Add command to change the palette size manually with a number

data/gui.xml

@@ -725,6 +725,7 @@
       <item command="PaletteEditor" text="&amp;Palette Editor">
         <param name="switch" value="true" />
       </item>
+      <item command="PaletteSize" text="Palette Si&amp;ze" />
       <separator />
       <item command="SetPaletteEntrySize" text="&amp;Small Size">
         <param name="size" value="7" />

data/widgets/palette_size.xml

@@ -0,0 +1,18 @@
+<!-- ASEPRITE -->
+<!-- Copyright (C) 2015 by David Capello -->
+<gui>
+<window text="Palette Size" id="palette_size">
+  <grid columns="3">
+    <label text="Number of colors:" />
+    <entry expansive="true" maxsize="4" id="colors" magnet="true" />
+    <box cell_align="horizontal" />
+
+    <separator horizontal="true" cell_hspan="3" />
+
+    <box horizontal="true" homogeneous="true" cell_hspan="3" cell_align="right">
+      <button text="&amp;OK" closewindow="true" id="ok" magnet="true" minwidth="60" />
+      <button text="&amp;Cancel" closewindow="true" />
+    </box>
+  </grid>
+</window>
+</gui>

src/app/CMakeLists.txt

@@ -201,6 +201,7 @@ add_library(app-lib
   commands/cmd_open_with_app.cpp
   commands/cmd_options.cpp
   commands/cmd_palette_editor.cpp
+  commands/cmd_palette_size.cpp
   commands/cmd_paste.cpp
   commands/cmd_play_animation.cpp
   commands/cmd_refresh.cpp

src/app/commands/cmd_palette_size.cpp

@@ -0,0 +1,79 @@
+// 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/cmd/set_palette.h"
+#include "app/commands/command.h"
+#include "app/commands/params.h"
+#include "app/context_access.h"
+#include "app/modules/palettes.h"
+#include "app/transaction.h"
+#include "doc/palette.h"
+#include "doc/sprite.h"
+
+#include "generated_palette_size.h"
+
+namespace app {
+
+class PaletteSizeCommand : public Command {
+public:
+  PaletteSizeCommand();
+  Command* clone() const override { return new PaletteSizeCommand(*this); }
+
+protected:
+  void onLoadParams(const Params& params) override;
+  void onExecute(Context* context) override;
+
+private:
+  int m_size;
+};
+
+PaletteSizeCommand::PaletteSizeCommand()
+  : Command("PaletteSize",
+            "Palette Size",
+            CmdRecordableFlag)
+{
+  m_size = 0;
+}
+
+void PaletteSizeCommand::onLoadParams(const Params& params)
+{
+  m_size = params.get_as<int>("size");
+}
+
+void PaletteSizeCommand::onExecute(Context* context)
+{
+  ContextWriter writer(context);
+  Sprite* sprite = writer.sprite();
+  frame_t frame = writer.frame();
+  Palette palette(*sprite->palette(frame));
+
+  app::gen::PaletteSize window;
+  window.colors()->setTextf("%d", palette.size());
+  window.openWindowInForeground();
+  if (window.getKiller() == window.ok()) {
+    int ncolors = window.colors()->getTextInt();
+    palette.resize(MID(1, ncolors, INT_MAX));
+
+    Transaction transaction(context, "Palette Size", ModifyDocument);
+    transaction.execute(new cmd::SetPalette(sprite, frame, &palette));
+    transaction.commit();
+
+    set_current_palette(&palette, false);
+    ui::Manager::getDefault()->invalidate();
+  }
+}
+
+Command* CommandFactory::createPaletteSizeCommand()
+{
+  return new PaletteSizeCommand;
+}
+
+} // namespace app

src/app/commands/commands_list.h

@@ -80,6 +80,7 @@ FOR_EACH_COMMAND(OpenInFolder)
 FOR_EACH_COMMAND(OpenWithApp)
 FOR_EACH_COMMAND(Options)
 FOR_EACH_COMMAND(PaletteEditor)
+FOR_EACH_COMMAND(PaletteSize)
 FOR_EACH_COMMAND(Paste)
 FOR_EACH_COMMAND(PlayAnimation)
 FOR_EACH_COMMAND(Redo)