Tag version 0.4-alpha

Attempts to move the Active Position upwards to a lesser numbered row,
or leftwards within the same row to a lesser numbered column, are now
highlighted red within the triplet list so the user can see which
triplets are being ignored due to these errors.

Detection for other triplet errors such as reserved bits/values or
object related errors will be added later on.

This is a part of moving the Active Position logic from the renderer
to the triplet list, so a renderer won't be needed if the ability to
editing (G)POP pages is added in the future.

README.md

@@ -5,6 +5,8 @@ Features
 - Load and save teletext pages in .tti format.
 - Rendering of teletext pages in Levels 1, 1.5, 2.5 and 3.5
 - Rendering of Local Objects and side panels.
+- Export PNG images of teletext pages.
+- Undo and redo of editing actions.
 - Interactive X/26 Local Enhancement Data triplet editor.
 - Editing of X/27/4 and X/27/5 compositional links to enhancement data pages.
 - Palette editor.
@@ -49,11 +51,9 @@ The Active Position, whether set explicitly by a "Set Active Position" triplet o
 - The Active Position can never be moved up to a lesser numbered row.
 - The Active Position can never be moved left *within the same row* to a lesser numbered column, but it can be moved left at the same time as it is moved down to a greater numbered row.
 
-If this rule is not followed then triplets in earlier screen addresses will be ignored.
+If this rule is not followed then triplets in earlier screen addresses will be ignored. Triplets that break this rule will be highlighted red in the X/26 triplet editor.
 
 ### Objects
-"Define ... Object" triplets need to declare that they are in the correct place in the triplet list e.g. if the Define Object triplet is at `d1 t3` in the list then the data field must show `Local: d1 t3`, otherwise the Object won't appear.
+Insert and deleting triplets from the list will upset the Object pointers on "Invoke" triplets and will need to be corrected afterwards. A future version of the editor may adjust these pointers automatically.
-
-Insert and deleting triplets from the list will upset the Object pointers on both "Define" and "Invoke" triplets and will need to be corrected afterwards. A future version of the editor may adjust these pointers automatically.
 
 "Invoke ... Object" triplets must point to a "Define ... Object" of the same type e.g. "Invoke *Active* Object" must point to a "Define *Active* Object", otherwise the Object won't appear.

document.cpp

@@ -17,12 +17,46 @@
  * along with QTeletextMaker.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <QAbstractListModel>
 #include <vector>
 
 #include "document.h"
 
 #include "levelonepage.h"
 
+ClutModel::ClutModel(QObject *parent): QAbstractListModel(parent)
+{
+	m_subPage = nullptr;
+}
+
+int ClutModel::rowCount(const QModelIndex & /*parent*/) const
+{
+	return 32;
+}
+
+QVariant ClutModel::data(const QModelIndex &index, int role) const
+{
+	if (!index.isValid())
+		return QVariant();
+
+	if (role == Qt::DisplayRole)
+		return QString("CLUT %1:%2").arg(index.row() >> 3).arg(index.row() & 0x07);
+
+	if (role == Qt::DecorationRole && m_subPage != nullptr)
+		return m_subPage->CLUTtoQColor(index.row());
+
+	return QVariant();
+}
+
+void ClutModel::setSubPage(LevelOnePage *subPage)
+{
+	if (subPage != m_subPage) {
+		m_subPage = subPage;
+		emit dataChanged(createIndex(0, 0), createIndex(31, 0), QVector<int>(Qt::DecorationRole));
+	}
+}
+
+
 TeletextDocument::TeletextDocument()
 {
 	m_pageNumber = 0x199;
@@ -36,10 +70,15 @@ TeletextDocument::TeletextDocument()
 	m_cursorColumn = 0;
 	m_selectionCornerRow = m_selectionCornerColumn = -1;
 	m_selectionSubPage = nullptr;
+
+	m_clutModel = new ClutModel;
+	m_clutModel->setSubPage(m_subPages[0]);
 }
 
 TeletextDocument::~TeletextDocument()
 {
+	delete m_clutModel;
+
 	for (auto &subPage : m_subPages)
 		delete(subPage);
 	for (auto &recycleSubPage : m_recycleSubPages)
@@ -72,7 +111,10 @@ void TeletextDocument::selectSubPageIndex(int newSubPageIndex, bool forceRefresh
 	// forceRefresh overrides "beyond the last subpage" check, so inserting a subpage after the last one still shows - dangerous workaround?
 	if (forceRefresh || (newSubPageIndex != m_currentSubPageIndex && newSubPageIndex < m_subPages.size())) {
 		emit aboutToChangeSubPage();
+
 		m_currentSubPageIndex = newSubPageIndex;
+
+		m_clutModel->setSubPage(m_subPages[m_currentSubPageIndex]);
 		emit subPageSelected();
 		emit selectionMoved();
 		return;
@@ -83,7 +125,10 @@ void TeletextDocument::selectSubPageNext()
 {
 	if (m_currentSubPageIndex < m_subPages.size()-1) {
 		emit aboutToChangeSubPage();
+
 		m_currentSubPageIndex++;
+
+		m_clutModel->setSubPage(m_subPages[m_currentSubPageIndex]);
 		emit subPageSelected();
 		emit selectionMoved();
 	}
@@ -93,7 +138,10 @@ void TeletextDocument::selectSubPagePrevious()
 {
 	if (m_currentSubPageIndex > 0) {
 		emit aboutToChangeSubPage();
+
 		m_currentSubPageIndex--;
+
+		m_clutModel->setSubPage(m_subPages[m_currentSubPageIndex]);
 		emit subPageSelected();
 		emit selectionMoved();
 	}
@@ -116,6 +164,8 @@ void TeletextDocument::insertSubPage(int beforeSubPageIndex, bool copySubPage)
 
 void TeletextDocument::deleteSubPage(int subPageToDelete)
 {
+	m_clutModel->setSubPage(nullptr);
+
 	delete(m_subPages[subPageToDelete]);
 	m_subPages.erase(m_subPages.begin()+subPageToDelete);
 }

document.h

@@ -20,11 +20,28 @@
 #ifndef DOCUMENT_H
 #define DOCUMENT_H
 
+#include <QAbstractListModel>
 #include <QObject>
 #include <QUndoStack>
 #include <vector>
+
 #include "levelonepage.h"
 
+class ClutModel : public QAbstractListModel
+{
+	Q_OBJECT
+
+public:
+	ClutModel(QObject *parent = 0);
+
+	int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+	QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+	void setSubPage(LevelOnePage *page);
+
+private:
+	LevelOnePage *m_subPage;
+};
+
 class TeletextDocument : public QObject
 {
 	Q_OBJECT
@@ -62,6 +79,7 @@ public:
 	void setDescription(QString);
 	void setFastTextLinkPageNumberOnAllSubPages(int, int);
 	QUndoStack *undoStack() const { return m_undoStack; }
+	ClutModel *clutModel() const { return m_clutModel; }
 	int cursorRow() const { return m_cursorRow; }
 	int cursorColumn() const { return m_cursorColumn; }
 	void cursorUp(bool shiftKey=false);
@@ -104,6 +122,7 @@ private:
 	QUndoStack *m_undoStack;
 	int m_cursorRow, m_cursorColumn, m_selectionCornerRow, m_selectionCornerColumn;
 	LevelOnePage *m_selectionSubPage;
+	ClutModel *m_clutModel;
 };
 
