Object extension.

Port resize extension.
Sensible extension(s) implementation design for Ingen.
Replace string port extension support in Ingen with Object port extension.
Implement port resize extension in Ingen.
Some test plugins for this stuff.


git-svn-id: http://svn.drobilla.net/lad/trunk/ingen@2260 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 119 insertions, 0 deletions

diff --git a/src/engine/ObjectBuffer.cpp b/src/engine/ObjectBuffer.cpp
new file mode 100644
index 00000000..0f40ea9a
--- /dev/null
+++ b/src/engine/ObjectBuffer.cpp
@@ -0,0 +1,119 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2009 Dave Robillard <http://drobilla.net>
+ *
+ * Ingen is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * Ingen is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define __STDC_LIMIT_MACROS 1
+#include <string.h>
+#include <stdint.h>
+#include <algorithm>
+#include <iostream>
+#include "uri-map.lv2/uri-map.h"
+#include "ingen-config.h"
+#include "shared/LV2Features.hpp"
+#include "shared/LV2URIMap.hpp"
+#include "ObjectBuffer.hpp"
+#include "Engine.hpp"
+
+using namespace std;
+
+namespace Ingen {
+
+using namespace Shared;
+
+
+/** Allocate a new string buffer.
+ * \a capacity is in bytes.
+ */
+ObjectBuffer::ObjectBuffer(size_t capacity)
+	: Buffer(DataType(DataType::OBJECT), capacity)
+{
+	capacity = std::max(capacity, (size_t)32);
+	cerr << "Creating Object Buffer " << _buf << " capacity = " << capacity << endl;
+	_local_buf = (LV2_Object*)malloc(sizeof(LV2_Object) + capacity);
+	_buf = _local_buf;
+	clear();
+}
+
+
+void
+ObjectBuffer::clear()
+{
+	// nil
+	_buf->type = 0;
+	_buf->size = 0;
+}
+
+
+/** Use another buffer's data instead of the local one.
+ *
+ * This buffer will essentially be identical to @a buf after this call.
+ */
+bool
+ObjectBuffer::join(Buffer* buf)
+{
+	assert(buf != this);
+	ObjectBuffer* sbuf = dynamic_cast<ObjectBuffer*>(buf);
+	if (!sbuf)
+		return false;
+
+	_buf = sbuf->_local_buf;
+	_joined_buf = sbuf;
+
+	return true;
+}
+
+
+void
+ObjectBuffer::unjoin()
+{
+	_joined_buf = NULL;
+	_buf = _local_buf;
+}
+
+
+void
+ObjectBuffer::copy(Context& context, const Buffer* src_buf)
+{
+	const ObjectBuffer* src = dynamic_cast<const ObjectBuffer*>(src_buf);
+	if (!src || src == this || src->_buf == _buf)
+		return;
+
+	// Copy if src is a POD object only, that fits
+	if (src->_buf->type != 0 && src->_buf->size <= size())
+		memcpy(_buf, src->_buf, sizeof(LV2_Object) + src->_buf->size);
+}
+
+
+void
+ObjectBuffer::resize(size_t size)
+{
+	const bool     using_local_data = (_buf == _local_buf);
+	const uint32_t contents_size    = sizeof(LV2_Object) + _buf->size;
+
+	_local_buf = (LV2_Object*)realloc(_buf, sizeof(LV2_Object) + size);
+	_size      = size;
+
+	// If we shrunk and chopped the current contents, clear corrupt data
+	if (size < contents_size)
+		clear();
+
+	if (using_local_data)
+		_buf = _local_buf;
+}
+
+
+} // namespace Ingen
+