feat: replace canvas -> c++ component

Also add c++ ring buffer

1 files changed, 94 insertions, 0 deletions

diff --git a/plugin/src/Caelestia/Internal/circularbuffer.cpp b/plugin/src/Caelestia/Internal/circularbuffer.cpp
new file mode 100644
index 0000000..9701e7f
--- /dev/null
+++ b/plugin/src/Caelestia/Internal/circularbuffer.cpp
@@ -0,0 +1,94 @@
+#include "circularbuffer.hpp"
+
+#include <algorithm>
+
+namespace caelestia::internal {
+
+CircularBuffer::CircularBuffer(QObject* parent)
+    : QObject(parent) {}
+
+int CircularBuffer::capacity() const {
+    return m_capacity;
+}
+
+void CircularBuffer::setCapacity(int capacity) {
+    if (capacity < 0)
+        capacity = 0;
+    if (m_capacity == capacity)
+        return;
+
+    const auto old = values();
+
+    m_capacity = capacity;
+    m_data.resize(capacity);
+    m_data.fill(0.0);
+    m_head = 0;
+    m_count = 0;
+
+    // Re-push old values, keeping the most recent ones
+    const auto start = old.size() > capacity ? old.size() - capacity : 0;
+    for (auto i = start; i < old.size(); ++i) {
+        m_data[m_head] = old[i];
+        m_head = (m_head + 1) % m_capacity;
+        m_count++;
+    }
+
+    emit capacityChanged();
+    emit countChanged();
+    emit valuesChanged();
+}
+
+int CircularBuffer::count() const {
+    return m_count;
+}
+
+QList<qreal> CircularBuffer::values() const {
+    QList<qreal> result;
+    result.reserve(m_count);
+    for (int i = 0; i < m_count; ++i)
+        result.append(at(i));
+    return result;
+}
+
+qreal CircularBuffer::maximum() const {
+    if (m_count == 0)
+        return 0.0;
+
+    qreal maxVal = at(0);
+    for (int i = 1; i < m_count; ++i)
+        maxVal = std::max(maxVal, at(i));
+    return maxVal;
+}
+
+void CircularBuffer::push(qreal value) {
+    if (m_capacity <= 0)
+        return;
+
+    m_data[m_head] = value;
+    m_head = (m_head + 1) % m_capacity;
+    if (m_count < m_capacity) {
+        m_count++;
+        emit countChanged();
+    }
+    emit valuesChanged();
+}
+
+void CircularBuffer::clear() {
+    if (m_count == 0)
+        return;
+
+    m_head = 0;
+    m_count = 0;
+    emit countChanged();
+    emit valuesChanged();
+}
+
+qreal CircularBuffer::at(int index) const {
+    if (index < 0 || index >= m_count)
+        return 0.0;
+
+    const int actualIndex = (m_head - m_count + index + m_capacity) % m_capacity;
+    return m_data[actualIndex];
+}
+
+} // namespace caelestia::internal