| 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 | //--------------------------------------------------------------------------- |