[webkit-gtk] rendering a webpage to SVG

[Ivan Klimek]

Hi Carlos,

I believe that is webkit1 API

Thank you
Ivan


On Fri, Aug 21, 2020 at 12:41 PM Ivan Klimek <ivan at xclbr.com> wrote:

> Thanks for your great input Konstantin, sorry if I touched your feelings
> but Qt Webkit is no longer officially maintained by Qt and as far I know -
> from your own release notes - you ship with known unpatched vulnerabilities
>
> I highly respect your efforts but being able to generate vector SVGs of
> webpages using webkit-GTK would be clearly a more future-proof approach
>
> Thank you
> Ivan
>
>
> On Fri, Aug 21, 2020 at 11:56 AM Konstantin Tokarev <annulen at yandex.ru>
> wrote:
>
>>
>>
>> 21.08.2020, 11:49, "Ivan Klimek" <ivan at xclbr.com>:
>> > Hi Carlos,
>> >
>> > thanks for your fast reply
>> >
>> > not sure if this helps or if your question was addressed to me - from
>> my *very* limited understanding - how its done its done in Qt - they have
>> the qt_svg module that implements methods that directly write vectorized
>> SVG elements:
>> >
>> > void drawEllipse(const QRectF &r) override;
>> >
>> > void drawPath(const QPainterPath &path) override;
>> >
>> > void drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr)
>> override;
>> >
>> > void drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode
>> mode) override;
>> >
>> > void drawRects(const QRectF *rects, int rectCount) override;
>> >
>> > void drawTextItem(const QPointF &pt, const QTextItem &item) override;
>> >
>> > void drawImage(const QRectF &r, const QImage &pm, const QRectF &sr,
>> >
>> > Qt::ImageConversionFlags flags = Qt::AutoColor) override;
>> >
>> > see here:
>> https://github.com/qt/qtsvg/blob/dev/src/svg/qsvggenerator.cpp
>> >
>> > from code its used like this:
>> >
>> >     QWebFrame *frame = m_page.mainFrame();
>> >     QPainter painter;
>> >     QSvgGenerator svg;
>> >
>> >     svg.setFileName(fileName);
>> >     svg.setSize(resolution);
>> >
>> >     painter.begin(&svg);
>> >
>> >     frame->render(&painter);
>> >
>> > and that's all - output is vector SVG - every text / formatting etc all
>> vector
>> >
>> > cairo is able to draw to SVG vectorized too, but the surface types need
>> to be set correctly when drawing, I took a very light look at webkit-gtk
>> cairo usage and cairo surface types are image types / aka bitmap so it
>> draws stuff already to bitmap, and once in bitmap there is no way back :(
>> but maybe I am reading this wrong, not sure
>> >
>> > *I do not know why this is done the way it is done in webkit-gtk, maybe
>> it would be possible to just internally use svg surfaces?*
>> >
>> > would be epic if webkit-gtk could do something like that as Qt Webkit
>> is dead and there are so many projects using this ...
>>
>> QtWebKit is not dead, I'm working on it.
>> --
>> Regards,
>> Konstantin
>>
>
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