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Convert RGBA8888 buffer to jpeg buffer in memory

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  • AlienA Offline
    AlienA Offline
    Alien
    wrote on last edited by
    #1

    Hi,
    I've a buffer that contains RGBA888 ,I want to create another buffer that hold the jpeg format according to RGBA buffer with header and data.
    I would appreciate any idea.

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    0
    • ? Offline
      ? Offline
      A Former User
      wrote on last edited by
      #2

      Hi!

          // prepare image in RGBA8888 format
          QImage img(600, 400, QImage::Format_RGBA8888);
          {
              img.fill(QColor("white"));
              QPainter painter(&img);
              painter.drawLine(0, 0, 600, 400);
              painter.drawLine(0, 400, 600, 0);
          }
      
          // save image as JPEG to buffer
          QByteArray ba; // buffer uses ba as its storage
          QBuffer buf(&ba); // we'll use buf as QIODevice
          buf.open(QIODevice::WriteOnly);
          img.save(&buf, "JPEG");
      
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      • AlienA Offline
        AlienA Offline
        Alien
        wrote on last edited by
        #3

        Dear @Wieland ,
        Thank you so much.

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