Direct3D introduced programmability in the form of vertex and pixel shaders, enabling developers to write code without worrying about superfluous hardware state, and fog, bump mapping and texture mapping. Windows XP shipped with DirectX 8.1 which brings major new features to DirectX Graphics besides DirectX Audio (both DirectSound and DirectMusic), DirectPlay, DirectInput and DirectShow. The total number of GDI handles per session is also raised in Windows XP from 16384 to 65536 (configurable through the registry). The GDI+ dynamic library can be shipped with an application and used under older versions of Windows. Use of these features is apparent in Windows XP's user interface (transparent desktop icon labels, drop shadows for icon labels on the desktop, shadows under menus, translucent blue selection rectangle in Windows Explorer, sliding task panes and taskbar buttons), and several of its applications such as Microsoft Paint, Windows Picture and Fax Viewer, Photo Printing Wizard, My Pictures Slideshow screensaver, and their presence in the basic graphics layer greatly simplifies implementations of vector-graphics systems such as Flash or SVG. GDI+ uses ARGB values to represent color. GDI+ adds anti-aliased 2D graphics, textures, floating point coordinates, gradient shading, more complex path management, bicubic filtering, intrinsic support for modern graphics-file formats like JPEG and PNG, and support for composition of affine transformations in the 2D view pipeline. With the introduction of Windows XP, the C++ based software-only GDI+ subsystem was introduced to replace certain GDI functions. 10.6 Background Intelligent Transfer Service.10.4 Quality of Service for modems and remote access.10 Networking and communication features.
8.4 Fast user switching and Welcome Screen.7.7 Other hardware and driver improvements.4.3 Side-by-side (SxS) assemblies and Application isolation.1.7 Customization and usability improvements.
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