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bug: 修改svga图片缩放模式 #449
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bug: 修改svga图片缩放模式 #449
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原因：svga 是由多张图片构成，图片有大有小。外界传递进来的宽高当前View 使用的期望宽高，将svga 中的所有图片根据同一个宽高去进行采样率计算明显不合理。比如 一张svga 包含三张图片假设三张图都是正方向 他们的宽度分别是800、400、200 期望大小是200 那么计算出的采样率分别是 4、2、1 那么在进行图片获取的时候会将三张图片最终加载成同样大小。
解决方式：读取svga 最外层的实际大小，以此作为基础与期望的图片大小进行采样率计算。然后svga内部的所有图片按照这个采样率进行采样