[PySide] How to save svg to png?

[fzet]

I have an svg with css styles (also font-face contains local ttf fonts)
How to save as png?

[fzet]

found solution

from PySide2.QtCore import QUrl
from PySide2.QtGui import QImage, QPainter
from PySide2.QtSvg import QSvgRenderer
from PySide2.QtWidgets import QMainWindow, QApplication
from PySide2.QtWebEngineWidgets import QWebEngineView

class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        path = os.path.join(os.path.dirname(os.path.realpath(__file__)), "dali.svg")
        s = QSvgRenderer(path)
        i = QImage(742, 10116 , QImage.Format_ARGB32)
        p = QPainter(i)
        s.render(p)
        i.save('./test.png')
        p.end()


app = QApplication(sys.argv)
window = MainWindow()
window.show()

app.exec_()

Does QSvgRenderer supports external fonts and css styles? (like font-face)

[SGaist]

Hi,

As stated in the documentation, QtSvg support only the static features of SVG 1.2 tiny.

[fzet]

@SGaist Thank you!
SVG 1.2 tiny supported font-face.
So what's wrong in my code?
My SVG has css style:

@font-face {
    font-family: 'Hack';
    src: url('./Hack.ttf');
}

But it doesn't work
Maybe it has some security restrictions for adding remote files?

And please tell me ,how to add or apply css styles ?

[fzet]

QWebEngineView shows all remote fonts correctly, but QSvgRenderer renders the default font...

[SGaist]

QtWebEngine is a web browser that implements the whole specification. From a cursorary look, QtSvg does not handle font-face.

[fzet]

@SGaist
so sad :(
can I render my svg in QtWebEngine and then save it to png?

[fzet]

@SGaist
I found this example:

i = QImage(746, 516, QImage.Format_ARGB32)
p = QPainter(i)
self.browser.page().view().render(p)

But it doesn't work:

TypeError: 'PySide2.QtWidgets.QWidget.render' called with wrong argument types:
  PySide2.QtWidgets.QWidget.render(QPainter)
Supported signatures:
  PySide2.QtWidgets.QWidget.render(PySide2.QtGui.QPainter, PySide2.QtCore.QPoint, PySide2.QtGui.QRegion = Default(QRegion), PySide2.QtWidgets.QWidget.RenderFlags = Instance(QWidget.RenderFlags(QWidget.DrawWindowBackground | QWidget.DrawChildren)))
  PySide2.QtWidgets.QWidget.render(PySide2.QtGui.QPaintDevice, PySide2.QtCore.QPoint = Default(QPoint), PySide2.QtGui.QRegion = Default(QRegion), PySide2.QtWidgets.QWidget.RenderFlags = Instance(QWidget.RenderFlags(QWidget.DrawWindowBackground | QWidget.DrawChildren)))
Release of profile requested but WebEnginePage still not deleted. Expect troubles !
QPaintDevice: Cannot destroy paint device that is being painted
Segmentation fault (core dumped)

type p == PySide2.QtGui.QPainter

[JonB]

@fzet said in [PySide] How to save svg to png?:

PySide2.QtWidgets.QWidget.render(PySide2.QtGui.QPainter, PySide2.QtCore.QPoint, PySide2.QtGui.QRegion = Default(QRegion), PySide2.QtWidgets.QWidget.RenderFlags = Instance(QWidget.RenderFlags(QWidget.DrawWindowBackground | QWidget.DrawChildren)))

Seems to me that signature claims the QPoint does not default and is required? Or, pass p.device() for the other overload instead. If this all works.

[fzet]

@JonB said in [PySide] How to save svg to png?:

Seems to me that signature claims the QPoint does not default and is required? Or, pass p.device() for the other overload instead. If this all works.

self.browser.page().view().render(p.device())

QPainter::begin: A paint device can only be painted by one painter at a time.
QWidget::render: Cannot render with an inactive painter

Maybe I need to do something else to render SVG from QtWebEngine to PNG? I dont know...