Set internal unit to 1/100 of millimetre

In theory, this unit is entirely arbitrary, so we could also set it to 1mm (that would make debugging nicer, cause every number we see represents millimetres). However, that corresponds to a very low DPI value (25.4), which doesn't work nicely with QFontMetrics, and very small scaled point sizes when drawing, which doesn't work nicely with QPainter. This seems the better compromise.

Author: mike-spa

src/engraving/dom/mscore.h

@@ -67,8 +67,11 @@ static constexpr int MAX_FOOTERS = 3;
 static constexpr double INCH      = 25.4; // millimitres per inch
 static constexpr double PPI       = 72.0; // typographical points per inch
 
-static constexpr double DPI       = 1200;
-static constexpr double DPMM      = DPI / INCH;
+// INTERNAL DRAWING UNITS
+// Given that it's ultimately arbitrary, we may as well set our internal units to
+// something that makes them easier to read when debugging, e.g. 1/100 of millimitre.
+static constexpr double DPMM = 100;
+static constexpr double DPI = INCH * DPMM;
 
 // NOTE: the SMuFL default is actually 20pt. We use 10 for historical reasons
 // and back-compatibility, but this will be multiplied x2 during layout.

src/framework/draw/internal/qfontprovider.cpp

@@ -27,7 +27,7 @@
 #include <QFontMetricsF>
 #include <QRawFont>
 
-#include "log.h"
+#include "engraving/dom/mscore.h"
 
 using namespace muse;
 using namespace muse::draw;
@@ -45,7 +45,7 @@ class FontPaintDevice : public QPaintDevice
     {
         switch (m) {
         case QPaintDevice::PdmDpiY:
-            return 1200; // Must be equal to mu::engraving::DPI
+            return mu::engraving::DPI;
         default:
             return 1;
         }