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  1. Qt
  2. QTBUG-102244

In macos 10.15, using CMake's MACOSX_BUNDLE causes qt5.12.11 to get devicePixelRatio of 1?

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P3: Somewhat important
    • Resolution: Incomplete
    • Affects Version/s: 5.12.11
    • Fix Version/s: None
    • Labels:
      None
    • Environment:
      - LG 27", 4k
      - MacOS 10.15.5 (In a virtual machine in win10 21H2)
      - Qt 5.12.11
      - CMake 3.22.2
    • Platform/s:
      macOS

      Description

      CMake add to MACOSX_BUNDLE to use, I can build to get the .app folder, but Qt5.12.11 show devicePixelRatio: 1 (expected should be 2).

      But when I block the MACOSX_BUNDLE macro, I can't build to get the .app folder, but Qt5.12.11 show devicePixelRatio: 2 (as expected).

      This has been confusing me for over a month and I don't know if this is a Qt bug or a CMake bug? Does anyone know the answer?

      In macos systems with high resolution display (Retina Display), the device pixel ratio is usually 2.

       

      ENV:

      • LG 27", 4k
      • MacOS 10.15.5 (In a virtual machine in win10 21H2)
      • Qt 5.12.11
      • CMake 3.22.2

       

      Deam:

      // CMakeLists.txt
      cmake_minimum_required(VERSION 3.5)project(Example VERSION 0.1 LANGUAGES CXX)set(CMAKE_INCLUDE_CURRENT_DIR ON)set(CMAKE_AUTOUIC ON)
      set(CMAKE_AUTOMOC ON)
      set(CMAKE_AUTORCC ON)set(CMAKE_CXX_STANDARD 17)
      set(CMAKE_CXX_STANDARD_REQUIRED ON)find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED)
      find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Widgets REQUIRED)set(PROJECT_SOURCES
              main.cpp
      )if (APPLE)
      #    add_executable(Example MACOSX_BUNDLE ${PROJECT_SOURCES})   # devicePixelRatio: 1 ???
          add_executable(Example ${PROJECT_SOURCES})                # devicePixelRatio: 2   not build .app
      else()
      #    add_executable(Example WIN32 ${PROJECT_SOURCES})
      endif()target_link_libraries(Example PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)
      
      // main.cpp
      #include <QApplication>
      #include <QScreen>
      #include <QDebug>int main(int argc, char *argv[])
      {
          QApplication a(argc, argv);    qDebug()<< "devicePixelRatio:" <<QApplication::primaryScreen()->devicePixelRatio();    return a.exec();
      }
      

       

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          xmuli tech
        2. code.zip
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            Assignee:
            qtbuildsystem Qt Build System Team
            Reporter:
            xmuli xmuli tech
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              Created:
              Updated:
              Resolved:

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