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swhardenswharden
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project describing fast bitmap access
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‎projects/18-01-10_fast_pixel_bitmap/WindowsFormsApp1/WindowsFormsApp1.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 15
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VisualStudioVersion = 15.0.26430.14
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "application", "WindowsFormsApp1\application.csproj", "{A05F14CE-25EA-4BAD-AE61-E282C2331D78}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{A05F14CE-25EA-4BAD-AE61-E282C2331D78}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{A05F14CE-25EA-4BAD-AE61-E282C2331D78}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{A05F14CE-25EA-4BAD-AE61-E282C2331D78}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{A05F14CE-25EA-4BAD-AE61-E282C2331D78}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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EndGlobal

‎projects/18-01-10_fast_pixel_bitmap/WindowsFormsApp1/WindowsFormsApp1/App.config‎

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<?xml version="1.0" encoding="utf-8" ?>
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<configuration>
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<startup>
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<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
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</startup>
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</configuration>

‎projects/18-01-10_fast_pixel_bitmap/WindowsFormsApp1/WindowsFormsApp1/Form1.Designer.cs‎

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‎projects/18-01-10_fast_pixel_bitmap/WindowsFormsApp1/WindowsFormsApp1/Form1.cs‎

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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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using System.Drawing.Imaging;
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using System.Runtime.InteropServices;
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namespace WindowsFormsApp1
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{
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public partial class Form1 : Form
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{
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public Form1()
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{
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InitializeComponent();
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}
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/// <summary>
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/// this method puts pixel values into memory and is slower (~99ms)
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/// </summary>
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private void btn_putPixel_Click(object sender, EventArgs e)
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{
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Random rand = new Random();
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var watch = System.Diagnostics.Stopwatch.StartNew();
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int width = pictureBox1.Width;
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int height = pictureBox1.Height;
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Bitmap buffer = new Bitmap(width, height);
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for (int x = 0; x < width; x++)
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{
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for (int y = 0; y < height; y++)
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{
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Color NewPixel = Color.FromArgb(255, rand.Next(255), rand.Next(255), rand.Next(255));
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buffer.SetPixel(x, y, NewPixel);
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}
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}
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pictureBox1.Image = buffer;
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label4.Text = string.Format("putPixel method took {0} ms", watch.ElapsedMilliseconds);
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}
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/// <summary>
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/// this method puts pixel values into memory and is faster (~6ms)
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/// </summary>
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private void btn_fast_Click(object sender, EventArgs e)
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{
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Random rand = new Random();
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var watch = System.Diagnostics.Stopwatch.StartNew();
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int width = pictureBox1.Width;
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int height = pictureBox1.Height;
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Bitmap buffer = new Bitmap(width, height);
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BitmapData bitmapData = buffer.LockBits(new Rectangle(0, 0, buffer.Width, buffer.Height), ImageLockMode.ReadWrite, buffer.PixelFormat);
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int bytesPerPixel = Bitmap.GetPixelFormatSize(buffer.PixelFormat) / 8;
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int byteCount = bitmapData.Stride * buffer.Height;
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byte[] pixels = new byte[byteCount];
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IntPtr ptrFirstPixel = bitmapData.Scan0;
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Marshal.Copy(ptrFirstPixel, pixels, 0, pixels.Length);
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int heightInPixels = bitmapData.Height;
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int widthInBytes = bitmapData.Width * bytesPerPixel;
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for (int y = 0; y < heightInPixels; y++)
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{
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int currentLine = y * bitmapData.Stride;
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for (int x = 0; x < widthInBytes; x = x + bytesPerPixel)
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{
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pixels[currentLine + x] = (byte)rand.Next(255);
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pixels[currentLine + x + 1] = (byte)rand.Next(255);
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pixels[currentLine + x + 2] = (byte)rand.Next(255);
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pixels[currentLine + x + 3] = 255; // alpha
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}
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}
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Marshal.Copy(pixels, 0, ptrFirstPixel, pixels.Length);
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buffer.UnlockBits(bitmapData);
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pictureBox1.Image = buffer;
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label4.Text = string.Format("faster method took {0} ms", watch.ElapsedMilliseconds);
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}
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}
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}

‎projects/18-01-10_fast_pixel_bitmap/WindowsFormsApp1/WindowsFormsApp1/Form1.resx‎

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<?xml version="1.0" encoding="utf-8"?>
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<root>
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<!--
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Microsoft ResX Schema
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Version 2.0
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The primary goals of this format is to allow a simple XML format
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that is mostly human readable. The generation and parsing of the
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various data types are done through the TypeConverter classes
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associated with the data types.
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Example:
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... ado.net/XML headers & schema ...
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<resheader name="resmimetype">text/microsoft-resx</resheader>
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<resheader name="version">2.0</resheader>
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<resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
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<resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
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<data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
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<data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
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<data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
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<value>[base64 mime encoded serialized .NET Framework object]</value>
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</data>
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<data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
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<value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
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<comment>This is a comment</comment>
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</data>
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There are any number of "resheader" rows that contain simple
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name/value pairs.
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Each data row contains a name, and value. The row also contains a
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type or mimetype. Type corresponds to a .NET class that support
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text/value conversion through the TypeConverter architecture.
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Classes that don't support this are serialized and stored with the
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mimetype set.
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The mimetype is used for serialized objects, and tells the
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ResXResourceReader how to depersist the object. This is currently not
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extensible. For a given mimetype the value must be set accordingly:
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Note - application/x-microsoft.net.object.binary.base64 is the format
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that the ResXResourceWriter will generate, however the reader can
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read any of the formats listed below.
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mimetype: application/x-microsoft.net.object.binary.base64
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value : The object must be serialized with
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: System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
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: and then encoded with base64 encoding.
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mimetype: application/x-microsoft.net.object.soap.base64
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value : The object must be serialized with
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: System.Runtime.Serialization.Formatters.Soap.SoapFormatter
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: and then encoded with base64 encoding.
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mimetype: application/x-microsoft.net.object.bytearray.base64
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value : The object must be serialized into a byte array
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: using a System.ComponentModel.TypeConverter
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: and then encoded with base64 encoding.
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-->
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<xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
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<xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
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<xsd:element name="root" msdata:IsDataSet="true">
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<xsd:complexType>
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<xsd:choice maxOccurs="unbounded">
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<xsd:element name="metadata">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" />
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</xsd:sequence>
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<xsd:attribute name="name" use="required" type="xsd:string" />
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<xsd:attribute name="type" type="xsd:string" />
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<xsd:attribute name="mimetype" type="xsd:string" />
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<xsd:attribute ref="xml:space" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="assembly">
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<xsd:complexType>
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<xsd:attribute name="alias" type="xsd:string" />
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<xsd:attribute name="name" type="xsd:string" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="data">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
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<xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
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</xsd:sequence>
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<xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
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<xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
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<xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
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<xsd:attribute ref="xml:space" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="resheader">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
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</xsd:sequence>
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<xsd:attribute name="name" type="xsd:string" use="required" />
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</xsd:complexType>
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</xsd:element>
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</xsd:choice>
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</xsd:complexType>
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</xsd:element>
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</xsd:schema>
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<resheader name="resmimetype">
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<value>text/microsoft-resx</value>
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</resheader>
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<resheader name="version">
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<value>2.0</value>
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</resheader>
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<resheader name="reader">
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<value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
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</resheader>
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<resheader name="writer">
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<value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
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</resheader>
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</root>

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