雷电芽衣andClaude
c864304695
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>
354 lines
19 KiB
C++
354 lines
19 KiB
C++
#include "Document/BrushStroke.h"
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#include "Document/Distort.h"
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#include "IO/ImageExporter.h"
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#include "SessionFixtures.h"
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#include <QtTest>
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// Free distortion: the warp, the session's edit, masks along.
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namespace {
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const Corners shape = {QPointF(10, 10), QPointF(60, 10), QPointF(30, 30), QPointF(10, 30)};
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QImage red(int width, int height)
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{
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QImage image(width, height, QImage::Format_RGBA8888_Premultiplied);
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image.fill(Qt::red);
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return image;
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}
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QUuid insertAt(EditorSession &session, const QImage &image, QPointF origin)
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{
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session.insert(ImportedImage(image, image, "Image"));
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const QUuid id = session.activeLayerID().value();
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rewrite(session, [&](ProjectSnapshot &snapshot) { record(snapshot, id).transform.origin = origin; });
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return id;
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}
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int alphaAt(const EditorSession &session, int x, int y)
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{
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return ImageExporter::render(session.projectSnapshot().value()).image.pixelColor(x, y).alpha();
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}
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bool near(QPointF a, QPointF b)
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{
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return std::abs(a.x() - b.x()) < 1e-6 && std::abs(a.y() - b.y()) < 1e-6;
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}
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}
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class DistortTests : public QObject {
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Q_OBJECT
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private slots:
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void cornersRunClockwiseFromTheTopLeft();
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void perspectiveMappingHitsTheCornersAndTwistedShapesAreRefused();
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void distortingWarpsTheLayerIntoTheShapeAsOneUndoStep();
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void distortedLayerIsTrimmedToItsVisiblePixels();
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void foldedShapesWarpAsTwoTrianglesAndFlipsSwapCorners();
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void carriedCornersAndWarpedMasks();
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void nudgesGroupsAndRefusals();
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void mapPathCarriesCurvesFlipsAndTheFillRule();
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};
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void DistortTests::cornersRunClockwiseFromTheTopLeft()
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{
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const LayerTransform upright{.origin = {10, 20}, .size = {40, 30}};
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QCOMPARE(DistortWarp::corners(upright), (Corners{QPointF(10, 20), QPointF(50, 20), QPointF(50, 50), QPointF(10, 50)}));
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// Turned, each corner is where the transform puts it.
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const LayerTransform turned{.origin = {10, 20}, .size = {40, 30}, .rotation = 37, .flipX = true};
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const Corners corners = DistortWarp::corners(turned);
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const std::array<QPointF, 4> unit = {QPointF(0, 0), QPointF(1, 0), QPointF(1, 1), QPointF(0, 1)};
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for (size_t index = 0; index < 4; ++index)
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QVERIFY(near(corners[index], turned.point(unit[index])));
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QVERIFY(!near(corners[1], corners[0]));
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}
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void DistortTests::perspectiveMappingHitsTheCornersAndTwistedShapesAreRefused()
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{
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const QTransform map = DistortWarp::homography(shape);
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const Corners unit = {QPointF(0, 0), QPointF(1, 0), QPointF(1, 1), QPointF(0, 1)};
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for (size_t index = 0; index < 4; ++index)
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QVERIFY2(near(map.map(unit[index]), shape[index]), qPrintable(QString("corner %1").arg(index)));
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// The middle lands where the diagonals cross, a perspective.
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const QPointF middle = map.map(QPointF(0.5, 0.5));
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QVERIFY(std::abs(middle.x() - 170.0 / 7) < 1e-9 && std::abs(middle.y() - 170.0 / 7) < 1e-9);
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// A slanted bottom too: both perspective terms at work.
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const Corners slanted = {QPointF(10, 10), QPointF(60, 10), QPointF(30, 40), QPointF(10, 30)};
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const QTransform slant = DistortWarp::homography(slanted);
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for (size_t index = 0; index < 4; ++index)
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QVERIFY(near(slant.map(unit[index]), slanted[index]));
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const QPointF crossing = slant.map(QPointF(0.5, 0.5));
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QVERIFY(std::abs(crossing.x() - 390.0 / 19) < 1e-9 && std::abs(crossing.y() - 490.0 / 19) < 1e-9);
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QVERIFY(DistortWarp::isUsable(shape) && DistortWarp::isConvex(shape));
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// A bow tie folds: usable as two triangles, no perspective.
