Exemplo n.º 1
0
 /// <include file='../docs.xml'
 /// path='docs/doc[@name="M:PeterO.Png4BitIndexed.Save(System.String)"]/*'/>
 public void Save(string filename)
 {
     if (filename == null)
     {
         throw new ArgumentNullException("filename");
     }
     if (filename.Length == 0)
     {
         throw new ArgumentException("filename" + " is empty.");
     }
     using (var fs = new FileStream(filename, FileMode.Create)) {
         fs.Write(this.subdata1, 0, this.subdata1.Length);
         var    crc32    = Png.Crc32(this.subdata1, 12, 17, 0);
         byte[] deflated = null;
         fs.Write(this.GetBE(crc32), 0, 4);
         // Write the color data
         fs.Write(this.GetBE(48), 0, 4);
         fs.Write(new byte[] { 0x50, 0x4c, 0x54, 0x45 }, 0, 4);
         crc32 = Png.Crc32(new byte[] { 0x50, 0x4c, 0x54, 0x45 }, 0, 4, 0);
         crc32 = Png.Crc32(this.colors, 0, 48, crc32);
         fs.Write(this.colors, 0, 48);
         fs.Write(this.GetBE(crc32), 0, 4);
         // Write the transparent color
         if (this.transparent >= 0 && this.transparent < 16)
         {
             fs.Write(this.GetBE(1), 0, 4);
             fs.Write(new byte[] { 0x74, 0x52, 0x4e, 0x53 }, 0, 4);
             crc32 = Png.Crc32(new byte[] { 0x74, 0x52, 0x4e, 0x53 }, 0, 4, 0);
             crc32 = Png.Crc32(new[] { (byte)this.transparent }, 0, 1, crc32);
             fs.Write(new[] { (byte)this.transparent }, 0, 1);
             fs.Write(this.GetBE(crc32), 0, 4);
         }
         // Write the image data
         using (var ms = new MemoryStream()) {
             // PNG compression uses a ZLIB stream not a DEFLATE stream
             ms.WriteByte(0x78);
             ms.WriteByte(0x9c);
             using (
                 var ds = new DeflateStream(
                     ms,
                     CompressionMode.Compress,
                     true)) {
                 ds.Write(this.data, 0, this.data.Length);
             }
             ms.Write(Png.Adler32(this.data, 0, this.data.Length), 0, 4);
             deflated = ms.ToArray();
         }
         var defLength = new[] { (byte)((deflated.Length >> 24) & 255),
                                 (byte)((deflated.Length >> 16) & 255),
                                 (byte)((deflated.Length >> 8) & 255),
                                 (byte)((deflated.Length >> 0) & 255) };
         fs.Write(defLength, 0, defLength.Length);
         fs.Write(new byte[] { 0x49, 0x44, 0x41, 0x54 }, 0, 4);
         fs.Write(deflated, 0, deflated.Length);
         var crc     = Png.Crc32(deflated, 0, deflated.Length, this.idatCrc);
         var subdcrc = this.GetBE(crc);
         fs.Write(subdcrc, 0, subdcrc.Length);
         fs.Write(this.subdata2, 0, this.subdata2.Length);
     }
 }
Exemplo n.º 2
0
 /// <include file='../docs.xml'
 /// path='docs/doc[@name="M:PeterO.Png8BitIndexed.#ctor(System.Int32,System.Int32)"]/*'/>
 public Png8BitIndexed(int width, int height)
 {
     if (width < 1)
     {
         throw new ArgumentException("width (" + width +
                                     ") is less than 1");
     }
     if (width > 65535)
     {
         throw new ArgumentException("width (" + width + ") is more than 65535");
     }
     if (height < 1)
     {
         throw new ArgumentException("height (" + height +
                                     ") is less than 1");
     }
     if (height > 65535)
     {
         throw new ArgumentException("height (" + height + ") is more than 65535");
     }
     this.colors      = new byte[256 * 3];
     this.transparent = -1;
     this.subdata1    = new byte[] { 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0,
                                     0, 0, 0xd,
                                     0x49, 0x48, 0x44, 0x52,
                                     0, 0, (byte)(width >> 8), (byte)(width & 255),
                                     0, 0, (byte)(height >> 8), (byte)(height & 255),
                                     8, 3, 0, 0, 0 };
     this.width       = width;
     this.height      = height;
     this.realRowSize = this.width + 1;
     this.blockSize   = this.realRowSize;
     this.rowSize     = this.realRowSize;
     this.imageData   = new byte[this.rowSize * this.height];
     this.data        = this.imageData;
     this.idatCrc     = Png.Crc32(
         new byte[] { 0x49,
                      0x44,
                      0x41,
                      0x54 },
         0,
         4,
         0);
     this.subdata2 = new byte[] { 0, 0, 0, 0, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42,
                                  0x60, 0x82 };
 }