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    <p>Many GDI functions are accelerated by the graphics hardware, and some GDI+ routines may use GDI underneath. But most of GDI+ is independant of GDI.</p> <p>An important, and telling, example is text rendering. In GDI+ text rendering is done completely in software; the anti-aliasing, glyph pixel-fitting and other effects is done without the video card.</p> <p><a href="http://i.msdn.microsoft.com/ms533818.fontstext10(en-us,VS.85).png" rel="noreferrer">alt text http://i.msdn.microsoft.com/ms533818.fontstext10(en-us,VS.85).png</a></p> <p>Microsoft's Chris Jackson had an interesting blog post where he profiled the <a href="http://blogs.msdn.com/cjacks/archive/2006/05/19/gdi-vs-gdi-text-rendering-performance.aspx" rel="noreferrer">speed difference between text rendering in GDI and GDI+</a>:</p> <blockquote> <p>...my GDI code path was rendering approximately 99,000 glyphs per second, while my GDI+ code path was rendering approximately 16,000 glyphs per second.</p> </blockquote> <p>Another example is line drawing. GDI+ supports anti-aliased line/polygon and circle/ellipse drawing, while GDI does not:</p> <p><a href="http://i.msdn.microsoft.com/ms536351.aboutgdip02_art33(en-us,VS.85).png" rel="noreferrer">alt text http://i.msdn.microsoft.com/ms536351.aboutgdip02_art33(en-us,VS.85).png</a><a href="http://i.msdn.microsoft.com/ms536351.aboutgdip02_art34(en-us,VS.85).png" rel="noreferrer">alt text http://i.msdn.microsoft.com/ms536351.aboutgdip02_art34(en-us,VS.85).png</a></p> <p><a href="http://i.msdn.microsoft.com/ms536351.aboutgdip02_art36(en-us,VS.85).png" rel="noreferrer">alt text http://i.msdn.microsoft.com/ms536351.aboutgdip02_art36(en-us,VS.85).png</a></p>
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    1. POIs GDI+ just a layer on top of GDI, or something new?
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    1. USIan Boyd
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    1. POIs GDI+ just a layer on top of GDI, or something new?
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    1. COBut to answer your question more directly: GDI+ is completely new. This actually becomes a problem since it's slower than GDI (i.e. not hardware accelerated), and the text rendering is different than GDI (leading to text that can look different in different parts of a .NET application). It's not a COM wrapper around GDI, in fact it's not even COM. It's flat C api. Microsoft created a set of C++ classes that simplify call the flat functions. `System.Drawing` in .NET is a set of classes that also call the flat functions.
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