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>
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#include "IO/ImageExporter.h"
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#include "AddressSpaceLimit.h"
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#include "Document/LayerMask.h"
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#include "RenderFixtures.h"
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#include <QColorSpace>
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#include <QImageReader>
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#include <QTemporaryDir>
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#include <QtTest>
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namespace {
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ImportedImage asset(const QImage &image, const QString &name)
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{
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return ImportedImage(image, image, name);
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}
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// A 2x2 image, left column red, 4x4 at (1,1).
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ProjectSnapshot snapshot(double rotation = 0, bool flip = false)
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{
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QImage image = BrushRaster::context(2, 2, false);
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image.setPixel(0, 0, qRgba(255, 0, 0, 255));
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image.setPixel(0, 1, qRgba(255, 0, 0, 255));
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const QUuid id = QUuid::createUuid();
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const LayerTransform transform{.origin = {1, 1}, .size = {4, 4}, .rotation = rotation, .flipX = flip, .sampling = LayerSampling::nearest};
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const ProjectLayerRecord record{.id = id, .name = "Red", .isVisible = true, .transform = transform, .imageFile = id.toString(QUuid::WithoutBraces) + ".png"};
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return {.manifest = {.documentID = QUuid::createUuid(), .width = 6, .height = 6, .activeLayerID = id, .layers = {record}},
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.images = {{id, asset(image, "Red")}}};
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}
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QImage decoded(const QByteArray &data)
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{
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return QImage::fromData(data).convertToFormat(QImage::Format_RGBA8888);
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}
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}
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class ExportTests : public QObject {
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Q_OBJECT
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private slots:
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void pngPreservesDimensionsAlphaOrientationAndTransforms_data();
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void pngPreservesDimensionsAlphaOrientationAndTransforms();
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void orderVisibilityClippingAndAtomicOverwrite();
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void blankCanvasAndOversizedCanvas();
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void resolutionTravelsWithThePixels();
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void missingPixelsAndCyclesAreRefused();
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void masksFoldersAndClippingReachTheExport();
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void aFileThatCannotBeWrittenThrowsAndKeepsTheOldOne();
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void blendModesAndPlacedMasksReachTheExport();
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void aSnapshotsMaskFollowsItsRecord();
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void aCanvasThatCannotBeAllocatedThrows();
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void exportsAreLogged();
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};
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void ExportTests::pngPreservesDimensionsAlphaOrientationAndTransforms_data()
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{
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QTest::addColumn<double>("rotation");
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QTest::addColumn<bool>("flip");
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QTest::addColumn<QPoint>("red");
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QTest::addColumn<QPoint>("clear");
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QTest::newRow("upright") << 0.0 << false << QPoint(1, 1) << QPoint(4, 1);
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QTest::newRow("flipped") << 0.0 << true << QPoint(4, 1) << QPoint(1, 1);
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QTest::newRow("a right angle") << 90.0 << false << QPoint(1, 1) << QPoint(1, 4);
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}
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void ExportTests::pngPreservesDimensionsAlphaOrientationAndTransforms()
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{
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QFETCH(double, rotation);
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QFETCH(bool, flip);
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QFETCH(QPoint, red);
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QFETCH(QPoint, clear);
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const QByteArray data = ImageExporter::pngData(snapshot(rotation, flip));
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QVERIFY(data.startsWith("\x89PNG"));
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const QImage image = decoded(data);
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QCOMPARE(image.size(), QSize(6, 6));
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QCOMPARE(QImage::fromData(data).colorSpace(), QColorSpace(QColorSpace::SRgb));
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QCOMPARE(image.pixel(red), qRgba(255, 0, 0, 255));
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QCOMPARE(qAlpha(image.pixel(clear)), 0);
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QCOMPARE(qAlpha(image.pixel(0, 0)), 0);
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}
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void ExportTests::orderVisibilityClippingAndAtomicOverwrite()
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{
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const ProjectSnapshot original = snapshot();
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const QUuid id = QUuid::createUuid();
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QTemporaryDir directory;
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const QString path = directory.filePath("Export.png");
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for (const bool visible : {true, false}) {
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ProjectSnapshot stacked = original;
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stacked.images.insert({id, asset(solid(1, 1, qRgba(0, 0, 255, 255)), "Blue")});
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// The blue layer reaches past the canvas on every side.