 #endif

levelonepage.cpp

@@ -37,11 +37,11 @@ LevelOnePage::LevelOnePage(const PageBase &other)
 	clearPage();
 
 	for (int i=0; i<26; i++)
-		if (other.packetNeeded(i))
+		if (other.packetExists(i))
 			setPacket(i, other.packet(i));
 	for (int i=26; i<30; i++)
 		for (int j=0; j<16; j++)
-			if (other.packetNeeded(i, j))
+			if (other.packetExists(i, j))
 				setPacket(i, j, other.packet(i));
 
 	for (int i=PageBase::C4ErasePage; i<=PageBase::C14NOS; i++)
@@ -254,7 +254,7 @@ bool LevelOnePage::setPacket(int packetNumber, int designationCode, QByteArray p
 	return PageBase::setPacket(packetNumber, designationCode, packetContents);
 }
 
-bool LevelOnePage::packetNeeded(int packetNumber) const
+bool LevelOnePage::packetExists(int packetNumber) const
 {
 	if (packetNumber <= 24) {
 		for (int c=0; c<40; c++)
@@ -263,10 +263,10 @@ bool LevelOnePage::packetNeeded(int packetNumber) const
 		return false;
 	}
 
-	return PageBase::packetNeeded(packetNumber);
+	return PageBase::packetExists(packetNumber);
 }
 
-bool LevelOnePage::packetNeeded(int packetNumber, int designationCode) const
+bool LevelOnePage::packetExists(int packetNumber, int designationCode) const
 {
 	if (packetNumber == 26)
 		return packetFromEnhancementListNeeded(designationCode);
@@ -298,7 +298,7 @@ bool LevelOnePage::packetNeeded(int packetNumber, int designationCode) const
 			return !isPaletteDefault(0,15);
 	}
 
-	return PageBase::packetNeeded(packetNumber, designationCode);
+	return PageBase::packetExists(packetNumber, designationCode);
 }
 
 bool LevelOnePage::controlBit(int bitNumber) const

levelonepage.h

@@ -42,8 +42,8 @@ public:
 
 	QByteArray packet(int) const override;
 	QByteArray packet(int, int) const override;
-	bool packetNeeded(int) const override;
+	bool packetExists(int) const override;
-	bool packetNeeded(int, int) const override;
+	bool packetExists(int, int) const override;
 	bool setPacket(int, QByteArray) override;
 	bool setPacket(int, int, QByteArray) override;
 

loadsave.cpp

@@ -182,7 +182,7 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 
 	auto write7bitPacket=[&](int packetNumber)
 	{
-		if (document.subPage(p)->packetNeeded(packetNumber)) {
+		if (document.subPage(p)->packetExists(packetNumber)) {
 			QByteArray outLine = document.subPage(p)->packet(packetNumber);
 
 			outStream << QString("OL,%1,").arg(packetNumber);
@@ -203,7 +203,7 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 
 	auto writeHammingPacket=[&](int packetNumber, int designationCode=0)
 	{
-		if (document.subPage(p)->packetNeeded(packetNumber, designationCode)) {
+		if (document.subPage(p)->packetExists(packetNumber, designationCode)) {
 			QByteArray outLine = document.subPage(p)->packet(packetNumber, designationCode);
 
 			outStream << QString("OL,%1,").arg(packetNumber);
@@ -279,7 +279,7 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 
 		// FastText links
 		bool writeFLCommand = false;
-		if (document.pageFunction() == TeletextDocument::PFLevelOnePage && document.subPage(p)->packetNeeded(27,0)) {
+		if (document.pageFunction() == TeletextDocument::PFLevelOnePage && document.subPage(p)->packetExists(27,0)) {
 			// Subpage has FastText links - if any link to a specific subpage, we need to write X/27/0 as raw
 			// otherwise we write the links as a human-readable FL command later on
 			writeFLCommand = true;
@@ -337,7 +337,7 @@ void saveTTI(QSaveFile &file, const TeletextDocument &document)
 
 QByteArray rowPacketAlways(PageBase *subPage, int packetNumber)
 {
-	if (subPage->packetNeeded(packetNumber))
+	if (subPage->packetExists(packetNumber))
 		return subPage->packet(packetNumber);
 	else
 		return QByteArray(40, ' ');
@@ -388,7 +388,7 @@ QString exportHashStringPackets(LevelOnePage *subPage)
 	const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
 	QString result;
 
-	if (subPage->packetNeeded(28,0) || subPage->packetNeeded(28,4)) {
+	if (subPage->packetExists(28,0) || subPage->packetExists(28,4)) {
 		// X/28/0 and X/28/4 are duplicates apart from the CLUT definitions
 		// Assemble the duplicate beginning and ending of both packets
 		QString x28StringBegin, x28StringEnd;
@@ -399,9 +399,9 @@ QString exportHashStringPackets(LevelOnePage *subPage)
 
 		x28StringEnd = QString("%1%2%3%4").arg(subPage->defaultScreenColour(), 2, 16, QChar('0')).arg(subPage->defaultRowColour(), 2, 16, QChar('0')).arg(subPage->blackBackgroundSubst(), 1, 10).arg(subPage->colourTableRemap(), 1, 10);
 
-		if (subPage->packetNeeded(28,0))
+		if (subPage->packetExists(28,0))
 			result.append(":X280=" + x28StringBegin + colourToHexString(2) + colourToHexString(3) + x28StringEnd);
-		if (subPage->packetNeeded(28,4))
+		if (subPage->packetExists(28,4))
 			result.append(":X284=" + x28StringBegin + colourToHexString(0) + colourToHexString(1) + x28StringEnd);
 	}
 

main.cpp

@@ -30,7 +30,7 @@ int main(int argc, char *argv[])
 	QApplication::setApplicationDisplayName(QApplication::applicationName());
 	QApplication::setOrganizationName("gkmac.co.uk");
 	QApplication::setOrganizationDomain("gkmac.co.uk");
-	QApplication::setApplicationVersion("0.2-alpha");
+	QApplication::setApplicationVersion("0.4-alpha");
 	QCommandLineParser parser;
 	parser.setApplicationDescription(QApplication::applicationName());
 	parser.addHelpOption();

mainwidget.cpp

@@ -140,6 +140,16 @@ void TeletextWidget::timerEvent(QTimerEvent *event)
 		QWidget::timerEvent(event);
 }
 
