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Commit 364740a9 authored by Sadrul Chowdhury's avatar Sadrul Chowdhury
Browse files

[qr] Add a flag to generate inverted QR code. 

Add a flag to the API to generate an inverted QR code. This is useful
when generating a QR code for a dark-mode UI, for example.

Bug: 270429486
Change-Id: I837c3f6d009568e8d501a5d8d1b54664233d64ee
parent cf2879cf

packages/SettingsLib/src/com/android/settingslib/qrcode/QrCodeGenerator.java

+16 −1
Original line number Diff line number Diff line
@@ -40,6 +40,19 @@ public final class QrCodeGenerator { 
     */

    public static Bitmap encodeQrCode(String contents, int size)

            throws WriterException, IllegalArgumentException {

        return encodeQrCode(contents, size, /*invert=*/false);

    }



    /**

     * Generates a barcode image with {@code contents}.

     *

     * @param contents The contents to encode in the barcode

     * @param size     The preferred image size in pixels

     * @param invert   Whether to invert the black/white pixels (e.g. for dark mode)

     * @return Barcode bitmap

     */

    public static Bitmap encodeQrCode(String contents, int size, boolean invert)

            throws WriterException, IllegalArgumentException {

        final Map<EncodeHintType, Object> hints = new HashMap<>();

        if (!isIso88591(contents)) {

            hints.put(EncodeHintType.CHARACTER_SET, StandardCharsets.UTF_8.name());
@@ -48,9 +61,11 @@ public final class QrCodeGenerator { 
        final BitMatrix qrBits = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE,

                size, size, hints);

        final Bitmap bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.RGB_565);

        int setColor = invert ? Color.WHITE : Color.BLACK;

        int unsetColor = invert ? Color.BLACK : Color.WHITE;

        for (int x = 0; x < size; x++) {

            for (int y = 0; y < size; y++) {

                bitmap.setPixel(x, y, qrBits.get(x, y) ? Color.BLACK : Color.WHITE);

                bitmap.setPixel(x, y, qrBits.get(x, y) ? setColor : unsetColor);

            }

        }

        return bitmap;