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stacked.manifest.layers.push_back({.id = id, .name = "Blue", .isVisible = visible,
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.transform = {.origin = {-2, -2}, .size = {10, 10}}, .imageFile = "blue.png"});
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ImageExporter::exportPNG(stacked, path);
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const QImage written = QImage(path).convertToFormat(QImage::Format_RGBA8888);
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QCOMPARE(written.size(), QSize(6, 6));
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QCOMPARE(written.pixel(1, 1), visible ? qRgba(0, 0, 255, 255) : qRgba(255, 0, 0, 255));
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QCOMPARE(written.pixel(5, 5), visible ? qRgba(0, 0, 255, 255) : qRgba(0, 0, 0, 0));
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}
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QCOMPARE(QDir(directory.path()).entryList(QDir::Files), QStringList{"Export.png"});
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}
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void ExportTests::blankCanvasAndOversizedCanvas()
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{
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const ProjectSnapshot blank{.manifest = {.documentID = QUuid::createUuid(), .width = 2, .height = 2, .activeLayerID = std::nullopt, .layers = {}}, .images = {}};
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QCOMPARE(decoded(ImageExporter::pngData(blank)).pixel(1, 1), qRgba(0, 0, 0, 0));
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const auto sized = [](int width, int height) {
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return ProjectSnapshot{.manifest = {.documentID = QUuid::createUuid(), .width = width, .height = height, .activeLayerID = std::nullopt, .layers = {}}, .images = {}};
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};
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for (const QSize &size : {QSize(30'000, 30'000), QSize(30'001, 1), QSize(1, 30'001), QSize(0, 5), QSize(5, 0), QSize(10'001, 10'000)}) {
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try {
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ImageExporter::render(sized(size.width(), size.height()));
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QFAIL("an oversized or empty canvas must be refused");
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} catch (const ExportError &error) {
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QCOMPARE(error.kind, ExportError::Kind::tooLarge);
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}
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}
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QCOMPARE(ImageExporter::render(sized(30'000, 1)).image.size(), QSize(30'000, 1));
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QCOMPARE(ImageExporter::render(sized(1, 30'000)).image.size(), QSize(1, 30'000));
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}
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void ExportTests::resolutionTravelsWithThePixels()
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{
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ProjectSnapshot print = snapshot();
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QCOMPARE(ImageExporter::render(print).resolution, 72.0);
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QCOMPARE(QImage::fromData(ImageExporter::pngData(print)).dotsPerMeterX(), 2835);
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print.manifest.resolution = 300;
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QCOMPARE(ImageExporter::render(print).resolution, 300.0);
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const QImage png = QImage::fromData(ImageExporter::pngData(print));
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QCOMPARE(png.dotsPerMeterX(), 11811);
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QCOMPARE(png.dotsPerMeterY(), 11811);
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const QImage jpeg = QImage::fromData(ImageExporter::jpeg(ImageExporter::render(print), {}).data);
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QCOMPARE(qRound(jpeg.dotsPerMeterX() * 0.0254), 300);
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QCOMPARE(qRound(jpeg.dotsPerMeterY() * 0.0254), 300);
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}
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void ExportTests::missingPixelsAndCyclesAreRefused()
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{
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const auto kind = [](const ProjectSnapshot &broken) -> std::optional<ProjectError::Kind> {
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try {
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ImageExporter::render(broken);
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} catch (const ProjectError &error) {
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return error.kind;
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}
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return std::nullopt;
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};
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ProjectSnapshot noPixels = snapshot();
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noPixels.images.clear();
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QCOMPARE(kind(noPixels), std::optional(ProjectError::Kind::missingImage));
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ProjectSnapshot noMask = snapshot();
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noMask.manifest.layers[0].maskFile = "mask.png";
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QCOMPARE(kind(noMask), std::optional(ProjectError::Kind::missingImage));
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noMask.masks.insert({noMask.manifest.layers[0].id, asset(gray(2, 2, 255), "Mask")});
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QCOMPARE(kind(noMask), std::nullopt);
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// A folder has no image file and needs no pixels.
