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kleuter 2019-11-25 20:54:47 +01:00
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5.13.2/qtbase/src/plugins/platforms/cocoa/qcocoabackingstore.mm
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/****************************************************************************
**
** Copyright (C) 2016 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcocoabackingstore.h"
#include "qcocoawindow.h"
#include "qcocoahelpers.h"
#include <QtCore/qmath.h>
#include <QuartzCore/CATransaction.h>
QT_BEGIN_NAMESPACE
QCocoaBackingStore::QCocoaBackingStore(QWindow *window)
: QRasterBackingStore(window)
{
// Ideally this would be plumbed from the platform layer to QtGui, and
// the QBackingStore would be recreated, but we don't have that code yet,
// so at least make sure we invalidate our backingstore when the backing
// properties (color space e.g.) are changed.
NSView *view = static_cast<QCocoaWindow *>(window->handle())->view();
m_backingPropertiesObserver = QMacNotificationObserver(view.window,
NSWindowDidChangeBackingPropertiesNotification, [this]() {
qCDebug(lcQpaBackingStore) << "Backing properties for"
<< this->window() << "did change";
backingPropertiesChanged();
});
}
QCFType<CGColorSpaceRef> QCocoaBackingStore::colorSpace() const
{
NSView *view = static_cast<QCocoaWindow *>(window()->handle())->view();
return QCFType<CGColorSpaceRef>::constructFromGet(view.window.colorSpace.CGColorSpace);
}
// ----------------------------------------------------------------------------
QNSWindowBackingStore::QNSWindowBackingStore(QWindow *window)
: QCocoaBackingStore(window)
{
// Choose an appropriate window depth based on the requested surface format.
// On deep color displays the default bit depth is 16-bit, so unless we need
// that level of precision we opt out of it (and the expensive RGB32 -> RGB64
// conversions that come with it if our backingstore depth does not match).
NSWindow *nsWindow = static_cast<QCocoaWindow *>(window->handle())->view().window;
auto colorSpaceName = NSColorSpaceFromDepth(nsWindow.depthLimit);
static const int kDefaultBitDepth = 8;
auto surfaceFormat = window->requestedFormat();
auto bitsPerSample = qMax(kDefaultBitDepth, qMax(surfaceFormat.redBufferSize(),
qMax(surfaceFormat.greenBufferSize(), surfaceFormat.blueBufferSize())));
// NSBestDepth does not seem to guarantee a window depth deep enough for the
// given bits per sample, even if documented as such. For example, requesting
// 10 bits per sample will not give us a 16-bit format, even if that's what's
// available. Work around this by manually bumping the bit depth.
bitsPerSample = !(bitsPerSample & (bitsPerSample - 1))
? bitsPerSample : qNextPowerOfTwo(bitsPerSample);
auto bestDepth = NSBestDepth(colorSpaceName, bitsPerSample, 0, NO, nullptr);
// Disable dynamic depth limit, otherwise our depth limit will be overwritten
// by AppKit if the window moves to a screen with a different depth. We call
// this before setting the depth limit, as the call will reset the depth to 0.
[nsWindow setDynamicDepthLimit:NO];
qCDebug(lcQpaBackingStore) << "Using" << NSBitsPerSampleFromDepth(bestDepth)
<< "bit window depth for" << nsWindow;
nsWindow.depthLimit = bestDepth;
}
QNSWindowBackingStore::~QNSWindowBackingStore()
{
}
bool QNSWindowBackingStore::windowHasUnifiedToolbar() const
{
Q_ASSERT(window()->handle());
return static_cast<QCocoaWindow *>(window()->handle())->m_drawContentBorderGradient;
}
QImage::Format QNSWindowBackingStore::format() const
{
if (windowHasUnifiedToolbar())
return QImage::Format_ARGB32_Premultiplied;
return QRasterBackingStore::format();
}
void QNSWindowBackingStore::resize(const QSize &size, const QRegion &staticContents)
{
qCDebug(lcQpaBackingStore) << "Resize requested to" << size;
QRasterBackingStore::resize(size, staticContents);
// The window shadow rendered by AppKit is based on the shape/content of the
// NSWindow surface. Technically any flush of the backingstore can result in
// a potentially new shape of the window, and would need a shadow invalidation,
// but this is likely too expensive to do at every flush for the few cases where
// clients change the shape dynamically. One case where we do know that the shadow
// likely needs invalidation, if the window has partially transparent content,
// is after a resize, where AppKit's default shadow may be based on the previous
// window content.
