| 1 | // Copyright (C) 2022 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only |
| 3 | |
| 4 | #include "fpshelper.h" |
| 5 | |
| 6 | FpsHelper::FpsHelper() |
| 7 | { |
| 8 | setFlag(flag: QQuickItem::ItemHasContents); |
| 9 | |
| 10 | connect(sender: this, signal: &QQuickItem::enabledChanged, slot: [this]() { |
| 11 | if (isEnabled()) { |
| 12 | m_frames = 0; |
| 13 | m_timer.start(); |
| 14 | update(); |
| 15 | } |
| 16 | }); |
| 17 | |
| 18 | if (isEnabled()) |
| 19 | m_timer.start(); |
| 20 | } |
| 21 | |
| 22 | float FpsHelper::fps() const |
| 23 | { |
| 24 | return m_fps; |
| 25 | } |
| 26 | |
| 27 | QSGNode *FpsHelper::updatePaintNode(QSGNode *node, UpdatePaintNodeData *) |
| 28 | { |
| 29 | m_frames++; |
| 30 | qint64 nsElapsed = m_timer.nsecsElapsed(); |
| 31 | float ms = float(nsElapsed / 1000000.0); |
| 32 | if (ms >= 1000.0f) { |
| 33 | float fps = m_frames / (ms / 1000.0f); |
| 34 | // Round to 0.2 accuracy |
| 35 | fps = std::round(x: fps * 5.0f) / 5.0f; |
| 36 | if (!qFuzzyCompare(p1: fps, p2: m_fps)) { |
| 37 | m_fps = fps; |
| 38 | Q_EMIT fpsChanged(); |
| 39 | } |
| 40 | m_frames = 0; |
| 41 | m_timer.restart(); |
| 42 | } |
| 43 | |
| 44 | // Call update in a loop if fps tracking is enabled |
| 45 | if (isEnabled()) |
| 46 | update(); |
| 47 | |
| 48 | return node; |
| 49 | } |
| 50 |