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ProjectSnapshot folder = snapshot();
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folder.manifest.layers.push_back({.id = QUuid::createUuid(), .name = "Folder", .isVisible = true, .transform = {}, .imageFile = std::nullopt,
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.isGroup = true});
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QCOMPARE(kind(folder), std::nullopt);
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ProjectSnapshot cyclic = snapshot();
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cyclic.manifest.layers[0].maskSourceID = cyclic.manifest.layers[0].id;
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QCOMPARE(kind(cyclic), std::optional(ProjectError::Kind::invalid));
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}
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void ExportTests::masksFoldersAndClippingReachTheExport()
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{
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// The Swift live-mask fixtures, exported: red under a hidden source.
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const auto pixels = [](std::array<int, 4> alpha, int color) {
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QImage image = BrushRaster::context(2, 2, false);
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for (int index = 0; index < 4; ++index)
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image.setPixel(index % 2, index / 2, qRgba(color * alpha[index] / 255, 0, 0, alpha[index]));
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return image;
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};
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const auto alphas = [](const QImage &image) {
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return std::array<int, 4>{qAlpha(image.pixel(0, 0)), qAlpha(image.pixel(1, 0)), qAlpha(image.pixel(0, 1)), qAlpha(image.pixel(1, 1))};
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};
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const QUuid target = QUuid::createUuid(), source = QUuid::createUuid(), folder = QUuid::createUuid();
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const LayerTransform whole{.origin = {0, 0}, .size = {2, 2}, .sampling = LayerSampling::nearest};
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ProjectSnapshot linked{.manifest = {.documentID = QUuid::createUuid(), .width = 2, .height = 2, .activeLayerID = target,
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.layers = {{.id = target, .name = "Target", .isVisible = true, .transform = whole, .imageFile = "t.png", .maskSourceID = source},
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{.id = source, .name = "Source", .isVisible = false, .transform = whole, .imageFile = "s.png"}}},
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.images = {{target, asset(pixels({255, 255, 255, 255}, 255), "Target")}, {source, asset(pixels({255, 0, 128, 255}, 0), "Source")}}};
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QCOMPARE(alphas(ImageExporter::render(linked).image), (std::array<int, 4>{255, 0, 128, 255}));
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linked.manifest.layers[0].opacity = 0.5;
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QCOMPARE(alphas(ImageExporter::render(linked).image), (std::array<int, 4>{127, 0, 64, 127}));
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// The layer's own mask multiplies in.
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linked.manifest.layers[0].maskFile = "mask.png";
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linked.masks.insert({target, asset(gray(2, 2, 128), "Mask")});
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QCOMPARE(alphas(ImageExporter::render(linked).image), (std::array<int, 4>{64, 0, 32, 64}));
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linked.manifest.layers[0].maskEnabled = false;
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QCOMPARE(alphas(ImageExporter::render(linked).image), (std::array<int, 4>{127, 0, 64, 127}));
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// A visible neighbour clipped to its base forms a stack.
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ProjectSnapshot stack{.manifest = {.documentID = QUuid::createUuid(), .width = 2, .height = 2, .activeLayerID = target,
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.layers = {{.id = source, .name = "Base", .isVisible = true, .transform = whole, .imageFile = "s.png"},
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{.id = target, .name = "Top", .isVisible = true, .transform = whole, .imageFile = "t.png", .maskSourceID = source}}},
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.images = {{target, asset(pixels({255, 255, 255, 255}, 255), "Top")}, {source, asset(pixels({255, 128, 32, 0}, 0), "Base")}}};
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const QImage clipped = ImageExporter::render(stack).image;
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QCOMPARE(alphas(clipped), (std::array<int, 4>{255, 128, 32, 0}));
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QCOMPARE(qRed(clipped.pixel(1, 0)), 128);
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// A folder's mask covers what lies inside it, nothing else.
