DrawingCanvas API: Replace imperative extension methods with stateful canvas-based drawing model (#377)

* Migrate SolidBrush tests

* Migrate SweetGradientBrush tests

* Migrate RecolorBrush tests

* Migrate SolidBezier tests

* Migrate Blending tests

* Migrate Clip tests

* Migrate robustness tests

* Migrate Issues tests

* Migrate SVGPath tests

* Cleanup references

* Optimize refs

* Remove legacy APIs

* Fix build

* Update ImageSharp.Drawing.sln

* Include binaries use streaming for composition

* Update ImageSharp.Drawing.Tests.csproj

* Use tolerance comparer

* Update DrawingCanvasTests.RegionAndState.cs

* Skip WebGPU drawing tests on Linux

* Skip WebGPU tests for all CI

* Remove rasterizer config

* Replace PolygonScanner with DefaultRasterizer and optimize

* Feng shui all the things.

* Remove unused type

* Reuse WorkerScratch across rasterizer calls + optimizations

* Fix tile mapping and dispatch dimensions

* Use output texture for readback to avoid copy

* Add CSR shaders; restructure WebGPU shaders & tests

* Switch to CSR-based composite shaders

* Add start_cover fast path; skip outside edges

* Compute CSR on CPU; refactor coverage rasterizer

* Update DrawingCanvasTests.Process.cs

* Switch edge buffers to IMemoryOwner

* Pre-split edges into band-sorted buffers (remove CSR)

* Add small-geometry fast path to rasterizer

* Update reference images

* Update Draw_NormalizeOutputFalse_MatchesReference_Rgba32.png

* Bump tolerance

* Fix #344

* Fix #367

* Fix #244

* Add AntialiasThreshold and aliased mode

* Remove FillPath API from drawing backends

* Add WebGPUWindowDemo and backend feature checks

* Make API public

* Remove NormalizeOutput

* Move stroking to the GPU

* Add GPU stroke expand shader & refactor strokes

* Add per-band stroke rasterization and StrokeEdgeFlags

* Update docs

* Update reference images

* GPU: add gradient, pattern & recolor brushes

* Replace DashPathSplitter with GenerateDashes extension

* Add ReleaseFrameResources and WebGPU CPU cache key

* Add new text measuring tests

* Migrate drawing transforms to Matrix4x4

* Attempt to run WebGPU tests in CI

* Use explicit theory with runtime support check

* Update build-and-test.yml

* Cache WebGPU support and gate drawing backend

* Use PNG for comparison

* Update WebGPUDrawingBackendTests.cs

* Remove duplicate assertion

* Verify WebGPU compute pipeline in ProbeSupport

* Add RemoteExecutor and WebGPU probe

* Add missing tests.

* Add GPU layer compositing and shared WGSL snippets

* Remove reference codecs and simplify tests

* Add pre-flattened paths and FlattenAndTransform helper

* Optimize Bezier subdivision and list allocation

* Use IMemoryOwner for edge and band offset buffers

* Cleanup

* Use auto-properties; drop isRoot flag

* Add no AA rectangle tests

* Remove some copying.

* Update dependencies

* Refactor path flattening and remove tessellation

* Handle different separators in SVG parsing

* Cache flattening properly.

* Refactor CPU to actually follow architecture

* Refactor composition preparation and batching

* Fix orientation, update ref output

* Update refs

* semi-reasonable performance

* Update FlushScene.cs

* Remove GeometryPreparationCache and cache bands

* Remove obsolete enforceFillOrientation flag

* Remove enforceFillOrientation; simplify Reverse

* Reimplement all GPU brushes

* Support per-draw blend mode and alpha in WebGPU

* Extract DeviceSharedState to WebGPURuntime

* Add inline layer support to compositing pipeline

* Refactor brush renderers and FlushScene parallel loop

* Refactor WebGPU encoder and linearize path model

* Cleanup and document

* Treat TargetFramework as local in csproj

* Pass layer bounds and refactor rasterizer spans

* Buffer contiguous spans to batch row callbacks

* Apply DestinationOffset for path point translation

* Add aliased fine-pass threshold shader and plumbing

* Move WGSL sources to Shaders/WgslSource

* Add 3rd part notices

* Add WebGPU scene support & optimize encoding

* Add docs and helpers for WebGPU shaders & backend

* Add sample; add WebGPU chunking.

