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 "BrushFixtures.h"
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#include "CanvasFixtures.h"
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#include "SelectionCanvasFixtures.h"
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#include "SelectionFixtures.h"
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// Painting on the canvas: nothing away from the brush moves.
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namespace {
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struct Shift {
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int start;
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int finish;
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bool committed;
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};
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// Swift's canvasShift: a big photo scaled down, painted mid.
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Shift canvasShift(bool paintingMask, double layerScale = 0.25)
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{
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Shown shown(QSize(800, 600), QSize(800, 600));
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EditorSession &session = shown.session;
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const QImage photo = noise(2400, 1800, 3);
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session.insert(ImportedImage(photo, photo, "Photo"));
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const QUuid id = session.activeLayerID().value();
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LayerTransform transform{.origin = {100, 75}, .size = {2400 * layerScale, 1800 * layerScale}};
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transform.sampling = LayerSampling::high;
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rewrite(session, [&](ProjectSnapshot &snapshot) { record(snapshot, id).transform = transform; });
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session.selectLayer(id);
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if (paintingMask) {
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session.addLayerMask();
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if (!session.isMaskSelected())
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throw std::runtime_error("the mask was not targeted");
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}
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shown.settle();
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session.selectTool(NavigationTool::brush);
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BrushSettings settings = session.brushSettings();
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settings.diameter = 30;
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session.setBrushSettings(settings);
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const auto snapshot = [&] {
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shown.canvas->synchronizeDisplay();
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return shown.canvas->grab().toImage().convertToFormat(QImage::Format_RGBA8888);
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};
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// The brushed area in view pixels, grown generously.
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const QPointF brush = transform.center();
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const QSizeF size = session.document().value().size();
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const QPointF topLeft = session.viewport.viewPoint(QPointF(brush.x() - 60, brush.y() - 40), size);
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const QPointF bottomRight = session.viewport.viewPoint(QPointF(brush.x() + 80, brush.y() + 40), size);
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const auto largestDifference = [&](const QImage &a, const QImage &b) {
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const double perPoint = double(a.width()) / shown.canvas->width();
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const QRectF box(topLeft.x() * perPoint, topLeft.y() * perPoint, (bottomRight.x() - topLeft.x()) * perPoint, (bottomRight.y() - topLeft.y()) * perPoint);
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int largest = 0;
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for (int y = 0; y < a.height(); ++y) {
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const uchar *rowA = a.constScanLine(y), *rowB = b.constScanLine(y);
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for (int x = 0; x < a.width(); ++x) {
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if (box.contains(QPointF(x, y)))
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continue;
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for (int c = 0; c < 4; ++c)
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largest = std::max(largest, std::abs(int(rowA[x * 4 + c]) - int(rowB[x * 4 + c])));
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}
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}
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return largest;
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};
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const QImage before = snapshot();
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session.beginBrush(brush);
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session.continueBrush(QPointF(brush.x() + 20, brush.y()));
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const QImage during = snapshot();
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session.finishBrushImmediately();
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const QImage after = snapshot();
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const ImageLayer layer = session.activeLayer().value();
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const bool committed = paintingMask ? layer.mask.value().asset.raster != nullptr : layer.asset.value().raster != nullptr;
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return {largestDifference(before, during), largestDifference(during, after), committed};
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}
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}
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class BrushCanvasTests : public QObject {
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Q_OBJECT
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private slots:
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void paintingAScaledDownLayerDoesNotShiftItsPixels();
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void paintingAScaledDownLayersMaskDoesNotShiftItsPixels();
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void theCanvasRepaintsEveryStrokeStepAndDeleteClearsOrDeletes();
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void aPlacedMaskStrokeShowsTheLayerThroughItsPreview();
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void aStrokeStepRepaintsWhereItWentAlone();
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void paintingAFolderMaskClipsItsLayersLive();
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void aStripedFolderMaskKeepsItsShadeWhilePainted();
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};
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void BrushCanvasTests::paintingAScaledDownLayerDoesNotShiftItsPixels()
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{
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const Shift shift = canvasShift(false);
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QVERIFY2(shift.committed, "the stroke was committed");
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QVERIFY2(shift.start <= 3, qPrintable(QStringLiteral("starting to paint changed pixels away from the brush by %1").arg(shift.start)));
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QVERIFY2(shift.finish <= 3, qPrintable(QStringLiteral("finishing the stroke changed pixels away from the brush by %1").arg(shift.finish)));
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}
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void BrushCanvasTests::paintingAScaledDownLayersMaskDoesNotShiftItsPixels()
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{
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const Shift shift = canvasShift(true);
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QVERIFY2(shift.committed, "the mask stroke was committed");
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QVERIFY2(shift.start <= 3, qPrintable(QStringLiteral("starting to paint the mask changed pixels away from the brush by %1").arg(shift.start)));
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QVERIFY2(shift.finish <= 3, qPrintable(QStringLiteral("finishing the mask stroke changed pixels away from the brush by %1").arg(shift.finish)));
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}
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void BrushCanvasTests::theCanvasRepaintsEveryStrokeStepAndDeleteClearsOrDeletes()
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{
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Shown shown(QSize(400, 300), QSize(400, 300));
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EditorSession &session = shown.session;
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QImage blue = BrushRaster::context(400, 300, false);
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blue.fill(Qt::blue);
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session.insert(ImportedImage(blue, blue, "Blue"));
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shown.settle();
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session.zoom(1);
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session.selectTool(NavigationTool::brush);
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session.setBrushSettings(brush(20, 1, 1, 0, 0));
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shown.canvas->synchronizeDisplay();
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// Each step of a stroke is a new display state.