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const Corners bowTie = {shape[0], shape[2], shape[1], shape[3]};
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const Corners collapsed = {shape[0], shape[0], shape[2], shape[3]};
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QVERIFY(DistortWarp::isUsable(bowTie) && !DistortWarp::isConvex(bowTie));
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QVERIFY(!DistortWarp::isUsable(collapsed));
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// A flat half is refused; a straight side, no perspective.
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QVERIFY(!DistortWarp::isUsable({QPointF(10, 10), QPointF(60, 10), QPointF(30, 30), QPointF(20, 20)}));
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QVERIFY(DistortWarp::isUsable({QPointF(10, 10), QPointF(60, 10), QPointF(60, 30), QPointF(60, 50)}));
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QVERIFY(!DistortWarp::isConvex({QPointF(10, 10), QPointF(60, 10), QPointF(60, 30), QPointF(60, 50)}));
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QVERIFY(!DistortWarp::isUsable({shape[0], QPointF(std::nan(""), 10), shape[2], shape[3]}));
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QVERIFY(!DistortWarp::isUsable({shape[0], QPointF(2'000'000, 10), shape[2], shape[3]}));
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// A dent is usable but no perspective: two triangles.
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const Corners dented = {QPointF(10, 10), QPointF(60, 10), QPointF(15, 15), QPointF(10, 60)};
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QVERIFY(DistortWarp::isUsable(dented) && !DistortWarp::isConvex(dented));
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// Mirrored winding still counts as convex.
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QVERIFY(DistortWarp::isConvex({shape[1], shape[0], shape[3], shape[2]}));
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}
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void DistortTests::distortingWarpsTheLayerIntoTheShapeAsOneUndoStep()
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{
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EditorSession session;
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session.createDocument(100, 60);
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const QUuid id = insertAt(session, red(20, 20), QPointF(10, 10));
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session.selectTool(NavigationTool::move);
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session.beginTransform(false);
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session.beginDistort();
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QVERIFY(session.transformEdit().value().corners.has_value() && session.transformEdit().value().persistent);
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// A collapsed corner: ignored.
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session.previewCorners({shape[0], shape[0], shape[2], shape[3]});
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QCOMPARE(session.transformEdit().value().corners.value()[1], QPointF(30, 10));
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session.previewCorners(shape);
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QCOMPARE(session.transformEdit().value().corners.value(), shape);
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const int count = session.history.undoCount();
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session.commitTransform();
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QVERIFY(!session.transformEdit().has_value());
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QCOMPARE(session.history.undoCount(), count + 1);
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QCOMPARE(session.history.undoName(), QString("Distort"));
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const LayerTransform transform = layerWith(session, id).transform;
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QCOMPARE(transform, (LayerTransform{.origin = {10, 10}, .size = {50, 20}}));
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QCOMPARE(layerWith(session, id).asset.value().size(), QSize(50, 20));
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QCOMPARE(alphaAt(session, 50, 12), 255);
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QCOMPARE(alphaAt(session, 15, 25), 255);
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QCOMPARE(alphaAt(session, 50, 28), 0);
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QCOMPARE(alphaAt(session, 80, 12), 0);
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session.undo();
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QCOMPARE(layerWith(session, id).transform.size, QSizeF(20, 20));
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QCOMPARE(layerWith(session, id).asset.value().size(), QSize(20, 20));
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}
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void DistortTests::distortedLayerIsTrimmedToItsVisiblePixels()
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{
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EditorSession session;
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session.createDocument(100, 60);
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// A 40 by 20 layer, clear except a red square.
