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