QtWebEngine

@JonB
Yes, the build is compiled for release and optimized. We aren't seeing agonizingly slow performance, just areas where processing stalls at times.

We are still investigating the application logic itself, but I am just doing some due diligence here in case there are some QT WebEngine optimizations (given the performance comparisons) that can be made.

Let me take the opportunity to provide some build details I omitted:

Platform: MacOS
QT Version: 5.15.17 (Release build)

it's resolve on debian 11,the problem repeat on debian 12

Just in case you stumble onto this issue, the Qt Documentation now contains instructions

cf https://doc.qt.io/qt-6/qtwebengine-deploying.html#macos-specific-deployment-steps

Here is the content of the QtWebEngineCore.framework/Helpers/QtWebEngineProcess.app/Contents/Resources/QtWebEngineProcess.entitlements for reference, for my macos install, v 6.5.2

$ cat /Users/julien/Qt/6.5.2/macos/lib/QtWebEngineCore.framework/Versions/A/Helpers/QtWebEngineProcess.app/Contents/Resources/QtWebEngineProcess.entitlements <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>com.apple.security.cs.allow-unsigned-executable-memory</key> <true/> <key>com.apple.security.cs.disable-library-validation</key> <true/> <key>com.apple.security.cs.allow-jit</key> <true/> <key>com.apple.security.cs.disable-executable-page-protection</key> <true/> </dict> </plist>

@lille said in buildroot for qt 5.15.2 compile!:

Be sure must install libharfbuzz-dev package in host developer?

No. If you're cross compiling then all needed libraries/headers have to be in your sysroot.

@emircanacardev said in QtWebEngine and JS Integration:

WebEngineScriptCollection is not support the qt 5.x i think. Am i right.

Qt 5.15 didn't have WebEngineScriptCollection, but it still has a list of user scripts: https://doc.qt.io/qt-5/qml-qtwebengine-webengineview.html#userScripts-prop

// script.js document.body.style.background = "#00aaaa" // *.qml in Qt 5.15 WebEngineView { id: webView anchors.fill: parent url: "chrome://gpu" WebEngineScript { id: script sourceUrl: Qt.resolvedUrl("scripts.js") } Component.onCompleted: webView.userScripts.push(script) } // *.qml in Qt 6.7 WebEngineView { id: webView anchors.fill: parent url: "chrome://gpu" Component.onCompleted: { let script = WebEngine.script() script.sourceUrl = Qt.resolvedUrl("scripts.js") webView.userScripts.insert(script) } }

when I resize the qwebengineview,the errors came out.I guess maybe it was caused by the chorum ui threads.
cause When I resized the qwebengineview very quickly then the program crashed.heres the detail information.

by the way.are there any ways that could resize the qwebengineview normally?

code_text

[opengl\qopenglframebufferobject.cpp line 570] OpenGL Error: 1281
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete, missing attachment.
[opengl\qopenglframebufferobject.cpp line 802] OpenGL Error: 1281
[opengl\qopenglframebufferobject.cpp line 570] OpenGL Error: 1281
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete, missing attachment.
[opengl\qopenglframebufferobject.cpp line 802] OpenGL Error: 1281
[7,484:6,388:0827/213650.756:ERROR:gles2_cmd_decoder.cc(5,678)] GLES2DecoderImpl::ResizeOffscreenFramebuffer failed to allocate storage due to excessive dimensions.
[7,484:6,388:0827/213650.756:ERROR:gles2_cmd_decoder.cc(5,678)] GLES2DecoderImpl::ResizeOffscreenFramebuffer failed to allocate storage due to excessive dimensions.
[7,484:6,388:0827/213650.756:ERROR:gles2_cmd_decoder.cc(5,827)] GLES2DecoderImpl: Context lost because ResizeOffscreenFramebuffer failed.
[7,484:6,388:0827/213650.757:ERROR:gles2_cmd_decoder.cc(5,963)] Error: 5 for Command kResizeCHROMIUM
[7,484:6,388:0827/213650.757:ERROR:in_process_command_buffer.cc(375)] MakeCurrent failed because context lost.
[7,484:6,388:0827/213650.756:ERROR:gles2_cmd_decoder.cc(5,827)] GLES2DecoderImpl: Context lost because ResizeOffscreenFramebuffer failed.
[7,484:6,388:0827/213650.757:ERROR:gles2_cmd_decoder.cc(5,963)] Error: 5 for Command kResizeCHROMIUM
[7,484:6,388:0827/213650.757:ERROR:in_process_command_buffer.cc(375)] MakeCurrent failed because context lost.
[7,484:6,388:0827/213650.766:ERROR:in_process_command_buffer.cc(375)] MakeCurrent failed because context lost.
[7,484:6,388:0827/213650.766:ERROR:in_process_command_buffer.cc(375)] MakeCurrent failed because context lost.
[7,484:6,388:0827/213650.852:ERROR:gles2_cmd_decoder.cc(5,678)] GLES2DecoderImpl::ResizeOffscreenFramebuffer failed to allocate storage due to excessive dimensions.
[7,484:6,388:0827/213650.852:ERROR:gles2_cmd_decoder.cc(5,827)] GLES2DecoderImpl: Context lost because ResizeOffscreenFramebuffer failed.
[7,484:6,388:0827/213650.852:ERROR:gles2_cmd_decoder.cc(5,678)] GLES2DecoderImpl::ResizeOffscreenFramebuffer failed to allocate storage due to excessive dimensions.
[7,484:6,388:0827/213650.852:ERROR:gles2_cmd_decoder.cc(5,963)] Error: 5 for Command kResizeCHROMIUM
[7,484:7,364:0827/213650.852:ERROR:program_binding.cc(257)] Error compiling shader:
shader program: #define TexCoordPrecision highp
attribute float a_index;
attribute TexCoordPrecision vec4 a_position;
uniform TexCoordPrecision vec2 quad[4];
uniform mat4 matrix;
void main() {
// Compute indices for uniform arrays.
int vertex_index = int(a_index);

