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* Fix rendering of intersecting quadsJüri Valdmann2017-09-191-7/+129
| | | | | | | | | | | Split intersecting quads using a BSP tree in the same manner as Chromium's rendering algorithm. Note that these split quads still will not be correctly rendered in software mode as Qt Quick's software renderer is not at all aware of non-rectangular QSGClipNodes. Task-number: QTBUG-62112 Change-Id: Ibfb72b9220817baebf828bc6183af7bd9c25d050 Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
* Extract DrawQuad handling from DelegatedFrameNode::commitJüri Valdmann2017-09-181-135/+134
| | | | | | | | Refactoring only, no algorithmic changes. Task-number: QTBUG-62112 Change-Id: I871105ea48cd513e03b957d7daa9fe095c952a52 Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
* Fix upside down rendering of render-passes in software modeAllan Sandfeld Jensen2017-08-281-0/+1
| | | | | | | | | The software backend version of QSGLayer defaults to not mirroring vertically, where the OpenGL does, and we rely on that. Task-number: QTBUG-62112 Change-Id: Id5368728fd7046d2e4dc35bd4b2b61f2db35dac6 Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
* Fix backwards compatibilityAllan Sandfeld Jensen2017-05-101-0/+9
| | | | | | | | | | QtWebEngine supports building with last stable and last LTS Qt releases. Guard some 5.7-5.9 API from being used when not available, and reinstate the default features for 5.6 LTS builds. Change-Id: Ia288a49109d011a2bee883d4a2d38d994b497d59 Reviewed-by: Michael Brüning <michael.bruning@qt.io>
* Fix undeclared use of QSGFlatColorMaterial when QT_NO_OPENGL is definedJüri Valdmann2017-04-261-4/+4
| | | | | | | | | | | QtWebEngine fails to build with -no-opengl due to src/core/delegated_frame_node.cpp trying to use QSGFlatColorMaterial without including the header. Change-Id: I98c12d3c482f7cacb2f61dd13ae32ee0a5740ae2 Reviewed-by: Michael Brüning <michael.bruning@qt.io>
* Standardize override declarationAllan Sandfeld Jensen2017-04-211-20/+21
| | | | | | | | Update our overrides to Qt coding standard getting rid of Q_DECL_OVERRIDE and redundant virtual declarations. Change-Id: Id8b0750eb05c51fc8f50cac4000a811eebcbf918 Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
* Handle texture nodes alternative source rectAllan Sandfeld Jensen2017-03-221-8/+18
| | | | | | | | | | Texture nodes has an alternative and rarely used way of setting source rect using uv_top_left and uv_bottom_right. This patch adds support for it. Task-number: QTBUG-59407 Change-Id: Ic14c3dbdede6ece07eb3cda2dcfea8e860654ef2 Reviewed-by: Michael Brüning <michael.bruning@qt.io>
* Simple adaptations to Chromium 55Allan Sandfeld Jensen2017-03-011-4/+7
| | | | | | | The simplest adaptations to API and build changes in Chromium 55 Change-Id: I923fa188690a04902492317807f72f006bcab9c6 Reviewed-by: Michal Klocek <michal.klocek@qt.io>
* Fix crashes in removeFromCanvasMichael Brüning2017-02-151-7/+19
| | | | | | | | | | | | | After reparenting the view, the compositor data may still be the same, but the node might be a different one. Check if the list of scene graph nodes is empty when making the decision on whether to build a new node tree or not. Also advance the node iterator for missing render passes. Task-number: QTBUG-58472 Change-Id: I28dfb40bda89470c7cdaec0aef8a976e307f5b6a Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io> Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
* Merge remote-tracking branch 'origin/5.8' into 5.9Allan Sandfeld Jensen2017-02-081-1/+1
|\ | | | | | | Change-Id: I0c3654ad097809fe10bcc6a15827a0af3006c4e6
| * Avoid crash in desktop linux with --disable-gpuAllan Sandfeld Jensen2017-02-011-1/+1
