ShockwaveFlash.Rendering 1.6.0

ShockwaveFlash.Rendering

Render SWF characters — shapes, sprites, timelines, morph shapes, text and images — parsed by ShockwaveFlash to SVG and to raster images (PNG / JPEG / WebP / animated GIF / PDF) through a native, cross-platform Skia backend. No external tools — no Inkscape, rsvg or ImageMagick.

Install

dotnet add package ShockwaveFlash.Rendering

On headless Linux, also add SkiaSharp.NativeAssets.Linux.NoDependencies.

Render to an image

using ShockwaveFlash;
using ShockwaveFlash.Rendering;
using ShockwaveFlash.Rendering.Drawing.Skia;

var swf = ShockwaveFlashFile.Disassemble(File.ReadAllBytes("movie.swf"));
var renderer = new SwfRenderer(swf);

// the whole movie, scaled 2x...
byte[] png = SkiaDrawer.RenderToPng(renderer.Movie(), scale: 2f);
File.WriteAllBytes("movie.png", png);

// ...or a single character by id
byte[] jpeg = SkiaDrawer.RenderToJpeg(renderer.Character(42), quality: 90);

SkiaDrawer also exposes RenderToWebp, RenderToPdf and RenderToAnimatedGif (which walks every frame of the timeline).

Render to SVG

using ShockwaveFlash.Rendering.Drawing.Svg;

string svg = SvgDrawer.RenderToSvg(renderer.Movie());
File.WriteAllText("movie.svg", svg);

Design

A clean layering, inspired by Arakne-Swf but with rasterization pulled in-process via Skia:

ShockwaveFlash                parser / writer
   └─ ShockwaveFlash.Rendering
        ├─ Model/       immutable drawable data (shapes, images, morphs, …)
        ├─ Processing/  tags → model (ShapeProcessor, TimelineProcessor, …)
        ├─ Scene/       display list (frames, blend modes)
        └─ Drawing/     IDrawer visitor + Skia & SVG backends

• Skia is the native rasterizer — exact gradients, blend modes, filters and anti-aliasing, cross-platform, no shelling out.
• IDrawer is a streaming visitor — a drawable pushes primitives; a backend turns them into pixels or SVG. One model, multiple outputs.
• Immutable model over ReadOnlyMemory<byte>; coordinates stay in twips until the backend converts to pixels.
• Tunable error policy via RenderOptions — Strict to fail fast, or an IDiagnosticSink to collect and keep going.

Notes

• Coverage — shapes, sprites, timelines, morph shapes, buttons, static and edit text, and bitmaps (JPEG and lossless). Gradients, line/fill styles, colour transforms, blend modes, clip masks and filters are honoured.
• Status — newer and less battle-tested than the parser; the rendering surface may still evolve.

Part of the ShockwaveFlash project · MIT © Aerafal