Add "File->Save snapshot" menu item to export the displayed screen.

Change-Id: Ia0e14a768d6ba6dadd520cd7c3961759771dab08

BUG=chromium-os:12643
TEST=none

Review URL: http://codereview.chromium.org/6588139

scripts/newbitmaps/lib/bmpblock.py

@@ -102,3 +102,11 @@ class BmpBlock(object):
         sc = self.yaml['screens'][self.current_screen]
         slist = [(x,y,self.yaml['images'][z]) for x,y,z in sc]
         self.displayer.DisplayScreen(self.current_screen, slist)
+
+  def Saveit(self):
+    """Save current screen to file."""
+    if self.displayer:
+      if self.current_screen:
+        sc = self.yaml['screens'][self.current_screen]
+        slist = [(x,y,self.yaml['images'][z]) for x,y,z in sc]
+        self.displayer.SaveScreen(self.current_screen, slist)

scripts/newbitmaps/lib/pixcontrol.py

@@ -15,6 +15,7 @@ class Frame(wx.Frame):
     m_about = menuFile.Append(wx.ID_ANY, "About...\tCtrl+A")
     menuFile.AppendSeparator()
     m_reload = menuFile.Append(wx.ID_ANY, "Reload\tCtrl+R")
+    m_snapshot = menuFile.Append(wx.ID_ANY, "Save snapshot")
     m_quit = menuFile.Append(wx.ID_ANY, "Quit\tCtrl+Q")
     menuBar = wx.MenuBar()
     menuBar.Append(menuFile, "&File")
@@ -22,6 +23,7 @@ class Frame(wx.Frame):
     self.CreateStatusBar()
     self.Bind(wx.EVT_MENU, self.OnAbout, m_about)
     self.Bind(wx.EVT_MENU, self.OnReload, m_reload)
+    self.Bind(wx.EVT_MENU, self.OnSaveit, m_snapshot)
     self.Bind(wx.EVT_MENU, self.OnQuit, m_quit)
     self.Bind(wx.EVT_CLOSE, self.OnQuit)
 
@@ -78,6 +80,10 @@ class Frame(wx.Frame):
     self.do_update = True;
     self.UpdateControls()
 
+  def OnSaveit(self, event):
+    """Tell the model object to save the view that the user sees."""
+    self.bmpblock.Saveit()
+
   def OnSelected(self, event):
     """User may have picked one of the pulldowns."""
     if event.IsSelection():

scripts/newbitmaps/lib/pixdisplay.py

@@ -37,6 +37,24 @@ class MyPanel(wx.Panel):
       bmp = img.ConvertToBitmap()
       dc.DrawBitmap(bmp, x, y)
 
+  def OnSave(self, name):
+    """Draw the current image sequence into a file."""
+    dc = wx.MemoryDC()
+    done_first = False
+    for x, y, filename in self.imglist:
+      img = wx.Image(filename, wx.BITMAP_TYPE_ANY)
+      if (not done_first):
+        w,h = img.GetSize()
+        base = wx.EmptyBitmap(w,h)
+        dc.SelectObject(base)
+        done_first = True
+      bmp = img.ConvertToBitmap()
+      dc.DrawBitmap(bmp, x, y)
+    new = wx.ImageFromBitmap(base)
+    outfile = name + '.png'
+    new.SaveFile(outfile, wx.BITMAP_TYPE_PNG)
+    print "wrote", outfile
+
 
 class Frame(wx.Frame):
 
@@ -60,3 +78,7 @@ class Frame(wx.Frame):
     self.SetStatusText(name)
     self.p.imglist = imglist
     self.p.OnPaint()
+
+  def SaveScreen(self, name, imglist):
+    self.p.imglist = imglist
+    self.p.OnSave(name)