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use StretchDIBits() if we're drawing a DIB and not a DDB in Blit()

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19789 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2003-03-24 23:10:41 +00:00
parent 2f52b4e15c
commit d80f416f62
1 changed files with 70 additions and 26 deletions
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96
src/msw/dc.cpp
View File

@@ -1828,13 +1828,14 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
if (!GetHDC()) return FALSE;
#endif
const wxBitmap& bmpSrc = source->m_selectedBitmap;
wxMask *mask = NULL;
if ( useMask )
{
const wxBitmap& bmp = source->m_selectedBitmap;
mask = bmp.GetMask();
mask = bmpSrc.GetMask();
if ( !(bmp.Ok() && mask && mask->GetMaskBitmap()) )
if ( !(bmpSrc.Ok() && mask && mask->GetMaskBitmap()) )
{
// don't give assert here because this would break existing
// programs - just silently ignore useMask parameter
@@ -1998,36 +1999,79 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
}
else // no mask, just BitBlt() it
{
// use StretchBlt() if available
if ( ::GetDeviceCaps(GetHdc(), RASTERCAPS) & RC_STRETCHBLT )
// if we already have a DIB, draw it using StretchDIBits(), otherwise
// use StretchBlt() if available and finally fall back to BitBlt()
const int caps = ::GetDeviceCaps(GetHdc(), RASTERCAPS);
if ( bmpSrc.Ok() && (caps & RC_STRETCHDIB) )
{
DIBSECTION ds;
wxZeroMemory(ds);
if ( ::GetObject(GetHbitmapOf(bmpSrc),
sizeof(ds),
&ds) == sizeof(ds) )
{
StretchBltModeChanger changeMode(GetHdc(), COLORONCOLOR);
if ( ::StretchDIBits(GetHdc(),
xdest, ydest,
width, height,
0, 0,
width, height,
ds.dsBm.bmBits,
(LPBITMAPINFO)&ds.dsBmih,
DIB_RGB_COLORS,
SRCCOPY
) == (int)GDI_ERROR )
{
wxLogLastError(wxT("StretchDIBits"));
}
else
{
success = TRUE;
}
}
}
if ( !success && (caps & RC_STRETCHBLT) )
{
StretchBltModeChanger changeMode(GetHdc(), COLORONCOLOR);
success = ::StretchBlt
(
GetHdc(),
xdest, ydest, width, height,
GetHdcOf(*source),
xsrc, ysrc, width, height,
dwRop
) != 0;
}
else
{
success = ::BitBlt
(
GetHdc(),
xdest, ydest,
(int)width, (int)height,
GetHdcOf(*source),
xsrc, ysrc,
dwRop
) != 0;
if ( !::StretchBlt
(
GetHdc(),
xdest, ydest, width, height,
GetHdcOf(*source),
xsrc, ysrc, width, height,
dwRop
) )
{
wxLogLastError(_T("StretchBlt"));
}
else
{
success = TRUE;
}
}
if ( !success )
{
wxLogLastError(wxT("BitBlt/StretchBlt"));
if ( !::BitBlt
(
GetHdc(),
xdest, ydest,
(int)width, (int)height,
GetHdcOf(*source),
xsrc, ysrc,
dwRop
) )
{
wxLogLastError(_T("BitBlt"));
}
else
{
success = TRUE;
}
}
}