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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: rgncmn.cpp
3 // Purpose: Methods of wxRegion that have a generic implementation
4 // Author: Robin Dunn
5 // Modified by:
6 // Created: 27-Mar-2003
7 // RCS-ID: $Id$
8 // Copyright: (c) Robin Dunn
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 // For compilers that support precompilation, includes "wx.h".
13 #include "wx/wxprec.h"
14
15 #ifdef __BORLANDC__
16 #pragma hdrstop
17 #endif
18
19 #include "wx/region.h"
20 #include "wx/bitmap.h"
21 #if wxUSE_IMAGE
22 #include "wx/image.h"
23 #endif
24 #include "wx/dcmemory.h"
25
26
27 //---------------------------------------------------------------------------
28
29
30
31 wxBitmap wxRegion::ConvertToBitmap() const
32 {
33 wxRect box = GetBox();
34 wxBitmap bmp(box.GetRight(), box.GetBottom());
35 wxMemoryDC dc;
36 dc.SelectObject(bmp);
37 dc.SetBackground(*wxBLACK_BRUSH);
38 dc.Clear();
39 dc.SetClippingRegion(*this);
40 dc.SetBackground(*wxWHITE_BRUSH);
41 dc.Clear();
42 dc.SelectObject(wxNullBitmap);
43 return bmp;
44 }
45
46 //---------------------------------------------------------------------------
47
48 #if wxUSE_IMAGE
49 static bool DoRegionUnion(wxRegion& region,
50 const wxImage& image,
51 unsigned char loR,
52 unsigned char loG,
53 unsigned char loB,
54 int tolerance)
55 {
56 unsigned char hiR, hiG, hiB;
57
58 hiR = (unsigned char)wxMin(0xFF, loR + tolerance);
59 hiG = (unsigned char)wxMin(0xFF, loG + tolerance);
60 hiB = (unsigned char)wxMin(0xFF, loB + tolerance);
61
62 // Loop through the image row by row, pixel by pixel, building up
63 // rectangles to add to the region.
64 int width = image.GetWidth();
65 int height = image.GetHeight();
66 for (int y=0; y < height; y++)
67 {
68 wxRect rect;
69 rect.y = y;
70 rect.height = 1;
71
72 for (int x=0; x < width; x++)
73 {
74 // search for a continuous range of non-transparent pixels
75 int x0 = x;
76 while ( x < width)
77 {
78 unsigned char R = image.GetRed(x,y);
79 unsigned char G = image.GetGreen(x,y);
80 unsigned char B = image.GetBlue(x,y);
81 if (( R >= loR && R <= hiR) &&
82 ( G >= loG && G <= hiG) &&
83 ( B >= loB && B <= hiB)) // It's transparent
84 break;
85 x++;
86 }
87
88 // Add the run of non-transparent pixels (if any) to the region
89 if (x > x0) {
90 rect.x = x0;
91 rect.width = x - x0;
92 region.Union(rect);
93 }
94 }
95 }
96
97 return true;
98 }
99
100
101 bool wxRegion::Union(const wxBitmap& bmp)
102 {
103 #if (!defined(__WXMSW__) || wxUSE_WXDIB)
104 if (bmp.GetMask())
105 {
106 wxImage image = bmp.ConvertToImage();
107 wxASSERT_MSG( image.HasMask(), _T("wxBitmap::ConvertToImage doesn't preserve mask?") );
108 return DoRegionUnion(*this, image,
109 image.GetMaskRed(),
110 image.GetMaskGreen(),
111 image.GetMaskBlue(),
112 0);
113 }
114 else
115 #endif
116 {
117 return Union(0, 0, bmp.GetWidth(), bmp.GetHeight());
118 }
119 }
120
121 bool wxRegion::Union(const wxBitmap& bmp,
122 const wxColour& transColour,
123 int tolerance)
124 {
125 #if (!defined(__WXMSW__) || wxUSE_WXDIB)
126 wxImage image = bmp.ConvertToImage();
127 return DoRegionUnion(*this, image,
128 transColour.Red(),
129 transColour.Green(),
130 transColour.Blue(),
131 tolerance);
132 #else
133 return false;
134 #endif
135 }
136
137 #else
138
139 bool wxRegion::Union(const wxBitmap& WXUNUSED(bmp))
140 {
141 // No wxImage support
142 return false;
143 }
144
145 bool wxRegion::Union(const wxBitmap& WXUNUSED(bmp),
146 const wxColour& WXUNUSED(transColour),
147 int WXUNUSED(tolerance))
148 {
149 // No wxImage support
150 return false;
151 }
152
153 #endif
154
155 //---------------------------------------------------------------------------