Magic tool Object mode (Compositor 1.1.8)

src/Document/Selection+Modify.cpp

@@ -0,0 +1,83 @@
+#include "Document/EditorSession.h"
+#include <cmath>
+
+// Select's Expand, Contract and Feather, and their amounts.
+void EditorSession::setSelectionExpandAmount(int amount)
+{
+    m_selectionExpandAmount = amount;
+    notify();
+}
+
+void EditorSession::setSelectionContractAmount(int amount)
+{
+    m_selectionContractAmount = amount;
+    notify();
+}
+
+void EditorSession::setSelectionFeatherAmount(int amount)
+{
+    m_selectionFeatherAmount = amount;
+    notify();
+}
+
+void EditorSession::setSelectionAmountOperation(std::optional<SelectionAmountOperation> operation)
+{
+    m_selectionAmountOperation = operation;
+    resumeFileRequests();
+    notify();
+}
+
+bool EditorSession::canModifySelection() const
+{
+    const std::optional<DocumentSelection> current = selection();
+    return current && !current->isEmpty() && canEditSelection() && !m_lassoDraft;
+}
+
+void EditorSession::expandSelection(int amount)
+{
+    resizeSelection(amount, QStringLiteral("Expand Selection"));
+}
+
+void EditorSession::contractSelection(int amount)
+{
+    resizeSelection(-amount, QStringLiteral("Contract Selection"));
+}
+
+void EditorSession::promptSelectionAmount(SelectionAmountOperation operation)
+{
+    if (!canModifySelection())
+        return;
+    setSelectionAmountOperation(operation);
+}
+
+void EditorSession::confirmSelectionAmount(int amount)
+{
+    const std::optional<SelectionAmountOperation> operation = m_selectionAmountOperation;
+    if (!operation || amount < 1 || amount > (*operation == SelectionAmountOperation::feather ? 250 : 500))
+        return;
+    setSelectionAmountOperation(std::nullopt);
+    switch (*operation) {
+    case SelectionAmountOperation::expand:
+        setSelectionExpandAmount(amount);
+        expandSelection(amount);
+        break;
+    case SelectionAmountOperation::contract:
+        setSelectionContractAmount(amount);
+        contractSelection(amount);
+        break;
+    case SelectionAmountOperation::feather:
+        setSelectionFeatherAmount(amount);
+        featherSelection(amount);
+        break;
+    }
+}
+
+void EditorSession::featherSelection(int amount)
+{
+    const std::optional<DocumentSelection> current = selection();
+    if (!canModifySelection() || !current || amount <= 0)
+        return;
+    // Two soft edges spread less than their sum.
+    const double softened = std::sqrt(current->feather * current->feather + double(amount) * amount);
+    setSelection(DocumentSelection{current->path, current->antialiased, std::min(250.0, softened)}, QStringLiteral("Feather Selection"));
+}