QCocoaWindow *cocoaWindow = static_cast<QCocoaWindow *>(window()->handle());
if (cocoaWindow->isContentView() && !cocoaWindow->isOpaque())
cocoaWindow->m_needsInvalidateShadow = true;
}
/*!
Flushes the given \a region from the specified \a window onto the
screen.
The \a window is the top level window represented by this backingstore,
or a non-transient child of that window.
If the \a window is a child window, the \a region will be in child window
coordinates, and the \a offset will be the child window's offset in relation
to the backingstore's top level window.
*/
void QNSWindowBackingStore::flush(QWindow *window, const QRegion &region, const QPoint &offset)
{
if (m_image.isNull())
return;
// Use local pool so that any stale image references are cleaned up after flushing
QMacAutoReleasePool pool;
const QWindow *topLevelWindow = this->window();
if (window->handle()->isForeignWindow()) {
NSView *view = static_cast<QCocoaWindow *>(window->handle())->view();
NSRect nsRect = NSRectFromCGRect(region.boundingRect().toCGRect());
[view displayRect:nsRect];
return;
}
Q_ASSERT(topLevelWindow->handle() && window->handle());
Q_ASSERT(!topLevelWindow->handle()->isForeignWindow() && !window->handle()->isForeignWindow());
QNSView *topLevelView = qnsview_cast(static_cast<QCocoaWindow *>(topLevelWindow->handle())->view());
QNSView *view = qnsview_cast(static_cast<QCocoaWindow *>(window->handle())->view());
if (lcQpaBackingStore().isDebugEnabled()) {
QString targetViewDescription;
if (view != topLevelView) {
QDebug targetDebug(&targetViewDescription);
targetDebug << "onto" << topLevelView << "at" << offset;
}
qCDebug(lcQpaBackingStore) << "Flushing" << region << "of" << view << qPrintable(targetViewDescription);
}
// Normally a NSView is drawn via drawRect, as part of the display cycle in the
// main runloop, via setNeedsDisplay and friends. AppKit will lock focus on each
// individual view, starting with the top level and then traversing any subviews,
// calling drawRect for each of them. This pull model results in expose events
// sent to Qt, which result in drawing to the backingstore and flushing it.
// Qt may also decide to paint and flush the backingstore via e.g. timers,
// or other events such as mouse events, in which case we're in a push model.
// If there is no focused view, it means we're in the latter case, and need
// to manually flush the NSWindow after drawing to its graphic context.
const bool drawingOutsideOfDisplayCycle = ![NSView focusView];
// We also need to ensure the flushed view has focus, so that the graphics
// context is set up correctly (coordinate system, clipping, etc). Outside
// of the normal display cycle there is no focused view, as explained above,
// so we have to handle it manually. There's also a corner case inside the
// normal display cycle due to way QWidgetBackingStore composits native child
// widgets, where we'll get a flush of a native child during the drawRect of
// its parent/ancestor, and the parent/ancestor being the one locked by AppKit.
// In this case we also need to lock and unlock focus manually.
const bool shouldHandleViewLockManually = [NSView focusView] != view;
if (shouldHandleViewLockManually && ![view lockFocusIfCanDraw]) {
qWarning() << "failed to lock focus of" << view;
return;
}
const qreal devicePixelRatio = m_image.devicePixelRatio();
// If the flushed window is a content view, and we're filling the drawn area
// completely, or it doesn't have a window background we need to preserve,
// we can get away with copying instead of blending the backing store.
QCocoaWindow *cocoaWindow = static_cast<QCocoaWindow *>(window->handle());
const NSCompositingOperation compositingOperation = cocoaWindow->isContentView()
&& (cocoaWindow->isOpaque() || view.window.backgroundColor == NSColor.clearColor)
? NSCompositingOperationCopy : NSCompositingOperationSourceOver;
#ifdef QT_DEBUG
static bool debugBackingStoreFlush = [[NSUserDefaults standardUserDefaults]
boolForKey:@"QtCocoaDebugBackingStoreFlush"];
#endif
// -------------------------------------------------------------------------
// The current contexts is typically a NSWindowGraphicsContext, but can be
// NSBitmapGraphicsContext e.g. when debugging the view hierarchy in Xcode.
