Add "Edit > New Sprite from Selection" command

data/gui.xml

@@ -350,6 +350,7 @@
       </key>
 
       <key command="NewBrush" shortcut="Ctrl+B" mac="Cmd+B" />
+      <key command="NewSpriteFromSelection" shortcut="Ctrl+Alt+N" mac="Cmd+Alt+N" />
     </commands>
 
     <!-- Keyboard shortcuts to select tools -->
@@ -479,8 +480,7 @@
           <param name="orientation" value="vertical" />
         </item>
         <item command="MaskContent" text="Transfor&amp;m" />
-        <item command="NewBrush" text="New &amp;Brush" />
-        <menu text="Shift">
+        <menu text="&amp;Shift">
           <item command="MoveMask" text="&amp;Left">
             <param name="target" value="content" />
             <param name="direction" value="left" />
@@ -511,6 +511,9 @@
           </item>
         </menu>
         <separator />
+        <item command="NewBrush" text="New &amp;Brush" />
+        <item command="NewSpriteFromSelection" text="&amp;New Sprite from Selection" />
+        <separator />
         <item command="ReplaceColor" text="R&amp;eplace Color..." />
         <item command="InvertColor" text="&amp;Invert" />
         <menu text="F&amp;X" id="fx_popup">

src/app/CMakeLists.txt

@@ -200,6 +200,7 @@ add_library(app-lib
   commands/cmd_new_frame_tag.cpp
   commands/cmd_new_layer.cpp
   commands/cmd_new_layer_set.cpp
+  commands/cmd_new_sprite_from_selection.cpp
   commands/cmd_onionskin.cpp
   commands/cmd_open_file.cpp
   commands/cmd_open_in_folder.cpp

src/app/commands/cmd_new_sprite_from_selection.cpp

@@ -0,0 +1,98 @@
+// 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 version 2 as
+// published by the Free Software Foundation.
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "app/commands/command.h"
+#include "app/context.h"
+#include "app/document.h"
+#include "app/util/new_image_from_mask.h"
+#include "base/path.h"
+#include "doc/cel.h"
+#include "doc/mask.h"
+#include "doc/palette.h"
+#include "doc/layer.h"
+#include "doc/site.h"
+#include "doc/sprite.h"
+#include "doc/document.h"
+
+#include <cstdio>
+
+namespace app {
+
+using namespace doc;
+
+class NewSpriteFromSelectionCommand : public Command {
+public:
+  NewSpriteFromSelectionCommand();
+  Command* clone() const override { return new NewSpriteFromSelectionCommand(*this); }
+
+protected:
+  bool onEnabled(Context* context) override;
+  void onExecute(Context* context) override;
+};
+
+NewSpriteFromSelectionCommand::NewSpriteFromSelectionCommand()
+  : Command("NewSpriteFromSelection",
+            "New Sprite From Selection",
+            CmdUIOnlyFlag)
+{
+}
+
+bool NewSpriteFromSelectionCommand::onEnabled(Context* context)
+{
+  return context->checkFlags(ContextFlags::ActiveDocumentIsReadable |
+                             ContextFlags::HasVisibleMask);
+}
+
+void NewSpriteFromSelectionCommand::onExecute(Context* context)
+{
+  const Site site = context->activeSite();
+  const app::Document* doc = static_cast<const app::Document*>(site.document());
+  const Sprite* sprite = site.sprite();
+  const Mask* mask = doc->mask();
+  ImageRef image(
+    new_image_from_mask(site, mask));
+  if (!image)
+    return;
+
+  Palette* palette = sprite->palette(site.frame());
+
+  base::UniquePtr<Sprite> dstSprite(
+    Sprite::createBasicSprite(image->pixelFormat(),
+                              image->width(),
+                              image->height(),
+                              palette->size()));
+
+  palette->copyColorsTo(dstSprite->palette(frame_t(0)));
+
+  LayerImage* dstLayer = static_cast<LayerImage*>(dstSprite->folder()->getFirstLayer());
+  dstLayer->setFlags(site.layer()->flags()); // Copy all flags
+  if (site.layer()->isBackground())
+    dstLayer->configureAsBackground(); // Configure layer name as background
+  copy_image(dstLayer->cel(frame_t(0))->image(), image.get());
+
+  base::UniquePtr<Document> dstDoc(new Document(dstSprite));
+  dstSprite.release();
+  char buf[1024];
+  std::sprintf(buf, "%s-%dx%d-%dx%d",
+               base::get_file_title(doc->filename()).c_str(),
+               mask->bounds().x, mask->bounds().y,
+               mask->bounds().w, mask->bounds().h);
+  dstDoc->setFilename(buf);
+  dstDoc->setContext(context);
+  dstDoc.release();
+}
+
+Command* CommandFactory::createNewSpriteFromSelectionCommand()
+{
+  return new NewSpriteFromSelectionCommand();
+}
+
+} // namespace app

src/app/commands/commands_list.h

@@ -75,6 +75,7 @@ FOR_EACH_COMMAND(NewFrame)
 FOR_EACH_COMMAND(NewFrameTag)
 FOR_EACH_COMMAND(NewLayer)
 FOR_EACH_COMMAND(NewLayerSet)
+FOR_EACH_COMMAND(NewSpriteFromSelection)
 FOR_EACH_COMMAND(OpenFile)
 FOR_EACH_COMMAND(OpenInFolder)
 FOR_EACH_COMMAND(OpenWithApp)