Arduino TJpg_Decoder library
===========
This Arduino library supports the rendering of Jpeg files stored both on SD card and in arrays within program memory (FLASH) onto a TFT display. In addition images stored in the SPIFFS Flash filing system or "PROGMEM" arrays can be used with the ESP8266 and ESP32 processors.
The library works on the Arduino Due, ESP32 and ESP8266 (e.g. NodeMCU 1.0).
Jpeg files in the "Progressive" format (where image data is compressed in multiple passes with progressively higher detail) are not supported since this would require much more memory, or too many Inverse Discrete Cosine Transform's for typical embedded systems.
When storing the jpeg in a memory array bear in mind that some Arduino boards have a maximum 32767 byte limit for the maximum size of an array (32 KBytes minus 1 byte).
The decompression of Jpeg images needs more RAM than an UNO provides, thus this library is targetted at processors with more RAM. The library has been tested with ESP8266/ESP32 based boards.
On a Mega the number of images stored in FLASH must be limited because it they are large enough to push the executable code start over the 64K 16 bit address limit then the Mega will fail to boot even though the sketch compiles and uploads correctly. This is a limitation imposed by the Arduino environment not this library! The Arduino Mega is not recommended as it does not reliably decode some jpeg images possibly due to a shortage of RAM. The Due will work fine with much bigger image sets in FLASH.
This library uses the TJpgDec decompressor engine detailed here:
http://elm-chan.org/fsw/tjpgd/00index.html
TJpgDec is a generic JPEG image decompressor module that highly optimized for small embedded systems.
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TJpg_Decoder:基于Tiny JPEG Decompressor的Jpeg解码器库
共29个文件
h:8个
ino:7个
jpg:5个
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2021-05-13
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Arduino TJpg_Decoder库 该Arduino库支持将存储在SD卡上以及程序存储器(FLASH)中的阵列中的Jpeg文件呈现到TFT显示器上。 此外,存储在SPIFFS Flash归档系统或“ PROGMEM”阵列中的图像可以与ESP8266和ESP32处理器一起使用。 该库适用于Arduino Due,ESP32和ESP8266(例如NodeMCU 1.0)。 不支持“渐进式”格式的Jpeg文件(其中,图像数据经过多次压缩以越来越高的细节进行压缩),因为这将需要更多的内存,或者对于典型的嵌入式系统而言,它需要太多的反离散余弦变换。 将jpeg存储在内存阵列中时,请记住,某些Arduino主板的最大阵列大小(32 KB减1字节)具有最大32767字节的限制。 Jpeg图像的解压缩需要比UNO提供的更多的RAM,因此,该库的目标对象是具有更多RAM的处理器。 该库已通过
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TJpg_Decoder-master.zip (29个子文件)
TJpg_Decoder-master
.gitignore 315B
license.txt 3KB
README.md 2KB
library.properties 250B
examples
SPIFFS_Jpg
data
panda.jpg 12KB
SPIFFS_Jpg.ino 3KB
Flash_Jpg_GFX
panda.h 76KB
Flash_Jpg_GFX.ino 2KB
All_SPIFFS
Data
tiger.jpg 46KB
Baboon40.jpg 24KB
panda.jpg 12KB
All_SPIFFS.ino 5KB
Web_Jpg
Web_Fetch.h 2KB
List_SPIFFS.h 3KB
Web_Jpg.ino 3KB
Flash_Jpg
Flash_Jpg.ino 2KB
panda.h 76KB
ESP32_Dual_Core_Flash_Jpg
ESP32_Dual_Core_Flash_Jpg.ino 5KB
panda.h 76KB
SD_Jpg
SD_Jpg.ino 3KB
data
panda.jpg 12KB
.gitattributes 378B
library.json 457B
src
TJpg_Decoder.cpp 18KB
tjpgd.c 74KB
TJpg_Decoder.h 3KB
User_Config.h 417B
tjpgd.h 4KB
keywords.txt 569B
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