SkBitmap and SkPixelRef no longer need lock/unlock

cc/trees/layer_tree_host_impl.cc

 // Copyright 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.
 
 #include "cc/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 3883 matching lines @@
     float scale = static_cast<float>(max_texture_size - 1) / edge;
     DCHECK_LT(scale, 1.f);
     upload_size = gfx::ScaleToCeiledSize(source_size, scale, scale);
   }
 
   id = resource_provider_->CreateResource(
       upload_size, ResourceProvider::TEXTURE_HINT_IMMUTABLE, format,
       gfx::ColorSpace::CreateSRGB());
 
   if (!scaled) {
-    AutoLockUIResourceBitmap bitmap_lock(bitmap);
-    auto* pixels = bitmap_lock.GetPixels();
-    resource_provider_->CopyToResource(id, pixels, source_size);
+    resource_provider_->CopyToResource(id, bitmap.GetPixels(), source_size);
   } else {
     // Only support auto-resizing for N32 textures (since this is primarily for
     // scrollbars). Users of other types need to ensure they are not too big.
     DCHECK_EQ(bitmap.GetFormat(), UIResourceBitmap::RGBA8);
 
     float canvas_scale_x =
         upload_size.width() / static_cast<float>(source_size.width());
     float canvas_scale_y =
         upload_size.height() / static_cast<float>(source_size.height());
 
     // Uses kPremul_SkAlphaType since that is what SkBitmap's allocN32Pixels
     // makes, and we only support the RGBA8 format here.
     SkImageInfo info = SkImageInfo::MakeN32(
         source_size.width(), source_size.height(), kPremul_SkAlphaType);
     int row_bytes = source_size.width() * 4;
 
-    AutoLockUIResourceBitmap bitmap_lock(bitmap);
     SkBitmap source_bitmap;
     source_bitmap.setInfo(info, row_bytes);
-    source_bitmap.setPixels(const_cast<uint8_t*>(bitmap_lock.GetPixels()));
+    source_bitmap.setPixels(const_cast<uint8_t*>(bitmap.GetPixels()));
 
     // This applies the scale to draw the |bitmap| into |scaled_bitmap|.
     SkBitmap scaled_bitmap;
     scaled_bitmap.allocN32Pixels(upload_size.width(), upload_size.height());
     SkCanvas scaled_canvas(scaled_bitmap);
     scaled_canvas.scale(canvas_scale_x, canvas_scale_y);
     // The |canvas_scale_x| and |canvas_scale_y| may have some floating point
     // error for large enough values, causing pixels on the edge to be not
     // fully filled by drawBitmap(), so we ensure they start empty. (See
     // crbug.com/642011 for an example.)
     scaled_canvas.clear(SK_ColorTRANSPARENT);
     scaled_canvas.drawBitmap(source_bitmap, 0, 0);
 
-    SkAutoLockPixels scaled_bitmap_lock(scaled_bitmap);
     auto* pixels = static_cast<uint8_t*>(scaled_bitmap.getPixels());
     resource_provider_->CopyToResource(id, pixels, upload_size);
   }
 
   UIResourceData data;
   data.resource_id = id;
   data.opaque = bitmap.GetOpaque();
   ui_resource_map_[uid] = data;
 
   resource_provider_->GenerateSyncTokenForResource(id);
@@ skipping 348 matching lines @@
 }
 
 void LayerTreeHostImpl::UpdateScrollSourceInfo(bool is_wheel_scroll) {
   if (is_wheel_scroll)
     has_scrolled_by_wheel_ = true;
   else
     has_scrolled_by_touch_ = true;
 }
 
 }  // namespace cc