155ecd4c42
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39957 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
151 lines
4.0 KiB
C++
151 lines
4.0 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: src/common/rgncmn.cpp
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// Purpose: Methods of wxRegion that have a generic implementation
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// Author: Robin Dunn
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// Modified by:
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// Created: 27-Mar-2003
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// RCS-ID: $Id$
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// Copyright: (c) Robin Dunn
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#include "wx/region.h"
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#ifndef WX_PRECOMP
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#include "wx/dcmemory.h"
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#include "wx/bitmap.h"
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#include "wx/image.h"
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#endif //WX_PRECOMP
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wxBitmap wxRegion::ConvertToBitmap() const
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{
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wxRect box = GetBox();
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wxBitmap bmp(box.GetRight(), box.GetBottom());
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wxMemoryDC dc;
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dc.SelectObject(bmp);
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dc.SetBackground(*wxBLACK_BRUSH);
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dc.Clear();
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dc.SetClippingRegion(*this);
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dc.SetBackground(*wxWHITE_BRUSH);
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dc.Clear();
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dc.SelectObject(wxNullBitmap);
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return bmp;
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}
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//---------------------------------------------------------------------------
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#if wxUSE_IMAGE
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static bool DoRegionUnion(wxRegion& region,
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const wxImage& image,
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unsigned char loR,
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unsigned char loG,
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unsigned char loB,
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int tolerance)
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{
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unsigned char hiR, hiG, hiB;
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hiR = (unsigned char)wxMin(0xFF, loR + tolerance);
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hiG = (unsigned char)wxMin(0xFF, loG + tolerance);
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hiB = (unsigned char)wxMin(0xFF, loB + tolerance);
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// Loop through the image row by row, pixel by pixel, building up
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// rectangles to add to the region.
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int width = image.GetWidth();
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int height = image.GetHeight();
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for (int y=0; y < height; y++)
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{
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wxRect rect;
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rect.y = y;
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rect.height = 1;
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for (int x=0; x < width; x++)
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{
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// search for a continuous range of non-transparent pixels
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int x0 = x;
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while ( x < width)
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{
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unsigned char R = image.GetRed(x,y);
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unsigned char G = image.GetGreen(x,y);
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unsigned char B = image.GetBlue(x,y);
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if (( R >= loR && R <= hiR) &&
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( G >= loG && G <= hiG) &&
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( B >= loB && B <= hiB)) // It's transparent
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break;
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x++;
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}
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// Add the run of non-transparent pixels (if any) to the region
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if (x > x0) {
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rect.x = x0;
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rect.width = x - x0;
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region.Union(rect);
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}
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}
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}
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return true;
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}
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bool wxRegion::Union(const wxBitmap& bmp)
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{
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#if (!defined(__WXMSW__) || wxUSE_WXDIB)
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if (bmp.GetMask())
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{
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wxImage image = bmp.ConvertToImage();
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wxASSERT_MSG( image.HasMask(), _T("wxBitmap::ConvertToImage doesn't preserve mask?") );
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return DoRegionUnion(*this, image,
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image.GetMaskRed(),
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image.GetMaskGreen(),
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image.GetMaskBlue(),
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0);
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}
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else
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#endif
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{
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return Union(0, 0, bmp.GetWidth(), bmp.GetHeight());
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}
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}
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bool wxRegion::Union(const wxBitmap& bmp,
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const wxColour& transColour,
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int tolerance)
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{
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#if (!defined(__WXMSW__) || wxUSE_WXDIB)
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wxImage image = bmp.ConvertToImage();
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return DoRegionUnion(*this, image,
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transColour.Red(),
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transColour.Green(),
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transColour.Blue(),
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tolerance);
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#else
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return false;
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#endif
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}
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#else
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bool wxRegion::Union(const wxBitmap& WXUNUSED(bmp))
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{
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// No wxImage support
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return false;
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}
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bool wxRegion::Union(const wxBitmap& WXUNUSED(bmp),
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const wxColour& WXUNUSED(transColour),
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int WXUNUSED(tolerance))
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{
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// No wxImage support
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return false;
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}
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#endif
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