scale tooltip preview, size limit in config

Author: octaeder

src/configmanager.cpp

@@ -546,6 +546,7 @@ ConfigManager::ConfigManager(QObject *parent): QObject (parent),
 	registerOption("Editor/ToolTip Help", &editorConfig->toolTipHelp, true, &pseudoDialog->checkBoxToolTipHelp2);
 	registerOption("Editor/ToolTip Preview", &editorConfig->toolTipPreview, true, &pseudoDialog->checkBoxToolTipPreview);
 	registerOption("Editor/ImageToolTip", &editorConfig->imageToolTip, true, &pseudoDialog->checkBoxImageToolTip);
+	registerOption("Editor/ImageToolTipLoadMaxPixels", &editorConfig->imageToolTipLoadMaxPixels, 30);
 	registerOption("Editor/MaxImageTooltipWidth", &editorConfig->maxImageTooltipWidth, 400);
 	registerOption("Editor/ContextMenuKeyboardModifiers", &editorConfig->contextMenuKeyboardModifiers, Qt::ShiftModifier);
 	registerOption("Editor/ContextMenuSpellcheckingEntryLocation", &editorConfig->contextMenuSpellcheckingEntryLocation, 0, &pseudoDialog->comboBoxContextMenuSpellcheckingEntryLocation);

src/latexeditorview_config.h

@@ -43,6 +43,7 @@ class LatexEditorViewConfig
 	bool toolTipPreview;
 	bool toolTipHelp;
 	bool imageToolTip;
+	int imageToolTipLoadMaxPixels;
 	int maxImageTooltipWidth;
 	bool texdocHelpInInternalViewer;
 	bool monitorFilesForExternalChanges;

src/texstudio.cpp

@@ -71,6 +71,7 @@
 #include "execprogram.h"
 #include <QTime>
 
+#include <QImageReader>
 #include <QScreen>
 
 #ifndef QT_NO_DEBUG
@@ -8682,15 +8683,28 @@ void Texstudio::showImgPreview(const QString &fname)
 		//else
 		//    p=currentEditorView()->editor->mapToGlobal(currentEditorView()->editor->mapFromContents(currentEditorView()->editor->cursor().documentPosition()));
 		QRect screen = QGuiApplication::primaryScreen()->geometry();
+#if QT_VERSION < QT_VERSION_CHECK(6,0,0)
 		QPixmap img(imageName);
 		int w = qMin(img.width(), configManager.editorConfig->maxImageTooltipWidth);
 		w = qMin(w, screen.width() - 8);
+#else
+		QImage img;
+		QImageReader reader(imageName);
+		reader.setAllocationLimit(4*configManager.editorConfig->imageToolTipLoadMaxPixels); // each pixel uses 4bytes
+		reader.read(&img);
+		int w = 0;
+		if (img != QImage()) {
+			int realw = qRound(img.width() * QGuiApplication::primaryScreen()->physicalDotsPerInch() / (img.dotsPerMeterX() * 2.54/100) );
+			w = qMin(realw, configManager.editorConfig->maxImageTooltipWidth);
+			w = qMin(w, screen.width() - 8);
+		}
+#endif
 		QString text = QString("<img src=\"" + imageName + "\" width=%1 />").arg(w);
 		if (completerPreview) {
 			completerPreview = false;
 			emit imgPreview(text);
 		} else {
-		        QToolTip::showText(p, text, nullptr);
+			QToolTip::showText(p, text, nullptr);
 			LatexEditorView::hideTooltipWhenLeavingLine = currentEditorView()->editor->cursor().lineNumber();
 		}
 	}