src/gtk/palette.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        palette.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Created:     01/02/97
   6 // Id:
   7 // Copyright:   (c) 1998 Robert Roebling, Julian Smart and Markus Holzem
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "palette.h"
  14 #endif
  15
  16 #include "wx/palette.h"
  17
  18 #include <gdk/gdk.h>
  19
  20 //-----------------------------------------------------------------------------
  21 // wxPalette
  22 //-----------------------------------------------------------------------------
  23
  24 struct wxPaletteEntry
  25 {
  26     unsigned char red, green, blue;
  27 };
  28
  29 class wxPaletteRefData: public wxObjectRefData
  30 {
  31   public:
  32
  33     wxPaletteRefData(void);
  34     ~wxPaletteRefData(void);
  35
  36     int m_count;
  37     wxPaletteEntry *m_entries;
  38 #if 0
  39     GdkColormap  *m_colormap;
  40 #endif
  41 };
  42
  43 wxPaletteRefData::wxPaletteRefData()
  44 {
  45     m_count = 0;
  46     m_entries = NULL;
  47 #if 0
  48     m_colormap = (GdkColormap *) NULL;
  49 #endif
  50 }
  51
  52 wxPaletteRefData::~wxPaletteRefData()
  53 {
  54     delete[] m_entries;
  55 #if 0
  56     if (m_colormap) gdk_colormap_unref( m_colormap );
  57 #endif
  58 }
  59
  60 //-----------------------------------------------------------------------------
  61
  62 #define M_PALETTEDATA ((wxPaletteRefData *)m_refData)
  63
  64 IMPLEMENT_DYNAMIC_CLASS(wxPalette,wxGDIObject)
  65
  66 wxPalette::wxPalette()
  67 {
  68     m_refData = NULL;
  69 }
  70
  71 wxPalette::wxPalette(int n, const unsigned char *red, const unsigned char *green, const unsigned char *blue)
  72 {
  73     Create(n, red, green, blue);
  74 }
  75
  76 wxPalette::wxPalette(const wxPalette& palette)
  77 {
  78     Ref(palette);
  79 }
  80
  81 wxPalette::~wxPalette()
  82 {
  83 }
  84
  85 wxPalette& wxPalette::operator = (const wxPalette& palette)
  86 {
  87     if (*this == palette) return (*this);
  88     Ref(palette);
  89     return *this;
  90 }
  91
  92 bool wxPalette::operator == (const wxPalette& palette)
  93 {
  94     return m_refData == palette.m_refData;
  95 }
  96
  97 bool wxPalette::operator != (const wxPalette& palette)
  98 {
  99     return m_refData != palette.m_refData;
 100 }
 101
 102 bool wxPalette::Ok(void) const
 103 {
 104     return (m_refData != NULL);
 105 }
 106
 107 bool wxPalette::Create(int n,
 108                        const unsigned char *red,
 109                        const unsigned char *green,
 110                        const unsigned char *blue)
 111 {
 112     UnRef();
 113     m_refData = new wxPaletteRefData();
 114
 115     M_PALETTEDATA->m_count = n;
 116     M_PALETTEDATA->m_entries = new wxPaletteEntry[n];
 117
 118     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 119     for (int i = 0; i < n; i++, e++)
 120     {
 121         e->red = red[i];
 122         e->green = green[i];
 123         e->blue = blue[i];
 124     }
 125
 126     return TRUE;
 127 }
 128
 129 int wxPalette::GetPixel( const unsigned char red,
 130                          const unsigned char green,
 131                          const unsigned char blue ) const
 132 {
 133     if (!m_refData) return FALSE;
 134
 135         int closest = 0;
 136         double d,distance = 1000.0; // max. dist is 256
 137
 138     wxPaletteEntry *e = M_PALETTEDATA->m_entries;
 139     for (int i = 0; i < M_PALETTEDATA->m_count; i++, e++)
 140     {
 141         if ((d = 0.299 * abs(red - e->red) +
 142                  0.587 * abs(green - e->green) +
 143                  0.114 * abs(blue - e->blue)) < distance) {
 144             distance = d;
 145             closest = i;
 146         }
 147     }
 148         return closest;
 149 }
 150
 151 bool wxPalette::GetRGB(int pixel,
 152                        unsigned char *red,
 153                        unsigned char *green,
 154                        unsigned char *blue) const
 155 {
 156     if (!m_refData) return FALSE;
 157     if (pixel >= M_PALETTEDATA->m_count) return FALSE;
 158
 159     wxPaletteEntry& p = M_PALETTEDATA->m_entries[pixel];
 160     if (red) *red = p.red;
 161     if (green) *green = p.green;
 162     if (blue) *blue = p.blue;
 163     return TRUE;
 164 }
 165
 166