The frame collapsed Hyprland's border gradient to m_colors.front(), so a
gradient col.active_border showed up as a single flat color.
Snapshot the gradient (stops + angle) into a new header-only ChromeGradient
and fill the cairo path with a linear gradient built from it:
- AxisFor() reproduces the border shader's quadrant-folding progress
function (y*sin(a) + x*(1-sin(a)), not a true rotation) as a cairo axis,
so the frame's sweep stays in step with the window border it wraps.
Checked against a port of the shader across all 360 degrees: cardinal
angles exact, worst case 0.003 of the sweep (the shader folds on literal
1.57/3.14/4.71 where this uses pi).
- SampleAt() interpolates in OkLab, where the shader interpolates, with
each segment subdivided into sampled cairo stops so cairo's own sRGB lerp
tracks that curve.
active_color/inactive_color become gradient config values, taking the same
syntax as general:col.active_border. Single-color configs are unaffected.
The cross-focus fade (m_realBorderColorPrevious + fade progress, lerped
between two gradients in-shader) is still not reproduced.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
darmanandClaude Opus 5