[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...