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QImage image(40, 20, QImage::Format_RGBA8888_Premultiplied);
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image.fill(Qt::transparent);
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QPainter painter(&image);
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painter.fillRect(QRect(15, 5, 10, 10), Qt::red);
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painter.end();
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const QUuid id = insertAt(session, image, QPointF(10, 10));
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session.selectTool(NavigationTool::move);
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session.beginTransform(false);
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session.beginDistort();
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session.previewCorners({QPointF(10, 10), QPointF(60, 10), QPointF(50, 30), QPointF(10, 30)});
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session.commitTransform();
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const LayerTransform transform = layerWith(session, id).transform;
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// Bounds of 50 by 20; the square's warp is smaller.
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QVERIFY2(transform.size.width() < 20 && transform.size.height() <= 12, qPrintable(QString("%1 x %2").arg(transform.size.width()).arg(transform.size.height())));
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QVERIFY2(transform.origin.x() >= 20 && transform.origin.y() >= 14, qPrintable(QString("%1, %2").arg(transform.origin.x()).arg(transform.origin.y())));
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QCOMPARE(alphaAt(session, 30, 20), 255);
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// The trimmed asset is the layer's own size.
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QCOMPARE(QSizeF(layerWith(session, id).asset.value().size()), transform.size);
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}
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void DistortTests::foldedShapesWarpAsTwoTrianglesAndFlipsSwapCorners()
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{
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const LayerTransform placed{.origin = {10, 10}, .size = {20, 20}};
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QVERIFY_THROWS_EXCEPTION(ProjectError, DistortWarp::warp(red(20, 20), placed, {shape[0], shape[0], shape[2], shape[3]}, false));
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// A shape too large for a warp.
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QVERIFY_THROWS_EXCEPTION(ProjectError, DistortWarp::warp(red(20, 20), placed, {QPointF(0, 0), QPointF(40'000, 0), QPointF(40'000, 10), QPointF(0, 10)}, false));
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const Corners dented = {QPointF(10, 10), QPointF(60, 10), QPointF(15, 15), QPointF(10, 60)};
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const DistortWarp::Warped folded = DistortWarp::warp(red(20, 20), placed, dented, false);
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// Copied without interpolation: a colour boundary stays sharp.
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QImage twoTone = red(20, 20);
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QPainter painter(&twoTone);
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painter.fillRect(QRect(0, 0, 10, 20), Qt::blue);
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painter.end();
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const Corners wide = {QPointF(10, 10), QPointF(110, 10), QPointF(20, 20), QPointF(10, 110)};
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const DistortWarp::Warped sharp = DistortWarp::warp(twoTone, placed, wide, false);
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// The half is sheared: its colour boundary sits at 45.5.
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QCOMPARE(sharp.image.pixelColor(43, 0), QColor(Qt::blue));
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QCOMPARE(sharp.image.pixelColor(47, 0), QColor(Qt::red));
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QCOMPARE(folded.transform, (LayerTransform{.origin = {10, 10}, .size = {50, 50}}));
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QCOMPARE(folded.image.size(), QSize(50, 50));
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QCOMPARE(folded.image.pixelColor(20, 2).alpha(), 255);
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QCOMPARE(folded.image.pixelColor(2, 20).alpha(), 255);
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QCOMPARE(folded.image.pixelColor(40, 4).alpha(), 0);
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QCOMPARE(folded.image.pixelColor(45, 45).alpha(), 0);
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// The halves meet along the diagonal without a seam.
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const DistortWarp::Warped seam = DistortWarp::warp(red(20, 20), {.origin = {0, 0}, .size = {20, 20}}, {QPointF(0, 0), QPointF(100, 0), QPointF(30, 30), QPointF(0, 100)}, false);
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for (const int along : {10, 15, 25})
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QCOMPARE(seam.image.pixelColor(along, along).alpha(), 255);
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QCOMPARE(seam.image.pixelColor(50, 5).alpha(), 255);
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QCOMPARE(seam.image.pixelColor(5, 50).alpha(), 255);
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QCOMPARE(seam.image.pixelColor(60, 60).alpha(), 0);
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// Past a half's edge nothing draws, though its map would.
