c103eb8f5c
We can use QPainter::drawImage() to update the dirty area of the front buffer. This way, we don't need to call std::copy().
81 lines
2 KiB
C++
81 lines
2 KiB
C++
/*
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KWin - the KDE window manager
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This file is part of the KDE project.
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SPDX-FileCopyrightText: 2015 Martin Gräßlin <mgraesslin@kde.org>
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SPDX-FileCopyrightText: 2019 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "backingstore.h"
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#include "window.h"
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#include "internal_client.h"
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#include <QPainter>
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namespace KWin
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{
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namespace QPA
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{
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BackingStore::BackingStore(QWindow *window)
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: QPlatformBackingStore(window)
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{
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}
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BackingStore::~BackingStore() = default;
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QPaintDevice *BackingStore::paintDevice()
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{
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return &m_backBuffer;
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}
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void BackingStore::resize(const QSize &size, const QRegion &staticContents)
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{
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Q_UNUSED(staticContents)
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if (m_backBuffer.size() == size) {
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return;
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}
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const QPlatformWindow *platformWindow = static_cast<QPlatformWindow *>(window()->handle());
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const qreal devicePixelRatio = platformWindow->devicePixelRatio();
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m_backBuffer = QImage(size * devicePixelRatio, QImage::Format_ARGB32_Premultiplied);
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m_backBuffer.setDevicePixelRatio(devicePixelRatio);
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m_frontBuffer = QImage(size * devicePixelRatio, QImage::Format_ARGB32_Premultiplied);
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m_frontBuffer.setDevicePixelRatio(devicePixelRatio);
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}
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static QRect scaledRect(const QRect &rect, qreal devicePixelRatio)
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{
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return QRect(rect.topLeft() * devicePixelRatio, rect.size() * devicePixelRatio);
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}
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static void blitImage(const QImage &source, QImage &target, const QRegion ®ion)
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{
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QPainter painter(&target);
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for (const QRect &rect : region) {
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painter.drawImage(rect, source, scaledRect(rect, source.devicePixelRatio()));
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}
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}
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void BackingStore::flush(QWindow *window, const QRegion ®ion, const QPoint &offset)
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{
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Q_UNUSED(offset)
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Window *platformWindow = static_cast<Window *>(window->handle());
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InternalClient *client = platformWindow->client();
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if (!client) {
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return;
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}
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blitImage(m_backBuffer, m_frontBuffer, region);
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client->present(m_frontBuffer, region);
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}
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}
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}
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