diff --git a/src/ImageSharp/Advanced/AotCompilerTools.cs b/src/ImageSharp/Advanced/AotCompilerTools.cs index 0d5faabe18..c17aa76285 100644 --- a/src/ImageSharp/Advanced/AotCompilerTools.cs +++ b/src/ImageSharp/Advanced/AotCompilerTools.cs @@ -138,6 +138,7 @@ private static void Seed() AotCompileResamplers(); AotCompileQuantizers(); AotCompilePixelSamplingStrategys(); + AotCompilePixelMaps(); AotCompileDithers(); AotCompileMemoryManagers(); @@ -514,6 +515,20 @@ private static void AotCompilePixelSamplingStrategys() default(ExtensivePixelSamplingStrategy).EnumeratePixelRegions(default(ImageFrame)); } + /// + /// This method pre-seeds the all in the AoT compiler. + /// + /// The pixel format. + [Preserve] + private static void AotCompilePixelMaps() + where TPixel : unmanaged, IPixel + { + default(EuclideanPixelMap).GetClosestColor(default, out _); + default(EuclideanPixelMap).GetClosestColor(default, out _); + default(EuclideanPixelMap).GetClosestColor(default, out _); + default(EuclideanPixelMap).GetClosestColor(default, out _); + } + /// /// This method pre-seeds the all in the AoT compiler. /// diff --git a/src/ImageSharp/Formats/AnimatedImageFrameMetadata.cs b/src/ImageSharp/Formats/AnimatedImageFrameMetadata.cs index 5f4015180b..75595e1f7d 100644 --- a/src/ImageSharp/Formats/AnimatedImageFrameMetadata.cs +++ b/src/ImageSharp/Formats/AnimatedImageFrameMetadata.cs @@ -2,6 +2,7 @@ // Licensed under the Six Labors Split License. namespace SixLabors.ImageSharp.Formats; + internal class AnimatedImageFrameMetadata { /// diff --git a/src/ImageSharp/Formats/AnimatedImageMetadata.cs b/src/ImageSharp/Formats/AnimatedImageMetadata.cs index d89ec41f07..ac3ca29f4f 100644 --- a/src/ImageSharp/Formats/AnimatedImageMetadata.cs +++ b/src/ImageSharp/Formats/AnimatedImageMetadata.cs @@ -2,6 +2,7 @@ // Licensed under the Six Labors Split License. namespace SixLabors.ImageSharp.Formats; + internal class AnimatedImageMetadata { /// diff --git a/src/ImageSharp/Formats/Gif/GifDecoderCore.cs b/src/ImageSharp/Formats/Gif/GifDecoderCore.cs index 68f4e5fa2d..ad073ccbb1 100644 --- a/src/ImageSharp/Formats/Gif/GifDecoderCore.cs +++ b/src/ImageSharp/Formats/Gif/GifDecoderCore.cs @@ -89,6 +89,11 @@ internal sealed class GifDecoderCore : ImageDecoderCore /// private GifMetadata? gifMetadata; + /// + /// The background color index. + /// + private byte backgroundColorIndex; + /// /// Initializes a new instance of the class. /// @@ -108,6 +113,10 @@ protected override Image Decode(BufferedReadStream stream, Cance uint frameCount = 0; Image? image = null; ImageFrame? previousFrame = null; + GifDisposalMethod? previousDisposalMethod = null; + bool globalColorTableUsed = false; + Color backgroundColor = Color.Transparent; + try { this.ReadLogicalScreenDescriptorAndGlobalColorTable(stream); @@ -123,7 +132,7 @@ protected override Image Decode(BufferedReadStream stream, Cance break; } - this.ReadFrame(stream, ref image, ref previousFrame); + globalColorTableUsed |= this.ReadFrame(stream, ref image, ref previousFrame, ref previousDisposalMethod, ref backgroundColor); // Reset per-frame state. this.imageDescriptor = default; @@ -158,6 +167,13 @@ protected override Image Decode(BufferedReadStream stream, Cance break; } } + + // We cannot always trust the global GIF palette has actually been used. + // https://github.com/SixLabors/ImageSharp/issues/2866 + if (!globalColorTableUsed) + { + this.gifMetadata.ColorTableMode = GifColorTableMode.Local; + } } finally { @@ -417,7 +433,14 @@ private void ReadComments(BufferedReadStream stream) /// The containing image data. /// The image to decode the information to. /// The previous frame. - private void ReadFrame(BufferedReadStream stream, ref Image? image, ref ImageFrame? previousFrame) + /// The previous disposal method. + /// The background color. + private bool ReadFrame( + BufferedReadStream stream, + ref Image? image, + ref ImageFrame? previousFrame, + ref GifDisposalMethod? previousDisposalMethod, + ref Color backgroundColor) where TPixel : unmanaged, IPixel { this.ReadImageDescriptor(stream); @@ -444,10 +467,52 @@ private void ReadFrame(BufferedReadStream stream, ref Image? ima } ReadOnlySpan colorTable = MemoryMarshal.Cast(rawColorTable); - this.ReadFrameColors(stream, ref image, ref previousFrame, colorTable, this.imageDescriptor); + + // First frame + if (image is null) + { + if (this.backgroundColorIndex < colorTable.Length) + { + backgroundColor = colorTable[this.backgroundColorIndex]; + } + else + { + backgroundColor = Color.Transparent; + } + + if (this.graphicsControlExtension.TransparencyFlag) + { + backgroundColor = backgroundColor.WithAlpha(0); + } + } + + this.ReadFrameColors(stream, ref image, ref previousFrame, ref previousDisposalMethod, colorTable, this.imageDescriptor, backgroundColor.ToPixel()); + + // Update from newly decoded frame. + if (this.graphicsControlExtension.DisposalMethod != GifDisposalMethod.RestoreToPrevious) + { + if (this.backgroundColorIndex < colorTable.Length) + { + backgroundColor = colorTable[this.backgroundColorIndex]; + } + else + { + backgroundColor = Color.Transparent; + } + + // TODO: I don't understand why this is always set to alpha of zero. + // This should be dependent on the transparency flag of the graphics + // control extension. ImageMagick does the same. + // if (this.graphicsControlExtension.TransparencyFlag) + { + backgroundColor = backgroundColor.WithAlpha(0); + } + } // Skip any remaining blocks SkipBlock(stream); + + return !hasLocalColorTable; } /// @@ -457,57 +522,74 @@ private void ReadFrame(BufferedReadStream stream, ref Image? ima /// The containing image data. /// The image to decode the information to. /// The previous frame. + /// The previous disposal method. /// The color table containing the available colors. /// The + /// The background color pixel. private void ReadFrameColors( BufferedReadStream stream, ref Image? image, ref ImageFrame? previousFrame, + ref GifDisposalMethod? previousDisposalMethod, ReadOnlySpan colorTable, - in GifImageDescriptor descriptor) + in GifImageDescriptor descriptor, + TPixel backgroundPixel) where TPixel : unmanaged, IPixel { int imageWidth = this.logicalScreenDescriptor.Width; int imageHeight = this.logicalScreenDescriptor.Height; bool transFlag = this.graphicsControlExtension.TransparencyFlag; + GifDisposalMethod disposalMethod = this.graphicsControlExtension.DisposalMethod; + ImageFrame currentFrame; + ImageFrame? restoreFrame = null; - ImageFrame? prevFrame = null; - ImageFrame? currentFrame = null; - ImageFrame imageFrame; + if (previousFrame is null && previousDisposalMethod is null) + { + image = transFlag + ? new Image(this.configuration, imageWidth, imageHeight, this.metadata) + : new Image(this.configuration, imageWidth, imageHeight, backgroundPixel, this.metadata); - if (previousFrame is null) + this.SetFrameMetadata(image.Frames.RootFrame.Metadata); + currentFrame = image.Frames.RootFrame; + } + else { - if (!transFlag) + if (previousFrame != null) { - image = new Image(this.configuration, imageWidth, imageHeight, Color.Black.ToPixel(), this.metadata); + currentFrame = image!.Frames.AddFrame(previousFrame); } else { - // This initializes the image to become fully transparent because the alpha channel is zero. - image = new Image(this.configuration, imageWidth, imageHeight, this.metadata); + currentFrame = image!.Frames.CreateFrame(backgroundPixel); } - this.SetFrameMetadata(image.Frames.RootFrame.Metadata); + this.SetFrameMetadata(currentFrame.Metadata); - imageFrame = image.Frames.RootFrame; - } - else - { if (this.graphicsControlExtension.DisposalMethod == GifDisposalMethod.RestoreToPrevious) { - prevFrame = previousFrame; + restoreFrame = previousFrame; } - // We create a clone of the frame and add it. - // We will overpaint the difference of pixels on the current frame to create a complete image. - // This ensures that we have enough pixel data to process without distortion. #2450 - currentFrame = image!.Frames.AddFrame(previousFrame); + if (previousDisposalMethod == GifDisposalMethod.RestoreToBackground) + { + this.RestoreToBackground(currentFrame, backgroundPixel, transFlag); + } + } - this.SetFrameMetadata(currentFrame.Metadata); + if (this.graphicsControlExtension.DisposalMethod == GifDisposalMethod.RestoreToPrevious) + { + previousFrame = restoreFrame; + } + else + { + previousFrame = currentFrame; + } - imageFrame = currentFrame; + previousDisposalMethod = disposalMethod; - this.RestoreToBackground(imageFrame); + if (disposalMethod == GifDisposalMethod.RestoreToBackground) + { + this.restoreArea = Rectangle.Intersect(image.Bounds, new(descriptor.Left, descriptor.Top, descriptor.Width, descriptor.Height)); } if (colorTable.Length == 0) @@ -573,7 +655,7 @@ private void ReadFrameColors( } lzwDecoder.DecodePixelRow(indicesRow); - ref TPixel rowRef = ref MemoryMarshal.GetReference(imageFrame.PixelBuffer.DangerousGetRowSpan(writeY)); + ref TPixel rowRef = ref MemoryMarshal.GetReference(currentFrame.PixelBuffer.DangerousGetRowSpan(writeY)); if (!transFlag) { @@ -605,19 +687,6 @@ private void ReadFrameColors( } } } - - if (prevFrame != null) - { - previousFrame = prevFrame; - return; - } - - previousFrame = currentFrame ?? image.Frames.RootFrame; - - if (this.graphicsControlExtension.DisposalMethod == GifDisposalMethod.RestoreToBackground) - { - this.restoreArea = new Rectangle(descriptor.Left, descriptor.Top, descriptor.Width, descriptor.Height); - } } /// @@ -638,6 +707,11 @@ private void ReadFrameMetadata(BufferedReadStream stream, List(768, AllocationOptions.Clean); stream.Read(this.currentLocalColorTable.GetSpan()[..length]); } + else + { + this.currentLocalColorTable = null; + this.currentLocalColorTableSize = 0; + } // Skip the frame indices. Pixels length + mincode size. // The gif format does not tell us the length of the compressed data beforehand. @@ -662,7 +736,9 @@ private void ReadFrameMetadata(BufferedReadStream stream, List /// The pixel format. /// The frame. - private void RestoreToBackground(ImageFrame frame) + /// The background color. + /// Whether the background is transparent. + private void RestoreToBackground(ImageFrame frame, TPixel background, bool transparent) where TPixel : unmanaged, IPixel { if (this.restoreArea is null) @@ -672,7 +748,14 @@ private void RestoreToBackground(ImageFrame frame) Rectangle interest = Rectangle.Intersect(frame.Bounds(), this.restoreArea.Value); Buffer2DRegion pixelRegion = frame.PixelBuffer.GetRegion(interest); - pixelRegion.Clear(); + if (transparent) + { + pixelRegion.Clear(); + } + else + { + pixelRegion.Fill(background); + } this.restoreArea = null; } @@ -787,7 +870,9 @@ private void ReadLogicalScreenDescriptorAndGlobalColorTable(BufferedReadStream s } } - this.gifMetadata.BackgroundColorIndex = this.logicalScreenDescriptor.BackgroundColorIndex; + byte index = this.logicalScreenDescriptor.BackgroundColorIndex; + this.backgroundColorIndex = index; + this.gifMetadata.BackgroundColorIndex = index; } private unsafe struct ScratchBuffer diff --git a/src/ImageSharp/Formats/Gif/GifEncoderCore.cs b/src/ImageSharp/Formats/Gif/GifEncoderCore.cs index 1daa713cbc..f51c97db9a 100644 --- a/src/ImageSharp/Formats/Gif/GifEncoderCore.cs +++ b/src/ImageSharp/Formats/Gif/GifEncoderCore.cs @@ -88,18 +88,22 @@ public void Encode(Image image, Stream stream, CancellationToken GifMetadata gifMetadata = GetGifMetadata(image); this.colorTableMode ??= gifMetadata.ColorTableMode; bool useGlobalTable = this.colorTableMode == GifColorTableMode.Global; - - // Quantize the first image frame returning a palette. - IndexedImageFrame? quantized = null; + bool useGlobalTableForFirstFrame = useGlobalTable; // Work out if there is an explicit transparent index set for the frame. We use that to ensure the // correct value is set for the background index when quantizing. GifFrameMetadata frameMetadata = GetGifFrameMetadata(image.Frames.RootFrame, -1); + if (frameMetadata.ColorTableMode == GifColorTableMode.Local) + { + useGlobalTableForFirstFrame = false; + } + // Quantize the first image frame returning a palette. + IndexedImageFrame? quantized = null; if (this.quantizer is null) { // Is this a gif with color information. If so use that, otherwise use octree. - if (gifMetadata.ColorTableMode == GifColorTableMode.Global && gifMetadata.GlobalColorTable?.Length > 0) + if (useGlobalTable && gifMetadata.GlobalColorTable?.Length > 0) { // We avoid dithering by default to preserve the original colors. int transparencyIndex = GetTransparentIndex(quantized, frameMetadata); @@ -118,8 +122,9 @@ public void Encode(Image image, Stream stream, CancellationToken } } - using (IQuantizer frameQuantizer = this.quantizer.CreatePixelSpecificQuantizer(this.configuration)) + if (useGlobalTableForFirstFrame) { + using IQuantizer frameQuantizer = this.quantizer.CreatePixelSpecificQuantizer(this.configuration); if (useGlobalTable) { frameQuantizer.BuildPalette(this.pixelSamplingStrategy, image); @@ -131,6 +136,17 @@ public void Encode(Image image, Stream stream, CancellationToken quantized = frameQuantizer.QuantizeFrame(image.Frames.RootFrame, image.Bounds); } } + else + { + quantized = this.QuantizeAdditionalFrameAndUpdateMetadata( + image.Frames.RootFrame, + image.Frames.RootFrame.Bounds(), + frameMetadata, + true, + default, + false, + frameMetadata.HasTransparency ? frameMetadata.TransparencyIndex : -1); + } // Write the header. WriteHeader(stream); @@ -243,8 +259,8 @@ private void EncodeAdditionalFrames( return; } - PaletteQuantizer paletteQuantizer = default; - bool hasPaletteQuantizer = false; + PaletteQuantizer globalPaletteQuantizer = default; + bool hasGlobalPaletteQuantizer = false; // Store the first frame as a reference for de-duplication comparison. ImageFrame previousFrame = image.Frames.RootFrame; @@ -260,14 +276,14 @@ private void EncodeAdditionalFrames( GifFrameMetadata gifMetadata = GetGifFrameMetadata(currentFrame, globalTransparencyIndex); bool useLocal = this.colorTableMode == GifColorTableMode.Local || (gifMetadata.ColorTableMode == GifColorTableMode.Local); - if (!useLocal && !hasPaletteQuantizer && i > 0) + if (!useLocal && !hasGlobalPaletteQuantizer && i > 0) { // The palette quantizer can reuse the same global pixel map across multiple frames since the palette is unchanging. // This allows a reduction of memory usage across multi-frame gifs using a global palette // and also allows use to reuse the cache from previous runs. int transparencyIndex = gifMetadata.HasTransparency ? gifMetadata.TransparencyIndex : -1; - paletteQuantizer = new(this.configuration, this.quantizer!.Options, globalPalette, transparencyIndex); - hasPaletteQuantizer = true; + globalPaletteQuantizer = new(this.configuration, this.quantizer!.Options, globalPalette, transparencyIndex); + hasGlobalPaletteQuantizer = true; } this.EncodeAdditionalFrame( @@ -278,16 +294,16 @@ private void EncodeAdditionalFrames( encodingFrame, useLocal, gifMetadata, - paletteQuantizer, + globalPaletteQuantizer, previousDisposalMethod); previousFrame = currentFrame; previousDisposalMethod = gifMetadata.DisposalMethod; } - if (hasPaletteQuantizer) + if (hasGlobalPaletteQuantizer) { - paletteQuantizer.Dispose(); + globalPaletteQuantizer.Dispose(); } } diff --git a/src/ImageSharp/Formats/Gif/GifFrameMetadata.cs b/src/ImageSharp/Formats/Gif/GifFrameMetadata.cs index f8734bb5a3..2d994c14f1 100644 --- a/src/ImageSharp/Formats/Gif/GifFrameMetadata.cs +++ b/src/ImageSharp/Formats/Gif/GifFrameMetadata.cs @@ -1,7 +1,6 @@ // Copyright (c) Six Labors. // Licensed under the Six Labors Split License. -using System.Numerics; using SixLabors.ImageSharp.PixelFormats; namespace SixLabors.ImageSharp.Formats.Gif; @@ -79,35 +78,15 @@ private GifFrameMetadata(GifFrameMetadata other) public IDeepCloneable DeepClone() => new GifFrameMetadata(this); internal static GifFrameMetadata FromAnimatedMetadata(AnimatedImageFrameMetadata metadata) - { - // TODO: v4 How do I link the parent metadata to the frame metadata to get the global color table? - int index = -1; - float background = 1f; - if (metadata.ColorTable.HasValue) - { - ReadOnlySpan colorTable = metadata.ColorTable.Value.Span; - for (int i = 0; i < colorTable.Length; i++) - { - Vector4 vector = (Vector4)colorTable[i]; - if (vector.W < background) - { - index = i; - } - } - } - - bool hasTransparency = index >= 0; - - return new() + => new() { - LocalColorTable = metadata.ColorTable, + // Do not copy the color table or transparency data. + // This will lead to a mismatch when the image is comprised of frames + // extracted individually from a multi-frame image. ColorTableMode = metadata.ColorTableMode == FrameColorTableMode.Global ? GifColorTableMode.Global : GifColorTableMode.Local, FrameDelay = (int)Math.Round(metadata.Duration.TotalMilliseconds / 10), - DisposalMethod = GetMode(metadata.DisposalMode), - HasTransparency = hasTransparency, - TransparencyIndex = hasTransparency ? unchecked((byte)index) : byte.MinValue, + DisposalMethod = GetMode(metadata.DisposalMode) }; - } private static GifDisposalMethod GetMode(FrameDisposalMode mode) => mode switch { diff --git a/src/ImageSharp/Formats/Gif/GifMetadata.cs b/src/ImageSharp/Formats/Gif/GifMetadata.cs index 1331edee89..088d4d088d 100644 --- a/src/ImageSharp/Formats/Gif/GifMetadata.cs +++ b/src/ImageSharp/Formats/Gif/GifMetadata.cs @@ -73,28 +73,12 @@ private GifMetadata(GifMetadata other) public IDeepCloneable DeepClone() => new GifMetadata(this); internal static GifMetadata FromAnimatedMetadata(AnimatedImageMetadata metadata) - { - int index = 0; - Color background = metadata.BackgroundColor; - if (metadata.ColorTable.HasValue) + => new() { - ReadOnlySpan colorTable = metadata.ColorTable.Value.Span; - for (int i = 0; i < colorTable.Length; i++) - { - if (background == colorTable[i]) - { - index = i; - break; - } - } - } - - return new() - { - GlobalColorTable = metadata.ColorTable, + // Do not copy the color table or bit depth. + // This will lead to a mismatch when the image is comprised of frames + // extracted individually from a multi-frame image. ColorTableMode = metadata.ColorTableMode == FrameColorTableMode.Global ? GifColorTableMode.Global : GifColorTableMode.Local, RepeatCount = metadata.RepeatCount, - BackgroundColorIndex = (byte)Numerics.Clamp(index, 0, 255), }; - } } diff --git a/src/ImageSharp/Formats/Gif/MetadataExtensions.cs b/src/ImageSharp/Formats/Gif/MetadataExtensions.cs index ad06462e77..4e9977b3fd 100644 --- a/src/ImageSharp/Formats/Gif/MetadataExtensions.cs +++ b/src/ImageSharp/Formats/Gif/MetadataExtensions.cs @@ -61,18 +61,17 @@ public static bool TryGetGifMetadata(this ImageFrameMetadata source, [NotNullWhe internal static AnimatedImageMetadata ToAnimatedImageMetadata(this GifMetadata source) { - Color background = Color.Transparent; - if (source.GlobalColorTable != null) - { - background = source.GlobalColorTable.Value.Span[source.BackgroundColorIndex]; - } + bool global = source.ColorTableMode == GifColorTableMode.Global; + Color color = global && source.GlobalColorTable.HasValue && source.GlobalColorTable.Value.Span.Length > source.BackgroundColorIndex + ? source.GlobalColorTable.Value.Span[source.BackgroundColorIndex] + : Color.Transparent; return new() { - ColorTable = source.GlobalColorTable, ColorTableMode = source.ColorTableMode == GifColorTableMode.Global ? FrameColorTableMode.Global : FrameColorTableMode.Local, + ColorTable = global ? source.GlobalColorTable : null, RepeatCount = source.RepeatCount, - BackgroundColor = background, + BackgroundColor = color, }; } diff --git a/src/ImageSharp/Formats/Png/PngDecoderCore.cs b/src/ImageSharp/Formats/Png/PngDecoderCore.cs index 44e76407c5..cef8396d4b 100644 --- a/src/ImageSharp/Formats/Png/PngDecoderCore.cs +++ b/src/ImageSharp/Formats/Png/PngDecoderCore.cs @@ -1853,6 +1853,9 @@ private bool TryReadChunk(Span buffer, out PngChunk chunk) return false; } + // Capture the current position so we can revert back to it if we fail to read a valid chunk. + long position = this.currentStream.Position; + if (!this.TryReadChunkLength(buffer, out int length)) { // IEND @@ -1871,7 +1874,48 @@ private bool TryReadChunk(Span buffer, out PngChunk chunk) } } - PngChunkType type = this.ReadChunkType(buffer); + PngChunkType type; + + // Loop until we get a chunk type that is valid. + while (true) + { + type = this.ReadChunkType(buffer); + if (!IsValidChunkType(type)) + { + // The chunk type is invalid. + // Revert back to the next byte past the previous position and try again. + this.currentStream.Position = ++position; + + // If we are now at the end of the stream, we're done. + if (this.currentStream.Position >= this.currentStream.Length) + { + chunk = default; + return false; + } + + // Read the next chunk’s length. + if (!this.TryReadChunkLength(buffer, out length)) + { + chunk = default; + return false; + } + + while (length < 0) + { + if (!this.TryReadChunkLength(buffer, out length)) + { + chunk = default; + return false; + } + } + + // Continue to try reading the next chunk. + continue; + } + + // We have a valid chunk type. + break; + } // If we're reading color metadata only we're only interested in the IHDR and tRNS chunks. // We can skip most other chunk data in the stream for better performance. @@ -1888,7 +1932,7 @@ private bool TryReadChunk(Span buffer, out PngChunk chunk) // A chunk might report a length that exceeds the length of the stream. // Take the minimum of the two values to ensure we don't read past the end of the stream. - long position = this.currentStream.Position; + position = this.currentStream.Position; chunk = new PngChunk( length: (int)Math.Min(length, this.currentStream.Length - position), type: type, @@ -1906,6 +1950,32 @@ private bool TryReadChunk(Span buffer, out PngChunk chunk) return true; } + /// + /// Determines whether the 4-byte chunk type is valid (all ASCII letters). + /// + /// The chunk type. + [MethodImpl(InliningOptions.ShortMethod)] + private static bool IsValidChunkType(PngChunkType type) + { + uint value = (uint)type; + byte b0 = (byte)(value >> 24); + byte b1 = (byte)(value >> 16); + byte b2 = (byte)(value >> 8); + byte b3 = (byte)value; + return IsAsciiLetter(b0) && IsAsciiLetter(b1) && IsAsciiLetter(b2) && IsAsciiLetter(b3); + } + + /// + /// Returns a value indicating whether the given byte is an ASCII letter. + /// + /// The byte to check. + /// + /// if the byte is an ASCII letter; otherwise, . + /// + [MethodImpl(InliningOptions.ShortMethod)] + private static bool IsAsciiLetter(byte b) + => (b >= (byte)'A' && b <= (byte)'Z') || (b >= (byte)'a' && b <= (byte)'z'); + /// /// Validates the png chunk. /// diff --git a/src/ImageSharp/Formats/Png/PngEncoder.cs b/src/ImageSharp/Formats/Png/PngEncoder.cs index dcbaf3140d..50a6b44f83 100644 --- a/src/ImageSharp/Formats/Png/PngEncoder.cs +++ b/src/ImageSharp/Formats/Png/PngEncoder.cs @@ -2,8 +2,6 @@ // Licensed under the Six Labors Split License. #nullable disable -using SixLabors.ImageSharp.Processing.Processors.Quantization; - namespace SixLabors.ImageSharp.Formats.Png; /// @@ -11,16 +9,6 @@ namespace SixLabors.ImageSharp.Formats.Png; /// public class PngEncoder : QuantizingImageEncoder { - /// - /// Initializes a new instance of the class. - /// - public PngEncoder() - - // Hack. TODO: Investigate means to fix/optimize the Wu quantizer. - // The Wu quantizer does not handle the default sampling strategy well for some larger images. - // It's expensive and the results are not better than the extensive strategy. - => this.PixelSamplingStrategy = new ExtensivePixelSamplingStrategy(); - /// /// Gets the number of bits per sample or per palette index (not per pixel). /// Not all values are allowed for all values. diff --git a/src/ImageSharp/Formats/Png/PngEncoderCore.cs b/src/ImageSharp/Formats/Png/PngEncoderCore.cs index e01b5c2a59..6f0b91c9c7 100644 --- a/src/ImageSharp/Formats/Png/PngEncoderCore.cs +++ b/src/ImageSharp/Formats/Png/PngEncoderCore.cs @@ -3,6 +3,7 @@ using System.Buffers; using System.Buffers.Binary; +using System.Diagnostics.CodeAnalysis; using System.Numerics; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; @@ -124,6 +125,14 @@ internal sealed class PngEncoderCore : IDisposable /// private int derivedTransparencyIndex = -1; + /// + /// The default background color of the canvas when animating. + /// This color may be used to fill the unused space on the canvas around the frames, + /// as well as the transparent pixels of the first frame. + /// The background color is also used when a frame disposal mode is . + /// + private Color? backgroundColor; + /// /// Initializes a new instance of the class. /// @@ -161,118 +170,174 @@ public void Encode(Image image, Stream stream, CancellationToken ImageFrame? clonedFrame = null; ImageFrame currentFrame = image.Frames.RootFrame; - int currentFrameIndex = 0; + IndexedImageFrame? quantized = null; + PaletteQuantizer? paletteQuantizer = null; + Buffer2DRegion currentFrameRegion = currentFrame.PixelBuffer.GetRegion(); - bool clearTransparency = this.encoder.TransparentColorMode is PngTransparentColorMode.Clear; - if (clearTransparency) + try { - currentFrame = clonedFrame = currentFrame.Clone(); - ClearTransparentPixels(currentFrame); - } - - // Do not move this. We require an accurate bit depth for the header chunk. - IndexedImageFrame? quantized = this.CreateQuantizedImageAndUpdateBitDepth( - pngMetadata, - currentFrame, - currentFrame.Bounds(), - null); - - this.WriteHeaderChunk(stream); - this.WriteGammaChunk(stream); - this.WriteCicpChunk(stream, metadata); - this.WriteColorProfileChunk(stream, metadata); - this.WritePaletteChunk(stream, quantized); - this.WriteTransparencyChunk(stream, pngMetadata); - this.WritePhysicalChunk(stream, metadata); - this.WriteExifChunk(stream, metadata); - this.WriteXmpChunk(stream, metadata); - this.WriteTextChunks(stream, pngMetadata); - - if (image.Frames.Count > 1) - { - this.WriteAnimationControlChunk(stream, (uint)(image.Frames.Count - (pngMetadata.AnimateRootFrame ? 0 : 1)), pngMetadata.RepeatCount); - } + int currentFrameIndex = 0; - // If the first frame isn't animated, write it as usual and skip it when writing animated frames - if (!pngMetadata.AnimateRootFrame || image.Frames.Count == 1) - { - FrameControl frameControl = new((uint)this.width, (uint)this.height); - this.WriteDataChunks(frameControl, currentFrame.PixelBuffer.GetRegion(), quantized, stream, false); - currentFrameIndex++; - } + bool clearTransparency = this.encoder.TransparentColorMode is PngTransparentColorMode.Clear; + if (clearTransparency) + { + currentFrame = clonedFrame = currentFrame.Clone(); + currentFrameRegion = currentFrame.PixelBuffer.GetRegion(); + ClearTransparentPixels(in currentFrameRegion, this.backgroundColor.Value); + } - if (image.Frames.Count > 1) - { - // Write the first animated frame. - currentFrame = image.Frames[currentFrameIndex]; - PngFrameMetadata frameMetadata = GetPngFrameMetadata(currentFrame); - PngDisposalMethod previousDisposal = frameMetadata.DisposalMethod; - FrameControl frameControl = this.WriteFrameControlChunk(stream, frameMetadata, currentFrame.Bounds(), 0); - uint sequenceNumber = 1; - if (pngMetadata.AnimateRootFrame) + // Do not move this. We require an accurate bit depth for the header chunk. + quantized = this.CreateQuantizedImageAndUpdateBitDepth( + pngMetadata, + image, + currentFrame, + currentFrame.Bounds(), + null); + + this.WriteHeaderChunk(stream); + this.WriteGammaChunk(stream); + this.WriteCicpChunk(stream, metadata); + this.WriteColorProfileChunk(stream, metadata); + this.WritePaletteChunk(stream, quantized); + this.WriteTransparencyChunk(stream, pngMetadata); + this.WritePhysicalChunk(stream, metadata); + this.WriteExifChunk(stream, metadata); + this.WriteXmpChunk(stream, metadata); + this.WriteTextChunks(stream, pngMetadata); + + if (image.Frames.Count > 1) { - this.WriteDataChunks(frameControl, currentFrame.PixelBuffer.GetRegion(), quantized, stream, false); + this.WriteAnimationControlChunk( + stream, + (uint)(image.Frames.Count - (pngMetadata.AnimateRootFrame ? 0 : 1)), + pngMetadata.RepeatCount); } - else + + // If the first frame isn't animated, write it as usual and skip it when writing animated frames + if (!pngMetadata.AnimateRootFrame || image.Frames.Count == 1) { - sequenceNumber += this.WriteDataChunks(frameControl, currentFrame.PixelBuffer.GetRegion(), quantized, stream, true); + cancellationToken.ThrowIfCancellationRequested(); + FrameControl frameControl = new((uint)this.width, (uint)this.height); + this.WriteDataChunks(in frameControl, in currentFrameRegion, quantized, stream, false); + currentFrameIndex++; } - currentFrameIndex++; + if (image.Frames.Count > 1) + { + // Write the first animated frame. + currentFrame = image.Frames[currentFrameIndex]; + currentFrameRegion = currentFrame.PixelBuffer.GetRegion(); - // Capture the global palette for reuse on subsequent frames. - ReadOnlyMemory? previousPalette = quantized?.Palette.ToArray(); + PngFrameMetadata frameMetadata = GetPngFrameMetadata(currentFrame); + PngDisposalMethod previousDisposal = frameMetadata.DisposalMethod; + FrameControl frameControl = this.WriteFrameControlChunk(stream, frameMetadata, currentFrame.Bounds(), 0); + uint sequenceNumber = 1; + if (pngMetadata.AnimateRootFrame) + { + this.WriteDataChunks(in frameControl, in currentFrameRegion, quantized, stream, false); + } + else + { + sequenceNumber += this.WriteDataChunks(in frameControl, in currentFrameRegion, quantized, stream, true); + } - // Write following frames. - ImageFrame previousFrame = image.Frames.RootFrame; + currentFrameIndex++; - // This frame is reused to store de-duplicated pixel buffers. - using ImageFrame encodingFrame = new(image.Configuration, previousFrame.Size()); + // Capture the global palette for reuse on subsequent frames. + ReadOnlyMemory previousPalette = quantized?.Palette.ToArray(); - for (; currentFrameIndex < image.Frames.Count; currentFrameIndex++) - { - ImageFrame? prev = previousDisposal == PngDisposalMethod.RestoreToBackground ? null : previousFrame; - currentFrame = image.Frames[currentFrameIndex]; - ImageFrame? nextFrame = currentFrameIndex < image.Frames.Count - 1 ? image.Frames[currentFrameIndex + 1] : null; + if (!previousPalette.IsEmpty) + { + // Use the previously derived global palette and a shared quantizer to + // quantize the subsequent frames. This allows us to cache the color matching resolution. + paletteQuantizer ??