Font clipping of custom Italic fonts

mystique_

I'm developing an application that will allow users to import new font to render some texts, I was also trying some fonts from Google Fonts but when I use an italic fonts I'm getting clipping issues either in capital letters or in other letters, for example:

What could I try to solve this issue?

This is the font I was trying. but it happened also with other fonts:
https://fonts.google.com/specimen/Inter

Here is some basic code to reproduce this behavior:

import sys
import os
from PySide6.QtWidgets import (
    QApplication,
    QWidget,
    QVBoxLayout,
    QTextEdit,
    QPushButton,
    QLabel 
)
from PySide6.QtGui import QFont, QFontDatabase
from PySide6.QtCore import Qt

class FontTestApp(QWidget):
    def __init__(self, font_path: str):
        super().__init__()
        self.font_path = font_path
        self.init_ui()

    def init_ui(self):
        self.setWindowTitle("PySide6 Custom Font Test")
        self.setGeometry(100, 100, 600, 400)

        layout = QVBoxLayout(self)
        font_family_name = self._load_custom_font()
        self.status_label = QLabel()
        layout.addWidget(self.status_label)

        if font_family_name:
            self.status_label.setText(f"Font '{font_family_name}' loaded successfully.")
            self.text_edit = QTextEdit()
            self.text_edit.setPlainText(
                 "This is a sample text displayed in the custom font.\n"
                 "CCCCCCCCDDDDDDDDDDDEEEEEEEEEEEEEOOOOOOOOOOOO"
                 "Lorem ipsum dolor sit amet, consectetur adipiscing elit. "
                 "Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. "
                 "Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat."
            )
            custom_font = QFont(font_family_name, 12) 
            self.text_edit.setFont(custom_font)
            layout.addWidget(self.text_edit)
        self.close_button = QPushButton("Close")
        self.close_button.clicked.connect(QApplication.instance().quit)
        layout.addWidget(self.close_button)

    def _load_custom_font(self) -> str | None:
        if not os.path.exists(self.font_path):
            print(f"Error: Font file not found at '{self.font_path}'")
            return None

        font_id = QFontDatabase.addApplicationFont(self.font_path)
        if font_id == -1:
            print(f"Error: Could not load font from '{self.font_path}'. It might be corrupted or not a valid TTF.")
            return None

        font_families = QFontDatabase.applicationFontFamilies(font_id)
        if font_families:
            return font_families[0] # Return the first family name found in the font file
        else:
            print(f"Error: No font family names found in '{self.font_path}' after loading.")
            return None

if __name__ == "__main__":
    app = QApplication(sys.argv)
    FONT_FILE = r"Inter-Italic-VariableFont_opsz,wght.ttf"
    main_window = FontTestApp(FONT_FILE)
    main_window.adjustSize() 
    main_window.show()
    sys.exit(app.exec())

SGaist

Hi and welcome to devnet,

Which version of PySide6 are you using ?
On which OS ?
I tried on macOS with PySide 6.9.1 and it worked correctly. I just had to use the addApplicationFontFromData method because for some reason it did not succeed when loading from the file path.

mystique_

This was with PySide6 6.9.2, I also tried with 6.10.0
The OS is Windows 10 22H2