forked from firka/flutter
50ee3379790a52e522dd1affc4e01b03939388df
R8 texture format is more widely supported than A8, which we emulate on the vulkan backend with a swizzle. Rather than adding more capability or swizzling checks lets just switch to R8 which is fairly trivial. (I think some desktop gl does not support A8 too, but not sure). Add Capabilities getDefaultAtlasFormat. Set this to R8 in Vulkan an non-ES GL. A8 Elsewhere.
[Impeller] Conditionally use A8 or R8 format glyph atlas based on capabilities. (flutter/engine#50534)
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