mcs/class/System.Drawing/System.Drawing.Imaging/BitmapData.cs

   1 //\r
   2 // System.Drawing.Imaging.BitmapData.cs\r
   3 //\r
   4 // Author:\r
   5 //   Miguel de Icaza (miguel@ximian.com\r
   6 //\r
   7 // (C) 2002 Ximian, Inc.  http://www.ximian.com\r
   8 //\r
   9 \r
  10 using System;\r
  11 using System.Runtime.InteropServices;\r
  12 using System.IO;\r
  13 \r
  14 namespace System.Drawing.Imaging\r
  15 {\r
  16         [StructLayout(LayoutKind.Sequential)]\r
  17         public sealed class BitmapData {\r
  18                 internal int width, height, stride;\r
  19                 internal PixelFormat pixel_format;
  20                 internal bool own_scan0;
  21                 internal IntPtr address;\r
  22                 internal int reserved;\r
  23                 private  bool bAllocated = false;\r
  24                 \r
  25                 ~BitmapData()\r
  26                 {                       \r
  27                         if (bAllocated)\r
  28                                 Marshal.FreeHGlobal(address);                                           \r
  29                 }\r
  30                 \r
  31                 internal bool Allocated {\r
  32                         set {bAllocated = value;}\r
  33                 }\r
  34                 \r
  35                 public int Height {\r
  36                         get {\r
  37                                 return height;\r
  38                         }\r
  39 \r
  40                         set {\r
  41                                 height = value;\r
  42                         }\r
  43                 }\r
  44 \r
  45                 public int Width {\r
  46                         get {\r
  47                                 return width;\r
  48                         }\r
  49 \r
  50                         set {\r
  51                                 width = value;\r
  52                         }\r
  53                 }\r
  54 \r
  55                 public PixelFormat PixelFormat {\r
  56                         get {\r
  57                                 \r
  58                                 return pixel_format;\r
  59                         }\r
  60 \r
  61                         set {\r
  62                                 pixel_format = value;\r
  63                         }\r
  64                 }\r
  65 \r
  66                 public int Reserved {\r
  67                         get {\r
  68                                 return reserved;\r
  69                         }\r
  70 \r
  71                         set {\r
  72                                 reserved = value;\r
  73                         }\r
  74                 }\r
  75 \r
  76                 public IntPtr Scan0 {\r
  77                         get {\r
  78                                 return address;\r
  79                         }\r
  80 \r
  81                         set {\r
  82                                 \r
  83                                 if (bAllocated)\r
  84                                 {\r
  85                                         Marshal.FreeHGlobal(address);                           \r
  86                                         bAllocated = false;\r
  87                                 }\r
  88                                 \r
  89                                 address = value;\r
  90                         }\r
  91                 }\r
  92 \r
  93                 public int Stride {\r
  94                         get {\r
  95                                 return stride;\r
  96                         }\r
  97 \r
  98                         set {\r
  99                                 stride = value;\r
 100                         }\r
 101                 }\r
 102                 \r
 103                 internal unsafe void swap_red_blue_bytes () \r
 104                 {\r
 105                         byte *start = (byte *) (void *) this.Scan0;\r
 106                         int stride = this.Stride;\r
 107                         for (int line = 0; line < this.Height; line++){\r
 108                                 // Exchange red <=> blue bytes\r
 109 //                              fixed (byte *pbuf = start) {\r
 110                                         byte* curByte = start;\r
 111                                         for (int i = 0; i < this.Width; i++) {\r
 112                                                 byte t = *(curByte+2);\r
 113                                                 *(curByte+2) = *curByte;\r
 114                                                 *curByte = t;\r
 115                                                 curByte += 3;\r
 116                                         }\r
 117 //                              }\r
 118                                 start += stride;\r
 119                         }\r
 120                 }\r
 121         }\r
 122 }\r