Functional Specification: Browser-Based Meme Creator

Overview

This application is a client-side web tool that enables users to upload images and generate custom memes by adding, styling, and positioning text layers via drag-and-drop functionality.

Technical Requirements

• Client-Side Rendering: Must be built using the HTML5 Canvas API to allow real-time image manipulation.
• State Management: The application must track multiple text layers (Z-index, X/Y coordinates, font-family, font-size, color, text-stroke, and content).
• Export: Ability to generate high-resolution PNG or JPEG files directly from the canvas state.
• Responsive UI: Must support both desktop mouse input and mobile touch events for dragging and resizing.

Core Features

1. Image Import:
   • Support for local file selection (drag and drop or click to upload).
   • Image scaling to fit the workspace while maintaining aspect ratio.
2. Dynamic Text Layers:
   • Add/Remove text fields dynamically.
   • Interactive drag-and-drop repositioning.
   • Real-time text editing within the viewport.
   • Text layering (bring to front/send to back).
3. Customization Toolbar:
   • Font selection (pre-loaded list of common meme-style fonts like Impact, Arial, and Sans-serif).
   • Color picker for text color and text outline color.
   • Font size slider and Uppercase/Lowercase toggle.
   • Text alignment (Left, Center, Right).
4. Export Utility:
   • One-click "Download Meme" button.
   • Option to choose file format and quality settings.

User Interface (UI) Design

• Layout: Split-screen design. A left-hand configuration sidebar containing all tool options and a right-hand primary stage showing the live preview.
• Theme: Dark mode interface with a light gray canvas background. This contrast ensures that the meme being edited is the primary focal point of the screen.
• Animations:
  • Smooth transitions for opening and closing settings panels.
  • Hover states for draggable elements (e.g., changing cursor to 'grab' on hover).
  • Subtle fade-in effects when adding new text layers.

Security & Performance

• Zero-Server Processing: All editing is performed in the user's browser memory (Client-side). No image data is sent to a backend server.
• Efficiency: Use of requestAnimationFrame for smooth text rendering and dragging performance, even on lower-end devices.