* Use CI solution in scripts; tweak sample csproj

* Update refs

* Update WgslSourceGenerator.cs

* Add tolerance

* Update ci-test.ps1

* Update docs.

* add Skia "benchmark backend" options to DrawingBackendBenchmark

* tmp - progress capture only

* Improve GPU perf

* Fix chunking

* cleanup

* Cache and reuse scheduling arena across flushes

* Add reusable WebGPU scene resource arena

* Refactor scheduling & resource arena helpers

* Remove debug logging

* Add slowpath transform

* Apply transforms

* Fix gradient brushes

* Fix GPU stroking and ImageBrush

* Fix GPU brush transforms

* Test pass.

* Implement retained stroke rasterization and stroke commands

* Clean up public API

* Centralize WebGPU probes into WebGPURuntime

* Patch test, update docs

* Honor MaxDegreeOfParallelism in flush

* Add Fill symmetry, new Pie polygon, and migrate to extensions

* Simplify tests and update docs

* detangle build version numbers

* Add PathBuilder shape helpers; normalize angles to degrees

* Fix tests

* Add ParallelExecutionHelper for partitioning

* Update refs

* Update ImageSharp ref

* Cleanup API and fix demo FPS display

* Inline explicit layers; remove compose pass, fix issues

* Include square line cap in bounds; update WebGPU tests

* Improve coverage a little

* Add emoji grid text rendering test and bump Fonts

* Fix parallel bounds, use configuration

* Replace Lease-based runtime with shared API

* Remove HybridCanvasFrame and hybrid APIs

* Replace TryReadback API with Readback methods, remove Shutdown

* benchmark parallel efficiency and overhead

* Introduce safe WebGPU handle wrappers

* Use WebGPUEnvironmentError for probe results

* Use error codes in test attributes.

* Make ToLinearGeometry() cache threadsafe.

* Merge -> Concat

* Use inline array, fix GPU retry counter logic

* Update src/ImageSharp.Drawing/Processing/Backends/DefaultDrawingBackend.cs

Co-authored-by: Anton Firszov <antonfir@gmail.com>

* Update src/ImageSharp.Drawing/Processing/Backends/ParallelExecutionHelper.cs

Co-authored-by: Anton Firszov <antonfir@gmail.com>

* Update ParallelExecutionHelper.cs

* ProcessWithCanvas -> Paint

* Process -> Apply

* Add useful scripts.

* restructure solutions and fix DrawShapesWithImageSharp sample

* make the lines benchmark resizable

* Refactor WebGPU handles and render targets

* Use safe handle refs for WebGPU native calls via using

* Use DrawingOptions in composition and stroke commands

* Fix tests

* Update WebGPU docs.

* Align chunk tile heights to 16-row bins

* Add more efficient path-row shaders and sparse tile handling

* Fix benchmark resize handling

* Add hosted window API and samples  + fix bugs/perf

* Remove overly defensive guards

* Make CloneForClearOperation internal

* Use IEnumerable for DrawGlyphs

* Unify text measurement API to TextMetrics

* Remove InnerJoin config, ensure WebGPU configuration coverage

* Remove WebGPUTextureTransfer and use Readback APIs

* Remove partial modifier from DrawingCanvas

* Rename DrawingCanvasExtensions class

* Full cleanup pass

* Use WebGPUHostedSurface and normalize API

* Treat DeviceLost a non-fatal until it is.

* Refactor WebGPU resource allocation to throw

* Replace TryReadRegion with ReadRegion (throws)

* Add Apply readback scene and UI wiring

* Make NativeSurface abstract, simplify, and add WebGPU surface

* Make types internal

* Add WebGPU path-gradient support and remove fallback behavior

* Move canvas convenience APIs to extensions

* Normalize stroke docs.

* Update TextBuilderTests.cs

* Update PathTests.cs

* More Path extensions tests

* Add FillPath_UncontainedGeometry WebGPU test

* Handle point strokes in WebGPU encoder

* Use Allocator/IMemoryOwner instead of ArrayPool

* Use WebGPUNativeTarget and refactor native surface

* Rename HostedSurface to ExternalSurface

* Remove FramebufferSize from WebGPUSurfaceFrame

* Remove Present method; auto-present on Dispose

* Make presentMode readonly; remove properties

* Introduce DrawingCanvas base type and APIs

* Introduce FlattenedPointBuilder and rendering optimizations

* Add rich drawing samples and assets. Fix SaveLayer clipping

* Clean up images that shouldn't be there.

