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ImageSharp
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Optimize Rotate and Skew

pull/221/head
James Jackson-South 9 years ago
parent
e8b11042f3
commit
c407d99a86
2 changed files with 62 additions and 66 deletions
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  1. 94
      src/ImageSharp/Processing/Processors/Transforms/RotateProcessor.cs
  2. 34
      src/ImageSharp/Processing/Processors/Transforms/SkewProcessor.cs

94
src/ImageSharp/Processing/Processors/Transforms/RotateProcessor.cs
View File

@ -8,7 +8,7 @@ namespace ImageSharp.Processing.Processors
using System;
using System.Numerics;
using System.Threading.Tasks;
using ImageSharp.Memory;
using ImageSharp.PixelFormats;
/// <summary>
@ -45,26 +45,26 @@ namespace ImageSharp.Processing.Processors
int width = this.CanvasRectangle.Width;
Matrix3x2 matrix = this.GetCenteredMatrix(source, this.processMatrix);
using (PixelAccessor<TPixel> targetPixels = new PixelAccessor<TPixel>(width, height))
using (var targetPixels = new PixelAccessor<TPixel>(width, height))
{
using (PixelAccessor<TPixel> sourcePixels = source.Lock())
{
Parallel.For(
0,
height,
this.ParallelOptions,
y =>
Parallel.For(
0,
height,
this.ParallelOptions,
y =>
{
Span<TPixel> targetRow = targetPixels.GetRowSpan(y);
for (int x = 0; x < width; x++)
{
for (int x = 0; x < width; x++)
var transformedPoint = Point.Rotate(new Point(x, y), matrix);
if (source.Bounds.Contains(transformedPoint.X, transformedPoint.Y))
{
Point transformedPoint = Point.Rotate(new Point(x, y), matrix);
if (source.Bounds.Contains(transformedPoint.X, transformedPoint.Y))
{
targetPixels[x, y] = sourcePixels[transformedPoint.X, transformedPoint.Y];
}
targetRow[x] = source[transformedPoint.X, transformedPoint.Y];
}
});
}
}
});
source.SwapPixelsBuffers(targetPixels);
}
@ -128,7 +128,7 @@ namespace ImageSharp.Processing.Processors
int width = source.Width;
int height = source.Height;
using (PixelAccessor<TPixel> targetPixels = new PixelAccessor<TPixel>(height, width))
using (var targetPixels = new PixelAccessor<TPixel>(height, width))
{
using (PixelAccessor<TPixel> sourcePixels = source.Lock())
{
@ -161,24 +161,22 @@ namespace ImageSharp.Processing.Processors
int width = source.Width;
int height = source.Height;
using (PixelAccessor<TPixel> targetPixels = new PixelAccessor<TPixel>(width, height))
using (var targetPixels = new PixelAccessor<TPixel>(width, height))
{
using (PixelAccessor<TPixel> sourcePixels = source.Lock())
{
Parallel.For(
0,
height,
this.ParallelOptions,
y =>
Parallel.For(
0,
height,
this.ParallelOptions,
y =>
{
Span<TPixel> sourceRow = source.GetRowSpan(y);
Span<TPixel> targetRow = targetPixels.GetRowSpan(height - y - 1);
for (int x = 0; x < width; x++)
{
for (int x = 0; x < width; x++)
{
int newX = width - x - 1;
int newY = height - y - 1;
targetPixels[newX, newY] = sourcePixels[x, y];
}
});
}
targetRow[width - x - 1] = sourceRow[x];
}
});
source.SwapPixelsBuffers(targetPixels);
}
@ -193,23 +191,21 @@ namespace ImageSharp.Processing.Processors
int width = source.Width;
int height = source.Height;
using (PixelAccessor<TPixel> targetPixels = new PixelAccessor<TPixel>(height, width))
using (var targetPixels = new PixelAccessor<TPixel>(height, width))
{
using (PixelAccessor<TPixel> sourcePixels = source.Lock())
{
Parallel.For(
0,
height,
this.ParallelOptions,
y =>
Parallel.For(
0,
height,
this.ParallelOptions,
y =>
{
Span<TPixel> sourceRow = source.GetRowSpan(y);
int newX = height - y - 1;
for (int x = 0; x < width; x++)
{
for (int x = 0; x < width; x++)
{
int newX = height - y - 1;
targetPixels[newX, x] = sourcePixels[x, y];
}
});
}
targetPixels[newX, x] = sourceRow[x];
}
});
source.SwapPixelsBuffers(targetPixels);
}

34
src/ImageSharp/Processing/Processors/Transforms/SkewProcessor.cs
View File

@ -8,7 +8,7 @@ namespace ImageSharp.Processing.Processors
using System;
using System.Numerics;
using System.Threading.Tasks;
using ImageSharp.Memory;
using ImageSharp.PixelFormats;
/// <summary>
@ -45,26 +45,26 @@ namespace ImageSharp.Processing.Processors
int width = this.CanvasRectangle.Width;
Matrix3x2 matrix = this.GetCenteredMatrix(source, this.processMatrix);
using (PixelAccessor<TPixel> targetPixels = new PixelAccessor<TPixel>(width, height))
using (var targetPixels = new PixelAccessor<TPixel>(width, height))
{
using (PixelAccessor<TPixel> sourcePixels = source.Lock())
{
Parallel.For(
0,
height,
this.ParallelOptions,
y =>
Parallel.For(
0,
height,
this.ParallelOptions,
y =>
{
Span<TPixel> targetRow = targetPixels.GetRowSpan(y);
for (int x = 0; x < width; x++)
{
for (int x = 0; x < width; x++)
var transformedPoint = Point.Skew(new Point(x, y), matrix);
if (source.Bounds.Contains(transformedPoint.X, transformedPoint.Y))
{
Point transformedPoint = Point.Skew(new Point(x, y), matrix);
if (source.Bounds.Contains(transformedPoint.X, transformedPoint.Y))
{
targetPixels[x, y] = sourcePixels[transformedPoint.X, transformedPoint.Y];
}
targetRow[x] = source[transformedPoint.X, transformedPoint.Y];
}
});
}
}
});
source.SwapPixelsBuffers(targetPixels);
}

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