C++ port Binarizer and BinaryBitmap weren't caching rows correctly.

[zxing.git] / cpp / core / src / zxing / Binarizer.cpp

diff --git a/cpp/core/src/zxing/Binarizer.cpp b/cpp/core/src/zxing/Binarizer.cpp
index adaab05..1901382 100644 (file)
--- a/cpp/core/src/zxing/Binarizer.cpp
+++ b/cpp/core/src/zxing/Binarizer.cpp
@@ -23,15 +23,17 @@
 
 namespace zxing {
        
-       Binarizer::Binarizer(Ref<LuminanceSource> source) : source_(source), array_(NULL), matrix_(NULL) {
+       Binarizer::Binarizer(Ref<LuminanceSource> source) : source_(source), array_(NULL), matrix_(NULL), cached_y_(-1) {
        }
        
        Binarizer::~Binarizer() {
        }
        
        Ref<BitArray> Binarizer::getBlackRow(int y, Ref<BitArray> row){
-               if (array_ == NULL)
+               if (array_ == NULL && cached_y_ != y) {
                        array_ = estimateBlackRow(y, row);
+                       cached_y_ = y;
+               }
                return array_;
        }