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Make DpiScaler entirely dependent on absolute font height in px :C

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Teo Mrnjavac
2013-07-30 20:28:23 +02:00
parent 95c8d53b96
commit 00cb5fafe2
2 changed files with 14 additions and 14 deletions
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26
src/libtomahawk/utils/DpiScaler.cpp
View File

@@ -92,44 +92,44 @@ DpiScaler::scaledY( const QPaintDevice* pd, int y )
qreal
DpiScaler::ratioX( const QPaintDevice* pd )
{
qreal basePpp = s_baseDpi / 72.; //72*(1.333)=96 dpi
qreal ratioFromPpp = getPpp() / basePpp;
qreal ratioFromFH = ratioFromFontHeight();
qreal ratioYFromDpi = pd->logicalDpiY() / s_baseDpi; //using Y because we compare with height
//if the error is less than 1%, we trust that the logical DPI setting has the best value
if ( qAbs( ratioFromPpp / ratioYFromDpi - 1 ) < 0.01 )
if ( qAbs( ratioFromFH / ratioYFromDpi - 1 ) < 0.01 )
return pd->logicalDpiX() / s_baseDpi;
else
return ratioFromPpp;
return ratioFromFH;
}
qreal
DpiScaler::ratioY( const QPaintDevice* pd )
{
qreal basePpp = s_baseDpi / 72.; //72*(1.333)=96 dpi
qreal ratioFromPpp = getPpp() / basePpp;
qreal ratioFromFH = ratioFromFontHeight();
qreal ratioYFromDpi = pd->logicalDpiY() / s_baseDpi; //using Y because we compare with height
//if the error is less than 1%, we trust that the logical DPI setting has the best value
if ( qAbs( ratioFromPpp / ratioYFromDpi - 1 ) < 0.01 )
if ( qAbs( ratioFromFH / ratioYFromDpi - 1 ) < 0.01 )
return ratioYFromDpi;
else
return ratioFromPpp;
return ratioFromFH;
}
qreal
DpiScaler::getPpp()
DpiScaler::ratioFromFontHeight()
{
int fS = TomahawkUtils::defaultFontSize();
QFont f;
f.setPointSize( fS );
int fH = QFontMetrics( f ).ascent() + 1; //a font's em-height should be ascent + 1px (baseline)
qreal ppp = fH / (qreal)fS; //pixels per point
return ppp;
qreal basePpp = s_baseDpi / 72.; //72*(1.333)=96 dpi
qreal baseFontHeight = 7 * basePpp; //we assume a minimum font size of 7pt
qreal ratioFromFontHeights = qMax( fH / baseFontHeight, 1. );
return ratioFromFontHeights;
}

2
src/libtomahawk/utils/DpiScaler.h
View File

@@ -52,7 +52,7 @@ public:
private:
inline static qreal ratioX( const QPaintDevice* pd );
inline static qreal ratioY( const QPaintDevice* pd );
inline static qreal getPpp();
inline static qreal ratioFromFontHeight();
qreal m_ratioX;
qreal m_ratioY;