+void TeletextWidget::pauseFlash(bool pauseNow)
+{
+	if (pauseNow && m_flashTiming != 0) {
+		m_flashTimer.stop();
+		m_flashPhase = 0;
+		update();
+	} else if (m_flashTiming != 0)
+		m_flashTimer.start((m_flashTiming == 1) ? 500 : 167, this);
+}
+
 void TeletextWidget::setInsertMode(bool insertMode)
 {
 	m_insertMode = insertMode;
@@ -654,6 +664,24 @@ void LevelOneScene::toggleGrid(bool gridOn)
 			m_sidePanelGridItemGroup[i]->setVisible(gridOn);
 }
 
+void LevelOneScene::hideGUIElements(bool hidden)
+{
+	if (hidden) {
+		m_mainGridItemGroup->setVisible(false);
+		m_cursorRectItem->setVisible(false);
+		m_selectionRectItem->setVisible(false);
+		for (int i=0; i<32; i++)
+			if (m_sidePanelGridNeeded[i])
+				m_sidePanelGridItemGroup[i]->setVisible(false);
+	} else {
+		if (static_cast<TeletextWidget *>(m_levelOneProxyWidget->widget())->document()->selectionActive())
+			m_selectionRectItem->setVisible(true);
+
+		m_cursorRectItem->setVisible(true);
+		toggleGrid(m_grid);
+	}
+}
+
 bool LevelOneScene::eventFilter(QObject *object, QEvent *event)
 {
 	Q_UNUSED(object);

mainwidget.h

@@ -64,6 +64,7 @@ public slots:
 	void toggleReveal(bool);
 	void toggleMix(bool);
 	void updateFlashTimer(int);
+	void pauseFlash(bool);
 	void refreshRow(int);
 
 	void setControlBit(int, bool);
@@ -119,6 +120,7 @@ public slots:
 	void updateCursor();
 	void updateSelection();
 	void toggleGrid(bool);
+	void hideGUIElements(bool);
 	void setFullScreenColour(const QColor &);
 	void setFullRowColour(int, const QColor &);
 

mainwindow.cpp

@@ -20,9 +20,11 @@
 #include <QApplication>
 #include <QDesktopServices>
 #include <QFileDialog>
+#include <QImage>
 #include <QList>
 #include <QMenuBar>
 #include <QMessageBox>
+#include <QPainter>
 #include <QPushButton>
 #include <QRadioButton>
 #include <QSaveFile>
@@ -120,6 +122,56 @@ bool MainWindow::saveAs()
 	return saveFile(fileName);
 }
 
+void MainWindow::exportPNG()
+{
+	QString exportFileName = QFileDialog::getSaveFileName(this, tr("Export PNG"), QString(), "PNG image (*.png)");
+	if (exportFileName.isEmpty())
+		return;
+
+	// Prepare widget image for extraction
+	m_textWidget->pauseFlash(true);
+	m_textScene->hideGUIElements(true);
+	bool reshowCodes = m_textWidget->pageRender()->showCodes();
+	if (reshowCodes)
+		m_textWidget->pageRender()->setShowCodes(false);
+	// Disable exporting in Mix mode as it corrupts the background
+	bool reMix = m_textWidget->pageRender()->mix();
+	if (reMix)
+		m_textWidget->pageRender()->setMix(false);
+
+	// Extract the image from the scene
+	QImage interImage = QImage(m_textScene->sceneRect().size().toSize(), QImage::Format_RGB32);
+//	This ought to make the background transparent in Mix mode, but it doesn't
+//	if (m_textWidget->pageRender()->mix())
+//		interImage.fill(QColor(0, 0, 0, 0));
+	QPainter interPainter(&interImage);
+	m_textScene->render(&interPainter);
+
+	// Now we've extracted the image we can put the GUI things back
+	m_textScene->hideGUIElements(false);
+	if (reshowCodes)
+		m_textWidget->pageRender()->setShowCodes(true);
+	if (reMix)
+		m_textWidget->pageRender()->setMix(true);
+	m_textWidget->pauseFlash(false);
+
+	// Now scale the extracted image to the selected aspect ratio
+	// We do this in two steps so that anti-aliasing only occurs on vertical lines
+
+	// Double the vertical height first
+	const QImage doubleHeightImage = interImage.scaled(interImage.width(), interImage.height()*2, Qt::IgnoreAspectRatio, Qt::FastTransformation);
+
+	// If aspect ratio is Pixel 1:2 we're already at the correct scale
+	if (m_viewAspectRatio != 3) {
+		// Scale it horizontally to the selected aspect ratio
+		const QImage scaledImage = doubleHeightImage.scaled((int)((float)doubleHeightImage.width() * aspectRatioHorizontalScaling[m_viewAspectRatio] * 2), doubleHeightImage.height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+
+		if (!scaledImage.save(exportFileName, "PNG"))
+			QMessageBox::warning(this, tr("QTeletextMaker"), tr("Cannot export file %1.").arg(QDir::toNativeSeparators(exportFileName)));
+	} else if (!doubleHeightImage.save(exportFileName, "PNG"))
+		QMessageBox::warning(this, tr("QTeletextMaker"), tr("Cannot export file %1.").arg(QDir::toNativeSeparators(exportFileName)));
+}
+
 void MainWindow::exportZXNet()
 {
 	QDesktopServices::openUrl(QUrl("http://zxnet.co.uk/teletext/editor/" + exportHashStringPage(m_textWidget->document()->currentSubPage()) + exportHashStringPackets(m_textWidget->document()->currentSubPage())));
@@ -166,6 +218,7 @@ void MainWindow::init()
 
 	m_textView = new QGraphicsView(this);
 	m_textView->setScene(m_textScene);
+	if (m_viewSmoothTransform)
 		m_textView->setRenderHints(QPainter::SmoothPixmapTransform);
 	m_textView->setBackgroundBrush(QBrush(QColor(32, 48, 96)));
 	setSceneDimensions();
@@ -257,14 +310,18 @@ void MainWindow::createActions()
 
 	setRecentFilesVisible(MainWindow::hasRecentFiles());
 
-	QMenu *exportHashStringSubMenu = fileMenu->addMenu(tr("Export to online editor"));
+	QAction *exportPNGAct = fileMenu->addAction(tr("Export subpage as PNG..."));
+	exportPNGAct->setStatusTip("Export a PNG image of this subpage");
+	connect(exportPNGAct, &QAction::triggered, this, &MainWindow::exportPNG);
+
+	QMenu *exportHashStringSubMenu = fileMenu->addMenu(tr("Export subpage to online editor"));
 
 	QAction *exportZXNetAct = exportHashStringSubMenu->addAction(tr("Open in zxnet.co.uk"));
-	exportZXNetAct->setStatusTip("Export and open page in zxnet.co.uk online editor");
+	exportZXNetAct->setStatusTip("Export and open this subpage in the zxnet.co.uk online editor");
 	connect(exportZXNetAct, &QAction::triggered, this, &MainWindow::exportZXNet);
 
