Converting image to RGB16 in array

Kris Revi

Code

void MainWindow::selectedImageDisplay(QString img)
{
    QImage imageObject;    // Make a new imageObject
    imageObject.load(img); // Load the image from path

    imageObject = imageObject.convertToFormat(QImage::Format_RGB16);

    QJsonArray RGB565;
    for(int y = 0; y < 128; y++)
    {
        const quint16 *line = reinterpret_cast<const quint16*>(imageObject.constScanLine(y));
        for(int x = 0; x < 128; x++)
        {
            RGB565 << *(line++);
        }
    }
    socket.sendCommandStrip(QStringLiteral("pixArt"), RGB565);
}

Question
Is it possible to make this smaller in size?
the reason for this is the ESP32 does not have enough memory for this... when i send this over and use ArduinoJson lib to deserializeJson i end up with error DeserializationError::NoMemory

SGaist

Hi,

How much memory do you have available on that device ?

Kris Revi

@SGaist

Free Heap Size Befor Matrix : 330604
*** ESP32-HUB75-MatrixPanel-I2S-DMA: Memory Allocations Complete ***        
Total memory that was reserved: 132 kB.
... of which was used for the DMA Linked List(s): 4 kB.
Heap Memory Available: 192340 bytes total. Largest free block: 113792 bytes.
General RAM Available: 123968 bytes total. Largest free block: 113792 bytes.
Free Heap Size after Matrix : 192196
[WIFI][STATUS] Connecting to WiFi..
[WIFI][STATUS] Connected
Free Heap Size after Wifi : 135128
Free Heap Size after Socket : 135008

Free Heap Size after Socket : 135008 is what im left with

this does not include DynamicJsonDocument inData(128*128); (and i belive even 128*128 is not even big enough)
and
uint16_t pixelArt[128*128] = { }; i copy the array from json into this and then over to the Matrix Display

SGaist

You might need to send your image in smaller chunks and process these chunks on your device.

Kris Revi

Never done that befor

SGaist

Never done what ?