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 "Document/ProjectWorkspace.h"
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#include "IO/ProjectStore.h"
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#include "Rendering/EditorCanvas.h"
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#include "UI/NativeLayerList.h"
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#include <QApplication>
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#include <QDrag>
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#include <QDragEnterEvent>
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#include <QDragMoveEvent>
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#include <QDropEvent>
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#include <QKeyEvent>
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#include <QMimeData>
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#include <QMouseEvent>
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#include <QPainter>
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#include <QPainterPath>
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#include <QScrollBar>
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const QString NativeLayerList::maskType = QStringLiteral("com.compositor.layer-mask");
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const QString NativeLayerList::sourceType = QStringLiteral("com.compositor.layer-list");
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namespace {
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// A glyph drawn black over a white halo.
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void drawHaloed(QPainter &painter, const QPainterPath &path, double width)
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{
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painter.setBrush(Qt::NoBrush);
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painter.setPen(QPen(Qt::white, width + 2.4, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
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painter.drawPath(path);
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painter.setPen(QPen(Qt::black, width, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
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painter.drawPath(path);
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}
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}
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void LayerColumn::paintEvent(QPaintEvent *)
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{
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if (!indicator)
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return;
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QPainter painter(this);
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QColor accent = palette().color(QPalette::Highlight);
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if (!indicatorFills) {
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painter.fillRect(*indicator, accent);
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return;
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}
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accent.setAlphaF(0.3);
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painter.fillRect(*indicator, accent);
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painter.setPen(QPen(palette().color(QPalette::Highlight), 2));
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painter.drawRect(indicator->adjusted(1, 1, -1, -1));
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}
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std::unique_ptr<QMimeData> NativeLayerList::dragData(const LayerCell &cell) const
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{
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// The pressed row, with the selection it belongs to.
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const QSet<QUuid> selected = m_session.selectedLayerIDs();
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const bool whole = selected.contains(cell.layerID());
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QStringList lines;
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for (const ImageLayer &row : m_rows) {
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if (row.id == cell.layerID() || (whole && selected.contains(row.id)))
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lines << uuidString(row.id);
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}
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auto data = std::make_unique<QMimeData>();
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data->setData(ProjectWorkspace::layerType, lines.join(QLatin1Char('\n')).toUtf8());
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data->setData(sourceType, m_dragToken.toUtf8());
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return data;
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}
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// Alt offers a copy alone; plain drags move or copy.
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void NativeLayerList::startDrag(LayerCell &cell, Qt::KeyboardModifiers modifiers)
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{
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if (!m_session.canEditLayers())
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return;
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const bool copying = modifiers.testFlag(Qt::AltModifier) && !modifiers.testFlag(Qt::ControlModifier);
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auto *drag = new QDrag(this);
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drag->setMimeData(dragData(cell).release());
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drag->setPixmap(cell.grab());
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if (copying)
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drag->setDragCursor(CanvasView::duplicateCursor(devicePixelRatio()).pixmap(), Qt::CopyAction);
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drag->exec(copying ? Qt::CopyAction : Qt::MoveAction | Qt::CopyAction, copying ? Qt::CopyAction : Qt::MoveAction);
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}
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void NativeLayerList::startMaskDrag(LayerThumbnailButton &thumbnail)
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{
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auto *data = new QMimeData;
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data->setData(maskType, uuidString(thumbnail.layerID).toUtf8());
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auto *drag = new QDrag(this);
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drag->setMimeData(data);
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drag->setPixmap(thumbnail.grab());
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drag->exec(Qt::CopyAction);
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}
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// Dragged rows in order, folder contents left out; strangers none.
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std::vector<QUuid> NativeLayerList::draggedLayers(const QMimeData &data) const
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{
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const std::vector<QUuid> dropped = ProjectWorkspace::layerIDs(data);
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const QSet<QUuid> dragged(dropped.begin(), dropped.end());
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QSet<QUuid> carried;
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for (const QUuid &id : dragged)
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carried.unite(m_session.descendantIDs(id));
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std::vector<QUuid> result;
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for (const ImageLayer &row : m_rows) {
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if (dragged.contains(row.id) && !carried.contains(row.id))
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result.push_back(row.id);
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}
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return result;
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}
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std::optional<LayerDropTarget> NativeLayerList::dropTarget(const QMimeData &data, Qt::DropActions offered, QPoint listPoint) const
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{
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if (data.hasFormat(effectType)) {
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// An effect lands on whichever row is under the pointer.
