From 82e354862815b59e36a75d360242b9ac64d4f65d Mon Sep 17 00:00:00 2001
From: lixiangwuxian <mail@lxtend.com>
Date: Wed, 14 May 2025 00:08:11 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=96=B0=E5=A2=9EAPNG=E6=94=AF?=
 =?UTF-8?q?=E6=8C=81=EF=BC=8C=E6=B7=BB=E5=8A=A0SaveToApng=E6=96=B9?=
 =?UTF-8?q?=E6=B3=95=E5=B9=B6=E6=9B=B4=E6=96=B0main.go=E4=BB=A5=E5=A4=84?=
 =?UTF-8?q?=E7=90=86APNG=E7=B2=BE=E7=81=B5=E3=80=82?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 main.go                      |  3 +++
 sprite/named_sprite_board.go | 27 +++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/main.go b/main.go
index e0ec0e2..bd0e827 100644
--- a/main.go
+++ b/main.go
@@ -149,6 +149,9 @@ func main() {
 	if err := board.SaveToGif("test.gif"); err != nil {
 		log.Fatal(err)
 	}
+	if err := board.SaveToApng("test.apng"); err != nil {
+		log.Fatal(err)
+	}
 	if err := board.SaveToWebp("test.webp"); err != nil {
 		log.Fatal(err)
 	}
diff --git a/sprite/named_sprite_board.go b/sprite/named_sprite_board.go
index a4c4c3a..eb18963 100644
--- a/sprite/named_sprite_board.go
+++ b/sprite/named_sprite_board.go
@@ -12,6 +12,7 @@ import (
 	"sort"
 
 	"github.com/HugoSmits86/nativewebp"
+	"github.com/kettek/apng"
 )
 
 // 设置为true启用调试日志
@@ -959,3 +960,29 @@ func (b *NamedSpriteBoard) SaveToWebp(filename string) error {
 	}
 	return nil
 }
+
+func (b *NamedSpriteBoard) SaveToApng(filename string) error {
+	frames, delays := b.RenderToAnimatedImage()
+	if len(frames) == 0 {
+		return errors.New("no frames to save")
+	}
+	apngData := apng.APNG{
+		Frames: make([]apng.Frame, len(frames)),
+	}
+	for i, frame := range frames {
+		apngData.Frames[i] = apng.Frame{
+			Image:            frame,
+			DelayNumerator:   uint16(delays[i]),
+			DelayDenominator: 100,
+		}
+	}
+	f, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	if err := apng.Encode(f, apngData); err != nil {
+		return err
+	}
+	return nil
+}