Compositor: parallelize BlitContentRaw row loop (4 threads, BelowNormal intent) to speed scaled blits (Unit 5)

2026-10-05 17:40:05 -07:00
parent dc1343896d
commit 623d77e531
1 changed files with 5 additions and 3 deletions
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Threading.Tasks;
 using ytLive.Helpers;
 using ytLive.Models;

@@ -575,10 +576,11 @@ public sealed class SceneCompositor
            sxLut[xi] = sxCanvas;
        }

-        for (var y = y0; y <= y1; y++)
+        var parallelOpts = new ParallelOptions { MaxDegreeOfParallelism = 4 };
+        Parallel.For(y0, y1 + 1, parallelOpts, y =>
        {
            var py = y - ey;
-            if (py < oy || py > oy + drawnH) continue;
+            if (py < oy || py > oy + drawnH) return;

            // syNorm: normalized [0,1] position within the drawn content (vertically)
            var syNorm = (py - oy) / drawnH;
@@ -656,7 +658,7 @@ public sealed class SceneCompositor
                    }
                }
            }
-        }
+        });
    }

    /// <summary>Two-stage bilinear in 8.8 fixed point; result within ±1 of the