From b7ef6508a402a551b4d4c03199ad1e4299f05467 Mon Sep 17 00:00:00 2001
From: octaeder <102688820+octaeder@users.noreply.github.com>
Date: Thu, 13 Jul 2023 20:05:32 +0200
Subject: [PATCH] scale tooltip preview, size limit in config

---
 src/configmanager.cpp        |  1 +
 src/latexeditorview_config.h |  1 +
 src/texstudio.cpp            | 16 +++++++++++++++-
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/configmanager.cpp b/src/configmanager.cpp
index 523bb56a9d..7f488a9872 100644
--- a/src/configmanager.cpp
+++ b/src/configmanager.cpp
@@ -551,6 +551,7 @@ 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);
diff --git a/src/latexeditorview_config.h b/src/latexeditorview_config.h
index daa88211cb..f2570ec4fc 100644
--- a/src/latexeditorview_config.h
+++ b/src/latexeditorview_config.h
@@ -43,6 +43,7 @@ class LatexEditorViewConfig
 	bool toolTipPreview;
 	bool toolTipHelp;
 	bool imageToolTip;
+	int imageToolTipLoadMaxPixels;
 	int maxImageTooltipWidth;
 	bool texdocHelpInInternalViewer;
 	bool monitorFilesForExternalChanges;
diff --git a/src/texstudio.cpp b/src/texstudio.cpp
index 50fb29a35c..7180d23f6f 100644
--- a/src/texstudio.cpp
+++ b/src/texstudio.cpp
@@ -71,6 +71,7 @@
 #include "execprogram.h"
 #include <QTime>
 
+#include <QImageReader>
 #include <QScreen>
 
 #ifndef QT_NO_DEBUG
@@ -8869,15 +8870,28 @@ 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();
 		}
 	}