| | | | | | | | | | | | | | Don't try to access null OpenGL contexts. Change-Id: I7d0e607e8d29d3cfba8d6e98cd142b951c960281 Reviewed-by: Michal Klocek <michal.klocek@qt.io>
* | Optimize scene graph rendering by reusing old nodes if possibleMichael Brüning2017-01-111-98/+434
|/ | | | | | | | | | | | | | | | | | | | | | | Previously, Qt WebEngine always dropped all existing scene graph nodes that were created for previous frames and built up a whole new tree. The main reason for this was that the render pass structure is not guaranteed to remain the same across two frames. This resulted in a full repaint of every new frame, even if only a small area had changed. We now check first if the structure of the frame data has changed across two sequential frames. We only discard the old nodes if there actually has been a change. Otherwise, we reuse the scene graph nodes and only update the nodes that have changed. A general exception to this at the moment is video. In case any streaming video or yuv video nodes are found in the render pass, all nodes get recreated. Task-number: QTBUG-57720 Change-Id: I8998577af48a163d54144f205c316ee427ed0307 Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io> Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
* Build with Qt 5.6Allan Sandfeld Jensen2016-11-171-1/+5
| | | | | | | Make minimal changes so QtWebEngineCore 5.8 still builds with Qt LTR. Change-Id: Iae3ae606b3457a6ca311ae174b3d2a331e9b20bc Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
* Fix building when QT_NO_OPENGL is definedAndy Nichols2016-10-021-13/+46
| | | | | | | Task-number: QTBUG-54327 Change-Id: I759598d56aa0a74b64092365b422a743fb508ac6 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
* Merge remote-tracking branch 'origin/5.7' into 5.8Liang Qi2016-09-211-20/+63
|\ | | | | | | | | | | | | | | | | Conflicts: src/3rdparty src/core/delegated_frame_node.h src/webengine/api/qquickwebenginecontextmenudata.cpp Change-Id: I163488d0d32cd981351608b2886f12e547e24672
| * Merge remote-tracking branch 'origin/5.6' into 5.7Michal Klocek2016-08-311-20/+63
| |\ | | | | | | | | | Change-Id: Ic739ab9db0851cc13467168840ea2549996432f8
| | * Fix textures memory leak on second X11 screenMichal Klocek2016-08-241-20/+62
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fix for QTBUG-48969 was only half-baked patch and introduced massive memory leak on fbo and texture alloctaions. Delete fbo and extra allocated textures. Task-number: QTBUG-52575 Task-number: QTBUG-48969 Change-Id: I2148f37cd27dab9e40ab72caeb6857752b69379f Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
* | | Adaptations to Chromium 53Allan Sandfeld Jensen2016-09-141-14/+14
| | | | | | | | | | | | | | | Change-Id: I15053486edfd42ee607250b4f14fb6eaa325c959 Reviewed-by: Michael Brüning <michael.bruning@qt.io>
* | | Adaptations to Chromium 52Allan Sandfeld Jensen2016-09-141-19/+6
| | | | | | | | | | | | | | | Change-Id: Idf8a511ba26d263fd9d014d87d5e1101d706da71 Reviewed-by: Michael Brüning <michael.bruning@qt.io>
* | | Merge remote-tracking branch 'origin/5.7' into devLiang Qi2016-08-161-1/+1
|\| | | | | | | | | | | Change-Id: Id5f97771be23a4393e8d3be98903c321377ae809
| * | Check if gpu fence is supported in pullTextureMichal Klocek2016-08-091-1/+1
| | | | | | | | | | | | | | | | | | Task-number: QTBUG-53972 Change-Id: Ie722e40e4763c5a78ce566d03fec6877d64b2023 Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
* | | Switch away from deprecated QSG*Node classesAllan Sandfeld Jensen2016-07-141-7/+14
| | | | | | | | | | | | | | | | | | | | | | | | Use the new public QSG classes meant to replace QSGSimpleRectNode and QSGSimpleTextureNode. Change-Id: Icdfc3b4ba13dd28258defa955d050927abbae95b Reviewed-by: Michael Brüning <michael.bruning@qt.io>