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const DistortWarp::Warped spill = DistortWarp::warp(red(20, 20), {.origin = {0, 0}, .size = {20, 20}}, {QPointF(0, 0), QPointF(100, 0), QPointF(30, 30), QPointF(10, 5)}, false);
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QCOMPARE(spill.image.pixelColor(40, 10).alpha(), 255);
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QCOMPARE(spill.image.pixelColor(5, 20).alpha(), 0);
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QCOMPARE(spill.image.pixelColor(10, 20).alpha(), 0);
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// A centre a sloping edge holds is kept; fractions too.
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const DistortWarp::Warped sloping = DistortWarp::warp(red(20, 20), {.origin = {0, 0}, .size = {20, 20}}, {QPointF(0, 0), QPointF(100, 1), QPointF(25, 26), QPointF(0, 100)}, false);
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QVERIFY(sloping.image.pixelColor(5, 0).alpha() > 200);
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QVERIFY(sloping.image.pixelColor(2, 40).alpha() > 200);
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// Beside the diagonal each pixel comes from its own half.
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QImage patterned(20, 20, QImage::Format_RGBA8888_Premultiplied);
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for (int y = 0; y < 20; ++y) {
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for (int x = 0; x < 20; ++x)
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patterned.setPixelColor(x, y, QColor(12 * x, 12 * y, 0));
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}
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const DistortWarp::Warped beside = DistortWarp::warp(patterned, {.origin = {0, 0}, .size = {20, 20}}, {QPointF(0, 0), QPointF(100, 1), QPointF(25, 26), QPointF(0, 100)}, false);
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QCOMPARE(beside.image.pixelColor(20, 20), QColor(180, 180, 0));
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// A fractional shared edge, met both ways, has no hole.
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const DistortWarp::Warped shared = DistortWarp::warp(red(20, 20), {.origin = {0, 0}, .size = {20, 20}}, {QPointF(0.1, 0.9), QPointF(100, 0.9), QPointF(20.1, 30.9), QPointF(0.1, 100)}, false);
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for (const QPoint hole : {QPoint(4, 7), QPoint(6, 10), QPoint(8, 13)})
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QCOMPARE(shared.image.pixelColor(hole).alpha(), 255);
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const DistortWarp::Warped fractional = DistortWarp::warp(red(20, 20), {.origin = {0, 0}, .size = {20, 20}}, {QPointF(0.4, 0.4), QPointF(60.6, 0.4), QPointF(20.5, 20.5), QPointF(0.4, 60.6)}, false);
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QCOMPARE(fractional.image.pixelColor(30, 5).alpha(), 255);
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QCOMPARE(fractional.image.pixelColor(5, 30).alpha(), 255);
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QCOMPARE(fractional.image.pixelColor(40, 40).alpha(), 0);
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for (const int along : {8, 12, 16})
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QCOMPARE(fractional.image.pixelColor(along, along).alpha(), 255);
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QVERIFY(fractional.image.pixelColor(30, 0).alpha() > 100);
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// A row centred on a horizontal top edge is drawn.
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const DistortWarp::Warped topEdge = DistortWarp::warp(red(20, 20), {.origin = {0, 0}, .size = {20, 20}}, {QPointF(0.5, 0.5), QPointF(100.5, 0.5), QPointF(30, 30), QPointF(0, 100)}, false);
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QVERIFY(topEdge.image.pixelColor(50, 0).alpha() > 100);
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// Where the halves overlap the second replaces the first.
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QImage faint(20, 20, QImage::Format_RGBA8888_Premultiplied);
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faint.fill(QColor(128, 0, 0, 128));
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const DistortWarp::Warped bowTie = DistortWarp::warp(faint, {.origin = {0, 0}, .size = {20, 20}}, {QPointF(0, 0), QPointF(40, 40), QPointF(40, 0), QPointF(0, 40)}, false);
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QCOMPARE(bowTie.image.pixelColor(20, 10).alpha(), 128);
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QCOMPARE(qAlpha(bowTie.image.pixel(20, 10)), 128);
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// A limit shrinks the warp; a flip sends pixels across.
