영상 압축 C# 소스 코드

영상압축 C#소스 코드

1. 메뉴를 다음과 같이 추가한다.
2. [압축_Load PCX] 메뉴를 더블클릭한 후 private void 압축LoadPCXDCTToolStripMenuItem_Click() 함수를 추가한다.
   
   private void 압축LoadPCXToolStripMenuItem_Click(object sender, EventArgs e) { f_LoadPCX(); }

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   private void 압축LoadPCXToolStripMenuItem_Click(object sender, EventArgs e) { f_LoadPCX(); }

   
    
3. PCX_HEADER 구조체를 생성한다.
   
   [Serializable] [StructLayout(LayoutKind.Sequential, Pack = 1)] struct PCX_HEADER { public byte manufacturer; public byte version; public byte encoding; public byte bits_per_pixel; public short xmin; public short ymin; public short xmax; public short ymax; public short hres; public short vres; //[FieldOffset(16)] [MarshalAs(UnmanagedType.ByValArray, SizeConst = 48)] public byte[] palette16; public byte reserved; public byte color_planes; public short bytes_per_line; public short palette_type; //[FieldOffset(76)] [MarshalAs(UnmanagedType.ByValArray, SizeConst = 58)] public byte[] filler; }

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   [Serializable] [StructLayout(LayoutKind.Sequential, Pack = 1)] struct PCX_HEADER { public byte manufacturer; public byte version; public byte encoding; public byte bits_per_pixel; public short xmin; public short ymin; public short xmax; public short ymax; public short hres; public short vres;   //[FieldOffset(16)] [MarshalAs(UnmanagedType.ByValArray, SizeConst = 48)] public byte[] palette16;   public byte reserved; public byte color_planes; public short bytes_per_line; public short palette_type;   //[FieldOffset(76)] [MarshalAs(UnmanagedType.ByValArray, SizeConst = 58)] public byte[] filler; }

   
    
4. f_LoadPCX() 함수를 생성한다.
   PCX파일을 읽어서 그림으로 출력하는 함수
5. private void f_LoadPCX() { OpenFileDialog ofnDlg = new OpenFileDialog(); ofnDlg.Filter = "pcx files (*.pcx)|*.pcx|pgm files (*.pgm)|*.pgm|jpg files (*.jpg)|*.jpg|png files (*.png)|*.png|bmp files (*.bmp)|*.bmp|All files (*.*)|*.*"; ofnDlg.FilterIndex = 1; ofnDlg.RestoreDirectory = true; if (ofnDlg.ShowDialog() == DialogResult.OK) { if (ofnDlg.FileName.ToUpper().Contains(".PCX")) { PCX_HEADER pcx_header; int header_size = Marshal.SizeOf(typeof(PCX_HEADER)); FileStream fs = new FileStream(ofnDlg.FileName, FileMode.Open, FileAccess.Read); BinaryReader br = new BinaryReader(fs); byte[] header = new byte[header_size]; br.Read(header, 0, header.Length); GCHandle handle = GCHandle.Alloc(header, GCHandleType.Pinned); pcx_header = (PCX_HEADER)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(PCX_HEADER)); handle.Free(); int imageWidth = pcx_header.xmax - pcx_header.xmin + 1; int imageHeight = pcx_header.ymax - pcx_header.ymin + 1; byte[] data = new byte[imageWidth * imageHeight]; byte c; int p = 0; int run_length; while(true){ c = br.ReadByte(); if ((c & 0xc0) == 0xc0) { run_length = c & 0x3f; c = br.ReadByte(); while (run_length > 0) { data[p++] = c; run_length--; } } else { data[p++] = c; } if (p >= imageWidth * imageHeight) break; } br.Close(); Bitmap bmp = f_makeImageFromData(imageWidth, imageHeight, data); f_drawImage(bmp); } } }

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   private void f_LoadPCX() { OpenFileDialog ofnDlg = new OpenFileDialog(); ofnDlg.Filter = "pcx files (*.pcx)|*.pcx|pgm files (*.pgm)|*.pgm|jpg files (*.jpg)|*.jpg|png files (*.png)|*.png|bmp files (*.bmp)|*.bmp|All files (*.*)|*.*"; ofnDlg.FilterIndex = 1; ofnDlg.RestoreDirectory = true;   if (ofnDlg.ShowDialog() == DialogResult.OK) { if (ofnDlg.FileName.ToUpper().Contains(".PCX")) { PCX_HEADER pcx_header; int header_size = Marshal.SizeOf(typeof(PCX_HEADER));   FileStream fs = new FileStream(ofnDlg.FileName, FileMode.Open, FileAccess.Read); BinaryReader br = new BinaryReader(fs); byte[] header = new byte[header_size]; br.Read(header, 0, header.Length);   GCHandle handle = GCHandle.Alloc(header, GCHandleType.Pinned); pcx_header = (PCX_HEADER)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(PCX_HEADER)); handle.Free();   int imageWidth = pcx_header.xmax - pcx_header.xmin + 1; int imageHeight = pcx_header.ymax - pcx_header.ymin + 1;   byte[] data = new byte[imageWidth * imageHeight];   byte c; int p = 0; int run_length; while(true){ c = br.ReadByte(); if ((c & 0xc0) == 0xc0) { run_length = c & 0x3f; c = br.ReadByte(); while (run_length > 0) { data[p++] = c; run_length--; } } else { data[p++] = c; } if (p >= imageWidth * imageHeight) break; }   br.Close();   Bitmap bmp = f_makeImageFromData(imageWidth, imageHeight, data); f_drawImage(bmp); } } }

   
    