 	QAction *exportEditTFAct = exportHashStringSubMenu->addAction(tr("Open in edit.tf"));
-	exportEditTFAct->setStatusTip("Export and open page in edit.tf online editor");
+	exportEditTFAct->setStatusTip("Export and open this subpage in the edit.tf online editor");
 	connect(exportEditTFAct, &QAction::triggered, this, &MainWindow::exportEditTF);
 
 	fileMenu->addSeparator();
@@ -418,6 +475,13 @@ void MainWindow::createActions()
 		borderGroup->addAction(m_borderActs[i]);
 	}
 
+	viewMenu->addSeparator();
+
+	m_smoothTransformAction = viewMenu->addAction(tr("Smooth font scaling"));
+	m_smoothTransformAction->setCheckable(true);
+	m_smoothTransformAction->setStatusTip(tr("Toggle smooth font scaling"));
+	connect(m_smoothTransformAction, &QAction::toggled, this, &MainWindow::setSmoothTransform);
+
 	QAction *zoomInAct = viewMenu->addAction(tr("Zoom In"));
 	zoomInAct->setShortcuts(QKeySequence::ZoomIn);
 	zoomInAct->setStatusTip(tr("Zoom in"));
@@ -555,7 +619,6 @@ void MainWindow::createActions()
 
 void MainWindow::setSceneDimensions()
 {
-	const float aspectRatioHorizontalScaling[4] = { 0.6, 0.6, 0.8, 0.5 };
 	const int topBottomBorders[3] = { 0, 10, 19 };
 	const int pillarBoxSizes[3] = { 672, 720, 854 };
 	const int leftRightBorders[3] = { 0, 24, 77 };
@@ -612,6 +675,15 @@ void MainWindow::setAspectRatio(int newViewAspectRatio)
 	setSceneDimensions();
 }
 
+void MainWindow::setSmoothTransform(bool smoothTransform)
+{
+	m_viewSmoothTransform = smoothTransform;
+	if (smoothTransform)
+		m_textView->setRenderHints(QPainter::SmoothPixmapTransform);
+	else
+		m_textView->setRenderHints({ });
+}
+
 void MainWindow::zoomIn()
 {
 	if (m_viewZoom < 4)
@@ -705,6 +777,10 @@ void MainWindow::readSettings()
 	m_viewAspectRatio = settings.value("aspectratio", 0).toInt();
 	m_viewAspectRatio = (m_viewAspectRatio < 0 || m_viewAspectRatio > 2) ? 0 : m_viewAspectRatio;
 	m_aspectRatioActs[m_viewAspectRatio]->setChecked(true);
+	m_viewSmoothTransform = settings.value("smoothTransform", 0).toBool();
+	m_smoothTransformAction->blockSignals(true);
+	m_smoothTransformAction->setChecked(m_viewSmoothTransform);
+	m_smoothTransformAction->blockSignals(false);
 	m_viewZoom = settings.value("zoom", 2).toInt();
 	m_viewZoom = (m_viewZoom < 0 || m_viewZoom > 4) ? 2 : m_viewZoom;
 
@@ -743,6 +819,7 @@ void MainWindow::writeSettings()
 	settings.setValue("windowState", saveState());
 	settings.setValue("border", m_viewBorder);
 	settings.setValue("aspectratio", m_viewAspectRatio);
+	settings.setValue("smoothTransform", m_viewSmoothTransform);
 	settings.setValue("zoom", m_viewZoom);
 }
 

mainwindow.h

@@ -58,6 +58,7 @@ private slots:
 	void open();
 	bool save();
 	bool saveAs();
+	void exportPNG();
 	void exportZXNet();
 	void exportEditTF();
 	void updateRecentFileActions();
@@ -74,6 +75,7 @@ private slots:
 	void setSceneDimensions();
 	void setBorder(int);
 	void setAspectRatio(int);
+	void setSmoothTransform(bool);
 	void zoomIn();
 	void zoomOut();
 	void zoomReset();
@@ -82,6 +84,7 @@ private slots:
 
 private:
 	enum { m_MaxRecentFiles = 10 };
+	const float aspectRatioHorizontalScaling[4] = { 0.6, 0.6, 0.8, 0.5 };
 
 	void init();
 	void createActions();
@@ -104,6 +107,7 @@ private:
 	QGraphicsView *m_textView;
 
 	int m_viewBorder, m_viewAspectRatio, m_viewZoom;
+	bool m_viewSmoothTransform;
 	PageOptionsDockWidget *m_pageOptionsDockWidget;
 	PageEnhancementsDockWidget *m_pageEnhancementsDockWidget;
 	X26DockWidget *m_x26DockWidget;
@@ -115,6 +119,7 @@ private:
 	QAction *m_deleteSubPageAction;
 	QAction *m_borderActs[3];
 	QAction *m_aspectRatioActs[4];
+	QAction *m_smoothTransformAction;
 
 	QLabel *m_subPageLabel, *m_cursorPositionLabel;
 	QToolButton *m_previousSubPageButton, *m_nextSubPageButton;

pagebase.h

@@ -37,8 +37,8 @@ public:
 
 	virtual QByteArray packet(int) const;
 	virtual QByteArray packet(int, int) const;
-	virtual bool packetNeeded(int i) const { return m_displayPackets[i] != nullptr; }
+	virtual bool packetExists(int i) const { return m_displayPackets[i] != nullptr; }
-	virtual bool packetNeeded(int i, int j) const { return m_designationPackets[i-26][j] != nullptr; }
+	virtual bool packetExists(int i, int j) const { return m_designationPackets[i-26][j] != nullptr; }
 	virtual bool setPacket(int, QByteArray);
 	virtual bool setPacket(int, int, QByteArray);
 //	bool deletePacket(int);

pageenhancementsdockwidget.cpp

@@ -47,12 +47,9 @@ PageEnhancementsDockWidget::PageEnhancementsDockWidget(TeletextWidget *parent):
 	x28Layout->addWidget(new QLabel(tr("Default screen colour")), 0, 0, 1, 1);
 	x28Layout->addWidget(new QLabel(tr("Default row colour")), 1, 0, 1, 1);
 	m_defaultScreenColourCombo = new QComboBox;
+	m_defaultScreenColourCombo->setModel(m_parentMainWidget->document()->clutModel());
 	m_defaultRowColourCombo = new QComboBox;
-	for (int r=0; r<=3; r++)
+	m_defaultRowColourCombo->setModel(m_parentMainWidget->document()->clutModel());
-		for (int c=0; c<=7; c++) {
-			m_defaultScreenColourCombo->addItem(tr("CLUT %1:%2").arg(r).arg(c));
-			m_defaultRowColourCombo->addItem(tr("CLUT %1:%2").arg(r).arg(c));
-		}
 	x28Layout->addWidget(m_defaultScreenColourCombo, 0, 1, 1, 1, Qt::AlignTop);
 	connect(m_defaultScreenColourCombo, QOverload<int>::of(&QComboBox::currentIndexChanged), [=](int index){ m_parentMainWidget->setDefaultScreenColour(index); });
 	x28Layout->addWidget(m_defaultRowColourCombo, 1, 1, 1, 1, Qt::AlignTop);

