mirror of https://github.com/SixLabors/ImageSharp
James Jackson-South
3 months ago
867 changed files with 10924 additions and 6868 deletions
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// Copyright (c) Six Labors.
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// Licensed under the Six Labors Split License.
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namespace SixLabors.ImageSharp; |
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/// <summary>
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/// Specifies the channel order when formatting or parsing a color as a hexadecimal string.
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/// </summary>
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public enum ColorHexFormat |
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{ |
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/// <summary>
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/// Uses <c>RRGGBBAA</c> channel order where the red, green, and blue components come first,
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/// followed by the alpha component. This matches the CSS Color Module Level 4 and common web standards.
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/// <para>
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/// When parsing, supports the following formats:
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/// <list type="bullet">
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/// <item><description><c>#RGB</c> expands to <c>RRGGBBFF</c> (fully opaque)</description></item>
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/// <item><description><c>#RGBA</c> expands to <c>RRGGBBAA</c></description></item>
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/// <item><description><c>#RRGGBB</c> expands to <c>RRGGBBFF</c> (fully opaque)</description></item>
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/// <item><description><c>#RRGGBBAA</c> used as-is</description></item>
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/// </list>
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/// </para>
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/// When formatting, outputs an 8-digit hex string in <c>RRGGBBAA</c> order.
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/// </summary>
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Rgba, |
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/// <summary>
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/// Uses <c>AARRGGBB</c> channel order where the alpha component comes first,
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/// followed by the red, green, and blue components. This matches the Microsoft/XAML convention.
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/// <para>
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/// When parsing, supports the following formats:
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/// <list type="bullet">
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/// <item><description><c>#ARGB</c> expands to <c>AARRGGBB</c></description></item>
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/// <item><description><c>#AARRGGBB</c> used as-is</description></item>
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/// </list>
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/// </para>
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/// When formatting, outputs an 8-digit hex string in <c>AARRGGBB</c> order.
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/// </summary>
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Argb |
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} |
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// Copyright (c) Six Labors.
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// Licensed under the Six Labors Split License.
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using System.Buffers; |
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using System.Numerics; |
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using System.Runtime.CompilerServices; |
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using System.Runtime.InteropServices; |
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using System.Runtime.Intrinsics; |
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using System.Runtime.Intrinsics.X86; |
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using SixLabors.ImageSharp.PixelFormats; |
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using SixLabors.ImageSharp.Processing; |
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namespace SixLabors.ImageSharp.ColorProfiles; |
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internal static class ColorProfileConverterExtensionsPixelCompatible |
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{ |
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/// <summary>
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/// Converts the pixel data of the specified image from the source color profile to the target color profile using
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/// the provided color profile converter.
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/// </summary>
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/// <remarks>
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/// This method modifies the source image in place by converting its pixel data according to the
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/// color profiles specified in the converter. The method does not verify whether the profiles are RGB compatible;
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/// if they are not, the conversion may produce incorrect results. Ensure that both the source and target ICC
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/// profiles are set on the converter before calling this method.
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/// </remarks>
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/// <typeparam name="TPixel">The pixel format.</typeparam>
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/// <param name="converter">The color profile converter configured with source and target ICC profiles.</param>
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/// <param name="source">
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/// The image whose pixel data will be converted. The conversion is performed in place, modifying the original
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/// image.
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/// </param>
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/// <exception cref="InvalidOperationException">
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/// Thrown if the converter's source or target ICC profile is not specified.
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/// </exception>
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public static void Convert<TPixel>(this ColorProfileConverter converter, Image<TPixel> source) |
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where TPixel : unmanaged, IPixel<TPixel> |
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{ |
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// These checks actually take place within the converter, but we want to fail fast here.
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// Note. we do not check to see whether the profiles themselves are RGB compatible,
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// if they are not, then the converter will simply produce incorrect results.
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if (converter.Options.SourceIccProfile is null) |
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{ |
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throw new InvalidOperationException("Source ICC profile is missing."); |
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} |
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if (converter.Options.TargetIccProfile is null) |
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{ |
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throw new InvalidOperationException("Target ICC profile is missing."); |
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} |
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// Process the rows in parallel chunks, the converter itself is thread safe.
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source.Mutate(o => o.ProcessPixelRowsAsVector4( |
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row => |
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{ |
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// Gather and convert the pixels in the row to Rgb.
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using IMemoryOwner<Rgb> rgbBuffer = converter.Options.MemoryAllocator.Allocate<Rgb>(row.Length); |
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Span<Rgb> rgbSpan = rgbBuffer.Memory.Span; |
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Rgb.FromScaledVector4(row, rgbSpan); |
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// Perform the actual color conversion.
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converter.ConvertUsingIccProfile<Rgb, Rgb>(rgbSpan, rgbSpan); |
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// Copy the converted Rgb pixels back to the row as TPixel.
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// Important: Preserve alpha from the existing row Vector4 values.
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// We merge RGB from rgbSpan into row, leaving W untouched.
