VuoBarcode.cc

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#include "VuoBarcode.h"
 
#include <OpenGL/CGLMacro.h>
 
#include <zxing/common/GreyscaleLuminanceSource.h>
#include <zxing/common/HybridBinarizer.h>
#include <zxing/MultiFormatReader.h>
#include <zxing/ReaderException.h>
 
#include "module.h"
 
extern "C"
{
#ifdef VUO_COMPILER
VuoModuleMetadata({
                     "title" : "VuoBarcode",
                     "dependencies" : [
                         "VuoImage",
                         "VuoRectangle",
                         "VuoText",
                         "VuoList_VuoText",
                         "zxing"
                     ]
                 });
#endif
}
 
using namespace zxing;
 
VuoText VuoBarcode_read(VuoImage image, VuoInteger format, VuoText *outputFormat, VuoRectangle *outputPosition)
{
    if (!image)
        return NULL;
 
    // For full-color images, GL_LUMINANCE only returns the red channel,
    // but that's typically good enough for barcode detection
    // (and much faster than doing a CPU-side grayscale mix).
    const unsigned char *luma = VuoImage_getBuffer(image, GL_LUMINANCE);
    unsigned char *lumaFlipped = (unsigned char *)malloc(image->pixelsWide * image->pixelsHigh);
    for (int y = 0; y < image->pixelsHigh; ++y)
        memcpy(lumaFlipped + (image->pixelsHigh - y - 1) * image->pixelsWide, luma + y * image->pixelsWide, image->pixelsWide);
 
    try
    {
        ArrayRef<char> d((char *)lumaFlipped, image->pixelsWide * image->pixelsHigh);
        Ref<GreyscaleLuminanceSource> source(new GreyscaleLuminanceSource(d, image->pixelsWide, image->pixelsHigh, 0, 0, image->pixelsWide, image->pixelsHigh));
//      Ref<Binarizer> binarizer(new HybridBinarizer(source));
        Ref<Binarizer> binarizer(new GlobalHistogramBinarizer(source));
        Ref<BinaryBitmap> bir(new BinaryBitmap(binarizer));
 
        DecodeHints hints(DecodeHints::DEFAULT_HINT);
//      hints.setTryHarder(true);
 
        if (format != 0)
        {
            hints.clear();
            if      (format ==  10) hints.addFormat(BarcodeFormat::CODABAR);
            else if (format ==  20) hints.addFormat(BarcodeFormat::CODE_39);
            else if (format ==  30) hints.addFormat(BarcodeFormat::CODE_93);
            else if (format ==  40) hints.addFormat(BarcodeFormat::CODE_128);
            else if (format ==  50) hints.addFormat(BarcodeFormat::EAN_8);
            else if (format ==  60) hints.addFormat(BarcodeFormat::EAN_13);
            else if (format ==  70) hints.addFormat(BarcodeFormat::RSS_14);
            else if (format ==  80) hints.addFormat(BarcodeFormat::RSS_EXPANDED);
            else if (format ==  90) hints.addFormat(BarcodeFormat::ITF);
            else if (format == 100) hints.addFormat(BarcodeFormat::UPC_A);
            else if (format == 110) hints.addFormat(BarcodeFormat::UPC_E);
            else if (format == 200) hints.addFormat(BarcodeFormat::AZTEC);
            else if (format == 210) hints.addFormat(BarcodeFormat::DATA_MATRIX);
            else if (format == 220) hints.addFormat(BarcodeFormat::MAXICODE);
            else if (format == 230) hints.addFormat(BarcodeFormat::PDF_417);
            else if (format == 240) hints.addFormat(BarcodeFormat::QR_CODE);
        }
 
        MultiFormatReader reader;
        Ref<Result> result = reader.decode(bir, hints);
        Ref<String> s = result->getText();
        if (outputPosition)
        {
            // ResultPoints may be 4 corners of the barcode, or 2 line segment endpoints.
            // Turn them into a typical axis-aligned Vuo Coordinates center/size pair.
            ArrayRef< Ref<ResultPoint> > points = result->getResultPoints();
            bool first = true;
            for (int i = 0; i < points->size(); ++i)
            {
                VuoRectangle r = VuoRectangle_make( points[i]->getX()/(image->pixelsWide/2) - 1,
                                                   (image->pixelsHigh/2 - points[i]->getY())/(image->pixelsWide/2),
                                                   0, 0);
                if (first)
                {
                    first = false;
                    *outputPosition = r;
                }
                else
                    *outputPosition = VuoRectangle_union(*outputPosition, r);
            }
        }
        free(lumaFlipped);
 
        int actualFormat = result->getBarcodeFormat().value;
        if      (actualFormat == BarcodeFormat::CODABAR)      *outputFormat = VuoText_make("Codabar");
        else if (actualFormat == BarcodeFormat::CODE_39)      *outputFormat = VuoText_make("Code 39");
        else if (actualFormat == BarcodeFormat::CODE_93)      *outputFormat = VuoText_make("Code 93");
        else if (actualFormat == BarcodeFormat::CODE_128)     *outputFormat = VuoText_make("Code 128");
        else if (actualFormat == BarcodeFormat::EAN_8)        *outputFormat = VuoText_make("EAN-8");
        else if (actualFormat == BarcodeFormat::EAN_13)       *outputFormat = VuoText_make("EAN-13");
        else if (actualFormat == BarcodeFormat::RSS_14)       *outputFormat = VuoText_make("GS1 DataBar-14 (RSS-14)");
        else if (actualFormat == BarcodeFormat::RSS_EXPANDED) *outputFormat = VuoText_make("GS1 DataBar Expanded (RSS Expanded)");
        else if (actualFormat == BarcodeFormat::ITF)          *outputFormat = VuoText_make("Interleaved 2 of 5 (ITF)");
        else if (actualFormat == BarcodeFormat::UPC_A)        *outputFormat = VuoText_make("UPC-A");
        else if (actualFormat == BarcodeFormat::UPC_E)        *outputFormat = VuoText_make("UPC-E");
        else if (actualFormat == BarcodeFormat::AZTEC)        *outputFormat = VuoText_make("Aztec");
        else if (actualFormat == BarcodeFormat::DATA_MATRIX)  *outputFormat = VuoText_make("Data Matrix");
        else if (actualFormat == BarcodeFormat::MAXICODE)     *outputFormat = VuoText_make("MaxiCode");
        else if (actualFormat == BarcodeFormat::PDF_417)      *outputFormat = VuoText_make("PDF417");
        else if (actualFormat == BarcodeFormat::QR_CODE)      *outputFormat = VuoText_make("QR Code");
        else                                                  *outputFormat = VuoText_make("(unknown)");
 
        unsigned long len = s->length();
        char *outputText = (char *)malloc(len+1);
        for(int i = 0; i < len; ++i)
            outputText[i] = s->charAt(i);
        outputText[len] = 0;
        VuoRegister(outputText, free);
        return outputText;
    }
    catch (Exception e)
    {
        // Why does zxing throw an exception for the perfectly normal no-code-detected situation.
        if (strcmp(e.what(), "No code detected"))
            VDebugLog("Exception: %s", e.what());
    }
 
    free(lumaFlipped);
    return NULL;
}