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 // 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(const wxPalette& palette)
  63 {
  64     Ref(palette);
  65 }
  66
  67 wxPalette::~wxPalette()
  68 {
  69 }
  70
  71 wxPalette& wxPalette::operator = (const wxPalette& palette)
  72 {
  73     if (*this == palette) return (*this);
  74     Ref(palette);
  75     return *this;
  76 }
  77
  78 bool wxPalette::operator == (const wxPalette& palette) const
  79 {
  80     return m_refData == palette.m_refData;
  81 }
  82
  83 bool wxPalette::operator != (const wxPalette& palette) const
  84 {
  85     return m_refData != palette.m_refData;
  86 }
  87
  88 bool wxPalette::Ok(void) const
  89 {
  90     return (m_refData != NULL);
  91 }
  92
  93 bool wxPalette::Create(int n,
  94                        const unsigned char *red,
  95                        const unsigned char *green,
  96                        const unsigned char *blue)
  97 {
  98     UnRef();
  99     m_refData = new wxPaletteRefData();
 100
 101     M_PALETTEDATA->m_count = n;
 102     M_PALETTEDATA->m_entries = new palette_t[n];
 103
 104     palette_t *e = M_PALETTEDATA->m_entries;
 105     for (int i = 0; i < n; i++, e++)
 106     {
 107         e->red = red[i];
 108         e->green = green[i];
 109         e->blue = blue[i];
 110         e->alpha = 0;
 111     }
 112
 113     return TRUE;
 114 }
 115
 116 int wxPalette::GetPixel(const unsigned char red,
 117                         const unsigned char green,
 118                         const unsigned char blue) const
 119 {
 120     if (!m_refData) return FALSE;
 121
 122         int closest = 0;
 123         double d,distance = 1000.0; // max. dist is 256
 124
 125     palette_t *e = M_PALETTEDATA->m_entries;
 126     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 127     {
 128         if ((d = 0.299 * abs(red - e->red) +
 129                  0.587 * abs(green - e->green) +
 130                  0.114 * abs(blue - e->blue)) < distance) {
 131             distance = d;
 132             closest = i;
 133         }
 134     }
 135         return closest;
 136 }
 137
 138 bool wxPalette::GetRGB(int pixel,
 139                        unsigned char *red,
 140                        unsigned char *green,
 141                        unsigned char *blue) const
 142 {
 143     if (!m_refData) return FALSE;
 144     if (pixel >= M_PALETTEDATA->m_count) return FALSE;
 145
 146     palette_t& p = M_PALETTEDATA->m_entries[pixel];
 147     if (red) *red = p.red;
 148     if (green) *green = p.green;
 149     if (blue) *blue = p.blue;
 150     return TRUE;
 151 }
 152
 153 int wxPalette::GetColoursCount() const
 154 {
 155     wxCHECK_MSG( Ok(), 0, wxT("invalid palette") );
 156     return M_PALETTEDATA->m_count;
 157 }
 158
 159 palette_t *wxPalette::GetMGLpalette_t() const
 160 {
 161     wxCHECK_MSG( Ok(), NULL, wxT("invalid palette") );
 162     return M_PALETTEDATA->m_entries;
 163 }
 164