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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,165 +1,164 @@ | ||
| using SkiaSharp; | ||
| using System; | ||
| using System.Runtime.CompilerServices; | ||
|
|
||
| [assembly: System.Runtime.CompilerServices.InternalsVisibleTo("PDFtoZPL.WebConverter, PublicKey=0024000004800000940000000602000000240000525341310004000001000100fd0018feed1ba4fac91744d868cb1bb8a4b55a97eec0e02e90a8d57db56bff5a32f03813b1a6c8a7ccd50eed8880be4e91ad281c9ee81fd4182de0905c0590019e9bf87a8f83ce93c09da9c4eaae5bd8aa63816c4a3bef8bd16bb358d3aed64cc2ec3ae17698c336b63df4fbd719dc13bd9a88d9fcfa87a2426d34db78d05fb7")] | ||
|
|
||
| namespace PDFtoZPL | ||
| { | ||
| internal static class DitheringUtils | ||
| { | ||
| private static readonly uint _black = (uint)new SKColor(0, 0, 0, 255); | ||
| private static readonly uint _white = (uint)new SKColor(255, 255, 255, 255); | ||
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| public static SKBitmap ToMonochrome(this SKBitmap input, byte threshold = 128, DitheringKind dithering = DitheringKind.None) | ||
| { | ||
| var width = input.Width; | ||
| var height = input.Height; | ||
|
|
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| var output = input.Copy(SKColorType.Rgba8888); | ||
|
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| IntPtr pixelsAddr = output.GetPixels(); | ||
|
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||
| unsafe | ||
| { | ||
| unchecked | ||
| { | ||
| uint* ptr = (uint*)pixelsAddr.ToPointer(); | ||
|
|
||
| for (int row = 0; row < height; row++) | ||
| { | ||
| for (int col = 0; col < width; col++) | ||
| { | ||
| uint oldPixel = *ptr; | ||
|
|
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| uint sum = oldPixel % 256; | ||
| sum += (oldPixel >> 8) % 256; | ||
| sum += (oldPixel >> 16) % 256; | ||
|
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| uint newPixel = (sum / 3) < threshold | ||
| ? _black | ||
| : _white; | ||
|
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| *ptr = newPixel; | ||
|
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||
| if (dithering == DitheringKind.FloydSteinberg) | ||
| { | ||
| DitherFloydSteinberg(oldPixel, newPixel, row, col, width, height, ptr); | ||
| } | ||
| else if (dithering == DitheringKind.Atkinson) | ||
| { | ||
| DitherAtkinson(oldPixel, newPixel, row, col, width, height, ptr); | ||
| } | ||
| else if (dithering != DitheringKind.None) | ||
| { | ||
| throw new ArgumentOutOfRangeException(nameof(dithering)); | ||
| } | ||
|
|
||
| ptr++; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
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| return output; | ||
| } | ||
|
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||
| [MethodImpl(MethodImplOptions.AggressiveInlining)] | ||
| private static byte HandleByteError(byte input, int error) | ||
| { | ||
| if ((input & 0xff) + error < 0) | ||
| return 0; | ||
|
|
||
| else if ((input & 0xff) + error > 255) | ||
| return 255; | ||
|
|
||
| return (byte)(input + error); | ||
| } | ||
|
|
||
| [MethodImpl(MethodImplOptions.AggressiveInlining)] | ||
| private static uint HandlePixel(uint input, int red, int green, int blue) | ||
| { | ||
| uint result = HandleByteError((byte)(input % 256), red); | ||
| result += (uint)HandleByteError((byte)((input >> 8) % 256), green) << 8; | ||
| result += (uint)HandleByteError((byte)((input >> 16) % 256), blue) << 16; | ||
| result += 0xFF000000; | ||
|
|
||
| return result; | ||
| } | ||
|
|
||
| private static unsafe void DitherFloydSteinberg(uint oldPixel, uint newPixel, int row, int col, int width, int height, uint* ptr) | ||
| { | ||
| int errorR = ((byte)(oldPixel % 256)) - ((byte)(newPixel % 256)); | ||
| int errorG = ((byte)((oldPixel >> 8) % 256)) - ((byte)((newPixel >> 8) % 256)); | ||
| int errorB = ((byte)((oldPixel >> 16) % 256)) - ((byte)((newPixel >> 16) % 256)); | ||
|
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| bool left = col != 0; | ||
| bool right = col != (width - 1); | ||
| bool below = row != (height - 1); | ||
|
|
||
| if (right) | ||
| { | ||
| *(ptr+1) = HandlePixel(*(ptr+1), (errorR * 7) >> 4, (errorG * 7) >> 4, (errorB * 7) >> 4); | ||
|
|
||
| if (below) | ||
| { | ||
| *(ptr+1+width) = HandlePixel(*(ptr+1+width), (errorR * 1) >> 4, (errorG * 1) >> 4, (errorB * 1) >> 4); | ||
| } | ||
| } | ||
|
|
||
| if (below) | ||
| { | ||
| *(ptr+width) = HandlePixel(*(ptr+width), (errorR * 5) >> 4, (errorG * 5) >> 4, (errorB * 5) >> 4); | ||
|
|
||
| if (left) | ||
| { | ||
| *(ptr-1+width) = HandlePixel(*(ptr-1+width), (errorR * 3) >> 4, (errorG * 3) >> 4, (errorB * 3) >> 4); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private static unsafe void DitherAtkinson(uint oldPixel, uint newPixel, int row, int col, int width, int height, uint* ptr) | ||
| { | ||
| int errorR = ((byte)(oldPixel % 256)) - ((byte)(newPixel % 256)); | ||
| int errorG = ((byte)((oldPixel >> 8) % 256)) - ((byte)((newPixel >> 8) % 256)); | ||
| int errorB = ((byte)((oldPixel >> 16) % 256)) - ((byte)((newPixel >> 16) % 256)); | ||
|
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| bool left = col != 0; | ||
| bool right = col != (width - 1); | ||
| bool right2 = right && col != (width - 2); | ||
| bool below = row != (height - 1); | ||
| bool below2 = below && row != (height - 2); | ||
|
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||
| if (right) | ||
| { | ||
| *(ptr+1) = HandlePixel(*(ptr+1), errorR >> 3, errorG >> 3, errorB >> 3); | ||
|
|
||
| if (below) | ||
| { | ||
| *(ptr+1+width) = HandlePixel(*(ptr+1+width), errorR >> 3, errorG >> 3, errorB >> 3); | ||
| } | ||
| } | ||
|
|
||
| if (below) | ||
| { | ||
| *(ptr+width) = HandlePixel(*(ptr+width), errorR >> 3, errorG >> 3, errorB >> 3); | ||
|
|
||
| if (left) | ||
| { | ||
| *(ptr-1+width) = HandlePixel(*(ptr-1+width), errorR >> 3, errorG >> 3, errorB >> 3); | ||
| } | ||
| } | ||
|
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||
| if (right2) | ||
| { | ||
| *(ptr+2) = HandlePixel(*(ptr+2), errorR >> 3, errorG >> 3, errorB >> 3); | ||
| } | ||
|
|
||
| if (below2) | ||
| { | ||
| *(ptr+width*2) = HandlePixel(*(ptr+width*2), errorR >> 3, errorG >> 3, errorB >> 3); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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