在屏幕上的CALayers上混合模式？那可能吗？ [英] Blending modes on CALayers on screen? Is that possible?

问题描述

有可能在屏幕上使用混合模式组合另一个CALayer吗？

我现在可以使用drawinrect进行屏幕截图，但是

解决方案

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使用CALayers为您完成简单的合成。如果图层标记为非透明，任何透明或半透明区域将允许来自当前图层后面的内容显示。

在Mac上，Core Image过滤器可以用于通过 compositingFilter ， backgroundFilter 或过滤器向此过程添加效果属性。但是，Core Image在iPhone上不可用。

Is that possible to have a CALayer over another one composed using a blending mode on screen?

I now that it is possible to do that offscreen using drawinrect, but is it possible to see it live on the screen?

thanks for any help.

解决方案

Simple compositing is done for you with CALayers. If the layer is marked as being non-opaque, any transparent or translucent areas will allow content from layers behind the current one to show through.

On the Mac, Core Image filters can be used to add effects to this process via the compositingFilter, backgroundFilter, or filters properties. However, Core Image is not available on the iPhone.

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