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improved thumbnail quality

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udaken 2017-07-21 21:00:22 +09:00
commit b6e7fbdab4
1 changed files with 30 additions and 1 deletions
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31
CBXShell/cbxArchive.h
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@ -624,6 +624,34 @@ private:
return TRUE;
}
static inline BOOL Draw(
CImage ci,
_In_ HDC hDestDC,
_In_ int xDest,
_In_ int yDest,
_In_ int nDestWidth,
_In_ int nDestHeight,
_In_ int xSrc,
_In_ int ySrc,
_In_ int nSrcWidth,
_In_ int nSrcHeight,
_In_ Gdiplus::InterpolationMode interpolationMode) throw()
{
Gdiplus::Bitmap bm((HBITMAP)ci, NULL);
if (bm.GetLastStatus() != Gdiplus::Ok)
{
return FALSE;
}
Gdiplus::Graphics dcDst(hDestDC);
dcDst.SetInterpolationMode(interpolationMode);
Gdiplus::Rect destRec(xDest, yDest, nDestWidth, nDestHeight);
Gdiplus::Status status = dcDst.DrawImage(&bm, destRec, xSrc, ySrc, nSrcWidth, nSrcHeight, Gdiplus::Unit::UnitPixel);
return status == Gdiplus::Ok;
}
HBITMAP ThumbnailFromIStream(IStream* pIs, const LPSIZE pThumbSize)
{
@ -656,7 +684,8 @@ private:
HBITMAP hbmpOld=hdcNew.SelectBitmap(hbmpNew);
hdcNew.FillSolidRect(0,0, tw,th, RGB(255,255,255));//white background
ci.Draw(hdcNew, 0,0, tw,th, 0,0, ci.GetWidth(),ci.GetHeight());//too late for error checks
RECT rect = { 0,0, ci.GetWidth(),ci.GetHeight() };
Draw(ci, hdcNew, 0, 0, tw, th, 0, 0, ci.GetWidth(), ci.GetHeight(), Gdiplus::InterpolationMode::InterpolationModeHighQualityBicubic);//too late for error checks
hdcNew.SelectBitmap(hbmpOld);
return hbmpNew.Detach();