Correctly handle reuse of screens in yaml file.

BUG=chromium-os:12161
TEST=manual

  cd src/platform/vboot_reference
  make
  make runbmptests

Change-Id: Ic7708474ce7009744c9f12154d1967bdae8e55d2

Review URL: http://codereview.chromium.org/6534025

tests/bitmaps/TestBmpBlock.py

@@ -134,6 +134,29 @@ class TestReproducable(unittest.TestCase):
     rc, out, err = runprog('/bin/rm', '-f', 'ORDER1', 'ORDER2')
     self.assertEqual(0, rc)
 
+class TestReuse(unittest.TestCase):
+
+  def setUp(self):
+    rc, out, err = runprog('/bin/rm', '-rf', './FOO_DIR', 'FOO')
+    self.assertEqual(0, rc)
+
+  def testReuse(self):
+    """Reusing screens in the yaml file should be okay"""
+    rc, out, err = runprog(prog, '-c', 'case_reuse.yaml', 'FOO')
+    self.assertEqual(0, rc)
+    rc, out, err = runprog(prog, '-x', '-d', './FOO_DIR', 'FOO')
+    self.assertEqual(0, rc)
+    os.chdir('./FOO_DIR')
+    rc, out, err = runprog(prog, '-c', 'config.yaml', 'BAR')
+    self.assertEqual(0, rc)
+    rc, out, err = runprog('/usr/bin/cmp', '../FOO', 'BAR')
+    self.assertEqual(0, rc)
+    os.chdir('..')
+
+  def tearDown(self):
+    rc, out, err = runprog('/bin/rm', '-rf', './FOO_DIR', 'FOO')
+    self.assertEqual(0, rc)
+
 
 # Run these tests
 if __name__ == '__main__':

tests/bitmaps/case_reuse.yaml

@@ -0,0 +1,28 @@
+
+bmpblock: 1.0
+
+images:
+  image0:     Background.bmp
+  image1:     Word.bmp
+
+screens:
+  scr_a0:
+    - [0, 0, image0]
+
+  scr_b0:
+    - [0, 0, image0]
+
+  scr_c0:
+    - [0, 0, image0]
+
+  scr_d0:
+    - [0, 0, image0]
+
+  scr_z:
+    - [45, 45, image1 ]
+
+localizations:
+  - [ scr_a0, scr_b0, scr_c0, scr_d0 ]
+  - [ scr_a0, scr_b0, scr_c0, scr_z ]
+
+

utility/bmpblk_utility.cc

@@ -476,7 +476,8 @@ void BmpBlockUtil::pack_bmpblock() {
 
   /* Compute the ImageInfo offsets from start of BMPBLOCK. */
   uint32_t current_offset = sizeof(BmpBlockHeader) +
-                            sizeof(ScreenLayout) * config_.screens_map.size();
+    sizeof(ScreenLayout) * (config_.header.number_of_localizations *
+                            config_.header.number_of_screenlayouts);
   for (unsigned int i = 0; i < config_.image_names.size(); ++i) {
     string image_name = config_.image_names[i];
     ImageConfig &img = config_.images_map[image_name];