51 строка
1.3 KiB
Markdown
51 строка
1.3 KiB
Markdown
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SkiaSharp provides the same features as the native C++ library through a method of wrapping
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the C++ API with a C API that we P/Invoke into.
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Then C# wraps the C API to provide an API similar to the object oriented binding provided by C++.
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For example, given this C++ API:
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```cpp
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class SK_API SkPaint {
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public:
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bool isAntiAlias() const;
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void setAntiAlias(bool aa);
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};
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```
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This is then wrapped in a C API:
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```cpp
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bool sk_paint_is_antialias(const sk_paint_t* cpaint) {
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return AsPaint(cpaint)->isAntiAlias();
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}
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void sk_paint_set_antialias(sk_paint_t* cpaint, bool aa) {
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AsPaint(cpaint)->setAntiAlias(aa);
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}
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```
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Which is then pulled into the C# project via P/Invoke:
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```csharp
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public extern static bool sk_paint_is_antialias (sk_paint_t t);
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public extern static void sk_paint_set_antialias (sk_paint_t t, bool aa);
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```
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Finally, this is wrapped into a neat C# class:
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```csharp
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public class SKPaint : SKObject
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{
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public bool IsAntialias {
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get { return SkiaApi.sk_paint_is_antialias (Handle); }
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set { SkiaApi.sk_paint_set_antialias (Handle, value); }
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}
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}
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```
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As a result, the C# API functions and appears the same as the C++ API.
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Since the C API is currently a work in progress of the Skia project, we
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maintain a fork in github.com/mono/skia that has our additions. We intend
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to upstream those changes to Google.
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