Bug 627771 implemented SWGL fast-path dithering for linear and radial gradients. But it could not be used from WebRender.
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Bug 627771 implemented SWGL fast-path dithering for linear and radial gradients. But it could not be used from WebRender. With Attachment 9499116 [details] of Bug 1976163, the banding still exists with software WebRender.