2 // System.Drawing.Imaging.EncoderParameters.cs
5 // Ravindra (rkumar@novell.com)
6 // Vladimir Vukicevic (vladimir@pobox.com)
8 // (C) 2004 Novell, Inc. http://www.novell.com
12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
14 // Permission is hereby granted, free of charge, to any person obtaining
15 // a copy of this software and associated documentation files (the
16 // "Software"), to deal in the Software without restriction, including
17 // without limitation the rights to use, copy, modify, merge, publish,
18 // distribute, sublicense, and/or sell copies of the Software, and to
19 // permit persons to whom the Software is furnished to do so, subject to
20 // the following conditions:
22 // The above copyright notice and this permission notice shall be
23 // included in all copies or substantial portions of the Software.
25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35 using System.Runtime.InteropServices;
37 namespace System.Drawing.Imaging
39 public sealed class EncoderParameters : IDisposable
41 private EncoderParameter[] parameters;
43 public EncoderParameters () {
44 parameters = new EncoderParameter[1];
47 public EncoderParameters (int count) {
48 parameters = new EncoderParameter[count];
51 public EncoderParameter[] Param {
61 public void Dispose () {
63 GC.SuppressFinalize(this);
66 internal IntPtr ToNativePtr () {
70 // 4 is the initial int32 "count" value
71 result = Marshal.AllocHGlobal (4 + parameters.Length * EncoderParameter.NativeSize());
74 Marshal.WriteInt32 (ptr, parameters.Length);
76 ptr = (IntPtr) (ptr.ToInt64() + 4);
77 for (int i = 0; i < parameters.Length; i++) {
78 parameters[i].ToNativePtr (ptr);
79 ptr = (IntPtr) ((int) ptr + EncoderParameter.NativeSize());
85 /* The IntPtr passed in here is a blob returned from
86 * GdipImageGetEncoderParameterList. Its internal pointers
87 * (i.e. the Value pointers in the EncoderParameter entries)
88 * point to areas within this block of memeory; this means
89 * that we need to free it as a whole, and also means that
90 * we can't Marshal.PtrToStruct our way to victory.
92 internal static EncoderParameters FromNativePtr (IntPtr epPtr) {
93 if (epPtr == IntPtr.Zero)
98 int count = Marshal.ReadInt32 (ptr);
99 ptr = (IntPtr) (ptr.ToInt64() + 4);
104 EncoderParameters result = new EncoderParameters (count);
106 for (int i = 0; i < count; i++) {
107 result.parameters[i] = EncoderParameter.FromNativePtr (ptr);
108 ptr = (IntPtr) ((int) ptr + EncoderParameter.NativeSize());