Landscape images do not display correctly with function drawJpgFile()

[geprc]

ESP32 dev module with ST7789 display connected to hardware SPI.

When trying to display a SPIFFS jpg image which is 135x135 landscape orientation the image displays smaller with a block of background colour filling the rest of the screen.

I've modified the example sketch like this:

void loop() {
       tft.fillScreen(random(0xFFFF));
       tft.setRotation(1);
       fex.drawJpgFile(SPIFFS, "/image.jpg", 0, 0);
}

Just like this:

[Bodmer]

It looks your screen has an offset of sbout 40 pixels. A quick fix is to add this offset in your sketch. Instead of 0,0 cordinates, try 40,40

[geprc]

40， 40 will be this and 40， 70 will be this

[geprc]

and if i use function drawBmp(), it will be ok,it seems that function drawJpgFile() is not adaptation with st7789,or pixel 240*135

[Bodmer]

I have marked this as a bug. Thanks for raising the issue. The display you are using has some offsets so it appears that these are not being used when rendering a jpeg file.

You could try this new jpeg library.

I am not in a position to investigate the bug at the moment but will have a look in a few days time.

[Bodmer]

I have tested it with the new Tjpg_Decoder library here and this example works: SPIFFS_Jpg_T1.zip

Using the Tjpg_Decoder library is therefore an option for you until I can track down the bug.

[Bodmer]

I think I will be stripping out the ESP32 related jpeg code as it has a rather awkward API, and update the examples to use the TJpg_Decoder library, that library also uses a more up-to-date version of the decoder engine.