feat(style-engine): add DrawListExtensions primitives
Custom-drawing primitives consumed by upcoming components: DrawHoverSheen with sweep tracking via a static dictionary scoped to constant element-id keys, DrawGlowBorder using squared-fade layer rects, DrawSlipPolygon as unsafe stackalloc six-point chamfered polygon, and DrawHonorificHeader for the crown plus bracketed title. BuildSlipPolygon is internal so the build suite can pin the geometry without spinning up an ImGui frame.
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using System.Numerics;
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using Dalamud.Bindings.ImGui;
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using Dalamud.Interface;
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using Dalamud.Interface.ManagedFontAtlas;
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using HellionChat.Themes;
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using HellionChat.Util;
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namespace HellionChat.Ui.StyleEngine;
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// Custom-drawing primitives for the v2.x style layer. Callers feed RGBA
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// uints (typically resolved via TokenResolver) and these methods convert to
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// ABGR before delegating to ImDrawList. Hover-sheen state lives in a small
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// static dictionary keyed by constant strings — keep keys constant and
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// scope to static UI elements so the per-key footprint stays bounded.
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internal static class DrawListExtensions
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{
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private const float SheenDurationSeconds = 0.65f;
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private static readonly Dictionary<string, DateTime> SheenStarts = new();
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public static void DrawHoverSheen(
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this ImDrawListPtr dl,
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Vector2 min,
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Vector2 max,
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uint accentRgba,
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string elementId,
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bool hovered
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)
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{
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if (!hovered)
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{
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// Reset so re-hover restarts the sweep instead of catching the
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// tail end of a stale animation.
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SheenStarts.Remove(elementId);
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return;
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}
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if (!SheenStarts.TryGetValue(elementId, out var started))
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{
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started = DateTime.UtcNow;
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SheenStarts[elementId] = started;
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}
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var elapsed = (DateTime.UtcNow - started).TotalSeconds;
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if (elapsed > SheenDurationSeconds)
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return;
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var t = (float)(elapsed / SheenDurationSeconds);
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var alpha = (byte)Math.Round(0x40 * (1f - t));
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var sheenAbgr = ((uint)alpha << 24) | 0x00FFFFFFu;
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var sweepX = min.X + (max.X - min.X) * t;
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dl.AddRectFilled(
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new Vector2(sweepX - 12f, min.Y),
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new Vector2(sweepX + 12f, max.Y),
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sheenAbgr,
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2f
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);
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// Accent currently unused — reserved for a tinted-sweep variant that
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// tracks the element's accent hue. Keeping it in the signature so
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// call-sites don't churn when the tinted path lands.
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_ = accentRgba;
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}
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public static void DrawGlowBorder(
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this ImDrawListPtr dl,
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Vector2 min,
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Vector2 max,
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uint colorRgba,
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float thickness = 1f,
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int layers = 5
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)
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{
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var r = (byte)((colorRgba >> 24) & 0xFFu);
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var g = (byte)((colorRgba >> 16) & 0xFFu);
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var b = (byte)((colorRgba >> 8) & 0xFFu);
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var a = (byte)(colorRgba & 0xFFu);
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for (var i = 0; i < layers; i++)
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{
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var fade = 1f - (i / (float)layers);
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// Squared fade so outer layers vanish faster than a linear taper
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// would suggest — keeps the glow halo from looking like a band.
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var layerAlpha = (byte)Math.Round(a * fade * fade);
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var layerAbgr = ((uint)layerAlpha << 24) | ((uint)b << 16) | ((uint)g << 8) | r;
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var offset = i + 1;
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dl.AddRect(
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new Vector2(min.X - offset, min.Y - offset),
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new Vector2(max.X + offset, max.Y + offset),
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layerAbgr,
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3f,
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ImDrawFlags.None,
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thickness
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);
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}
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}
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public static unsafe void DrawSlipPolygon(
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this ImDrawListPtr dl,
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Vector2 min,
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Vector2 max,
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uint colorRgba,
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float chamfer
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)
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{
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Span<Vector2> pts = stackalloc Vector2[6];
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BuildSlipPolygon(min, max, chamfer, pts);
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var abgr = ColourUtil.RgbaToAbgr(colorRgba);
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fixed (Vector2* p = pts)
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dl.AddConvexPolyFilled(p, 6, abgr);
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}
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// Geometry-only helper (no ImGui, no allocation) so the build suite can
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// pin the slip-card shape without standing up an ImGui frame.
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internal static void BuildSlipPolygon(
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Vector2 min,
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Vector2 max,
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float chamfer,
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Span<Vector2> pts
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)
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{
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var bound = Math.Min(max.X - min.X, max.Y - min.Y) * 0.5f;
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var c = Math.Max(0f, Math.Min(chamfer, bound));
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// Clockwise wrap; bottom-left corner replaced by a 45-degree cut.
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pts[0] = new Vector2(min.X + c, min.Y);
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pts[1] = new Vector2(max.X, min.Y);
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pts[2] = new Vector2(max.X, max.Y);
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pts[3] = new Vector2(min.X + c, max.Y);
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pts[4] = new Vector2(min.X, max.Y - c);
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pts[5] = new Vector2(min.X, min.Y + c);
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}
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public static void DrawHonorificHeader(
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this ImDrawListPtr dl,
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Vector2 origin,
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string title,
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Theme theme,
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IFontHandle fontAwesomeFont,
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float gap = 4f
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)
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{
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var crownAbgr = ColourUtil.RgbaToAbgr(theme.Colors.Identity);
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var titleAbgr = ColourUtil.RgbaToAbgr(theme.Colors.TextPrimary);
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var crownGlyph = FontAwesomeIcon.Crown.ToIconString();
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// FontAwesome must wrap the crown specifically — the bracketed title
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// renders in the regular text font, so the push has to be tight.
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float crownWidth;
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using (fontAwesomeFont.Push())
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{
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crownWidth = ImGui.CalcTextSize(crownGlyph).X;
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dl.AddText(origin, crownAbgr, crownGlyph);
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}
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dl.AddText(origin + new Vector2(crownWidth + gap, 0f), titleAbgr, $"«{title}»");
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}
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}
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