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const DistortWarp::Warped small = DistortWarp::warp(twoTone, placed, shape, false, 25);
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QCOMPARE(small.image.size(), QSize(25, 10));
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QCOMPARE(small.transform, (LayerTransform{.origin = {10, 10}, .size = {50, 20}}));
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QCOMPARE(small.image.pixelColor(2, 2), QColor(Qt::blue));
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LayerTransform flipped = placed;
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flipped.flipX = true;
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const DistortWarp::Warped mirrored = DistortWarp::warp(twoTone, flipped, shape, false);
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QCOMPARE(mirrored.image.pixelColor(2, 2), QColor(Qt::red));
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QCOMPARE(mirrored.image.pixelColor(40, 2), QColor(Qt::blue));
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// The sampling travels with the placement.
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LayerTransform nearest = placed;
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nearest.sampling = LayerSampling::nearest;
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QCOMPARE(DistortWarp::warp(twoTone, nearest, shape, false).transform.sampling, LayerSampling::nearest);
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}
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void DistortTests::carriedCornersAndWarpedMasks()
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{
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const LayerTransform box{.origin = {10, 10}, .size = {20, 20}};
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// The box lands on the shape; one moved aside, aside.
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const Corners same = DistortWarp::carried(box, box, shape);
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for (size_t index = 0; index < 4; ++index)
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QVERIFY(near(same[index], shape[index]));
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const LayerTransform turned{.origin = {10, 10}, .size = {20, 20}, .rotation = 30};
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const Corners turnedSame = DistortWarp::carried(turned, turned, shape);
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for (size_t index = 0; index < 4; ++index)
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QVERIFY(near(turnedSame[index], shape[index]));
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const Corners moved = {QPointF(20, 20), QPointF(40, 20), QPointF(40, 40), QPointF(20, 40)};
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const Corners aside = DistortWarp::carried({.origin = {15, 15}, .size = {20, 20}}, box, moved);
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for (size_t index = 0; index < 4; ++index)
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QVERIFY(near(aside[index], moved[index] + QPointF(5, 5)));
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// A mask's background fills the shape's surround.
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QImage mask(4, 4, QImage::Format_Grayscale8);
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mask.fill(200);
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const Corners half = {QPointF(0, 0), QPointF(8, 0), QPointF(4, 4), QPointF(0, 4)};
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const LayerTransform grid{.origin = {0, 0}, .size = {4, 4}};
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const DistortWarp::Warped lit = DistortWarp::warpMask(mask, grid, half, 1);
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QCOMPARE(lit.image.size(), QSize(8, 4));
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QCOMPARE(lit.image.format(), QImage::Format_Grayscale8);
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QCOMPARE(int(lit.image.constScanLine(3)[7]), 255);
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QVERIFY(std::abs(int(lit.image.constScanLine(1)[1]) - 200) <= 2);
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const DistortWarp::Warped dark = DistortWarp::warpMask(mask, grid, half, 0);
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QCOMPARE(int(dark.image.constScanLine(3)[7]), 0);
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// A uniform mask covers any shape as it is.
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QImage uniform(1, 1, QImage::Format_Grayscale8);
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uniform.fill(255);
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const DistortWarp::Warped kept = DistortWarp::warpMask(uniform, grid, half, 1);
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QCOMPARE(kept.image.cacheKey(), uniform.cacheKey());
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QCOMPARE(kept.transform, (LayerTransform{.origin = {0, 0}, .size = {8, 4}}));
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}
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void DistortTests::nudgesGroupsAndRefusals()
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{
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EditorSession session;
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session.beginDistort();
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session.previewCorners(shape);
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session.createDocument(100, 60);
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const QUuid a = insertAt(session, red(20, 20), QPointF(10, 10));
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const QUuid b = insertAt(session, red(10, 10), QPointF(50, 30));
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session.selectLayer(a);
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// Without an edit or corners, nothing begins or moves.
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session.beginDistort();
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QVERIFY(!session.transformEdit().has_value());
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session.beginTransform();
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session.previewCorners(shape);
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QVERIFY(!session.transformEdit().value().corners.has_value());
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session.beginDistort();
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session.beginDistort();
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const Corners own = DistortWarp::corners(layerWith(session, a).transform);
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QCOMPARE(session.transformEdit().value().corners.value(), own);
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// A nudge moves the corners; a new begin keeps them.
