Class: Magick::Image::Info

Inherits:
Object
  • Object
show all
Defined in:
ext/RMagick/rmmain.c

Instance Method Summary collapse

Constructor Details

#initializeObject

Method: Info#initialize Purpose: If an initializer block is present, run it.


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# File 'ext/RMagick/rminfo.c', line 1919

VALUE
Info_initialize(VALUE self)
{
    if (rb_block_given_p())
    {
        // Run the block in self's context
        (void) rb_obj_instance_eval(0, NULL, self);
    }
    return self;
}

Instance Method Details

#[]Object

#[]=(*args) ⇒ Object

Method: Info[format, key] = value Purpose: Call SetImageOption Note: Essentially the same function as Info#define but paired with Info#[]=

If the value is nil it is equivalent to #undefine.

The 2 argument form is the original form. Added support for a
single argument after ImageMagick started using Set/GetImageOption
for options that aren't represented by fields in the ImageInfo
structure.

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# File 'ext/RMagick/rminfo.c', line 250

VALUE
Info_aset(int argc, VALUE *argv, VALUE self)
{
    Info *info;
    volatile VALUE value;
    char *format_p, *key_p, *value_p = NULL;
    long format_l, key_l;
    char ckey[MaxTextExtent];
    unsigned int okay;


    Data_Get_Struct(self, Info, info);

    switch (argc)
    {
        case 3:
            format_p = rm_str2cstr(argv[0], &format_l);
            key_p = rm_str2cstr(argv[1], &key_l);

            if (format_l > MAX_FORMAT_LEN || format_l+key_l > MaxTextExtent-1)
            {
                rb_raise(rb_eArgError, "%.60s:%.1024s not defined - too long", format_p, key_p);
            }

            (void) sprintf(ckey, "%.60s:%.*s", format_p, (int)(sizeof(ckey)-MAX_FORMAT_LEN), key_p);

            value = argv[2];
            break;

        case 2:
            strncpy(ckey, StringValuePtr(argv[0]), sizeof(ckey)-1);
            ckey[sizeof(ckey)-1] = '\0';

            value = argv[1];
            break;

        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or 3)", argc);
            break;
    }

    if (NIL_P(value))
    {
        (void) RemoveImageOption(info, ckey);
    }
    else
    {
        /* Allow any argument that supports to_s */
        value = rm_to_s(value);
        value_p = StringValuePtr(value);

        (void) RemoveImageOption(info, ckey);
        okay = SetImageOption(info, ckey, value_p);
        if (!okay)
        {
            rb_warn("`%s' not defined - SetImageOption failed.", ckey);
            return Qnil;
        }
    }


    return self;
}

#channel(*args) ⇒ Object

Method: Info#channel(channel [, channel…]) Purpose: Set the channels Thanks: Douglas Sellers


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# File 'ext/RMagick/rminfo.c', line 463

VALUE
Info_channel(int argc, VALUE *argv, VALUE self)
{
    Info *info;
    ChannelType channels;

    channels = extract_channels(&argc, argv);

    // Ensure all arguments consumed.
    if (argc > 0)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    Data_Get_Struct(self, Info, info);

    info->channel = channels;
    return self;
}

#define(*args) ⇒ Object

Method: Info#define(format, key[, value]) Purpose: Call SetImageOption Note: The only method in Info that is not an

attribute accessor.

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# File 'ext/RMagick/rminfo.c', line 549

VALUE
Info_define(int argc, VALUE *argv, VALUE self)
{
    Info *info;
    char *format, *key;
    const char *value = "";
    long format_l, key_l;
    char ckey[100];
    unsigned int okay;
    volatile VALUE fmt_arg;

    Data_Get_Struct(self, Info, info);

    switch (argc)
    {
        case 3:
            /* Allow any argument that supports to_s */
            fmt_arg = rb_String(argv[2]);
            value = (const char *)StringValuePtr(fmt_arg);
        case 2:
            key = rm_str2cstr(argv[1], &key_l);
            format = rm_str2cstr(argv[0], &format_l);
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or 3)", argc);
    }

    if (2 + format_l + key_l > (long)sizeof(ckey))
    {
        rb_raise(rb_eArgError, "%.20s:%.20s not defined - format or key too long", format, key);
    }
    (void) sprintf(ckey, "%s:%s", format, key);

    (void) RemoveImageOption(info, ckey);
    okay = SetImageOption(info, ckey, value);
    if (!okay)
    {
        rb_warn("%.20s=\"%.78s\" not defined - SetImageOption failed.", ckey, value);
        return Qnil;
    }

    return self;
}

#freezeObject

Extern: rm_no_freeze(obj) Purpose: overrides freeze in classes that can't be frozen.


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# File 'ext/RMagick/rmutil.c', line 200

VALUE
rm_no_freeze(VALUE obj)
{
    rb_raise(rb_eTypeError, "can't freeze %s", rb_class2name(CLASS_OF(obj)));
    return (VALUE)0;
}

#undefine(format, key) ⇒ Object

Method: Info#undefine Purpose: Undefine image option


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# File 'ext/RMagick/rminfo.c', line 1755

VALUE
Info_undefine(VALUE self, VALUE format, VALUE key)
{
    Info *info;
    char *format_p, *key_p;
    long format_l, key_l;
    char fkey[MaxTextExtent];

    format_p = rm_str2cstr(format, &format_l);
    key_p = rm_str2cstr(key, &key_l);

    if (format_l > MAX_FORMAT_LEN || format_l + key_l > MaxTextExtent)
    {
        rb_raise(rb_eArgError, "can't undefine %.60s:%.1024s - too long", format_p, key_p);
    }

    sprintf(fkey, "%.60s:%.*s", format_p, (int)(MaxTextExtent-61), key_p);

    Data_Get_Struct(self, Info, info);
    /* Depending on the IM version, RemoveImageOption returns either */
    /* char * or MagickBooleanType. Ignore the return value.         */
    (void) RemoveImageOption(info, fkey);

    return self;
}