feat: server thumbnail (#818)

* feat: add get_group_member_user_id api * feat: add SendBusinessNotification api * feat: add GetFriendIDs api * update pkg * feat: cos oss thumbnail * feat: cos video snapshot * feat: oss video snapshot * feat: minio video snapshot * feat: minio video snapshot * feat: minio * feat: minio * feat: minio * feat: s3 AccessURL * feat: s3 AccessURL * fix: Minio AccessURL * fix: Minio AccessURL * fix: optimize thumbnails * fix: optimize thumbnails * fix: cos option * fix: cos option * fix: cos option * docs: config * docs: config * minio: preview image cache * minio: preview image cache * minio: preview image cache * go mod tidy * cicd: robot automated Change Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> --------- Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: withchao <withchao@users.noreply.github.com>
2026-05-06 01:55:58 +08:00 · 2023-08-08 16:40:07 +08:00
parent bd518365ea
commit e706620f12
18 changed files with 500 additions and 225 deletions
@@ -0,0 +1,106 @@
+package minio
+
+import (
+	"image"
+	_ "image/gif"
+	_ "image/jpeg"
+	_ "image/png"
+	"io"
+
+	_ "golang.org/x/image/bmp"
+	_ "golang.org/x/image/tiff"
+	_ "golang.org/x/image/webp"
+)
+
+const (
+	formatPng  = "png"
+	formatJpeg = "jpeg"
+	formatJpg  = "jpg"
+	formatGif  = "gif"
+)
+
+func ImageStat(reader io.Reader) (image.Image, string, error) {
+	return image.Decode(reader)
+}
+
+func ImageWidthHeight(img image.Image) (int, int) {
+	bounds := img.Bounds().Max
+	return bounds.X, bounds.Y
+}
+
+func resizeImage(img image.Image, maxWidth, maxHeight int) image.Image {
+	bounds := img.Bounds()
+	imgWidth := bounds.Max.X
+	imgHeight := bounds.Max.Y
+
+	// 计算缩放比例
+	scaleWidth := float64(maxWidth) / float64(imgWidth)
+	scaleHeight := float64(maxHeight) / float64(imgHeight)
+
+	// 如果都为0，则不缩放，返回原始图片
+	if maxWidth == 0 && maxHeight == 0 {
+		return img
+	}
+
+	// 如果宽度和高度都大于0，则选择较小的缩放比例，以保持宽高比
+	if maxWidth > 0 && maxHeight > 0 {
+		scale := scaleWidth
+		if scaleHeight < scaleWidth {
+			scale = scaleHeight
+		}
+
+		// 计算缩略图尺寸
+		thumbnailWidth := int(float64(imgWidth) * scale)
+		thumbnailHeight := int(float64(imgHeight) * scale)
+
+		// 使用"image"库的Resample方法生成缩略图
+		thumbnail := image.NewRGBA(image.Rect(0, 0, thumbnailWidth, thumbnailHeight))
+		for y := 0; y < thumbnailHeight; y++ {
+			for x := 0; x < thumbnailWidth; x++ {
+				srcX := int(float64(x) / scale)
+				srcY := int(float64(y) / scale)
+				thumbnail.Set(x, y, img.At(srcX, srcY))
+			}
+		}
+
+		return thumbnail
+	}
+
+	// 如果只指定了宽度或高度，则根据最大不超过的规则生成缩略图
+	if maxWidth > 0 {
+		thumbnailWidth := maxWidth
+		thumbnailHeight := int(float64(imgHeight) * scaleWidth)
+
+		// 使用"image"库的Resample方法生成缩略图
+		thumbnail := image.NewRGBA(image.Rect(0, 0, thumbnailWidth, thumbnailHeight))
+		for y := 0; y < thumbnailHeight; y++ {
+			for x := 0; x < thumbnailWidth; x++ {
+				srcX := int(float64(x) / scaleWidth)
+				srcY := int(float64(y) / scaleWidth)
+				thumbnail.Set(x, y, img.At(srcX, srcY))
+			}
+		}
+
+		return thumbnail
+	}
+
+	if maxHeight > 0 {
+		thumbnailWidth := int(float64(imgWidth) * scaleHeight)
+		thumbnailHeight := maxHeight
+
+		// 使用"image"库的Resample方法生成缩略图
+		thumbnail := image.NewRGBA(image.Rect(0, 0, thumbnailWidth, thumbnailHeight))
+		for y := 0; y < thumbnailHeight; y++ {
+			for x := 0; x < thumbnailWidth; x++ {
+				srcX := int(float64(x) / scaleHeight)
+				srcY := int(float64(y) / scaleHeight)
+				thumbnail.Set(x, y, img.At(srcX, srcY))
+			}
+		}
+
+		return thumbnail
+	}
+
+	// 默认情况下，返回原始图片
+	return img
+}