* Tweak sample

* Add files to LFS

* Dispose Canvas then ensure surface handle release

* Make DrawingCanvas factory internal and update tests

* ImageSharp.Drawing.All

* simplify CompositePixelRegistration storage and related lookup methods

* fix xmldoc leftover

* delete unused code

* Add retained drawing scenes and refactor WebGPU

* Remove TPixel generics from WebGPU API

* Refactor drawing backend API and WebGPU helpers

* Add partitioned parallel encoding for WebGPU scenes

* Add WebGPU uncaptured-error handling and safety

* Add retain regression tests

* Remove TryGetOrCreateSharedBuffer

* Refactor WebGPU buffer creation helpers to remove Try

* delete unused code

* delete more dead code

* Rename Graphics to DeviceContext and make field

* Remove WebGPUNativeSurfaceFactory

* Add ReadbackImage API and Buffer2DRegion usage

* Migrate Create to WebGPUNativeSurface

* Use native frames for WebGPU staging and flush

* Fix binning regression.

* Align GPU ImageBrush with CPU

* Convert shape extensions to DrawingCanvas methods

* Use explicit native mappings instead of casts

* Refactor WebGPU native surface and chunking

* Add WebGPU environment options and preference

* Update tolerances

* Trim test output name length

* Make diagnostics internal; drop int encodings, cleanup

* Update tests/ImageSharp.Drawing.Tests/Processing/Backends/WebGPUDrawingBackendTests.cs

Co-authored-by: Anton Firszov <antonfir@gmail.com>

* Remove unused docs

* Update to latest Fonts and add APIs, tests and samples

* Update the sample to allow general closed paths

* Optimize scenes, tweak docs.

* Support continuous and on-demand rendering in samples

---------

Co-authored-by: antonfirsov <antonfir@gmail.com>

Author: JimBobSquarePants

.github/workflows/build-and-test.yml

@@ -92,12 +92,12 @@ jobs:
             framework: net8.0
             sdk: 8.0.x
             runtime: -x64
-            codecov: true
+            codecov: false
           - os: macos-26
             framework: net8.0
             sdk: 8.0.x
             runtime: -x64
-            codecov: false
+            codecov: true
           - os: windows-latest
             framework: net8.0
             sdk: 8.0.x

.gitignore

@@ -227,4 +227,7 @@ artifacts/
 
 /tests/CodeCoverage/OpenCover.*
 SixLabors.Shapes.Coverage.xml
-/tests/SixLabors.Shapes.Benchmarks/BenchmarkDotNet.Artifacts/results/
+/tests/SixLabors.Shapes.Benchmarks/BenchmarkDotNet.Artifacts/results/
+.dotnet
+.codex-*
+.claude

