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>

tests/SubjectRemovalFailureTests.cpp

@@ -0,0 +1,55 @@
+#include "AddressSpaceLimit.h"
+#include "Document/BrushStroke.h"
+#include "Document/SubjectRemoval.h"
+#include "IO/ImageExporter.h"
+#include <QPainter>
+#include <QtTest>
+#include <malloc.h>
+
+// Remove Background's preview when memory runs out.
+class SubjectRemovalFailureTests : public QObject {
+    Q_OBJECT
+private slots:
+    // Large requests always map memory the limit counts.
+    void initTestCase() { mallopt(M_MMAP_THRESHOLD, 64 * 1024); }
+    void aPreviewThatFindsNoMemoryIsARenderError();
+    void aModelRunThatFindsNoMemoryIsARenderError();
+};
+
+namespace {
+QImage disc(int width, int height)
+{
+    QImage image = BrushRaster::context(width, height, false);
+    image.fill(Qt::white);
+    QPainter painter(&image);
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(QColor(217, 26, 26));
+    painter.drawEllipse(QPointF(width / 2.0, height / 2.0), width / 5.0, height / 5.0);
+    return image;
+}
+}
+
+void SubjectRemovalFailureTests::aPreviewThatFindsNoMemoryIsARenderError()
+{
+    const QImage large = disc(6000, 4000);
+    // The model's mask is kept; the preview copies 96 MB.
+    QCOMPARE(SubjectRemoval::subjectMask(large, std::nullopt, FilterSettings()).size(), large.size());
+    malloc_trim(0);
+    const AddressSpaceLimit limit(8ll * 1024 * 1024);
+    QVERIFY_THROWS_EXCEPTION(ExportError, SubjectRemoval::run(large, FilterSettings()));
+}
+
+void SubjectRemovalFailureTests::aModelRunThatFindsNoMemoryIsARenderError()
+{
+    if (!placesStarvation())
+        QSKIP("the failure point is placed for Qt 6.4's allocations");
+    QCOMPARE(SubjectRemoval::subjectMask(disc(200, 150), std::nullopt, FilterSettings()).size(), QSize(200, 150));
+    // A new image, whose model input finds no room.
+    const QImage fresh = disc(320, 320);
+    malloc_trim(0);
+    const AddressSpaceLimit limit(512ll * 1024);
+    QVERIFY_THROWS_EXCEPTION(ExportError, SubjectRemoval::run(fresh, FilterSettings()));
+}
+
+QTEST_GUILESS_MAIN(SubjectRemovalFailureTests)
+#include "SubjectRemovalFailureTests.moc"