What are the correct settings to render into a _SRgb render target with linear device color space?

[tonfilm]

Hello,

we currently use the ANGLE DX11 backend with linear device color space. We use SkiaSharp to directly render into the final render target by creating a SkSurface from the render target.

However, we have subtle differences in rendering colors and especially glyph edges compared to gamma device color space.

This is the surface setup, the render target format is R8G8B8A8_UNorm_SRgb:

https://github.com/vvvv/VL.Stride/blob/preview/gamma-2021.4/packages/VL.Stride.Windows/src/SkiaRenderer.cs#L86

here are the subtleties mentioned in rendering:
https://discourse.vvvv.org/t/colors-are-not-displayed-correctly-when-using-the-angle-version-of-skiarenderer-and-font-rendering-is-worse/19773

What is the correct setting to get correct font rendering when the DirectX device is set to linear color space?

Thanks!

[tonfilm]

Bump. So how do we set up Skia correctly that the alpha values (such as glyph edges) work properly with a linear pipeline setup?

Thanks!

[Brian Osman]

We just recently added a new SkColorType that corresponds to a HW _SRGB format: https://skia.googlesource.com/skia/+/refs/heads/main/include/core/SkImageInfo.h#94

That probably doesn't exist in SkiaSharp yet, but when it does, I think the correct SkSurface configuration to get linear blending would be to use that color type, and a linear color space (eg, SkColorSpace::MakeSRGBLinear).

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[tonfilm]

Thanks, we made an issue there and will try to start a pull request:

https://github.com/mono/SkiaSharp/issues/1809