class/System.Windows/System.Windows.Media.Imaging/WriteableBitmap.cs

   1 //
   2 // BitmapImage.cs
   3 //
   4 // Copyright 2008 Novell, Inc.
   5 //
   6 // Permission is hereby granted, free of charge, to any person obtaining
   7 // a copy of this software and associated documentation files (the
   8 // "Software"), to deal in the Software without restriction, including
   9 // without limitation the rights to use, copy, modify, merge, publish,
  10 // distribute, sublicense, and/or sell copies of the Software, and to
  11 // permit persons to whom the Software is furnished to do so, subject to
  12 // the following conditions:
  13 //
  14 // The above copyright notice and this permission notice shall be
  15 // included in all copies or substantial portions of the Software.
  16 //
  17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  21 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24 //
  25
  26 using System.Windows;
  27 using System.Windows.Controls;
  28 using System.Windows.Media;
  29 using System.Windows.Resources;
  30 using System.IO;
  31 using System.Threading;
  32 using System.Net;
  33 using System.Runtime.InteropServices;
  34 using Mono;
  35
  36 namespace System.Windows.Media.Imaging
  37 {
  38         public partial class WriteableBitmap : BitmapSource
  39         {
  40                 int[] pixels;
  41                 GCHandle pixels_handle;
  42
  43                 public WriteableBitmap (BitmapSource source) : base (NativeMethods.writeable_bitmap_new (), true)
  44                 {
  45                         if (source != null)
  46                                 NativeMethods.writeable_bitmap_initialize_from_bitmap_source (native, source.native);
  47
  48                         // FIXME: we need to test if modifications
  49                         // done to the WB update the BitmapSource's
  50                         // pixel data.  If they do, we can't use this
  51                         // copying code and need to do more
  52                         // complicated tricks to get the pixels array
  53                         // to reflect the contents of the
  54                         // bitmapsource.
  55                         //
  56                         // FIXME: we aren't taking row stride into
  57                         // account here.  we're assuming the pixel
  58                         // data of the source is 32 bits.
  59                         pixels = new int[source.PixelWidth * source.PixelHeight];
  60                         IntPtr bitmap_data = NativeMethods.bitmap_source_get_bitmap_data (source.native);
  61                         if (bitmap_data != IntPtr.Zero)
  62                                 Marshal.Copy (bitmap_data, pixels, 0, pixels.Length);
  63
  64                         PinAndSetBitmapData ();
  65                 }
  66
  67                 public WriteableBitmap (int width, int height) : base (NativeMethods.writeable_bitmap_new (), true)
  68                 {
  69                         PixelWidth = width;
  70                         PixelHeight = height;
  71
  72                         pixels = new int[PixelWidth * PixelHeight];
  73
  74                         PinAndSetBitmapData ();
  75                 }
  76
  77                 void PinAndSetBitmapData ()
  78                 {
  79                         pixels_handle = GCHandle.Alloc(pixels, GCHandleType.Pinned); // pin it so it doesn't move
  80
  81                         NativeMethods.bitmap_source_set_bitmap_data (native, pixels_handle.AddrOfPinnedObject(), false);
  82                 }
  83
  84                 ~WriteableBitmap ()
  85                 {
  86                         if (pixels_handle.IsAllocated) {
  87                                 pixels_handle.Free ();
  88                         }
  89                 }
  90
  91                 public int[] Pixels {
  92                         get { return pixels; }
  93                 }
  94
  95                 public void Render (UIElement element, Transform transform)
  96                 {
  97                         if (element == null)
  98                                 throw new NullReferenceException ("element cannot be null");
  99                         if (transform == null)
 100                                 throw new NullReferenceException ("transform cannot be null");
 101
 102                         NativeMethods.writeable_bitmap_render (native, element.native, transform.native);
 103                 }
 104
 105                 public void Invalidate ()
 106                 {
 107                         NativeMethods.bitmap_source_invalidate (native);
 108                 }
 109         }
 110
 111 }