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* optimized FastPixel some more (no copying of memory anymore)

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This commit is contained in:
Markus Birth 2009-01-30 23:27:11 +01:00
parent 497fd500d9
commit 6a90788777
1 changed files with 32 additions and 51 deletions
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83
FastPixel.cs
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@ -3,7 +3,6 @@ using System.Drawing;
using System.Drawing.Imaging;
class FastPixel {
private byte[] rgbValues;
private BitmapData bmpData;
private bool locked = false;
@ -38,7 +37,6 @@ class FastPixel {
this._width = bitmap.Width;
this._height = bitmap.Height;
this.bytesPerPixel = (this._isAlpha)?4:3;
this.rgbValues = new byte[(this.Width * this.Height) * this.bytesPerPixel];
}
public void Lock() {
@ -47,20 +45,6 @@ class FastPixel {
Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);
this.bmpData = this.Bitmap.LockBits(rect, ImageLockMode.ReadWrite, this.Bitmap.PixelFormat);
unsafe {
byte* ptr= (byte*)this.bmpData.Scan0;
int offset = this.bmpData.Stride - this.bmpData.Width * this.bytesPerPixel;
for(int y = 0; y < this.Height; y++, ptr += offset) {
for(int x = 0; x < this.Width; x++, ptr += this.bytesPerPixel) {
int index = ((y * this.Width + x) * this.bytesPerPixel);
this.rgbValues[index] = ptr[0];
this.rgbValues[index+1] = ptr[1];
this.rgbValues[index+2] = ptr[2];
if (this.bytesPerPixel == 4) this.rgbValues[index+3] = ptr[3];
}
}
}
this.locked = true;
}
@ -68,37 +52,24 @@ class FastPixel {
if (!this.locked)
throw new Exception("Bitmap not locked.");
// Copy the RGB values back to the bitmap;
if (setPixels) {
unsafe {
byte* ptr= (byte*)this.bmpData.Scan0;
int offset = this.bmpData.Stride - this.bmpData.Width * this.bytesPerPixel;
for(int y = 0; y < this.Height; y++, ptr += offset) {
for(int x = 0; x < this.Width; x++, ptr += this.bytesPerPixel) {
int index = ((y * this.Width + x) * this.bytesPerPixel);
ptr[0] = this.rgbValues[index];
ptr[1] = this.rgbValues[index+1];
ptr[2] = this.rgbValues[index+2];
if (this.bytesPerPixel == 4) ptr[3] = this.rgbValues[index+3];
}
}
}
}
// Unlock the bits.;
this.Bitmap.UnlockBits(bmpData);
this.locked = false;
}
public void Clear(Color colour) {
public unsafe void Clear(Color color) {
if (!this.locked)
throw new Exception("Bitmap not locked.");
for (int index = 0; index < this.rgbValues.Length; index += this.bytesPerPixel) {
this.rgbValues[index] = colour.B;
this.rgbValues[index + 1] = colour.G;
this.rgbValues[index + 2] = colour.R;
if (this.bytesPerPixel == 4) this.rgbValues[index + 3] = colour.A;
byte* ptr = (byte*)this.bmpData.Scan0;
int offset = this.bmpData.Stride - this.bmpData.Width * this.bytesPerPixel;
for(int y = 0; y < this.Height; y++, ptr += offset) {
for(int x = 0; x < this.Width; x++, ptr += this.bytesPerPixel) {
ptr[0] = color.B;
ptr[1] = color.G;
ptr[2] = color.R;
if (this.bytesPerPixel == 4) ptr[3] = color.A;
}
}
}
@ -106,33 +77,43 @@ class FastPixel {
this.SetPixel(location.X, location.Y, colour);
}
public void SetPixel(int x, int y, Color colour) {
public unsafe void SetPixel(int x, int y, Color color) {
if (!this.locked)
throw new Exception("Bitmap not locked.");
int index = ((y * this.Width + x) * this.bytesPerPixel);
this.rgbValues[index] = colour.B;
this.rgbValues[index + 1] = colour.G;
this.rgbValues[index + 2] = colour.R;
if (this.bytesPerPixel == 4) this.rgbValues[index + 3] = colour.A;
byte* ptr = (byte*)this.bmpData.Scan0;
ptr += getMemoryOffset(x, y);
ptr[0] = color.B;
ptr[1] = color.G;
ptr[2] = color.R;
if (this.bytesPerPixel == 4) ptr[3] = color.A;
}
public Color GetPixel(Point location) {
return this.GetPixel(location.X, location.Y);
}
public Color GetPixel(int x, int y) {
public unsafe Color GetPixel(int x, int y) {
if (!this.locked)
throw new Exception("Bitmap not locked.");
int index = ((y * this.Width + x) * this.bytesPerPixel);
int b = this.rgbValues[index];
int g = this.rgbValues[index + 1];
int r = this.rgbValues[index + 2];
byte* ptr = (byte*)this.bmpData.Scan0;
ptr += getMemoryOffset(x, y);
int b = ptr[0];
int g = ptr[1];
int r = ptr[2];
if (this.bytesPerPixel == 4) {
int a = this.rgbValues[index + 3];
int a = ptr[3];
return Color.FromArgb(a, r, g, b);
}
return Color.FromArgb(r, g, b);
}
protected int getMemoryOffset(int x, int y) {
// int offset = this.bmpData.Stride - this.bmpData.Width * this.bytesPerPixel;
int result = y*this.bmpData.Stride + x*this.bytesPerPixel;
return result;
}
}