From ee3fd02a0a4425150e2b488eb2b14e72d5e97855 Mon Sep 17 00:00:00 2001
From: xiaoqidun <xiaoqidun@gmail.com>
Date: Tue, 13 Oct 2026 23:10:31 +0800
Subject: [PATCH] =?UTF-8?q?feat(=E5=9B=BE=E5=83=8F=E5=A4=84=E7=90=86):=20?=
 =?UTF-8?q?=E9=99=8D=E4=BD=8E=E5=9B=BE=E5=83=8F=E5=A4=84=E7=90=86=E5=86=85?=
 =?UTF-8?q?=E5=AD=98=E5=BC=80=E9=94=80?=
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Content-Transfer-Encoding: 8bit

---
 ofdgo_image.go | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/ofdgo_image.go b/ofdgo_image.go
index 7522f5f..c2e8ed2 100644
--- a/ofdgo_image.go
+++ b/ofdgo_image.go
@@ -604,19 +604,14 @@ func imageGrayAt(img image.Image, x, y int) color.Gray {
 // 入参: img 图片对象, x X坐标, y Y坐标
 // 返回: color.NRGBA NRGBA像素
 func imageNRGBAAt(img image.Image, x, y int) color.NRGBA {
-	if src, ok := img.(interface{ NRGBAAt(int, int) color.NRGBA }); ok {
+	switch src := img.(type) {
+	case interface{ NRGBAAt(int, int) color.NRGBA }:
 		return src.NRGBAAt(x, y)
-	}
-	if src, ok := img.(interface{ NRGBA64At(int, int) color.NRGBA64 }); ok {
+	case interface{ NRGBA64At(int, int) color.NRGBA64 }:
 		c := src.NRGBA64At(x, y)
 		return color.NRGBA{R: uint8(c.R >> 8), G: uint8(c.G >> 8), B: uint8(c.B >> 8), A: uint8(c.A >> 8)}
-	}
-	if src, ok := img.(*image.YCbCr); ok {
-		r, g, b, _ := src.YCbCrAt(x, y).RGBA()
-		return color.NRGBA{R: uint8(r >> 8), G: uint8(g >> 8), B: uint8(b >> 8), A: 255}
-	}
-	if src, ok := img.(*image.RGBA); ok {
-		c := src.RGBA64At(x, y)
+	case *image.RGBA, *image.RGBA64, *image.Gray, *image.Gray16, *image.Alpha, *image.Alpha16, *image.CMYK, *image.YCbCr, *image.NYCbCrA:
+		c := src.(image.RGBA64Image).RGBA64At(x, y)
 		if c.A == 0 {
 			return color.NRGBA{}
 		}
@@ -683,13 +678,13 @@ func imageNRGBA64At(img image.Image, x, y int) color.NRGBA64 {
 	case *image.Gray16:
 		c := src.Gray16At(x, y)
 		return color.NRGBA64{R: c.Y, G: c.Y, B: c.Y, A: 0xffff}
-	case *image.Alpha16:
-		c := src.Alpha16At(x, y)
+	case *image.Alpha, *image.Alpha16:
+		c := src.(image.RGBA64Image).RGBA64At(x, y)
 		if c.A == 0 {
 			return color.NRGBA64{}
 		}
 		return color.NRGBA64{R: 0xffff, G: 0xffff, B: 0xffff, A: c.A}
-	case *image.RGBA, *image.RGBA64:
+	case *image.RGBA, *image.RGBA64, *image.CMYK, *image.YCbCr, *image.NYCbCrA:
 		c := src.(image.RGBA64Image).RGBA64At(x, y)
 		if c.A == 0 {
 			return color.NRGBA64{}