Hi
Am 08/09/2020 um 18:44 schrieb Tim Roberts:
Dennis Pielken wrote:
...
I want to use QWebEngineView to create a screenshot of a complete web
page. This is mostly working for “shorter pages”, but it is not
working for longer pages.
The only solution to take a screenshot of a complete webpage is to
resize the QWebEngineView to the contentSize of QWebEnginePage. The
following code is working for shorter pages (self inherits
QWebEngineView):
...
generates the following errors:
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
...
QOpenGLFramebufferObject: Framebuffer incomplete attachment.
QOpenGLFramebufferObject: Framebuffer incomplete, missing attachment.
[13092:9676:0908/151509.277:ERROR:gles2_cmd_decoder.cc(5678)]
GLES2DecoderImpl::ResizeOffscreenFramebuffer failed to allocate
storage due to excessive dimensions.
...
This error can be reproduced with longer Facebook timelines as well.
The gles2 errors (the last three lines) are repeated indefinitely. I
have not found a way to fix this. I have checked that the page is not
bigger than the maximum size of the widget.
What do you mean by that? Facebook pages can be infinitely long; they
generate new data as you scroll toward the bottom of what was already
sent. There are limits to the size of bitmaps, and of course there
are limits to your memory. Even the browsers don't store the whole
page in memory as a bitmap.
I may have described the problem not detailed enough. I want to create a
screenshot of the webpage in the state that has been loaded by the
user. Therefore, the page will always have a finite height / width.
An example page, where the problem occurs, is www.heise.de - just scroll
down until you reach the end and screenshot code will fail.
Before I resize QWebEngineView, I check that contentSize is not bigger
than qwidget.maximumHeight. Therefore, the resize should be possible (?)
But it fails.
I know about possible work-around (just don't resize, grab the current
widget, set all elements withposition:fixed to non-fixed and scroll
down, but then you have do deactivate any kind of dynamic reload so that
no additional data is being loaded by scrolling). Therefore, I would
like to achieve this without scrolling in the page.
I do understand that QImage and QPixmap have a maximum size and
therefore (in case the resize work), I have to grab() the widget in
chunks. But I don't even reach this ;)
Am I missing anything or is it just not possible?
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