projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| 1542ea39 RD |
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 | #ifdef __GNUG__ | |
| 13 | #pragma implementation "rgncmn.h" | |
| 14 | #endif | |
| 15 | ||
| 16 | ||
| 17 | // For compilers that support precompilation, includes "wx.h". | |
| 18 | #include "wx/wxprec.h" | |
| 19 | ||
| 20 | #ifdef __BORLANDC__ | |
| 21 | #pragma hdrstop | |
| 22 | #endif | |
| 23 | ||
| 24 | #include "wx/region.h" | |
| 25 | #include "wx/bitmap.h" | |
| dd1eb4e3 | 26 | #include "wx/image.h" |
| 1542ea39 RD |
27 | #include "wx/dcmemory.h" |
| 28 | ||
| 29 | ||
| 30 | //--------------------------------------------------------------------------- | |
| 31 | ||
| 32 | ||
| 33 | ||
| 34 | wxBitmap wxRegion::ConvertToBitmap() const | |
| 35 | { | |
| 36 | wxRect box = GetBox(); | |
| 37 | wxBitmap bmp(box.GetRight(), box.GetBottom()); | |
| 38 | wxMemoryDC dc; | |
| 39 | dc.SelectObject(bmp); | |
| 819451b6 | 40 | dc.SetBackground(*wxBLACK_BRUSH); |
| 1542ea39 RD |
41 | dc.Clear(); |
| 42 | dc.SetClippingRegion(*this); | |
| 819451b6 | 43 | dc.SetBackground(*wxWHITE_BRUSH); |
| 1542ea39 RD |
44 | dc.Clear(); |
| 45 | dc.SelectObject(wxNullBitmap); | |
| 46 | return bmp; | |
| 47 | } | |
| 48 | ||
| 49 | //--------------------------------------------------------------------------- | |
| 50 | ||
| 51 | bool wxRegion::Union(const wxBitmap& bmp, | |
| 52 | const wxColour& transColour, | |
| 53 | int tolerance) | |
| 54 | { | |
| 55 | unsigned char loR, loG, loB; | |
| 56 | unsigned char hiR, hiG, hiB; | |
| 57 | ||
| 58 | wxCHECK_MSG((bmp.GetMask() != NULL) || transColour.Ok(), | |
| 59 | FALSE, | |
| 60 | wxT("Either the bitmap should have a mask or a colour should be given.")); | |
| 61 | ||
| 62 | wxImage image = bmp.ConvertToImage(); | |
| 63 | ||
| 64 | if (image.HasMask()) | |
| 65 | { | |
| 66 | loR = image.GetMaskRed(); | |
| 67 | loG = image.GetMaskGreen(); | |
| 68 | loB = image.GetMaskBlue(); | |
| 69 | } | |
| 70 | else | |
| 71 | { | |
| 72 | loR = transColour.Red(); | |
| 73 | loG = transColour.Green(); | |
| 74 | loB = transColour.Blue(); | |
| 75 | } | |
| 76 | ||
| 77 | hiR = wxMin(0xFF, loR + tolerance); | |
| 78 | hiG = wxMin(0xFF, loG + tolerance); | |
| 79 | hiB = wxMin(0xFF, loB + tolerance); | |
| 80 | ||
| 81 | // Loop through the image row by row, pixel by pixel, building up | |
| 82 | // rectangles to add to the region. | |
| 83 | int width = image.GetWidth(); | |
| 84 | int height = image.GetHeight(); | |
| 85 | for (int y=0; y < height; y++) | |
| 86 | { | |
| 87 | wxRect rect; | |
| 88 | rect.y = y; | |
| 89 | rect.height = 1; | |
| 90 | ||
| 91 | for (int x=0; x < width; x++) | |
| 92 | { | |
| 93 | // search for a continuous range of non-transparent pixels | |
| 94 | int x0 = x; | |
| 95 | while ( x < width) | |
| 96 | { | |
| 97 | unsigned char R = image.GetRed(x,y); | |
| 98 | unsigned char G = image.GetGreen(x,y); | |
| 99 | unsigned char B = image.GetBlue(x,y); | |
| 100 | if (( R >= loR && R <= hiR) && | |
| 101 | ( G >= loG && G <= hiG) && | |
| 102 | ( B >= loB && B <= hiB)) // It's transparent | |
| 103 | break; | |
| 104 | x++; | |
| 105 | } | |
| 106 | ||
| 107 | // Add the run of non-transparent pixels (if any) to the region | |
| 108 | if (x > x0) { | |
| 109 | rect.x = x0; | |
| 110 | rect.width = x - x0; | |
| 111 | Union(rect); | |
| 112 | } | |
| 113 | } | |
| 114 | } | |
| 115 | ||
| 116 | return TRUE; | |
| 117 | } | |
| 118 | ||
| 119 | //--------------------------------------------------------------------------- |