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stack.manifest.layers.insert(stack.manifest.layers.begin(), {.id = folder, .name = "Folder", .isVisible = true, .transform = whole,
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.imageFile = std::nullopt, .isGroup = true, .maskFile = "folder.png"});
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stack.masks.insert({folder, asset(gray(2, 2, 128), "Folder mask")});
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stack.manifest.layers[1].parentID = folder;
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stack.manifest.layers[2].parentID = folder;
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QCOMPARE(alphas(ImageExporter::render(stack).image), (std::array<int, 4>{128, 64, 16, 0}));
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// A disabled folder mask clips nothing.
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stack.manifest.layers[0].maskEnabled = false;
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QCOMPARE(alphas(ImageExporter::render(stack).image), (std::array<int, 4>{255, 128, 32, 0}));
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stack.manifest.layers[0].maskEnabled = true;
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stack.manifest.layers[1].parentID = std::nullopt;
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stack.manifest.layers[2].parentID = std::nullopt;
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QCOMPARE(alphas(ImageExporter::render(stack).image), (std::array<int, 4>{255, 128, 32, 0}));
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}
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void ExportTests::blendModesAndPlacedMasksReachTheExport()
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{
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const QUuid below = QUuid::createUuid(), above = QUuid::createUuid(), child = QUuid::createUuid();
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const LayerTransform whole{.origin = {0, 0}, .size = {4, 4}, .sampling = LayerSampling::nearest};
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ProjectSnapshot blended{.manifest = {.documentID = QUuid::createUuid(), .width = 4, .height = 4, .activeLayerID = above,
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.layers = {{.id = below, .name = "Below", .isVisible = true, .transform = whole, .imageFile = "b.png"},
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{.id = above, .name = "Above", .isVisible = true, .transform = whole, .imageFile = "a.png",
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.blendMode = LayerBlendMode::multiply}}},
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.images = {{below, asset(solid(4, 4, qRgba(200, 100, 50, 255)), "Below")}, {above, asset(solid(4, 4, qRgba(128, 128, 128, 255)), "Above")}}};
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QCOMPARE(ImageExporter::render(blended).image.pixel(1, 1), qRgba(100, 50, 25, 255));
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blended.manifest.layers[1].blendMode = std::nullopt;
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QCOMPARE(ImageExporter::render(blended).image.pixel(1, 1), qRgba(128, 128, 128, 255));
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// A stack blends with its base's mode; absent means Normal.
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blended.images.insert({child, asset(solid(4, 4, qRgba(128, 128, 128, 255)), "Child")});
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blended.manifest.layers.push_back({.id = child, .name = "Child", .isVisible = true, .transform = whole, .imageFile = "c.png", .maskSourceID = above});
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QCOMPARE(ImageExporter::render(blended).image.pixel(1, 1), qRgba(128, 128, 128, 255));
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blended.manifest.layers[1].blendMode = LayerBlendMode::multiply;
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QCOMPARE(ImageExporter::render(blended).image.pixel(1, 1), qRgba(100, 50, 25, 255));
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blended.manifest.layers.pop_back();
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// A mask moved apart hides by where it sits.
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blended.manifest.layers[1].blendMode = std::nullopt;
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blended.manifest.layers[1].maskFile = "mask.png";
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QImage halves = gray(2, 1, 255);
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halves.scanLine(0)[1] = 0;
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blended.masks.insert({above, asset(halves, "Mask")});
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// Over the whole layer its right half hides.
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const QImage whole4 = ImageExporter::render(blended).image;
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QCOMPARE(whole4.pixel(1, 1), qRgba(128, 128, 128, 255));
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QCOMPARE(whole4.pixel(2, 1), qRgba(200, 100, 50, 255));
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// Placed right, only the last column hides; white borders show.