// Compute the position.
vec4 pos = vec4(quad[vertex_index], a_position.z, a_position.w);
gl_Position = matrix * pos;
}

[7,484:6,388:0827/213650.852:ERROR:gles2_cmd_decoder.cc(5,827)] GLES2DecoderImpl: Context lost because ResizeOffscreenFramebuffer failed.
[7,484:6,388:0827/213650.852:ERROR:gles2_cmd_decoder.cc(5,963)] Error: 5 for Command kResizeCHROMIUM
[7,484:7,364:0827/213650.852:ERROR:program_binding.cc(257)] Error compiling shader:
shader program: #define TexCoordPrecision highp
attribute float a_index;
attribute TexCoordPrecision vec4 a_position;
uniform TexCoordPrecision vec2 quad[4];
uniform mat4 matrix;
void main() {
// Compute indices for uniform arrays.
int vertex_index = int(a_index);

// Compute the position.
vec4 pos = vec4(quad[vertex_index], a_position.z, a_position.w);
gl_Position = matrix * pos;
}

[7,484:7,364:0827/213650.852:FATAL:program_binding.h(453)] Check failed: IsContextLost(context_provider->ContextGL()).
Backtrace:
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,2B3,345+820,181]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,2C5,644+894,676]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,2C5,6DC+894,828]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,1F7,046+49,366]
GetHandleVerifier [0x55,67A,44E+20,479,374]
GetHandleVerifier [0x55,67A,233+20,478,835]
GetHandleVerifier [0x55,67D,7DD+20,492,573]
GetHandleVerifier [0x55,674,E75+20,457,397]
GetHandleVerifier [0x55,672,8B5+20,447,733]
GetHandleVerifier [0x55,662,A4D+20,382,605]
GetHandleVerifier [0x55,662,B49+20,382,857]
GetHandleVerifier [0x55,662,3B7+20,380,919]
GetHandleVerifier [0x55,63A,DDE+20,219,678]
GetHandleVerifier [0x55,635,479+20,196,793]
GetHandleVerifier [0x55,634,8E8+20,193,832]
GetHandleVerifier [0x55,635,70A+20,197,450]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,814,773+1,925,219]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,814,7B9+1,925,289]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,81E,C44+1,967,412]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,825,AB4+1,995,684]
QtWebEngineCore::WebEngineSettings::setWebContentsAdapter [0x51,521,165+3,173]
TargetNtUnmapViewOfSection [0x53,F12,EB5+26,061,381]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,68D,3C0+322,736]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,68D,6B5+323,493]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,68D,B44+324,660]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,68F,606+331,510]
QtWebEngineCore::WebEngineSettings::setWebContentsAdapter [0x51,521,165+3,173]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,20F,5C1+149,073]
GetHandleVerifier [0x54,302,B4F+66,703]
GetHandleVerifier [0x54,302,486+64,966]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,2CD,44B+926,939]
GetHandleVerifier [0x54,303,31C+68,700]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,23C,4DB+333,163]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,23C,294+332,580]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,243,102+360,850]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,243,C0C+363,676]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,200,49C+87,340]
BaseThreadInitThunk [0x75,957,D69+25]
RtlInitializeExceptionChain [0x76,F2B,B9B+107]
RtlClearBits [0x76,F2B,B1F+191]
Task trace:
Backtrace:
GetHandleVerifier [0x55,636,56B+20,201,131]
GetHandleVerifier [0x54,737,E49+4,478,857]
GetHandleVerifier [0x55,547,CA7+19,224,039]
GetHandleVerifier [0x57,B25,FEB+58,931,499]
GetHandleVerifier [0x55,4F9,72B+18,903,147]
IPC message handler context: 0x85F9598B

