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Fixed creating wxGraphicsContext from wxMemoryDC with Cairo renderer (wxMSW).

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Create RGB Cairo surface as a fallback if we failed to create ARGB surface for 32bpp wxBitmap.
This commit is contained in:
Artur Wieczorek
2016-04-09 23:47:58 +02:00
parent ac49e3829a
commit 42c08aae12
1 changed files with 21 additions and 7 deletions
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28
src/generic/graphicc.cpp
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@@ -1887,20 +1887,34 @@ wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxMemoryDC&
// We need to pass a pointer to the location
// of the bit values to Cairo function.
BITMAP info;
if (::GetObject(bmp.GetHBITMAP(), sizeof(info), &info) == 0)
if ( ::GetObject(bmp.GetHBITMAP(), sizeof(info), &info) == sizeof(info) )
{
wxLogLastError(wxS("wxCairoContext ctor - GetObject"));
}
wxASSERT_MSG(info.bmBits != NULL, wxS("Invalid bitmap"));
m_mswSurface = cairo_image_surface_create_for_data((unsigned char*)info.bmBits,
if( info.bmBits )
{
m_mswSurface = cairo_image_surface_create_for_data((unsigned char*)info.bmBits,
bmp.HasAlpha() ?
CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24,
info.bmWidth,
info.bmHeight,
info.bmWidthBytes);
hasBitmap = true;
hasBitmap = true;
}
else
{
wxFAIL_MSG( wxS("Invalid bitmap") );
}
}
else
{
wxLogLastError( wxS("wxCairoContext ctor - GetObject") );
}
// Fallback if we failed to create Cairo surface from 32bpp bitmap.
if( !hasBitmap )
{
m_mswSurface = cairo_win32_surface_create(dc.GetHDC());
}
}
Init( cairo_create(m_mswSurface) );