1 files changed, 177 insertions, 0 deletions
diff --git a/Src/Plugins/Visualization/vis_avs/undo.cpp b/Src/Plugins/Visualization/vis_avs/undo.cpp
new file mode 100644
index 00000000..0010dcf1
--- /dev/null
+++ b/Src/Plugins/Visualization/vis_avs/undo.cpp
@@ -0,0 +1,177 @@
+/*
+  LICENSE
+  -------
+Copyright 2005 Nullsoft, Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, 
+are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer. 
+
+  * Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation
+    and/or other materials provided with the distribution. 
+
+  * Neither the name of Nullsoft nor the names of its contributors may be used to 
+    endorse or promote products derived from this software without specific prior written permission. 
+ 
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR 
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
+FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
+OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*/
+#include <windows.h>
+#include "undo.h"
+#include "render.h"
+
+int C_UndoStack::list_pos;
+C_UndoItem *C_UndoStack::list[256];
+
+C_UndoItem::C_UndoItem() : data(NULL), length(0), isdirty(true)
+{
+}
+
+C_UndoItem::C_UndoItem(const C_UndoItem& T) : data(NULL), length(0), isdirty(true)
+{
+  *this = T;
+}
+
+C_UndoItem::C_UndoItem(void *_data, int _length, bool _isdirty) : data(NULL), length(length), isdirty(_isdirty)
+{
+  data = GlobalAlloc(GPTR, length);
+  memcpy(data, _data, length);
+}
+
+C_UndoItem::~C_UndoItem()
+{
+  if (data) 
+  {
+    GlobalFree(data);
+  }
+}
+
+C_UndoItem & C_UndoItem::operator = (const C_UndoItem& T)
+{
+  length = T.length;
+  isdirty = T.isdirty;
+  if (data) 
+  {
+    GlobalFree(data);
+  }
+  data = GlobalAlloc(GPTR, length);
+  memcpy(data, T.data, length);
+  return *this;
+}
+
+bool C_UndoItem::operator == (const C_UndoItem& T) const
+{
+  bool retval = false;
+  if (length == T.length)
+  {
+    retval = (memcmp(data, T.data, length) == 0);
+  }
+  return retval;
+}
+
+void C_UndoItem::set(void *_data, int _length, bool _isdirty)
+{
+  length = _length;
+  isdirty = _isdirty;
+  if (data) 
+  {
+    GlobalFree(data);
+  }
+  data = GlobalAlloc(GPTR, length);
+  memcpy(data, _data, length);
+}
+
+
+void C_UndoStack::saveundo(int is2)
+{
+  // Save to the undo buffer (sets the dirty bit for this item)
+  C_UndoItem *item = new C_UndoItem;
+  C_UndoItem *old = list[list_pos];
+
+  if (is2) 
+  {
+    g_render_effects2->__SavePresetToUndo(*item);
+  }
+  else 
+  {
+    g_render_effects->__SavePresetToUndo(*item);
+  }
+
+  // Only add it to the stack if it has changed.
+  if (!old || !(*old == *item))
+  {
+    if (list_pos == sizeof(list)/sizeof(list[0])-1)
+    {
+      delete list[0];
+      memcpy(list,list+1,sizeof(list)/sizeof(list[0])-1);
+      list_pos--;
+    }
+    list[++list_pos]=item;
+  }
+  else delete item;
+}
+
+void C_UndoStack::cleardirty()
+{
+  // If we're clearing the dirty bit, we only clear it on the current item.
+  if (list_pos >= 0 && list_pos < sizeof(list)/sizeof(list[0]) && list[list_pos])
+  {
+    list[list_pos]->isdirty = 0;
+  }
+}
+
+bool C_UndoStack::isdirty()
+{
+  if (list_pos >= 0 && list_pos < sizeof(list)/sizeof(list[0]) && list[list_pos])
+    return list[list_pos]->isdirty;
+  return false;
+}
+
+int C_UndoStack::can_undo()
+{
+  return (list_pos>0 && list[list_pos-1]);
+}
+
+int C_UndoStack::can_redo()
+{
+  return list_pos < sizeof(list)/sizeof(list[0])-1 && list[list_pos+1];
+}
+
+
+void C_UndoStack::undo()
+{
+  if (list_pos>0 && list[list_pos-1])
+  {
+    g_render_transition->LoadPreset(NULL,0,list[--list_pos]);
+  }
+}
+
+void C_UndoStack::redo()
+{
+  if (list_pos < sizeof(list)/sizeof(list[0])-1 && list[list_pos+1])
+  {
+    g_render_transition->LoadPreset(NULL,0,list[++list_pos]);
+  }
+}
+
+void C_UndoStack::clear()
+{
+  list_pos=0;
+  int x;
+  for (x = 0; x < sizeof(list)/sizeof(list[0]); x ++)
+  {
+    delete list[x];
+    list[x]=0;
+  }
+}