Lock SkBitmap's pixels before calling SkBitmap::getAddr32.

content/browser/renderer_host/backing_store_gtk.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/renderer_host/backing_store_gtk.h"
 
 #include <cairo-xlib.h>
 #include <gtk/gtk.h>
 #include <stdlib.h>
 #include <sys/ipc.h>
@@ skipping 545 matching lines @@
     else
       XDestroyImage(image);
     return false;
   }
 
   // The X image might have a different row stride, so iterate through
   // it and copy each row out, only up to the pixels we're actually
   // using.  This code assumes a visual mode where a pixel is
   // represented using a 32-bit unsigned int, with a byte per component.
   SkBitmap bitmap = skia::GetTopDevice(*output)->accessBitmap(true);
+  SkAutoLockPixels alp(bitmap);
+
   for (int y = 0; y < height; y++) {
     const uint32* src_row = reinterpret_cast<uint32*>(
         &image->data[image->bytes_per_line * y]);
     uint32* dest_row = bitmap.getAddr32(0, y);
     for (int x = 0; x < width; ++x, ++dest_row) {
       // Force alpha to be 0xff, because otherwise it causes rendering problems.
       *dest_row = src_row[x] | 0xff000000;
     }
   }
 
@@ skipping 81 matching lines @@
 
   cairo_identity_matrix(cr);
 
   cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
   cairo_fill(cr);
   cairo_destroy(cr);
 }
 #endif
 
 }  // namespace content