There can be cases where different results are obtained between the following a and b.

a) Drawing text directly on a QPainter object using QPainter::drawText()

b) Drawing text inside another QPicture object using QPainter::drawText(), and then drawing that QPicture onto the QPainter object with drawPicture().

Under the following conditions, when using method b, the text is drawn shifted from its original position (see CooperBlack_Bravura_mac.png, CooperBlack_Bravura_windows.png) :

• A substitute font is set for the font used in the text (default font).
• The text contains a character for which the default font has no glyph, so the substitute font is used.

This issue has been reproduced on Mac OS 14 and Windows 11.

Reproduction steps:

1. Ensure the 'Cooper Black' font is installed in your environment.
2. Install the attached 'Bravura' font (from Dorico application, and freely available here: https://github.com/steinbergmedia/bravura )
3. Build and run the attached 'qpicture-font-substitution-test' app in Qt Creator.
4. Observe that the 'musical notes' symbol (unicode 0x266B) appears at a different position relative to the line when drawn directly with QPainter::drawText at the top, and when drawn via QPicture at the bottom.

Additional note:

• The font metrics checked on Windows 11 for Cooper Black and Bravura were as follows.

default font family: "Cooper"
default font pointSize: 64
font metrics:
  ascent 78
  descent 19
  height 97
  lineSpacing 97
  lineWidth 11
  overlinePos 79
  underlinePos 4

substitute font family: "Bravura"
substitute font pointSize: 64
font metrics:
  ascent 171
  descent 171
  height 342
  lineSpacing 342
  lineWidth 4
  overlinePos 172
  underlinePos 2 

• The issue was not reproduced when a different font, which has a glyph for unicode 0x266B, was used as the substitute (e.g. "Yu Gothic UI", see CooperBlack_YuGothicUI_windows.png) .