Add right-click Copy Image to diagrams

mac/Sources/Byre/BoxDiagram.swift

@@ -1103,6 +1103,7 @@ struct BoxDiagramView: View {
                 store.openSheet(.diagram(layout), fromTask: inTask)
             }
             .help("Open full size")
+            .diagramMenu(layout)
             .frame(maxWidth: .infinity, alignment: .leading)
         case .failure(let error):
             DiagramFailure(source: source, reason: error.reason)
@@ -1166,6 +1167,19 @@ private struct TappableCanvas: View {
             .onTapGesture(coordinateSpace: .local) { p in
                 tap(layout.hit(p))
             }
+            .diagramMenu(layout)
+    }
+}
+
+extension View {
+    func diagramMenu(_ layout: BoxLayout) -> some View {
+        contextMenu {
+            Button("Copy Image") {
+                if let image = diagramCGImage(layout) {
+                    copyToClipboard(platformImage(image))
+                }
+            }
+        }
     }
 }
 

mac/Sources/Byre/Platform.swift

@@ -31,6 +31,16 @@ func copyToClipboard(_ text: String) {
     NSPasteboard.general.setString(text, forType: .string)
 }
 
+@MainActor
+func copyToClipboard(_ image: PlatformImage) {
+    NSPasteboard.general.clearContents()
+    NSPasteboard.general.writeObjects([image])
+}
+
+func platformImage(_ cg: CGImage) -> PlatformImage {
+    NSImage(cgImage: cg, size: NSSize(width: cg.width / 2, height: cg.height / 2))
+}
+
 @MainActor
 func openExternal(_ url: URL) {
     NSWorkspace.shared.open(url)
@@ -96,6 +106,15 @@ func copyToClipboard(_ text: String) {
     UIPasteboard.general.string = text
 }
 
+@MainActor
+func copyToClipboard(_ image: PlatformImage) {
+    UIPasteboard.general.image = image
+}
+
+func platformImage(_ cg: CGImage) -> PlatformImage {
+    UIImage(cgImage: cg, scale: 2, orientation: .up)
+}
+
 @MainActor
 func openExternal(_ url: URL) {
     UIApplication.shared.open(url)

mac/Sources/Byre/Render.swift

@@ -1,6 +1,6 @@
-#if os(macOS)
 import SwiftUI
 
+#if os(macOS)
 @MainActor
 func renderDiagram(html: Bool) -> Int32 {
     FontSize.stored = false
@@ -17,18 +17,7 @@ func renderDiagram(html: Bool) -> Int32 {
         FileHandle.standardOutput.write(Data(diagramHTML(layout).utf8))
         return 0
     }
-    let content = BoxCanvas(layout: layout)
-        .frame(width: layout.size.width, height: layout.size.height)
-        .padding(16)
-        .background(Palette.bg)
-        .environment(\.colorScheme, .light)
-    let renderer = ImageRenderer(content: content)
-    renderer.scale = 2
-    var png: Data?
-    NSAppearance(named: .aqua)!.performAsCurrentDrawingAppearance {
-        png = renderer.cgImage.flatMap { NSBitmapImageRep(cgImage: $0).representation(using: .png, properties: [:]) }
-    }
-    guard let png else {
+    guard let png = diagramCGImage(layout).flatMap({ NSBitmapImageRep(cgImage: $0).representation(using: .png, properties: [:]) }) else {
         FileHandle.standardError.write(Data("diagram didn't render".utf8))
         return 1
     }
@@ -36,3 +25,25 @@ func renderDiagram(html: Bool) -> Int32 {
     return 0
 }
 #endif
+
+@MainActor
+func diagramCGImage(_ layout: BoxLayout) -> CGImage? {
+    let content = BoxCanvas(layout: layout)
+        .frame(width: layout.size.width, height: layout.size.height)
+        .padding(16)
+        .background(Palette.bg)
+        .environment(\.colorScheme, .light)
+    let renderer = ImageRenderer(content: content)
+    renderer.scale = 2
+    var image: CGImage?
+    #if os(macOS)
+    NSAppearance(named: .aqua)!.performAsCurrentDrawingAppearance {
+        image = renderer.cgImage
+    }
+    #else
+    UITraitCollection(userInterfaceStyle: .light).performAsCurrent {
+        image = renderer.cgImage
+    }
+    #endif
+    return image
+}