From 6291d0d40029cd64a282ce5696519a3c3438a5a6 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 2 Jan 2023 17:13:56 +0530
Subject: [PATCH] Code to check if an image is Opaque

---
 tools/utils/images/opaque.go | 40 ++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 tools/utils/images/opaque.go

diff --git a/tools/utils/images/opaque.go b/tools/utils/images/opaque.go
new file mode 100644
index 000000000..c81c7db02
--- /dev/null
+++ b/tools/utils/images/opaque.go
@@ -0,0 +1,40 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package images
+
+import (
+	"fmt"
+	"image"
+)
+
+var _ = fmt.Print
+
+func IsOpaque(img image.Image) bool {
+	switch img.(type) {
+	case *image.RGBA:
+		return img.(*image.RGBA).Opaque()
+	case *image.RGBA64:
+		return img.(*image.RGBA64).Opaque()
+	case *image.NRGBA:
+		return img.(*image.NRGBA).Opaque()
+	case *image.NRGBA64:
+		return img.(*image.NRGBA).Opaque()
+	case *image.Alpha:
+		return img.(*image.Alpha).Opaque()
+	case *image.Alpha16:
+		return img.(*image.Alpha16).Opaque()
+	case *image.Gray:
+		return img.(*image.Gray).Opaque()
+	case *image.Gray16:
+		return img.(*image.Gray16).Opaque()
+	case *image.CMYK:
+		return img.(*image.CMYK).Opaque()
+	case *image.Paletted:
+		return img.(*image.Paletted).Opaque()
+	case *image.Uniform:
+		return img.(*image.Uniform).Opaque()
+	case *NRGB:
+		return img.(*NRGB).Opaque()
+	}
+	return false
+}