92 lines
2.5 KiB
C++
92 lines
2.5 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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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 void blitImage(const QImage &source, QImage &target, const QRect &rect)
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{
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Q_ASSERT(source.format() == QImage::Format_ARGB32_Premultiplied);
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Q_ASSERT(target.format() == QImage::Format_ARGB32_Premultiplied);
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const int devicePixelRatio = target.devicePixelRatio();
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const int x = rect.x() * devicePixelRatio;
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const int y = rect.y() * devicePixelRatio;
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const int width = rect.width() * devicePixelRatio;
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const int height = rect.height() * devicePixelRatio;
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for (int i = y; i < y + height; ++i) {
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const uint32_t *in = reinterpret_cast<const uint32_t *>(source.scanLine(i));
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uint32_t *out = reinterpret_cast<uint32_t *>(target.scanLine(i));
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std::copy(in + x, in + x + width, out + x);
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}
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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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for (const QRect &rect : region) {
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blitImage(source, target, rect);
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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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