decode() [2/3]

bool fl::Jpeg::decode ( const JpegConfig & config, fl::span< const fl::u8 > data, Frame * frame, fl::string * error_message = nullptr )

static

Definition at line 296 of file jpeg.cpp.hpp.

                                                                                                          {
    if (!frame) {
        if (error_message) {
            *error_message = "Frame pointer is null";
        }
        return false;
    }
 
    if (!frame->isFromCodec() || frame->getWidth() == 0 || frame->getHeight() == 0) {
        if (error_message) {
            *error_message = "Target frame must be created with proper dimensions for in-place decoding";
        }
        return false;
    }
 
    auto decoder = createDecoder(config);
    auto stream = fl::make_shared<fl::memorybuf>(data.size());
    stream->write(data);
 
    if (!decoder->begin(stream)) {
        if (error_message) {
            decoder->hasError(error_message);
        }
        return false;
    }
 
    DecodeResult result = decoder->decode();
    if (result != DecodeResult::Success) {
        if (error_message) {
            decoder->hasError(error_message);
        }
        return false;
    }
 
    Frame decoded = decoder->getCurrentFrame();
 
    if (frame->getWidth() != decoded.getWidth() || frame->getHeight() != decoded.getHeight()) {
        if (error_message) {
            *error_message = "Target frame dimensions do not match decoded image dimensions";
        }
        return false;
    }
 
    frame->copy(decoded);
    return true;
}

References fl::Frame::copy(), createDecoder(), fl::Frame::getHeight(), fl::Frame::getWidth(), fl::Frame::isFromCodec(), fl::make_shared(), fl::span< T, Extent >::size(), and fl::Success.

Referenced by decode(), fl::FileSystem::loadJpeg(), and CodecProcessor::processJpeg().

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