| 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 | #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) |
| 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" |
| 26 | #if wxUSE_IMAGE |
| 27 | #include "wx/image.h" |
| 28 | #endif |
| 29 | #include "wx/dcmemory.h" |
| 30 | |
| 31 | |
| 32 | //--------------------------------------------------------------------------- |
| 33 | |
| 34 | |
| 35 | |
| 36 | wxBitmap wxRegion::ConvertToBitmap() const |
| 37 | { |
| 38 | wxRect box = GetBox(); |
| 39 | wxBitmap bmp(box.GetRight(), box.GetBottom()); |
| 40 | wxMemoryDC dc; |
| 41 | dc.SelectObject(bmp); |
| 42 | dc.SetBackground(*wxBLACK_BRUSH); |
| 43 | dc.Clear(); |
| 44 | dc.SetClippingRegion(*this); |
| 45 | dc.SetBackground(*wxWHITE_BRUSH); |
| 46 | dc.Clear(); |
| 47 | dc.SelectObject(wxNullBitmap); |
| 48 | return bmp; |
| 49 | } |
| 50 | |
| 51 | //--------------------------------------------------------------------------- |
| 52 | |
| 53 | bool wxRegion::Union(const wxBitmap& bmp, |
| 54 | const wxColour& transColour, |
| 55 | int tolerance) |
| 56 | { |
| 57 | #if wxUSE_IMAGE |
| 58 | unsigned char loR, loG, loB; |
| 59 | unsigned char hiR, hiG, hiB; |
| 60 | |
| 61 | wxCHECK_MSG((bmp.GetMask() != NULL) || transColour.Ok(), |
| 62 | FALSE, |
| 63 | wxT("Either the bitmap should have a mask or a colour should be given.")); |
| 64 | |
| 65 | wxImage image = bmp.ConvertToImage(); |
| 66 | |
| 67 | if (image.HasMask()) |
| 68 | { |
| 69 | loR = image.GetMaskRed(); |
| 70 | loG = image.GetMaskGreen(); |
| 71 | loB = image.GetMaskBlue(); |
| 72 | } |
| 73 | else |
| 74 | { |
| 75 | loR = transColour.Red(); |
| 76 | loG = transColour.Green(); |
| 77 | loB = transColour.Blue(); |
| 78 | } |
| 79 | |
| 80 | hiR = wxMin(0xFF, loR + tolerance); |
| 81 | hiG = wxMin(0xFF, loG + tolerance); |
| 82 | hiB = wxMin(0xFF, loB + tolerance); |
| 83 | |
| 84 | // Loop through the image row by row, pixel by pixel, building up |
| 85 | // rectangles to add to the region. |
| 86 | int width = image.GetWidth(); |
| 87 | int height = image.GetHeight(); |
| 88 | for (int y=0; y < height; y++) |
| 89 | { |
| 90 | wxRect rect; |
| 91 | rect.y = y; |
| 92 | rect.height = 1; |
| 93 | |
| 94 | for (int x=0; x < width; x++) |
| 95 | { |
| 96 | // search for a continuous range of non-transparent pixels |
| 97 | int x0 = x; |
| 98 | while ( x < width) |
| 99 | { |
| 100 | unsigned char R = image.GetRed(x,y); |
| 101 | unsigned char G = image.GetGreen(x,y); |
| 102 | unsigned char B = image.GetBlue(x,y); |
| 103 | if (( R >= loR && R <= hiR) && |
| 104 | ( G >= loG && G <= hiG) && |
| 105 | ( B >= loB && B <= hiB)) // It's transparent |
| 106 | break; |
| 107 | x++; |
| 108 | } |
| 109 | |
| 110 | // Add the run of non-transparent pixels (if any) to the region |
| 111 | if (x > x0) { |
| 112 | rect.x = x0; |
| 113 | rect.width = x - x0; |
| 114 | Union(rect); |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | return TRUE; |
| 120 | #else |
| 121 | // No wxImage support |
| 122 | return FALSE; |
| 123 | #endif |
| 124 | } |
| 125 | |
| 126 | //--------------------------------------------------------------------------- |