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Skia Graphics Library - 版本历史
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<p><b>新页面</b></p><div>{{NoteTA|G1=IT|G2=FL}}<br />
{{Infobox software<br />
| name = Skia Graphics Engine<br />
| title = Skia Graphics Engine<br />
| logo = <!-- [[File: ]] --><br />
| screenshot = <!-- [[File: ]] --><br />
| caption = <br />
| collapsible = <br />
| author = Skia公司<br />
| developer = [[Google]]<br />
| released = <!-- {{Start date|YYYY|MM|DD|df=yes/no}} --><br />
| discontinued = <br />
| latest release version = <br />
| latest release date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} --><br />
| latest preview version = <br />
| latest preview date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} --><br />
| programming language = [[C++]]<br />
| operating system = <br />
| platform = <br />
| size = <br />
| language = <br />
| genre = [[圖形庫]]<br />
| license = [[BSD授權條款|New BSD License]]<br />
| website = {{URL|https://skia.org}}<br />
}}<br />
<br />
{{Portal|Free software}}<br />
<br />
'''Skia Graphics Library'''（SGL）是一個由[[C++]]編寫的[[開放原始碼]][[圖形庫]]，最初由Skia公司開發，被[[Google]]收購後以[[BSD授權條款|New BSD License]]許可下開源。<br />
<br />
Skia公司所開發的第一個產品就是Skia Graphics Library，能在低端裝置如手機上呈現高品質的2D圖形。{{as of | 2017}}，它已被應用於[[Android]]、[[Google Chrome]]、[[Chrome OS]]、[[Chromium OS]]、[[Mozilla Firefox]]、[[Firefox OS]]以及[[Sublime Text]]。<br />
<br />
2012年时Skia有大概80,000行程式碼，以C++開發而成<ref>{{Cite web |url=http://www.linuxgraphics.cn/android/skia.html |title=android 的图形引擎 skia |accessdate=2011-07-05 |archive-date=2012-08-04 |archive-url=https://archive.today/20120804043224/http://www.linuxgraphics.cn/android/skia.html |dead-url=no }}</ref>。<br />
<br />
==範例==<br />
Skia主要的類別是SkCanvas，所有的繪圖功能都是實作於此類別。以下是SGL簡單的程式碼：<br />
<br />
SkCanvas* can = GraphicsJNI::getNativeCanvas(...); <br />
SkPaint paint; <br />
paint.setARGB(255, 0, 0, 255);<br />
can->drawText("Hello, world", 12, 10, 10, paint);<br />
<br />
==“绿化”缺陷==<br />
为了提高运行的效率，Google在Android的Skia实现中，对JPG压缩处理算法改写来代替调用libjpeg-turbo，实现了一个低精度的[[YUV]]转换为[[RGB]]的算法，但该改写算法中除法取整的方式不合理，不仅每次压缩后画质劣化更严重，随着误差逐步累积，还会导致图片会越来越偏向绿色。最终该缺陷在2016年4月得到修复，修改回直接使用libjpeg-turbo的调用。<ref>{{cite web|title=Use libjpeg-turbo for YUV->RGB conversion in jpeg encoder · google/skia@c7d01d3|url=https://github.com/google/skia/commit/c7d01d3e1d3621907c27b283fb7f8b6e177c629d|website=GitHub|accessdate=2017-03-13|language=en|archive-date=2019-02-17|archive-url=https://web.archive.org/web/20190217223939/https://github.com/google/skia/commit/c7d01d3e1d3621907c27b283fb7f8b6e177c629d|dead-url=no}}</ref>而作为Android基础库的一部分，该修复也被认为预计于[[Android 7]]中修复。<br />
<br />
==参见==<br />
{{Portal|自由软件}}<br />
* [[Cairo (繪圖)|cairo]]<br />
* [[Direct2D]]<br />
* [[OpenVG]]<br />
* {{tsl|en|Starling Framework}}<br />
* {{tsl|en|Anti-Grain Geometry}}<br />
<br />
==参考资料==<br />
{{reflist}}<br />
<br />
==外部链接==<br />
* {{Official website|https://skia.org/}}<br />
* {{youtube|OmfliNQsk88|Skia Path Ops : High Performance Set Operations for Geometry}}<br />
* http://www.slideshare.net/snailee/skia-freetype-android-2d-graphics-essentials{{Wayback|url=http://www.slideshare.net/snailee/skia-freetype-android-2d-graphics-essentials |date=20170125184422 }}<br />
<br />
[[Category:繪圖函式庫]]<br />
[[Category:使用BSD许可证的软件]]<br />
[[Category:Google]]</div>
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