Crate tjpgdec_rs 

TJpgDec-rs - Tiny JPEG Decompressor

A lightweight JPEG decoder optimized for embedded systems.

Based on TJpgDec R0.03 (C)ChaN, 2021

Key Features

• Memory pool allocation - Predictable memory usage
• Small decoder struct - Only ~120 bytes
• no_std compatible - Works in embedded environments
• Three optimization levels - Balance speed vs memory (fast-decode-0/1/2)
• No heap allocation - All memory from user-provided pool

Example Usage

use tjpgdec_rs::{JpegDecoder, MemoryPool, RECOMMENDED_POOL_SIZE, Result};
 
fn decode_jpeg(jpeg_data: &[u8]) -> Result<()> {
    // Allocate memory pool
    let mut pool_buffer = vec![0u8; RECOMMENDED_POOL_SIZE];
    let mut pool = MemoryPool::new(&mut pool_buffer);
     
    // Create decoder
    let mut decoder = JpegDecoder::new();
     
    // Prepare decoder
    decoder.prepare(jpeg_data, &mut pool)?;
     
    // Get image info
    let width = decoder.width();
    let height = decoder.height();
     
    // Decode image...
    Ok(())
}

Structs

BitStream

Bit stream reader

HuffmanTable

Huffman coding table

JpegDecoder

JPEG decoder

MemoryPool

Memory pool for workspace allocation

Rectangle

Rectangular region in the output image

Enums

Error

Error codes for JPEG decompression

OutputFormat

Output pixel format

Constants

BUFFER_SIZE

Size of stream input buffer

MINIMUM_POOL_SIZE

Minimum workspace size

MIN_WORKSPACE_SIZE

RECOMMENDED_POOL_SIZE

Recommended workspace size

Functions

calculate_pool_size

Calculate required workspace memory pool size

fastdecode_level

Query the current optimization level

Type Aliases

OutputCallback

Output callback function

Result

Result type for JPEG operations