SkBitmap and SkPixelRef no longer need lock/unlock

third_party/WebKit/Source/platform/image-decoders/ImageFrame.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008, 2009 Google, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 30 matching lines @@
       alpha_blend_source_(kBlendAtopPreviousFrame),
       premultiply_alpha_(true),
       pixels_changed_(false),
       required_previous_frame_index_(kNotFound) {}
 
 ImageFrame& ImageFrame::operator=(const ImageFrame& other) {
   if (this == &other)
     return *this;
 
   bitmap_ = other.bitmap_;
-  // Keep the pixels locked since we will be writing directly into the
-  // bitmap throughout this object's lifetime.
-  bitmap_.lockPixels();
   // Be sure to assign this before calling setStatus(), since setStatus() may
   // call notifyBitmapIfPixelsChanged().
   pixels_changed_ = other.pixels_changed_;
   SetMemoryAllocator(other.GetAllocator());
   SetOriginalFrameRect(other.OriginalFrameRect());
   SetStatus(other.GetStatus());
   SetDuration(other.Duration());
   SetDisposalMethod(other.GetDisposalMethod());
   SetAlphaBlendSource(other.GetAlphaBlendSource());
   SetPremultiplyAlpha(other.PremultiplyAlpha());
@@ skipping 138 matching lines @@
   // If the frame is not fully loaded, there will be transparent pixels,
   // so we can't tell skia we're opaque, even for image types that logically
   // always are (e.g. jpeg).
   if (!has_alpha_ && status_ == kFrameComplete)
     return kOpaque_SkAlphaType;
 
   return premultiply_alpha_ ? kPremul_SkAlphaType : kUnpremul_SkAlphaType;
 }
 
 }  // namespace blink