⚡ Improve the image loading performance in the database https://github.com/siyuan-note/siyuan/issues/15245

kernel/model/assets.go

@@ -37,6 +37,7 @@ import (
 	"github.com/88250/lute/editor"
 	"github.com/88250/lute/html"
 	"github.com/88250/lute/parse"
+	"github.com/disintegration/imaging"
 	"github.com/gabriel-vasile/mimetype"
 	"github.com/siyuan-note/filelock"
 	"github.com/siyuan-note/httpclient"
@@ -50,6 +51,74 @@ import (
 	"github.com/siyuan-note/siyuan/kernel/util"
 )
 
+func HandleAssetsRemoveEvent(assetAbsPath string) {
+	removeIndexAssetContent(assetAbsPath)
+	removeAssetThumbnail(assetAbsPath)
+}
+
+func HandleAssetsChangeEvent(assetAbsPath string) {
+	indexAssetContent(assetAbsPath)
+	removeAssetThumbnail(assetAbsPath)
+}
+
+func removeAssetThumbnail(assetAbsPath string) {
+	if util.IsCompressibleAssetImage(assetAbsPath) {
+		p := filepath.ToSlash(assetAbsPath)
+		idx := strings.Index(p, "assets/")
+		if -1 == idx {
+			return
+		}
+		thumbnailPath := filepath.Join(util.TempDir, "thumbnails", "assets", p[idx+7:])
+		os.RemoveAll(thumbnailPath)
+	}
+}
+
+func NeedGenerateAssetsThumbnail(sourceImgPath string) bool {
+	info, err := os.Stat(sourceImgPath)
+	if err != nil {
+		return false
+	}
+	if info.IsDir() {
+		return false
+	}
+	return info.Size() > 1024*10
+}
+
+func GenerateAssetsThumbnail(sourceImgPath, resizedImgPath string) (err error) {
+	start := time.Now()
+	img, err := imaging.Open(sourceImgPath)
+	if err != nil {
+		return
+	}
+
+	// 获取原图宽高
+	originalWidth := img.Bounds().Dx()
+	originalHeight := img.Bounds().Dy()
+
+	// 固定最大宽度为 520，计算缩放比例
+	maxWidth := 520
+	scale := float64(maxWidth) / float64(originalWidth)
+
+	// 按比例计算新的宽高
+	newWidth := maxWidth
+	newHeight := int(float64(originalHeight) * scale)
+
+	// 缩放图片
+	resizedImg := imaging.Resize(img, newWidth, newHeight, imaging.Lanczos)
+
+	// 保存缩放后的图片
+	err = os.MkdirAll(filepath.Dir(resizedImgPath), 0755)
+	if err != nil {
+		return
+	}
+	err = imaging.Save(resizedImg, resizedImgPath)
+	if err != nil {
+		return
+	}
+	logging.LogDebugf("generated thumbnail image [%s] to [%s], cost [%d]ms", sourceImgPath, resizedImgPath, time.Since(start).Milliseconds())
+	return
+}
+
 func DocImageAssets(rootID string) (ret []string, err error) {
 	tree, err := LoadTreeByBlockID(rootID)
 	if err != nil {