SkBitmap and SkPixelRef no longer need lock/unlock

ui/gfx/codec/png_codec.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_CODEC_PNG_CODEC_H_
 #define UI_GFX_CODEC_PNG_CODEC_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 65 matching lines @@
                      ColorFormat format,
                      const Size& size,
                      int row_byte_width,
                      bool discard_transparency,
                      const std::vector<Comment>& comments,
                      std::vector<unsigned char>* output);
 
   // Call PNGCodec::Encode on the supplied SkBitmap |input|, which is assumed
   // to be kARGB_8888_Config, 32 bits per pixel. The params
   // |discard_transparency| and |output| are passed directly to Encode; refer to
-  // Encode for more information. During the call, an SkAutoLockPixels lock
-  // is held on |input|.
+  // Encode for more information.
   static bool EncodeBGRASkBitmap(const SkBitmap& input,
                                  bool discard_transparency,
                                  std::vector<unsigned char>* output);
 
   // Call PNGCodec::Encode on the supplied SkBitmap |input|. The difference
   // between this and the previous method is that this restricts compression to
   // zlib q1, which is just rle encoding.
   static bool FastEncodeBGRASkBitmap(const SkBitmap& input,
                                      bool discard_transparency,
                                      std::vector<unsigned char>* output);
 
   // Call PNGCodec::Encode on the supplied SkBitmap |input|, which is assumed
   // to be kA8_Config, 8 bits per pixel. The bitmap is encoded as a grayscale
   // PNG with alpha used for color intensity. The |output| param is passed
-  // directly to Encode; refer to Encode for more information. During the call,
-  // an SkAutoLockPixels lock is held on |input|.
+  // directly to Encode; refer to Encode for more information.
   static bool EncodeA8SkBitmap(const SkBitmap& input,
                                std::vector<unsigned char>* output);
 
   // Decodes the PNG data contained in input of length input_size. The
   // decoded data will be placed in *output with the dimensions in *w and *h
   // on success (returns true). This data will be written in the 'format'
   // format. On failure, the values of these output variables are undefined.
   //
   // This function may not support all PNG types, and it hasn't been tested
   // with a large number of images, so assume a new format may not work. It's
@@ skipping 13 matching lines @@
   static bool Decode(const unsigned char* input, size_t input_size,
                      SkBitmap* bitmap);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PNGCodec);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_CODEC_PNG_CODEC_H_