[ Version ( deprecated = true , deprecated_since = "2.52." , since = "2.14" ) ]
public bool render_cairo (Context cr)
Warning: render_cairo is deprecated since 2.52..
Draws a loaded SVG handle to a Cairo context.
Please use [[email protected]_document] instead; that function lets you pass a viewport and obtain a good error message.
Please try to use [[email protected]_document] instead, which allows you to pick the size at which the document will be rendered.
Historically this function has picked a size by itself, based on the following rules:
* If the SVG document has both `width` and `height` attributes with physical units (px, in, cm, mm, pt, pc) or font-based units (em, ex ), the function computes the size directly based on the dots-per-inch (DPI) you have configured with [[email protected]_dpi]. This is the same approach as [[email protected]_intrinsic_size_in_pixels].
* Otherwise, if there is a `viewBox` attribute and both `width` and `height` are set to `100%` (or if they don't exist at all and thus default to 100%), the function uses the width and height of the `viewBox` as a pixel size. This produces a rendered document with the correct aspect ratio.
* Otherwise, this function computes the extents of every graphical object in the SVG document to find the total extents. This is moderately expensive, but no more expensive than rendering the whole document, for example.
* This function cannot deal with percentage-based units for `width` and `height` because there is no viewport against which they could be resolved; that is why it will compute the extents of objects in that case. This is why we recommend that you use [ [email protected]_document] instead, which takes in a viewport and follows the sizing policy from the web platform.
Drawing will occur with respect to the cr's current transformation: for example, if the cr has a rotated
current transformation matrix, the whole SVG will be rotated in the rendered version.
This function depends on the [[email protected]]'s DPI to compute dimensions in pixels, so you should call [[email protected]_dpi] beforehand.
Note that cr must be a Cairo context that is not in an error state, that is, `cairo_status()` must return
`CAIRO_STATUS_SUCCESS` for it. Cairo can set a context to be in an error state in various situations, for example, if it was passed an
invalid matrix or if it was created for an invalid surface.
| this | |
| cr |
A Cairo context |
|
`TRUE` if drawing succeeded; `FALSE` otherwise. |