Re: create-image on console emacs

[Kevin Rodgers <kevin.d.rodgers@gmail.com>]

Lennart Borgman wrote:
> On Thu, May 6, 2010 at 9:56 PM, Gary <help-gnu-emacs@garydjones.name> wrote:
>> Can anyone explain to me why If I use emacs in the console and call
>> create-image I get a message like "Non-X frame used" (whether I use an
>> X11 binary or non-X)? I don't get this at all.
>>
>> The reason I ask is that I am trying to use the code from
>> http://xahlee.org/emacs/emacs_html.html (*waves*) and as I said to Xah
>> Lee off-list, while it may well be necessary to (for example) get an
>> image's dimensions in order to display an image, the reverse is not
>> true. Other console tools are able to do it fine, for example
>> ImageMagick can tell me the dimensions from the command line:
>>
>> $ identify work/web1/Bilder/aussen.jpg
>> work/web1/Bilder/aussen.jpg JPEG 874x583 874x583+0+0 DirectClass 8-bit
>> 58.75kb
>>
>> X doesn't need to get involved until such time things actually (try to)
>> get displayed.
> 
> I tested this starting from "emacs -nw":
> 
>   (setq x (create-image "c:/my-image.jpg"))
>   (setq s (image-size x t))
> 
> create-image works, but image-size fails.with "Non-W32 frame used".
> 
> It looks like the reason is that internally images are in some way
> bound to frames. I do not know the reason for this, but you can see it
> in the code of `image-size'.
> 
> Maybe it is a bug. Please submit a bug report.

Just a guess: the size of the image depends on the resolution of the
display system.

-- 
Kevin Rodgers
Denver, Colorado, USA