[buffer] fix read index

imagebuffer.cpp

@@ -33,7 +33,7 @@ void ImageBuffer::resize(size_t new_size) {
   buffer_size = new_size;
   buffer.clear();
   buffer.resize(new_size);
-  current_read_index = -1;
+  current_read_index = 0;
   current_write_index = -1;
   load = 0;
   mutex.unlock();
@@ -46,7 +46,6 @@ void ImageBuffer::push(const MyImage &img) {
   if (load < static_cast<int64_t>(buffer.capacity()))
     load += 1;
   mutex.unlock();
-  //std::cerr << "load: " << bufferLoad() << "\t pressure: " << bufferPreassure() << std::endl;
 }
 
 bool ImageBuffer::bufferNotEmpty() {
@@ -61,9 +60,11 @@ bool ImageBuffer::pop(MyImage &img) {
   bool ret = false;
   mutex.lock();
   if (load > 0) {
+      std::cerr << "Buffer.pop, load: " << load << " read_idx: " << current_read_index << " write_idx: " << current_write_index << std::endl;
     img = buffer[static_cast<size_t>(current_read_index)];
     static_cast<size_t>(current_read_index) < (buffer.capacity() - 1) ? current_read_index += 1 : current_read_index = 0;
     load -= 1;
+    ret = true;
   }
   mutex.unlock();
   return ret;

imagebuffer.h

@@ -24,8 +24,6 @@ public:
   bool bufferNotEmpty();
 
 private:
-  // QWaitCondition bufferNotEmpty; // signals that the consumer can get data
-  // QWaitCondition bufferNotFull; // signals that the producer can store data
   QMutex mutex;
   int numUsedBytes = 0;