[7,484:7,364:0827/213650.852:FATAL:program_binding.h(453)] Check failed: IsContextLost(context_provider->ContextGL()).
Backtrace:
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,2B3,345+820,181]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,2C5,644+894,676]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,2C5,6DC+894,828]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,1F7,046+49,366]
GetHandleVerifier [0x55,67A,44E+20,479,374]
GetHandleVerifier [0x55,67A,233+20,478,835]
GetHandleVerifier [0x55,67D,7DD+20,492,573]
GetHandleVerifier [0x55,674,E75+20,457,397]
GetHandleVerifier [0x55,672,8B5+20,447,733]
GetHandleVerifier [0x55,662,A4D+20,382,605]
GetHandleVerifier [0x55,662,B49+20,382,857]
GetHandleVerifier [0x55,662,3B7+20,380,919]
GetHandleVerifier [0x55,63A,DDE+20,219,678]
GetHandleVerifier [0x55,635,479+20,196,793]
GetHandleVerifier [0x55,634,8E8+20,193,832]
GetHandleVerifier [0x55,635,70A+20,197,450]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,814,773+1,925,219]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,814,7B9+1,925,289]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,81E,C44+1,967,412]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,825,AB4+1,995,684]
QtWebEngineCore::WebEngineSettings::setWebContentsAdapter [0x51,521,165+3,173]
TargetNtUnmapViewOfSection [0x53,F12,EB5+26,061,381]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,68D,3C0+322,736]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,68D,6B5+323,493]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,68D,B44+324,660]
QtWebEngineCore::JavaScriptDialogController::qt_static_metacall [0x51,68F,606+331,510]
QtWebEngineCore::WebEngineSettings::setWebContentsAdapter [0x51,521,165+3,173]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,20F,5C1+149,073]
GetHandleVerifier [0x54,302,B4F+66,703]
GetHandleVerifier [0x54,302,486+64,966]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,2CD,44B+926,939]
GetHandleVerifier [0x54,303,31C+68,700]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,23C,4DB+333,163]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,23C,294+332,580]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,243,102+360,850]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,243,C0C+363,676]
QWebEngineUrlSchemeHandler::qt_static_metacall [0x54,200,49C+87,340]
BaseThreadInitThunk [0x75,957,D69+25]
RtlInitializeExceptionChain [0x76,F2B,B9B+107]
RtlClearBits [0x76,F2B,B1F+191]
Task trace:
Backtrace:
GetHandleVerifier [0x55,636,56B+20,201,131]
GetHandleVerifier [0x54,737,E49+4,478,857]
GetHandleVerifier [0x55,547,CA7+19,224,039]
GetHandleVerifier [0x57,B25,FEB+58,931,499]
GetHandleVerifier [0x55,4F9,72B+18,903,147]
IPC message handler context: 0x85F9598B

self.showMaximized()Put it in front，
Because the initial window is small, flickering is when the window suddenly maximizes
from PyQt6.QtCore import QUrl
from PyQt6.QtWebEngineWidgets import QWebEngineView
from PyQt6.QtWidgets import QApplication, QMainWindow, QWidget, QVBoxLayout

class MainWindow(QMainWindow):
def init(self):
super().init()
self.showMaximized()
wgt_main = QWidget()
self.layout_main = QVBoxLayout()
wgt_main.setLayout(self.layout_main)
self.setCentralWidget(wgt_main)

self.wbv_main = QWebEngineView() self.wbv_main.load(QUrl("https://threejs.org/examples/#webgl_animation_keyframes")) self.wbv_main.show() self.layout_main.addWidget(self.wbv_main)

if name == "main":
# Start QT app
app = QApplication(sys.argv)

window = MainWindow() window.show() app.exec()

and if I set the source file whit the setHtml() function.
it is hard to get the real height and width if the source was made by the txt.

Do you have a solution for that problem? I need.

I dont get errors when i use gold linker but website’s dont load , i get blank screen.

hi！did you solve the problem, i met the same problem.

It's not related to Debug or Release. The error is caused by line endings. The parser expects unix instead of dos line endings.

Hi,

You can build the latest Qt 5.15 for your project and if it works better. If so backport the changes.

Hi,

You should move to PySide6. Support for OpenSSL 3 started with Qt 6. Even if the support is back-ported to 5.15, you would need to build PySide2 yourself with the corresponding version of Qt 5.

@CompSciDude
I tried -no-webengine-jumbo-build when building Qt 6.7.2, still cannot build cause by out of memory (12 G RAM). Neither --webengine-jumbo-build=<number>

Found the problem, I'm replying if someone else got the same problem.
I needed to put this line of code :

os.environ["QTWEBENGINE_CHROMIUM_FLAGS"] = "--no-sandbox"

And to use sys.argv when initializing the app :

App = Qt.QApplication(sys.argv)

The final code being the following :

import PyQt5.QtWidgets as Qt from PyQt5 import QtCore import PyQt5.QtWebEngineWidgets as QtWeb import sys import os class WebView(Qt.QMainWindow): def __init__(self): super().__init__() self.setWindowTitle("Web View") self.setGeometry(100, 100, 800, 600) self.webview = QtWeb.QWebEngineView(self) self.setCentralWidget(self.webview) self.webview.load(QtCore.QUrl("https://www.google.com")) if __name__ == "__main__": os.environ["QTWEBENGINE_CHROMIUM_FLAGS"] = "--no-sandbox" App = Qt.QApplication(sys.argv) window = WebView() window.show() app.exec_()

Hope it helps if someone gets the same issue !