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[buffer] add method to read last image

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This commit is contained in:
Jan Grewe 2020-03-13 11:58:34 +01:00
parent bc09438f2a
commit 506bb98879
2 changed files with 18 additions and 1 deletions
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18
imagebuffer.cpp
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@ -46,7 +46,7 @@ void ImageBuffer::push(const MyImage &img) {
if (load < static_cast<int64_t>(buffer.capacity())) if (load < static_cast<int64_t>(buffer.capacity()))
load += 1; load += 1;
mutex.unlock(); mutex.unlock();
std::cerr << "load: " << bufferLoad() << "\t pressure: " << bufferPreassure() << std::endl; //std::cerr << "load: " << bufferLoad() << "\t pressure: " << bufferPreassure() << std::endl;
} }
bool ImageBuffer::bufferNotEmpty() { bool ImageBuffer::bufferNotEmpty() {
@ -69,3 +69,19 @@ bool ImageBuffer::pop(MyImage &img) {
return ret; return ret;
} }
bool ImageBuffer::readLast(MyImage &img) {
bool ret = false;
mutex.lock();
if (load > 0) {
size_t idx;
if (current_write_index != 0) {
idx = static_cast<size_t>(current_write_index) - 1;
} else {
idx = buffer.capacity() -1;
}
img = buffer[idx];
ret = true;
}
mutex.unlock();
return ret;
}

1
imagebuffer.h
View File

@ -17,6 +17,7 @@ public:
void resize(size_t new_size); void resize(size_t new_size);
void push(const MyImage &img); void push(const MyImage &img);
bool pop(MyImage &img); bool pop(MyImage &img);
bool readLast(MyImage &img);
size_t capacity(); size_t capacity();
double bufferPreassure(); double bufferPreassure();
int64_t bufferLoad(); int64_t bufferLoad();