fix image issue

1. Do not judge the image format from the file suffix;
2. Enable file: scheme in Markdown-it;

src/dialog/vinsertimagedialog.cpp

@@ -243,21 +243,20 @@ void VInsertImageDialog::handlePathEditChanged()
         return;
     }
 
-    QImage image(text);
-    if (image.isNull()) {
+    QImage image;
+    if (url.isLocalFile()) {
+        image = VUtils::imageFromFile(url.toLocalFile());
+        setImage(image);
+        m_imageType = ImageType::LocalFile;
+        qDebug() << "fetch local file image to insert" << text;
+    } else {
         setImage(QImage());
-        // Try to treat it as network image.
         m_imageType = ImageType::ImageData;
         VDownloader *downloader = new VDownloader(this);
         connect(downloader, &VDownloader::downloadFinished,
                 this, &VInsertImageDialog::imageDownloaded);
         downloader->download(url.toString());
         qDebug() << "try to fetch network image to insert" << text;
-    } else {
-        // Local image path.
-        setImage(image);
-        m_imageType = ImageType::LocalFile;
-        qDebug() << "fetch local file image to insert" << text;
     }
 
     handleInputChanged();

src/resources/markdown-it.js

@@ -72,6 +72,14 @@ mdit = mdit.use(window.markdownitHeadingAnchor, {
     }
 });
 
+// Enable file: scheme.
+var validateLinkMDIT = mdit.validateLink;
+var fileSchemeRE = /^file:/;
+mdit.validateLink = function(url) {
+    var str = url.trim().toLowerCase();
+    return fileSchemeRE.test(str) ? true : validateLinkMDIT(url);
+};
+
 mdit = mdit.use(window.markdownitTaskLists);
 
 if (VMarkdownitOption.sub) {

src/utils/vutils.cpp

@@ -1476,3 +1476,31 @@ const QTreeWidgetItem *VUtils::topLevelTreeItem(const QTreeWidgetItem *p_item)
         return p_item;
     }
 }
+
+QImage VUtils::imageFromFile(const QString &p_filePath)
+{
+    QImage img;
+    QFile file(p_filePath);
+    if (!file.open(QIODevice::ReadOnly)) {
+        qWarning() << "fail to open image file" << p_filePath;
+        return img;
+    }
+
+    img.loadFromData(file.readAll());
+    qDebug() << "imageFromFile" << p_filePath << img.isNull() << img.format();
+    return img;
+}
+
+QPixmap VUtils::pixmapFromFile(const QString &p_filePath)
+{
+    QPixmap pixmap;
+    QFile file(p_filePath);
+    if (!file.open(QIODevice::ReadOnly)) {
+        qWarning() << "fail to open pixmap file" << p_filePath;
+        return pixmap;
+    }
+
+    pixmap.loadFromData(file.readAll());
+    qDebug() << "pixmapFromFile" << p_filePath << pixmap.isNull();
+    return pixmap;
+}

src/utils/vutils.h

@@ -320,6 +320,13 @@ public:
 
     static const QTreeWidgetItem *topLevelTreeItem(const QTreeWidgetItem *p_item);
 
+    // Read QImage from local file @p_filePath.
+    // Directly calling QImage(p_filePath) will judge the image format from the suffix,
+    // resulting a null image in wrong suffix case.
+    static QImage imageFromFile(const QString &p_filePath);
+
+    static QPixmap pixmapFromFile(const QString &p_filePath);
+
     // Regular expression for image link.
     // ![image title]( http://github.com/tamlok/vnote.jpg "alt \" text" )
     // Captured texts (need to be trimmed):

src/vmdeditoperations.cpp

@@ -148,12 +148,12 @@ bool VMdEditOperations::insertImageFromURL(const QUrl &imageUrl)
     // Whether it is a local file or web URL
     if (isLocal) {
         imagePath = imageUrl.toLocalFile();
-        image = QImage(imagePath);
-
+        image = VUtils::imageFromFile(imagePath);
         if (image.isNull()) {
-            qWarning() << "image is null";
+            qWarning() << "inserted image is null" << imagePath;
             return false;
         }
+
         title = "Insert Image From File";
     } else {
         imagePath = imageUrl.toString();

src/vpreviewmanager.cpp

@@ -222,7 +222,11 @@ QString VPreviewManager::fetchImagePathToPreview(const QString &p_text, QString
             }
         } else {
             QUrl url(p_url);
-            imagePath = url.toString();
+            if (url.isLocalFile()) {
+                imagePath = url.toLocalFile();
+            } else {
+                imagePath = url.toString();
+            }
         }
     }
 
@@ -238,12 +242,11 @@ QString VPreviewManager::imageResourceName(const ImageLinkInfo &p_link)
     }
 
     // Add it to the resource.
-    QString imgPath = p_link.m_linkUrl;
-    QFileInfo info(imgPath);
     QPixmap image;
-    if (info.exists()) {
+    QString imgPath = p_link.m_linkUrl;
+    if (QFileInfo::exists(imgPath)) {
         // Local file.
-        image = QPixmap(imgPath);
+        image = VUtils::pixmapFromFile(imgPath);
     } else {
         // URL. Try to download it.
         m_downloader->download(imgPath);

src/vwebview.cpp

@@ -16,6 +16,7 @@
 #include "utils/viconutils.h"
 #include "vconfigmanager.h"
 #include "utils/vwebutils.h"
+#include "utils/vutils.h"
 
 extern VConfigManager *g_config;
 
@@ -139,7 +140,7 @@ void VWebView::copyImage()
         }
 
         if (!imgPath.isEmpty()) {
-            QImage img(imgPath);
+            QImage img = VUtils::imageFromFile(imgPath);
             if (!img.isNull()) {
                 m_afterCopyImage = false;
                 VClipboardUtils::setImageToClipboard(clipboard, img, QClipboard::Clipboard);