[cairo] RFC: introduce cairo_surface_get_height() / width()
ajohnson at redneon.com
Sat Jul 9 12:15:01 UTC 2016
On 09/07/16 00:40, Uli Schlachter wrote:
> Am 08.07.2016 um 11:43 schrieb Enrico Weigelt, metux IT consult:
>> retrieving surface dimensions currently only works by surface-type
>> specific functions, which isn't particularily good encapsulation.
>> So, should we introduce generic functions (and corresponding
>> backend ops) for that ?
> What's the size of an unbounded surface?
> cairo_recording_surface_create(CAIRO_CONTENT_COLOR, NULL); creates a surface
> which conceptually has no size limit.
And can also create a surface with a non zero origin. A
cairo_surface_extents() function would be better that a get width/height.
> By the way, there is already a "generic hack" that does what you want. Create a
> new cairo context and ask for its clip extents:
> For unbounded surfaces, you get x1=y1=-INFINITY and x2=y2=INFINITY (no idea if
> this is guaranteed by the documentation, but at least the current implementation
> in _cairo_default_context_clip_extents() does this.
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