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blended.manifest.layers[1].maskPlacement = LayerTransform{.origin = {2, 0}, .size = {2, 4}, .sampling = LayerSampling::nearest};
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const QImage placed = ImageExporter::render(blended).image;
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QCOMPARE(placed.pixel(0, 1), qRgba(128, 128, 128, 255));
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QCOMPARE(placed.pixel(2, 1), qRgba(128, 128, 128, 255));
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QCOMPARE(placed.pixel(3, 1), qRgba(200, 100, 50, 255));
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}
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void ExportTests::aSnapshotsMaskFollowsItsRecord()
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{
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ProjectSnapshot masked = snapshot();
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ProjectLayerRecord &layer = masked.manifest.layers[0];
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masked.masks.insert({layer.id, asset(gray(2, 2, 77), "Mask")});
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// No mask file, no mask, whatever the snapshot holds.
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QVERIFY(!masked.mask(layer).has_value());
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layer.maskFile = "mask.png";
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const LayerMask plain = masked.mask(layer).value();
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QCOMPARE(plain.asset.image(), gray(2, 2, 77));
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QCOMPARE(plain.isEnabled, true);
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QCOMPARE(plain.isLinked, true);
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QVERIFY(!plain.placement.has_value());
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// The two flags travel apart.
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layer.maskEnabled = false;
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layer.maskLinked = true;
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layer.maskPlacement = LayerTransform{.origin = {3, 4}, .size = {5, 6}};
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const LayerMask disabled = masked.mask(layer).value();
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QCOMPARE(disabled.isEnabled, false);
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QCOMPARE(disabled.isLinked, true);
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QCOMPARE(disabled.placement.value(), (LayerTransform{.origin = {3, 4}, .size = {5, 6}}));
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layer.maskEnabled = true;
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layer.maskLinked = false;
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const LayerMask unlinked = masked.mask(layer).value();
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QCOMPARE(unlinked.isEnabled, true);
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QCOMPARE(unlinked.isLinked, false);
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masked.masks.clear();
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QVERIFY(!masked.mask(layer).has_value());
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}
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void ExportTests::aFileThatCannotBeWrittenThrowsAndKeepsTheOldOne()
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{
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QTemporaryDir directory;
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const QString path = directory.filePath("kept.png");
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ImageExporter::write("first", path);
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ImageExporter::write("second", path);
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QFile kept(path);
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QVERIFY(kept.open(QIODevice::ReadOnly));
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QCOMPARE(kept.readAll(), QByteArray("second"));
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QTest::ignoreMessage(QtWarningMsg, QRegularExpression("could not write .*"));
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QVERIFY_EXCEPTION_THROWN(ImageExporter::write("third", directory.filePath("missing/folder/file.png")), std::runtime_error);
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}
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void ExportTests::aCanvasThatCannotBeAllocatedThrows()
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{
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// 10,000 x 10,000 pixels need 400 MB.
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const ProjectSnapshot large{.manifest = {.documentID = QUuid::createUuid(), .width = 10'000, .height = 10'000, .activeLayerID = std::nullopt, .layers = {}},
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.images = {}};
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std::optional<AddressSpaceLimit> limit(std::in_place, 64 * 1024 * 1024);
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std::optional<ExportError::Kind> thrown;
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try {
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ImageExporter::render(large);
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} catch (const ExportError &error) {
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thrown = error.kind;
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}
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limit.reset();
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QCOMPARE(thrown, std::optional(ExportError::Kind::render));
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}
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void ExportTests::exportsAreLogged()
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{
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QTemporaryDir directory;
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const QString path = directory.filePath("logged.png");
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QTest::ignoreMessage(QtInfoMsg, "rendered 6 x 6 from 1 visible layers");
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QTest::ignoreMessage(QtInfoMsg, QRegularExpression("wrote \\d+ bytes to \".*logged.png\""));
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ImageExporter::exportPNG(snapshot(), path);
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}
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QTEST_MAIN(ExportTests)
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#include "ExportTests.moc"
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