* | | Fix build with newer qtdeclarativeAllan Sandfeld Jensen2016-06-271-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | What was previous called QSGImageNode is now QSGInternalImageNode Task-number: QTBUG-54312 Change-Id: Iec286765bea5598d86932c81bfd122461a2e9884 Reviewed-by: Liang Qi <liang.qi@qt.io> Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
* | | Handle new resource offset and multiplier in YUV video nodesAllan Sandfeld Jensen2016-06-011-2/+4
|/ / | | | | | | | | | | | | | | Handles new properties added to YUV nodes to handle 9- and 10-bit per color channel videos. Change-Id: If96660995650d3deeda7601714146fafeef57176 Reviewed-by: Michael Brüning <michael.bruning@theqtcompany.com>
* | Update GL mailbox synchronization to Chromium 49v5.7.0-alpha1Allan Sandfeld Jensen2016-03-071-112/+119
| | | | | | | | | | | | | | | | | | | | | | Chromium 49 switched to using SyncToken, making our old model based on sync-points obsolete. This patch rewrites our syncing to instead take advantage of new Chromium API for waiting on sync tokens. It also moves the creation of the GLFences we use out of Chromium. Task-number: QTBUG-51173 Change-Id: I04d726d4bc81bf6b7fe39bb2b5507e84a0b6991e Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>
* | Merge remote-tracking branch 'origin/5.6' into 5.7Allan Sandfeld Jensen2016-02-201-6/+65
|\| | | | | | | Change-Id: If884b8b8bc087a6a726476b49cdb48a0efaa173e
| * Do slow copy of mailbox textures when contexts are not sharedMichal Klocek2016-02-161-6/+65
| | | | | | | | | | | | | | | | | | | | In case of two individual screens on X11 qt global shared context is not shared. Copy the textures between contexts using FBO and system memory. Task-number: QTBUG-48969 Change-Id: I07d9d5e27917fd63064215b4eb1d0b134065bd43 Reviewed-by: Allan Sandfeld Jensen <allan.jensen@theqtcompany.com>
* | Unify license header usage.Jani Heikkinen2016-02-011-11/+14
| | | | | | | | | | | | | | | | | | Update files using old header.LGPL3 to use header.LGPL Update files using old header.FLD to use new header.FDL Update files using old header.BSD to use new header.BSD Change-Id: I36a67aaa8c3ca6c7946308defc9c03c3571a7d23 Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>
* | Merge branch '5.6' into devAllan Sandfeld Jensen2015-11-201-3/+24
|\| | | | | | | Change-Id: I05fe27b8321944cf68cc96dfa9dfcaeb54c8c8cd
| * Replace QList with QVectorKai Koehne2015-11-061-1/+1
| | | | | | | | | | | | | | | | Replace QList with QVector in all places where the type isn't a pointer, and is not already (indirectly) exposed through public API. Change-Id: I90e3db56bf9ebda6b3cb8fb4396d2ae283159727 Reviewed-by: Allan Sandfeld Jensen <allan.jensen@theqtcompany.com>
| * Support IOSurface framesAllan Sandfeld Jensen2015-10-281-2/+23
| | | | | | | | | | | | | | | | | | | | Support getting video as IOSurface frames on OS X. With Chromium 45 we only get IOSurface frame when using non-default command-line flags. Change-Id: Ibf5226db53fa6fb51112bec9061d701918798ddd Reviewed-by: Michael Brüning <michael.bruning@theqtcompany.com>
* | Adapting to Chromium 47Allan Sandfeld Jensen2015-10-271-10/+1
|/ | | | | | | Updating to Chromium 47 and adapting API. Change-Id: Id465bbcd4facd7c47cb8a9f4bd4e18cbdc0d1120 Reviewed-by: Michael Brüning <michael.bruning@theqtcompany.com>
* Rebasing on Chromium 45Allan Sandfeld Jensen2015-08-251-10/+10
| | | | | | | Fixing the minor differences needed to work with Chromium 45. Change-Id: I5036b4b9a069d45e8dd37e24fab84cdfe5e67acc Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>
* Fix build with only OpenGL/ES2Allan Sandfeld Jensen2015-07-061-0/+4