= new( + this.configuration, + this.quantizer!.Options, + previousPalette, + this.derivedTransparencyIndex); + } - frameMetadata = GetPngFrameMetadata(currentFrame); - bool blend = frameMetadata.BlendMethod == PngBlendMethod.Over; + // Write following frames. + ImageFrame previousFrame = image.Frames.RootFrame; - (bool difference, Rectangle bounds) = - AnimationUtilities.DeDuplicatePixels( - image.Configuration, - prev, - currentFrame, - nextFrame, - encodingFrame, - Color.Transparent, - blend); + // This frame is reused to store de-duplicated pixel buffers. + using ImageFrame encodingFrame = new(image.Configuration, previousFrame.Size()); - if (clearTransparency) + for (; currentFrameIndex < image.Frames.Count; currentFrameIndex++) { - ClearTransparentPixels(encodingFrame); - } + cancellationToken.ThrowIfCancellationRequested(); + + ImageFrame? prev = previousDisposal == PngDisposalMethod.RestoreToBackground ? null : previousFrame; + currentFrame = image.Frames[currentFrameIndex]; + ImageFrame? nextFrame = currentFrameIndex < image.Frames.Count - 1 ? image.Frames[currentFrameIndex + 1] : null; + + frameMetadata = GetPngFrameMetadata(currentFrame); + + // Determine whether to blend the current frame over the existing canvas. + // Blending is applied only when the blend method is 'Over' (source-over blending) + // and when the frame's disposal method is not 'RestoreToPrevious', which indicates that + // the frame should not permanently alter the canvas. + bool blend = frameMetadata.BlendMethod == PngBlendMethod.Over + && frameMetadata.DisposalMethod != PngDisposalMethod.RestoreToPrevious; + + // Establish the background color for the current frame. + // If the disposal method is 'RestoreToBackground', use the predefined background color; + // otherwise, use transparent, as no explicit background restoration is needed. + Color background = frameMetadata.DisposalMethod == PngDisposalMethod.RestoreToBackground + ? this.backgroundColor.Value + : Color.Transparent; + + (bool difference, Rectangle bounds) = + AnimationUtilities.DeDuplicatePixels( + image.Configuration, + prev, + currentFrame, + nextFrame, + encodingFrame, + background, + blend); + + Buffer2DRegion encodingFrameRegion = encodingFrame.PixelBuffer.GetRegion(bounds); + if (clearTransparency) + { + ClearTransparentPixels(in encodingFrameRegion, background); + } - // Each frame control sequence number must be incremented by the number of frame data chunks that follow. - frameControl = this.WriteFrameControlChunk(stream, frameMetadata, bounds, sequenceNumber); + // Each frame control sequence number must be incremented by the number of frame data chunks that follow. + frameControl = this.WriteFrameControlChunk(stream, frameMetadata, bounds, sequenceNumber); - // Dispose of previous quantized frame and reassign. - quantized?.Dispose(); - quantized = this.CreateQuantizedImageAndUpdateBitDepth(pngMetadata, encodingFrame, bounds, previousPalette); - sequenceNumber += this.WriteDataChunks(frameControl, encodingFrame.PixelBuffer.GetRegion(bounds), quantized, stream, true) + 1; + // Dispose of previous quantized frame and reassign. + quantized?.Dispose(); - previousFrame = currentFrame; - previousDisposal = frameMetadata.DisposalMethod; - } - } + quantized = this.CreateQuantizedFrame( + this.encoder, + this.colorType, + this.bitDepth, + pngMetadata, + image, + encodingFrame, + bounds, + paletteQuantizer, + default); - this.WriteEndChunk(stream); + sequenceNumber += this.WriteDataChunks(frameControl, in encodingFrameRegion, quantized, stream, true) + 1; - stream.Flush(); + previousFrame = currentFrame; + previousDisposal = frameMetadata.DisposalMethod; + } + } - // Dispose of allocations from final frame. - clonedFrame?.Dispose(); - quantized?.Dispose(); + this.WriteEndChunk(stream); + + stream.Flush(); + } + finally + { + // Dispose of allocations from final frame. + clonedFrame?.Dispose(); + quantized?.Dispose(); + paletteQuantizer?.Dispose(); + } } /// @@ -293,7 +358,9 @@ private static PngMetadata GetPngMetadata(Image image) if (image.Metadata.TryGetGifMetadata(out GifMetadata? gif)) { AnimatedImageMetadata ani = gif.ToAnimatedImageMetadata(); - return PngMetadata.FromAnimatedMetadata(ani); + PngMetadata metadata = PngMetadata.FromAnimatedMetadata(ani); + metadata.ColorType = PngColorType.Palette; + return metadata; } if (image.Metadata.TryGetWebpMetadata(out WebpMetadata? webp)) @@ -335,45 +402,62 @@ private static PngFrameMetadata GetPngFrameMetadata(ImageFrame f /// /// The type of the pixel. /// The cloned image frame where the transparent pixels will be changed. - private static void ClearTransparentPixels(ImageFrame clone) + /// The color to change transparent pixels to. + private static void ClearTransparentPixels(in Buffer2DRegion clone, Color color) where TPixel : unmanaged, IPixel - => clone.ProcessPixelRows(accessor => + { + Rgba32 rgba32 = default; + Rgba32 transparent = color; + for (int y = 0; y < clone.Height; y++) { - // TODO: We should be able to speed this up with SIMD and masking. - Rgba32 rgba32 = default; - Rgba32 transparent = Color.Transparent; - for (int y = 0; y < accessor.Height; y++) + Span row = clone.DangerousGetRowSpan(y); + for (int x = 0; x < row.Length; x++) { - Span span = accessor.GetRowSpan(y); - for (int x = 0; x < accessor.Width; x++) - { - span[x].ToRgba32(ref rgba32); + ref TPixel pixel = ref row[x]; + pixel.ToRgba32(ref rgba32); - if (rgba32.A is 0) - { - span[x].FromRgba32(transparent); - } + if (rgba32.A is 0) + { + pixel.FromRgba32(transparent); } } - }); + } + } /// /// Creates the quantized image and calculates and sets the bit depth. /// /// The type of the pixel. /// The image metadata. - /// The frame to quantize. + /// The image. + /// The current image frame. /// The area of interest within the frame. - /// Any previously derived palette. + /// The quantizer containing any previously derived palette. /// The quantized image. private IndexedImageFrame? CreateQuantizedImageAndUpdateBitDepth( PngMetadata metadata, + Image image, ImageFrame frame, Rectangle bounds, - ReadOnlyMemory? previousPalette) + PaletteQuantizer? paletteQuantizer) where TPixel : unmanaged, IPixel { - IndexedImageFrame? quantized = this.CreateQuantizedFrame(this.encoder, this.colorType, this.bitDepth, metadata, frame, bounds, previousPalette); + PngFrameMetadata frameMetadata = GetPngFrameMetadata(frame); + Color background = frameMetadata.DisposalMethod == PngDisposalMethod.RestoreToBackground + ? this.backgroundColor ?? Color.Transparent + : Color.Transparent; + + IndexedImageFrame? quantized = this.CreateQuantizedFrame( + this.encoder, + this.colorType, + this.bitDepth, + metadata, + image, + frame, + bounds, + paletteQuantizer, + background); + this.bitDepth = CalculateBitDepth(this.colorType, this.bitDepth, quantized); return quantized; } @@ -876,6 +960,7 @@ private void WriteXmpChunk(Stream stream, ImageMetadata meta) /// /// The containing image data. /// The image meta data. + /// CICP matrix coefficients other than Identity are not supported in PNG. private void WriteCicpChunk(Stream stream, ImageMetadata metaData) { if (metaData.CicpProfile is null) @@ -1139,7 +1224,7 @@ private FrameControl WriteFrameControlChunk(Stream stream, PngFrameMetadata fram /// The quantized pixel data. Can be null. /// The stream. /// Is writing fdAT or IDAT. - private uint WriteDataChunks(FrameControl frameControl, Buffer2DRegion frame, IndexedImageFrame? quantized, Stream stream, bool isFrame) + private uint WriteDataChunks(in FrameControl frameControl, in Buffer2DRegion frame, IndexedImageFrame? quantized, Stream stream, bool isFrame) where TPixel : unmanaged, IPixel { byte[] buffer; @@ -1157,12 +1242,12 @@ private uint WriteDataChunks(FrameControl frameControl, Buffer2DRegionThe image frame pixel buffer. /// The quantized pixels. /// The deflate stream. - private void EncodePixels(Buffer2DRegion pixels, IndexedImageFrame? quantized, ZlibDeflateStream deflateStream) + private void EncodePixels(in Buffer2DRegion pixels, IndexedImageFrame? quantized, ZlibDeflateStream deflateStream) where TPixel : unmanaged, IPixel { int bytesPerScanline = this.CalculateScanlineLength(pixels.Width); @@ -1244,7 +1329,8 @@ private void EncodePixels(Buffer2DRegion pixels, IndexedImageFra Span attempt = attemptBuffer.GetSpan(); for (int y = 0; y < pixels.Height; y++) { - this.CollectAndFilterPixelRow(pixels.DangerousGetRowSpan(y), ref filter, ref attempt, quantized, y); + ReadOnlySpan rowSpan = pixels.DangerousGetRowSpan(y); + this.CollectAndFilterPixelRow(rowSpan, ref filter, ref attempt, quantized, y); deflateStream.Write(filter); this.SwapScanlineBuffers(); } @@ -1256,7 +1342,7 @@ private void EncodePixels(Buffer2DRegion pixels, IndexedImageFra /// The type of the pixel. /// The image frame pixel buffer. /// The deflate stream. - private void EncodeAdam7Pixels(Buffer2DRegion pixels, ZlibDeflateStream deflateStream) + private void EncodeAdam7Pixels(in Buffer2DRegion pixels, ZlibDeflateStream deflateStream) where TPixel : unmanaged, IPixel { for (int pass = 0; pass < 7; pass++) @@ -1292,7 +1378,7 @@ private void EncodeAdam7Pixels(Buffer2DRegion pixels, ZlibDeflat // Encode data // Note: quantized parameter not used // Note: row parameter not used - this.CollectAndFilterPixelRow(block, ref filter, ref attempt, null, -1); + this.CollectAndFilterPixelRow((ReadOnlySpan)block, ref filter, ref attempt, null, -1); deflateStream.Write(filter); this.SwapScanlineBuffers(); @@ -1464,6 +1550,7 @@ private void SwapScanlineBuffers() /// The PNG metadata. /// if set to true [use16 bit]. /// The bytes per pixel. + [MemberNotNull(nameof(backgroundColor))] private void SanitizeAndSetEncoderOptions( PngEncoder encoder, PngMetadata pngMetadata, @@ -1502,6 +1589,7 @@ private void SanitizeAndSetEncoderOptions( this.interlaceMode = (encoder.InterlaceMethod ?? pngMetadata.InterlaceMethod)!.Value; this.chunkFilter = encoder.SkipMetadata ? PngChunkFilter.ExcludeAll : encoder.ChunkFilter ?? PngChunkFilter.None; + this.backgroundColor = pngMetadata.TransparentColor ?? Color.Transparent; } /// @@ -1512,17 +1600,21 @@ private void SanitizeAndSetEncoderOptions( /// The color type. /// The bits per component. /// The image metadata. - /// The frame to quantize. + /// The image. + /// The current image frame. /// The frame area of interest. - /// Any previously derived palette. + /// The quantizer containing any previously derived palette. + /// The background color. private IndexedImageFrame? CreateQuantizedFrame( - QuantizingImageEncoder encoder, + PngEncoder encoder, PngColorType colorType, byte bitDepth, PngMetadata metadata, + Image image, ImageFrame frame, Rectangle bounds, - ReadOnlyMemory? previousPalette) + PaletteQuantizer? paletteQuantizer, + Color backgroundColor) where TPixel : unmanaged, IPixel { if (colorType is not PngColorType.Palette) @@ -1530,22 +1622,15 @@ private void SanitizeAndSetEncoderOptions( return null; } - if (previousPalette is not null) + if (paletteQuantizer.HasValue) { - // Use the previously derived palette created by quantizing the root frame to quantize the current frame. - using PaletteQuantizer paletteQuantizer = new( - this.configuration, - this.quantizer!.Options, - previousPalette.Value, - this.derivedTransparencyIndex); - paletteQuantizer.BuildPalette(encoder.PixelSamplingStrategy, frame); - return paletteQuantizer.QuantizeFrame(frame, bounds); + return paletteQuantizer.Value.QuantizeFrame(frame, bounds); } // Use the metadata to determine what quantization depth to use if no quantizer has been set. if (this.quantizer is null) { - if (metadata.ColorTable is not null) + if (metadata.ColorTable.HasValue && !metadata.ColorTable.Value.IsEmpty) { // We can use the color data from the decoded metadata here. // We avoid dithering by default to preserve the original colors. @@ -1578,7 +1663,37 @@ private void SanitizeAndSetEncoderOptions( // Create quantized frame returning the palette and set the bit depth. using IQuantizer frameQuantizer = this.quantizer.CreatePixelSpecificQuantizer(frame.Configuration); - frameQuantizer.BuildPalette(encoder.PixelSamplingStrategy, frame); + if (image.Frames.Count > 1) + { + // Encoding animated frames with a global palette requires a transparent pixel in the palette + // since we only encode the delta between frames. To ensure that we have a transparent pixel + // we create a fake frame with a containing only transparent pixels and add it to the palette. + using Buffer2D px = image.Configuration.MemoryAllocator.Allocate2D(Math.Min(256, image.Width), Math.Min(256, image.Height)); + TPixel backGroundPixel = backgroundColor.ToPixel(); + for (int i = 0; i < px.Height; i++) + { + px.DangerousGetRowSpan(i).Fill(backGroundPixel); + } + + frameQuantizer.AddPaletteColors(px.GetRegion()); + } + + if (encoder.TransparentColorMode == PngTransparentColorMode.Clear) + { + foreach (Buffer2DRegion region in encoder.PixelSamplingStrategy.EnumeratePixelRegions(image)) + { + using Buffer2D clone = region.Buffer.CloneRegion(this.configuration, region.Rectangle); + Buffer2DRegion clonedRegion = clone.GetRegion(); + + ClearTransparentPixels(in clonedRegion, backgroundColor); + frameQuantizer.AddPaletteColors(clonedRegion); + } + } + else + { + frameQuantizer.BuildPalette(encoder.PixelSamplingStrategy, image); + } + return frameQuantizer.QuantizeFrame(frame, bounds); } diff --git a/src/ImageSharp/Formats/Png/PngMetadata.cs b/src/ImageSharp/Formats/Png/PngMetadata.cs index d9028dd807..296465b773 100644 --- a/src/ImageSharp/Formats/Png/PngMetadata.cs +++ b/src/ImageSharp/Formats/Png/PngMetadata.cs @@ -93,32 +93,12 @@ private PngMetadata(PngMetadata other) public IDeepCloneable DeepClone() => new PngMetadata(this); internal static PngMetadata FromAnimatedMetadata(AnimatedImageMetadata metadata) - { - // Should the conversion be from a format that uses a 24bit palette entries (gif) - // we need to clone and adjust the color table to allow for transparency. - Color[]? colorTable = metadata.ColorTable.HasValue ? metadata.ColorTable.Value.ToArray() : null; - if (colorTable != null) + => new() { - for (int i = 0; i < colorTable.Length; i++) - { - ref Color c = ref colorTable[i]; - if (c == metadata.BackgroundColor) - { - // Png treats background as fully empty - c = Color.Transparent; - break; - } - } - } - - return new() - { - ColorType = colorTable != null ? PngColorType.Palette : null, - BitDepth = colorTable != null - ? (PngBitDepth)Numerics.Clamp(ColorNumerics.GetBitsNeededForColorDepth(colorTable.Length), 1, 8) - : null, - ColorTable = colorTable, + // Do not copy the color table or bit depth. + // This will lead to a mismatch when the image is comprised of frames + // extracted individually from a multi-frame image. + ColorType = metadata.ColorTable != null ? PngColorType.Palette : null, RepeatCount = metadata.RepeatCount, }; - } } diff --git a/src/ImageSharp/Formats/Qoi/QoiDecoder.cs b/src/ImageSharp/Formats/Qoi/QoiDecoder.cs index a54095dfc6..5c1bf6ad23 100644 --- a/src/ImageSharp/Formats/Qoi/QoiDecoder.cs +++ b/src/ImageSharp/Formats/Qoi/QoiDecoder.cs @@ -4,6 +4,7 @@ using