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Add function to get font pointSize from lfHeight at specific DPI

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This commit is contained in:
Maarten Bent
2019-08-25 15:24:31 +02:00
parent e563d4858a
commit 219fa3fa89
2 changed files with 20 additions and 21 deletions
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18
include/wx/fontutil.h
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@@ -120,25 +120,17 @@ public:
#elif defined(__WXMSW__)
wxNativeFontInfo(const LOGFONT& lf_)
: lf(lf_),
pointSize(GetPointSizeFromLogFontHeight(lf.lfHeight))
pointSize(GetPointSizeAtPPI(lf.lfHeight))
{
}
// MSW-specific: get point size from LOGFONT height using the default DPI.
static float GetPointSizeFromLogFontHeight(int height);
// MSW-specific: get point size from LOGFONT height using specified DPI,
// or screen DPI when 0.
static float GetPointSizeAtPPI(int lfHeight, int ppi = 0);
// MSW-specific: get the height value in pixels using LOGFONT convention
// (i.e. negative) corresponding to the given size in points and DPI.
static int GetLogFontHeightAtPPI(float size, int ppi)
{
return -wxRound(size * ppi / 72.0);
}
// And the same thing for the size of this font.
int GetLogFontHeightAtPPI(int ppi) const
{
return GetLogFontHeightAtPPI(pointSize, ppi);
}
static int GetLogFontHeightAtPPI(float size, int ppi);
LOGFONT lf;

23
src/msw/font.cpp
View File

@@ -159,7 +159,8 @@ public:
int GetLogFontHeightAtPPI(int ppi) const
{
return m_nativeFontInfo.GetLogFontHeightAtPPI(ppi);
return m_nativeFontInfo.GetLogFontHeightAtPPI(
m_nativeFontInfo.pointSize, ppi);
}
// ... and setters: notice that all of them invalidate the currently
@@ -403,12 +404,18 @@ void wxFontRefData::Free()
// ----------------------------------------------------------------------------
/* static */
float wxNativeFontInfo::GetPointSizeFromLogFontHeight(int height)
float wxNativeFontInfo::GetPointSizeAtPPI(int lfHeight, int ppi)
{
// Determine the size in points using the primary screen DPI as we don't
// have anything else here.
const float ppi = ::GetDeviceCaps(ScreenHDC(), LOGPIXELSY);
return 72.0f * abs(height) / ppi;
if ( ppi == 0 )
ppi = ::GetDeviceCaps(ScreenHDC(), LOGPIXELSY);
return abs(lfHeight) * 72.0f / ppi;
}
/* static */
int wxNativeFontInfo::GetLogFontHeightAtPPI(float size, int ppi)
{
return -wxRound(size * ppi / 72.0f);
}
void wxNativeFontInfo::Init()
@@ -536,7 +543,7 @@ void wxNativeFontInfo::SetPixelSize(const wxSize& pixelSize)
// We don't have the right DPI to use here neither, but we need to update
// the point size too, so fall back to the default.
pointSize = GetPointSizeFromLogFontHeight(lf.lfHeight);
pointSize = GetPointSizeAtPPI(lf.lfHeight);
}
void wxNativeFontInfo::SetStyle(wxFontStyle style)
@@ -699,7 +706,7 @@ bool wxNativeFontInfo::FromString(const wxString& s)
return false;
lf.lfHeight = l;
if ( setPointSizeFromHeight )
pointSize = GetPointSizeFromLogFontHeight(l);
pointSize = GetPointSizeAtPPI(l);
token = tokenizer.GetNextToken();
if ( !token.ToLong(&l) )