OmaPhoto 1.0.0: the Linux port of Compositor

A layered image editor for Linux and Omarchy, ported from Compositor
(github.com/robbietilton/Compositor), whose Swift source is its
specification. It reads and writes Compositor's .comp projects.

Packages for Ubuntu, Fedora and Arch come from the release workflow;
scripts/install/ holds one install script per distribution family,
and flake.nix serves NixOS.

Co-Authored-By: Claude <noreply@anthropic.com>

src/Document/MagicWand.h

@@ -0,0 +1,40 @@
+#pragma once
+#include <QImage>
+#include <QPainterPath>
+#include <QPointF>
+#include <QString>
+#include <optional>
+#include <stdexcept>
+#include <vector>
+
+// Pixels either side of the click, averaged into the reference.
+enum class WandSampleSize { point, threeByThree, fiveByFive };
+QString title(WandSampleSize size);
+int radius(WandSampleSize size);
+
+// The Magic Wand's options-bar settings.
+struct WandSettings {
+    // How far each channel may differ, 0–255, and still match.
+    int tolerance = 32;
+    WandSampleSize sampleSize = WandSampleSize::point;
+    // Only similar pixels connected to the clicked one.
+    bool contiguous = true;
+    // The visible composite rather than the active layer.
+    bool sampleAllLayers = false;
+    friend bool operator==(const WandSettings &, const WandSettings &) = default;
+};
+
+class MagicWandError : public std::runtime_error {
+public:
+    enum class Kind { tooDetailed, memory };
+    explicit MagicWandError(Kind kind);
+    const Kind kind;
+};
+
+// Selects pixels like a clicked one; the C kernel matches.
+namespace MagicWand {
+// The outline of pixels matching the click; nil when none.
+std::optional<QPainterPath> select(const QImage &image, QPointF point, const WandSettings &settings);
+// The outline of a mask's nonzero pixels along their edges.
+std::optional<QPainterPath> outline(const std::vector<uchar> &mask, int width, int height);
+}