Cross-platform applications can use Qt to display graphical elements. Qt abstracts the platforms' underlying graphics APIs so that developers can focus on the application code.
The Qt Rendering Hardware Interface (RHI) translates 3D graphics call from Qt applications to the available graphics APIs on the target platform.
The supported graphics APIs are:
Qt Quick applications use a 场景图形 for rendering. The scene graph renderer can create efficient graphics calls and increase performance. The scene graph is has an accessible API which gives you the flexibility to create complex but fast graphics.
The pages in the following list contain more information about rendering Qt Quick applications.
Qt uses the target platform's graphics APIs whenever possible, however, it is possible to set up Qt's rendering path with a specific API. In many cases, choosing a specific API can increase performance and allows the developers to deploy on a platform that have a specific graphics API. Visit the 凭借 Qt 渲染硬件接口进行渲染 page on how to set the render path in QQuickWindow .
Qt Quick 3D is an add-on that provides a high-level API for creating 3D content and 3D user interfaces based on Qt Quick. It extends the Qt Quick 场景图形 which lets you implement 3D content on 2D Qt Quick applications.
The Qt Shader Tools provides a tool, QSB , to translate vertex and fragment shaders into a package for Qt Quick interfaces. In particular, the ShaderEffect QML 类型和 QSGMaterial subclasses can use the output of QSB. Qt Quick 3D has its own framework for importing shaders into 3D scenes.
The following list contains information about shader effects.
Qt GUI provides a high level windowing, painting, and typography system. QPainter provides an API for drawing vector graphics, text and images onto different surfaces, or QPaintDevice 实例，譬如 QImage , QOpenGLPaintDevice , QWidget ，和 QPrinter . For Qt Widgets user interfaces, Qt uses a software renderer.
The following list contains information about Qt GUIs high-level drawing APIs.
The Qt OpenGL module is for applications that require OpenGL access. This module is to maintain compatibility with Qt 5 applications and with Qt GUI. For user interfaces that use QWidget , QOpenGLWidget is a widget that can add OpenGL scenes.
Qt 支持直接打印到本地或网络的实际打印机，及产生 PDF 输出。如何采用 Qt 进行打印的详细描述在 Qt Print Support 页面。
Qt 支持图像的方便读取、写入及操纵透过 QImage 类。此外，对于如何更细粒度控制图像的加载或保存，可以使用 QImageReader and QImageWriter 类。为添加由 Qt 所提供的其它图像格式的支持，可以创建图像格式插件通过使用 QImageIOHandler and QImageIOPlugin .
见 读写图像文件 页面，了解更多信息。