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session.nudgeLayer(3, -2);
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QCOMPARE(session.transformEdit().value().draft.origin, QPointF(13, 8));
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QCOMPARE(session.transformEdit().value().corners.value()[2], own[2] + QPointF(3, -2));
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session.beginDistort();
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QCOMPARE(session.transformEdit().value().corners.value()[2], own[2] + QPointF(3, -2));
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session.cancelTransform();
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QCOMPARE(layerWith(session, a).transform.origin, QPointF(10, 10));
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// A group takes the box's perspective; an unlinked mask stays.
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rewrite(session, [&](ProjectSnapshot &snapshot) {
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setMask(snapshot, b, coverage());
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record(snapshot, b).maskLinked = false;
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});
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session.selectLayers({a, b}, a);
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session.beginTransform();
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session.beginDistort();
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QCOMPARE(session.displayedMaskPlacement(layerWith(session, b)), std::optional(layerWith(session, b).transform));
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const Corners box = session.transformEdit().value().corners.value();
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QCOMPARE(box[0], QPointF(10, 10));
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QCOMPARE(box[2], QPointF(60, 40));
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session.previewCorners({box[0], box[1] + QPointF(20, 0), box[2], box[3]});
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QVERIFY(session.distortPreview(layerWith(session, b)).has_value());
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session.commitTransform();
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QCOMPARE(session.history.undoName(), QString("Distort Layers"));
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QVERIFY(layerWith(session, a).transform.size.width() > 20);
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QVERIFY(layerWith(session, b).transform.size.width() > 10);
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QCOMPARE(layerWith(session, b).transform.origin.x(), 50.0);
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}
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void DistortTests::mapPathCarriesCurvesFlipsAndTheFillRule()
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{
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// A 10-pixel layer at 10,10, its box the shape.
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const LayerTransform transform{.origin = {10, 10}, .size = {10, 10}};
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const QTransform placement = BrushRaster::pixelToDocument(transform, 10, 10);
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const Corners box = DistortWarp::corners(transform);
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QPainterPath ellipse;
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ellipse.addEllipse(QRectF(11, 11, 4, 4));
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ellipse.setFillRule(Qt::WindingFill);
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const QPainterPath carried = DistortWarp::mapPath(ellipse, placement, QSizeF(10, 10), transform, box).value();
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QCOMPARE(carried.fillRule(), Qt::WindingFill);
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QCOMPARE(carried.elementCount(), ellipse.elementCount());
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for (int i = 0; i < ellipse.elementCount(); ++i) {
|
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QCOMPARE(carried.elementAt(i).type, ellipse.elementAt(i).type);
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QVERIFY(near(carried.elementAt(i), ellipse.elementAt(i)));
|
|
}
|
|
// A flipped draft mirrors it inside the shape.
|
|
LayerTransform flipped = transform;
|
|
flipped.flipX = true;
|
|
QRectF bounds = DistortWarp::mapPath(ellipse, placement, QSizeF(10, 10), flipped, box).value().boundingRect();
|
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QVERIFY(near(bounds.topLeft(), QPointF(15, 11)) && near(bounds.bottomRight(), QPointF(19, 15)));
|
|
flipped = transform;
|
|
flipped.flipY = true;
|
|
bounds = DistortWarp::mapPath(ellipse, placement, QSizeF(10, 10), flipped, box).value().boundingRect();
|
|
QVERIFY(near(bounds.topLeft(), QPointF(11, 15)) && near(bounds.bottomRight(), QPointF(15, 19)));
|
|
// A folded shape or an empty grid carries nothing.
|
|
const Corners folded = {QPointF(10, 10), QPointF(20, 20), QPointF(20, 10), QPointF(10, 20)};
|
|
QVERIFY(!DistortWarp::mapPath(ellipse, placement, QSizeF(10, 10), transform, folded).has_value());
|
|
QVERIFY(!DistortWarp::mapPath(ellipse, placement, QSizeF(0, 10), transform, box).has_value());
|
|
}
|
|
|
|
QTEST_GUILESS_MAIN(DistortTests)
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#include "DistortTests.moc"
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