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18.
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Ren'Py attempts to predict the images that will be used in the future, and loads them into the image cache before they are used. When space in the cache is needed for other images, Ren'Py will remove images that are no longer being used.
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Ren'Py会尝试预测图像是否会在将来被使用，并在使用前将其载入到缓存中。当缓存中的空间需要用来存储其他图像时，Ren'Py会将那些不再使用的图像移除。
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Translated and reviewed by
Hanming Wu
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Located in
../../source/displayables.rst:67
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19.
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By default, Ren'Py will predictively cache up to 8 screens worth of image data. (If your screen is 800x600, then a screen's worth of data is one 800x600 image, two 400x600 images, and so on.) This can be changed with the :var:config.image_cache_size configuration variable.
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Ren'Py默认情况下会预先载入相当于8个屏幕大小的图像数据。(如果您的显示尺寸为800x600，那么一个屏幕大小的数据就是一个800x600的图像，或者2个400x600的图像，以此类推) 这个数字可以通过:var:config.image_cache_size变量来设置。
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Translated and reviewed by
Hanming Wu
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Located in
../../source/displayables.rst:72
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20.
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Although the precise amount is dependent on implementation details and there is significant overhead, as a rule of thumb, each pixel in the image cache consumes 4 bytes of main memory and 4 bytes of video memory.
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图像在缓存中所占用的空间的精确大小依赖于具体的实现细节，这明显超出了这篇文档的讨论范围，根据经验来讲，图像的每一个像素占用4字节的物理内存和4字节的显存。
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Translated and reviewed by
Hanming Wu
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Located in
../../source/displayables.rst:78
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21.
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Image-Like Displayables
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类图像的Displayables
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Translated and reviewed by
Hanming Wu
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Located in
../../source/displayables.rst:84
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22.
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We call these displayables image-like because they take up a rectangular area of the screen, and do not react to input. These differ from normal images by varying their size to fill an area (Frame, LiveTile, and Solid), or by allowing the user to specify their size (LiveComposite, LiveCrop, Null). They are not image manipulators.
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我们把这类displayable成为类图像的是因为他们在屏幕上占据了一个矩形的区域，并且不会对输入做出响应。和普通的图像不同之处在于这种displayable会改变自身大小来填充一个区域(Frame、LiveTile或Solid)，或者允许用户来指定他们的大小 (LiveComposite、LiveCrop、Null)。他们不能操作图像。
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Translated and reviewed by
Hanming Wu
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Located in
../../source/displayables.rst:86
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23.
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Image-like displayables take :ref:`position-style-properties`.
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类图像displayables使用:ref:`position-style-properties`。
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Translated and reviewed by
Huang Junjie
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Located in
../../source/displayables.rst:92
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24.
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This flattens `child`, which may be made up of multiple textures, into a single texture.
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平铺由多个纹理构成的`child`成单个纹理。
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Translated and reviewed by
Huang Junjie
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Located in
../../source/inc/disp_imagelike:5
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25.
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Certain operations, like the alpha transform property, apply to every texture making up a displayable, which can yield incorrect results when the textures overlap on screen. Flatten creates a single texture from multiple textures, which can prevent this problem.
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比如Alpha变换处理这样的操作应用于构成displayable的所有纹理，可能会在纹理重叠于屏幕上时发生错误。此操作会将多个纹理转换成单个纹理，避免错误。
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Translated and reviewed by
Huang Junjie
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Located in
../../source/inc/disp_imagelike:8
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26.
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Flatten is a relatively expensive operation, and so should only be used when absolutely required.
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平铺是一个相对消耗资源的操作，仅在有必要时使用。
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Translated and reviewed by
Huang Junjie
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Located in
../../source/inc/disp_imagelike:13
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27.
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A displayable that resizes an image to fill the available area, while preserving the width and height of its borders. is often used as the background of a window or button.
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保持边缘宽高比并将图像填充至可用区域的displayable。它经常使用在窗口背景或按钮上。
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Translated and reviewed by
Huang Junjie
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Located in
../../source/inc/disp_imagelike:18
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