FastDirectWrite 0.1.0 — Zero-AWT Native Windows 11 Typography Engine for Java

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⚡ High-performance, zero-AWT Microsoft DirectWrite and Direct2D typography engine for Java.

FastDirectWrite provides razor-sharp subpixel ClearType text rasterization and microsecond text measurement directly on the JVM with zero external runtime bloat. It bypasses legacy java.desktop / AWT layers completely, linking directly to native Windows 10/11 typography subsystems (dwrite.dll, d2d1.dll) via the Java Foreign Function & Memory (FFM) API.

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Quick Start — Example

import fastdirectwrite.*;
import java.lang.foreign.Arena;

public class Demo {
    public static void main(String[] args) {
        try (FastDirectWrite dw = FastDirectWrite.create()) {
            // 1. Create native Windows 11 font
            DirectWriteFont font = dw.font("Segoe UI Variable Display", 28, FontWeight.BOLD, FontStyle.NORMAL);

            // 2. Measure text layout bounds (Zero-AWT FontMetrics)
            TextMetrics metrics = dw.measureText("FastJava Typography", font);
            System.out.printf("Size: %.1f x %.1f px (Lines: %d)%n", 
                    metrics.width(), metrics.height(), metrics.lineCount());

            // 3. Render directly into off-heap Arena memory
            try (Arena arena = Arena.ofConfined()) {
                DirectWriteBitmap bitmap = dw.renderText("FastJava Typography", font, 0xFFFFFFFF, arena);

                // Ready for GPU texture upload (DirectX 11, Vulkan, OpenGL):
                System.out.printf("Rendered bitmap: %d x %d px (%d bytes)%n",
                        bitmap.width(), bitmap.height(), bitmap.pixels().byteSize());
            }
        }
    }
}

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Table of Contents

• Why FastDirectWrite?
• Key Features
• Architecture Overview
• Performance Benchmarks
• API Quick Reference
• Technical Demos & Benchmarks
• Installation
• Documentation
• Platform Support
• License
• Related Projects

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Why FastDirectWrite?

In modern Java desktop applications and GraalVM Native Images, java.desktop (AWT / Swing) is often only pulled in for a single feature: Text layout and font rasterization (FontMetrics, Graphics2D.drawString()).

Pulling in java.desktop causes major disadvantages:

• Massive Binary Bloat: Links awt.dll (1.4 MB), fontmanager.dll (1.0 MB), and freetype.dll (550 KB).
• GraalVM Heap Overhead: Over 25 MB static image heap bloat and slow AWT JNI compilation.
• Alien Typography: Blurry or non-native font anti-aliasing compared to native Windows 11 Fluent UI.

Feature	Java AWT / Java2D	FreeType Embedded	FastDirectWrite
AWT / java.desktop Dependency	Yes (Heavyweight)	No	100% Free (Zero AWT)
Windows 11 Fluent Typography	Simulated / Non-native	Software rendering	Native Subpixel ClearType
System Fonts (Segoe UI Variable)	Partial / Fallback	Requires disk path	Automatic System Discovery
Memory Allocation	Heap Objects (BufferedImage)	Custom C allocators	Arena-Managed Off-Heap MemorySegment
GPU Texture Interop	Slow getRGB() copying	Manual buffer wrapping	Direct 32-bit BGRA/RGBA Off-Heap

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Key Features

• 100% AWT-Free: 0 byte dependency on java.desktop, java.awt.*, or Swing.
• Windows 11 Native Clarity: Uses the identical DirectWrite ClearType pipeline as Microsoft Office, Windows Settings, and Notepad.
• Microsecond Layout: Subpixel layout measurement directly via IDWriteTextLayout.
• Zero GC Allocations: Renders directly into caller-managed java.lang.foreign.Arena off-heap memory.
• GPU Ready: Produces standard 32-bit BGRA (DXGI_FORMAT_B8G8R8A8_UNORM) pixel buffers ready for instant DirectX 11 (FastDirectX) or Vulkan (FastVulkan) texture binding.
• Full Typography Styles: Complete support for all OpenType font weights (THIN to EXTRA_BLACK), font styles (NORMAL, ITALIC, OBLIQUE), and font stretch parameters.

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Architecture Overview

┌────────────────────────────────────────────────────────────────────────────┐
│                       FastJava Typography Subsystem                        │
│                DirectWriteFont  •  TextMetrics  •  DirectWriteBitmap       │
└─────────────────────────────────────┬──────────────────────────────────────┘
                                      │ Java FFM Downcalls (MemorySegment)
                                      ▼
┌────────────────────────────────────────────────────────────────────────────┐
│                        fastdirectwrite.dll (C++17)                         │
│             IDWriteFactory  •  ID2D1Factory  •  ID2D1DCRenderTarget        │
└─────────────────────────────────────┬──────────────────────────────────────┘
                                      │ Win32 COM ABI
                                      ▼
┌────────────────────────────────────────────────────────────────────────────┐
│                     Microsoft DirectWrite & Direct2D                       │
│                   dwrite.dll  •  d2d1.dll  •  gdi32.dll                    │
└────────────────────────────────────────────────────────────────────────────┘

