110 lines
3.1 KiB
C#
110 lines
3.1 KiB
C#
//
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// System.Drawing.Imaging.EncoderParameters.cs
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//
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// Author:
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// Ravindra (rkumar@novell.com)
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// Vladimir Vukicevic (vladimir@pobox.com)
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//
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// Copyright (C) 2004, 2008 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Runtime.InteropServices;
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namespace System.Drawing.Imaging
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{
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public sealed class EncoderParameters : IDisposable
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{
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private EncoderParameter[] parameters;
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public EncoderParameters () {
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parameters = new EncoderParameter[1];
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}
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public EncoderParameters (int count) {
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parameters = new EncoderParameter[count];
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}
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public EncoderParameter[] Param {
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get {
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return parameters;
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}
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set {
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parameters = value;
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}
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}
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public void Dispose () {
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// Nothing
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GC.SuppressFinalize(this);
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}
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internal IntPtr ToNativePtr () {
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IntPtr result;
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IntPtr ptr;
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// 4 is the initial int32 "count" value
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result = Marshal.AllocHGlobal (4 + parameters.Length * EncoderParameter.NativeSize());
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ptr = result;
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Marshal.WriteInt32 (ptr, parameters.Length);
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ptr = (IntPtr) (ptr.ToInt64() + 4);
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for (int i = 0; i < parameters.Length; i++) {
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parameters[i].ToNativePtr (ptr);
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ptr = (IntPtr) (ptr.ToInt64 () + EncoderParameter.NativeSize ());
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}
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return result;
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}
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/* The IntPtr passed in here is a blob returned from
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* GdipImageGetEncoderParameterList. Its internal pointers
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* (i.e. the Value pointers in the EncoderParameter entries)
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* point to areas within this block of memeory; this means
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* that we need to free it as a whole, and also means that
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* we can't Marshal.PtrToStruct our way to victory.
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*/
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internal static EncoderParameters FromNativePtr (IntPtr epPtr) {
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if (epPtr == IntPtr.Zero)
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return null;
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IntPtr ptr = epPtr;
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int count = Marshal.ReadInt32 (ptr);
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ptr = (IntPtr) (ptr.ToInt64() + 4);
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if (count == 0)
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return null;
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EncoderParameters result = new EncoderParameters (count);
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for (int i = 0; i < count; i++) {
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result.parameters[i] = EncoderParameter.FromNativePtr (ptr);
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ptr = (IntPtr) (ptr.ToInt64 () + EncoderParameter.NativeSize ());
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}
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return result;
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}
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}
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}
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