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Fix supersample blur and click-cancellation on micro-drags

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The 3x supersample resized the whole capture (blurring content); only the
corner mask is supersampled now, applied through clip(to😷) with the
image drawn once at native scale. The tap's drag branch also clears the
hovered window on sub-4px jitter, cancelling click-to-capture; the
threshold is applied there too.

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4-flash-0731
This commit is contained in:
TZGyn
2026-09-09 15:26:19 +08:00
parent 07642ca408
commit 715bb28c1b
2 changed files with 33 additions and 15 deletions
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Sources/Kapture/CaptureController.swift
+31 -13
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@@ -301,8 +301,11 @@ final class CaptureController: NSObject {
}
return event
}
// Drag: grow the marquee
// Drag: grow the marquee — but only after real movement, so a
// click's micro-jitter keeps the hovered window eligible.
guard let start = marqueeStart else { return nil }
let distance = hypot(appKitPoint.x - start.x, appKitPoint.y - start.y)
guard distance >= 4 else { return nil }
let rect = NSRect(
x: min(start.x, appKitPoint.x),
y: min(start.y, appKitPoint.y),
@@ -443,28 +446,43 @@ final class ScreenCapture {
let detected = Self.detectCornerRadius(of: result)
let radius = min(max((detected.map { $0 * 1.23 + 2.6 }) ?? (10 * scaleX), 4), 40)
CaptureController.log("corners: detected=\(detected.map { String(format: "%.1f", $0) } ?? "nil") using=\(Int(radius))px")
// Anti-aliased gray mask: supersample 3x, downsample, then draw
// the image through it ONCE at 1x (no content resampling blur).
let ss = 3
let W = result.width * ss, H = result.height * ss
guard let hiCtx = CGContext(
guard let hiMask = CGContext(
data: nil, width: W, height: H,
bitsPerComponent: 8, bytesPerRow: 0,
space: CGColorSpaceCreateDeviceRGB(),
bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue
space: CGColorSpaceCreateDeviceGray(),
bitmapInfo: CGImageAlphaInfo.none.rawValue
) else { return result }
hiCtx.addPath(CGPath(roundedRect: CGRect(x: 0, y: 0, width: W, height: H), cornerWidth: radius * CGFloat(ss), cornerHeight: radius * CGFloat(ss), transform: nil))
hiCtx.clip()
hiCtx.interpolationQuality = .high
hiCtx.draw(result, in: CGRect(x: 0, y: 0, width: W, height: H))
guard let hi = hiCtx.makeImage(),
let downCtx = CGContext(
hiMask.setFillColor(CGColor(gray: 1, alpha: 1))
hiMask.fill(CGRect(x: 0, y: 0, width: W, height: H))
hiMask.setFillColor(CGColor(gray: 0, alpha: 1))
let cornerPath = CGMutablePath()
cornerPath.addRect(CGRect(x: 0, y: 0, width: W, height: H))
cornerPath.addRoundedRect(in: CGRect(x: 0, y: 0, width: W, height: H), cornerWidth: radius * CGFloat(ss), cornerHeight: radius * CGFloat(ss), transform: .identity)
hiMask.addPath(cornerPath)
hiMask.fillPath(using: .evenOdd)
guard let hiMaskImg = hiMask.makeImage(),
let downMask = CGContext(
data: nil, width: result.width, height: result.height,
bitsPerComponent: 8, bytesPerRow: 0,
space: CGColorSpaceCreateDeviceGray(),
bitmapInfo: CGImageAlphaInfo.none.rawValue
) else { return result }
downMask.interpolationQuality = .high
downMask.draw(hiMaskImg, in: CGRect(x: 0, y: 0, width: result.width, height: result.height))
guard let mask1x = downMask.makeImage(),
let ctx = CGContext(
data: nil, width: result.width, height: result.height,
bitsPerComponent: 8, bytesPerRow: 0,
space: CGColorSpaceCreateDeviceRGB(),
bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue
) else { return result }
downCtx.interpolationQuality = .high
downCtx.draw(hi, in: CGRect(x: 0, y: 0, width: result.width, height: result.height))
if let masked = downCtx.makeImage() {
ctx.clip(to: CGRect(x: 0, y: 0, width: result.width, height: result.height), mask: mask1x)
ctx.draw(result, in: CGRect(x: 0, y: 0, width: result.width, height: result.height))
if let masked = ctx.makeImage() {
result = masked
}
}