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Compositor: parallelize BlitBakedElement and BlitOverlay row loops; cap at 4 threads (Unit 5)

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gramps
2026-10-05 17:44:03 -07:00
parent 623d77e531
commit 3901cb8298
1 changed files with 8 additions and 7 deletions
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Services/Compositor/SceneCompositor.cs
+8 -7
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@@ -396,17 +396,17 @@ public sealed class SceneCompositor
var x1 = System.Math.Min(cropW, px + dw);
var y1 = System.Math.Min(cropH, py + dh);
if (x0 >= x1 || y0 >= y1) return;
var d = buffer.AsSpan();
var s = raster.BgraPixels;
for (var y = y0; y < y1; y++)
var parallelOpts = new ParallelOptions { MaxDegreeOfParallelism = 4 };
Parallel.For(y0, y1, parallelOpts, y =>
{
var si = ((y - py) * dw + (x0 - px)) * 4;
var len = x1 - x0;
if (op == 256)
BlendRowOpaque(d, (y * cropW + x0) * 4, s.AsSpan(si, len * 4), 0, len);
BlendRowOpaque(buffer, (y * cropW + x0) * 4, s, si, len);
else
BlendRowWeighted(d, (y * cropW + x0) * 4, s.AsSpan(si, len * 4), 0, len, op);
}
BlendRowWeighted(buffer, (y * cropW + x0) * 4, s, si, len, op);
});
}
/// <summary>Copy <paramref name="frame"/> and blit a global overlay onto the copy
@@ -823,12 +823,13 @@ public sealed class SceneCompositor
var dy0 = Math.Max(0, sy0 - options.SourceRectY);
var dx1 = Math.Min(dstW, sx0 - options.SourceRectX + overlay.Width);
var dy1 = Math.Min(dstH, sy0 - options.SourceRectY + overlay.Height);
for (var y = dy0; y < dy1; y++)
var parallelOpts = new ParallelOptions { MaxDegreeOfParallelism = 4 };
Parallel.For(dy0, dy1, parallelOpts, y =>
{
var si = ((y + options.SourceRectY - sy0) * overlay.Width
+ dx0 + options.SourceRectX - sx0) * 4;
BlendRowOpaque(dst, (y * dstW + dx0) * 4, overlay.BgraPixels, si, dx1 - dx0);
}
});
}
/// <summary>Straight-alpha source-over blend; the frame's alpha (and the layer opacity) drives coverage.</summary>