drawJPG does not work

[daverathbone]

Environment ( 実行環境 )

• MCU or Board name: [ESP-WROOM-32r]
• Panel Driver IC: [ILI9488]
• Bus type: [SPI]
• LovyanGFX version: [latest develop]
• FrameWork version: |ESP-IDF v5.0]
• Build Environment: [Visual Studio Code IDE]
• Operating System: [ ESP32 IDF / FREERTOS Via Windows 11]

Problem Description ( 問題の内容 )

My code works for BMP and PNG but Not JPG

Expected Behavior ( 期待される動作 )

Should take buffer of JPEG file and convert to image Q) Is the JPEG decoder built in to your code?

Actual Behavior ( 実際の動作 )

No error but blank on for JPG screen others text is displayed

Steps to reproduce ( 再現のための前提条件 )

step 1

  lcd.drawBmp(buffer, fileSize, x, y,0, 0, 0, 0, scalex, scaley);   //  works

Step 2

  lcd.drawPng(buffer, fileSize, x, y,0, 0, 0, 0, scalex, scaley);   // works

Step 3

  lcd.drawJpg(buffer, fileSize, x, y,0, 0, 0, 0, scalex, scaley);  // Does not work

// If possible, attach a picture of your setup/wiring here. The display has text as well that works but no image if jpg

// main text underlogo
lcd.setCursor(0, 128);
lcd.setTextColor(TFT_GREEN);    
lcd.setFont( &fonts::FreeMonoBold9pt7b);
lcd.println("Select settings with OK button (Not Fitted)");
lcd.println("");

Code to reproduce this issue ( 再現させるためのコード )

// place JPG image from file at x,y and adjust scale
void displayJPG(const char *filename, int32_t x, int32_t y, float scalex , float scaley) {

        FILE *file = fopen(filename, "r");
        if (!file) {
            ESP_LOGE(TAG, "Failed to open file for reading");
            return;
        }

        fseek(file, 0, SEEK_END);
        long fileSize = ftell(file);
        fseek(file, 0, SEEK_SET);

        uint8_t *buffer = (uint8_t *)malloc(fileSize);
        if (!buffer) {
            ESP_LOGE(TAG, "Failed to allocate memory for file content");
            fclose(file);
            return;
        }

        size_t bytesRead = fread(buffer, 1, fileSize, file);
        if (bytesRead != fileSize) {
            ESP_LOGE(TAG, "Failed to read the file into buffer");
            free(buffer);
            fclose(file);
            return;
        }

        fclose(file);

        lcd.startWrite(); 
        lcd.drawJpg(buffer, fileSize, x, y,0, 0, 0, 0, scalex, scaley);
        lcd.endWrite();  

        free(buffer);
    }

Please submit complete source code that can reproduce your problem. あなたの問題を再現できる完全なソースコードを提示してください。 Program is to large but you have the code

[lovyan03]

Progressive JPEG is not supported. Please check the JPEG data specifications.

[daverathbone]

What JPEG data specification is used if not Progressive JPEG ?

[lovyan03]

I don't know the details, but drawJpg is working for me.

[daverathbone]

My jpg is just from Windows Paint.net. how have you made your JPG's?

[lovyan03]

find out for yourself

[daverathbone]

LovyanGFX JPEG decoder uses "baseline" not Progressive format (As per your reply) Progressive is the normal JPG used in 89% of most applications today. This fiixes the conveertion.. (Although you may as well just use png!)

I downloaded IRFANVIEW GRAPHIC VIEWER from https://www.irfanview.com/ its free. Read in your JPEG file and save it its converted then to baseline. then its displyed!

[lovyan03]

Progressive is the normal JPG used in 89% of most applications today.

It is difficult to support progressive JPG with a microcontroller with little memory. Try it yourself.