问题描述
我正在尝试从WPF BitmapSource 对象获取像素数据。据我了解，这可以通过调用 CopyPixels 方法来实现。这个方法需要一个stride参数，我不知道如何获取。据我所知，stride是在读取或复制期间踩入数组时使用的值。任何BitmapSource的适当步幅值是什么？
I'm trying to get the pixel data from a WPF BitmapSource object. As I understand, this can be accomplished by calling its CopyPixels method. This method needs a stride parameter, which I don't know how to obtain. As far as I know, stride is value that's used when stepping in the array during reading or copying. What would be an appropriate stride value for any BitmapSource?
推荐答案
您可以使用stride = pixel_size * image_width值。例如，对于100像素宽度的RGBA位图，stride = 400。
You can use stride = pixel_size * image_width value. For example, for RGBA bitmap with 100 pixel width, stride = 400.
某些应用程序可能需要特殊的行对齐。例如，Windows GDI位图需要32位行对齐。在这种情况下，对于宽度= 33的RGB位图，应将步幅值33 * 3 = 99更改为100，以在目标数组中进行32位行对齐。
Some applications may require special line alignment. For example, Windows GDI bitmaps require 32-bits line alignment. In this case, for RGB bitmap with width = 33, stride value 33*3=99 should be changed to 100, to have 32-bits line alignment in destination array.
通常，您应该了解目标阵列要求。在没有特殊要求的情况下，使用默认的pixel_size * image_width。
Generally, you should know destination array requirements. In there are no special requirements, use default pixel_size * image_width.
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