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const int row = rowAt(listPoint);
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const std::optional<LayerEffectSelection> source = draggedEffect(data);
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if (row < 0 || !source || !m_session.canCopyEffect(source->kind, source->layerID, m_rows[row].id))
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return std::nullopt;
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return LayerDropTarget{.row = row, .onRow = true, .atBottom = false, .copying = true};
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}
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if (data.hasFormat(maskType)) {
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// A mask lands on whichever row is under the pointer.
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const int row = rowAt(listPoint);
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const std::optional<QUuid> source = ProjectWorkspace::layerID(QString::fromUtf8(data.data(maskType)));
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if (row < 0 || !source || !m_session.canCopyMask(*source, m_rows[row].id))
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return std::nullopt;
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return LayerDropTarget{.row = row, .onRow = true, .atBottom = false, .copying = true};
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}
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// Only this list's rows; canPlaceLayer covers canEditLayers.
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if (!data.hasFormat(ProjectWorkspace::layerType) || QString::fromUtf8(data.data(sourceType)) != m_dragToken)
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return std::nullopt;
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const std::vector<QUuid> ids = draggedLayers(data);
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if (ids.empty())
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return std::nullopt;
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// Swift duplicates when the source offers a copy alone (Alt).
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const bool copying = offered == Qt::CopyAction;
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// Folders are not duplicated: a copy with one is refused.
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for (const QUuid &id : ids) {
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if (copying && m_rows[size_t(indexOf(m_rows, id))].isGroup)
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return std::nullopt;
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}
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const QPoint inColumn = m_column->mapFrom(viewport(), viewport()->mapFrom(this, listPoint));
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int row = int(m_rows.size());
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bool onRow = false;
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for (size_t each = 0; each < m_cells.size(); ++each) {
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const QRect box = m_cells[each]->geometry();
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if (inColumn.y() < box.top() - 1) {
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row = int(each);
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break;
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}
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if (inColumn.y() > box.bottom() + 1)
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continue;
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// A folder's middle half takes the drop in.
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const bool middle = std::abs(inColumn.y() - box.center().y()) <= box.height() / 4;
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onRow = m_rows[each].isGroup && middle;
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row = onRow || inColumn.y() < box.center().y() ? int(each) : int(each) + 1;
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break;
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}
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const std::optional<QUuid> parent = onRow ? std::optional(m_rows[row].id) : row < int(m_rows.size()) ? m_rows[row].parentID : std::nullopt;
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for (const QUuid &id : ids) {
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if (!m_session.canPlaceLayer(id, parent))
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return std::nullopt;
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}
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return LayerDropTarget{.row = row, .onRow = onRow, .atBottom = row == int(m_rows.size()), .copying = copying};
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}
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bool NativeLayerList::acceptDrop(const QMimeData &data, Qt::DropActions offered, QPoint listPoint)
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{
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const std::optional<LayerDropTarget> target = dropTarget(data, offered, listPoint);
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if (!target)
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return false;
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if (data.hasFormat(effectType)) {
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const LayerEffectSelection source = draggedEffect(data).value();
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m_session.copyEffect(source.kind, source.layerID, m_rows[target->row].id);
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return true;
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}
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if (data.hasFormat(maskType)) {
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m_session.copyMask(ProjectWorkspace::layerID(QString::fromUtf8(data.data(maskType))).value(), m_rows[target->row].id);
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return true;
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}
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const std::vector<QUuid> ids = draggedLayers(data);
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// Where the drop lands is worked out once.
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const std::optional<QUuid> parent = target->onRow ? std::optional(m_rows[target->row].id)
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: target->atBottom ? std::nullopt
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: m_rows[target->row].parentID;
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const std::optional<QUuid> above = target->onRow || target->atBottom ? std::nullopt : std::optional(m_rows[target->row].id);
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// Above a row the last lands nearest; in folders, first.
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std::vector<QUuid> order = ids;
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if (target->onRow)
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std::reverse(order.begin(), order.end());
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const bool several = ids.size() > 1;
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m_session.beginEdit(target->copying ? (several ? QStringLiteral("Duplicate Layers") : QStringLiteral("Duplicate Layer"))
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: (several ? QStringLiteral("Move Layers") : QStringLiteral("Move Layer")));
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bool placed = false;
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for (const QUuid &id : order) {
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const bool done = target->copying ? m_session.duplicateLayer(id, parent, above, target->atBottom)
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: m_session.placeLayer(id, parent, above, target->atBottom);
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placed = done || placed;
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}
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// The moved layers stay selected, to drag on together.
