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#include "Decoder.h"
#include <limits>
#include "quirc.h"
QrDecoder::QrDecoder()
: m_qr(quirc_new())
{
if (m_qr == nullptr)
{
throw std::runtime_error("QUIRC: failed to allocate memory");
}
}
QrDecoder::~QrDecoder()
{
quirc_destroy(m_qr);
}
std::vector<std::string> QrDecoder::decode(const QImage &image)
{
if (image.format() == QImage::Format_Grayscale8)
{
return decodeGrayscale8(image);
}
return decodeGrayscale8(image.convertToFormat(QImage::Format_Grayscale8));
}
std::vector<std::string> QrDecoder::decodeGrayscale8(const QImage &image)
{
if (quirc_resize(m_qr, image.width(), image.height()) < 0)
{
throw std::runtime_error("QUIRC: failed to allocate video memory");
}
uint8_t *rawImage = quirc_begin(m_qr, nullptr, nullptr);
if (rawImage == nullptr)
{
throw std::runtime_error("QUIRC: failed to get image buffer");
}
#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
std::copy(image.constBits(), image.constBits() + image.sizeInBytes(), rawImage);
#else
std::copy(image.constBits(), image.constBits() + image.byteCount(), rawImage);
#endif
quirc_end(m_qr);
const int count = quirc_count(m_qr);
if (count < 0)
{
throw std::runtime_error("QUIRC: failed to get the number of recognized QR-codes");
}
std::vector<std::string> result;
result.reserve(static_cast<size_t>(count));
for (int index = 0; index < count; ++index)
{
quirc_code code;
quirc_extract(m_qr, index, &code);
quirc_data data;
const quirc_decode_error_t err = quirc_decode(&code, &data);
if (err == QUIRC_SUCCESS)
{
result.emplace_back(&data.payload[0], &data.payload[data.payload_len]);
}
}
return result;
}
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