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Improved icon scaling quality

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This commit is contained in:
JulianSmart
2017-05-23 17:11:38 +01:00
parent 2f7adacb9d
commit 0fd3845141
1 changed files with 34 additions and 5 deletions
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39
src/generic/dirctrlg.cpp
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@@ -1536,6 +1536,8 @@ wxImageList *wxFileIconsTable::GetSmallImageList()
return m_smallImageList;
}
// This function is currently not unused anymore
#if 0
#if wxUSE_MIMETYPE && wxUSE_IMAGE && (!defined(__WINDOWS__) || wxUSE_WXDIB)
// VS: we don't need this function w/o wxMimeTypesManager because we'll only have
// one icon and we won't resize it
@@ -1593,7 +1595,9 @@ static wxBitmap CreateAntialiasedBitmap(const wxImage& img, const wxSize& sz)
return wxBitmap(smallimg);
}
#endif
// #if 0
// This function is currently not unused anymore
#if 0
// finds empty borders and return non-empty area of image:
@@ -1701,11 +1705,36 @@ int wxFileIconsTable::GetIconID(const wxString& extension, const wxString& mime)
{
wxImage img = bmp.ConvertToImage();
if ((img.GetWidth() != size*2) || (img.GetHeight() != size*2))
// m_smallImageList->Add(CreateAntialiasedBitmap(CutEmptyBorders(img).Rescale(size*2, size*2)));
m_smallImageList->Add(CreateAntialiasedBitmap(img.Rescale(size*2, size*2), m_size));
if (img.HasMask())
img.InitAlpha();
wxBitmap bmp2;
if ((img.GetWidth() != size) || (img.GetHeight() != size))
{
#if defined(__WXOSX_COCOA__)
if (wxOSXGetMainScreenContentScaleFactor() > 1.0)
{
img.Rescale(2*size, 2*size, wxIMAGE_QUALITY_HIGH);
bmp2 = wxBitmap(img, -1, 2.0);
}
else
#endif
{
// Double, using normal quality scaling.
img.Rescale(2*img.GetWidth(), 2*img.GetHeight());
// Then scale to the desired size. This gives the best quality,
// and better than CreateAntialiasedBitmap.
if ((img.GetWidth() != size) || (img.GetHeight() != size))
img.Rescale(size, size, wxIMAGE_QUALITY_HIGH);
bmp2 = wxBitmap(img);
}
}
else
m_smallImageList->Add(CreateAntialiasedBitmap(img, m_size));
bmp2 = wxBitmap(img);
m_smallImageList->Add(bmp2);
}
#endif // wxUSE_IMAGE