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From Wikipedia, the free encyclopedia
DirectWrite is a text-layout and glyph-rendering API by Microsoft. It was designed to replace GDI/GDI+ and Uniscribe for screen-oriented rendering[citation needed] and was shipped with Windows 7 and Windows Server 2008 R2, as well as Windows Vista and Windows Server 2008 (with Platform Update installed[1] and Platform Update Supplement for Windows Vista and for Windows Server 2008(KB2117917)[2] & KB2505189[3] update installed.
Microsoft has fixed many DirectWrite bugs in Windows 7 through Windows 7 Service Pack 1(SP1)[4] and KB2505438 update[5].
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[edit] Features
- Comprehensive support for Unicode, with over 20 scripts providing layout and rendering of every language supported in Windows. DirectWrite supports measuring, drawing, and hit-testing of multi-format text. Supported Unicode features include BIDI, line breaking, surrogates, UVS, language-guided script itemization, number substitution, and glyph shaping.
- Sub-pixel ClearType text rendering with bi-directional antialiasing which can interoperate with GDI/GDI+, Direct2D/Direct3D and any application-specific technology. When using with Direct2D, text rendering can be hardware-accelerated or can use WARP software rasterizer when hardware acceleration is not available. It is, however, unable to render aliased (or bi-level) text.
- Supports advanced typographic features of OpenType, such as stylistic alternates and swashes, which were never supported in GDI and WinForms.
- Provides a low-level glyph rendering API for those who employ proprietary text layout and Unicode-to-glyph processing.
[edit] Supported scripts
‡ No default system font provided in Windows. Braille, Ogham, and Runic are supported by Segoe UI Symbol.
[edit] See also
- Pango a cross platform library for rendering text in high quality, emphasising support for multilingual text
- Cairo a vector-based cross platform graphics library that can render text
[edit] External links
[edit] References
- ^ "The Platform Update for Windows Vista - DirectX Developer Blog - Site Home - MSDN Blogs". Blogs.msdn.com. 2009-09-10. http://blogs.msdn.com/directx/archive/2009/09/10/windows-7-transition-pack-for-windows-vista.aspx. Retrieved 2012-01-27.
- ^ "Platform Update Supplement for Windows Vista and for Windows Server 2008". Support.microsoft.com. 2011-02-08. http://support.microsoft.com/kb/2117917. Retrieved 2012-01-27.
- ^ "An update is available for DirectWrite and XPS issues in Windows Vista SP2 and in Windows Server 2008 SP2". Support.microsoft.com. 2011-08-22. http://support.microsoft.com/kb/2505189. Retrieved 2012-01-27.
- ^ "Download: Windows 7 and Windows Server 2008 R2 Service Pack 1 (KB976932) - Microsoft Download Center - Download Details". Microsoft.com. 2011-03-15. http://www.microsoft.com/downloads/en/details.aspx?FamilyID=c3202ce6-4056-4059-8a1b-3a9b77cdfdda. Retrieved 2012-01-27.
- ^ "Slow performance in applications that use the DirectWrite API on a computer that is running Windows 7 or Windows Server 2008 R2". Support.microsoft.com. 2011-08-13. http://support.microsoft.com/kb/2505438. Retrieved 2012-01-27.
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