| | | | | | | | Define the needed extension when not available at compile time. Change-Id: I93be828facb2d2e3bf16ac98c04ef3544d695675 Reviewed-by: Pierre Rossi <pierre.rossi@theqtcompany.com> Reviewed-by: Andras Becsi <andras.becsi@theqtcompany.com>
* Fix video output with Chromium 44Allan Sandfeld Jensen2015-07-011-1/+17
| | | | | | | | | Updates shaders and rendering logic to match the new similar logic from Chromium. This includes separate UV and YA channels and different YUV color spaces. Change-Id: I677ec5477207a00d259d69989be6b8737803221d Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
* Fix Chromium 44 on OpenGL ES3Allan Sandfeld Jensen2015-06-231-4/+0
| | | | | | | | | | Chromium will now use the sync extension on OpenGL ES3, this means we shouldn't check for DesktopGL specific define, and since we do not use anything directly from the extension we don't need the ifdef. Change-Id: If664a885042c216079f1c58c8e6245b1c5447c9e Reviewed-by: Andras Becsi <andras.becsi@theqtcompany.com> Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
* Trivial changes for Chromium 44Allan Sandfeld Jensen2015-06-231-2/+2
| | | | | Change-Id: I8261b201f1d6623eff3427b68b8d098c17d293d3 Reviewed-by: Andras Becsi <andras.becsi@theqtcompany.com>
* Add namespace to internal QtWebEngine APIAllan Sandfeld Jensen2015-03-021-0/+3
| | | | | | | | Adds the QtWebEngineCore namespace to all internal core API. This ensures we don't export any internal symbols in the global namespace. Change-Id: I26af888ea7c6c4c4d0f04c24a377c1a9d3c92751 Reviewed-by: Andras Becsi <andras.becsi@theqtcompany.com>
* Update copyright headersJani Heikkinen2015-02-161-7/+7
| | | | | | | | | Qt copyrights are now in The Qt Company, so we could update the source code headers accordingly. In the same go we should also fix the links to point to qt.io. Change-Id: Ieb6bac7a1be5c25eb7cb917495b58b6a870ca6d4 Reviewed-by: Pierre Rossi <pierre.rossi@theqtcompany.com>
* Update Chromium to version 40.0.2214.28 and ninja to 1.5.3.Zeno Albisser2015-01-201-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * scoped_refptr operator for implicit conversion to pointer has been disabled upstream: https://codereview.chromium.org/510323002 * Group permission API as done upstream: https://codereview.chromium.org/622793002 * content_worker gyp target has been removed upstream. * GetPageThumbnailData moved to DevToolsManagerDelegate. * ui/ui_resources has been renamed to ui/resources * WebPreferences and ResourceType have moved inside content. * Merge ResourceBundle's InitSharedInstanceLocaleOnly with InitSharedInstanceWithLocale(): https://codereview.chromium.org/457103003 * Remove obsolete accessibility events. * AX_EVENT_SELECTED_TEXT_CHANGED has been renamed to AX_EVENT_TEXT_SELECTION_CHANGED * AX_ROLE_MATH_ELEMENT was removed upstream. https://codereview.chromium.org/695133002 * Screen::IsDIPEnabled has been removed upstream. https://codereview.chromium.org/672823002 * Update DevToolsHttpHandlerDelegateQt according to ShellDevToolsManagerDelegate. * Various functionality from DevToolsHttpHandler was moved to DevToolsManagerDelegate https://codereview.chromium.org/560323005 * DevToolsHttpHandler::Start expects a scoped_ptr now. * Make sure event_factory_evdev.h is not included when USE_OZONE is not defined * ErrorPageParams was moved into namespace error_page. * Media Access is now handled by ContentBrowserClient::CheckMediaAccessPermission * SpecialStoragePolicy moved to namespace storage * Add implementation for new pure virtual function BrowserContext::GetSSLHostStateDelegate. * RenderPass::Id was renamed to RenderPass::RenderPassId * Include view_messages.h for ViewHostMsg_TextInputState_Param * CERT_UNABLE_TO_CHECK_REVOCATION has been deprecated by Chromium: https://codereview.chromium.org/449743002 * MailboxManager::ConsumeTexture only takes the mailbox as an argument * Replace RWHVQt::TextInputStateChanged with RWHVQt::TextInputTypeChanged. * RenderWidgetHostView::ScrollOffsetChanged has been removed. * SkBitmap::Config was removed upstream. * CopyFromCompositingSurfaceCallback has become an own type. * AcceleratedSurfaceInitialized only takes route_id as an argument. * ServerBoundCertService has been renamed to ChannelIDService. Related API has been renamed accordingly. * TextureImageTransportSurface was removed upstream. * Update MediaCaptureDispatcher::OnMediaRequestStateChanged signature. * AudioStream related functions are gone upstream. https://codereview.chromium.org/569713002 * Add implementation for RenderWidgetHostViewQt::GetLastScrollOffset. * Include generic touch_device implementation. * switches::kDisableDesktopNotifications was removed upstream. https://codereview.chromium.org/607843002 * PageTransition moved to ui. * Messages headers are not guarded. Including them multiple times does hurt. * ScaleGestureDetector does not create a standalone GestureDetector anymore. https://codereview.chromium.org/501503003 * MotionEvent::Cancel and Clone are not virtual anymore. https://codereview.chromium.org/502993004 * Exclude os_exchange_data_provider_mac from build. * Remove argument from ScopedClipboardWriter ctor. https://codereview.chromium.org/558913003 * Remove ShowPopupMenu override from WebContentsQt. The function is not pure virtual anymore, and we never implemented any specifics. * Do not use clang on desktop linux. * Request functions in ContentBrowserClient were merged into RequestPermission. * ninja: use configure.py --bootstrap instead of bootstrap.py Change-Id: I3575612826db7845461a949b4e737264bb4e8d88 Reviewed-by: Pierre Rossi <pierre.rossi@theqtcompany.com>
* Merge remote-tracking branch 'origin/5.4' into devFrederik Gladhorn2015-01-021-2/+2
|\ | | | | | | | | | | | | | | | | | | Conflicts: .qmake.conf src/3rdparty src/core/content_browser_client_qt.h src/core/core_module.pro Change-Id: Ia05a6564a4d17ca14ff9b76ae018c3f4ef33d535
| * Check for EGL_KHR_fence_sync instead of EGL_KHR_reusable_syncAndras Becsi2014-12-081-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | We create an EGL_KHR_fence_sync on the chromium thread but try to verify if the wait function implementation is available by testing for the EGL_KHR_reusable_sync extension in the scene graph thread. Since the latter extension is not supported by most of our devices, we never actually waited for the rendering to finish. Change-Id: Ied829d4035d42899cfb3f86de018bc48e61c0cc0 Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>
* | Don't use Q_FOREACH on QHash::valuesJocelyn Turcotte2014-11-251-5/+10
| | | | | | | | | | | | | | | | | | QHash::values will copy all values into a new QList, increasing the ref-count of all stored QSharedPointer temporarily. Use the QHash iterators directly to avoid this. Change-Id: I49b1af24b706da195dc4df7206133f039198aad7 Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>
* | Support TransferableResource::is_softwareJocelyn Turcotte2014-11-251-24/+50
| | | | | | | | | | | | | | | | | | | | | | | | | | | | When the GPU process fails to initialize, or when the --disable-gpu switch is provided, the delegating renderer will transfer resource mailboxes through shared memory pixel data instead of through shared texture IDs in the GPU process. Handle this by uploading the pixel data ourselves with createTextureFromImage, also allowing us to render tiles in the QtQuick 2D Renderer. Change-Id: I70ad7122cd0e52dd5ab435ae01e7f032b8e1194e Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
