cheng/wxWidgets
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Work around poor image scaling on WIN32, especially on HiDPI displays where all images without size specification will be scaled

Browse Source
This commit is contained in:
JulianSmart 2015-11-29 20:01:10 +00:00
parent c3ae2fc54a
commit f8bc9abfc4
1 changed files with 19 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
src/html/m_image.cpp
View File

@ -465,17 +465,7 @@ void wxHtmlImageCell::SetImage(const wxImage& img)
if ( m_bmpH == wxDefaultCoord)
m_bmpH = hh;
// Only scale the bitmap at the rendering stage,
// so we don't lose quality twice
/*
if ((m_bmpW != ww) || (m_bmpH != hh))
{
wxImage img2 = img.Scale(m_bmpW, m_bmpH);
m_bitmap = new wxBitmap(img2);
}
else
*/
m_bitmap = new wxBitmap(img);
m_bitmap = new wxBitmap(img);
}
#endif
}
@ -605,6 +595,24 @@ void wxHtmlImageCell::Draw(wxDC& dc, int x, int y,
// and height, so we only do the scaling once.
double imageScaleX = 1.0;
double imageScaleY = 1.0;
// Optimisation for Windows: WIN32 scaling for window DCs is very poor,
// so unless we're using a printer DC, do the scaling ourselves.
#ifdef __WXMSW__
if (m_Width >= 0 && m_Width != m_bitmap->GetWidth() && !dc.IsKindOf(CLASSINFO(wxPrinterDC)))
{
wxImage image(m_bitmap->ConvertToImage());
if (image.HasMask())
{
// Convert the mask to an alpha channel or scaling won't work correctly
image.InitAlpha();
}
image.Rescale(m_Width, m_Height, wxIMAGE_QUALITY_HIGH);
delete m_bitmap;
m_bitmap = new wxBitmap(image);
}
#endif
if (m_Width != m_bitmap->GetWidth())
imageScaleX = (double) m_Width / (double) m_bitmap->GetWidth();
if (m_Height != m_bitmap->GetHeight())