Class: Rdmtx

Inherits:
Object
  • Object
show all
Defined in:
ext/rdmtx/Rdmtx.c

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Object 



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# File 'ext/rdmtx/Rdmtx.c', line 28

static VALUE rdmtx_init(VALUE self) {
    return self;
}

Instance Method Details

#decode ⇒ Object

Timeout in msec



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# File 'ext/rdmtx/Rdmtx.c', line 32

static VALUE rdmtx_decode(VALUE self, VALUE image /* Image from RMagick (Magick::Image) */, VALUE timeout /* Timeout in msec */) {

    VALUE rawImageString = rb_funcall(image, rb_intern("export_pixels_to_str"), 0);

    VALUE safeImageString = StringValue(rawImageString);

    char * imageBuffer = RSTRING_PTR(safeImageString);

    int width = NUM2INT(rb_funcall(image, rb_intern("columns"), 0));
    int height = NUM2INT(rb_funcall(image, rb_intern("rows"), 0));

    DmtxImage *dmtxImage = dmtxImageCreate((unsigned char *)imageBuffer, width,
          height, DmtxPack24bppRGB);

    VALUE results = rb_ary_new();

    /* Initialize decode struct for newly loaded image */
    DmtxDecode * decode = dmtxDecodeCreate(dmtxImage, 1);

    DmtxRegion * region;
    DmtxMessage * message;

    int intTimeout = NUM2INT(timeout);
    DmtxTime dmtxTimeout = dmtxTimeAdd(dmtxTimeNow(), intTimeout);

    for(;;) {
        if (intTimeout == 0) {
            region = dmtxRegionFindNext(decode, NULL);
        } else {
            region = dmtxRegionFindNext(decode, &dmtxTimeout);
        }

        if (region == NULL )
            break;

        message = dmtxDecodeMatrixRegion(decode, region, DmtxUndefined);
        if (message != NULL) {
            VALUE outputString = rb_str_new2((char *)message->output);
            rb_ary_push(results, outputString);
            dmtxMessageDestroy(&message);
        }

        dmtxRegionDestroy(&region);
    }

    dmtxDecodeDestroy(&decode);
    dmtxImageDestroy(&dmtxImage);

    return results;
}

#encode(*args) ⇒ Object 



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# File 'ext/rdmtx/Rdmtx.c', line 83

static VALUE rdmtx_encode(int argc, VALUE * argv, VALUE self) {

    VALUE string, margin, module, size;
    VALUE safeString;
    VALUE magickImageClass;
    VALUE outputImage;

    int safeMargin, safeModule, safeSize;
    int width;
    int height;
    DmtxEncode * enc;

    rb_scan_args(argc, argv, "13", &string,
                 &margin, &module, &size);

    safeString = StringValue(string);
    if(NIL_P(margin)) {
        safeMargin = 5;
    } else {
        safeMargin = NUM2INT(margin);
    }
    if(NIL_P(module)) {
        safeModule = 5;
    } else {
        safeModule = NUM2INT(module);
    }
    if(NIL_P(size)) {
        safeSize = DmtxSymbolSquareAuto;
    } else {
        safeSize = NUM2INT(size);
    }

    // printf("Margin = %d, Module = %d, Size = %d\n", safeMargin, safeModule, safeSize);

    /* Create and initialize libdmtx structures */
    enc = dmtxEncodeCreate();

    dmtxEncodeSetProp(enc, DmtxPropPixelPacking, DmtxPack24bppRGB);
    dmtxEncodeSetProp(enc, DmtxPropSizeRequest, safeSize);

    dmtxEncodeSetProp(enc, DmtxPropMarginSize, safeMargin);
    dmtxEncodeSetProp(enc, DmtxPropModuleSize, safeModule);

    /* Create barcode image */
    if (dmtxEncodeDataMatrix(enc, RSTRING_LEN(safeString),
            (unsigned char *)RSTRING_PTR(safeString)) == DmtxFail) {
//        printf("Fatal error !\n");
        dmtxEncodeDestroy(&enc);
        return Qnil;
    }

    width = dmtxImageGetProp(enc->image, DmtxPropWidth);
    height = dmtxImageGetProp(enc->image, DmtxPropHeight);

    magickImageClass = rb_path2class("Magick::Image");
    outputImage = rb_funcall(magickImageClass, rb_intern("new"), 2, INT2NUM(width), INT2NUM(height));

    rb_funcall(outputImage, rb_intern("import_pixels"), 7,
               INT2NUM(0),
               INT2NUM(0),
               INT2NUM(width),
               INT2NUM(height),
               rb_str_new("RGB", 3),
               rb_str_new((char *)enc->image->pxl, 3*width*height),
//               rb_const_get("Magick" ,rb_intern("CharPixel"))
               rb_eval_string("Magick::CharPixel"));

    /* Clean up */
    dmtxEncodeDestroy(&enc);

    return outputImage;
}