// If we need to distinguish things here in the future, we can use e.g.
// [NSGraphicsContext drawingToScreen], or the attributes of the context.
NSGraphicsContext *graphicsContext = [NSGraphicsContext currentContext];
Q_ASSERT_X(graphicsContext, "QCocoaBackingStore",
"Focusing the view should give us a current graphics context");
// Tag backingstore image with color space based on the window.
// Note: This does not copy the underlying image data.
QCFType<CGImageRef> cgImage = CGImageCreateCopyWithColorSpace(
QCFType<CGImageRef>(m_image.toCGImage()), colorSpace());
// Create temporary image to use for blitting, without copying image data
NSImage *backingStoreImage = [[[NSImage alloc] initWithCGImage:cgImage size:NSZeroSize] autorelease];
QRegion clippedRegion = region;
for (QWindow *w = window; w; w = w->parent()) {
if (!w->mask().isEmpty()) {
clippedRegion &= w == window ? w->mask()
: w->mask().translated(window->mapFromGlobal(w->mapToGlobal(QPoint(0, 0))));
}
}
for (const QRect &viewLocalRect : clippedRegion) {
QPoint backingStoreOffset = viewLocalRect.topLeft() + offset;
QRect backingStoreRect(backingStoreOffset * devicePixelRatio, viewLocalRect.size() * devicePixelRatio);
if (graphicsContext.flipped) // Flip backingStoreRect to match graphics context
backingStoreRect.moveTop(m_image.height() - (backingStoreRect.y() + backingStoreRect.height()));
CGRect viewRect = viewLocalRect.toCGRect();
[backingStoreImage drawInRect:viewRect fromRect:backingStoreRect.toCGRect()
operation:compositingOperation fraction:1.0 respectFlipped:YES hints:nil];
#ifdef QT_DEBUG
if (Q_UNLIKELY(debugBackingStoreFlush)) {
[[NSColor colorWithCalibratedRed:drand48() green:drand48() blue:drand48() alpha:0.3] set];
[NSBezierPath fillRect:viewRect];
if (drawingOutsideOfDisplayCycle) {
[[[NSColor magentaColor] colorWithAlphaComponent:0.5] set];
[NSBezierPath strokeLineFromPoint:viewLocalRect.topLeft().toCGPoint()
toPoint:viewLocalRect.bottomRight().toCGPoint()];
}
}
#endif
}
// -------------------------------------------------------------------------
if (shouldHandleViewLockManually)
[view unlockFocus];
if (drawingOutsideOfDisplayCycle) {
redrawRoundedBottomCorners([view convertRect:region.boundingRect().toCGRect() toView:nil]);
[view.window flushWindow];
}
// Done flushing to NSWindow backingstore
QCocoaWindow *topLevelCocoaWindow = static_cast<QCocoaWindow *>(topLevelWindow->handle());
if (Q_UNLIKELY(topLevelCocoaWindow->m_needsInvalidateShadow)) {
qCDebug(lcQpaBackingStore) << "Invalidating window shadow for" << topLevelCocoaWindow;
[topLevelView.window invalidateShadow];
topLevelCocoaWindow->m_needsInvalidateShadow = false;
}
}
/*
When drawing outside of the display cycle, which Qt Widget does a lot,
we end up drawing over the NSThemeFrame, losing the rounded corners of
windows in the process.
To work around this, until we've enabled updates via setNeedsDisplay and/or
enabled layer-backed views, we ask the NSWindow to redraw the bottom corners
if they intersect with the flushed region.