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if (placed && !target->copying)
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m_session.selectLayers(QSet<QUuid>(ids.begin(), ids.end()), ids.front());
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m_session.endEdit();
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return placed;
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}
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void NativeLayerList::showIndicator(const std::optional<LayerDropTarget> &target)
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{
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m_column->indicator = std::nullopt;
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if (target && target->onRow) {
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m_column->indicator = m_cells[size_t(target->row)]->geometry();
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m_column->indicatorFills = true;
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} else if (target) {
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const int y = target->atBottom ? m_cells.back()->geometry().bottom() + 1 : m_cells[size_t(target->row)]->geometry().top() - 1;
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m_column->indicator = QRect(0, y - 1, m_column->width(), 2);
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m_column->indicatorFills = false;
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}
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m_column->update();
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}
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// The list moves, or copies what Alt offers alone.
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void NativeLayerList::dragEnterEvent(QDragEnterEvent *event)
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{
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const std::optional<LayerDropTarget> target = dropTarget(*event->mimeData(), event->possibleActions(), viewport()->mapToParent(event->position().toPoint()));
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showIndicator(target);
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if (!target)
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return;
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event->setDropAction(target->copying ? Qt::CopyAction : Qt::MoveAction);
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event->accept();
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}
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void NativeLayerList::dragMoveEvent(QDragMoveEvent *event)
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{
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// Near an edge the list scrolls, as the table does.
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const QPoint inViewport = event->position().toPoint();
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m_dragPoint = inViewport;
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m_dragData = event->mimeData();
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m_dragActions = event->possibleActions();
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autoscroll(inViewport, *event->mimeData(), event->possibleActions());
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const std::optional<LayerDropTarget> target = dropTarget(*event->mimeData(), event->possibleActions(), viewport()->mapToParent(inViewport));
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if (!target) {
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event->ignore();
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return;
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}
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event->setDropAction(target->copying ? Qt::CopyAction : Qt::MoveAction);
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event->accept();
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}
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void NativeLayerList::autoscroll(QPoint inViewport, const QMimeData &data, Qt::DropActions offered)
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{
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const int margin = 16;
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const int overshoot = inViewport.y() < margin ? inViewport.y() - margin : std::max(0, inViewport.y() - (viewport()->height() - margin));
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if (overshoot != 0)
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verticalScrollBar()->setValue(verticalScrollBar()->value() + overshoot);
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// Held at the edge, the timer scrolls on; elsewhere, rests.
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if (overshoot != 0 && !m_edgeScroll.isActive())
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m_edgeScroll.start();
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else if (overshoot == 0)
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m_edgeScroll.stop();
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showIndicator(dropTarget(data, offered, viewport()->mapToParent(inViewport)));
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}
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void NativeLayerList::dragLeaveEvent(QDragLeaveEvent *)
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{
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m_edgeScroll.stop();
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m_dragData = nullptr;
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showIndicator(std::nullopt);
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}
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void NativeLayerList::dropEvent(QDropEvent *event)
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{
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m_edgeScroll.stop();
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m_dragData = nullptr;
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showIndicator(std::nullopt);
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const bool copying = event->possibleActions() == Qt::CopyAction;
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if (!acceptDrop(*event->mimeData(), event->possibleActions(), viewport()->mapToParent(event->position().toPoint())))
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return;
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event->setDropAction(copying ? Qt::CopyAction : Qt::MoveAction);
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event->accept();
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}
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// Photoshop's create and release clipping pointers, haloed.
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QCursor NativeLayerList::clippingCursor(bool releasing, double ratio)
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{
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QPixmap pixmap(QSize(30, 28) * ratio);
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pixmap.setDevicePixelRatio(ratio);
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pixmap.fill(Qt::transparent);
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QPainter painter(&pixmap);
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painter.setRenderHint(QPainter::Antialiasing, true);
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// An arrow turning down and right, at the left.
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QPainterPath arrow(QPointF(4, 3));
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arrow.lineTo(QPointF(4, 12));
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arrow.lineTo(QPointF(14, 12));
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arrow.moveTo(QPointF(10.5, 8.5));
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arrow.lineTo(QPointF(14, 12));
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arrow.lineTo(QPointF(10.5, 15.5));
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drawHaloed(painter, arrow, 1.8);
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// A box with a badge: plus creates, minus releases.