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session.beginBrush(QPointF(50, 50));
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QVERIFY(shown.canvas->synchronizeDisplay());
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QCOMPARE(shown.canvas->grab().toImage().pixelColor(50, 50), QColor(Qt::red));
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QCOMPARE(shown.canvas->grab().toImage().pixelColor(200, 50), QColor(Qt::blue));
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session.continueBrush(QPointF(200, 50));
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QVERIFY(shown.canvas->synchronizeDisplay());
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QVERIFY(!shown.canvas->synchronizeDisplay());
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QCOMPARE(shown.canvas->grab().toImage().pixelColor(200, 50), QColor(Qt::red));
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session.finishBrush();
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QVERIFY(shown.canvas->synchronizeDisplay());
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QCOMPARE(shown.canvas->grab().toImage().pixelColor(200, 50), QColor(Qt::red));
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// Delete clears a selection; without one it deletes the layer.
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session.selectTool(NavigationTool::marquee);
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session.applySelection(rectPath(QRectF(0, 0, 100, 300)), SelectionMode::replace, "Select");
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QTRY_VERIFY(shown.canvas->hasFocus());
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QTest::keyClick(shown.canvas, Qt::Key_Delete);
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QTRY_COMPARE(session.history.undoName(), QString("Clear"));
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session.deselect();
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const int layers = int(session.document().value().layers.size());
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QTest::keyClick(shown.canvas, Qt::Key_Backspace);
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QCOMPARE(int(session.document().value().layers.size()), layers - 1);
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// With Ctrl or Alt the key is not Delete's.
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session.undo();
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QTest::keyClick(shown.canvas, Qt::Key_Delete, Qt::ControlModifier);
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QCOMPARE(int(session.document().value().layers.size()), layers);
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}
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void BrushCanvasTests::aPlacedMaskStrokeShowsTheLayerThroughItsPreview()
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{
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Shown shown(QSize(200, 200), QSize(200, 200));
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EditorSession &session = shown.session;
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QImage blue = BrushRaster::context(64, 64, false);
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blue.fill(Qt::blue);
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session.insert(ImportedImage(blue, blue, "Blue"), QPointF(96, 56));
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const QUuid id = session.activeLayerID().value();
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// A black 16 px mask at 32 from (80,40): hidden.
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rewrite(session, [&](ProjectSnapshot &snapshot) {
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setMask(snapshot, id, LayerMask::assetFrom(BrushRaster::context(16, 16, true)));
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record(snapshot, id).maskPlacement = LayerTransform{.origin = {80, 40}, .size = {32, 32}};
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record(snapshot, id).maskLinked = false;
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});
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session.selectLayerTarget(id, true);
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shown.settle();
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session.zoom(1);
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session.selectTool(NavigationTool::brush);
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session.setBrushSettings(brush(8, 1, 1, 1, 1));
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session.setMaskPaintWhite(true);
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shown.canvas->synchronizeDisplay();
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QVERIFY(shown.canvas->grab().toImage().pixelColor(88, 48) != QColor(Qt::blue));
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session.beginBrush(QPointF(88, 48));
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QVERIFY(shown.canvas->synchronizeDisplay());
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QCOMPARE(shown.canvas->grab().toImage().pixelColor(88, 48), QColor(Qt::blue));
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QVERIFY(shown.canvas->grab().toImage().pixelColor(70, 70) != QColor(Qt::blue));
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session.finishBrush();
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QCOMPARE(shown.canvas->grab().toImage().pixelColor(88, 48), QColor(Qt::blue));
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}
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void BrushCanvasTests::aStrokeStepRepaintsWhereItWentAlone()
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{
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Shown shown(QSize(400, 300), QSize(400, 300));
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EditorSession &session = shown.session;
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session.addBlankLayer();
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shown.settle();
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session.zoom(1);
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session.selectTool(NavigationTool::brush);
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session.setBrushSettings(brush(20, 1, 1, 0, 0));
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shown.canvas->synchronizeDisplay();
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QTest::qWait(50);
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PaintSpy spy(*shown.canvas);
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// The first tile alone, two points out: not everything.