SixLabors.ImageSharp.PixelFormats; namespace SixLabors.ImageSharp.Formats.Qoi; + internal class QoiDecoder : ImageDecoder { private QoiDecoder() diff --git a/src/ImageSharp/Formats/Webp/BitReader/BitReaderBase.cs b/src/ImageSharp/Formats/Webp/BitReader/BitReaderBase.cs index 83f9e797ab..2b843cc8f6 100644 --- a/src/ImageSharp/Formats/Webp/BitReader/BitReaderBase.cs +++ b/src/ImageSharp/Formats/Webp/BitReader/BitReaderBase.cs @@ -32,7 +32,7 @@ protected BitReaderBase(Stream inputStream, int imageDataSize, MemoryAllocator m /// Used for allocating memory during reading data from the stream. protected static IMemoryOwner ReadImageDataFromStream(Stream input, int bytesToRead, MemoryAllocator memoryAllocator) { - IMemoryOwner data = memoryAllocator.Allocate(bytesToRead); + IMemoryOwner data = memoryAllocator.Allocate(bytesToRead, AllocationOptions.Clean); Span dataSpan = data.Memory.Span; input.Read(dataSpan[..bytesToRead], 0, bytesToRead); diff --git a/src/ImageSharp/Formats/Webp/Lossy/Vp8Decoder.cs b/src/ImageSharp/Formats/Webp/Lossy/Vp8Decoder.cs index b3c5bfaf41..8e0c986a14 100644 --- a/src/ImageSharp/Formats/Webp/Lossy/Vp8Decoder.cs +++ b/src/ImageSharp/Formats/Webp/Lossy/Vp8Decoder.cs @@ -74,7 +74,7 @@ public Vp8Decoder(Vp8FrameHeader frameHeader, Vp8PictureHeader pictureHeader, Vp this.TmpYBuffer = memoryAllocator.Allocate((int)width); this.TmpUBuffer = memoryAllocator.Allocate((int)width); this.TmpVBuffer = memoryAllocator.Allocate((int)width); - this.Pixels = memoryAllocator.Allocate((int)(width * height * 4)); + this.Pixels = memoryAllocator.Allocate((int)(width * height * 4), AllocationOptions.Clean); #if DEBUG // Filling those buffers with 205, is only useful for debugging, diff --git a/src/ImageSharp/Formats/Webp/WebpAnimationDecoder.cs b/src/ImageSharp/Formats/Webp/WebpAnimationDecoder.cs index 65f1a4da46..b9f58c3d84 100644 --- a/src/ImageSharp/Formats/Webp/WebpAnimationDecoder.cs +++ b/src/ImageSharp/Formats/Webp/WebpAnimationDecoder.cs @@ -81,16 +81,29 @@ public WebpAnimationDecoder(MemoryAllocator memoryAllocator, Configuration confi /// The width of the image. /// The height of the image. /// The size of the image data in bytes. - public Image Decode(BufferedReadStream stream, WebpFeatures features, uint width, uint height, uint completeDataSize) + public Image Decode( + BufferedReadStream stream, + WebpFeatures features, + uint width, + uint height, + uint completeDataSize) where TPixel : unmanaged, IPixel { Image? image = null; ImageFrame? previousFrame = null; + WebpFrameData? prevFrameData = null; this.metadata = new ImageMetadata(); this.webpMetadata = this.metadata.GetWebpMetadata(); this.webpMetadata.RepeatCount = features.AnimationLoopCount; + Color backgroundColor = this.backgroundColorHandling == BackgroundColorHandling.Ignore + ? Color.Transparent + : features.AnimationBackgroundColor!.Value; + + this.webpMetadata.BackgroundColor = backgroundColor; + TPixel backgroundPixel = backgroundColor.ToPixel(); + Span buffer = stackalloc byte[4]; uint frameCount = 0; int remainingBytes = (int)completeDataSize; @@ -101,10 +114,15 @@ public Image Decode(BufferedReadStream stream, WebpFeatures feat switch (chunkType) { case WebpChunkType.FrameData: - Color backgroundColor = this.backgroundColorHandling == BackgroundColorHandling.Ignore - ? new Color(new Bgra32(0, 0, 0, 0)) - : features.AnimationBackgroundColor!.Value; - uint dataSize = this.ReadFrame(stream, ref image, ref previousFrame, width, height, backgroundColor); + uint dataSize = this.ReadFrame( + stream, + ref image, + ref previousFrame, + ref prevFrameData, + width, + height, + backgroundPixel); + remainingBytes -= (int)dataSize; break; case WebpChunkType.Xmp: @@ -132,10 +150,18 @@ public Image Decode(BufferedReadStream stream, WebpFeatures feat /// The stream, where the image should be decoded from. Cannot be null. /// The image to decode the information to. /// The previous frame. + /// The previous frame data. /// The width of the image. /// The height of the image. /// The default background color of the canvas in. - private uint ReadFrame(BufferedReadStream stream, ref Image? image, ref ImageFrame? previousFrame, uint width, uint height, Color backgroundColor) + private uint ReadFrame( + BufferedReadStream stream, + ref Image? image, + ref ImageFrame? previousFrame, + ref WebpFrameData? prevFrameData, + uint width, + uint height, + TPixel backgroundColor) where TPixel : unmanaged, IPixel { WebpFrameData frameData = WebpFrameData.Parse(stream); @@ -174,40 +200,51 @@ private uint ReadFrame(BufferedReadStream stream, ref Image? ima break; } - ImageFrame? currentFrame = null; - ImageFrame imageFrame; + ImageFrame currentFrame; if (previousFrame is null) { - image = new Image(this.configuration, (int)width, (int)height, backgroundColor.ToPixel(), this.metadata); + image = new Image(this.configuration, (int)width, (int)height, backgroundColor, this.metadata); - SetFrameMetadata(image.Frames.RootFrame.Metadata, frameData); - - imageFrame = image.Frames.RootFrame; + currentFrame = image.Frames.RootFrame; + SetFrameMetadata(currentFrame.Metadata, frameData); } else { - currentFrame = image!.Frames.AddFrame(previousFrame); // This clones the frame and adds it the collection. + // If the frame is a key frame we do not need to clone the frame or clear it. + bool isKeyFrame = prevFrameData?.DisposalMethod is WebpDisposalMethod.RestoreToBackground + && this.restoreArea == image!.Bounds; - SetFrameMetadata(currentFrame.Metadata, frameData); + if (isKeyFrame) + { + currentFrame = image!.Frames.CreateFrame(backgroundColor); + } + else + { + // This clones the frame and adds it the collection. + currentFrame = image!.Frames.AddFrame(previousFrame); + if (prevFrameData?.DisposalMethod is WebpDisposalMethod.RestoreToBackground) + { + this.RestoreToBackground(currentFrame, backgroundColor); + } + } - imageFrame = currentFrame; + SetFrameMetadata(currentFrame.Metadata, frameData); } - Rectangle regionRectangle = frameData.Bounds; + Rectangle interest = frameData.Bounds; + bool blend = previousFrame != null && frameData.BlendingMethod == WebpBlendMethod.Over; + using Buffer2D pixelData = this.DecodeImageFrameData(frameData, webpInfo); + DrawDecodedImageFrameOnCanvas(pixelData, currentFrame, interest, blend); + + webpInfo?.Dispose(); + previousFrame = currentFrame; + prevFrameData = frameData; if (frameData.DisposalMethod is WebpDisposalMethod.RestoreToBackground) { - this.RestoreToBackground(imageFrame, backgroundColor); + this.restoreArea = interest; } - using Buffer2D decodedImageFrame = this.DecodeImageFrameData(frameData, webpInfo); - - bool blend = previousFrame != null && frameData.BlendingMethod == WebpBlendMethod.Over; - DrawDecodedImageFrameOnCanvas(decodedImageFrame, imageFrame, regionRectangle, blend); - - previousFrame = currentFrame ?? image.Frames.RootFrame; - this.restoreArea = regionRectangle; - return (uint)(stream.Position - streamStartPosition); } @@ -257,31 +294,26 @@ private Buffer2D DecodeImageFrameData(WebpFrameData frameData, W try { - Buffer2D pixelBufferDecoded = decodedFrame.PixelBuffer; + Buffer2D decodeBuffer = decodedFrame.PixelBuffer; if (webpInfo.IsLossless) { - WebpLosslessDecoder losslessDecoder = - new(webpInfo.Vp8LBitReader, this.memoryAllocator, this.configuration); - losslessDecoder.Decode(pixelBufferDecoded, (int)webpInfo.Width, (int)webpInfo.Height); + WebpLosslessDecoder losslessDecoder = new(webpInfo.Vp8LBitReader, this.memoryAllocator, this.configuration); + losslessDecoder.Decode(decodeBuffer, (int)frameData.Width, (int)frameData.Height); } else { WebpLossyDecoder lossyDecoder = new(webpInfo.Vp8BitReader, this.memoryAllocator, this.configuration); - lossyDecoder.Decode(pixelBufferDecoded, (int)webpInfo.Width, (int)webpInfo.Height, webpInfo, this.alphaData); + lossyDecoder.Decode(decodeBuffer, (int)frameData.Width, (int)frameData.Height, webpInfo, this.alphaData); } - return pixelBufferDecoded; + return decodeBuffer; } catch { decodedFrame?.Dispose(); throw; } - finally - { - webpInfo.Dispose(); - } } /// @@ -290,17 +322,17 @@ private Buffer2D DecodeImageFrameData(WebpFrameData frameData, W /// The type of the pixel. /// The decoded image. /// The image frame to draw into. - /// The area of the frame. + /// The area of the frame to draw to. /// Whether to blend the decoded frame data onto the target frame. private static void DrawDecodedImageFrameOnCanvas( Buffer2D decodedImageFrame, ImageFrame imageFrame, - Rectangle restoreArea, + Rectangle interest, bool blend) where TPixel : unmanaged, IPixel { // Trim the destination frame to match the restore area. The source frame is already trimmed. - Buffer2DRegion imageFramePixels = imageFrame.PixelBuffer.GetRegion(restoreArea); + Buffer2DRegion imageFramePixels = imageFrame.PixelBuffer.GetRegion(interest); if (blend) { // The destination frame has already been prepopulated with the pixel data from the previous frame @@ -309,10 +341,10 @@ private static void DrawDecodedImageFrameOnCanvas( PixelBlender blender = PixelOperations.Instance.GetPixelBlender(PixelColorBlendingMode.Normal, PixelAlphaCompositionMode.SrcOver); - for (int y = 0; y < restoreArea.Height; y++) + for (int y = 0; y < interest.Height; y++) { Span framePixelRow = imageFramePixels.DangerousGetRowSpan(y); - Span decodedPixelRow = decodedImageFrame.DangerousGetRowSpan(y)[..restoreArea.Width]; + Span decodedPixelRow = decodedImageFrame.DangerousGetRowSpan(y); blender.Blend(imageFrame.Configuration, framePixelRow, framePixelRow, decodedPixelRow, 1f); } @@ -320,10 +352,10 @@ private static void DrawDecodedImageFrameOnCanvas( return; } - for (int y = 0; y < restoreArea.Height; y++) + for (int y = 0; y < interest.Height; y++) { Span framePixelRow = imageFramePixels.DangerousGetRowSpan(y); - Span decodedPixelRow = decodedImageFrame.DangerousGetRowSpan(y)[..restoreArea.Width]; + Span decodedPixelRow = decodedImageFrame.DangerousGetRowSpan(y); decodedPixelRow.CopyTo(framePixelRow); } } @@ -335,7 +367,7 @@ private static void DrawDecodedImageFrameOnCanvas( /// The pixel format. /// The image frame. /// Color of the background. - private void RestoreToBackground(ImageFrame imageFrame, Color backgroundColor) + private void RestoreToBackground(ImageFrame imageFrame, TPixel backgroundColor) where TPixel : unmanaged, IPixel { if (!this.restoreArea.HasValue) @@ -345,8 +377,9 @@ private void RestoreToBackground(ImageFrame imageFrame, Color ba Rectangle interest = Rectangle.Intersect(imageFrame.Bounds(), this.restoreArea.Value); Buffer2DRegion pixelRegion = imageFrame.PixelBuffer.GetRegion(interest); - TPixel backgroundPixel = backgroundColor.ToPixel(); - pixelRegion.Fill(backgroundPixel); + pixelRegion.Fill(backgroundColor); + + this.restoreArea = null; } /// diff --git a/src/ImageSharp/Formats/Webp/WebpBlendMethod.cs b/src/ImageSharp/Formats/Webp/WebpBlendMethod.cs index f16f7650c7..6961eb8541 100644 --- a/src/ImageSharp/Formats/Webp/WebpBlendMethod.cs +++ b/src/ImageSharp/Formats/Webp/WebpBlendMethod.cs @@ -1,4 +1,4 @@ -// Copyright (c) Six Labors. +// Copyright (c) Six Labors. // Licensed under the Six Labors Split License. namespace SixLabors.ImageSharp.Formats.Webp; @@ -9,14 +9,14 @@ namespace SixLabors.ImageSharp.Formats.Webp; public enum WebpBlendMethod { /// - /// Do not blend. After disposing of the previous frame, - /// render the current frame on the canvas by overwriting the rectangle covered by the current frame. + /// Use alpha blending. After disposing of the previous frame, render the current frame on the canvas using alpha-blending. + /// If the current frame does not have an alpha channel, assume alpha value of 255, effectively replacing the rectangle. /// - Source = 0, + Over = 0, /// - /// Use alpha blending. After disposing of the previous frame, render the current frame on the canvas using alpha-blending. - /// If the current frame does not have an alpha channel, assume alpha value of 255, effectively replacing the rectangle. + /// Do not blend. After disposing of the previous frame, + /// render the current frame on the canvas by overwriting the rectangle covered by the current frame. /// - Over = 1, + Source = 1, } diff --git a/src/ImageSharp/Formats/Webp/WebpCommonUtils.cs b/src/ImageSharp/Formats/Webp/WebpCommonUtils.cs index 49482260bb..69eeab1204 100644 --- a/src/ImageSharp/Formats/Webp/WebpCommonUtils.cs +++ b/src/ImageSharp/Formats/Webp/WebpCommonUtils.cs @@ -68,7 +68,7 @@ public static WebpFrameMetadata GetWebpFrameMetadata(ImageFrame /// /// The row to check. /// Returns true if alpha has non-0xff values. - public static unsafe bool CheckNonOpaque(Span row) + public static unsafe bool CheckNonOpaque(ReadOnlySpan row) { if (Avx2.IsSupported) { diff --git a/src/ImageSharp/ImageSharp.csproj b/src/ImageSharp/ImageSharp.csproj index b08c27c41b..24b880a770 100644 --- a/src/ImageSharp/ImageSharp.csproj +++ b/src/ImageSharp/ImageSharp.csproj @@ -13,6 +13,13 @@ Image Resize Crop Gif Jpg Jpeg Bitmap Pbm Png Tga Tiff WebP NetCore A new, fully featured, fully managed, cross-platform, 2D graphics API for .NET Debug;Release + + + True + False diff --git a/src/ImageSharp/IndexedImageFrame{TPixel}.cs b/src/ImageSharp/IndexedImageFrame{TPixel}.cs index 6807e77ad2..49c9e33eb1 100644 --- a/src/ImageSharp/IndexedImageFrame{TPixel}.cs +++ b/src/ImageSharp/IndexedImageFrame{TPixel}.cs @@ -30,7 +30,7 @@ public sealed class IndexedImageFrame : IPixelSource, IDisposable /// The frame width. /// The frame height. /// The color palette. - internal IndexedImageFrame(Configuration configuration, int width, int height, ReadOnlyMemory palette) + public IndexedImageFrame(Configuration configuration, int width, int height, ReadOnlyMemory palette) { Guard.NotNull(configuration, nameof(configuration)); Guard.MustBeLessThanOrEqualTo(palette.Length, QuantizerConstants.MaxColors, nameof(palette)); @@ -42,7 +42,7 @@ internal IndexedImageFrame(Configuration configuration, int width, int height, R this.Height = height; this.pixelBuffer = configuration.MemoryAllocator.Allocate2D(width, height); - // Copy the palette over. We want the lifetime of this frame to be independant of any palette source. + // Copy the palette over. We want the lifetime of this frame to be independent of any palette source. this.paletteOwner = configuration.MemoryAllocator.Allocate(palette.Length); palette.Span.CopyTo(this.paletteOwner.GetSpan()); this.Palette = this.paletteOwner.Memory[..palette.Length]; diff --git a/src/ImageSharp/Memory/Buffer2DExtensions.cs b/src/ImageSharp/Memory/Buffer2DExtensions.cs index 2eb05ea935..ffddfcbd0e 100644 --- a/src/ImageSharp/Memory/Buffer2DExtensions.cs +++ b/src/ImageSharp/Memory/Buffer2DExtensions.cs @@ -25,6 +25,39 @@ public static IMemoryGroup GetMemoryGroup(this Buffer2D buffer) return buffer.FastMemoryGroup.View; } + /// + /// Performs a deep clone of the buffer covering the specified . + /// + /// The element type. + /// The source buffer. + /// The configuration. + /// The rectangle to clone. + /// The . + internal static Buffer2D CloneRegion(this Buffer2D source, Configuration configuration, Rectangle rectangle) + where T : unmanaged + { + Buffer2D buffer = configuration.MemoryAllocator.Allocate2D( + rectangle.Width, + rectangle.Height, + configuration.PreferContiguousImageBuffers); + + // Optimization for when the size of the area is the same as the buffer size. + Buffer2DRegion sourceRegion = source.GetRegion(rectangle); + if (sourceRegion.IsFullBufferArea) + { + sourceRegion.Buffer.FastMemoryGroup.CopyTo(buffer.FastMemoryGroup); + } + else + { + for (int y = 0; y < rectangle.Height; y++) + { + sourceRegion.DangerousGetRowSpan(y).CopyTo(buffer.DangerousGetRowSpan(y)); + } + } + + return buffer; + } + /// /// TODO: Does not work with multi-buffer groups, should be specific to Resize. /// Copy columns of inplace, diff --git a/src/ImageSharp/Processing/Processors/Dithering/PaletteDitherProcessor{TPixel}.cs b/src/ImageSharp/Processing/Processors/Dithering/PaletteDitherProcessor{TPixel}.cs index 982cc7d46c..94a23ef5fe 100644 --- a/src/ImageSharp/Processing/Processors/Dithering/PaletteDitherProcessor{TPixel}.cs +++ b/src/ImageSharp/Processing/Processors/Dithering/PaletteDitherProcessor{TPixel}.cs @@ -80,7 +80,7 @@ protected override void Dispose(bool disposing) Justification = "https://github.com/dotnet/roslyn-analyzers/issues/6151")] internal readonly struct DitherProcessor : IPaletteDitherImageProcessor, IDisposable { - private readonly EuclideanPixelMap pixelMap; + private readonly PixelMap pixelMap; [MethodImpl(InliningOptions.ShortMethod)] public DitherProcessor( @@ -89,7 +89,7 @@ public DitherProcessor( float ditherScale) { this.Configuration = configuration; - this.pixelMap = new EuclideanPixelMap(configuration, palette); + this.pixelMap = PixelMapFactory.Create(configuration, palette, ColorMatchingMode.Coarse); this.Palette = palette; this.DitherScale = ditherScale; } @@ -103,7 +103,7 @@ public DitherProcessor( [MethodImpl(InliningOptions.ShortMethod)] public TPixel GetPaletteColor(TPixel color) { - this.pixelMap.GetClosestColor(color, out TPixel match); + _ = this.pixelMap.GetClosestColor(color, out TPixel match); return match; } diff --git a/src/ImageSharp/Processing/Processors/Quantization/ColorMatchingMode.cs b/src/ImageSharp/Processing/Processors/Quantization/ColorMatchingMode.cs new file mode 100644 index 0000000000..26fd7d5d76 --- /dev/null +++ b/src/ImageSharp/Processing/Processors/Quantization/ColorMatchingMode.cs @@ -0,0 +1,28 @@ +// Copyright (c) Six Labors. +// Licensed under the Six Labors Split License. + +namespace SixLabors.ImageSharp.Processing.Processors.Quantization; + +/// +/// Defines the precision level used when matching colors during quantization. +/// +public enum ColorMatchingMode +{ + /// + /// Uses a coarse caching strategy optimized for performance at the expense of exact matches. + /// This provides the fastest matching but may yield approximate results. + /// + Coarse, + + /// + /// Enables an exact color match cache for the first 512 unique colors encountered, + /// falling back to coarse matching thereafter. + /// + Hybrid, + + /// + /// Performs exact color matching without any caching optimizations. + /// This is the slowest but most accurate matching strategy. + /// + Exact +} diff --git a/src/ImageSharp/Processing/Processors/Quantization/EuclideanPixelMap{TPixel,TCache}.cs b/src/ImageSharp/Processing/Processors/Quantization/EuclideanPixelMap{TPixel,TCache}.cs new file mode 100644 index 0000000000..a900d643bd --- /dev/null +++ b/src/ImageSharp/Processing/Processors/Quantization/EuclideanPixelMap{TPixel,TCache}.cs @@ -0,0 +1,219 @@ +// Copyright (c) Six Labors. +// Licensed under the Six Labors Split License. + +using System.Runtime.CompilerServices; +using System.Runtime.InteropServices; +using System.Runtime.Versioning; +using SixLabors.ImageSharp.PixelFormats; + +namespace SixLabors.ImageSharp.Processing.Processors.Quantization; + +/// +/// Gets the closest color to the supplied color based upon the Euclidean distance. +/// +/// The pixel format. +/// The cache type. +/// +/// This class is not thread safe and should not be accessed in parallel. +/// Doing so will result in non-idempotent results. +/// +internal sealed class EuclideanPixelMap : PixelMap + where TPixel : unmanaged, IPixel + where TCache : struct, IColorIndexCache +{ + private Rgba32[] rgbaPalette; + private int transparentIndex; + private readonly TPixel transparentMatch; + + // Do not make readonly. It's a mutable struct. +#pragma warning disable IDE0044 // Add readonly modifier + private TCache cache; +#pragma warning restore IDE0044 // Add readonly modifier + private readonly Configuration configuration; + + /// + /// Initializes a new instance of the class. + /// + /// The configuration. + /// The color palette to map from. + /// An explicit index at which to match transparent pixels. + [RequiresPreviewFeatures] + public EuclideanPixelMap( + Configuration configuration, + ReadOnlyMemory palette, + int transparentIndex = -1) + { + this.configuration = configuration; + this.cache = TCache.Create(configuration.MemoryAllocator); + + this.Palette = palette; + this.rgbaPalette = new Rgba32[palette.Length]; + PixelOperations.Instance.ToRgba32(configuration, this.Palette.Span, this.rgbaPalette); + + this.transparentIndex = transparentIndex; + Unsafe.SkipInit(out this.transparentMatch); + this.transparentMatch.FromRgba32(default); + } + + /// + [MethodImpl(InliningOptions.ShortMethod)] + public override int GetClosestColor(TPixel color, out TPixel match) + { + ref TPixel paletteRef = ref MemoryMarshal.GetReference(this.Palette.Span); + Unsafe.SkipInit(out Rgba32 rgba); + color.ToRgba32(ref rgba); + + // Check if the color is in the lookup table + if (this.cache.TryGetValue(rgba, out short index)) + { + match = Unsafe.Add(ref paletteRef, (ushort)index); + return index; + } + + return this.GetClosestColorSlow(rgba, ref paletteRef, out match); + } + + /// + public override void Clear(ReadOnlyMemory palette) + { + this.Palette = palette; + this.rgbaPalette = new Rgba32[palette.Length]; + PixelOperations.Instance.ToRgba32(this.configuration, this.Palette.Span, this.rgbaPalette); + this.transparentIndex = -1; + this.cache.Clear(); + } + + /// + public override void SetTransparentIndex(int index) + { + if (index != this.transparentIndex) + { + this.cache.Clear(); + } + + this.transparentIndex = index; + } + + [MethodImpl(InliningOptions.ColdPath)] + private int GetClosestColorSlow(Rgba32 rgba, ref TPixel paletteRef, out TPixel match) + { + // Loop through the palette and find the nearest match. + int index = 0; + + if (this.transparentIndex >= 0 && rgba == default) + { + // We have explicit instructions. No need to search. + index = this.transparentIndex; + _ = this.cache.TryAdd(rgba, (short)index); + match = this.transparentMatch; + return index; + } + + float leastDistance = float.MaxValue; + for (int i = 0; i < this.rgbaPalette.Length; i++) + { + Rgba32 candidate = this.rgbaPalette[i]; + float distance = DistanceSquared(rgba, candidate); + + // If it's an exact match, exit the loop + if (distance == 0) + { + index = i; + break; + } + + if (distance < leastDistance) + { + // Less than... assign. + index = i; + leastDistance = distance; + } + } + + // Now I have the index, pop it into the cache for next time + _ = this.cache.TryAdd(rgba, (short)index); + match = Unsafe.Add(ref paletteRef, (uint)index); + + return index; + } + + [MethodImpl(InliningOptions.ShortMethod)] + private static float DistanceSquared(Rgba32 a, Rgba32 b) + { + float deltaR = a.R - b.R; + float deltaG = a.G - b.G; + float deltaB = a.B - b.B; + float deltaA = a.A - b.A; + return (deltaR * deltaR) + (deltaG * deltaG) + (deltaB * deltaB) + (deltaA * deltaA); + } + + /// + public override void Dispose() => this.cache.Dispose(); +} + +/// +/// Represents a map of colors to indices. +/// +/// The pixel format. +internal abstract class PixelMap : IDisposable + where TPixel : unmanaged, IPixel +{ + /// + /// Gets the color palette of this . + /// + public ReadOnlyMemory Palette { get; private protected set; } + + /// + /// Returns the closest color in the palette and the index of that pixel. + /// + /// The color to match. + /// The matched color. + /// + /// The index. + /// + public abstract int GetClosestColor(TPixel color, out TPixel match); + + /// + /// Clears the map, resetting it to use the given palette. + /// + /// The color palette to map from. + public abstract void Clear(ReadOnlyMemory palette); + + /// + /// Allows setting the transparent index after construction. + /// + /// An explicit index at which to match transparent pixels. + public abstract void SetTransparentIndex(int index); + + /// + public abstract void Dispose(); +} + +/// +/// A factory for creating instances. +/// +internal static class PixelMapFactory +{ + /// + /// Creates a new instance. + /// + /// The pixel format. + /// The configuration. + /// The color palette to map from. + /// The color matching mode. + /// An explicit index at which to match transparent pixels. + /// + /// The . + /// + public static PixelMap Create( + Configuration configuration, + ReadOnlyMemory palette, + ColorMatchingMode colorMatchingMode, + int transparentIndex = -1) + where TPixel : unmanaged, IPixel => colorMatchingMode switch + { + ColorMatchingMode.Hybrid => new EuclideanPixelMap(configuration, palette, transparentIndex), + ColorMatchingMode.Exact => new EuclideanPixelMap(configuration, palette, transparentIndex), + _ => new EuclideanPixelMap(configuration, palette, transparentIndex), + }; +} diff --git a/src/ImageSharp/Processing/Processors/Quantization/EuclideanPixelMap{TPixel}.cs b/src/ImageSharp/Processing/Processors/Quantization/EuclideanPixelMap{TPixel}.cs deleted file mode 100644 index 72148374aa..0000000000 --- a/src/ImageSharp/Processing/Processors/Quantization/EuclideanPixelMap{TPixel}.cs +++ /dev/null @@ -1,260 +0,0 @@ -// Copyright (c) Six Labors. -// Licensed under the Six Labors Split License. - -using System.Buffers; -using System.Runtime.CompilerServices; -using System.Runtime.InteropServices; -using SixLabors.ImageSharp.Memory; -using SixLabors.ImageSharp.PixelFormats; - -namespace SixLabors.ImageSharp.Processing.Processors.Quantization; - -/// -/// Gets the closest color to the supplied color based upon the Euclidean distance. -/// -/// The pixel format. -/// -/// This class is not thread safe and should not be accessed in parallel. -/// Doing so will result in non-idempotent results. -/// -internal sealed class EuclideanPixelMap : IDisposable - where TPixel : unmanaged, IPixel -{ - private Rgba32[] rgbaPalette; - private int transparentIndex; - private readonly TPixel transparentMatch; - - /// - /// Do not make this readonly! Struct value would be always copied on non-readonly method calls. - /// - private ColorDistanceCache cache; - private readonly Configuration configuration; - - /// - /// Initializes a new instance of the class. - /// - /// The configuration. - /// The color palette to map from. - public EuclideanPixelMap(Configuration configuration, ReadOnlyMemory palette) - : this(configuration, palette, -1) - { - } - - /// - /// Initializes a new instance of the class. - /// - /// The configuration. - /// The color palette to map from. - /// An explicit index at which to match transparent pixels. - public EuclideanPixelMap(Configuration configuration, ReadOnlyMemory palette, int transparentIndex = -1) - { - this.configuration = configuration; - this.Palette = palette; - this.rgbaPalette = new Rgba32[palette.Length]; - this.cache = new ColorDistanceCache(configuration.MemoryAllocator); - PixelOperations.Instance.ToRgba32(configuration, this.Palette.Span, this.rgbaPalette); - - this.transparentIndex = transparentIndex; - Unsafe.SkipInit(out this.transparentMatch); - this.transparentMatch.FromRgba32(default); - } - - /// - /// Gets the color palette of this . - /// The palette memory is owned by the palette source that created it. - /// - public ReadOnlyMemory Palette { get; private set; } - - /// - /// Returns the closest color in the palette and the index of that pixel. - /// The palette contents must match the one used in the constructor. - /// - /// The color to match. - /// The matched color. - /// The index. - [MethodImpl(InliningOptions.ShortMethod)] - public int GetClosestColor(TPixel color, out TPixel match) - { - ref TPixel paletteRef = ref MemoryMarshal.GetReference(this.Palette.Span); - Unsafe.SkipInit(out Rgba32 rgba); - color.ToRgba32(ref rgba); - - // Check if the color is in the lookup table - if (!this.cache.TryGetValue(rgba, out short index)) - { - return this.GetClosestColorSlow(rgba, ref paletteRef, out match); - } - - match = Unsafe.Add(ref paletteRef, (ushort)index); - return index; - } - - /// - /// Clears the map, resetting it to use the given palette. - /// - /// The color palette to map from. - public void Clear(ReadOnlyMemory palette) - { - this.Palette = palette; - this.rgbaPalette = new Rgba32[palette.Length]; - PixelOperations.Instance.ToRgba32(this.configuration, this.Palette.Span, this.rgbaPalette); - this.transparentIndex = -1; - this.cache.Clear(); - } - - /// - /// Allows setting the transparent index after construction. - /// - /// An explicit index at which to match transparent pixels. - public void SetTransparentIndex(int index) - { - if (index != this.transparentIndex) - { - this.cache.Clear(); - } - - this.transparentIndex = index; - } - - [MethodImpl(InliningOptions.ShortMethod)] - private int GetClosestColorSlow(Rgba32 rgba, ref TPixel paletteRef, out TPixel match) - { - // Loop through the palette and find the nearest match. - int index = 0; - - if (this.transparentIndex >= 0 && rgba == default) - { - // We have explicit instructions. No need to search. - index = this.transparentIndex; - this.cache.Add(rgba, (byte)index); - match = this.transparentMatch; - return index; - } - - float leastDistance = float.MaxValue; - for (int i = 0; i < this.rgbaPalette.Length; i++) - { - Rgba32 candidate = this.rgbaPalette[i]; - float distance = DistanceSquared(rgba, candidate); - - // If it's an exact match, exit the loop - if (distance == 0) - { - index = i; - break; - } - - if (distance < leastDistance) - { - // Less than... assign. - index = i; - leastDistance = distance; - } - } - - // Now I have the index, pop it into the cache for next time - this.cache.Add(rgba, (byte)index); - match = Unsafe.Add(ref paletteRef, (uint)index); - return index; - } - - /// - /// Returns the Euclidean distance squared between two specified points. - /// - /// The first point. - /// The second point. - /// The distance squared. - [MethodImpl(InliningOptions.ShortMethod)] - private static float DistanceSquared(Rgba32 a, Rgba32 b) - { - float deltaR = a.R - b.R; - float deltaG = a.G - b.G; - float deltaB = a.B - b.B; - float deltaA = a.A - b.A; - return (deltaR * deltaR) + (deltaG * deltaG) + (deltaB * deltaB) + (deltaA * deltaA); - } - - public void Dispose() => this.cache.Dispose(); - - /// - /// A cache for storing color distance matching results. - /// - /// - /// - /// The granularity of the cache has been determined based upon the current - /// suite of test images and provides the lowest possible memory usage while - /// providing enough match accuracy. - /// Entry count is currently limited to 2335905 entries (4MB). - /// - /// - private unsafe struct