■ WEBP 파일로 변환하는 방법을 보여준다.
▶ WEBPHelper.cs
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using System; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Runtime.InteropServices; namespace TestProject { /// <summary> /// WEBP 헬퍼 /// </summary> public static class WEBPHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Import ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region WEBP BGR 인코딩하기 - WebPEncodeBGR(sourceDataHandle, width, height, stride, quality, targetDataHandle) /// <summary> /// WEBP BGR 인코딩하기 /// </summary> /// <param name="sourceDataHandle">소스 데이터 핸들</param> /// <param name="width">너비</param> /// <param name="height">높이</param> /// <param name="stride">보폭</param> /// <param name="quality">품질</param> /// <param name="targetDataHandle">타겟 데이터 핸들</param> /// <returns>타겟 데이터 바이트 길이</returns> [DllImport("libwebp", CallingConvention = CallingConvention.Cdecl)] private static extern int WebPEncodeBGR ( IntPtr sourceDataHandle, int width, int height, int stride, float quality, out IntPtr targetDataHandle ); #endregion #region WEBP BGR 인코딩하기 (무손실) - WebPEncodeLosslessBGR(sourceDataHandle, width, height, stride, targetDataHandle) /// <summary> /// WEBP BGR 인코딩하기 (무손실) /// </summary> /// <param name="sourceDataHandle">소스 데이터 핸들</param> /// <param name="width">너비</param> /// <param name="height">높이</param> /// <param name="stride">보폭</param> /// <param name="targetDataHandle">타겟 데이터 핸들</param> /// <returns>타겟 데이터 바이트 길이</returns> [DllImport("libwebp", CallingConvention = CallingConvention.Cdecl)] private static extern int WebPEncodeLosslessBGR(IntPtr sourceDataHandle, int width, int height, int stride, out IntPtr targetDataHandle); #endregion #region WEBP 해제하기 - WebPFree(targetDataHandle) /// <summary> /// WEBP 해제하기 /// </summary> /// <param name="targetDataHandle">타겟 데이터 핸들</param> /// <returns>처리 결과</returns> [DllImport("libwebp", CallingConvention = CallingConvention.Cdecl)] private static extern int WebPFree(IntPtr targetDataHandle); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 저장하기 - Save(sourceBitmap, targetFilePath, quality) /// <summary> /// 저장하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="targetFilePath">타겟 파일 경로</param> /// <param name="quality">품질</param> public static void Save(Bitmap sourceBitmap, string targetFilePath, int quality) { Convert(sourceBitmap, out byte[] targetByteArray, quality); File.WriteAllBytes(targetFilePath, targetByteArray); } #endregion #region 저장하기 (무손실) - Save(sourceBitmap, targetFilePath) /// <summary> /// 저장하기 (무손실) /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="targetFilePath">타겟 파일 경로</param> public static void Save(Bitmap sourceBitmap, string targetFilePath) { Convert(sourceBitmap, out byte[] targetByteArray); File.WriteAllBytes(targetFilePath, targetByteArray); } #endregion //////////////////////////////////////////////////////////////////////////////// Public #region 변환하기 - Convert(sourceBitmap, targetByteArray, quality) /// <summary> /// 변환하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="targetByteArray">타겟 바이트 배열</param> /// <param name="quality">품질</param> private static void Convert(Bitmap sourceBitmap, out byte[] targetByteArray, int quality) { BitmapData sourceBitmapData = sourceBitmap.LockBits ( new Rectangle(0, 0, sourceBitmap.Width, sourceBitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb ); int targetDataByteLength = WebPEncodeBGR ( sourceBitmapData.Scan0, sourceBitmap.Width, sourceBitmap.Height, sourceBitmapData.Stride, quality, out IntPtr targetHandle ); targetByteArray = new byte[targetDataByteLength]; Marshal.Copy(targetHandle, targetByteArray, 0, targetDataByteLength); sourceBitmap.UnlockBits(sourceBitmapData); WebPFree(targetHandle); } #endregion #region 변환하기 - Convert(sourceBitmap, targetByteArray) /// <summary> /// 변환하기 /// </summary> /// <param name="sourceBitmap">소스 비트맵</param> /// <param name="targetByteArray">타겟 바이트 배열</param> private static void Convert(Bitmap sourceBitmap, out byte[] targetByteArray) { BitmapData sourceBitmapData = sourceBitmap.LockBits ( new Rectangle(0, 0, sourceBitmap.Width, sourceBitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb ); int targetDataByteLength = WebPEncodeLosslessBGR ( sourceBitmapData.Scan0, sourceBitmap.Width, sourceBitmap.Height, sourceBitmapData.Stride, out IntPtr targetHandle ); targetByteArray = new byte[targetDataByteLength]; Marshal.Copy(targetHandle, targetByteArray, 0, targetDataByteLength); sourceBitmap.UnlockBits(sourceBitmapData); WebPFree(targetHandle); } #endregion } } |
▶ Program.cs
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using System.Drawing; namespace TestProject { /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> private static void Main() { Bitmap sourceBitmap = new Bitmap("IMAGE\\source.png"); WEBPHelper.Save(sourceBitmap, "target1.webp", 75); WEBPHelper.Save(sourceBitmap, "target2.webp"); // 무손실 } #endregion } } |
※ 32비트 버전으로 컴파일할 수 없다.