6. [압축_Save PCX] 메뉴를 더블클릭한 후 private void 압축SavePCXToolStripMenuItem_Click() 함수를 추가한다.
   
   private void 압축SavePCXToolStripMenuItem_Click(object sender, EventArgs e) { Bitmap bmp = f_OpenBitmapFile(); if (bmp == null) return; byte[] data = f_getDataFromImage(bmp); ////////////////// Start if (bmp.PixelFormat != PixelFormat.Format8bppIndexed) { MessageBox.Show("8bit 색상 모델만 실행 가능합니다."); return; } f_SavePCX(data, bmp.Width, bmp.Height); ////////////////// End f_drawImage(bmp); }

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   private void 압축SavePCXToolStripMenuItem_Click(object sender, EventArgs e) { Bitmap bmp = f_OpenBitmapFile(); if (bmp == null) return;   byte[] data = f_getDataFromImage(bmp); ////////////////// Start if (bmp.PixelFormat != PixelFormat.Format8bppIndexed) { MessageBox.Show("8bit 색상 모델만 실행 가능합니다."); return; } f_SavePCX(data, bmp.Width, bmp.Height); ////////////////// End f_drawImage(bmp); }

   
    
7. f_SavePCX() 함수를 생성한다.
   영상을 PCX로 압축해서 저장하는 함수
   
   private void f_SavePCX(byte[] data, int imageWidth, int imageHeight) { SaveFileDialog ofnDlg = new SaveFileDialog(); ofnDlg.Filter = "pcx files (*.pcx)|*.pcx|pgm files (*.pgm)|*.pgm|jpg files (*.jpg)|*.jpg|png files (*.png)|*.png|bmp files (*.bmp)|*.bmp|All files (*.*)|*.*"; ofnDlg.FilterIndex = 1; ofnDlg.RestoreDirectory = true; if (ofnDlg.ShowDialog() == DialogResult.OK) { PCX_HEADER pcx_header = new PCX_HEADER();; pcx_header.manufacturer = 10; pcx_header.version = 5; pcx_header.encoding = 1; pcx_header.bits_per_pixel = 8; pcx_header.xmin = 0; pcx_header.ymin = 0; pcx_header.xmax = (short)(imageWidth-1); pcx_header.ymax = (short)(imageHeight-1); pcx_header.hres = 150; pcx_header.vres = 150; pcx_header.color_planes = 1; pcx_header.bytes_per_line = (short)imageWidth; pcx_header.palette_type = 1; int header_size = Marshal.SizeOf(typeof(PCX_HEADER)); byte[] header = new byte[header_size]; GCHandle handle = GCHandle.Alloc(header, GCHandleType.Pinned); Marshal.StructureToPtr(pcx_header, handle.AddrOfPinnedObject(), false); handle.Free(); FileStream fs = new FileStream(ofnDlg.FileName, FileMode.Create, FileAccess.Write); BinaryWriter bw = new BinaryWriter(fs); bw.Write(header); byte c; byte run_length; for (int y = 0; y < imageHeight; y++) { run_length = 0; for (int x = 0; x < imageWidth; x++) { c = data[y * imageWidth + x]; run_length++; if (x < imageWidth - 1 && c == data[y * imageWidth + x + 1] && run_length < 63) { //continue; } else if (run_length > 1 || (0xc0 & c) == 0xc0) { byte b = (byte)(0xc0 | run_length); bw.Write(b); bw.Write(c); run_length = 0; } else { bw.Write(c); run_length = 0; } } } bw.Close(); } }

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   private void f_SavePCX(byte[] data, int imageWidth, int imageHeight) { SaveFileDialog ofnDlg = new SaveFileDialog(); ofnDlg.Filter = "pcx files (*.pcx)|*.pcx|pgm files (*.pgm)|*.pgm|jpg files (*.jpg)|*.jpg|png files (*.png)|*.png|bmp files (*.bmp)|*.bmp|All files (*.*)|*.*"; ofnDlg.FilterIndex = 1; ofnDlg.RestoreDirectory = true;   if (ofnDlg.ShowDialog() == DialogResult.OK) { PCX_HEADER pcx_header = new PCX_HEADER();;   pcx_header.manufacturer = 10; pcx_header.version = 5; pcx_header.encoding = 1; pcx_header.bits_per_pixel = 8; pcx_header.xmin = 0; pcx_header.ymin = 0; pcx_header.xmax = (short)(imageWidth-1); pcx_header.ymax = (short)(imageHeight-1); pcx_header.hres = 150; pcx_header.vres = 150; pcx_header.color_planes = 1; pcx_header.bytes_per_line = (short)imageWidth; pcx_header.palette_type = 1;   int header_size = Marshal.SizeOf(typeof(PCX_HEADER)); byte[] header = new byte[header_size];   GCHandle handle = GCHandle.Alloc(header, GCHandleType.Pinned); Marshal.StructureToPtr(pcx_header, handle.AddrOfPinnedObject(), false); handle.Free();   FileStream fs = new FileStream(ofnDlg.FileName, FileMode.Create, FileAccess.Write); BinaryWriter bw = new BinaryWriter(fs); bw.Write(header);   byte c; byte run_length;   for (int y = 0; y < imageHeight; y++) { run_length = 0; for (int x = 0; x < imageWidth; x++) { c = data[y * imageWidth + x];   run_length++; if (x < imageWidth - 1 && c == data[y * imageWidth + x + 1] && run_length < 63) { //continue; } else if (run_length > 1 || (0xc0 & c) == 0xc0) { byte b = (byte)(0xc0 | run_length); bw.Write(b); bw.Write(c); run_length = 0; } else { bw.Write(c); run_length = 0; } } }   bw.Close(); } }