ColorDistanceCache : IDisposable - { - private const int IndexRBits = 5; - private const int IndexGBits = 5; - private const int IndexBBits = 5; - private const int IndexABits = 6; - private const int IndexRCount = (1 << IndexRBits) + 1; - private const int IndexGCount = (1 << IndexGBits) + 1; - private const int IndexBCount = (1 << IndexBBits) + 1; - private const int IndexACount = (1 << IndexABits) + 1; - private const int RShift = 8 - IndexRBits; - private const int GShift = 8 - IndexGBits; - private const int BShift = 8 - IndexBBits; - private const int AShift = 8 - IndexABits; - private const int Entries = IndexRCount * IndexGCount * IndexBCount * IndexACount; - private MemoryHandle tableHandle; - private readonly IMemoryOwner table; - private readonly short* tablePointer; - - public ColorDistanceCache(MemoryAllocator allocator) - { - this.table = allocator.Allocate(Entries); - this.table.GetSpan().Fill(-1); - this.tableHandle = this.table.Memory.Pin(); - this.tablePointer = (short*)this.tableHandle.Pointer; - } - - [MethodImpl(InliningOptions.ShortMethod)] - public readonly void Add(Rgba32 rgba, byte index) - { - int idx = GetPaletteIndex(rgba); - this.tablePointer[idx] = index; - } - - [MethodImpl(InliningOptions.ShortMethod)] - public readonly bool TryGetValue(Rgba32 rgba, out short match) - { - int idx = GetPaletteIndex(rgba); - match = this.tablePointer[idx]; - return match > -1; - } - - /// - /// Clears the cache resetting each entry to empty. - /// - [MethodImpl(InliningOptions.ShortMethod)] - public readonly void Clear() => this.table.GetSpan().Fill(-1); - - [MethodImpl(InliningOptions.ShortMethod)] - private static int GetPaletteIndex(Rgba32 rgba) - { - int rIndex = rgba.R >> RShift; - int gIndex = rgba.G >> GShift; - int bIndex = rgba.B >> BShift; - int aIndex = rgba.A >> AShift; - - return (aIndex * (IndexRCount * IndexGCount * IndexBCount)) + - (rIndex * (IndexGCount * IndexBCount)) + - (gIndex * IndexBCount) + bIndex; - } - - public void Dispose() - { - if (this.table != null) - { - this.tableHandle.Dispose(); - this.table.Dispose(); - } - } - } -} diff --git a/src/ImageSharp/Processing/Processors/Quantization/IColorIndexCache.cs b/src/ImageSharp/Processing/Processors/Quantization/IColorIndexCache.cs new file mode 100644 index 0000000000..eabe9af850 --- /dev/null +++ b/src/ImageSharp/Processing/Processors/Quantization/IColorIndexCache.cs @@ -0,0 +1,377 @@ +// Copyright (c) Six Labors. +// Licensed under the Six Labors Split License. + +using System.Buffers; +using System.Runtime.CompilerServices; +using System.Runtime.Versioning; +using SixLabors.ImageSharp.Memory; +using SixLabors.ImageSharp.PixelFormats; + +namespace SixLabors.ImageSharp.Processing.Processors.Quantization; + +/// +/// Represents a cache used for efficiently retrieving palette indices for colors. +/// +/// The type of the cache. +internal interface IColorIndexCache : IColorIndexCache + where T : struct, IColorIndexCache +{ + /// + /// Creates a new instance of the cache. + /// + /// The memory allocator to use. + /// + /// The new instance of the cache. + /// +#pragma warning disable IDE0060 // Remove unused parameter + [RequiresPreviewFeatures] + public static abstract T Create(MemoryAllocator allocator); +#pragma warning restore IDE0060 // Remove unused parameter +} + +/// +/// Represents a cache used for efficiently retrieving palette indices for colors. +/// +internal interface IColorIndexCache : IDisposable +{ + /// + /// Adds a color to the cache. + /// + /// The color to add. + /// The index of the color in the palette. + /// + /// if the color was added; otherwise, . + /// + public bool TryAdd(Rgba32 color, short value); + + /// + /// Gets the index of the color in the palette. + /// + /// The color to get the index for. + /// The index of the color in the palette. + /// + /// if the color is in the palette; otherwise, . + /// + public bool TryGetValue(Rgba32 color, out short value); + + /// + /// Clears the cache. + /// + public void Clear(); +} + +/// +/// A hybrid cache for color distance lookups that combines an exact-match dictionary with +/// a fallback coarse lookup table. +/// +/// +/// This cache uses a fallback table with 2,097,152 bins, each storing a 2-byte value +/// (approximately 4 MB total), while the exact-match dictionary is limited to 512 entries +/// and occupies roughly 4 KB. Overall, the worst-case memory usage is about 4 MB. +/// Lookups and insertions are performed in constant time (O(1)) because the fallback table +/// is accessed via direct indexing and the dictionary employs a simple hash-based bucket mechanism. +/// The design achieves extremely fast color distance lookups with a predictable, fixed memory footprint. +/// +internal unsafe struct HybridCache : IColorIndexCache +{ + private AccurateCache accurateCache; + private CoarseCache coarseCache; + + [RequiresPreviewFeatures] + private HybridCache(MemoryAllocator allocator) + { + this.accurateCache = AccurateCache.Create(allocator); + this.coarseCache = CoarseCache.Create(allocator); + } + + [RequiresPreviewFeatures] + public static HybridCache Create(MemoryAllocator allocator) => new(allocator); + + [MethodImpl(InliningOptions.ShortMethod)] + public bool TryAdd(Rgba32 color, short index) + { + if (this.accurateCache.TryAdd(color, index)) + { + return true; + } + + return this.coarseCache.TryAdd(color, index); + } + + [MethodImpl(InliningOptions.ShortMethod)] + public bool TryGetValue(Rgba32 color, out short value) + { + if (this.accurateCache.TryGetValue(color, out value)) + { + return true; + } + + return this.coarseCache.TryGetValue(color, out value); + } + + public void Clear() + { + this.accurateCache.Clear(); + this.coarseCache.Clear(); + } + + public void Dispose() + { + this.accurateCache.Dispose(); + this.coarseCache.Dispose(); + } +} + +/// +/// A coarse cache for color distance lookups that uses a fixed-size lookup table. +/// +/// +/// This cache uses a fixed lookup table with 2,097,152 bins, each storing a 2-byte value, +/// resulting in a worst-case memory usage of approximately 4 MB. Lookups and insertions are +/// performed in constant time (O(1)) via direct table indexing. This design is optimized for +/// speed while maintaining a predictable, fixed memory footprint. +/// +internal unsafe struct CoarseCache : IColorIndexCache +{ + private const int IndexRBits = 5; + private const int IndexGBits = 5; + private const int IndexBBits = 5; + private const int IndexABits = 6; + private const int IndexRCount = 1 << IndexRBits; // 32 bins for red + private const int IndexGCount = 1 << IndexGBits; // 32 bins for green + private const int IndexBCount = 1 << IndexBBits; // 32 bins for blue + private const int IndexACount = 1 << IndexABits; // 64 bins for alpha + private const int TotalBins = IndexRCount * IndexGCount * IndexBCount * IndexACount; // 2,097,152 bins + + private readonly IMemoryOwner binsOwner; + private readonly short* binsPointer; + private MemoryHandle binsHandle; + + private CoarseCache(MemoryAllocator allocator) + { + this.binsOwner = allocator.Allocate(TotalBins); + this.binsOwner.GetSpan().Fill(-1); + this.binsHandle = this.binsOwner.Memory.Pin(); + this.binsPointer = (short*)this.binsHandle.Pointer; + } + + [RequiresPreviewFeatures] + public static CoarseCache Create(MemoryAllocator allocator) => new(allocator); + + [MethodImpl(InliningOptions.ShortMethod)] + public readonly bool TryAdd(Rgba32 color, short value) + { + this.binsPointer[GetCoarseIndex(color)] = value; + return true; + } + + [MethodImpl(InliningOptions.ShortMethod)] + public readonly bool TryGetValue(Rgba32 color, out short value) + { + value = this.binsPointer[GetCoarseIndex(color)]; + return value > -1; // Coarse match found + } + + [MethodImpl(InliningOptions.ShortMethod)] + private static int GetCoarseIndex(Rgba32 color) + { + int rIndex = color.R >> (8 - IndexRBits); + int gIndex = color.G >> (8 - IndexGBits); + int bIndex = color.B >> (8 - IndexBBits); + int aIndex = color.A >> (8 - IndexABits); + + return (aIndex * IndexRCount * IndexGCount * IndexBCount) + + (rIndex * IndexGCount * IndexBCount) + + (gIndex * IndexBCount) + + bIndex; + } + + public readonly void Clear() + => this.binsOwner.GetSpan().Fill(-1); + + public void Dispose() + { + this.binsHandle.Dispose(); + this.binsOwner.Dispose(); + } +} + +/// +/// A fixed-capacity dictionary with exactly 512 entries mapping a key +/// to a value. +/// +/// +/// The dictionary is implemented using a fixed array of 512 buckets and an entries array +/// of the same size. The bucket for a key is computed as (key & 0x1FF), and collisions are +/// resolved through a linked chain stored in the field. +/// The overall memory usage is approximately 4–5 KB. Both lookup and insertion operations are, +/// on average, O(1) since the bucket is determined via a simple bitmask and collision chains are +/// typically very short; in the worst-case, the number of iterations is bounded by 256. +/// This guarantees highly efficient and predictable performance for small, fixed-size color palettes. +/// +internal unsafe struct AccurateCache : IColorIndexCache +{ + // Buckets array: each bucket holds the index (0-based) into the entries array + // of the first entry in the chain, or -1 if empty. + private readonly IMemoryOwner bucketsOwner; + private MemoryHandle bucketsHandle; + private short* buckets; + + // Entries array: stores up to 256 entries. + private readonly IMemoryOwner entriesOwner; + private MemoryHandle entriesHandle; + private Entry* entries; + + private int count; + + public const int Capacity = 512; + + private AccurateCache(MemoryAllocator allocator) + { + this.count = 0; + + // Allocate exactly 512 ints for buckets. + this.bucketsOwner = allocator.Allocate(Capacity, AllocationOptions.Clean); + Span bucketSpan = this.bucketsOwner.GetSpan(); + bucketSpan.Fill(-1); + this.bucketsHandle = this.bucketsOwner.Memory.Pin(); + this.buckets = (short*)this.bucketsHandle.Pointer; + + // Allocate exactly 512 entries. + this.entriesOwner = allocator.Allocate(Capacity, AllocationOptions.Clean); + this.entriesHandle = this.entriesOwner.Memory.Pin(); + this.entries = (Entry*)this.entriesHandle.Pointer; + } + + [RequiresPreviewFeatures] + public static AccurateCache Create(MemoryAllocator allocator) => new(allocator); + + public bool TryAdd(Rgba32 color, short value) + { + if (this.count == Capacity) + { + return false; // Dictionary is full. + } + + uint key = color.PackedValue; + + // The key is a 32-bit unsigned integer representing an RGBA color, where the bytes are laid out as R|G|B|A + // (with R in the most significant byte and A in the least significant). + // To compute the bucket index: + // 1. (key >> 16) extracts the top 16 bits, effectively giving us the R and G channels. + // 2. (key >> 8) shifts the key right by 8 bits, bringing R, G, and B into the lower 24 bits (dropping A). + // 3. XORing these two values with the original key mixes bits from all four channels (R, G, B, and A), + // which helps to counteract situations where one or more channels have a limited range. + // 4. Finally, we apply a bitmask of 0x1FF to keep only the lowest 9 bits, ensuring the result is between 0 and 511, + // which corresponds to our fixed bucket count of 512. + int bucket = (int)(((key >> 16) ^ (key >> 8) ^ key) & 0x1FF); + int i = this.buckets[bucket]; + + // Traverse the collision chain. + Entry* entries = this.entries; + while (i != -1) + { + Entry e = entries[i]; + if (e.Key == key) + { + // Key already exists; do not overwrite. + return false; + } + + i = e.Next; + } + + short index = (short)this.count; + this.count++; + + // Insert the new entry: + entries[index].Key = key; + entries[index].Value = value; + + // Link this new entry into the bucket chain. + entries[index].Next = this.buckets[bucket]; + this.buckets[bucket] = index; + return true; + } + + public bool TryGetValue(Rgba32 color, out short value) + { + uint key = color.PackedValue; + int bucket = (int)(((key >> 16) ^ (key >> 8) ^ key) & 0x1FF); + int i = this.buckets[bucket]; + + // If the bucket is empty, return immediately. + if (i == -1) + { + value = -1; + return false; + } + + // Traverse the chain. + Entry* entries = this.entries; + do + { + Entry e = entries[i]; + if (e.Key == key) + { + value = e.Value; + return true; + } + + i = e.Next; + } + while (i != -1); + + value = -1; + return false; + } + + /// + /// Clears the dictionary. + /// + public void Clear() + { + Span bucketSpan = this.bucketsOwner.GetSpan(); + bucketSpan.Fill(-1); + this.count = 0; + } + + public void Dispose() + { + this.bucketsHandle.Dispose(); + this.bucketsOwner.Dispose(); + this.entriesHandle.Dispose(); + this.entriesOwner.Dispose(); + this.buckets = null; + this.entries = null; + } + + private struct Entry + { + public uint Key; // The key (packed RGBA) + public short Value; // The value; -1 means unused. + public short Next; // Index of the next entry in the chain, or -1 if none. + } +} + +internal readonly struct NullCache : IColorIndexCache +{ + [RequiresPreviewFeatures] + public static NullCache Create(MemoryAllocator allocator) => default; + + public bool TryAdd(Rgba32 color, short value) => true; + + public bool TryGetValue(Rgba32 color, out short value) + { + value = -1; + return false; + } + + public void Clear() + { + } + + public void Dispose() + { + } +} diff --git a/src/ImageSharp/Processing/Processors/Quantization/OctreeQuantizer{TPixel}.cs b/src/ImageSharp/Processing/Processors/Quantization/OctreeQuantizer{TPixel}.cs index fe422882bc..f510b102c5 100644 --- a/src/ImageSharp/Processing/Processors/Quantization/OctreeQuantizer{TPixel}.cs +++ b/src/ImageSharp/Processing/Processors/Quantization/OctreeQuantizer{TPixel}.cs @@ -28,7 +28,7 @@ public struct OctreeQuantizer : IQuantizer private readonly Octree octree; private readonly IMemoryOwner paletteOwner; private ReadOnlyMemory palette; - private EuclideanPixelMap? pixelMap; + private PixelMap? pixelMap; private readonly bool isDithering; private bool isDisposed; @@ -60,38 +60,43 @@ public OctreeQuantizer(Configuration configuration, QuantizerOptions options) public QuantizerOptions Options { get; } /// - public readonly ReadOnlyMemory Palette + public ReadOnlyMemory Palette { get { - QuantizerUtilities.CheckPaletteState(in this.palette); + if (this.palette.IsEmpty) + { + this.ResolvePalette(); + QuantizerUtilities.CheckPaletteState(in this.palette); + } + return this.palette; } } /// - public void AddPaletteColors(Buffer2DRegion pixelRegion) + public readonly void AddPaletteColors(Buffer2DRegion pixelRegion) { - using (IMemoryOwner buffer = this.Configuration.MemoryAllocator.Allocate(pixelRegion.Width)) + using IMemoryOwner buffer = this.Configuration.MemoryAllocator.Allocate(pixelRegion.Width); + Span bufferSpan = buffer.GetSpan(); + + // Loop through each row + for (int y = 0; y < pixelRegion.Height; y++) { - Span bufferSpan = buffer.GetSpan(); + Span row = pixelRegion.DangerousGetRowSpan(y); + PixelOperations.Instance.ToRgba32(this.Configuration, row, bufferSpan); - // Loop through each row - for (int y = 0; y < pixelRegion.Height; y++) + for (int x = 0; x < bufferSpan.Length; x++) { - Span