ImageSharp.Drawing.All.sln

@@ -17,6 +17,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "_root", "_root", "{C317F1B1
 		Directory.Build.targets = Directory.Build.targets
 		LICENSE = LICENSE
 		README.md = README.md
+		THIRD-PARTY-NOTICES = THIRD-PARTY-NOTICES
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".github", ".github", "{1799C43E-5C54-4A8F-8D64-B1475241DB0D}"
@@ -323,42 +324,129 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ImageSharp.Drawing.Benchmar
 EndProject
 Project("{D954291E-2A0B-460D-934E-DC6B0785DB48}") = "SharedInfrastructure", "shared-infrastructure\src\SharedInfrastructure\SharedInfrastructure.shproj", "{68A8CC40-6AED-4E96-B524-31B1158FDEEA}"
 EndProject
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-	ProjectSection(SolutionItems) = preProject
-		samples\Directory.Build.props = samples\Directory.Build.props
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-	EndProjectSection
-EndProject
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-EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "workflows", "workflows", "{23859314-5693-4E6C-BE5C-80A433439D2A}"
 	ProjectSection(SolutionItems) = preProject
 		.github\workflows\build-and-test.yml = .github\workflows\build-and-test.yml
 	EndProjectSection
 EndProject
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+EndProject
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+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ImageSharp.Drawing.ManualBenchmarks", "tests\ImageSharp.Drawing.ManualBenchmarks\ImageSharp.Drawing.ManualBenchmarks.csproj", "{70193989-E587-451A-AF34-4C74FEE5DA5A}"
+EndProject
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+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WebGPUWindowDemo", "samples\WebGPUWindowDemo\WebGPUWindowDemo.csproj", "{999D90DE-6940-4693-9F80-701F2D5DB77A}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DrawShapesWithImageSharp", "samples\DrawShapesWithImageSharp\DrawShapesWithImageSharp.csproj", "{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
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+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
 	EndGlobalSection
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+		{999D90DE-6940-4693-9F80-701F2D5DB77A}.Release|x86.Build.0 = Release|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Debug|x64.Build.0 = Debug|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Debug|x86.Build.0 = Debug|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Release|Any CPU.Build.0 = Release|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Release|x64.ActiveCfg = Release|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Release|x64.Build.0 = Release|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Release|x86.ActiveCfg = Release|Any CPU
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -384,13 +472,18 @@ Global
 		{EA3000E9-2A91-4EC4-8A68-E566DEBDC4F6} = {56801022-D71A-4FBE-BC5B-CBA08E2284EC}
 		{59804113-1DD4-4F80-8D06-35FF71652508} = {56801022-D71A-4FBE-BC5B-CBA08E2284EC}
 		{68A8CC40-6AED-4E96-B524-31B1158FDEEA} = {815C0625-CD3D-440F-9F80-2D83856AB7AE}
-		{5493F024-0A3F-420C-AC2D-05B77A36025B} = {528610AC-7C0C-46E8-9A2D-D46FD92FEE29}
 		{23859314-5693-4E6C-BE5C-80A433439D2A} = {1799C43E-5C54-4A8F-8D64-B1475241DB0D}
+		{061582C2-658F-40AE-A978-7D74A4EB2C0A} = {815C0625-CD3D-440F-9F80-2D83856AB7AE}
+		{C7606104-5D58-4670-912C-3F336606B02D} = {815C0625-CD3D-440F-9F80-2D83856AB7AE}
+		{70193989-E587-451A-AF34-4C74FEE5DA5A} = {56801022-D71A-4FBE-BC5B-CBA08E2284EC}
+		{999D90DE-6940-4693-9F80-701F2D5DB77A} = {CC2DDE4D-58D9-4333-BBEE-B4F36E0A4070}
+		{43A3CA46-2675-4AD4-88FC-DDC2E657F0B7} = {CC2DDE4D-58D9-4333-BBEE-B4F36E0A4070}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {5F8B9D1F-CD8B-4CC5-8216-D531E25BD795}
 	EndGlobalSection
 	GlobalSection(SharedMSBuildProjectFiles) = preSolution
+		shared-infrastructure\src\SharedInfrastructure\SharedInfrastructure.projitems*{061582c2-658f-40ae-a978-7d74a4eb2c0a}*SharedItemsImports = 5
 		shared-infrastructure\src\SharedInfrastructure\SharedInfrastructure.projitems*{2e33181e-6e28-4662-a801-e2e7dc206029}*SharedItemsImports = 5
 		shared-infrastructure\src\SharedInfrastructure\SharedInfrastructure.projitems*{68a8cc40-6aed-4e96-b524-31b1158fdeea}*SharedItemsImports = 13
 	EndGlobalSection

ImageSharp.Drawing.sln

@@ -11,15 +11,21 @@ SixLabors.ImageSharp.Drawing
 [![Build Status](https://img.shields.io/github/actions/workflow/status/SixLabors/ImageSharp.Drawing/build-and-test.yml?branch=main)](https://github.com/SixLabors/ImageSharp.Drawing/actions)
 [![Code coverage](https://codecov.io/gh/SixLabors/ImageSharp.Drawing/branch/main/graph/badge.svg)](https://codecov.io/gh/SixLabors/ImageSharp.Drawing)
 [![License: Six Labors Split](https://img.shields.io/badge/license-Six%20Labors%20Split-%23e30183)](https://github.com/SixLabors/ImageSharp.Drawing/blob/main/LICENSE)
-[![Twitter](https://img.shields.io/twitter/url/http/shields.io.svg?style=flat&logo=twitter)](https://twitter.com/intent/tweet?hashtags=imagesharp,dotnet,oss&text=ImageSharp.+A+new+cross-platform+2D+graphics+API+in+C%23&url=https%3a%2f%2fgithub.com%2fSixLabors%2fImageSharp&via=sixlabors)
 
