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         ~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::operator == (const wxPalette& palette) const
  67 {
  68     return m_refData == palette.m_refData;
  69 }
  70
  71 bool wxPalette::operator != (const wxPalette& palette) const
  72 {
  73     return m_refData != palette.m_refData;
  74 }
  75
  76 bool wxPalette::Ok(void) const
  77 {
  78     return (m_refData != NULL);
  79 }
  80
  81 bool wxPalette::Create(int n,
  82                        const unsigned char *red,
  83                        const unsigned char *green,
  84                        const unsigned char *blue)
  85 {
  86     UnRef();
  87     m_refData = new wxPaletteRefData();
  88
  89     M_PALETTEDATA->m_count = n;
  90     M_PALETTEDATA->m_entries = new palette_t[n];
  91
  92     palette_t *e = M_PALETTEDATA->m_entries;
  93     for (int i = 0; i < n; i++, e++)
  94     {
  95         e->red = red[i];
  96         e->green = green[i];
  97         e->blue = blue[i];
  98         e->alpha = 0;
  99     }
 100
 101     return true;
 102 }
 103
 104 int wxPalette::GetPixel(unsigned char red,
 105                         unsigned char green,
 106                         unsigned char blue) const
 107 {
 108     if (!m_refData) return wxNOT_FOUND;
 109
 110     int closest = 0;
 111     double d, distance = 1000.0; // max. dist is 256
 112
 113     palette_t *e = M_PALETTEDATA->m_entries;
 114     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 115     {
 116         if ((d = 0.299 * abs(red - e->red) +
 117                  0.587 * abs(green - e->green) +
 118                  0.114 * abs(blue - e->blue)) < distance) {
 119             distance = d;
 120             closest = i;
 121         }
 122     }
 123
 124     return closest;
 125 }
 126
 127 bool wxPalette::GetRGB(int pixel,
 128                        unsigned char *red,
 129                        unsigned char *green,
 130                        unsigned char *blue) const
 131 {
 132     if (!m_refData) return false;
 133     if (pixel >= M_PALETTEDATA->m_count) return false;
 134
 135     palette_t& p = M_PALETTEDATA->m_entries[pixel];
 136     if (red) *red = p.red;
 137     if (green) *green = p.green;
 138     if (blue) *blue = p.blue;
 139     return true;
 140 }
 141
 142 int wxPalette::GetColoursCount() const
 143 {
 144     wxCHECK_MSG( Ok(), 0, wxT("invalid palette") );
 145     return M_PALETTEDATA->m_count;
 146 }
 147
 148 palette_t *wxPalette::GetMGLpalette_t() const
 149 {
 150     wxCHECK_MSG( Ok(), NULL, wxT("invalid palette") );
 151     return M_PALETTEDATA->m_entries;
 152 }