[nostalgia/gfx/studio/tilesheet] Mark DrawCommands as obsolete if no changes

src/nostalgia/modules/gfx/src/studio/tilesheeteditor/commands/drawcommand.cpp

@@ -63,7 +63,7 @@ DrawCommand::DrawCommand(
 		TileSheet &img,
 		TileSheet::SubSheetIdx subSheetIdx,
 		std::size_t idx,
-		int palIdx) noexcept:
+		int const palIdx) noexcept:
 		m_img(img),
 		m_subSheetIdx(std::move(subSheetIdx)),
 		m_palIdx(palIdx) {
@@ -75,7 +75,7 @@ DrawCommand::DrawCommand(
 		TileSheet &img,
 		TileSheet::SubSheetIdx subSheetIdx,
 		ox::SpanView<std::size_t> const&idxList,
-		int palIdx) noexcept:
+		int const palIdx) noexcept:
 		m_img(img),
 		m_subSheetIdx(std::move(subSheetIdx)),
 		m_palIdx(palIdx) {
@@ -123,7 +123,9 @@ void DrawCommand::lineUpdate(ox::Point a, ox::Point b) noexcept {
 		for (int32_t i{}; i < range; ++i) {
 			auto const idx = ptToIdx(x, y + i * mod, ss.columns * TileWidth);
 			if (idx < ss.pixels.size()) {
-				m_changes.emplace_back(static_cast<uint32_t>(idx), getPixel(ss, idx));
+				if (m_palIdx != getPixel(ss, idx)) {
+					m_changes.emplace_back(static_cast<uint32_t>(idx), getPixel(ss, idx));
+				}
 			}
 		}
 	});
@@ -154,4 +156,8 @@ TileSheet::SubSheetIdx const&DrawCommand::subsheetIdx() const noexcept {
 	return m_subSheetIdx;
 }
 
+void DrawCommand::finish() noexcept {
+	setObsolete(m_changes.empty());
+}
+
 }

src/nostalgia/modules/gfx/src/studio/tilesheeteditor/commands/drawcommand.hpp

@@ -52,6 +52,8 @@ class DrawCommand: public TileSheetCommand {
 		[[nodiscard]]
 		TileSheet::SubSheetIdx const&subsheetIdx() const noexcept override;
 
+		void finish() noexcept;
+
 };
 
 }

src/nostalgia/modules/gfx/src/studio/tilesheeteditor/tilesheeteditormodel.cpp

@@ -172,7 +172,7 @@ void TileSheetEditorModel::drawLineCommand(ox::Point const &pt, std::size_t cons
 	if (m_ongoingDrawCommand) {
 		m_ongoingDrawCommand->lineUpdate(m_lineStartPt, pt);
 		m_updated = true;
-	} else if (getPixel(activeSubSheet, idx) != palIdx) {
+	} else {
 		std::ignore = pushCommand(ox::make<DrawCommand>(
 			m_img, m_activeSubsSheetIdx, idx, static_cast<int>(palIdx)));
 		m_lineStartPt = pt;
@@ -180,7 +180,10 @@ void TileSheetEditorModel::drawLineCommand(ox::Point const &pt, std::size_t cons
 }
 
 void TileSheetEditorModel::endDrawCommand() noexcept {
-	m_ongoingDrawCommand = nullptr;
+	if (m_ongoingDrawCommand) {
+		m_ongoingDrawCommand->finish();
+		m_ongoingDrawCommand = nullptr;
+	}
 }
 
 void TileSheetEditorModel::addSubsheet(TileSheet::SubSheetIdx const&parentIdx) noexcept {

src/olympic/studio/modlib/src/undostack.cpp

@@ -7,9 +7,7 @@
 namespace studio {
 
 ox::Error UndoStack::push(ox::UPtr<UndoCommand> &&cmd) noexcept {
-	for (auto const i = m_stackIdx; i < m_stack.size();) {
-		std::ignore = m_stack.erase(i);
-	}
+	m_stack.resize(m_stackIdx);
 	OX_RETURN_ERROR(cmd->redo());
 	redoTriggered.emit(cmd.get());
 	changeTriggered.emit(cmd.get());
@@ -25,22 +23,29 @@ ox::Error UndoStack::push(ox::UPtr<UndoCommand> &&cmd) noexcept {
 }
 
 ox::Error UndoStack::redo() noexcept {
-	if (m_stackIdx < m_stack.size()) {
-		auto &c = m_stack[m_stackIdx];
-		OX_RETURN_ERROR(c->redo());
+	while (m_stackIdx < m_stack.size()) {
+		auto const &c = m_stack[m_stackIdx];
 		++m_stackIdx;
-		redoTriggered.emit(c.get());
-		changeTriggered.emit(c.get());
+		if (!c->isObsolete()) {
+			OX_RETURN_ERROR(c->redo());
+			redoTriggered.emit(c.get());
+			changeTriggered.emit(c.get());
+			break;
+		}
 	}
 	return {};
 }
 
 ox::Error UndoStack::undo() noexcept {
-	if (m_stackIdx) {
-		auto &c = m_stack[--m_stackIdx];
-		OX_RETURN_ERROR(c->undo());
-		undoTriggered.emit(c.get());
-		changeTriggered.emit(c.get());
+	while (m_stackIdx) {
+		--m_stackIdx;
+		auto const &c = m_stack[m_stackIdx];
+		if (!c->isObsolete()) {
+			OX_RETURN_ERROR(c->undo());
+			undoTriggered.emit(c.get());
+			changeTriggered.emit(c.get());
+			break;
+		}
 	}
 	return {};
 }