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| using System;
using System.Drawing;
using System.Drawing.Imaging;
namespace Image {
public unsafe class FastBitmap {
public struct PixelData {
public byte blue;
public byte green;
public byte red;
}
Bitmap Subject;
int SubjectWidth;
BitmapData bitmapData = null;
Byte* pBase = null;
public FastBitmap(Bitmap SubjectBitmap) {
this.Subject = SubjectBitmap;
try {
LockBitmap();
} catch (Exception ex) {
throw ex;
}
}
public void Release() {
try {
UnlockBitmap();
} catch (Exception ex) {
throw ex;
}
}
public Bitmap Bitmap {
get {
return Subject;
}
}
public void SetPixel(int X, int Y, Color Colour) {
try {
PixelData* p = PixelAt(X, Y);
p->red = Colour.R;
p->green = Colour.G;
p->blue = Colour.B;
} catch (AccessViolationException ave) {
throw (ave);
} catch (Exception ex) {
throw ex;
}
}
public Color GetPixel(int X, int Y) {
try {
PixelData* p = PixelAt(X, Y);
return Color.FromArgb((int)p->red, (int)p->green, (int)p->blue);
} catch (AccessViolationException ave) {
throw (ave);
} catch (Exception ex) {
throw ex;
}
}
private void LockBitmap() {
GraphicsUnit unit = GraphicsUnit.Pixel;
RectangleF boundsF = Subject.GetBounds(ref unit);
Rectangle bounds = new Rectangle((int)boundsF.X,
(int)boundsF.Y,
(int)boundsF.Width,
(int)boundsF.Height);
SubjectWidth = (int)boundsF.Width * sizeof(PixelData);
if (SubjectWidth % 4 != 0) {
SubjectWidth = 4 * (SubjectWidth / 4 + 1);
}
bitmapData = Subject.LockBits(bounds, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
pBase = (Byte*)bitmapData.Scan0.ToPointer();
}
private PixelData* PixelAt(int x, int y) {
return (PixelData*)(pBase + y * SubjectWidth + x * sizeof(PixelData));
}
private void UnlockBitmap() {
Subject.UnlockBits(bitmapData);
bitmapData = null;
pBase = null;
}
}
} |
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