Adding files skipped from previous patch: http://code.google.com/p/skia/source/detail?r=4310

Review URL: https://codereview.appspot.com/6339043/

git-svn-id: http://skia.googlecode.com/svn/trunk@4312 2bbb7eff-a529-9590-31e7-b0007b416f81

tools/picture_utils.cpp

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "picture_utils.h"
+#include "SkBitmap.h"
+#include "SkPicture.h"
+#include "SkString.h"
+#include "SkStream.h"
+
+namespace sk_tools {
+
+    void make_filepath(SkString* path, const char* dir, const SkString& name) {
+        size_t len = strlen(dir);
+        path->set(dir);
+        if (0 < len  && '/' != dir[len - 1]) {
+            path->append("/");
+        }
+        path->append(name);
+    }
+
+    void setup_bitmap(SkBitmap* bitmap, int width, int height) {
+        bitmap->setConfig(SkBitmap::kARGB_8888_Config, width, height);
+        bitmap->allocPixels();
+        bitmap->eraseColor(0);
+    }
+
+}

tools/picture_utils.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef picture_utils_DEFINED
+#define picture_utils_DEFINED
+#include "SkTypes.h"
+
+class SkBitmap;
+class SkFILEStream;
+class SkString;
+class SkPicture;
+
+namespace sk_tools {
+    // Creates a posix style filepath by concatenating name onto dir with a
+    // forward slash into path.
+    void make_filepath(SkString* path, const char* dir, const SkString& name);
+
+    // Prepares the bitmap so that it can be written.
+    //
+    // Specifically, it configures the bitmap, allocates pixels and then
+    // erases the pixels to transparent black.
+    void setup_bitmap(SkBitmap* bitmap, int width, int height);
+}
+
+#endif  // picture_utils_DEFINED