pagex26base.cpp

@@ -74,7 +74,7 @@ void PageX26Base::setEnhancementListFromPacket(int packetNumber, QByteArray pack
 		newX26Triplet.setAddress(packetContents.at(i*3+1) & 0x3f);
 		newX26Triplet.setMode(packetContents.at(i*3+2) & 0x1f);
 		newX26Triplet.setData(((packetContents.at(i*3+3) & 0x3f) << 1) | ((packetContents.at(i*3+2) & 0x20) >> 5));
-		m_enhancements[enhanceListPointer] = newX26Triplet;
+		m_enhancements.replace(enhanceListPointer, newX26Triplet);
 	}
 	if (newX26Triplet.mode() == 0x1f && newX26Triplet.address() == 0x3f && newX26Triplet.data() & 0x01)
 		// Last triplet was a Termination Marker (without ..follows) so clean up the repeated ones

pagex26base.h

@@ -31,7 +31,7 @@ class PageX26Base : public PageBase //: public QObject
 	//Q_OBJECT
 
 public:
-	QList<X26Triplet> *enhancements() { return &m_enhancements; };
+	X26TripletList *enhancements() { return &m_enhancements; };
 	virtual int maxEnhancements() const =0;
 
 protected:
@@ -39,7 +39,7 @@ protected:
 	void setEnhancementListFromPacket(int, QByteArray);
 	bool packetFromEnhancementListNeeded(int n) const { return ((m_enhancements.size()+12) / 13) > n; };
 
-	QList<X26Triplet> m_enhancements;
+	X26TripletList m_enhancements;
 	const X26Triplet m_paddingX26Triplet { 41, 0x1e, 0 };
 };
 

render.cpp

@@ -26,11 +26,26 @@
 
 #include "render.h"
 
+int TeletextFontBitmap::s_instances = 0;
+
+QBitmap *TeletextFontBitmap::s_fontBitmap = nullptr;
+
+TeletextFontBitmap::TeletextFontBitmap()
+{
+	if (s_instances == 0)
+		s_fontBitmap = new QBitmap(":/images/teletextfont.png");
+	s_instances++;
+}
+
+TeletextFontBitmap::~TeletextFontBitmap()
+{
+	s_instances--;
+	if (s_instances == 0)
+		delete s_fontBitmap;
+}
+
 TeletextPageRender::TeletextPageRender()
 {
-	QPainter pixmapPainter;
-
-	m_fontBitmap = new QBitmap(":/images/teletextfont.png");
 	for (int i=0; i<6; i++)
 		m_pagePixmap[i] = new QPixmap(864, 250);
 	m_pagePixmap[0]->fill(Qt::transparent);
@@ -58,7 +73,6 @@ TeletextPageRender::~TeletextPageRender()
 	}
 	for (int i=0; i<6; i++)
 		delete m_pagePixmap[i];
-	delete m_fontBitmap;
 }
 
 void TeletextPageRender::setTeletextPage(LevelOnePage *newCurrentPage)
@@ -259,7 +273,7 @@ void TeletextPageRender::decodePage()
 		setFullRowColour(r ,downwardsFullRowColour);
 
 	m_textLayer[1]->enhanceMap.clear();
-	if (m_renderLevel == 0 || m_levelOnePage->enhancements()->empty())
+	if (m_renderLevel == 0 || m_levelOnePage->enhancements()->isEmpty())
 		return;
 
 	m_textLayer[1]->setFullScreenColour(-1);
@@ -348,10 +362,10 @@ void TeletextPageRender::renderPage(int r)
 				pixmapPainter.setBackground(QBrush(backQColour));
 			}
 			pixmapPainter.setPen(foreQColour);
-			pixmapPainter.drawPixmap(c*12, r*10, charWidth, charHeight, *m_fontBitmap, (resultCharacter.code-32)*12, resultCharacter.set*10, 12, 10);
+			pixmapPainter.drawPixmap(c*12, r*10, charWidth, charHeight, *m_fontBitmap.rawBitmap(), (resultCharacter.code-32)*12, resultCharacter.set*10, 12, 10);
 			if (resultCharacter.diacritical) {
 				pixmapPainter.setBackgroundMode(Qt::TransparentMode);
-				pixmapPainter.drawPixmap(c*12, r*10, charWidth, charHeight, *m_fontBitmap, 384+resultCharacter.diacritical*12, 70, 12, 10);
+				pixmapPainter.drawPixmap(c*12, r*10, charWidth, charHeight, *m_fontBitmap.rawBitmap(), 384+resultCharacter.diacritical*12, 70, 12, 10);
 				pixmapPainter.setBackgroundMode(Qt::OpaqueMode);
 			}
 		}
@@ -483,7 +497,7 @@ void TeletextPageRender::renderPage(int r)
 		if (m_showCodes && c < 40 && m_levelOnePage->character(r, c)<0x20 && !m_level1Layer.isRowBottomHalf(r) && !m_cell[r][c].bottomHalf) {
 			pixmapPainter.setBackground(QBrush(QColor(0, 0, 0, 128)));
 			pixmapPainter.setPen(QColor(255, 255, 255, 224));
-			pixmapPainter.drawPixmap(c*12, r*10, 12, 10, *m_fontBitmap, (m_levelOnePage->character(r, c)+32)*12, 250, 12, 10);
+			pixmapPainter.drawPixmap(c*12, r*10, 12, 10, *m_fontBitmap.rawBitmap(), (m_levelOnePage->character(r, c)+32)*12, 250, 12, 10);
 		}
 
 		if (resultAttributes.display.doubleHeight)

render.h

@@ -179,6 +179,18 @@ private:
 	enum rowHeightEnum { RHnormal=-1, RHtophalf, RHbottomhalf } m_rowHeight[25];
 };
 
+class TeletextFontBitmap
+{
+public:
+	TeletextFontBitmap();
+	~TeletextFontBitmap();
+	QBitmap *rawBitmap() const { return s_fontBitmap; }
+
+private:
+	static int s_instances;
+	static QBitmap* s_fontBitmap;
+};
+
 class TeletextPageRender : public QObject
 {
 	Q_OBJECT
@@ -189,6 +201,8 @@ public:
 	void decodePage();
 	void renderPage();
 	void renderPage(int r);
+	bool mix() const { return m_mix; };
+	bool showCodes() const { return m_showCodes; };
 	void setTeletextPage(LevelOnePage *);
 	void updateSidePanels();
 	void buildEnhanceMap(TextLayer *, int=0);
@@ -215,7 +229,7 @@ protected:
 	inline void setFullScreenColour(int);
 	inline void setFullRowColour(int, int);
 
