Direct Access Pixel Data, GetPixel, SetPixel<\/p>\n\n\n\n
using System;\nusing System.Drawing;\nusing System.Drawing.Imaging;\nusing System.IO;\npublic unsafe class MemoryBitmap : IDisposable\n{\n private readonly BitmapData _bmpData;\n private readonly int _depth;\n private readonly byte* _pfp;\n private readonly int _stride;\n private Bitmap _memoryBitmap;\n public MemoryBitmap(string path)\n {\n if (path.IsNullOrEmpty())\n throw new Exception(\"Path cannot be null or empty.\");\n if (!File.Exists(path))\n throw new Exception($\"Path {path} does not exist.\");\n var bitmap = new Bitmap(path);\n _memoryBitmap = bitmap;\n if (_memoryBitmap.PixelFormat != PixelFormat.Format32bppArgb && _memoryBitmap.PixelFormat != PixelFormat.Format24bppRgb && _memoryBitmap.PixelFormat != PixelFormat.Format8bppIndexed)\n {\n var clone = new Bitmap(_memoryBitmap.Width, _memoryBitmap.Height, PixelFormat.Format32bppArgb);\n using (var gr = Graphics.FromImage(clone))\n {\n gr.DrawImage(_memoryBitmap, new Rectangle(0, 0, clone.Width, clone.Height));\n _memoryBitmap = clone;\n }\n }\n Width = _memoryBitmap.Width;\n Height = _memoryBitmap.Height;\n var rect = new Rectangle(0, 0, _memoryBitmap.Width, _memoryBitmap.Height);\n try\n {\n _bmpData = _memoryBitmap.LockBits(rect, ImageLockMode.ReadWrite, _memoryBitmap.PixelFormat);\n }\n catch (Exception ex)\n {\n throw new Exception(\"Could not lock bitmap\", ex.InnerException);\n }\n _depth = Image.GetPixelFormatSize(_bmpData.PixelFormat) \/ 8;\n _pfp = (byte*) _bmpData.Scan0.ToPointer();\n _stride = _bmpData.Stride;\n }\n public MemoryBitmap(Bitmap bitmap)\n {\n _memoryBitmap = bitmap ?? throw new Exception(\"Bitmap cannot be null\");\n if (_memoryBitmap.PixelFormat != PixelFormat.Format32bppArgb && _memoryBitmap.PixelFormat != PixelFormat.Format24bppRgb && _memoryBitmap.PixelFormat != PixelFormat.Format8bppIndexed)\n {\n var clone = new Bitmap(_memoryBitmap.Width, _memoryBitmap.Height, PixelFormat.Format32bppArgb);\n using (var gr = Graphics.FromImage(clone))\n {\n gr.DrawImage(_memoryBitmap, new Rectangle(0, 0, clone.Width, clone.Height));\n _memoryBitmap = clone;\n }\n }\n Width = _memoryBitmap.Width;\n Height = _memoryBitmap.Height;\n var rect = new Rectangle(0, 0, _memoryBitmap.Width, _memoryBitmap.Height);\n try\n {\n _bmpData = _memoryBitmap.LockBits(rect, ImageLockMode.ReadWrite, _memoryBitmap.PixelFormat);\n }\n catch (Exception ex)\n {\n throw new Exception(\"Could not lock bitmap\", ex.InnerException);\n }\n _depth = Image.GetPixelFormatSize(_bmpData.PixelFormat) \/ 8;\n _pfp = (byte*) _bmpData.Scan0.ToPointer();\n _stride = _bmpData.Stride;\n }\n public int Width\n {\n get;\n }\n public int Height\n {\n get;\n }\n public void Dispose()\n {\n Dispose(true);\n GC.SuppressFinalize(this);\n }\n public void ConvertFormat(PixelFormat newPf)\n {\n var clone = new Bitmap(_memoryBitmap.Width, _memoryBitmap.Height, newPf);\n using (var gr = Graphics.FromImage(clone))\n {\n gr.DrawImage(_memoryBitmap, new Rectangle(0, 0, clone.Width, clone.Height));\n _memoryBitmap = clone;\n }\n }\n public void Save(string path)\n {\n _memoryBitmap.Save(path);\n }\n protected virtual void Dispose(bool disposing)\n {\n if (!disposing)\n return;\n if (_memoryBitmap != null)\n _memoryBitmap.UnlockBits(_bmpData);\n }\n private byte* PixelPointer(int x, int y)\n {\n return _pfp + y * _stride + x * _depth;\n }\n public Color GetPixel(int x, int y)\n {\n if (x < 0 || y < 0 || x >= Width || y >= Height)\n throw new Exception(\"Coordinates out of range\");\n int a, r, g, b;\n var p = PixelPointer(x, y);\n if (_memoryBitmap.PixelFormat == PixelFormat.Format32bppArgb)\n {\n b = *p++;\n g = *p++;\n r = *p++;\n a = *p;\n return Color.FromArgb(a, r, g, b);\n }\n if (_memoryBitmap.PixelFormat == PixelFormat.Format24bppRgb)\n {\n b = *p++;\n g = *p++;\n r = *p;\n return Color.FromArgb(r, g, b);\n }\n if (_memoryBitmap.PixelFormat == PixelFormat.Format8bppIndexed)\n {\n a = *p;\n return Color.FromArgb(a, a, a);\n }\n return default;\n }\n public void SetPixel(int x, int y, Color col)\n {\n if (x < 0 || y < 0 || x >= Width || y >= Height)\n throw new Exception(\"Coordinates out of range\");\n var p = PixelPointer(x, y);\n if (_memoryBitmap.PixelFormat == PixelFormat.Format32bppArgb)\n {\n *p++ = col.B;\n *p++ = col.G;\n *p++ = col.R;\n *p = col.A;\n return;\n }\n if (_memoryBitmap.PixelFormat == PixelFormat.Format24bppRgb)\n {\n *p++ = col.B;\n *p++ = col.G;\n *p = col.R;\n return;\n }\n if (_memoryBitmap.PixelFormat == PixelFormat.Format8bppIndexed)\n *p = col.B;\n }\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"Direct Access Pixel Data, GetPixel, SetPixel<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/posts\/48"}],"collection":[{"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/comments?post=48"}],"version-history":[{"count":1,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/posts\/48\/revisions"}],"predecessor-version":[{"id":49,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/posts\/48\/revisions\/49"}],"wp:attachment":[{"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/media?parent=48"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/categories?post=48"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/michaeljohnsteiner.com\/index.php\/wp-json\/wp\/v2\/tags?post=48"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}