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5.13.2: qnsview_drawing.mm original
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kleuter
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5.13.2/qtbase/src/plugins/platforms/cocoa/qnsview_drawing.mm
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5.13.2/qtbase/src/plugins/platforms/cocoa/qnsview_drawing.mm
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/****************************************************************************
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**
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** Copyright (C) 2018 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the plugins of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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// This file is included from qnsview.mm, and only used to organize the code
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@implementation QT_MANGLE_NAMESPACE(QNSView) (Drawing)
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- (void)initDrawing
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{
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self.wantsLayer = [self layerExplicitlyRequested]
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|| [self shouldUseMetalLayer]
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|| [self layerEnabledByMacOS];
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// Enable high-DPI OpenGL for retina displays. Enabling has the side
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// effect that Cocoa will start calling glViewport(0, 0, width, height),
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// overriding any glViewport calls in application code. This is usually not a
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// problem, except if the application wants to have a "custom" viewport.
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// (like the hellogl example)
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if (m_platformWindow->window()->supportsOpenGL()) {
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self.wantsBestResolutionOpenGLSurface = qt_mac_resolveOption(YES, m_platformWindow->window(),
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"_q_mac_wantsBestResolutionOpenGLSurface", "QT_MAC_WANTS_BEST_RESOLUTION_OPENGL_SURFACE");
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// See also QCocoaGLContext::makeCurrent for software renderer workarounds.
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}
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}
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- (BOOL)isOpaque
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{
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if (!m_platformWindow)
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return true;
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return m_platformWindow->isOpaque();
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}
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- (BOOL)isFlipped
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{
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return YES;
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}
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- (void)drawRect:(NSRect)dirtyRect
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{
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Q_UNUSED(dirtyRect);
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if (!m_platformWindow)
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return;
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QRegion exposedRegion;
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const NSRect *dirtyRects;
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NSInteger numDirtyRects;
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[self getRectsBeingDrawn:&dirtyRects count:&numDirtyRects];
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for (int i = 0; i < numDirtyRects; ++i)
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exposedRegion += QRectF::fromCGRect(dirtyRects[i]).toRect();
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qCDebug(lcQpaDrawing) << "[QNSView drawRect:]" << m_platformWindow->window() << exposedRegion;
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m_platformWindow->handleExposeEvent(exposedRegion);
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}
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- (BOOL)layerEnabledByMacOS
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{
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// AppKit has its own logic for this, but if we rely on that, our layers are created
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// by AppKit at a point where we've already set up other parts of the platform plugin
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// based on the presence of layers or not. Once we've rewritten these parts to support
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// dynamically picking up layer enablement we can let AppKit do its thing.
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return QMacVersion::buildSDK() >= QOperatingSystemVersion::MacOSMojave
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&& QMacVersion::currentRuntime() >= QOperatingSystemVersion::MacOSMojave;
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}
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- (BOOL)layerExplicitlyRequested
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{
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static bool wantsLayer = [&]() {
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int wantsLayer = qt_mac_resolveOption(-1, m_platformWindow->window(),
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"_q_mac_wantsLayer", "QT_MAC_WANTS_LAYER");
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if (wantsLayer != -1 && [self layerEnabledByMacOS]) {
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qCWarning(lcQpaDrawing) << "Layer-backing cannot be explicitly controlled on 10.14 when built against the 10.14 SDK";
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return true;
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}
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return wantsLayer == 1;
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}();
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return wantsLayer;
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}
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- (BOOL)shouldUseMetalLayer
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{
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// MetalSurface needs a layer, and so does VulkanSurface (via MoltenVK)
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QSurface::SurfaceType surfaceType = m_platformWindow->window()->surfaceType();
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return surfaceType == QWindow::MetalSurface || surfaceType == QWindow::VulkanSurface;
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}
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- (CALayer *)makeBackingLayer
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{
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if ([self shouldUseMetalLayer]) {
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// Check if Metal is supported. If it isn't then it's most likely
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// too late at this point and the QWindow will be non-functional,
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// but we can at least print a warning.
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if (![MTLCreateSystemDefaultDevice() autorelease]) {
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qWarning() << "QWindow initialization error: Metal is not supported";
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return [super makeBackingLayer];
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}
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CAMetalLayer *layer = [CAMetalLayer layer];
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// Set the contentsScale for the layer. This is normally done in
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// viewDidChangeBackingProperties, however on startup that function
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// is called before the layer is created here. The layer's drawableSize
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// is updated from layoutSublayersOfLayer as usual.
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layer.contentsScale = self.window.backingScaleFactor;
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return layer;
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}
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return [super makeBackingLayer];
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}
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- (void)setLayer:(CALayer *)layer
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{
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qCDebug(lcQpaDrawing) << "Making" << self << "layer-backed with" << layer
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<< "due to being" << ([self layerExplicitlyRequested] ? "explicitly requested"
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: [self shouldUseMetalLayer] ? "needed by surface type" : "enabled by macOS");
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[super setLayer:layer];
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layer.delegate = self;
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}
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- (NSViewLayerContentsRedrawPolicy)layerContentsRedrawPolicy
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{
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// We need to set this explicitly since the super implementation
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// returns LayerContentsRedrawNever for custom layers like CAMetalLayer.
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return NSViewLayerContentsRedrawDuringViewResize;
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}
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#if 0 // Disabled until we enable lazy backingstore resizing
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- (NSViewLayerContentsPlacement)layerContentsPlacement
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{
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// Always place the layer at top left without any automatic scaling,
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// so that we can re-use larger layers when resizing a window down.
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return NSViewLayerContentsPlacementTopLeft;
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}
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#endif
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- (void)updateMetalLayerDrawableSize:(CAMetalLayer *)layer
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{
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CGSize drawableSize = layer.bounds.size;
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drawableSize.width *= layer.contentsScale;
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drawableSize.height *= layer.contentsScale;
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layer.drawableSize = drawableSize;
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}
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- (void)layoutSublayersOfLayer:(CALayer *)layer
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{
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if ([layer isKindOfClass:CAMetalLayer.class])
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[self updateMetalLayerDrawableSize:static_cast<CAMetalLayer* >(layer)];
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}
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- (void)displayLayer:(CALayer *)layer
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{
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if (!NSThread.isMainThread) {
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// Qt is calling AppKit APIs such as -[NSOpenGLContext setView:] on secondary threads,
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// which we shouldn't do. This may result in AppKit (wrongly) triggering a display on
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// the thread where we made the call, so block it here and defer to the main thread.
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qCWarning(lcQpaDrawing) << "Display non non-main thread! Deferring to main thread";
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dispatch_async(dispatch_get_main_queue(), ^{ self.needsDisplay = YES; });
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return;
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}
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Q_ASSERT(layer == self.layer);
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if (!m_platformWindow)
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return;
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qCDebug(lcQpaDrawing) << "[QNSView displayLayer]" << m_platformWindow->window();
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// FIXME: Find out if there's a way to resolve the dirty rect like in drawRect:
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m_platformWindow->handleExposeEvent(QRectF::fromCGRect(self.bounds).toRect());
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}
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- (void)viewDidChangeBackingProperties
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{
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CALayer *layer = self.layer;
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if (!layer)
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return;
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layer.contentsScale = self.window.backingScaleFactor;
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// Metal layers must be manually updated on e.g. screen change
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if ([layer isKindOfClass:CAMetalLayer.class]) {
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[self updateMetalLayerDrawableSize:static_cast<CAMetalLayer* >(layer)];
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[self setNeedsDisplay:YES];
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}
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}
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@end
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