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QPainterPath box;
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box.addRoundedRect(QRectF(12, 11, 15, 12), 2, 2);
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drawHaloed(painter, box, 1.6);
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QPainterPath badge;
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badge.addEllipse(QPointF(25, 12), 4.5, 4.5);
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painter.setPen(QPen(Qt::white, 1.4));
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painter.setBrush(Qt::black);
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painter.drawPath(badge);
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painter.setPen(QPen(Qt::white, 1.4, Qt::SolidLine, Qt::RoundCap));
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painter.drawLine(QPointF(22.5, 12), QPointF(27.5, 12));
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if (!releasing)
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painter.drawLine(QPointF(25, 9.5), QPointF(25, 14.5));
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return QCursor(pixmap, 3, 3);
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}
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QCursor NativeLayerList::cursorFor(QPoint listPoint, Qt::KeyboardModifiers modifiers) const
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{
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const int row = rowAt(listPoint);
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if (row < 0 || !(modifiers & (Qt::AltModifier | Qt::ControlModifier)))
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return QCursor(Qt::ArrowCursor);
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const ImageLayer &layer = m_rows[size_t(row)];
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LayerCell &cell = *m_cells[size_t(row)];
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const QPoint inCell = cell.mapFrom(this, listPoint);
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const double ratio = devicePixelRatio();
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// Ctrl over a thumbnail loads it as a selection.
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if (modifiers.testFlag(Qt::ControlModifier)) {
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for (const LayerThumbnailButton *thumbnail : {&cell.thumbnail(), &cell.maskThumbnail()}) {
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if (thumbnail->isVisible() && thumbnail->isEnabled() && thumbnail->geometry().contains(inCell))
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return CanvasView::loadSelectionCursor(ratio);
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}
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return QCursor(Qt::ArrowCursor);
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}
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const bool editable = m_session.canEditLayers();
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// A mask copies, the row duplicates, the strip clips.
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if (cell.maskThumbnail().isVisible() && cell.maskThumbnail().geometry().contains(inCell))
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return editable ? CanvasView::duplicateCursor(ratio) : QCursor(Qt::ArrowCursor);
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if (!isClippingZone(cell, inCell))
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return editable && !layer.isGroup ? CanvasView::duplicateCursor(ratio) : QCursor(Qt::ArrowCursor);
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if (!m_session.canToggleClippingMask(layer.id))
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return QCursor(Qt::ArrowCursor);
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return clippingCursor(layer.maskSourceID.has_value(), ratio);
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}
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// A modifier changed: the cursor is worked out again.
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void NativeLayerList::refreshCursor()
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{
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viewport()->setCursor(m_hover ? cursorFor(*m_hover, QApplication::keyboardModifiers()) : QCursor(Qt::ArrowCursor));
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}
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void NativeLayerList::showEvent(QShowEvent *event)
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{
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QScrollArea::showEvent(event);
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// Alt pressed anywhere changes the cursor over the rows.
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qApp->installEventFilter(this);
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}
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void NativeLayerList::hideEvent(QHideEvent *event)
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{
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qApp->removeEventFilter(this);
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QScrollArea::hideEvent(event);
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}
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// Alt, Ctrl or hover over rows sets the cursor.
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bool NativeLayerList::eventFilter(QObject *watched, QEvent *event)
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{
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if (event->type() == QEvent::KeyPress || event->type() == QEvent::KeyRelease) {
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const int key = static_cast<QKeyEvent *>(event)->key();
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if (key == Qt::Key_Alt || key == Qt::Key_Control)
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refreshCursor();
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} else if (event->type() == QEvent::MouseMove && watched->isWidgetType() && isAncestorOf(static_cast<QWidget *>(watched))) {
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const auto *mouse = static_cast<QMouseEvent *>(event);
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m_hover = mapFromGlobal(mouse->globalPosition().toPoint());
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viewport()->setCursor(cursorFor(*m_hover, mouse->modifiers()));
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}
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return QScrollArea::eventFilter(watched, event);
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}
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bool NativeLayerList::viewportEvent(QEvent *event)
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{
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if (event->type() == QEvent::Leave) {
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m_hover = std::nullopt;
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viewport()->setCursor(QCursor(Qt::ArrowCursor));
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}
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return QScrollArea::viewportEvent(event);
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}
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