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fix wxBitmap mask copying

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42850 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2006-10-31 14:43:04 +00:00
parent d8f2f99ff7
commit 1b7c01c976
2 changed files with 55 additions and 2 deletions
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3
include/wx/msw/bitmap.h
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@@ -198,6 +198,9 @@ class WXDLLEXPORT wxMask : public wxObject
public:
wxMask();
// Copy constructor
wxMask(const wxMask &mask);
// Construct a mask from a bitmap and a colour indicating the transparent
// area
wxMask(const wxBitmap& bitmap, const wxColour& colour);

54
src/msw/bitmap.cpp
View File

@@ -205,8 +205,13 @@ wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
m_selectedInto = NULL;
#endif
// can't copy the mask as the other bitmap destroys it
// (deep) copy the mask if present
m_bitmapMask = NULL;
if (data.m_bitmapMask)
m_bitmapMask = new wxMask(*data.m_bitmapMask);
// FIXME: we don't copy m_hBitmap currently but we should, see wxBitmap::
// CloneRefData()
wxASSERT_MSG( !data.m_isDIB,
_T("can't copy bitmap locked for raw access!") );
@@ -252,6 +257,10 @@ wxObjectRefData *wxBitmap::CloneRefData(const wxObjectRefData *dataOrig) const
if ( !data )
return NULL;
// FIXME: this method is backwards, it should just create a new
// wxBitmapRefData using its copy ctor but instead it modifies this
// bitmap itself and then returns its m_refData -- which works, of
// course (except in !wxUSE_WXDIB), but is completely illogical
wxBitmap *self = wx_const_cast(wxBitmap *, this);
#if wxUSE_WXDIB
@@ -264,10 +273,19 @@ wxObjectRefData *wxBitmap::CloneRefData(const wxObjectRefData *dataOrig) const
else
#endif // wxUSE_WXDIB
{
// don't copy the bitmap data, but do copy the size, depth, ...
// copy the bitmap data
self->m_refData = new wxBitmapRefData(*data);
}
// copy also the mask
wxMask * const maskSrc = data->GetMask();
if ( maskSrc )
{
wxBitmapRefData *selfdata = wx_static_cast(wxBitmapRefData *, m_refData);
selfdata->SetMask(new wxMask(*maskSrc));
}
return m_refData;
}
@@ -1327,6 +1345,38 @@ wxMask::wxMask()
m_maskBitmap = 0;
}
// Copy constructor
wxMask::wxMask(const wxMask &mask)
{
BITMAP bmp;
HDC srcDC = CreateCompatibleDC(0);
HDC destDC = CreateCompatibleDC(0);
// GetBitmapDimensionEx won't work if SetBitmapDimensionEx wasn't used
// so we'll use GetObject() API here:
if (::GetObject((HGDIOBJ)mask.m_maskBitmap, sizeof(bmp), &bmp) == 0)
{
wxFAIL_MSG(wxT("Cannot retrieve the dimensions of the wxMask to copy"));
return;
}
// create our HBITMAP
int w = bmp.bmWidth, h = bmp.bmHeight;
m_maskBitmap = (WXHBITMAP)CreateCompatibleBitmap(srcDC, w, h);
// copy the mask's HBITMAP into our HBITMAP
SelectObject(srcDC, (HBITMAP) mask.m_maskBitmap);
SelectObject(destDC, (HBITMAP) m_maskBitmap);
BitBlt(destDC, 0, 0, w, h, srcDC, 0, 0, SRCCOPY);
SelectObject(srcDC, 0);
DeleteDC(srcDC);
SelectObject(destDC, 0);
DeleteDC(destDC);
}
// Construct a mask from a bitmap and a colour indicating
// the transparent area
wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)