-	QBitmap* m_fontBitmap;
+	TeletextFontBitmap m_fontBitmap;
 	QPixmap* m_pagePixmap[6];
 	int m_finalFullScreenColour, m_renderLevel;
 	QColor m_finalFullScreenQColor;

x26commands.cpp

@@ -164,7 +164,7 @@ void EditTripletCommand::redo()
 	if (m_teletextDocument->currentSubPageIndex() != m_subPageIndex)
 		m_teletextDocument->selectSubPageIndex(m_subPageIndex, true);
 
-	m_teletextDocument->currentSubPage()->enhancements()->operator[](m_row) = m_newTriplet;
+	m_teletextDocument->currentSubPage()->enhancements()->replace(m_row, m_newTriplet);
 	m_x26Model->emit dataChanged(m_x26Model->createIndex(m_row, 0), m_x26Model->createIndex(m_row, 3), {m_role});
 	m_teletextDocument->emit refreshNeeded();
 
@@ -179,7 +179,7 @@ void EditTripletCommand::undo()
 	if (m_teletextDocument->currentSubPageIndex() != m_subPageIndex)
 		m_teletextDocument->selectSubPageIndex(m_subPageIndex, true);
 
-	m_teletextDocument->currentSubPage()->enhancements()->operator[](m_row) = m_oldTriplet;
+	m_teletextDocument->currentSubPage()->enhancements()->replace(m_row, m_oldTriplet);
 	m_x26Model->emit dataChanged(m_x26Model->createIndex(m_row, 0), m_x26Model->createIndex(m_row, 3), {m_role});
 	m_teletextDocument->emit refreshNeeded();
 	m_teletextDocument->emit tripletCommandHighlight(m_row);

x26dockwidget.cpp

@@ -17,6 +17,7 @@
  * along with QTeletextMaker.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <QAbstractListModel>
 #include <QActionGroup>
 #include <QButtonGroup>
 #include <QCheckBox>
@@ -34,8 +35,42 @@
 #include <QToolButton>
 #include <QVBoxLayout>
 
+#include "render.h"
 #include "x26dockwidget.h"
 
+CharacterListModel::CharacterListModel(QObject *parent): QAbstractListModel(parent)
+{
+	m_characterSet = 0;
+}
+
+int CharacterListModel::rowCount(const QModelIndex & /*parent*/) const
+{
+	return 96;
+}
+
+QVariant CharacterListModel::data(const QModelIndex &index, int role) const
+{
+	if (!index.isValid())
+		return QVariant();
+
+	if (role == Qt::DisplayRole)
+		return QString("0x%1").arg(index.row()+0x20, 2, 16);
+
+	if (role == Qt::DecorationRole)
+		return m_fontBitmap.rawBitmap()->copy(index.row()*12, m_characterSet*10, 12, 10);
+
+	return QVariant();
+}
+
+void CharacterListModel::setCharacterSet(int characterSet)
+{
+	if (characterSet != m_characterSet) {
+		m_characterSet = characterSet;
+		emit dataChanged(createIndex(0, 0), createIndex(95, 0), QVector<int>(Qt::DecorationRole));
+	}
+}
+
+
 X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 {
 	QVBoxLayout *x26Layout = new QVBoxLayout;
@@ -161,9 +196,7 @@ X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 	QHBoxLayout *colourAndRowLayout = new QHBoxLayout;
 
 	m_colourComboBox = new QComboBox;
-	for (int c=0; c<=3; c++)
+	m_colourComboBox->setModel(m_parentMainWidget->document()->clutModel());
-		for (int e=0; e<=7; e++)
-			m_colourComboBox->addItem(tr("CLUT %1:%2").arg(c).arg(e));
 	colourAndRowLayout->addWidget(m_colourComboBox);
 	connect(m_colourComboBox, QOverload<int>::of(&QComboBox::activated), this, [=](const int value) { updateModelFromCookedWidget(value, Qt::UserRole+1); } );
 
@@ -181,8 +214,7 @@ X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 	QHBoxLayout *characterCodeLayout = new QHBoxLayout;
 
 	m_characterCodeComboBox = new QComboBox;
-	for (int i=32; i<128; i++)
+	m_characterCodeComboBox->setModel(&m_characterListModel);
-		m_characterCodeComboBox->addItem(QString("0x%1").arg(i, 2, 16), i);
 	characterCodeLayout->addWidget(m_characterCodeComboBox);
 	connect(m_characterCodeComboBox, QOverload<int>::of(&QComboBox::activated), this, [=](const int value) { updateModelFromCookedWidget(value+32, Qt::UserRole+1); } );
 
@@ -253,13 +285,15 @@ X26DockWidget::X26DockWidget(TeletextWidget *parent): QDockWidget(parent)
 	// Invoke Local Objects
 	QHBoxLayout *invokeLocalObjectLayout = new QHBoxLayout;
 
-	invokeLocalObjectLayout->addWidget(new QLabel(tr("Designation")));
+	m_invokeLocalObjectDesignationCodeLabel = new QLabel(tr("Designation"));
+	invokeLocalObjectLayout->addWidget(m_invokeLocalObjectDesignationCodeLabel);
 	m_invokeLocalObjectDesignationCodeSpinBox = new QSpinBox;
 	m_invokeLocalObjectDesignationCodeSpinBox->setMaximum(15);
 	invokeLocalObjectLayout->addWidget(m_invokeLocalObjectDesignationCodeSpinBox);
 	connect(m_invokeLocalObjectDesignationCodeSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, [=](const int value) { updateModelFromCookedWidget(value, Qt::UserRole+2); } );
 
