Function draw_qrcode

libavfilter/qrencode.c:364–574

#endif

static int draw_qrcode(AVFilterContext *ctx, AVFrame *frame)
{
    QREncodeContext *qr = ctx->priv;
    struct SwsContext *sws = NULL;
    QRcode *qrcode = NULL;
    int i, j;
    char qrcode_width_changed;
    int ret;
    int offset;
    uint8_t *srcp;
    uint8_t *dstp0, *dstp;

    av_bprint_clear(&qr->expanded_text);

    switch (qr->expansion) {
    case EXPANSION_NONE:
        av_bprintf(&qr->expanded_text, "%s", qr->text);
        break;
    case EXPANSION_NORMAL:
        if ((ret = ff_expand_text(&qr->expand_text, qr->text, &qr->expanded_text)) < 0)
            return ret;
        break;
    }

    if (!qr->expanded_text.str || qr->expanded_text.str[0] == 0) {
        if (qr->is_source) {
            ff_fill_rectangle(&qr->draw0, &qr->draw0_background_color,
                              frame->data, frame->linesize,
                              0, 0, qr->rendered_padded_qrcode_width, qr->rendered_padded_qrcode_width);
        }

        return 0;
    }

    av_log(ctx, AV_LOG_DEBUG, "Encoding string '%s'\n", qr->expanded_text.str);
    qrcode = QRcode_encodeString(qr->expanded_text.str, 1, qr->level, QR_MODE_8,
                                 qr->case_sensitive);
    if (!qrcode) {
        ret = AVERROR(errno);
        av_log(ctx, AV_LOG_ERROR,
               "Failed to encode string with error \'%s\'\n", av_err2str(ret));
        goto end;
    }

    av_log(ctx, AV_LOG_DEBUG,
           "Encoded QR with width:%d version:%d\n", qrcode->width, qrcode->version);
#ifdef DEBUG
    show_qrcode(ctx, (const QRcode *)qrcode);
#endif

    qrcode_width_changed = qr->qrcode_width != qrcode->width;
    qr->qrcode_width = qrcode->width;

    // realloc mask if needed
    if (qrcode_width_changed) {
        av_freep(&qr->qrcode_mask_data[0]);
        ret = av_image_alloc(qr->qrcode_mask_data, qr->qrcode_mask_linesize,
                             qrcode->width, qrcode->width,