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In the Impeller backend, we **only** support dithering of _gradients_. In addition, it will be the default (and only option). In the [process of enabling dithering by default](https://github.com/flutter/engine/pull/44705), i.e. ```diff class Paint { - static bool enableDithering = false; + static bool enableDithering = true; } ``` ... we realized with internal Google testing this will now apply dithering on more than just gradients, i.e. images in the Skia backend. Since we won't support dithering of images in the Impeller backend, this PR gives a "hint" on whether the `colorSource` (if one is set) can be dithered by the contrived rules we've created.