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ref float srcRgb = ref Unsafe.As<Rgb, float>(ref MemoryMarshal.GetReference(rgbSpan)); |
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ref float dstRow = ref Unsafe.As<Vector4, float>(ref MemoryMarshal.GetReference(row)); |
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int count = rgbSpan.Length; |
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int i = 0; |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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static Vector512<float> ReadVector512(ref float f) |
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{ |
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ref byte b = ref Unsafe.As<float, byte>(ref f); |
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return Unsafe.ReadUnaligned<Vector512<float>>(ref b); |
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} |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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static void WriteVector512(ref float f, Vector512<float> v) |
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{ |
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ref byte b = ref Unsafe.As<float, byte>(ref f); |
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Unsafe.WriteUnaligned(ref b, v); |
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} |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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static Vector256<float> ReadVector256(ref float f) |
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{ |
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ref byte b = ref Unsafe.As<float, byte>(ref f); |
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return Unsafe.ReadUnaligned<Vector256<float>>(ref b); |
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} |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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static void WriteVector256(ref float f, Vector256<float> v) |
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{ |
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ref byte b = ref Unsafe.As<float, byte>(ref f); |
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Unsafe.WriteUnaligned(ref b, v); |
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} |
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if (Avx512F.IsSupported) |
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{ |
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// 4 pixels per iteration.
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//
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// Source layout (Rgb float stream, 12 floats):
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// [r0 g0 b0 r1 g1 b1 r2 g2 b2 r3 g3 b3]
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//
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// Destination layout (row Vector4 float stream, 16 floats):
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// [r0 g0 b0 a0 r1 g1 b1 a1 r2 g2 b2 a2 r3 g3 b3 a3]
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//
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// We use an overlapped load (16 floats) from the 3-float stride source.
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// The permute selects the RGB we need and inserts placeholders for alpha lanes.
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//
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// Then we blend RGB lanes into the existing destination, preserving alpha lanes.
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Vector512<int> rgbPerm = Vector512.Create(0, 1, 2, 0, 3, 4, 5, 0, 6, 7, 8, 0, 9, 10, 11, 0); |
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// BlendVariable selects from the second operand where the sign bit of the mask lane is set.
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// We want to overwrite lanes 0,1,2 then 4,5,6 then 8,9,10 then 12,13,14, and preserve lanes 3,7,11,15 (alpha).
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Vector512<float> rgbSelect = Vector512.Create(-0F, -0F, -0F, 0F, -0F, -0F, -0F, 0F, -0F, -0F, -0F, 0F, -0F, -0F, -0F, 0F); |
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int quads = count >> 2; |
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int simdQuads = quads - 1; // Leave the last quad for the scalar tail to avoid the final overlapped load reading past the end.
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for (int q = 0; q < simdQuads; q++) |
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{ |
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Vector512<float> dst = ReadVector512(ref dstRow); |
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Vector512<float> src = ReadVector512(ref srcRgb); |
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Vector512<float> rgbx = Avx512F.PermuteVar16x32(src, rgbPerm); |
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Vector512<float> merged = Avx512F.BlendVariable(dst, rgbx, rgbSelect); |
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WriteVector512(ref dstRow, merged); |
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// Advance input by 4 pixels (4 * 3 = 12 floats)
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srcRgb = ref Unsafe.Add(ref srcRgb, 12); |
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// Advance output by 4 pixels (4 * 4 = 16 floats)
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dstRow = ref Unsafe.Add(ref dstRow, 16); |
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i += 4; |
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} |
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} |
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else if (Avx2.IsSupported) |
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{ |
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// 2 pixels per iteration.
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//
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// Same idea as AVX-512, but on 256-bit vectors.
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// We permute packed RGB into rgbx layout and blend into the existing destination,
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// preserving alpha lanes.
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Vector256<int> rgbPerm = Vector256.Create(0, 1, 2, 0, 3, 4, 5, 0); |
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Vector256<float> rgbSelect = Vector256.Create(-0F, -0F, -0F, 0F, -0F, -0F, -0F, 0F); |
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int pairs = count >> 1; |
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int simdPairs = pairs - 1; // Leave the last pair for the scalar tail to avoid the final overlapped load reading past the end.
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for (int p = 0; p < simdPairs; p++) |
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{ |
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Vector256<float> dst = ReadVector256(ref dstRow); |
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Vector256<float> src = ReadVector256(ref srcRgb); |
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Vector256<float> rgbx = Avx2.PermuteVar8x32(src, rgbPerm); |
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Vector256<float> merged = Avx.BlendVariable(dst, rgbx, rgbSelect); |
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WriteVector256(ref dstRow, merged); |
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// Advance input by 2 pixels (2 * 3 = 6 floats)
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srcRgb = ref Unsafe.Add(ref srcRgb, 6); |
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// Advance output by 2 pixels (2 * 4 = 8 floats)
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dstRow = ref Unsafe.Add(ref dstRow, 8); |
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i += 2; |
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} |
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} |
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// Scalar tail.
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// Handles:
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// - the last skipped SIMD block (quad or pair)
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// - any remainder
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//
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// Preserve alpha by writing Vector3 into the Vector4 storage.
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ref Vector4 rowRef = ref MemoryMarshal.GetReference(row); |
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for (; i < count; i++) |
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{ |
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Vector3 rgb = rgbSpan[i].AsVector3Unsafe(); |
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Unsafe.As<Vector4, Vector3>(ref Unsafe.Add(ref rowRef, (uint)i)) = rgb; |
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} |
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}, |
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PixelConversionModifiers.Scale)); |
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} |
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} |
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