M src/platform/qt/CoreController.cpp → src/platform/qt/CoreController.cpp

@@ -798,8 +798,8 @@ if (m_activeBuffer == m_completeBuffer) {
 		m_activeBuffer = &m_buffers[1];
 	}
 	// Copy contents to avoid issues when doing frameskip
-	*m_activeBuffer = *m_completeBuffer;
-	m_threadContext.core->setVideoBuffer(m_threadContext.core, reinterpret_cast<color_t*>(m_activeBuffer->data()), screenDimensions().width());
+	memcpy(m_activeBuffer->data(), m_completeBuffer->data(), m_activeBuffer->size());
+	m_threadContext.core->setVideoBuffer(m_threadContext.core, reinterpret_cast<color_t*>(m_activeBuffer->data()), 256);
 
 	for (auto& action : m_frameActions) {
 		action();