2 // System.Drawing.Imaging.EncoderParameters.cs
5 // Ravindra (rkumar@novell.com)
6 // Vladimir Vukicevic (vladimir@pobox.com)
8 // Copyright (C) 2004, 2008 Novell, Inc (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System.Runtime.InteropServices;
33 namespace System.Drawing.Imaging
35 public sealed class EncoderParameters : IDisposable
37 private EncoderParameter[] parameters;
39 public EncoderParameters () {
40 parameters = new EncoderParameter[1];
43 public EncoderParameters (int count) {
44 parameters = new EncoderParameter[count];
47 public EncoderParameter[] Param {
57 public void Dispose () {
59 GC.SuppressFinalize(this);
61 internal IntPtr ToNativePtr () {
65 // 4 is the initial int32 "count" value
66 result = Marshal.AllocHGlobal (4 + parameters.Length * EncoderParameter.NativeSize());
69 Marshal.WriteInt32 (ptr, parameters.Length);
71 ptr = (IntPtr) (ptr.ToInt64() + 4);
72 for (int i = 0; i < parameters.Length; i++) {
73 parameters[i].ToNativePtr (ptr);
74 ptr = (IntPtr) (ptr.ToInt64 () + EncoderParameter.NativeSize ());
80 /* The IntPtr passed in here is a blob returned from
81 * GdipImageGetEncoderParameterList. Its internal pointers
82 * (i.e. the Value pointers in the EncoderParameter entries)
83 * point to areas within this block of memeory; this means
84 * that we need to free it as a whole, and also means that
85 * we can't Marshal.PtrToStruct our way to victory.
87 internal static EncoderParameters FromNativePtr (IntPtr epPtr) {
88 if (epPtr == IntPtr.Zero)
93 int count = Marshal.ReadInt32 (ptr);
94 ptr = (IntPtr) (ptr.ToInt64() + 4);
99 EncoderParameters result = new EncoderParameters (count);
101 for (int i = 0; i < count; i++) {
102 result.parameters[i] = EncoderParameter.FromNativePtr (ptr);
103 ptr = (IntPtr) (ptr.ToInt64 () + EncoderParameter.NativeSize ());