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 ... Thanks Ivan On Fri, Aug 21, 2020 at 1:57 AM Carlos Alberto Lopez Perez < clo...@igalia.com> wrote: > On 20/08/2020 12:24, Ivan Klimek wrote: > > Dear webkit-gtk developers, > > > > I am trying to render a webpage to SVG, I am successful in doing so > > using Qt webkit - but as you all know Qt webkit has been discontinued > > thus I am trying to migrate my code to webkit GTK > > > > the problem I am facing is that the generated SVG is only a wrapped PNG > > image of the rendered webpage, on Qt the webpage is rendered "all > > vector" texts etc all is "vectorized" an example of using this approach > > are apps like: http://cutycapt.sourceforge.net/ or > https://wkhtmltopdf.org/ > > > > my code is as follows (parts omitted for brevity): > > > > g_signal_connect(main_window, "damage-event", G_CALLBACK(capture), > > main_window); > > > > static gboolean capture(GtkWidget *widget, GdkEvent *event, gpointer > > user_data) > > { > > > > fprintf(stderr, "damage event callback called..\n"); > > > > cairo_surface_t *surface = > > gtk_offscreen_window_get_surface(GTK_OFFSCREEN_WINDOW(user_data)); > > > > Instead of getting the cairo surface from GTK, you can use the WebKitGTK > API directly with the functions webkit_web_view_get_snapshot* > > Years ago I wrote a simple program that generates a png image from a > webpage with that. Check it here: https://github.com/clopez/wksnap > > I tried now to use your example code to generate a svg image instead of > a png one [1], but I'm getting the same issue you comment of it > generating a svg image that is embedding a png one. > > I'm unsure how to fix that. My limited understanding is that once you > get the cairo surface from webkit, that surface is already a bitmap > surface.. so I'm unsure if is possible to convert that back to a vector > surface. I wonder how QtWebKit did this?? > > > Hope this helps. > Regards > > > [1] test patch to apply over wksnap: http://ix.io/2uLb > >
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