Method

RsvgHandleget_intrinsic_dimensions

since: 2.46

Declaration [src]

void
rsvg_handle_get_intrinsic_dimensions (
  RsvgHandle* handle,
  gboolean* out_has_width,
  RsvgLength* out_width,
  gboolean* out_has_height,
  RsvgLength* out_height,
  gboolean* out_has_viewbox,
  RsvgRectangle* out_viewbox
)

Description [src]

In simple terms, queries the width, height, and viewBox attributes in an SVG document.

If you are calling this function to compute a scaling factor to render the SVG, consider simply using rsvg_handle_render_document() instead; it will do the scaling computations automatically.

Before librsvg 2.54.0, the out_has_width and out_has_height arguments would be set to true or false depending on whether the SVG document actually had width and height attributes, respectively.

However, since librsvg 2.54.0, width and height are now geometry properties per the SVG2 specification; they are not plain attributes. SVG2 made it so that the initial value of those properties is auto, which is equivalent to specifing a value of 100%. In this sense, even SVG documents which lack width or height attributes semantically have to make them default to 100%. This is why since librsvg 2.54.0, out_has_width and out_has_heigth are always returned as TRUE, since with SVG2 all documents have a default width and height of 100%.

As an example, the following SVG element has a width of 100 pixels and a height of 400 pixels, but no viewBox. This function will return those sizes in out_width and out_height, and set out_has_viewbox to FALSE.

<svg xmlns="http://www.w3.org/2000/svg" width="100" height="400">

Conversely, the following element has a viewBox, but no width or height. This function will set out_has_viewbox to TRUE, and it will also set out_has_width and out_has_height to TRUE but return both length values as 100%.

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 400">

Note that the RsvgLength return values have RsvgUnits in them; you should not assume that they are always in pixels. For example, the following SVG element will return width and height values whose units fields are RSVG_UNIT_MM.

<svg xmlns="http://www.w3.org/2000/svg" width="210mm" height="297mm">

API ordering: This function must be called on a fully-loaded handle. See the section “API ordering” for details.

Panics: this function will panic if the handle is not fully-loaded.

Available since: 2.46