修复图标显示

resources/genico/main.go

@@ -0,0 +1,51 @@
+// genico converts resources/icon.png into a Windows .ico file using the
+// PNG-in-ICO format (the PNG bytes are wrapped in a minimal ICO container
+// without decoding/re-encoding). Works on Windows Vista and later.
+//
+// Run: go run resources/genico/main.go
+package main
+
+import (
+	"encoding/binary"
+	"fmt"
+	"os"
+)
+
+func main() {
+	pngData, err := os.ReadFile("resources/icon.png")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "genico: %v\n", err)
+		os.Exit(1)
+	}
+
+	// ICO header (6 bytes) + one directory entry (16 bytes) = 22 bytes overhead.
+	const headerSize = 6
+	const entrySize = 16
+	dataOffset := uint32(headerSize + entrySize)
+
+	ico := make([]byte, 0, headerSize+entrySize+len(pngData))
+
+	// ICONDIR
+	ico = binary.LittleEndian.AppendUint16(ico, 0) // reserved
+	ico = binary.LittleEndian.AppendUint16(ico, 1) // type = icon
+	ico = binary.LittleEndian.AppendUint16(ico, 1) // count = 1 image
+
+	// ICONDIRENTRY
+	ico = append(ico, 0)                            // width (0 = 256+, actual size in PNG header)
+	ico = append(ico, 0)                            // height (0 = 256+, actual size in PNG header)
+	ico = append(ico, 0)                            // color count (0 = ≥256 colors)
+	ico = append(ico, 0)                            // reserved
+	ico = binary.LittleEndian.AppendUint16(ico, 1)  // planes
+	ico = binary.LittleEndian.AppendUint16(ico, 32) // bit count
+	ico = binary.LittleEndian.AppendUint32(ico, uint32(len(pngData)))
+	ico = binary.LittleEndian.AppendUint32(ico, dataOffset)
+
+	// PNG image data
+	ico = append(ico, pngData...)
+
+	if err := os.WriteFile("resources/icon.ico", ico, 0644); err != nil {
+		fmt.Fprintf(os.Stderr, "genico: %v\n", err)
+		os.Exit(1)
+	}
+	fmt.Println("Generated resources/icon.ico")
+}