This is the same logic used internally by e.g [NSView displayIfNeeded],
[NSRulerView _scrollToMatchContentView], and [NSClipView _immediateScrollToPoint:],
as well as the workaround used by WebKit to fix a similar bug:
https://trac.webkit.org/changeset/85376/webkit
*/
void QNSWindowBackingStore::redrawRoundedBottomCorners(CGRect windowRect) const
{
#if !defined(QT_APPLE_NO_PRIVATE_APIS)
Q_ASSERT(this->window()->handle());
NSWindow *window = static_cast<QCocoaWindow *>(this->window()->handle())->nativeWindow();
static SEL intersectBottomCornersWithRect = NSSelectorFromString(
[NSString stringWithFormat:@"_%s%s:", "intersectBottomCorners", "WithRect"]);
if (NSMethodSignature *signature = [window methodSignatureForSelector:intersectBottomCornersWithRect]) {
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
invocation.target = window;
invocation.selector = intersectBottomCornersWithRect;
[invocation setArgument:&windowRect atIndex:2];
[invocation invoke];
NSRect cornerOverlap = NSZeroRect;
[invocation getReturnValue:&cornerOverlap];
if (!NSIsEmptyRect(cornerOverlap)) {
static SEL maskRoundedBottomCorners = NSSelectorFromString(
[NSString stringWithFormat:@"_%s%s:", "maskRounded", "BottomCorners"]);
if ((signature = [window methodSignatureForSelector:maskRoundedBottomCorners])) {
invocation = [NSInvocation invocationWithMethodSignature:signature];
invocation.target = window;
invocation.selector = maskRoundedBottomCorners;
[invocation setArgument:&cornerOverlap atIndex:2];
[invocation invoke];
}
}
}
#else
Q_UNUSED(windowRect);
#endif
}
void QNSWindowBackingStore::backingPropertiesChanged()
{
m_image = QImage();
}
// ----------------------------------------------------------------------------
QCALayerBackingStore::QCALayerBackingStore(QWindow *window)
: QCocoaBackingStore(window)
{
qCDebug(lcQpaBackingStore) << "Creating QCALayerBackingStore for" << window;
m_buffers.resize(1);
}
QCALayerBackingStore::~QCALayerBackingStore()
{
}
void QCALayerBackingStore::resize(const QSize &size, const QRegion &staticContents)
{
qCDebug(lcQpaBackingStore) << "Resize requested to" << size;
if (!staticContents.isNull())
qCWarning(lcQpaBackingStore) << "QCALayerBackingStore does not support static contents";
m_requestedSize = size;
}
void QCALayerBackingStore::beginPaint(const QRegion &region)
{
Q_UNUSED(region);
QMacAutoReleasePool pool;
qCInfo(lcQpaBackingStore) << "Beginning paint of" << region << "into backingstore of" << m_requestedSize;
ensureBackBuffer(); // Find an unused back buffer, or reserve space for a new one
const bool bufferWasRecreated = recreateBackBufferIfNeeded();
m_buffers.back()->lock(QPlatformGraphicsBuffer::SWWriteAccess);
// Although undocumented, QBackingStore::beginPaint expects the painted region
// to be cleared before use if the window has a surface format with an alpha.
// Fresh IOSurfaces are already cleared, so we don't need to clear those.
if (!bufferWasRecreated && window()->format().hasAlpha()) {
qCDebug(lcQpaBackingStore) << "Clearing" << region << "before use";
QPainter painter(m_buffers.back()->asImage());
painter.setCompositionMode(QPainter::CompositionMode_Source);
for (const QRect &rect : region)
painter.fillRect(rect, Qt::transparent);
}
m_paintedRegion += region;
}
void QCALayerBackingStore::ensureBackBuffer()
{
if (window()->format().swapBehavior() == QSurfaceFormat::SingleBuffer)
return;
// The current back buffer may have been assigned to a layer in a previous flush,
// but we deferred the swap. Do it now if the surface has been picked up by CA.
if (m_buffers.back() && m_buffers.back()->isInUse() && m_buffers.back() != m_buffers.front()) {
qCInfo(lcQpaBackingStore) << "Back buffer has been picked up by CA, swapping to front";
std::swap(m_buffers.back(), m_buffers.front());
}
if (Q_UNLIKELY(lcQpaBackingStore().isDebugEnabled())) {
// ┌───────┬───────┬───────┬─────┬──────┐
// │ front ┊ spare ┊ spare ┊ ... ┊ back │
// └───────┴───────┴───────┴─────┴──────┘
for (const auto &buffer : m_buffers) {
qCDebug(lcQpaBackingStore).nospace() << " "
<< (buffer == m_buffers.front() ? "front" :
buffer == m_buffers.back() ? " back" :
"spare"
) << ": " << buffer.get();
}
}
// Ensure our back buffer is ready to draw into. If not, find a buffer that
// is not in use, or reserve space for a new buffer if none can be found.
