1 files changed, 223 insertions, 0 deletions
diff --git a/src/plugins/platforms/cocoa/qnsview_drawing.mm b/src/plugins/platforms/cocoa/qnsview_drawing.mm
new file mode 100644
index 0000000000..3bba68b0cf
--- /dev/null
+++ b/src/plugins/platforms/cocoa/qnsview_drawing.mm
@@ -0,0 +1,223 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// This file is included from qnsview.mm, and only used to organize the code
+
+@implementation QT_MANGLE_NAMESPACE(QNSView) (DrawingAPI)
+
+- (void)requestUpdate
+{
+    if (self.needsDisplay) {
+        // If the view already has needsDisplay set it means that there may be code waiting for
+        // a real expose event, so we can't issue setNeedsDisplay now as a way to trigger an
+        // update request. We will re-trigger requestUpdate from drawRect.
+        return;
+    }
+
+    [self setNeedsDisplay:YES];
+    m_updateRequested = true;
+}
+
+#ifndef QT_NO_OPENGL
+- (void)setQCocoaGLContext:(QCocoaGLContext *)context
+{
+    m_glContext = context;
+    [m_glContext->nsOpenGLContext() setView:self];
+    if (![m_glContext->nsOpenGLContext() view]) {
+        //was unable to set view
+        m_shouldSetGLContextinDrawRect = true;
+    }
+}
+#endif
+
+@end
+
+@implementation QT_MANGLE_NAMESPACE(QNSView) (Drawing)
+
+- (BOOL)isOpaque
+{
+    if (!m_platformWindow)
+        return true;
+    return m_platformWindow->isOpaque();
+}
+
+- (BOOL)isFlipped
+{
+    return YES;
+}
+
+- (void)setNeedsDisplayInRect:(NSRect)rect
+{
+    [super setNeedsDisplayInRect:rect];
+    m_updateRequested = false;
+}
+
+- (void)drawRect:(NSRect)dirtyRect
+{
+    Q_UNUSED(dirtyRect);
+
+    if (!m_platformWindow)
+        return;
+
+    QRegion exposedRegion;
+    const NSRect *dirtyRects;
+    NSInteger numDirtyRects;
+    [self getRectsBeingDrawn:&dirtyRects count:&numDirtyRects];
+    for (int i = 0; i < numDirtyRects; ++i)
+        exposedRegion += QRectF::fromCGRect(dirtyRects[i]).toRect();
+
+    qCDebug(lcQpaDrawing) << "[QNSView drawRect:]" << m_platformWindow->window() << exposedRegion;
+    [self updateRegion:exposedRegion];
+}
+
+- (void)updateRegion:(QRegion)dirtyRegion
+{
+#ifndef QT_NO_OPENGL
+    if (m_glContext && m_shouldSetGLContextinDrawRect) {
+        [m_glContext->nsOpenGLContext() setView:self];
+        m_shouldSetGLContextinDrawRect = false;
+    }
+#endif
+
+    if (m_updateRequested) {
+        Q_ASSERT(m_platformWindow->hasPendingUpdateRequest());
+        m_platformWindow->deliverUpdateRequest();
+        m_updateRequested = false;
+    } else {
+        m_platformWindow->handleExposeEvent(dirtyRegion);
+    }
+
+    if (m_updateRequested && m_platformWindow->hasPendingUpdateRequest()) {
+        // A call to QWindow::requestUpdate was issued during event delivery above,
+        // but AppKit will reset the needsDisplay state of the view after completing
+        // the current display cycle, so we need to defer the request to redisplay.
+        // FIXME: Perhaps this should be a trigger to enable CADisplayLink?
+        qCDebug(lcQpaDrawing) << "[QNSView drawRect:] issuing deferred setNeedsDisplay due to pending update request";
+        dispatch_async(dispatch_get_main_queue (), ^{ [self requestUpdate]; });
+    }
+}
+
+- (BOOL)wantsLayer
+{
+    Q_ASSERT(m_platformWindow);
+
+    // Toggling the private QWindow property or the environment variable
+    // on and off is not a supported use-case, so this code is effectively
+    // returning a constant for the lifetime of our QSNSView, which means
+    // we don't care about emitting KVO signals for @"wantsLayer".
+    return qt_mac_resolveOption(false, m_platformWindow->window(),
+        "_q_mac_wantsLayer", "QT_MAC_WANTS_LAYER");
+}
+
+- (CALayer *)makeBackingLayer
+{
+    bool makeMetalLayer = false; // TODO: Add/implement enabling API
+    if (makeMetalLayer) {
+        // Check if Metal is supported. If it isn't then it's most likely
+        // too late at this point and the QWindow will be non-functional,
+        // but we can at least print a warning.
+        if (![MTLCreateSystemDefaultDevice() autorelease]) {
+            qWarning() << "QWindow initialization error: Metal is not supported";
+            return [super makeBackingLayer];
+        }
+
+        CAMetalLayer *layer = [CAMetalLayer layer];
+
+        // Set the contentsScale for the layer. This is normally done in
+        // viewDidChangeBackingProperties, however on startup that function
+        // is called before the layer is created here. The layer's drawableSize
+        // is updated from layoutSublayersOfLayer as usual.
+        layer.contentsScale = self.window.backingScaleFactor;
+
+        return layer;
+    }
+
+    return [super makeBackingLayer];
+}
+
+- (NSViewLayerContentsRedrawPolicy)layerContentsRedrawPolicy
+{
+    // We need to set this this excplicitly since the super implementation
+    // returns LayerContentsRedrawNever for custom layers like CAMetalLayer.
+    return NSViewLayerContentsRedrawDuringViewResize;
+}
+
+- (void)updateMetalLayerDrawableSize:(CAMetalLayer *)layer
+{
+    CGSize drawableSize = layer.bounds.size;
+    drawableSize.width *= layer.contentsScale;
+    drawableSize.height *= layer.contentsScale;
+    layer.drawableSize = drawableSize;
+}
+
+- (void)layoutSublayersOfLayer:(CALayer *)layer
+{
+    if ([layer isKindOfClass:CAMetalLayer.class])
+        [self updateMetalLayerDrawableSize:static_cast<CAMetalLayer* >(layer)];
+}
+
+- (void)displayLayer:(CALayer *)layer
+{
+    Q_ASSERT(layer == self.layer);
+
+    if (!m_platformWindow)
+        return;
+
+    qCDebug(lcQpaDrawing) << "[QNSView displayLayer]" << m_platformWindow->window();
+
+    // FIXME: Find out if there's a way to resolve the dirty rect like in drawRect:
+    [self updateRegion:QRectF::fromCGRect(self.bounds).toRect()];
+}
+
+- (void)viewDidChangeBackingProperties
+{
+    CALayer *layer = self.layer;
+    if (!layer)
+        return;
+
+    layer.contentsScale = self.window.backingScaleFactor;
+
+    // Metal layers must be manually updated on e.g. screen change
+    if ([layer isKindOfClass:CAMetalLayer.class]) {
+        [self updateMetalLayerDrawableSize:static_cast<CAMetalLayer* >(layer)];
+        [self setNeedsDisplay:YES];
+    }
+}
+
+@end