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using System;
using System.Drawing;
using System.Drawing.Imaging;
namespace Pfz.Drawing
{
/// <summary>
/// This class holds a lock over a 32-bit argb bitmap.
/// It does bound checking but, still, is many times faster than bitmap.GetPixel and
/// bitmap.SetPixel (in my computer, 35 times faster).
/// </summary>
public sealed class LockArgb32:
IDisposable
{
private Bitmap fBitmap;
private BitmapData fBitmapData;
private unsafe byte *fScanline0;
/// <summary>
/// Creates a new ArgbLock over a bitmap.
/// </summary>
public LockArgb32(Bitmap bitmap)
{
if (bitmap == null)
throw new ArgumentNullException("bitmap");
if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
throw new ArgumentException("bitmap.PixelFormat must be Format32bppArgb.", "bitmap");
fBitmap = bitmap;
fBitmapData = fBitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
unsafe
{
fScanline0 = (byte *)fBitmapData.Scan0.ToPointer();
}
}
/// <summary>
/// Frees the lock... probably because someone forget to do so.
/// </summary>
~LockArgb32()
{
Dispose();
}
/// <summary>
/// Frees the lock immediatelly.
/// </summary>
public void Dispose()
{
unsafe
{
fScanline0 = null;
}
var bitmap = fBitmap;
var bitmapData = fBitmapData;
if (bitmapData != null)
{
fBitmapData = null;
bitmap.UnlockBits(bitmapData);
}
fBitmap = null;
GC.SuppressFinalize(this);
}
/// <summary>
/// Gets or sets a pixel as its "argb int" representation.
/// </summary>
public int this[int x, int y]
{
get
{
if (x < 0 || x >= fBitmapData.Width)
throw new ArgumentOutOfRangeException("x");
if (y < 0 || y >= fBitmapData.Height)
throw new ArgumentOutOfRangeException("y");
unsafe
{
byte *scanline = fScanline0;
if (scanline == null)
throw new ObjectDisposedException("Pfz.Drawing.ArgbLock");
scanline += fBitmapData.Stride * y;
int *typedScanline = (int *)scanline;
return typedScanline[x];
}
}
set
{
if (x < 0 || x >= fBitmapData.Width)
throw new ArgumentOutOfRangeException("x");
if (y < 0 || y >= fBitmapData.Height)
throw new ArgumentOutOfRangeException("y");
unsafe
{
byte *scanline = fScanline0;
if (scanline == null)
throw new ObjectDisposedException("Pfz.Drawing.ArgbLock");
scanline += fBitmapData.Stride * y;
int *typedScanline = (int *)scanline;
typedScanline[x] = value;
}
}
}
/// <summary>
/// Gets a pixel as a Color.
/// </summary>
public Color GetPixel(int x, int y)
{
return Color.FromArgb(this[x, y]);
}
/// <summary>
/// Sets a pixel as a Color.
/// </summary>
public void SetPixel(int x, int y, Color color)
{
this[x, y] = color.ToArgb();
}
}
}
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I started to program computers when I was 11 years old, as a hobbyist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do their work easier, faster and with less errors.
Want more info or simply want to contact me?
Take a look at:
http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
Codeproject MVP 2012, 2015 & 2016
Microsoft MVP 2013-2014 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).