Method imageFromDVI

src/tools/TeXRenderer.cpp:255–335

TEX -> DVI -> PS -> PNG

// TEX -> DVI -> PS -> PNG
QByteArray TeXRenderer::imageFromDVI(const QTemporaryFile& file, const int dpi, Result* res) {
	QFileInfo fi(file.fileName());
	const QString& baseName = fi.completeBaseName();

	if (!executeLatexProcess(QLatin1String("latex"), baseName, file, QStringLiteral("dvi"), res))
		return {};

	// dvips: DVI -> PS
	const QString dvipsFullPath = safeExecutableName(QStringLiteral("dvips"));
	if (dvipsFullPath.isEmpty()) {
		res->successful = false;
		res->errorMessage = i18n("dvips not found");
		WARN("dvips not found");
		return {};
	}
	QProcess dvipsProcess;
	startHostProcess(dvipsProcess, dvipsFullPath, QStringList() << QStringLiteral("-E") << baseName);
	if (!dvipsProcess.waitForFinished() || dvipsProcess.exitCode() != 0) {
		QString err = i18n("dvips process failed, exit code =") + QStringLiteral(" ") + QString::number(dvipsProcess.exitCode());
		WARN(err.toStdString());
		res->successful = false;
		res->errorMessage = std::move(err);
		QFile::remove(baseName + QStringLiteral(".aux"));
		QFile::remove(baseName + QStringLiteral(".log"));
		QFile::remove(baseName + QStringLiteral(".dvi"));
		return {};
	}

	// convert: PS -> PNG
	QProcess convertProcess;
#if defined(HAVE_WINDOWS)
	// need to set path to magick coder modules (which are in the labplot directory)
	auto env = QProcessEnvironment::systemEnvironment();
	env.insert(QStringLiteral("MAGICK_CODER_MODULE_PATH"), QString::fromLocal8Bit(qgetenv("PROGRAMFILES")) + QStringLiteral("\\labplot"));
	convertProcess.setProcessEnvironment(env);
#endif
	const QString convertFullPath = safeExecutableName(QStringLiteral("convert"));
	if (convertFullPath.isEmpty()) {
		WARN("convert not found");
		res->successful = false;
		res->errorMessage = i18n("convert not found");
		return {};
	}

	const QStringList params{QStringLiteral("-density"), QString::number(dpi), baseName + QStringLiteral(".ps"), baseName + QStringLiteral(".pdf")};
	startHostProcess(convertProcess, convertFullPath, params);

	if (!convertProcess.waitForFinished() || convertProcess.exitCode() != 0) {
		QString err = i18n("convert process failed, exit code =") + QStringLiteral(" ") + QString::number(convertProcess.exitCode());
		WARN(err.toStdString());
		res->successful = false;
		res->errorMessage = std::move(err);
		QFile::remove(baseName + QStringLiteral(".aux"));
		QFile::remove(baseName + QStringLiteral(".log"));
		QFile::remove(baseName + QStringLiteral(".dvi"));
		QFile::remove(baseName + QStringLiteral(".ps"));
		return {};
	}