Add Unlink Cel command

data/gui.xml

@@ -645,6 +645,7 @@
       <item command="CelProperties" text="&amp;Properties..." />
       <separator />
       <item command="ClearCel" text="&amp;Clear" />
+      <item command="UnlinkCel" text="&amp;Unlink" />
     </menu>
 
     <menu id="cel_movement_popup">

src/app/cmd/unlink_cel.cpp

@@ -0,0 +1,64 @@
+/* Aseprite
+ * Copyright (C) 2001-2015  David Capello
+ *
+ * This program 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.
+ *
+ * This program 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 more 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "app/cmd/unlink_cel.h"
+
+#include "doc/cel.h"
+#include "doc/image.h"
+#include "doc/sprite.h"
+
+namespace app {
+namespace cmd {
+
+using namespace doc;
+
+UnlinkCel::UnlinkCel(Cel* cel)
+  : WithCel(cel)
+  , m_oldLinkedImageId(cel->image()->id())
+  , m_newLinkedImageId(0)
+{
+  ASSERT(cel->links());
+}
+
+void UnlinkCel::onExecute()
+{
+  Cel* cel = this->cel();
+  ImageRef oldImage = cel->sprite()->getImage(m_oldLinkedImageId);
+
+  ImageRef copy(Image::createCopy(oldImage));
+  if (m_newLinkedImageId)
+    copy->setId(m_newLinkedImageId);
+  else
+    m_newLinkedImageId = copy->id();
+
+  cel->setImage(copy);
+}
+
+void UnlinkCel::onUndo()
+{
+  Cel* cel = this->cel();
+  ImageRef oldImage = cel->sprite()->getImage(m_oldLinkedImageId);
+  cel->setImage(oldImage);
+}
+
+} // namespace cmd
+} // namespace app

src/app/cmd/unlink_cel.h

@@ -0,0 +1,47 @@
+/* Aseprite
+ * Copyright (C) 2001-2015  David Capello
+ *
+ * This program 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.
+ *
+ * This program 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 more 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef APP_CMD_UNLINK_CEL_H_INCLUDED
+#define APP_CMD_UNLINK_CEL_H_INCLUDED
+#pragma once
+
+#include "app/cmd.h"
+#include "app/cmd/with_cel.h"
+
+namespace app {
+namespace cmd {
+  using namespace doc;
+
+  class UnlinkCel : public Cmd
+                  , public WithCel {
+  public:
+    UnlinkCel(Cel* cel);
+
+  protected:
+    void onExecute() override;
+    void onUndo() override;
+
+  private:
+    ObjectId m_oldLinkedImageId;
+    ObjectId m_newLinkedImageId;
+  };
+
+} // namespace cmd
+} // namespace app
+
+#endif

src/app/commands/cmd_unlink_cel.cpp

@@ -0,0 +1,104 @@
+/* Aseprite
+ * Copyright (C) 2001-2015  David Capello
+ *
+ * This program 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.
+ *
+ * This program 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 more 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "app/app.h"
+#include "app/cmd/unlink_cel.h"
+#include "app/commands/command.h"
+#include "app/context_access.h"
+#include "app/modules/gui.h"
+#include "app/transaction.h"
+#include "app/ui/main_window.h"
+#include "app/ui/timeline.h"
+#include "doc/cel.h"
+#include "doc/layer.h"
+#include "doc/sprite.h"
+
+namespace app {
+
+class UnlinkCelCommand : public Command {
+public:
+  UnlinkCelCommand();
+  Command* clone() const override { return new UnlinkCelCommand(*this); }
+
+protected:
+  bool onEnabled(Context* context);
+  void onExecute(Context* context);
+};
+
+UnlinkCelCommand::UnlinkCelCommand()
+  : Command("UnlinkCel",
+            "Unlink Cel",
+            CmdRecordableFlag)
+{
+}
+
+bool UnlinkCelCommand::onEnabled(Context* context)
+{
+  return context->checkFlags(ContextFlags::ActiveDocumentIsWritable);
+}
+
+void UnlinkCelCommand::onExecute(Context* context)
+{
+  ContextWriter writer(context);
+  Document* document(writer.document());
+  {
+    Transaction transaction(writer.context(), "Unlink Cel");
+    
+    // TODO the range of selected frames should be in the DocumentLocation.
+    Timeline::Range range = App::instance()->getMainWindow()->getTimeline()->range();
+    if (range.enabled()) {
+      Sprite* sprite = writer.sprite();
+
+      for (LayerIndex layerIdx = range.layerBegin(); layerIdx <= range.layerEnd(); ++layerIdx) {
+        Layer* layer = sprite->indexToLayer(layerIdx);
+        if (!layer->isImage())
+          continue;
+
+        LayerImage* layerImage = static_cast<LayerImage*>(layer);
+
+        for (frame_t frame = range.frameEnd(),
+               begin = range.frameBegin()-1;
+             frame != begin;
+             --frame) {
+          Cel* cel = layerImage->cel(frame);
+          if (cel && cel->links())
+            transaction.execute(new cmd::UnlinkCel(cel));
+        }
+      }
+    }
+    else {
+      Cel* cel = writer.cel();
+      if (cel && cel->links())
+        transaction.execute(new cmd::UnlinkCel(writer.cel()));
+    }
+
+    transaction.commit();
+  }
+  update_screen_for_document(document);
+}
+
+Command* CommandFactory::createUnlinkCelCommand()
+{
+  return new UnlinkCelCommand;
+}
+
+} // namespace app

src/app/commands/commands_list.h

@@ -114,4 +114,5 @@ FOR_EACH_COMMAND(SpriteSize)
 FOR_EACH_COMMAND(SwitchColors)
 FOR_EACH_COMMAND(Timeline)
 FOR_EACH_COMMAND(Undo)
+FOR_EACH_COMMAND(UnlinkCel)
 FOR_EACH_COMMAND(Zoom)