| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #include "qpaintdevice.h" |
| 5 | |
| 6 | QT_BEGIN_NAMESPACE |
| 7 | |
| 8 | QPaintDevice::QPaintDevice() noexcept |
| 9 | { |
| 10 | painters = 0; |
| 11 | } |
| 12 | |
| 13 | QPaintDevice::~QPaintDevice() |
| 14 | { |
| 15 | if (paintingActive()) |
| 16 | qWarning(msg: "QPaintDevice: Cannot destroy paint device that is being " |
| 17 | "painted"); |
| 18 | } |
| 19 | |
| 20 | |
| 21 | /*! |
| 22 | \internal |
| 23 | */ |
| 24 | void QPaintDevice::initPainter(QPainter *) const |
| 25 | { |
| 26 | } |
| 27 | |
| 28 | /*! |
| 29 | \internal |
| 30 | */ |
| 31 | QPaintDevice *QPaintDevice::redirected(QPoint *) const |
| 32 | { |
| 33 | return nullptr; |
| 34 | } |
| 35 | |
| 36 | /*! |
| 37 | \internal |
| 38 | */ |
| 39 | QPainter *QPaintDevice::sharedPainter() const |
| 40 | { |
| 41 | return nullptr; |
| 42 | } |
| 43 | |
| 44 | Q_GUI_EXPORT int qt_paint_device_metric(const QPaintDevice *device, QPaintDevice::PaintDeviceMetric metric) |
| 45 | { |
| 46 | return device->metric(metric); |
| 47 | } |
| 48 | |
| 49 | int QPaintDevice::metric(PaintDeviceMetric m) const |
| 50 | { |
| 51 | // Fallback: A subclass has not implemented PdmDevicePixelRatioScaled but might |
| 52 | // have implemented PdmDevicePixelRatio. |
| 53 | if (m == PdmDevicePixelRatioScaled) |
| 54 | return this->metric(m: PdmDevicePixelRatio) * devicePixelRatioFScale(); |
| 55 | |
| 56 | qWarning(msg: "QPaintDevice::metrics: Device has no metric information"); |
| 57 | |
| 58 | if (m == PdmDpiX) { |
| 59 | return 72; |
| 60 | } else if (m == PdmDpiY) { |
| 61 | return 72; |
| 62 | } else if (m == PdmNumColors) { |
| 63 | // FIXME: does this need to be a real value? |
| 64 | return 256; |
| 65 | } else if (m == PdmDevicePixelRatio) { |
| 66 | return 1; |
| 67 | } else { |
| 68 | qDebug(msg: "Unrecognised metric %d!",m); |
| 69 | return 0; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | QT_END_NAMESPACE |
| 74 |