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session.beginBrush(QPointF(50, 50));
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QVERIFY(shown.canvas->synchronizeDisplay());
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QTRY_VERIFY(spy.count > 0);
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QCOMPARE(spy.painted, QRect(0, 0, 258, 258));
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spy.painted = QRect();
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spy.count = 0;
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// Into the next tile: both, still not everything.
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session.continueBrush(QPointF(300, 50));
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QVERIFY(shown.canvas->synchronizeDisplay());
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QTRY_VERIFY(spy.count > 0);
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QCOMPARE(spy.painted, QRect(0, 0, 400, 258));
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session.cancelBrush();
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}
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void BrushCanvasTests::paintingAFolderMaskClipsItsLayersLive()
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{
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Shown shown(QSize(300, 300), QSize(300, 300));
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EditorSession &session = shown.session;
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QImage red = BrushRaster::context(100, 100, false);
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red.fill(Qt::red);
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session.insert(ImportedImage(red, red, "Red"), QPointF(100, 100));
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session.groupSelectedLayers();
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session.addLayerMask(true);
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QVERIFY(session.isMaskSelected() && session.activeLayer().value().isGroup);
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shown.settle();
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session.selectTool(NavigationTool::brush);
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session.setBrushSettings(brush(20, 1, 0, 0, 0));
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session.setMaskPaintWhite(false);
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for (double zoom : {1.0, 3.0}) {
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session.zoom(zoom);
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shown.canvas->synchronizeDisplay();
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// Both points on screen at 3x: the view spans 100–200.
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const QSizeF size = session.document().value().size();
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const QPoint centre = session.viewport.viewPoint(QPointF(125, 125), size).toPoint();
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const QPoint edge = session.viewport.viewPoint(QPointF(105, 105), size).toPoint();
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QVERIFY(QRect(QPoint(0, 0), shown.canvas->size()).contains(edge));
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QCOMPARE(shown.canvas->grab().toImage().pixelColor(centre), QColor(Qt::red));
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// Black on the mask hides the red at once.
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session.beginBrush(QPointF(125, 125));
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QVERIFY(shown.canvas->synchronizeDisplay());
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QVERIFY(shown.canvas->grab().toImage().pixelColor(centre) != QColor(Qt::red));
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QCOMPARE(shown.canvas->grab().toImage().pixelColor(edge), QColor(Qt::red));
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session.finishBrush();
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shown.canvas->synchronizeDisplay();
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QVERIFY(shown.canvas->grab().toImage().pixelColor(centre) != QColor(Qt::red));
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session.undo();
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QVERIFY(session.isMaskSelected());
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}
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}
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void BrushCanvasTests::aStripedFolderMaskKeepsItsShadeWhilePainted()
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{
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Shown shown(QSize(1200, 1200), QSize(300, 300));
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EditorSession &session = shown.session;
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QImage red = BrushRaster::context(1200, 1200, false);
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red.fill(Qt::red);
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session.insert(ImportedImage(red, red, "Red"));
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session.groupSelectedLayers();
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const QUuid folder = session.activeLayerID().value();
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// One-pixel stripes: halved at a quarter, they read gray.
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QImage stripes = BrushRaster::context(1200, 1200, true);
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for (int y = 0; y < 1200; ++y) {
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for (int x = 0; x < 1200; x += 2)
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stripes.scanLine(y)[x] = 255;
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}
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rewrite(session, [&](ProjectSnapshot &snapshot) { setMask(snapshot, folder, LayerMask::assetFrom(stripes)); });
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session.selectLayerTarget(folder, true);
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QVERIFY(session.isMaskSelected());
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shown.settle();
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session.zoom(0.25);
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session.selectTool(NavigationTool::brush);
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session.setBrushSettings(brush(40, 1, 1, 1, 1));
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session.setMaskPaintWhite(true);
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shown.canvas->synchronizeDisplay();
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const QPoint far = session.viewport.viewPoint(QPointF(1000, 1000), session.document().value().size()).toPoint();
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const auto shade = [&] { return shown.canvas->grab().toImage().pixelColor(far); };
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const auto near = [](const QColor &a, const QColor &b) {
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return std::abs(a.red() - b.red()) <= 3 && std::abs(a.green() - b.green()) <= 3 && std::abs(a.blue() - b.blue()) <= 3;
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};
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const QColor before = shade();
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QVERIFY(before != QColor(Qt::red));
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// Far from each dab, the untouched shade stays put.
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for (const QPointF dab : {QPointF(100, 100), QPointF(100, 300)}) {
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session.beginBrush(dab);
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QVERIFY(shown.canvas->synchronizeDisplay());
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const QColor during = shade();
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QVERIFY2(near(before, during), qPrintable(QStringLiteral("%1 then %2").arg(before.name(), during.name())));
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session.finishBrush();
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shown.canvas->synchronizeDisplay();
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QVERIFY(near(before, shade()));
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// The second dab reads the tiles the first one painted.
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QVERIFY(layerWith(session, folder).mask.value().asset.raster);
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}
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}
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QTEST_MAIN(BrushCanvasTests)
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#include "BrushCanvasTests.moc"
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