* | Extract the resource logic out of MailboxTextureJocelyn Turcotte2014-11-251-66/+85
| | | | | | | | | | | | | | | | | | | | | | | | | | As a first step to allow using plain textures for software resources, split the Chromium resource handling responsibility into a ResourceHolder class. This also moves the static findMailboxTexture into a member DelegatedFrameNode::findAndHoldResource in preparation for how texture refcounting will work in the following patch. Change-Id: Iaa64273c187af022045bbcaa956fcaa1f3defabc Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
* | Avoid relying on QOpenGL classes to handle RenderPassesJocelyn Turcotte2014-11-251-107/+51
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use QSGLayer and get rid of RenderPassTexture so that we can render intermediate layers with the QtQuick 2D Renderer. This reintroduces the private dependency on QtQuick since the QSGLayer factory methods aren't available publically, and also that we need to use QSGImageNode instead of QSGSimpleTextureNode to use them. Since we can't subclass QSGLayer to hold a reference to SG objects directly in the nodes that use them, store them all in the wrapping DelegatedFrameNode in a SGObjects structs. This works assuming that the DelegatedFrameNode will always be at the root of our nodes, layers and textures; if the scene graph destroys the DelegatedFrameNode all child nodes will be destroyed with it. Change-Id: Iedeceb8f98eb54fd8228a677c366d6df9a270e11 Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
* | Don't rely on quads to set the texture sizeJocelyn Turcotte2014-11-251-3/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | What really matters with texture coordinates is the normalized 0-1 coordinate that will end up on vertex attributes. By default QSGSimpleTextureNode will use the full texture size to calculate those coordinates. In that case any texture size will end up with the same (0,0)-(1,1) coordinates, so we don't really need to set the actual texel size of the texture. So instead of relying on dependent quads to come back and set the size on the texture, do like the Chromium compositor does and just make sure that the full normalized texture rect is set on vertices if no texture size was provided on the resource. Since the scene graph doesn't achieve this behavior by default with an empty texture size, set a 1x1 size to get it to do what we want. Change-Id: I48751d2c2f6ea82dcb4bec9e984b64f7e77316f6 Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
* | Use the new QSGSimpleTextureNode::sourceRectJocelyn Turcotte2014-11-251-4/+1
| | | | | | | | | | | | | | This is cleaner than hacking the QSGGeometry data ourselves. Change-Id: Id2009ac8c6237472e56a11d6daa589e94bf10945 Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
* | Rename DelegatedFrameNodeData to ChromiumCompositorDataJocelyn Turcotte2014-11-251-13/+13
| | | | | | | | | | | | | | | | | | | | | | | | This clarifies that those objects span to the lifetime of a Chromium frame rather than to the DelegatedFrameNode, which can be destroyed by the scene graph when the window is unmapped. The also avoids the confusion with the DelegatedFrameData Chromium structure name. Change-Id: Ibbeb2b10ef18704fc0934e285cca4ead23879646 Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
* | Add support for DebugBorderDrawQuadPierre Rossi2014-10-131-0/+25
|/ | | | | | | | This can be useful for debugging in conjunction with the --show-composited-layer-borders command line switch. Change-Id: Iade97f935c26e11f74552f7018770b968a31daf1 Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>