for (auto &buffer : backwards(m_buffers)) {
if (!buffer || !buffer->isInUse()) {
// Buffer is okey to use, swap if necessary
if (buffer != m_buffers.back())
std::swap(buffer, m_buffers.back());
qCDebug(lcQpaBackingStore) << "Using back buffer" << m_buffers.back().get();
static const int kMaxSwapChainDepth = 3;
if (m_buffers.size() > kMaxSwapChainDepth) {
qCDebug(lcQpaBackingStore) << "Reducing swap chain depth to" << kMaxSwapChainDepth;
m_buffers.erase(std::next(m_buffers.begin(), 1), std::prev(m_buffers.end(), 2));
}
break;
} else if (buffer == m_buffers.front()) {
// We've exhausted the available buffers, make room for a new one
const int swapChainDepth = m_buffers.size() + 1;
qCDebug(lcQpaBackingStore) << "Available buffers exhausted, increasing swap chain depth to" << swapChainDepth;
m_buffers.resize(swapChainDepth);
break;
}
}
Q_ASSERT(!m_buffers.back() || !m_buffers.back()->isInUse());
}
// Disabled until performance issue on 5K iMac Pro has been investigated further,
// as rounding up during resize will typically result in full screen buffer sizes
// and low frame rate also for smaller window sizes.
#define USE_LAZY_BUFFER_ALLOCATION_DURING_LIVE_WINDOW_RESIZE 0
bool QCALayerBackingStore::recreateBackBufferIfNeeded()
{
const QCocoaWindow *platformWindow = static_cast<QCocoaWindow *>(window()->handle());
const qreal devicePixelRatio = platformWindow->devicePixelRatio();
QSize requestedBufferSize = m_requestedSize * devicePixelRatio;
const NSView *backingStoreView = platformWindow->view();
Q_UNUSED(backingStoreView);
auto bufferSizeMismatch = [&](const QSize requested, const QSize actual) {
#if USE_LAZY_BUFFER_ALLOCATION_DURING_LIVE_WINDOW_RESIZE
if (backingStoreView.inLiveResize) {
// Prevent over-eager buffer allocation during window resize by reusing larger buffers
return requested.width() > actual.width() || requested.height() > actual.height();
}
#endif
return requested != actual;
};
if (!m_buffers.back() || bufferSizeMismatch(requestedBufferSize, m_buffers.back()->size())) {
#if USE_LAZY_BUFFER_ALLOCATION_DURING_LIVE_WINDOW_RESIZE
if (backingStoreView.inLiveResize) {
// Prevent over-eager buffer allocation during window resize by rounding up
QSize nativeScreenSize = window()->screen()->geometry().size() * devicePixelRatio;
requestedBufferSize = QSize(qNextPowerOfTwo(requestedBufferSize.width()),
qNextPowerOfTwo(requestedBufferSize.height())).boundedTo(nativeScreenSize);
}
#endif
qCInfo(lcQpaBackingStore) << "Creating surface of" << requestedBufferSize
<< "based on requested" << m_requestedSize << "and dpr =" << devicePixelRatio;
static auto pixelFormat = QImage::toPixelFormat(QImage::Format_ARGB32_Premultiplied);
m_buffers.back().reset(new GraphicsBuffer(requestedBufferSize, devicePixelRatio, pixelFormat, colorSpace()));
return true;
}
return false;
}
QPaintDevice *QCALayerBackingStore::paintDevice()
{
Q_ASSERT(m_buffers.back());
return m_buffers.back()->asImage();
}
void QCALayerBackingStore::endPaint()
{
qCInfo(lcQpaBackingStore) << "Paint ended with painted region" << m_paintedRegion;
m_buffers.back()->unlock();
}
void QCALayerBackingStore::flush(QWindow *flushedWindow, const QRegion &region, const QPoint &offset)
{
Q_UNUSED(region);
Q_UNUSED(offset);
if (!prepareForFlush())
return;
QMacAutoReleasePool pool;
NSView *backingStoreView = static_cast<QCocoaWindow *>(window()->handle())->view();
NSView *flushedView = static_cast<QCocoaWindow *>(flushedWindow->handle())->view();
// If the backingstore is just flushed, without being painted to first, then we may
// end in a situation where the backingstore is flushed to a layer with a different
// scale factor than the one it was created for in beginPaint. This is the client's
// fault in not picking up the change in scale factor of the window and re-painting
// the backingstore accordingly. To smoothing things out, we warn about this situation,
// and change the layer's contentsScale to match the scale of the back buffer, so that
// we at least cover the whole layer. This is necessary since we set the view's
// contents placement policy to NSViewLayerContentsPlacementTopLeft, which means
// AppKit will not do any scaling on our behalf.
