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3ab2062614
After implementing it a while ago, our previous interpolation scheme didn't really make sense to me and was causing borders to be rendered incorrectly. We don't really draw backgrounds and borders as part of the same draw call anymore, but it seemed reasonable to have a correct implementation in the shader anyway. This commit uses Porter-Duff compositing (i.e., `over`) to produce a color that is the result of superimposing the border on top of the background. Then, we linearly interpolate towards the background color as we slide out of the border and into the background. |
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