Platform support

What each official viewer and SDK does with a .oim file today. All of them pass the conformance vectors in @oim-media/spec, so a feature marked ✅ renders or behaves the same everywhere. A feature marked ❌ is skipped: the file still opens and the rest of it renders.

Feature	Web <oim-player>	Desktop viewer	Flutter oim_flutter	Rust oim
Read the file (tEXt/zTXt chunk)	✅	✅	✅	✅
Signature verification (ECDSA P-256)	✅	✅	✅	✅
Image seal (altered file refused)	✅	✅	✅	✅
Re-edit permission	✅	✅	✅	✅
Text in several languages	✅	✅	✅	text only
Language selector	✅	✅	✅ (language + oimLanguages)	—
Shapes, SVG paths and geo drawings	✅	✅	✅	—
Image layers (crop, fit, flip)	✅	✅	✅	—
Text style (weight, spacing, line height, case)	✅	✅	✅	—
Text runs and marks	✅	✅	✅ (highlights as a plain background)	—
Embedded fonts	✅	✅	✅ (WOFF; WOFF2 from before 1.27.0 paints the platform font)	—
Named palettes and colour roles	✅	✅	✅	—
Dynamic colours (dark mode)	✅	✅	✅	—
Shadow, blur and blend mode	✅	✅	✅	—
Media filters	✅	✅	✅	—
Gradient fills	✅	✅	✅	—
Pattern layers	✅	✅	✅	—
Grain	✅	✅	✅	—
Masks	✅	✅	✅	—
Parallax and scene loop	✅	✅	✅	—
Keyframe animation	✅	✅	✅	—
Loop and hover presets	✅	✅	✅ (not glow)	—
Text animations and entrances	✅	✅	✅	—
Actions and states (click, hover, reveal, play)	✅	✅	✅	—
Lottie layers	✅	✅	✅ (allowLottie)	—

• Web <oim-player> is the reference implementation, from cdn.oim.media or the npm package @oim-media/player-oim.
• Desktop viewer (Windows, macOS, Linux) wraps the web player, so it supports the same features.
• Flutter oim_flutter renders natively on Android, iOS, desktop and web. It is installed from git until it reaches pub.dev.
• Rust oim reads, verifies and resolves text. It does not render; use it on servers and in pipelines.

Videos (.ovm) play only in the web <ovm-player>.