if (m_buffers.back()->devicePixelRatio() != flushedView.layer.contentsScale) {
qCWarning(lcQpaBackingStore) << "Back buffer dpr of" << m_buffers.back()->devicePixelRatio()
<< "doesn't match" << flushedView.layer << "contents scale of" << flushedView.layer.contentsScale
<< "- updating layer to match.";
flushedView.layer.contentsScale = m_buffers.back()->devicePixelRatio();
}
id backBufferSurface = (__bridge id)m_buffers.back()->surface();
if (flushedView.layer.contents == backBufferSurface) {
// We've managed to paint to the back buffer again before Core Animation had time
// to flush the transaction and persist the layer changes to the window server, or
// we've been asked to flush without painting anything. The layer already knows about
// the back buffer, and we don't need to re-apply it to pick up any possible surface
// changes, so bail out early.
qCInfo(lcQpaBackingStore).nospace() << "Skipping flush of " << flushedView
<< ", layer already reflects back buffer";
return;
}
// Trigger a new display cycle if there isn't one. This ensures that our layer updates
// are committed as part of a display-cycle instead of on the next runloop pass. This
// means CA won't try to throttle us if we flush too fast, and we'll coalesce our flush
// with other pending view and layer updates.
backingStoreView.window.viewsNeedDisplay = YES;
if (window()->format().swapBehavior() == QSurfaceFormat::SingleBuffer) {
// The private API [CALayer reloadValueForKeyPath:@"contents"] would be preferable,
// but barring any side effects or performance issues we opt for the hammer for now.
flushedView.layer.contents = nil;
}
qCInfo(lcQpaBackingStore) << "Flushing" << backBufferSurface
<< "to" << flushedView.layer << "of" << flushedView;
flushedView.layer.contents = backBufferSurface;
if (flushedView != backingStoreView) {
const CGSize backingStoreSize = backingStoreView.bounds.size;
flushedView.layer.contentsRect = CGRectApplyAffineTransform(
[flushedView convertRect:flushedView.bounds toView:backingStoreView],
// The contentsRect is in unit coordinate system
CGAffineTransformMakeScale(1.0 / backingStoreSize.width, 1.0 / backingStoreSize.height));
}
// Since we may receive multiple flushes before a new frame is started, we do not
// swap any buffers just yet. Instead we check in the next beginPaint if the layer's
// surface is in use, and if so swap to an unused surface as the new back buffer.
// Note: Ideally CoreAnimation would mark a surface as in use the moment we assign
// it to a layer, but as that's not the case we may end up painting to the same back
// buffer once more if we are painting faster than CA can ship the surfaces over to
// the window server.
}
#ifndef QT_NO_OPENGL
void QCALayerBackingStore::composeAndFlush(QWindow *window, const QRegion &region, const QPoint &offset,
QPlatformTextureList *textures, bool translucentBackground)
{
if (!prepareForFlush())
return;
QPlatformBackingStore::composeAndFlush(window, region, offset, textures, translucentBackground);
}
#endif
QImage QCALayerBackingStore::toImage() const
{
if (!const_cast<QCALayerBackingStore*>(this)->prepareForFlush())
return QImage();
// We need to make a copy here, as the returned image could be used just
// for reading, in which case it won't detach, and then the underlying
// image data might change under the feet of the client when we re-use
// the buffer at a later point.
m_buffers.back()->lock(QPlatformGraphicsBuffer::SWReadAccess);
QImage imageCopy = m_buffers.back()->asImage()->copy();
m_buffers.back()->unlock();
return imageCopy;
}
void QCALayerBackingStore::backingPropertiesChanged()
{
m_buffers.clear();
m_buffers.resize(1);
}
QPlatformGraphicsBuffer *QCALayerBackingStore::graphicsBuffer() const
{
return m_buffers.back().get();
}
bool QCALayerBackingStore::prepareForFlush()
{
if (!m_buffers.back()) {
qCWarning(lcQpaBackingStore) << "Tried to flush backingstore without painting to it first";
return false;
}
// Update dirty state of buffers based on what was painted. The back buffer will be
// less dirty, since we painted to it, while other buffers will become more dirty.