row = pixelRegion.DangerousGetRowSpan(y); - PixelOperations.Instance.ToRgba32(this.Configuration, row, bufferSpan); - - for (int x = 0; x < bufferSpan.Length; x++) - { - Rgba32 rgba = bufferSpan[x]; - - // Add the color to the Octree - this.octree.AddColor(rgba); - } + // Add the color to the Octree + this.octree.AddColor(bufferSpan[x]); } } + } + [MemberNotNull(nameof(pixelMap))] + private void ResolvePalette() + { int paletteIndex = 0; Span paletteSpan = this.paletteOwner.GetSpan(); @@ -109,17 +114,7 @@ public void AddPaletteColors(Buffer2DRegion pixelRegion) this.octree.Palletize(paletteSpan, max, ref paletteIndex); ReadOnlyMemory result = this.paletteOwner.Memory[..paletteSpan.Length]; - // When called multiple times by QuantizerUtilities.BuildPalette - // this prevents memory churn caused by reallocation. - if (this.pixelMap is null) - { - this.pixelMap = new EuclideanPixelMap(this.Configuration, result); - } - else - { - this.pixelMap.Clear(result); - } - + this.pixelMap = PixelMapFactory.Create(this.Configuration, result, this.Options.ColorMatchingMode); this.palette = result; } diff --git a/src/ImageSharp/Processing/Processors/Quantization/PaletteQuantizer{TPixel}.cs b/src/ImageSharp/Processing/Processors/Quantization/PaletteQuantizer{TPixel}.cs index 3df80ea9b7..e6984ec98a 100644 --- a/src/ImageSharp/Processing/Processors/Quantization/PaletteQuantizer{TPixel}.cs +++ b/src/ImageSharp/Processing/Processors/Quantization/PaletteQuantizer{TPixel}.cs @@ -20,7 +20,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Quantization; internal readonly struct PaletteQuantizer : IQuantizer where TPixel : unmanaged, IPixel { - private readonly EuclideanPixelMap pixelMap; + private readonly PixelMap pixelMap; /// /// Initializes a new instance of the struct. @@ -41,7 +41,7 @@ public PaletteQuantizer( this.Configuration = configuration; this.Options = options; - this.pixelMap = new EuclideanPixelMap(configuration, palette, transparentIndex); + this.pixelMap = PixelMapFactory.Create(configuration, palette, options.ColorMatchingMode, transparentIndex); } /// diff --git a/src/ImageSharp/Processing/Processors/Quantization/QuantizerOptions.cs b/src/ImageSharp/Processing/Processors/Quantization/QuantizerOptions.cs index a6bb265a81..da64b26d66 100644 --- a/src/ImageSharp/Processing/Processors/Quantization/QuantizerOptions.cs +++ b/src/ImageSharp/Processing/Processors/Quantization/QuantizerOptions.cs @@ -38,4 +38,10 @@ public int MaxColors get => this.maxColors; set => this.maxColors = Numerics.Clamp(value, QuantizerConstants.MinColors, QuantizerConstants.MaxColors); } + + /// + /// Gets or sets the color matching mode used for matching pixel values to palette colors. + /// Defaults to . + /// + public ColorMatchingMode ColorMatchingMode { get; set; } = ColorMatchingMode.Coarse; } diff --git a/src/ImageSharp/Processing/Processors/Quantization/WuQuantizer{TPixel}.cs b/src/ImageSharp/Processing/Processors/Quantization/WuQuantizer{TPixel}.cs index f6928c3dd4..5eebb5b6de 100644 --- a/src/ImageSharp/Processing/Processors/Quantization/WuQuantizer{TPixel}.cs +++ b/src/ImageSharp/Processing/Processors/Quantization/WuQuantizer{TPixel}.cs @@ -75,7 +75,7 @@ internal struct WuQuantizer : IQuantizer private ReadOnlyMemory palette; private int maxColors; private readonly Box[] colorCube; - private EuclideanPixelMap? pixelMap; + private PixelMap? pixelMap; private readonly bool isDithering; private bool isDisposed; @@ -111,35 +111,43 @@ public WuQuantizer(Configuration configuration, QuantizerOptions options) public QuantizerOptions Options { get; } /// - public readonly ReadOnlyMemory Palette + public ReadOnlyMemory Palette { get { - QuantizerUtilities.CheckPaletteState(in this.palette); + if (this.palette.IsEmpty) + { + this.ResolvePalette(); + QuantizerUtilities.CheckPaletteState(in this.palette); + } + return this.palette; } } /// - public void AddPaletteColors(Buffer2DRegion pixelRegion) + public readonly void AddPaletteColors(Buffer2DRegion pixelRegion) + => this.Build3DHistogram(pixelRegion); + + /// + /// Once all histogram data has been accumulated, this method computes the moments, + /// splits the color cube, and resolves the final palette from the accumulated histogram. + /// + private void ResolvePalette() { - // TODO: Something is destroying the existing palette when adding new colors. - // When the QuantizingImageEncoder.PixelSamplingStrategy is DefaultPixelSamplingStrategy - // this leads to performance issues + the palette is not preserved. - // https://github.com/SixLabors/ImageSharp/issues/2498 - this.Build3DHistogram(pixelRegion); + // Calculate the cumulative moments from the accumulated histogram. this.Get3DMoments(this.memoryAllocator); + + // Partition the histogram into color cubes. this.BuildCube(); - // Slice again since maxColors has been updated since the buffer was created. + // Compute the palette colors from the resolved cubes. Span paletteSpan = this.paletteOwner.GetSpan()[..this.maxColors]; ReadOnlySpan momentsSpan = this.momentsOwner.GetSpan(); for (int k = 0; k < paletteSpan.Length; k++) { this.Mark(ref this.colorCube[k], (byte)k); - Moment moment = Volume(ref this.colorCube[k], momentsSpan); - if (moment.Weight > 0) { ref TPixel color = ref paletteSpan[k]; @@ -147,22 +155,14 @@ public void AddPaletteColors(Buffer2DRegion pixelRegion) } } - ReadOnlyMemory result = this.paletteOwner.Memory[..paletteSpan.Length]; - if (this.isDithering) + // Update the palette to the new computed colors. + this.palette = this.paletteOwner.Memory[..paletteSpan.Length]; + + // Create the pixel map if dithering is enabled. + if (this.isDithering && this.pixelMap is null) { - // When called multiple times by QuantizerUtilities.BuildPalette - // this prevents memory churn caused by reallocation. - if (this.pixelMap is null) - { - this.pixelMap = new EuclideanPixelMap(this.Configuration, result); - } - else - { - this.pixelMap.Clear(result); - } + this.pixelMap = PixelMapFactory.Create(this.Configuration, this.palette, this.Options.ColorMatchingMode); } - - this.palette = result; } /// @@ -549,7 +549,7 @@ private readonly float Maximize(ref Box cube, int direction, int first, int last /// The first set. /// The second set. /// Returns a value indicating whether the box has been split. - private bool Cut(ref Box set1, ref Box set2) + private readonly bool Cut(ref Box set1, ref Box set2) { ReadOnlySpan momentSpan = this.momentsOwner.GetSpan(); Moment whole = Volume(ref set1, momentSpan); diff --git a/src/ImageSharp/Properties/AssemblyInfo.cs b/src/ImageSharp/Properties/AssemblyInfo.cs deleted file mode 100644 index 334737ac17..0000000000 --- a/src/ImageSharp/Properties/AssemblyInfo.cs +++ /dev/null @@ -1,9 +0,0 @@ -// Copyright (c) Six Labors. -// Licensed under the Six Labors Split License. - -// Redundant suppressing of SA1413 for Rider. -[assembly: - System.Diagnostics.CodeAnalysis.SuppressMessage( - "StyleCop.CSharp.MaintainabilityRules", - "SA1413:UseTrailingCommasInMultiLineInitializers", - Justification = "Follows SixLabors.ruleset")] diff --git a/tests/ImageSharp.Benchmarks/Codecs/Gif/DecodeEncodeGif.cs b/tests/ImageSharp.Benchmarks/Codecs/Gif/DecodeEncodeGif.cs new file mode 100644 index 0000000000..06b07c3187 --- /dev/null +++ b/tests/ImageSharp.Benchmarks/Codecs/Gif/DecodeEncodeGif.cs @@ -0,0 +1,59 @@ +// Copyright (c) Six Labors. +// Licensed under the Six Labors Split License. + +using System.Drawing.Imaging; +using BenchmarkDotNet.Attributes; +using SixLabors.ImageSharp.Formats.Gif; +using SixLabors.ImageSharp.Processing; +using SixLabors.ImageSharp.Processing.Processors.Quantization; +using SixLabors.ImageSharp.Tests; +using SDImage = System.Drawing.Image; + +namespace SixLabors.ImageSharp.Benchmarks.Codecs; + +public abstract class DecodeEncodeGif +{ + private Stream outputStream; + + protected abstract GifEncoder Encoder { get; } + + [Params(TestImages.Gif.Leo, TestImages.Gif.Cheers)] + public string TestImage { get; set; } + + private string TestImageFullPath => Path.Combine(TestEnvironment.InputImagesDirectoryFullPath, this.TestImage); + + [GlobalSetup] + public void Setup() => this.outputStream = new MemoryStream(); + + [GlobalCleanup] + public void Cleanup() => this.outputStream.Close(); + + [Benchmark(Baseline = true)] + public void SystemDrawing() + { + this.outputStream.Position = 0; + using SDImage image = SDImage.FromFile(this.TestImageFullPath); + image.Save(this.outputStream, ImageFormat.Gif); + } + + [Benchmark] + public void ImageSharp() + { + this.outputStream.Position = 0; + using Image image = Image.Load(this.TestImageFullPath); + image.SaveAsGif(this.outputStream, this.Encoder); + } +} + +public class DecodeEncodeGif_DefaultEncoder : DecodeEncodeGif +{ + protected override GifEncoder Encoder => new(); +} + +public class DecodeEncodeGif_CoarsePaletteEncoder : DecodeEncodeGif +{ + protected override GifEncoder Encoder => new() + { + Quantizer = new WebSafePaletteQuantizer(new QuantizerOptions { Dither = KnownDitherings.Bayer4x4, ColorMatchingMode = ColorMatchingMode.Coarse }) + }; +} diff --git a/tests/ImageSharp.Benchmarks/Codecs/Gif/EncodeGif.cs b/tests/ImageSharp.Benchmarks/Codecs/Gif/EncodeGif.cs index 048c2aadda..d11cb3218b 100644 --- a/tests/ImageSharp.Benchmarks/Codecs/Gif/EncodeGif.cs +++ b/tests/ImageSharp.Benchmarks/Codecs/Gif/EncodeGif.cs @@ -12,21 +12,16 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs; -[Config(typeof(Config.ShortMultiFramework))] -public class EncodeGif +public abstract class EncodeGif { // System.Drawing needs this. private Stream bmpStream; private SDImage bmpDrawing; private Image bmpCore; - // Try to get as close to System.Drawing's output as possible - private readonly GifEncoder encoder = new GifEncoder - { - Quantizer = new WebSafePaletteQuantizer(new QuantizerOptions { Dither = KnownDitherings.Bayer4x4 }) - }; + protected abstract GifEncoder Encoder { get; } - [Params(TestImages.Bmp.Car, TestImages.Png.Rgb48Bpp)] + [Params(TestImages.Gif.Leo, TestImages.Gif.Cheers)] public string TestImage { get; set; } [GlobalSetup] @@ -61,6 +56,19 @@ public void GifSystemDrawing() public void GifImageSharp() { using var memoryStream = new MemoryStream(); - this.bmpCore.SaveAsGif(memoryStream, this.encoder); + this.bmpCore.SaveAsGif(memoryStream, this.Encoder); } } + +public class EncodeGif_DefaultEncoder : EncodeGif +{ + protected override GifEncoder Encoder => new(); +} + +public class EncodeGif_CoarsePaletteEncoder : EncodeGif +{ + protected override GifEncoder Encoder => new() + { + Quantizer = new WebSafePaletteQuantizer(new QuantizerOptions { Dither = KnownDitherings.Bayer4x4, ColorMatchingMode = ColorMatchingMode.Coarse }) + }; +} diff --git a/tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs b/tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs index bc6eeedcbe..dcce56e881 100644 --- a/tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs +++ b/tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs @@ -34,6 +34,41 @@ public void Decode_VerifyAllFrames(TestImageProvider provider) image.CompareToReferenceOutputMultiFrame(provider, ImageComparer.Exact); } + [Theory] + [WithFile(TestImages.Gif.AnimatedLoop, PixelTypes.Rgba32)] + [WithFile(TestImages.Gif.AnimatedLoopInterlaced, PixelTypes.Rgba32)] + public void Decode_Animated(TestImageProvider provider) + where TPixel : unmanaged, IPixel + { + using Image image = provider.GetImage(); + image.DebugSaveMultiFrame(provider); + image.CompareToReferenceOutputMultiFrame(provider, ImageComparer.Exact); + } + + [Theory] + [WithFile(TestImages.Gif.AnimatedTransparentNoRestore, PixelTypes.Rgba32)] + [WithFile(TestImages.Gif.AnimatedTransparentRestorePrevious, PixelTypes.Rgba32)] + [WithFile(TestImages.Gif.AnimatedTransparentLoop, PixelTypes.Rgba32)] + [WithFile(TestImages.Gif.AnimatedTransparentFirstFrameRestorePrev, PixelTypes.Rgba32)] + public void Decode_Animated_WithTransparency(TestImageProvider provider) + where TPixel : unmanaged, IPixel + { + using Image image = provider.GetImage(); + image.DebugSaveMultiFrame(provider); + image.CompareToReferenceOutputMultiFrame(provider, ImageComparer.Exact); + } + + [Theory] + [WithFile(TestImages.Gif.StaticNontransparent, PixelTypes.Rgba32)] + [WithFile(TestImages.Gif.StaticTransparent, PixelTypes.Rgba32)] + public void Decode_Static_No_Animation(TestImageProvider provider) + where TPixel : unmanaged, IPixel + { + using Image image = provider.GetImage(); + image.DebugSave(provider); + image.CompareFirstFrameToReferenceOutput(ImageComparer.Exact, provider); + } + [Theory] [WithFile(TestImages.Gif.Issues.Issue2450_A, PixelTypes.Rgba32)] [WithFile(TestImages.Gif.Issues.Issue2450_B, PixelTypes.Rgba32)] diff --git a/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs index a7e16f7737..dcbd4b38eb 100644 --- a/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs +++ b/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs @@ -382,4 +382,21 @@ public void Encode_Animated_VisualTest(TestImageProvider provide provider.Utility.SaveTestOutputFile(image, "png", new PngEncoder(), "animated"); provider.Utility.SaveTestOutputFile(image, "gif", new GifEncoder(), "animated"); } + + [Theory] + [WithFile(TestImages.Gif.Issues.Issue2866, PixelTypes.Rgba32)] + public void GifEncoder_CanDecode_AndEncode_Issue2866(TestImageProvider provider) + where TPixel : unmanaged, IPixel + { + using Image image = provider.GetImage(); + + // Save the image for visual inspection. + provider.Utility.SaveTestOutputFile(image, "gif", new GifEncoder(), "animated"); + + // Now compare the debug output with the reference output. + // We do this because the gif encoding is lossy and encoding will lead to differences in the 10s of percent. + // From the unencoded image, we can see that the image is visually the same. + static bool Predicate(int i, int _) => i % 8 == 0; // Image has many frames, only compare a selection of them. + image.CompareDebugOutputToReferenceOutputMultiFrame(provider, ImageComparer.Exact, extension: "gif", predicate: Predicate); + } } diff --git a/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs index ca5aae961c..c94413cb69 100644 --- a/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs +++ b/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs @@ -449,6 +449,7 @@ public void Encode_WithPngTransparentColorBehaviorClear_Works(PngColorType color [WithFile(TestImages.Png.APng, PixelTypes.Rgba32)] [WithFile(TestImages.Png.DefaultNotAnimated, PixelTypes.Rgba32)] [WithFile(TestImages.Png.FrameOffset, PixelTypes.Rgba32)] + [WithFile(TestImages.Png.Issue2882, PixelTypes.Rgba32)] public void Encode_APng(TestImageProvider provider) where TPixel : unmanaged, IPixel { @@ -484,8 +485,9 @@ public void Encode_APng(TestImageProvider provider) } [Theory] - [WithFile(TestImages.Gif.Leo, PixelTypes.Rgba32)] - public void Encode_AnimatedFormatTransform_FromGif(TestImageProvider provider) + [WithFile(TestImages.Gif.Leo, PixelTypes.Rgba32, 0.7921F)] + [WithFile(TestImages.Gif.Issues.Issue2866, PixelTypes.Rgba32, 1.06F)] + public void Encode_AnimatedFormatTransform_FromGif(TestImageProvider provider, float percentage) where TPixel : unmanaged, IPixel { if (TestEnvironment.RunsOnCI && !TestEnvironment.IsWindows) @@ -494,17 +496,18 @@ public void Encode_AnimatedFormatTransform_FromGif(TestImageProvider image = provider.GetImage(GifDecoder.Instance); - using MemoryStream memStream = new(); image.Save(memStream, PngEncoder); memStream.Position = 0; + image.DebugSave(provider: provider, extension: "png", encoder: PngEncoder); + using Image output = Image.Load(memStream); // TODO: Find a better way to compare. - // The image has been visually checked but the quantization pattern used in the png encoder - // means we cannot use an exact comparison nor replicate using the quantizing processor. - ImageComparer.TolerantPercentage(0.613f).VerifySimilarity(output, image); + // The image has been visually checked but the coarse cache used by the palette quantizer + // can lead to minor differences between frames. + ImageComparer.TolerantPercentage(percentage).VerifySimilarity(output, image); GifMetadata gif = image.Metadata.GetGifMetadata(); PngMetadata png = output.Metadata.GetPngMetadata(); @@ -699,6 +702,39 @@ public void Issue2668_Quantized_Encode_Alpha(TestImageProvider p encoded.CompareToReferenceOutput(ImageComparer.Exact, provider); } + [Fact] + public void Issue_2862() + { + // Create a grayscale palette (or any other palette with colors that are very close to each other): + Rgba32[] palette = Enumerable.Range(0, 256).Select(i => new Rgba32((byte)i, (byte)i, (byte)i)).ToArray(); + + using Image image = new(254, 4); + for (int y = 0; y < image.Height; y++) + { + for (int x = 0; x < image.Width; x++) + { + image[x, y] = palette[x]; + } + } + + using MemoryStream ms = new(); + PaletteQuantizer quantizer = new( + palette.Select(Color.FromPixel).ToArray(), + new QuantizerOptions() { ColorMatchingMode = ColorMatchingMode.Hybrid }); + + image.Save(ms, new PngEncoder + { + ColorType = PngColorType.Palette, + BitDepth = PngBitDepth.Bit8, + Quantizer = quantizer + }); + + ms.Position = 0; + + using Image encoded = Image.Load(ms); + ImageComparer.Exact.VerifySimilarity(image, encoded); + } + private static void TestPngEncoderCore( TestImageProvider provider, PngColorType pngColorType, diff --git a/tests/ImageSharp.Tests/Formats/WebP/WebpCommonUtilsTests.cs b/tests/ImageSharp.Tests/Formats/WebP/WebpCommonUtilsTests.cs index a3fe028db5..1491cd13cf 100644 --- a/tests/ImageSharp.Tests/Formats/WebP/WebpCommonUtilsTests.cs +++ b/tests/ImageSharp.Tests/Formats/WebP/WebpCommonUtilsTests.cs @@ -106,7 +106,7 @@ private static void RunCheckNoneOpaqueWithNoneOpaquePixelsTest() 174, 183, 189, 255, 148, 158, 158, 255, }; - Span row = MemoryMarshal.Cast(rowBytes); + ReadOnlySpan row = MemoryMarshal.Cast(rowBytes); bool noneOpaque; for (int length = 8; length < row.Length; length += 8) @@ -188,7 +188,7 @@ private static void RunCheckNoneOpaqueWithOpaquePixelsTest() 174, 183, 189, 255, 148, 158, 158, 255, }; - Span row = MemoryMarshal.Cast(rowBytes); + ReadOnlySpan row = MemoryMarshal.Cast(rowBytes); bool noneOpaque; for (int length = 8; length < row.Length; length += 8) diff --git a/tests/ImageSharp.Tests/Formats/WebP/WebpDecoderTests.cs b/tests/ImageSharp.Tests/Formats/WebP/WebpDecoderTests.cs index 0dda304b64..29362105db 100644 --- a/tests/ImageSharp.Tests/Formats/WebP/WebpDecoderTests.cs +++ b/tests/ImageSharp.Tests/Formats/WebP/WebpDecoderTests.cs @@ -450,6 +450,22 @@ public void WebpDecoder_CanDecode_Issue2670(TestImageProvider pr image.CompareToOriginal(provider, ReferenceDecoder); } + // https://github.com/SixLabors/ImageSharp/issues/2866 + [Theory] + [WithFile(Lossy.Issue2866, PixelTypes.Rgba32)] + public void WebpDecoder_CanDecode_Issue2866(TestImageProvider provider) + where TPixel : unmanaged, IPixel + { + // Web + using Image image = provider.GetImage( + WebpDecoder.Instance, + new WebpDecoderOptions() { BackgroundColorHandling = BackgroundColorHandling.Ignore }); + + // We can't use the reference decoder here. + // It creates frames of different size without blending the frames. + image.DebugSave(provider, extension: "webp", encoder: new WebpEncoder()); + } + [Theory] [WithFile(Lossless.LossLessCorruptImage3, PixelTypes.Rgba32)] public void WebpDecoder_ThrowImageFormatException_OnInvalidImages(TestImageProvider provider) diff --git a/tests/ImageSharp.Tests/Image/ImageFrameTests.cs b/tests/ImageSharp.Tests/Image/ImageFrameTests.cs index 3b9779ea42..baa8ca699a 100644 --- a/tests/ImageSharp.Tests/Image/ImageFrameTests.cs +++ b/tests/ImageSharp.Tests/Image/ImageFrameTests.cs @@ -119,7 +119,7 @@ public void CopyPixelDataTo_Success(bool disco, bool byteSpan) } else { - Span destination = MemoryMarshal.Cast(actual); + Span destination = MemoryMarshal.Cast(actual.AsSpan()); image.Frames.RootFrame.CopyPixelDataTo(destination); } diff --git a/tests/ImageSharp.Tests/Image/ImageTests.cs b/tests/ImageSharp.Tests/Image/ImageTests.cs index ca51f7f5cb..6d68e1ab94 100644 --- a/tests/ImageSharp.Tests/Image/ImageTests.cs +++ b/tests/ImageSharp.Tests/Image/ImageTests.cs @@ -197,7 +197,7 @@ public void CopyPixelDataTo_Success(bool disco, bool byteSpan) } else { - Span destination = MemoryMarshal.Cast(actual); + Span destination = MemoryMarshal.Cast(actual.AsSpan()); image.CopyPixelDataTo(destination); } diff --git a/tests/ImageSharp.Tests/TestImages.cs b/tests/ImageSharp.Tests/TestImages.cs index fa3f38799a..0974bab6dd 100644 --- a/tests/ImageSharp.Tests/TestImages.cs +++ b/tests/ImageSharp.Tests/TestImages.cs @@ -76,6 +76,7 @@ public static class Png public const string FrameOffset = "Png/animated/frame-offset.png"; public const string DefaultNotAnimated = "Png/animated/default-not-animated.png"; public const string Issue2666 = "Png/issues/Issue_2666.png"; + public const string Issue2882 = "Png/issues/Issue_2882.png"; // Filtered test images from http://www.schaik.com/pngsuite/pngsuite_fil_png.html public const string Filter0 = "Png/filter0.png"; @@ -507,6 +508,31 @@ public static class Gif public const string Bit18RGBCube = "Gif/18-bit_RGB_Cube.gif"; public const string Global256NoTrans = "Gif/global-256-no-trans.gif"; + // Test imagages from: https://github.com/peterdn/gif-test-suite.git + // Animated gif with 4 frames, looping forever, no transparency. + public const string AnimatedLoop = "Gif/animated_loop.gif"; + + // Animated gif with 4 frames, interlaced, looping forever, no transparency. + public const string AnimatedLoopInterlaced = "Gif/animated_loop_interlaced.gif"; + + // Transparent gif with 4 frames, loops forever. + public const string AnimatedTransparentLoop = "Gif/animated_transparent_loop.gif"; + + // Transparent gif with 4 frames, loops forever, first frame restore previous. + public const string AnimatedTransparentFirstFrameRestorePrev = "Gif/animated_transparent_firstframerestoreprev_loop.gif"; + + // Transparent gif with 4 transparent frames, loops forever, no dispose + public const string AnimatedTransparentNoRestore = "Gif/animated_transparent_frame_norestore_loop.gif"; + + // Transparent gif with 4 transparent frames, loops forever, restore previous. + public const string AnimatedTransparentRestorePrevious = "Gif/animated_transparent_frame_restoreprev_loop.gif"; + + // Static gif with no animation, no transparency. + public const string StaticNontransparent = "Gif/static_nontransparent.gif"; + + // Static transparent gif with no animation. + public const string StaticTransparent = "Gif/static_transparent.gif"; + // Test images from https://github.com/robert-ancell/pygif/tree/master/test-suite public const string ZeroSize = "Gif/image-zero-size.gif"; public const string ZeroHeight = "Gif/image-zero-height.gif"; @@ -535,6 +561,7 @@ public static class Issues public const string Issue2450_B = "Gif/issues/issue_2450_2.gif"; public const string Issue2198 = "Gif/issues/issue_2198.gif"; public const string Issue2758 = "Gif/issues/issue_2758.gif"; + public const string Issue2866 = "Gif/issues/issue_2866.gif"; public const string Issue2859_A = "Gif/issues/issue_2859_A.gif"; public const string Issue2859_B = "Gif/issues/issue_2859_B.gif"; } @@ -827,6 +854,7 @@ public static class Lossy public const string Issue2670 = "Webp/issues/Issue2670.webp"; public const string Issue2763 = "Webp/issues/Issue2763.png"; public const string Issue2801 = "Webp/issues/Issue2801.webp"; + public const string Issue2866 = "Webp/issues/Issue2866.webp"; } } diff --git a/tests/ImageSharp.Tests/TestUtilities/ReferenceCodecs/MagickReferenceDecoder.cs b/tests/ImageSharp.Tests/TestUtilities/ReferenceCodecs/MagickReferenceDecoder.cs index 80b5536ebd..a06e19594d 100644 --- a/tests/ImageSharp.Tests/TestUtilities/ReferenceCodecs/MagickReferenceDecoder.cs +++ b/tests/ImageSharp.Tests/TestUtilities/ReferenceCodecs/MagickReferenceDecoder.cs @@ -44,26 +44,33 @@ protected override Image Decode(DecoderOptions options, Stream s settings.SetDefines(pngReadDefines); using MagickImageCollection magickImageCollection = new(stream, settings); + int imageWidth = magickImageCollection.Max(x => x.Width); + int imageHeight = magickImageCollection.Max(x => x.Height); + List> framesList = new(); foreach (IMagickImage magicFrame in magickImageCollection) { - ImageFrame frame = new(configuration, magicFrame.Width, magicFrame.Height); + ImageFrame frame = new(configuration, imageWidth, imageHeight); framesList.Add(frame); - MemoryGroup framePixels = frame.PixelBuffer.FastMemoryGroup; + Buffer2DRegion buffer = frame.PixelBuffer.GetRegion( + imageWidth - magicFrame.Width, + imageHeight - magicFrame.Height, + magicFrame.Width, + magicFrame.Height); using IUnsafePixelCollection pixels = magicFrame.GetPixelsUnsafe(); if (magicFrame.Depth is 12 or 10 or 8 or 6 or 5 or 4 or 3 or 2 or 1) { byte[] data = pixels.ToByteArray(PixelMapping.RGBA); - FromRgba32Bytes(configuration, data, framePixels); + FromRgba32Bytes(configuration, data, buffer); } else if (magicFrame.Depth is 16 or 14) { ushort[] data = pixels.ToShortArray(PixelMapping.RGBA); Span bytes = MemoryMarshal.Cast(data.AsSpan()); - FromRgba64Bytes(configuration, bytes, framePixels); + FromRgba64Bytes(configuration, bytes, buffer); } else { @@ -83,32 +90,40 @@ protected override ImageInfo Identify(DecoderOptions options, Stream stream, Can return new(image.PixelType, image.Size, image.Metadata, new List(image.Frames.Select(x => x.Metadata))); } - private static void FromRgba32Bytes(Configuration configuration, Span rgbaBytes, IMemoryGroup destinationGroup) + private static void FromRgba32Bytes( + Configuration configuration, + Span rgbaBytes, + Buffer2DRegion destinationGroup) where TPixel : unmanaged, ImageSharp.PixelFormats.IPixel { Span sourcePixels = MemoryMarshal.Cast(rgbaBytes); - foreach (Memory m in destinationGroup) + for (int y = 0; y < destinationGroup.Height; y++) { - Span destBuffer = m.Span; + Span destBuffer = destinationGroup.DangerousGetRowSpan(y); PixelOperations.Instance.FromRgba32( configuration, sourcePixels[..destBuffer.Length], destBuffer); + sourcePixels = sourcePixels[destBuffer.Length..]; } } - private static void FromRgba64Bytes(Configuration configuration, Span rgbaBytes, IMemoryGroup destinationGroup) + private static void FromRgba64Bytes( + Configuration configuration, + Span rgbaBytes, + Buffer2DRegion destinationGroup) where TPixel : unmanaged, ImageSharp.PixelFormats.IPixel { - foreach (Memory m in destinationGroup) + for (int y = 0; y < destinationGroup.Height; y++) { - Span destBuffer = m.Span; + Span destBuffer = destinationGroup.DangerousGetRowSpan(y); PixelOperations.Instance.FromRgba64Bytes( configuration, rgbaBytes, destBuffer, destBuffer.Length); + rgbaBytes = rgbaBytes[(destBuffer.Length * 8)..]; } } diff --git a/tests/ImageSharp.Tests/TestUtilities/TestImageExtensions.cs b/tests/ImageSharp.Tests/TestUtilities/TestImageExtensions.cs index 3c74b48938..01d3b64891 100644 --- a/tests/ImageSharp.Tests/TestUtilities/TestImageExtensions.cs +++ b/tests/ImageSharp.Tests/TestUtilities/TestImageExtensions.cs @@ -277,6 +277,45 @@ public static Image CompareFirstFrameToReferenceOutput( return image; } + public static Image CompareDebugOutputToReferenceOutputMultiFrame( + this Image image, + ITestImageProvider provider, + ImageComparer comparer, + object testOutputDetails = null, + string extension = "png", + bool appendPixelTypeToFileName = true, + Func predicate = null) + where TPixel : unmanaged, IPixel + { + image.DebugSaveMultiFrame( + provider, + testOutputDetails, + extension, + appendPixelTypeToFileName, + predicate: predicate); + + using (Image debugImage = GetDebugOutputImageMultiFrame( + provider, + image.Frames.Count, + testOutputDetails, + extension, + appendPixelTypeToFileName, + predicate: predicate)) + + using (Image referenceImage = GetReferenceOutputImageMultiFrame( + provider, + image.Frames.Count, + testOutputDetails, + extension, + appendPixelTypeToFileName, + predicate: predicate)) + { + comparer.VerifySimilarity(referenceImage, debugImage); + } + + return image; + } + public static Image CompareToReferenceOutputMultiFrame( this Image image, ITestImageProvider provider, @@ -375,6 +414,54 @@ public static Image GetReferenceOutputImageMultiFrame( return result; } + public static Image GetDebugOutputImageMultiFrame( + this ITestImageProvider provider, + int frameCount, + object testOutputDetails = null, + string extension = "png", + bool appendPixelTypeToFileName = true, + Func predicate = null) + where TPixel : unmanaged, IPixel + { + (int Index, string FileName)[] frameFiles = provider.Utility.GetTestOutputFileNamesMultiFrame( + frameCount, + extension, + testOutputDetails, + appendPixelTypeToFileName, + predicate: predicate).ToArray(); + + List> temporaryFrameImages = new(); + + IImageDecoder decoder = TestEnvironment.GetReferenceDecoder(frameFiles[0].FileName); + + for (int i = 0; i < frameFiles.Length; i++) + { + string path = frameFiles[i].FileName; + if (!File.Exists(path)) + { + throw new FileNotFoundException("Reference output file missing: " + path); + } + + using FileStream stream = File.OpenRead(path); + Image tempImage = decoder.Decode(DecoderOptions.Default, stream); + temporaryFrameImages.Add(tempImage); + } + + Image firstTemp = temporaryFrameImages[0]; + + Image result = new(firstTemp.Width, firstTemp.Height); + + foreach (Image fi in temporaryFrameImages) + { + result.Frames.AddFrame(fi.Frames.RootFrame); + fi.Dispose(); + } + + // Remove the initial empty frame: + result.Frames.RemoveFrame(0); + return result; + } + public static IEnumerable GetReferenceOutputSimilarityReports( this Image image, ITestImageProvider provider, diff --git a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_CalliphoraPartial_Atkinson.png b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_CalliphoraPartial_Atkinson.png index cc2327b23f..70acb3f32e 100644 --- a/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_CalliphoraPartial_Atkinson.png +++ b/tests/Images/External/ReferenceOutput/DitherTests/DiffusionFilter_WorksWithAllErrorDiffusers_CalliphoraPartial_Atkinson.png @@ -1,3 +1,3 @@ version https://git-lfs.github.com/spec/v1 -oid sha256:7e22401dddf6552cd91517c1cdd142d3b9a66a7ad5c80d2e52ae07a7f583708e -size 57657 +oid sha256:e44c49a8f2ab1280c38e6ba71da29a93803b2aa4cf117e1e919909521b0373e6 +size 57636 diff --git 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