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adjust Blit destination rect if source rect is clipped

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70844 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Paul Cornett 2012-03-08 17:06:06 +00:00
parent 32b183b578
commit be88fea9ea
1 changed files with 14 additions and 2 deletions
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16
src/common/dcgraph.cpp
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@ -903,6 +903,7 @@ bool wxGCDCImpl::DoStretchBlit(
source->LogicalToDeviceY(ysrc),
source->LogicalToDeviceXRel(srcWidth),
source->LogicalToDeviceYRel(srcHeight));
const wxRect subrectOrig = subrect;
// clip the subrect down to the size of the source DC
wxRect clip;
source->GetSize(&clip.width, &clip.height);
@ -934,8 +935,19 @@ bool wxGCDCImpl::DoStretchBlit(
if ( !useMask && blit.GetMask() )
blit.SetMask(NULL);
m_graphicContext->DrawBitmap( blit, xdest, ydest,
dstWidth, dstHeight);
double x = xdest;
double y = ydest;
double w = dstWidth;
double h = dstHeight;
// adjust dest rect if source rect is clipped
if (subrect.width != subrectOrig.width || subrect.height != subrectOrig.height)
{
x += (subrect.x - subrectOrig.x) / double(subrectOrig.width) * dstWidth;
y += (subrect.y - subrectOrig.y) / double(subrectOrig.height) * dstHeight;
w *= double(subrect.width) / subrectOrig.width;
h *= double(subrect.height) / subrectOrig.height;
}
m_graphicContext->DrawBitmap(blit, x, y, w, h);
}
else
{