// This allows us to minimize copies between front and back buffers on swap in the
// cases where the painted region overlaps with the previous frame (front buffer).
for (const auto &buffer : m_buffers) {
if (buffer == m_buffers.back())
buffer->dirtyRegion -= m_paintedRegion;
else
buffer->dirtyRegion += m_paintedRegion;
}
// After painting, the back buffer is only guaranteed to have content for the painted
// region, and may still have dirty areas that need to be synced up with the front buffer,
// if we have one. We know that the front buffer is always up to date.
if (!m_buffers.back()->dirtyRegion.isEmpty() && m_buffers.front() != m_buffers.back()) {
QRegion preserveRegion = m_buffers.back()->dirtyRegion;
qCDebug(lcQpaBackingStore) << "Preserving" << preserveRegion << "from front to back buffer";
m_buffers.front()->lock(QPlatformGraphicsBuffer::SWReadAccess);
const QImage *frontBuffer = m_buffers.front()->asImage();
const QRect frontSurfaceBounds(QPoint(0, 0), m_buffers.front()->size());
const qreal sourceDevicePixelRatio = frontBuffer->devicePixelRatio();
m_buffers.back()->lock(QPlatformGraphicsBuffer::SWWriteAccess);
QPainter painter(m_buffers.back()->asImage());
painter.setCompositionMode(QPainter::CompositionMode_Source);
// Let painter operate in device pixels, to make it easier to compare coordinates
const qreal targetDevicePixelRatio = painter.device()->devicePixelRatio();
painter.scale(1.0 / targetDevicePixelRatio, 1.0 / targetDevicePixelRatio);
for (const QRect &rect : preserveRegion) {
QRect sourceRect(rect.topLeft() * sourceDevicePixelRatio, rect.size() * sourceDevicePixelRatio);
QRect targetRect(rect.topLeft() * targetDevicePixelRatio, rect.size() * targetDevicePixelRatio);
#ifdef QT_DEBUG
if (Q_UNLIKELY(!frontSurfaceBounds.contains(sourceRect.bottomRight()))) {
qCWarning(lcQpaBackingStore) << "Front buffer too small to preserve"
<< QRegion(sourceRect).subtracted(frontSurfaceBounds);
}
#endif
painter.drawImage(targetRect, *frontBuffer, sourceRect);
}
m_buffers.back()->unlock();
m_buffers.front()->unlock();
// The back buffer is now completely in sync, ready to be presented
m_buffers.back()->dirtyRegion = QRegion();
}
// Prepare for another round of painting
m_paintedRegion = QRegion();
return true;
}
// ----------------------------------------------------------------------------
QCALayerBackingStore::GraphicsBuffer::GraphicsBuffer(const QSize &size, qreal devicePixelRatio,
const QPixelFormat &format, QCFType<CGColorSpaceRef> colorSpace)
: QIOSurfaceGraphicsBuffer(size, format, colorSpace)
, dirtyRegion(0, 0, size.width() / devicePixelRatio, size.height() / devicePixelRatio)
, m_devicePixelRatio(devicePixelRatio)
{
}
QImage *QCALayerBackingStore::GraphicsBuffer::asImage()
{
if (m_image.isNull()) {
qCDebug(lcQpaBackingStore) << "Setting up paint device for" << this;
CFRetain(surface());
m_image = QImage(data(), size().width(), size().height(),
bytesPerLine(), QImage::toImageFormat(format()),
QImageCleanupFunction(CFRelease), surface());
m_image.setDevicePixelRatio(m_devicePixelRatio);
}
Q_ASSERT_X(m_image.constBits() == data(), "QCALayerBackingStore",
"IOSurfaces should have have a fixed location in memory once created");
return &m_image;
}
QT_END_NAMESPACE

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5.13.2/qtbase/src/widgets/kernel/qwidgetbackingstore.cpp
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