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implement DoStretchBlit() in terms of DoBlit() and SetUserScale()

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44917 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2007-03-19 01:53:53 +00:00
parent 102798af35
commit ce2fe5bc8a
1 changed files with 20 additions and 5 deletions
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25
src/common/dcbase.cpp
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@ -87,16 +87,31 @@ wxDCBase::DoStretchBlit(wxCoord xdest, wxCoord ydest,
wxCoord dstWidth, wxCoord dstHeight,
wxDC *source,
wxCoord xsrc, wxCoord ysrc,
wxCoord WXUNUSED(srcWidth), wxCoord WXUNUSED(srcHeight),
wxCoord srcWidth, wxCoord srcHeight,
int rop,
bool useMask,
wxCoord xsrcMask,
wxCoord ysrcMask)
{
// temporary default implementation to avoid breaking platforms that don't
// have DoStretchBlit
return DoBlit(xdest, ydest, dstWidth, dstHeight, source,
xsrc, ysrc, rop, useMask, xsrcMask, ysrcMask);
wxCHECK_MSG( srcWidth && srcHeight && dstWidth && dstHeight, false,
_T("invalid blit size") );
// emulate the stretching by modifying the DC scale
double xscale = (double)srcWidth/dstWidth,
yscale = (double)srcHeight/dstHeight;
double xscaleOld, yscaleOld;
GetUserScale(&xscaleOld, &yscaleOld);
SetUserScale(xscaleOld/xscale, yscaleOld/yscale);
bool rc = DoBlit(wxCoord(xdest*xscale), wxCoord(ydest*yscale),
wxCoord(dstWidth*xscale), wxCoord(dstHeight*yscale),
source,
xsrc, ysrc, rop, useMask, xsrcMask, ysrcMask);
SetUserScale(xscaleOld, yscaleOld);
return rc;
}
// ----------------------------------------------------------------------------