, blue);
  60 }
  61
  62 wxPalette::~wxPalette()
  63 {
  64 }
  65
  66 bool wxPalette::IsOk(void) const
  67 {
  68     return (m_refData != NULL);
  69 }
  70
  71 bool wxPalette::Create(int n,
  72                        const unsigned char *red,
  73                        const unsigned char *green,
  74                        const unsigned char *blue)
  75 {
  76     UnRef();
  77     m_refData = new wxPaletteRefData();
  78
  79     M_PALETTEDATA->m_count = n;
  80     M_PALETTEDATA->m_entries = new palette_t[n];
  81
  82     palette_t *e = M_PALETTEDATA->m_entries;
  83     for (int i = 0; i < n; i++, e++)
  84     {
  85         e->red = red[i];
  86         e->green = green[i];
  87         e->blue = blue[i];
  88         e->alpha = 0;
  89     }
  90
  91     return true;
  92 }
  93
  94 int wxPalette::GetPixel(unsigned char red,
  95                         unsigned char green,
  96                         unsigned char blue) const
  97 {
  98     if (!m_refData) return wxNOT_FOUND;
  99
 100     int closest = 0;
 101     double d, distance = 1000.0; // max. dist is 256
 102
 103     palette_t *e = M_PALETTEDATA->m_entries;
 104     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 105     {
 106         if ((d = 0.299 * abs(red - e->red) +
 107                  0.587 * abs(green - e->green) +
 108                  0.114 * abs(blue - e->blue)) < distance) {
 109             distance = d;
 110             closest = i;
 111         }
 112     }
 113
 114     return closest;
 115 }
 116
 117 bool wxPalette::GetRGB(int pixel,
 118                        unsigned char *red,
 119                        unsigned char *green,
 120                        unsigned char *blue) const
 121 {
 122     if (!m_refData) return false;
 123     if (pixel >= M_PALETTEDATA->m_count) return false;
 124
 125     palette_t& p = M_PALETTEDATA->m_entries[pixel];
 126     if (red) *red = p.red;
 127     if (green) *green = p.green;
 128     if (blue) *blue = p.blue;
 129     return true;
 130 }
 131
 132 int wxPalette::GetColoursCount() const
 133 {
 134     wxCHECK_MSG( Ok(), 0, wxT("invalid palette") );
 135     return M_PALETTEDATA->m_count;
 136 }
 137
 138 palette_t *wxPalette::GetMGLpalette_t() const
 139 {
 140     wxCHECK_MSG( Ok(), NULL, wxT("invalid palette") );
 141     return M_PALETTEDATA->m_entries;
 142 }