Module: Axon::JPEGNativeWriter

Included in:

JPEGWriter

Defined in:

ext/axon/jpeg_native_writer.c

Instance Method Summary

• #write ⇒ nil

  Compress image and write the jpeg.

Instance Method Details

#write ⇒ nil

Compress image and write the jpeg.

Returns:

• (nil)

# File 'ext/axon/jpeg_native_writer.c', line 190

static VALUE
jpeg_native_write(VALUE self)
{
    struct jpeg_compress_struct cinfo;
    struct buf_dest_mgr mgr;
    VALUE io, rb_bufsize, ensure_args[2];
    int bufsize;

    io         = rb_funcall(self, id_io, 0);
    rb_bufsize = rb_funcall(self, id_bufsize, 0);
    bufsize = FIX2INT(rb_bufsize);

    if (bufsize < 1)
	rb_raise(rb_eRuntimeError, "Buffer size must be greater than zero");

    cinfo.err = &jerr;

    jpeg_create_compress(&cinfo);

    mgr.pub.init_destination = init_destination;
    mgr.pub.empty_output_buffer = empty_output_buffer;
    mgr.pub.term_destination = term_destination;
    mgr.alloc = bufsize;
    mgr.io = io;
    cinfo.dest = (struct jpeg_destination_mgr *)&mgr;

    ensure_args[0] = self;
    ensure_args[1] = (VALUE)&cinfo;

    return rb_ensure(write2, (VALUE)ensure_args, write2_ensure,
		     (VALUE)ensure_args);
}