/
FastBrightnessFilter.cs
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/
FastBrightnessFilter.cs
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#region License and copyright notice
/*
* Kaliko Image Library
*
* Copyright (c) Fredrik Schultz and Contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#endregion
namespace Kaliko.ImageLibrary.FastFilters {
using System.Drawing;
using System.Threading.Tasks;
using Filters;
public class FastBrightnessFilter : BrightnessFilter {
public FastBrightnessFilter(int changeInBrightness) : base(changeInBrightness) {
}
public override void Run(KalikoImage image) {
ChangeBrightness(image);
}
private void ChangeBrightness(KalikoImage image) {
var lookupTable = BuildLookupTable();
unsafe {
var bitmapData = image.LockBits();
var bytesPerPixel = Image.GetPixelFormatSize(bitmapData.PixelFormat)/8;
var height = bitmapData.Height;
var widthInBytes = bitmapData.Width*bytesPerPixel;
var startOffset = (byte*)bitmapData.Scan0;
Parallel.For(0, height, y => {
var currentLine = startOffset + (y*bitmapData.Stride);
for (var x = 0; x < widthInBytes; x = x + bytesPerPixel) {
var red = currentLine[x];
var green = currentLine[x + 1];
var blue = currentLine[x + 2];
currentLine[x] = lookupTable[red];
currentLine[x + 1] = lookupTable[green];
currentLine[x + 2] = lookupTable[blue];
}
});
image.UnlockBits(bitmapData);
}
}
}
}