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Compositor: prefill only uncovered rows when backdrop not fully covered (Unit 4)

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gramps
2026-10-05 16:13:39 -07:00
parent bdea18e12c
commit 08290ece16
1 changed files with 47 additions and 2 deletions
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Services/Compositor/SceneCompositor.cs
+47 -2
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@@ -92,8 +92,53 @@ public sealed class SceneCompositor
var covered = liveCaptureFrame != null
&& liveCaptureFrame.Width == cropW && liveCaptureFrame.Height == cropH;
if (!covered)
for (var i = 3; i < buffer.Length; i += 4)
buffer[i] = 255; // opaque black base
{
if (liveCaptureFrame != null)
{
var (uScale, uOx, uOy) = StretchMath.UniformToFill(cropW, cropH, liveCaptureFrame.Width, liveCaptureFrame.Height);
var drawnW = liveCaptureFrame.Width * uScale;
var drawnH = liveCaptureFrame.Height * uScale;
var ox = (int)Math.Floor(uOx);
var oy = (int)Math.Floor(uOy);
var oh = (int)Math.Ceiling(oy + drawnH);
var ow = cropW;
if (oy > 0)
{
var topCount = oy * ow;
for (var i = 3; i < topCount * 4; i += 4)
buffer[i] = 255;
}
if (oh < cropH)
{
var start = oh * ow;
var bottomCount = (cropH - oh) * ow;
for (var i = start * 4 + 3; i < (start + bottomCount) * 4; i += 4)
buffer[i] = 255;
}
if (ox > 0 || (int)Math.Ceiling(uOx + drawnW) < cropW)
{
var x0s = (int)Math.Floor(uOx);
var x1s = (int)Math.Ceiling(uOx + drawnW);
for (var y = oy; y < oh && y < cropH; y++)
{
var di = (y * ow + 0) * 4;
for (var x = 0; x < x0s && x < ow; x++)
{
buffer[di + x * 4 + 3] = 255;
}
for (var x = x1s; x < ow; x++)
{
buffer[di + x * 4 + 3] = 255;
}
}
}
}
else
{
for (var i = 3; i < buffer.Length; i += 4)
buffer[i] = 255; // opaque black base
}
}
if (liveCaptureFrame != null)
BlitContent(buffer, cropW, cropH, 0, 0, cropW, cropH, liveCaptureFrame, 1f, false, false);