gramps
41b0cd6e98
ScoreboardTiles decides which of the eight facts appear and shapes their text (money uses the
session's dominant currency and flags a second one rather than converting; watch hours carry
'as of {date}' because Analytics is a daily aggregate). Tiles are OPT-IN, so 'None' really means the
layer draws nothing, and 'Default' is the six session facts.
ScoreboardPresenter owns the raster cache: ScoreboardRecorder.Changed fires only on a visible change,
so the strip rebuilds only then — a per-tick raster would be the compositor's most expensive layer
for identical pixels.
Guard: ScoreboardPresenterTests asserts the cache identity (same instance when nothing moved, a new
frame when a value moved, reuse when a recipient-side gift event arrives) and that an empty selection
returns no frame at all.
61 lines
1.9 KiB
C#
61 lines
1.9 KiB
C#
using System.Collections.Generic;
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using ytLive.Models;
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namespace ytLive.Services.Compositor;
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/// <summary>Turns the session's tallies into the strip frame, and keeps the raster until a displayed
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/// value actually moves.
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///
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/// <para>The cache is the point: a strip re-rasterised every tick would be the most expensive layer
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/// the compositor carries, for pixels that did not change. `ScoreboardRecorder.Changed` only fires
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/// on a visible change, so the presenter rebuilds only then.</para></summary>
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public sealed class ScoreboardPresenter
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{
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private readonly ScoreboardRecorder _recorder;
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private VideoFrame? _frame;
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private string? _tilesFingerprint;
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private ScoreboardStyle _style;
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private ScoreboardTiles _tiles = ScoreboardTiles.None;
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public ScoreboardPresenter(ScoreboardRecorder recorder, ScoreboardStyle style)
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{
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_recorder = recorder;
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_style = style;
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_recorder.Changed += Invalidate;
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}
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/// <summary>The strip frame for the current tallies, or null when nothing is enabled/shown.</summary>
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public VideoFrame? Frame
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{
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get
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{
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var tiles = _tiles.Build(_recorder.State);
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var fingerprint = $"{_tiles.CacheKey}|{string.Join('|', tiles)}|{_style}";
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if (_frame != null && fingerprint == _tilesFingerprint) return _frame;
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_tilesFingerprint = fingerprint;
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_frame = ScoreboardRenderer.Render(tiles, _style);
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return _frame;
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}
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}
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public void SetTiles(ScoreboardTiles tiles)
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{
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_tiles = tiles;
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Invalidate();
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}
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public void SetStyle(ScoreboardStyle style)
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{
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_style = style;
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Invalidate();
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}
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/// <summary>Drops the cached raster so the next read rebuilds it.</summary>
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public void Invalidate()
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{
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_frame = null;
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_tilesFingerprint = null;
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}
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}
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