 </div>
 
-### **ImageSharp.Drawing** provides extensions to ImageSharp containing powerful, cross-platform 2D polygon manipulation and drawing APIs.
+**ImageSharp.Drawing** is a cross-platform 2D drawing library built on top of [ImageSharp](https://github.com/SixLabors/ImageSharp). It provides path construction, polygon manipulation, fills, strokes, gradient brushes, pattern brushes, and text rendering. Built against [.NET 8](https://docs.microsoft.com/en-us/dotnet/standard/net-standard).
 
-Designed to democratize image processing, ImageSharp.Drawing brings you an incredibly powerful yet beautifully simple API.
+## Quick Start
 
-Built against [.NET 6](https://docs.microsoft.com/en-us/dotnet/standard/net-standard), ImageSharp.Drawing can be used in device, cloud, and embedded/IoT scenarios. 
+```csharp
+image.Mutate(ctx => ctx.Paint(canvas =>
+{
+    canvas.Fill(Brushes.Solid(Color.White));
+    canvas.Fill(Brushes.Solid(Color.Red), new EllipsePolygon(200, 200, 100));
+    canvas.Draw(Pens.Solid(Color.Blue, 3F), new RectangularPolygon(50, 50, 200, 100));
+}));
+```
 
 ## License
 
@@ -61,12 +67,12 @@ If you prefer, you can compile ImageSharp.Drawing yourself (please do and help!)
 
 - Using [Visual Studio 2022](https://visualstudio.microsoft.com/vs/)
   - Make sure you have the latest version installed
-  - Make sure you have [the .NET 7 SDK](https://www.microsoft.com/net/core#windows) installed
+  - Make sure you have [the .NET 8 SDK](https://www.microsoft.com/net/core#windows) installed
 
 Alternatively, you can work from command line and/or with a lightweight editor on **both Linux/Unix and Windows**:
 
 - [Visual Studio Code](https://code.visualstudio.com/) with [C# Extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode.csharp)
-- [the .NET 7 SDK](https://www.microsoft.com/net/core#linuxubuntu)
+- [the .NET 8 SDK](https://www.microsoft.com/net/core#linuxubuntu)
 
 To clone ImageSharp.Drawing locally, click the "Clone in [YOUR_OS]" button above or run the following git commands:
 

README.md

@@ -0,0 +1,40 @@
+SixLabors.ImageSharp.Drawing uses or incorporates ideas, algorithms, and/or
+implementation guidance from third-party projects that are distributed under
+licenses different from the Six Labors ImageSharp.Drawing software.
+
+The attached notices are provided for informational purposes only. Please
+review the original project repositories and license files for complete terms.
+
+================================================================================
+
+Blaze (https://github.com/aurimasg/blaze)
+License: MIT
+
+Portions of this software were developed with reference to the Blaze
+project, including rasterization and related implementation techniques.
+See also: src/ImageSharp.Drawing/Processing/Backends/DEFAULT_RASTERIZER.MD
+
+Copyright (c) 2023 Aurimas Gasiulis
+
+The Blaze project is distributed under the MIT License. The full license text
+is available in the Blaze repository LICENSE file.
+
+================================================================================
+
+Vello (https://github.com/linebender/vello)
+License: Apache-2.0 OR MIT
+
+Portions of this software were developed with reference to the Vello project,
+including GPU rasterization pipeline structure, shader stages, and related
+implementation techniques.
+See also:
+  - src/ImageSharp.Drawing.WebGPU/WEBGPU_BACKEND.md
+  - src/ImageSharp.Drawing.WebGPU/WEBGPU_RASTERIZER.md
+
+Copyright 2020 the Vello Authors
+
+The Vello project is distributed under the Apache License, Version 2.0, or the
+MIT License. The full license texts are available in the Vello repository
+LICENSE-APACHE and LICENSE-MIT files.
+
+================================================================================