Re: Pango cairo target surface size
Rob Kramer <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Message-ID | <[email protected]> |
On 03/23/2015 11:43 AM, Lawrence D'Oliveiro wrote:
> On Mon, 23 Mar 2015 11:29:51 +0800, Rob Kramer wrote:
>
>> On 03/23/2015 11:20 AM, Lawrence D'Oliveiro wrote:
>>
>>
>>> That’s easy. You can create an ImageSurface with 0 width and 0
>>> height, put a cairo_t on top of that, and do your text measurements
>>> without any drawing taking place.
>> But how does that result in an image surface equal to the extents of
>> the string?
> You use it to measure the text_extents with cairo_text_extents or
> cairo_glyph_extents
> <http://cairographics.org/manual/cairo-text.html#cairo-text-extents>.
Ah, I think you misunderstood my question.. If all I wanted was to
calculate extents, I could use plain Pango too.
What I want to do is paint a string to a surface the same size as the
text's logical extents -- without doing the text layouting twice (once
to calculate the extents, once to paint). Since I cannot change the
target image size after it is set, or import an existing Pango layout
into Cairo, I wondered whether anyone on this list would know of a method.
Cheers!
Rob
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