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/Crop.h

@@ -0,0 +1,36 @@
+#pragma once
+#include "Document/LayerTransform.h"
+#include <QRectF>
+#include <optional>
+#include <vector>
+
+// Swift's CropGeometry: frames on whole pixels, within Swift's bounds.
+namespace CropGeometry {
+QRectF snapped(const QRectF &rect);
+bool valid(const QRectF &rect);
+// From `start` to `end`, or out from `start` when symmetric.
+QRectF create(QPointF start, QPointF end, std::optional<double> ratio, bool symmetric = false);
+}
+
+// Swift's CropDrag: a frame being made, moved or resized.
+struct CropDrag {
+    enum class Kind { create, move, resize };
+    struct Mode {
+        Kind kind;
+        int index = 0;
+    };
+    QPointF start;
+    QRectF original;
+    Mode mode;
+    // Symmetric (Alt) keeps the frame's middle still.
+    QRectF updated(QPointF point, std::optional<double> ratio, bool symmetric = false) const;
+};
+
+// Swift's CropSnap: dragged edges drawn to nearby edges.
+struct CropSnap {
+    std::vector<double> xs;
+    std::vector<double> ys;
+    // In document pixels.
+    double tolerance;
+    QRectF apply(QRectF rect, const CropDrag &drag, QPointF point, std::optional<double> ratio, bool symmetric = false) const;
+};