以百万像素/秒，返回显卡像素填充率，或-1，如果显卡是未知的填充率。
Returns pixel fill-rate in mega pixels/second, or -1 if fill rate of the device is not known.
在以软件模式呈现时，遇到的最大的性能问题与填充率有关，该值定义为呈现的像素数目。
The biggest performance issue you will encounter when rendering in software mode is related to fill rate, which is defined as the number of pixels that you are rendering.
在以软件模式呈现时，遇到的最大的性能问题与填充率有关，该值定义为呈现的像素数目。
The biggest performance issue you will encounter when rendering in software mode is related to fill rate, which is defined as the number of pixels that you are rendering.
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