create-image on console emacs

create-image on console emacs

[Gary]

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.
g
-- 
Gary

Re: create-image on console emacs

[Lennart Borgman]

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.

Re: create-image on console emacs

[Kevin Rodgers]

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

Re: create-image on console emacs

[Lennart Borgman]

On Fri, May 7, 2010 at 12:05 AM, Kevin Rodgers
<kevin.d.rodgers@gmail.com> wrote:
>>
>> 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.


Maybe, I have never understood image sizes. I thought that perhaps the
pixel size was independent of the display.

Re: create-image on console emacs

[Stefan Monnier]

> 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.

Yes, it's a misfeature, indeed.
The implementation of image handling is linked to the particular kinds
of terminal supported since part of that code is related to displaying
the images.


        Stefan