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Back to using BlurHasher but not linked yet

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Mike Phares
2023-06-11 00:37:14 -07:00
parent 9c4767d454
commit f4b5a3a47c
15 changed files with 136 additions and 123 deletions
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28
BlurHash.Core/Core.cs
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@ -12,8 +12,9 @@ public static class Core
/// <param name="componentsY">The number of components used on the Y-Axis for the DCT</param>
/// <param name="progressCallback">An optional progress handler to receive progress updates</param>
/// <returns>The resulting BlurHash string</returns>
public static string Encode(Pixel[,] pixels, int componentsX, int componentsY, IProgress<int>? progressCallback = null)
public static ReadOnlySpan<char> Encode(Pixel[,] pixels, int componentsX, int componentsY, IProgress<int>? progressCallback = null)
{
Span<char> results = new char[4 + 2 * componentsX * componentsY];
if (componentsX < 1)
throw new ArgumentException("componentsX needs to be at least 1");
if (componentsX > 9)
@ -119,13 +120,14 @@ public static class Core
EncodeAc(factors[factorIndex].Red, factors[factorIndex].Green, factors[factorIndex].Blue, maximumValue).EncodeBase83(resultBuffer.Slice(6 + (factorIndex - 1) * 2, 2));
}
return resultBuffer.ToString();
resultBuffer.CopyTo(results);
return results;
}
/// <summary>
/// Decodes a BlurHash string into a 2-dimensional array of pixels
/// </summary>
/// <param name="blurhash">The blurhash string to decode</param>
/// <param name="blurHash">The blurHash string to decode</param>
/// <param name="pixels">
/// A two-dimensional array that will be filled with the pixel data.<br />
/// First dimension is the width, second dimension is the height
@ -133,30 +135,28 @@ public static class Core
/// <param name="punch">A value that affects the contrast of the decoded image. 1 means normal, smaller values will make the effect more subtle, and larger values will make it stronger.</param>
/// <param name="progressCallback">An optional progress handler to receive progress updates</param>
/// <returns>A 2-dimensional array of <see cref="Pixel"/>s </returns>
public static void Decode(string blurhash, Pixel[,] pixels, double punch = 1.0, IProgress<int>? progressCallback = null)
public static void Decode(ReadOnlySpan<char> blurHash, Pixel[,] pixels, double punch = 1.0, IProgress<int>? progressCallback = null)
{
if (blurhash.Length < 6)
if (blurHash.Length < 6)
{
throw new ArgumentException("BlurHash value needs to be at least 6 characters", nameof(blurhash));
throw new ArgumentException("BlurHash value needs to be at least 6 characters", nameof(blurHash));
}
ReadOnlySpan<char> blurhashSpan = blurhash.AsSpan();
int outputWidth = pixels.GetLength(0);
int outputHeight = pixels.GetLength(1);
int sizeFlag = blurhashSpan[..1].DecodeBase83();
int sizeFlag = blurHash[..1].DecodeBase83();
int componentsY = sizeFlag / 9 + 1;
int componentsX = sizeFlag % 9 + 1;
int componentCount = componentsX * componentsY;
if (blurhash.Length != 4 + 2 * componentsX * componentsY)
if (blurHash.Length != 4 + 2 * componentsX * componentsY)
{
throw new ArgumentException("BlurHash value is missing data", nameof(blurhash));
throw new ArgumentException("BlurHash value is missing data", nameof(blurHash));
}
double quantizedMaximumValue = blurhashSpan.Slice(1, 1).DecodeBase83();
double quantizedMaximumValue = blurHash.Slice(1, 1).DecodeBase83();
double maximumValue = (quantizedMaximumValue + 1.0) / 166.0;
Pixel[,] coefficients = new Pixel[componentsX, componentsY];
@ -167,12 +167,12 @@ public static class Core
{
if (xComponent == 0 && yComponent == 0)
{
int value = blurhashSpan.Slice(2, 4).DecodeBase83();
int value = blurHash.Slice(2, 4).DecodeBase83();
coefficients[xComponent, yComponent] = DecodeDc(value);
}
else
{
int value = blurhashSpan.Slice(4 + componentIndex * 2, 2).DecodeBase83();
int value = blurHash.Slice(4 + componentIndex * 2, 2).DecodeBase83();
coefficients[xComponent, yComponent] = DecodeAc(value, maximumValue * punch);
}