获取为位图图形上下文。

Get the graphics context for the bitmap.

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类似地，软引用也经常用于 GUI 应用程序中，用于缓存位图图形。

Similarly, soft references are also often used in GUI applications for caching bitmap graphics.

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这使得矢量图形做角色动画非常完美而位图图形作为理想的背景或快速草图。

This makes the vector images perfect for clear-cut drawings as in a character animation while bitmap images are ideal for backgrounds or quick drafts.

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