Re: ImageMagick error during 'make check'

[Rik]

On 08/05/2013 05:11 AM, Carnë Draug wrote:
> On 4 August 2013 23:02, Rik <address@hidden> wrote:
>> 8/4/13
>>
>> Carnë,
>>
>> I'm getting this nasty looking error while running 'make check'
>>
>>>>>>> processing
>>>>>>> /home/rik/wip/Projects_Mine/octave-dev/scripts/plot/ishghandle.m
>>   ***** test
>>  hf = figure ("visible", "off");
>>  unwind_protect
>>    assert (ishghandle (hf));
>>    assert (! ishghandle (-hf));
>>    l = line;
>>    ax = gca;
>>    assert (ishghandle (ax));
>>    assert (! ishghandle (-ax));
>>    assert (ishghandle (l));
>>    assert (! ishghandle (-l));
>>    p = patch;
>>    assert (ishghandle (p));
>>    assert (! ishghandle (-p));
>>    s = surface;
>>    assert (ishghandle (s));
>>    assert (! ishghandle (-s));
>>    t = text;
>>    assert (ishghandle (t));
>>    assert (! ishghandle (-t));
>>    i = image;
>>    assert (ishghandle (i));
>>    assert (! ishghandle (-i));
>>    hg = hggroup;
>>    assert (ishghandle (hg));
>>    assert (! ishghandle (-hg));
>>  unwind_protect_cleanup
>>    close (hf);
>>  end_unwind_protect
>> !!!!! test failed
>> Magick++ exception: Magick: No decode delegate for this image format
>> (/home/rik/wip/Projects_Mine/octave-dev/scripts/image/default.img) reported
>> by magick/constitute.c:8285 (ReadImage)
>>
>> The problem is the line "i = image" which I think needs to create a default
>> image object, possibly with no data as the text () command does.
>>
>> The backtrace is
>> octave:4> i = image
>> error: Magick++ exception: Magick: No decode delegate for this image format
>> (/home/rik/wip/Projects_Mine/octave-dev/scripts/image/default.img) reported
>> by magick/constitute.c:8285 (ReadImage)
>> error: called from:
>> error:
>> /home/rik/wip/Projects_Mine/octave-dev/scripts/image/private/__imfinfo__.m
>> at line 63, column 10
>> error:
>> /home/rik/wip/Projects_Mine/octave-dev/scripts/image/private/imageIO.m at
>> line 64, column 26
>> error:   /home/rik/wip/Projects_Mine/octave-dev/scripts/image/imfinfo.m at
>> line 123, column 8
>> error:
>> /home/rik/wip/Projects_Mine/octave-dev/scripts/image/private/__imread__.m at
>> line 59, column 8
>> error:
>> /home/rik/wip/Projects_Mine/octave-dev/scripts/image/private/imageIO.m at
>> line 64, column 26
>> error:   /home/rik/wip/Projects_Mine/octave-dev/scripts/image/imread.m at
>> line 102, column 24
>> error:   /home/rik/wip/Projects_Mine/octave-dev/scripts/image/image.m at
>> line 65, column 9
>>
>> Could you take a look at this?
> The problem comes from default.img being an example of the native
> octave image format that I have recently asked to deprecate. The part
> that tries to read the image is around a try catch so it tries the
> native format if it fails. However, I have been adding a bunch of
> function options and need to call imfinfo to set defaults. I will
> place that entire block of code in a try catch but then the test will
> still issue a warning about the format being deprecated.
>
> If we wish to maintain the default.img as it is, and image()
> displaying it as default image, then the best solution is to use the
> following on line 65 (the line using imread with default.img) of image
> function:
>
> img = load (file_in_path (IMAGE_PATH, "default.img")).X;
>
> Should I make this change?
8/5/13

Carnë,

I'm bringing this on to the Maintainer's list.

What should the default behavior be if you call image() with no arguments? 
Does Matlab automatically invent an image?  Or does it create an image with
no data?

It seems like the sensible thing would be to either warn that the function
was called incorrectly or to create a null image object in the same way
that text() will create a valid text object, but with the string set to "".

--Rik