This closes #1405, add new function SetSheetBackgroundFromBytes (#1406)

Co-authored-by: houjianxin.rupert <houjianxin.rupert@bytedance.com>

3 files changed, 51 insertions, 7 deletions

diff --git a/picture.go b/picture.go
index b4629b0..045e2af 100644
--- a/picture.go
+++ b/picture.go
@@ -38,7 +38,8 @@ func parsePictureOptions(opts string) (*pictureOptions, error) {
 
 // AddPicture provides the method to add picture in a sheet by given picture
 // format set (such as offset, scale, aspect ratio setting and print settings)
-// and file path. This function is concurrency safe. For example:
+// and file path, supported image types: EMF, EMZ, GIF, JPEG, JPG, PNG, SVG,
+// TIF, TIFF, WMF, and WMZ. This function is concurrency safe. For example:
 //
 //	package main
 //
@@ -121,7 +122,9 @@ func (f *File) AddPicture(sheet, cell, picture, format string) error {
 
 // AddPictureFromBytes provides the method to add picture in a sheet by given
 // picture format set (such as offset, scale, aspect ratio setting and print
-// settings), file base name, extension name and file bytes. For example:
+// settings), file base name, extension name and file bytes, supported image
+// types: EMF, EMZ, GIF, JPEG, JPG, PNG, SVG, TIF, TIFF, WMF, and WMZ. For
+// example:
 //
 //	package main
 //
diff --git a/sheet.go b/sheet.go
index e241abd..bbf529a 100644
--- a/sheet.go
+++ b/sheet.go
@@ -485,23 +485,40 @@ func (f *File) getSheetXMLPath(sheet string) (string, bool) {
 }
 
 // SetSheetBackground provides a function to set background picture by given
-// worksheet name and file path.
+// worksheet name and file path. Supported image types: EMF, EMZ, GIF, JPEG,
+// JPG, PNG, SVG, TIF, TIFF, WMF, and WMZ.
 func (f *File) SetSheetBackground(sheet, picture string) error {
 	var err error
 	// Check picture exists first.
 	if _, err = os.Stat(picture); os.IsNotExist(err) {
 		return err
 	}
-	ext, ok := supportedImageTypes[path.Ext(picture)]
+	file, _ := os.ReadFile(filepath.Clean(picture))
+	return f.setSheetBackground(sheet, path.Ext(picture), file)
+}
+
+// SetSheetBackgroundFromBytes provides a function to set background picture by
+// given worksheet name, extension name and image data. Supported image types:
+// EMF, EMZ, GIF, JPEG, JPG, PNG, SVG, TIF, TIFF, WMF, and WMZ.
+func (f *File) SetSheetBackgroundFromBytes(sheet, extension string, picture []byte) error {
+	if len(picture) == 0 {
+		return ErrParameterInvalid
+	}
+	return f.setSheetBackground(sheet, extension, picture)
+}
+
+// setSheetBackground provides a function to set background picture by given
+// worksheet name, file name extension and image data.
+func (f *File) setSheetBackground(sheet, extension string, file []byte) error {
+	imageType, ok := supportedImageTypes[extension]
 	if !ok {
 		return ErrImgExt
 	}
-	file, _ := os.ReadFile(filepath.Clean(picture))
-	name := f.addMedia(file, ext)
+	name := f.addMedia(file, imageType)
 	sheetXMLPath, _ := f.getSheetXMLPath(sheet)
 	sheetRels := "xl/worksheets/_rels/" + strings.TrimPrefix(sheetXMLPath, "xl/worksheets/") + ".rels"
 	rID := f.addRels(sheetRels, SourceRelationshipImage, strings.Replace(name, "xl", "..", 1), "")
-	if err = f.addSheetPicture(sheet, rID); err != nil {
+	if err := f.addSheetPicture(sheet, rID); err != nil {
 		return err
 	}
 	f.addSheetNameSpace(sheet, SourceRelationship)
diff --git a/sheet_test.go b/sheet_test.go
index 08c7c1a..2494cfb 100644
--- a/sheet_test.go
+++ b/sheet_test.go
@@ -3,6 +3,8 @@ package excelize
 import (
 	"encoding/xml"
 	"fmt"
+	"io"
+	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -463,3 +465,25 @@ func TestAttrValToFloat(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, 42.1, got)
 }
+
+func TestSetSheetBackgroundFromBytes(t *testing.T) {
+	f := NewFile()
+	f.SetSheetName("Sheet1", ".svg")
+	for i, imageTypes := range []string{".svg", ".emf", ".emz", ".gif", ".jpg", ".png", ".tif", ".wmf", ".wmz"} {
+		file := fmt.Sprintf("excelize%s", imageTypes)
+		if i > 0 {
+			file = filepath.Join("test", "images", fmt.Sprintf("excel%s", imageTypes))
+			f.NewSheet(imageTypes)
+		}
+		img, err := os.Open(file)
+		assert.NoError(t, err)
+		content, err := io.ReadAll(img)
+		assert.NoError(t, err)
+		assert.NoError(t, img.Close())
+		assert.NoError(t, f.SetSheetBackgroundFromBytes(imageTypes, imageTypes, content))
+	}
+	assert.NoError(t, f.SaveAs(filepath.Join("test", "TestSetSheetBackgroundFromBytes.xlsx")))
+	assert.NoError(t, f.Close())
+
+	assert.EqualError(t, f.SetSheetBackgroundFromBytes("Sheet1", ".svg", nil), ErrParameterInvalid.Error())
+}