Method: MagickWand::Wand#import_pixels

Defined in:
ext/magickwand/wand.c

#import_pixels(*args) ⇒ Object

wand.import_pixels(x, y, columns, rows, pixels, :map=>“rgb”, :storage_type=>“char”) imports into the first image in the wand



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# File 'ext/magickwand/wand.c', line 1309

static VALUE wand_import_pixels(int argc, VALUE *argv, VALUE obj)
{
    Wand *wand;
    VALUE columns, rows, pixels, options, x_off, y_off, v;
    unsigned long width, height, length;
    long x, y;
    void *data;
    StorageType stg_type;
    char *map;
    size_t stg_type_size;

    rb_check_frozen(obj);

    (void) rb_scan_args(argc, argv, "51", &x_off, &y_off, &columns, &rows, &pixels, &options);
    x = NUM2LONG(x_off);
    y = NUM2LONG(y_off);
    width = NUM2ULONG(columns);
    height = NUM2ULONG(rows);
    StringValue(pixels);
    data = (void *) RSTRING_PTR(pixels);
    length = (unsigned long) RSTRING_LEN(pixels);

    (void) mwr_get_option(options, "map", &v);
    map = v != Qnil ? StringValuePtr(v) : "RGB";
    (void) mwr_get_option(options, "storage_type", &v);
    stg_type = mwr_string_to_storagetype(v, CharPixel, RaiseUndefinedOption);
    stg_type_size = get_stg_type_size(stg_type);

    if (length < width*height*stg_type_size*strlen(map))
    {
        rb_raise(rb_eArgError, "pixel buffer too small (expecting %lu got %lu)",
            width*height*stg_type_size*strlen(map), length);
    }

    Data_Get_Struct(obj, Wand, wand);
    MagickResetIterator(wand->magickwand);
    MagickImportImagePixels(wand->magickwand, x, y, width, height, map, stg_type, data);
    mwr_check_magickwand_error(wand->magickwand);

    return obj;
}