(PECL cairo >= 0.1.0)
CairoFormat::strideForWidth — Provides an appropiate stride to use
This method provides a stride value that will respect all alignment requirements of the accelerated image-rendering code within cairo.
The appropriate stride to use given the desired format and width, or -1 if either the format is invalid or the width too large.
Example #1 CairoFormat::strideForWidth() example
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以上例程的输出类似于：
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