1 files changed, 108 insertions, 0 deletions
diff --git a/OpenPGP-Keychain/src/com/google/zxing/qrcode/QRCodeWriter.java b/OpenPGP-Keychain/src/com/google/zxing/qrcode/QRCodeWriter.java
new file mode 100644
index 000000000..fff4f5d1e
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+++ b/OpenPGP-Keychain/src/com/google/zxing/qrcode/QRCodeWriter.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2008 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.zxing.qrcode;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.EncodeHintType;
+import com.google.zxing.Writer;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+import com.google.zxing.qrcode.encoder.ByteMatrix;
+import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
+import com.google.zxing.qrcode.encoder.Encoder;
+import com.google.zxing.qrcode.encoder.QRCode;
+
+import java.util.Hashtable;
+
+/**
+ * This object renders a QR Code as a BitMatrix 2D array of greyscale values.
+ *
+ * @author dswitkin@google.com (Daniel Switkin)
+ */
+public final class QRCodeWriter implements Writer {
+
+  private static final int QUIET_ZONE_SIZE = 0; // patched for Bitcoin Wallet
+
+  public BitMatrix encode(String contents, BarcodeFormat format, int width, int height)
+      throws WriterException {
+
+    return encode(contents, format, width, height, null);
+  }
+
+  public BitMatrix encode(String contents, BarcodeFormat format, int width, int height,
+      Hashtable hints) throws WriterException {
+
+    if (contents == null || contents.length() == 0) {
+      throw new IllegalArgumentException("Found empty contents");
+    }
+
+    if (format != BarcodeFormat.QR_CODE) {
+      throw new IllegalArgumentException("Can only encode QR_CODE, but got " + format);
+    }
+
+    if (width < 0 || height < 0) {
+      throw new IllegalArgumentException("Requested dimensions are too small: " + width + 'x' +
+          height);
+    }
+
+    ErrorCorrectionLevel errorCorrectionLevel = ErrorCorrectionLevel.L;
+    if (hints != null) {
+      ErrorCorrectionLevel requestedECLevel = (ErrorCorrectionLevel) hints.get(EncodeHintType.ERROR_CORRECTION);
+      if (requestedECLevel != null) {
+        errorCorrectionLevel = requestedECLevel;
+      }
+    }
+
+    QRCode code = new QRCode();
+    Encoder.encode(contents, errorCorrectionLevel, hints, code);
+    return renderResult(code, width, height);
+  }
+
+  // Note that the input matrix uses 0 == white, 1 == black, while the output matrix uses
+  // 0 == black, 255 == white (i.e. an 8 bit greyscale bitmap).
+  private static BitMatrix renderResult(QRCode code, int width, int height) {
+    ByteMatrix input = code.getMatrix();
+    int inputWidth = input.getWidth();
+    int inputHeight = input.getHeight();
+    int qrWidth = inputWidth + (QUIET_ZONE_SIZE << 1);
+    int qrHeight = inputHeight + (QUIET_ZONE_SIZE << 1);
+    int outputWidth = Math.max(width, qrWidth);
+    int outputHeight = Math.max(height, qrHeight);
+
+    int multiple = Math.min(outputWidth / qrWidth, outputHeight / qrHeight);
+    // Padding includes both the quiet zone and the extra white pixels to accommodate the requested
+    // dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone.
+    // If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will
+    // handle all the padding from 100x100 (the actual QR) up to 200x160.
+    int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
+    int topPadding = (outputHeight - (inputHeight * multiple)) / 2;
+
+    BitMatrix output = new BitMatrix(outputWidth, outputHeight);
+
+    for (int inputY = 0, outputY = topPadding; inputY < inputHeight; inputY++, outputY += multiple) {
+      // Write the contents of this row of the barcode
+      for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {
+        if (input.get(inputX, inputY) == 1) {
+          output.setRegion(outputX, outputY, multiple, multiple);
+        }
+      }
+    }
+
+    return output;
+  }
+
+}