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/PixelAdjust.h

@@ -0,0 +1,19 @@
+#pragma once
+#include "Document/Selection.h"
+#include <QImage>
+#include <QTransform>
+
+// Shared plumbing for whole-image adjustments.
+namespace PixelAdjust {
+// A small preview for the Layers panel, like an import's.
+QImage thumbnail(const QImage &image);
+// Selection coverage on the image's own pixel grid.
+QImage coverage(const SelectionClip &selection, int width, int height, const QTransform &pixelToDocument);
+// coverage × adjusted + (1 − coverage) × original.
+QImage blend(const QImage &adjusted, const QImage &original, const SelectionClip &selection,
+             const QTransform &pixelToDocument, bool isMask);
+// Core Image's Gaussian on stored values; `clamped` repeats the edge.
+QImage gaussianBlur(const QImage &image, double sigma, bool clamped);
+// Core Image's motion blur: a Gaussian taper along the angle.
+QImage motionBlur(const QImage &image, double radius, double angle);
+}