Graphics: Intel, X11 and Wayland
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Intel Preparing To Restore Frame-Buffer Compression For Tiger Lake - Phoronix
This summer Intel disabled frame-buffer compression for Gen12 Tiger Lake graphics. While FBC helps conserve memory bandwidth and can be beneficial to power-savings, under-run issues and related problems resorted Intel to disabling this common feature for Tiger Lake.
But now the open-source Intel Linux developers are preparing to restore frame-buffer compression for benefiting these latest-generation Intel laptops. Well, at least in part.
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Robert O'Callahan: Debugging With Screenshots In Pernosco
When debugging graphical applications it can be helpful to see what the application had on screen at a given point in time. A while back we added this feature to Pernosco.
This is nontrivial because in most record-and-replay debuggers the state of the display (e.g., the framebuffer) is not explicitly recorded. In rr for example, a typical application displays content by sending data to an X11 server, but the X11 server is not part of the recording.
Pernosco analyzes the data sent to the X11 server and reconstructs the updates to window state. Currently it only works for simple bitmap copies, but that's enough for Firefox, Chrome and many other modern applications, because the more complicated X drawing primitives aren't suitable for those applications and they do their complex drawing internally.
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Paalanen: Developing Wayland Color Management and High Dynamic Range [LWN.net]
Over on the Collabora blog, Pekka Paalanen writes about adding color management and high dynamic range (HDR) support to the Wayland display server protocol.
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Developing Wayland Color Management and High Dynamic Range
Wayland (the protocol and architecture) is still lacking proper consideration for color management. Wayland also lacks support for high dynamic range (HDR) imagery which has been around in movie and broadcasting industry for a while now (e.g. Netflix HDR UI).
While there are well established tools and workflows for how to do color management on X11, even X11 has not gained support for HDR. There were plans for it (Alex Goins, DeepColor Visuals), but as far as I know nothing really materialized from them. Right now, the only way to watch HDR content on a HDR monitor in Linux is to use the DRM KMS API directly, in other words, not use any window system, which means not using any desktop environment. Kodi is one of the very few applications that can do this at all.
This is a story about starting the efforts to fix the situation on Wayland.
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