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[PR #13102] Add support for line renditions in the DX renderer #29400

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opened 2026-01-31 09:34:39 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:34:39 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/13102

State: closed
Merged: Yes

This PR adds support for the VT line rendition attributes in the DirectX
renderer, which allows for double-width and double-height line
renditions.

Line renditions were first implemented in conhost (with the GDI
renderer) in PR #8664. Supporting them in the DX renderer now is a
small step towards #11595.

The DX implementation is very similar to the GDI one. When a particular
line rendition is requested, we create a transform that is applied to
the render target. And in the case of double-height renditions, we also
initialize some clipping offsets to allow for the fact that we only
render half of a line at a time.

One additional complication exists when drawing the cursor, which
requires a two part process where it first renders to a command list,
and then draw the command list in a second step. We need to temporarily
reset the transform in that first stage otherwise it ends up being
applied twice.

I've manually tested the renderer in conhost by setting the UseDx
registry entry and confirmed that it passes the Vttest double-size
tests as well as several of my own tests. I've also checked that the
renderer can now handle horizontal scrolling, which is a feature we get
for free with the transforms.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/13102 **State:** closed **Merged:** Yes --- This PR adds support for the VT line rendition attributes in the DirectX renderer, which allows for double-width and double-height line renditions. Line renditions were first implemented in conhost (with the GDI renderer) in PR #8664. Supporting them in the DX renderer now is a small step towards #11595. The DX implementation is very similar to the GDI one. When a particular line rendition is requested, we create a transform that is applied to the render target. And in the case of double-height renditions, we also initialize some clipping offsets to allow for the fact that we only render half of a line at a time. One additional complication exists when drawing the cursor, which requires a two part process where it first renders to a command list, and then draw the command list in a second step. We need to temporarily reset the transform in that first stage otherwise it ends up being applied twice. I've manually tested the renderer in conhost by setting the `UseDx` registry entry and confirmed that it passes the _Vttest_ double-size tests as well as several of my own tests. I've also checked that the renderer can now handle horizontal scrolling, which is a feature we get for free with the transforms.
claunia added the pull-request label 2026-01-31 09:34:39 +00:00
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Reference: starred/terminal#29400
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