olikraus/u8g2
U8g2
u8g2 is a monochrome display driver library written in C and C++ for rendering graphics and text on OLED and LCD screens. It functions as an embedded graphics library and font renderer, providing a hardware abstraction layer to manage communication with display controllers.
The library is distinguished by its flexible memory management, offering both full-screen memory mapping for arbitrary drawing and page-based frame buffering to reduce RAM consumption. It further optimizes resource usage through direct-to-display text rendering, which bypasses intermediate memory buffers.
The framework covers monochrome geometric drawing for lines, boxes, and circles, alongside a font system that supports custom sizes and pre-rendered monochrome font-maps. Hardware integration is handled via support for SPI, I2C, and parallel interfaces, with additional capabilities for image mirroring and rotation in ninety-degree increments.
The library includes build support for the RT-Thread real-time operating system.
Features
- Embedded Graphics Libraries - Provides a software library designed to manage and render visual displays on small, resource-constrained embedded screens.
- OLED Display Drivers - Provides drivers for monochrome OLED and LCD display modules.
- Pixel-Buffer Memory Mapping - Allocates a complete pixel array in RAM to allow arbitrary drawing before pushing the final image to hardware.
- Monochrome Icon Rendering - Draws text by mapping characters to pre-defined monochrome bitmasks optimized for single-color pixel grids.
- Monochrome Geometric Drawing - Renders lines, boxes, and circles using a memory buffer to manage complex imagery on screens.
- Display Communication Interfaces - Provides a hardware abstraction layer to manage communication with controllers via SPI, I2C, and parallel interfaces.
- SPI I2C One-Wire Serial Activators - Implements SPI, I2C, and parallel interfaces to communicate with external monochrome display controllers.
- Monochrome Controller Driving - Manages screen output by communicating with various monochrome OLED and LCD hardware controllers.
- Monochrome Display Drivers - Implements hardware-specific drivers for rendering text and graphics on monochrome OLED and LCD displays.
- Unified Hardware Communication Interfaces - Provides a unified software bridge that abstracts SPI, I2C, and parallel protocols into a single interface for displays.
- Hardware Abstraction Layers - Provides a consistent API for interacting with diverse monochrome display controllers via a hardware abstraction layer.
- Low Memory Display Interfacing - Outputs text and graphics to a screen using page-based buffering or direct writing to save system RAM.
- Page-Based Frame Buffering - Renders images in horizontal strips to minimize the amount of RAM needed for the display buffer.
- Font Management - Provides utilities for embedding and loading custom monochrome typography into embedded application binaries.
- Font Renderers - Implements a library for converting font data into displayable bitmaps for monochrome screens.
- Display Buffer Managers - Manages frame buffer memory allocation using full-screen or page-based approaches to optimize RAM usage.
- Degree-Based Rotators - Supports changing display orientation through 90-degree increments and image mirroring.
- Image Rotation - Implements image rotation and mirroring by transforming pixel coordinates during the buffering process.
- Direct-to-Display Renderers - Writes character data straight to the hardware controller without using an intermediate memory buffer to save RAM.
- Custom Font Libraries - Supports the use of custom font sizes and heights optimized for monochrome screens.
- Bitmap Font Rendering - Provides a system for rendering text by mapping characters to monochrome bitmap atlases.
- Graphical User Interfaces - Monochrome graphics library for embedded displays.
- Graphics and UI - Graphics library for monochrome displays.
Star history
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