Method: MagickWand::Wand#crop

Defined in:
ext/magickwand/wand.c

#crop(*args) ⇒ Object

wand.crop(width, height=width, :x=>x, :y=y, :gravity=gravity, :repage=boolean) x and y default to 0 gravity defaults to NorthWestGravity repage defaults to true



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# File 'ext/magickwand/wand.c', line 913

static VALUE wand_crop(int argc, VALUE *argv, VALUE obj)
{
    Wand *wand;
    Image *image;
    volatile VALUE width, height, options;
    VALUE v;
    unsigned long columns, rows;
    long x, y;
    GravityType gravity;
    GravityType keep_gravity;
    int repage;
    RectangleInfo rect;
    char geometry[200];
    ExceptionInfo exception;

    rb_check_frozen(obj);

    (void) rb_scan_args(argc, argv, "12", &width, &height, &options);
    columns = NUM2ULONG(width);
    if (height != Qnil)
    {
        rows = NUM2ULONG(height);
    }
    else
    {
        rows = columns;
    }
    (void) mwr_get_option(options, "gravity", &v);
    gravity = mwr_string_to_gravitytype(v, NorthWestGravity, RaiseUndefinedOption);
    x = mwr_get_option(options, "x", &v) ? FIX2LONG(v) : 0L;
    y = mwr_get_option(options, "y", &v) ? FIX2LONG(v) : 0L;
    repage = mwr_get_option(options, "repage", &v) ? RTEST(v) : 1;

    (void) sprintf(geometry, "%lux%lu%+ld%+ld", columns, rows, x, y);

    Data_Get_Struct(obj, Wand, wand);
    GetExceptionInfo(&exception);

    MagickResetIterator(wand->magickwand);

    // Crop each image individually. If they're different sizes then the
    // crop rectangle could be different.
    while (MagickNextImage(wand->magickwand) != MagickFalse)
    {
        image = GetImageFromMagickWand(wand->magickwand);
        mwr_check_magickwand_error(wand->magickwand);
        keep_gravity = image->gravity;
        image->gravity = gravity;
        memset(&rect, 0, sizeof(rect));
        (void) ParseGravityGeometry(image, geometry, &rect, &exception);
        MagickCropImage(wand->magickwand, rect.width, rect.height, rect.x, rect.y);
        image->gravity = keep_gravity;
        mwr_check_magickwand_error(wand->magickwand);
        if (repage)
        {
            MagickResetImagePage(wand->magickwand, "0x0+0+0");
            mwr_check_magickwand_error(wand->magickwand);
        }
    }

    DestroyExceptionInfo(&exception);

    return obj;
}