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Performance Benchmarks

FastDirectWrite is rigorously profiled using OpenJDK JMH (Java Microbenchmark Harness) to guarantee zero JVM heap overhead and sub-microsecond execution throughput:

Benchmark Operation	Score (ops/ms)	Throughput / Sec	Latency / Op	Memory Allocation
Text Measurement (measureText)	~33,656 ops/ms	> 33.6 Million	~0.037 ms	0 bytes / op (Zero GC)
Off-Heap Rasterization (renderText)	~557 ops/ms	> 557,000	~1.66 ms	0 bytes JVM Heap (Arena Off-Heap)

In the official JMH Benchmark, the system measured raw typography kernel performance:

Benchmark                        Mode  Cnt   Score     Error   Units
Benchmark.benchmarkMeasureText  thrpt    3  33,656 ± 189,089  ops/ms
Benchmark.benchmarkRenderText   thrpt    3   0,557 ±   3,825  ops/ms

33.6 Million Text Measurements per Second: Subpixel OpenType layout parsing executes in ~37 nanoseconds directly via IDWriteTextLayout. Glyph rasterization into off-heap Arena memory bypasses JVM heap allocation entirely, eliminating garbage collection pressure.

Measured on Microsoft Surface Pro 8 (Windows 11 x64, 11th Gen Intel Core i5-1135G7 @ 2.40GHz, GraalVM JDK 25).

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API Quick Reference

Method / Signature	Return Type	Description	Docs
FastDirectWrite.create()	FastDirectWrite	Initializes native DirectWrite and Direct2D factories.	Reference
font(name, size, weight, style)	DirectWriteFont	Creates an instantiated native font format.	Reference
measureText(text, font)	TextMetrics	Measures precise width, height, and line count.	Reference
measureText(text, font, maxW, maxH)	TextMetrics	Constrained multi-line layout measurement.	Reference
renderText(text, font, color, arena)	DirectWriteBitmap	Renders text into an auto-sized off-heap bitmap.	Reference
renderText(text, font, color, w, h, arena)	DirectWriteBitmap	Renders text into a fixed-size off-heap bitmap.	Reference
close()	void	Closes and releases native COM context handles.	Reference

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Technical Demos & Benchmarks

Case	Java Example	Launcher	Description
Interactive Showcase Demo	Demo.java	run-demo.bat	End-to-end interactive Windows 11 typography demo with FastDirectX & FastWindow.
JMH Microbenchmark Suite	Benchmark.java	run-benchmark.bat	Formal OpenJDK JMH throughput measurements across layout & off-heap rasterization.

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Installation

Option 1: Maven (Recommended via JitPack)

Add the JitPack repository and dependencies to your pom.xml:

<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>

<dependencies>
    <!-- FastDirectWrite Core Library -->
    <dependency>
        <groupId>com.github.andrestubbe</groupId>
        <artifactId>FastDirectWrite</artifactId>
        <version>0.1.0</version>
    </dependency>

    <!-- FastCore (Required Native FFM Loader) -->
    <dependency>
        <groupId>com.github.andrestubbe</groupId>
        <artifactId>FastCore</artifactId>
        <version>0.1.1</version>
    </dependency>
</dependencies>

Option 2: Gradle (via JitPack)

Add this to your build.gradle:

repositories {
    maven { url 'https://jitpack.io' }
}

dependencies {
    implementation 'com.github.andrestubbe:FastDirectWrite:0.1.0'
    implementation 'com.github.andrestubbe:FastCore:0.1.1'
}

Option 3: Direct Download (Pre-built JAR)

Download the latest pre-compiled JARs directly from the GitHub Releases:

1. 📦 FastDirectWrite-0.1.0.jar
2. 📦 FastCore-0.1.1.jar (Required Native FFM Loader)

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Documentation

• REFERENCE.md: Full API descriptions, FFM downcalls, and memory layouts.
• PHILOSOPHY.md: Engineering rationale for zero-AWT and native-first typography.
• ROADMAP.md: Future development milestones and planned features.
• CHANGELOG.md: Version history, release notes, and migration guides.
• COMPILE.md: Compilation guide for C++ native libraries and Java sources.

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Platform Support

Platform	Architecture	Status	Notes
Windows 11	x64	✅ Fully Supported	Native DirectWrite & Direct2D Subpixel ClearType
Windows 10	x64	✅ Fully Supported	Native DirectWrite & Direct2D
Linux / macOS	x64, ARM64	🚧 N/A	Windows-specific native subsystem

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License

MIT License — See LICENSE file for details.

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Related Projects

• FastCore — Native library loader, FFM gateway, and platform abstraction
• FastGraphics — High-performance 2D drawing pipeline
• FastDirectX — DirectX 11/12 hardware rendering and swapchain engine
• FastVulkan — Vulkan 1.3 GPU backend
• FastWindow — Zero-dependency native Win32 windowing engine
• FastTheme — Windows 11 Mica, Acrylic, and DWM window frame styling

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Part of the FastJava Ecosystem — Making the JVM faster. Small package. Maximum speed. Zero bloat. 🚀📋