-	invokeLocalObjectLayout->addWidget(new QLabel(tr("Triplet")));
+	m_invokeLocalObjectTripletNumberLabel = new QLabel(tr("Triplet"));
+	invokeLocalObjectLayout->addWidget(m_invokeLocalObjectTripletNumberLabel);
 	m_invokeLocalObjectTripletNumberSpinBox = new QSpinBox;
 	m_invokeLocalObjectTripletNumberSpinBox->setMaximum(12);
 	invokeLocalObjectLayout->addWidget(m_invokeLocalObjectTripletNumberSpinBox);
@@ -705,7 +739,16 @@ void X26DockWidget::updateCookedTripletParameters(const QModelIndex &index)
 		case 0x29: // G0 character
 		case 0x2b: // G3 character at Level 2.5
 		case 0x2f ... 0x3f: // G2 character, G0 character with diacritical
+			// TODO non-Latin G0 and G2 character sets
 			m_characterCodeComboBox->blockSignals(true);
+			if (modeExt == 0x22 || modeExt == 0x2b)
+				m_characterListModel.setCharacterSet(26);
+			else if (modeExt == 0x2f)
+				m_characterListModel.setCharacterSet(7);
+			else if (modeExt == 0x21)
+				m_characterListModel.setCharacterSet(24);
+			else
+				m_characterListModel.setCharacterSet(0);
 			m_characterCodeComboBox->setCurrentIndex(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+1).toInt()-32);
 			m_characterCodeComboBox->blockSignals(false);
 			m_tripletParameterStackedLayout->setCurrentIndex(2);
@@ -756,14 +799,22 @@ void X26DockWidget::updateCookedTripletParameters(const QModelIndex &index)
 			// BUG we're only dealing with Local Object Definitions at the moment!
 			if (index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+1).toInt() == 0 || (index.model()->data(index.model()->index(index.row(), 1), Qt::UserRole).toInt() & 0x04)) {
 //			if (triplet.objectSource() == X26Triplet::LocalObjectSource) {
+				const bool tripletLocationWidgetsVisible = (modeExt & 0x04) != 0x04;
+
+				m_invokeLocalObjectDesignationCodeLabel->setVisible(tripletLocationWidgetsVisible);
+				m_invokeLocalObjectDesignationCodeSpinBox->setVisible(tripletLocationWidgetsVisible);
+				m_invokeLocalObjectTripletNumberLabel->setVisible(tripletLocationWidgetsVisible);
+				m_invokeLocalObjectTripletNumberSpinBox->setVisible(tripletLocationWidgetsVisible);
 				m_objectSourceComboBox->setCurrentIndex(0);
 				m_invokeObjectSourceStackedLayout->setCurrentIndex(0);
+				if (tripletLocationWidgetsVisible) {
 					m_invokeLocalObjectDesignationCodeSpinBox->blockSignals(true);
 					m_invokeLocalObjectTripletNumberSpinBox->blockSignals(true);
 					m_invokeLocalObjectDesignationCodeSpinBox->setValue(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+2).toInt());
 					m_invokeLocalObjectTripletNumberSpinBox->setValue(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+3).toInt());
 					m_invokeLocalObjectDesignationCodeSpinBox->blockSignals(false);
 					m_invokeLocalObjectTripletNumberSpinBox->blockSignals(false);
+				}
 			} else { // if (triplet.objectSource() != X26Triplet::IllegalObjectSource) {
 				m_objectSourceComboBox->setCurrentIndex(index.model()->data(index.model()->index(index.row(), 0), Qt::UserRole+1).toInt());
 				m_invokeObjectSourceStackedLayout->setCurrentIndex(1);
@@ -849,28 +900,36 @@ void X26DockWidget::updateCookedTripletParameters(const QModelIndex &index)
 	// Now deal with cooked row and column spinboxes
 	m_cookedRowSpinBox->blockSignals(true);
 	m_cookedColumnSpinBox->blockSignals(true);
-	QVariant rowVariant = index.model()->data(index.model()->index(index.row(), 0), Qt::EditRole);
+	const QVariant rowVariant = index.model()->data(index.model()->index(index.row(), 0), Qt::EditRole);
 	if (rowVariant.isNull()) {
 		m_cookedRowSpinBox->setEnabled(false);
 		m_cookedRowSpinBox->setValue(0);
+		m_cookedRowSpinBox->setPrefix("");
 	} else {
 		m_cookedRowSpinBox->setEnabled(true);
-		if (index.model()->data(index.model()->index(index.row(), 2), Qt::EditRole) == 0x10)
+		if (modeExt == 0x10) {
 			m_cookedRowSpinBox->setRange(0, 23);
-		else
+			m_cookedRowSpinBox->setPrefix("+");
+		} else {
 			m_cookedRowSpinBox->setRange(1, 24);
+			m_cookedRowSpinBox->setPrefix("");
+		}
 		m_cookedRowSpinBox->setValue(rowVariant.toInt());
 	}
-	QVariant columnVariant = index.model()->data(index.model()->index(index.row(), 1), Qt::EditRole);
+	const QVariant columnVariant = index.model()->data(index.model()->index(index.row(), 1), Qt::EditRole);
 	if (columnVariant.isNull()) {
 		m_cookedColumnSpinBox->setEnabled(false);
 		m_cookedColumnSpinBox->setValue(0);
+		m_cookedColumnSpinBox->setPrefix("");
 	} else {
 		m_cookedColumnSpinBox->setEnabled(true);
-		if (index.model()->data(index.model()->index(index.row(), 2), Qt::EditRole) == 0x10)
+		if (modeExt == 0x10) {
 			m_cookedColumnSpinBox->setMaximum(71);
-		else
+			m_cookedColumnSpinBox->setPrefix("+");
+		} else {
 			m_cookedColumnSpinBox->setMaximum(39);
+			m_cookedColumnSpinBox->setPrefix("");
+		}
 		m_cookedColumnSpinBox->setValue(columnVariant.toInt());
 	}
 	m_cookedRowSpinBox->blockSignals(false);

x26dockwidget.h

@@ -20,10 +20,12 @@
 #ifndef X26DOCKWIDGET_H
 #define X26DOCKWIDGET_H
 
+#include <QAbstractListModel>
 #include <QCheckBox>
 #include <QComboBox>
 #include <QDockWidget>
 #include <QGroupBox>
+#include <QLabel>
 #include <QPushButton>
 #include <QRadioButton>
 #include <QSpinBox>
@@ -31,8 +33,25 @@
 #include <QTableView>
 
 #include "mainwidget.h"
+#include "render.h"
 #include "x26model.h"
 
+class CharacterListModel : public QAbstractListModel
+{
+	Q_OBJECT
+
+public:
+	CharacterListModel(QObject *parent = 0);
+
+	int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+	QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+	void setCharacterSet(int);
+
+private:
+	TeletextFontBitmap m_fontBitmap;
+	int m_characterSet;
+};
+
 class X26DockWidget : public QDockWidget
 {
 	Q_OBJECT
@@ -63,6 +82,7 @@ public slots:
 
 protected:
 	void keyPressEvent(QKeyEvent *event) override;
+	CharacterListModel m_characterListModel;
 
 private:
 	QTableView *m_x26View;
@@ -79,6 +99,7 @@ private:
 	QComboBox *m_textSizeComboBox;
 	QCheckBox *m_displayAttributeBoxingCheckBox, *m_displayAttributeConcealCheckBox, *m_displayAttributeInvertCheckBox, *m_displayAttributeUnderlineCheckBox;
 	QComboBox *m_objectSourceComboBox, *m_objectRequiredAtLevelsComboBox;
+	QLabel *m_invokeLocalObjectDesignationCodeLabel, *m_invokeLocalObjectTripletNumberLabel;
 	QSpinBox *m_invokeLocalObjectDesignationCodeSpinBox, *m_invokeLocalObjectTripletNumberSpinBox;
 	QSpinBox *m_invokePOPSubPageSpinBox, *m_invokePOPPacketNumberSpinBox;
 	QComboBox *m_invokePOPTripletNumberComboBox, *m_invokePOPPointerBitsComboBox;

x26model.h

@@ -22,6 +22,7 @@
 
 #include <QAbstractListModel>
 #include "mainwidget.h"
+#include "render.h"
 
 class X26Model : public QAbstractListModel
 {
@@ -49,9 +50,9 @@ public:
 private:
 	TeletextWidget *m_parentMainWidget;
 	bool m_listLoaded;
-};
+	TeletextFontBitmap m_fontBitmap;
 
