From fc2f28080d72f155aa013704b597d63cc1ff2182 Mon Sep 17 00:00:00 2001
From: srowen <srowen@59b500cc-1b3d-0410-9834-0bbf25fbcc57>
Date: Wed, 19 Mar 2008 17:10:58 +0000
Subject: [PATCH] Take small advantage of "TRY_HARDER" in QR code decoder

git-svn-id: https://zxing.googlecode.com/svn/trunk@299 59b500cc-1b3d-0410-9834-0bbf25fbcc57
---
 .../src/com/google/zxing/qrcode/QRCodeReader.java |  2 +-
 .../google/zxing/qrcode/detector/Detector.java    | 15 ++++++++++++++-
 .../qrcode/detector/FinderPatternFinder.java      |  7 +++++--
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/core/src/com/google/zxing/qrcode/QRCodeReader.java b/core/src/com/google/zxing/qrcode/QRCodeReader.java
index 34fe999bf..c36fe877d 100644
--- a/core/src/com/google/zxing/qrcode/QRCodeReader.java
+++ b/core/src/com/google/zxing/qrcode/QRCodeReader.java
@@ -61,7 +61,7 @@ public final class QRCodeReader implements Reader {
       decoderResult = decoder.decode(bits);
       points = NO_POINTS;
     } else {
-      DetectorResult result = new Detector(image).detect();
+      DetectorResult result = new Detector(image).detect(hints);
       decoderResult = decoder.decode(result.getBits());
       points = result.getPoints();
     }
diff --git a/core/src/com/google/zxing/qrcode/detector/Detector.java b/core/src/com/google/zxing/qrcode/detector/Detector.java
index fad8b061b..37d3bd342 100644
--- a/core/src/com/google/zxing/qrcode/detector/Detector.java
+++ b/core/src/com/google/zxing/qrcode/detector/Detector.java
@@ -25,6 +25,8 @@ import com.google.zxing.common.DetectorResult;
 import com.google.zxing.common.GridSampler;
 import com.google.zxing.qrcode.decoder.Version;
 
+import java.util.Hashtable;
+
 /**
  * <p>Encapsulates logic that can detect a QR Code in an image, even if the QR Code
  * is rotated or skewed, or partially obscured.</p>
@@ -46,6 +48,17 @@ public final class Detector {
    * @throws ReaderException if no QR Code can be found
    */
   public DetectorResult detect() throws ReaderException {
+    return detect(null);
+  }
+
+  /**
+   * <p>Detects a QR Code in an image, simply.</p>
+   *
+   * @param hints optional hints to detector
+   * @return {@link DetectorResult} encapsulating results of detecting a QR Code
+   * @throws ReaderException if no QR Code can be found
+   */
+  public DetectorResult detect(Hashtable hints) throws ReaderException {
 
     MonochromeBitmapSource image = this.image;
     if (!BlackPointEstimationMethod.TWO_D_SAMPLING.equals(image.getLastEstimationMethod())) {
@@ -53,7 +66,7 @@ public final class Detector {
     }
 
     FinderPatternFinder finder = new FinderPatternFinder(image);
-    FinderPatternInfo info = finder.find();
+    FinderPatternInfo info = finder.find(hints);
 
     FinderPattern topLeft = info.getTopLeft();
     FinderPattern topRight = info.getTopRight();
diff --git a/core/src/com/google/zxing/qrcode/detector/FinderPatternFinder.java b/core/src/com/google/zxing/qrcode/detector/FinderPatternFinder.java
index 91f847382..4bc33d443 100755
--- a/core/src/com/google/zxing/qrcode/detector/FinderPatternFinder.java
+++ b/core/src/com/google/zxing/qrcode/detector/FinderPatternFinder.java
@@ -16,6 +16,7 @@
 
 package com.google.zxing.qrcode.detector;
 
+import com.google.zxing.DecodeHintType;
 import com.google.zxing.MonochromeBitmapSource;
 import com.google.zxing.ReaderException;
 import com.google.zxing.ResultPoint;
@@ -23,6 +24,7 @@ import com.google.zxing.common.BitArray;
 import com.google.zxing.common.Collections;
 import com.google.zxing.common.Comparator;
 
+import java.util.Hashtable;
 import java.util.Vector;
 
 /**
@@ -52,7 +54,8 @@ final class FinderPatternFinder {
     this.possibleCenters = new Vector();
   }
 
-  FinderPatternInfo find() throws ReaderException {
+  FinderPatternInfo find(Hashtable hints) throws ReaderException {
+    boolean tryHarder = hints != null && hints.containsKey(DecodeHintType.TRY_HARDER);
     int maxI = image.getHeight();
     int maxJ = image.getWidth();
     // We are looking for black/white/black/white/black modules in
@@ -61,7 +64,7 @@ final class FinderPatternFinder {
     boolean done = false;
     // We can afford to examine every few lines until we've started finding
     // the patterns
-    int iSkip = BIG_SKIP;
+    int iSkip = tryHarder ? 1 : BIG_SKIP;
     for (int i = iSkip - 1; i < maxI && !done; i += iSkip) {
       // Get a row of black/white values
       BitArray blackRow = image.getBlackRow(i, null, 0, maxJ);