Could you please try example I sent on Linux and explain why font size doesn't match rectangle size? Maybe the ft font engine has bug?
śr., 17 paź 2018, 19:07 użytkownik Allan Sandfeld Jensen <k...@carewolf.com> napisał: > Hi > > That is a incorrect assesment. Fonts are rendered in pixel sizes. When you > request a QFont at a certain pixel size you get the font in that size. It > should be noted that those sizes ONLY matter for things like pixel hinting. > The font will typically be rendered in the same size it was requested, but > in > some cases a specific font-size is used at a different resolution (for > instance with hidpi modes), in that case pixel-hinting is disable, and we > do > vector based rendering of the glyphs. > > In any case the DPI is irrelevant and only matters if you select fonts by > point instead of pixels, and then the translation to pixels is done before > we > get anywhere near the font engine. > > 'Allan > > On Mittwoch, 17. Oktober 2018 17:59:26 CEST Tomasz Olszak wrote: > > Hi, > > > > I would like just to ensure that I missed something and there is > > documentation somewhere informing that Linux fonts are rendered > > *always* in 72 dpi > > ( > https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#F > > T_Set_Char_Size) (which makes font.pixelSize inaccurate for regular > > screens). > > > > I found: https://bugreports.qt.io/browse/QTBUG-8890 which fixes the > > problem but it was rejected. I see the default 72 dpi is also used in > > current Qt 5.11 FT engine > > ( > https://code.woboq.org/qt5/qtbase/src/platformsupport/fontdatabases/freetyp > > e/qfontengine_ft.cpp.html#297). > > > > Does it surprise any of Qt developers or is it only me? Am I right > > thinking that when we do following: > > Rectangle { > > height: 100 > > Text {font.pixelSize: 100} > > } > > then the relation between height of text and height of rectangle will > > differ depending on screen dpi (don't have a way to test it > > currently)? > > > > Moreover I'm pretty sure that's the cause I very often use > > Text.fontSizeMode: Text.Fit because setting pixelSize to height of > > desired text size never worked correctly :) > > > > tl;dr: Is it a bug? > > _______________________________________________ > > Development mailing list > > Development@qt-project.org > > http://lists.qt-project.org/mailman/listinfo/development > > > > > _______________________________________________ > Development mailing list > Development@qt-project.org > http://lists.qt-project.org/mailman/listinfo/development >
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