-static const QString modeTripletName[64] {
+	const QString m_modeTripletName[64] {
 		// Row triplet modes
 		"Full screen colour",
 		"Full row colour",
@@ -130,6 +131,18 @@ static const QString modeTripletName[64] {
 		"G0 character diacritical D",
 		"G0 character diacritical E",
 		"G0 character diacritical F"
+	};
+
+	struct tripletErrorShow {
+		QString message;
+		int columnHighlight;
+	};
+
+	const tripletErrorShow m_tripletErrors[3] {
+		{ "", 0 }, // No error
+		{ "Active Position can't move up", 0 },
+		{ "Active Position can't move left within row", 1 }
+	};
 };
 
 #endif

x26triplets.cpp

@@ -50,3 +50,126 @@ void X26Triplet::setAddressColumn(int addressColumn)
 {
 	m_address = addressColumn;
 }
+
+
+void X26TripletList::updateInternalData(int r)
+{
+	ActivePosition activePosition;
+	X26Triplet *triplet;
+
+	if (r != 0) {
+		activePosition.setRow(m_list[r-1].m_activePositionRow);
+		activePosition.setColumn(m_list[r-1].m_activePositionColumn);
+	}
+
+	for (int i = r; i < m_list.size(); i++) {
+		triplet = &m_list[i];
+		triplet->m_error = X26Triplet::NoError;
+		if (triplet->isRowTriplet()) {
+			switch (m_list.at(i).modeExt()) {
+				case 0x00: // Full screen colour
+					if (activePosition.isDeployed())
+						// TODO more specific error needed
+						triplet->m_error = X26Triplet::ActivePositionMovedUp;
+					break;
+				case 0x01: // Full row colour
+					if (!activePosition.setRow(triplet->addressRow()))
+						triplet->m_error = X26Triplet::ActivePositionMovedUp;
+					break;
+				case 0x04: // Set Active Position;
+					if (!activePosition.setRow(triplet->addressRow()))
+						triplet->m_error = X26Triplet::ActivePositionMovedUp;
+					else if (triplet->data() >= 40 || !activePosition.setColumn(triplet->data()))
+						triplet->m_error = X26Triplet::ActivePositionMovedLeft;
+					break;
+				case 0x07: // Address row 0
+					if (activePosition.isDeployed())
+						triplet->m_error = X26Triplet::ActivePositionMovedUp;
+					else {
+						activePosition.setRow(0);
+						activePosition.setColumn(8);
+					}
+					break;
+				case 0x15 ... 0x17: // Define Object
+					activePosition.reset();
+					// Make sure data field holds correct place of triplet
+					// otherwise the object won't appear
+					triplet->m_address &= 0x3c;
+					if (i >= 104) // Triplet 8
+						triplet->m_address |= 0x01;
+					triplet->m_data = (((i / 13) & 0x07) << 4) | (i % 13);
+					break;
+			};
+		// Column triplet: make sure that PDC and reserved triplets don't affect the Active Position
+		} else if (triplet->modeExt() != 0x24 && triplet->modeExt() != 0x25 && triplet->modeExt() != 0x26 && triplet->modeExt() != 0x2a)
+			if (!activePosition.setColumn(triplet->addressColumn()))
+				triplet->m_error = X26Triplet::ActivePositionMovedLeft;
+		triplet->m_activePositionRow = activePosition.row();
+		triplet->m_activePositionColumn = activePosition.column();
+	}
+}
+
+void X26TripletList::append(const X26Triplet &value)
+{
+	m_list.append(value);
+	updateInternalData(m_list.size()-1);
+}
+
+void X26TripletList::insert(int i, const X26Triplet &value)
+{
+	m_list.insert(i, value);
+	updateInternalData(i);
+}
+
+void X26TripletList::removeAt(int i)
+{
+	m_list.removeAt(i);
+	if (m_list.size() != 0 && i < m_list.size())
+		updateInternalData(i);
+}
+
+void X26TripletList::replace(int i, const X26Triplet &value)
+{
+	m_list.replace(i, value);
+	updateInternalData(i);
+}
+
+
+X26TripletList::ActivePosition::ActivePosition()
+{
+	m_row = m_column = -1;
+}
+
+void X26TripletList::ActivePosition::reset()
+{
+	m_row = m_column = -1;
+}
+
+bool X26TripletList::ActivePosition::setRow(int row)
+{
+	if (row < m_row)
+		return false;
+	if (row > m_row) {
+		m_row = row;
+		m_column = -1;
+	}
+	return true;
+}
+
+bool X26TripletList::ActivePosition::setColumn(int column)
+{
+	if (column < m_column)
+		return false;
+	if (m_row == -1 and column >= 0)
+		m_row = 0;
+	m_column = column;
+	return true;
+}
+/*
+bool X26TripletList::ActivePosition::setRowAndColumn(int newRow, int newColumn)
+{
+	if (!setRow(newRow))
+		return false;
+	return setColumn(newColumn);
+}
+*/

x26triplets.h

@@ -20,9 +20,13 @@
 #ifndef X26TRIPLETS_H
 #define X26TRIPLETS_H
 
+#include <QList>
+
 class X26Triplet
 {
 public:
+	enum X26TripletError { NoError, ActivePositionMovedUp, ActivePositionMovedLeft };
+
 	X26Triplet() {}
 //	X26Triplet(const X26Triplet &other);
 
@@ -44,9 +48,56 @@ public:
 	void setAddressRow(int);
 	void setAddressColumn(int);
 
+	int activePositionRow() const { return m_activePositionRow; }
+	int activePositionColumn() const { return m_activePositionColumn; }
+	X26TripletError error() const { return m_error; }
+
+	friend class X26TripletList;
+
 private:
 	int m_address, m_mode, m_data;
+	int m_activePositionRow = -1;
+	int m_activePositionColumn = -1;
+	X26TripletError m_error = NoError;
+};
 
+class X26TripletList
+{
+public:
+	void append(const X26Triplet &);
+	void insert(int, const X26Triplet &);
+	void removeAt(int);
+	void replace(int, const X26Triplet &);
+
+	void removeLast() { m_list.removeLast(); }
+
+	const X26Triplet &at(int i) const { return m_list.at(i); }
+	bool isEmpty() const { return m_list.isEmpty(); }
+	void reserve(int alloc) { m_list.reserve(alloc); }
+	int size() const { return m_list.size(); }
+
+private:
+	void updateInternalData(int);
+
+	QList<X26Triplet> m_list;
+
+	class ActivePosition
+	{
+	public:
+		ActivePosition();
+		void reset();
+//		int row() const { return (m_row == -1) ? 0 : m_row; }
+//		int column() const { return (m_column == -1) ? 0 : m_column; }
+		int row() const { return m_row; }
+		int column() const { return m_column; }
+		bool isDeployed() const { return m_row != -1; }
+		bool setRow(int);
+		bool setColumn(int);
+//		bool setRowAndColumn(int, int);
+
+	private:
+		int m_row, m_column;
+	};
 };
 
 #endif