Linux: server side backing stores

chrome/browser/renderer_host/backing_store.cc

 // Copyright (c) 2006-2008 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 "chrome/browser/renderer_host/backing_store.h"
 
-class RenderWidgetHost;
+#include "chrome/browser/renderer_host/render_widget_host.h"
 
 namespace {
 
 typedef OwningMRUCache<RenderWidgetHost*, BackingStore*> BackingStoreCache;
 static BackingStoreCache* cache = NULL;
 
 // Returns the size of the backing store cache.
 // TODO(iyengar) Make this dynamic, i.e. based on the available resources
 // on the machine.
 static int GetBackingStoreCacheSize() {
   const int kMaxSize = 5;
   return kMaxSize;
 }
 
 // Creates the backing store for the host based on the dimensions passed in.
 // Removes the existing backing store if there is one.
 BackingStore* CreateBackingStore(RenderWidgetHost* host,
-                                 const gfx::Rect& backing_store_rect) {
+                                 const gfx::Size& backing_store_size) {
   BackingStoreManager::RemoveBackingStore(host);
 
-  BackingStore* backing_store = new BackingStore(backing_store_rect.size());
+  BackingStore* backing_store = host->AllocBackingStore(backing_store_size);
   int backing_store_cache_size = GetBackingStoreCacheSize();
   if (backing_store_cache_size > 0) {
     if (!cache)
       cache = new BackingStoreCache(backing_store_cache_size);
     cache->Put(host, backing_store);
   }
   return backing_store;
 }
 
 }  // namespace
@@ skipping 12 matching lines @@
       return backing_store;
     backing_store = NULL;
   }
 
   return backing_store;
 }
 
 // static
 BackingStore* BackingStoreManager::PrepareBackingStore(
     RenderWidgetHost* host,
-    const gfx::Rect& backing_store_rect,
+    const gfx::Size& backing_store_size,
     base::ProcessHandle process_handle,
     TransportDIB* bitmap,
     const gfx::Rect& bitmap_rect,
     bool* needs_full_paint) {
-  BackingStore* backing_store = GetBackingStore(host,
-                                                backing_store_rect.size());
+  BackingStore* backing_store = GetBackingStore(host, backing_store_size);
   if (!backing_store) {
     // We need to get Webkit to generate a new paint here, as we
     // don't have a previous snapshot.
-    if (bitmap_rect != backing_store_rect) {
+    if (bitmap_rect.size() != backing_store_size ||
+        bitmap_rect.x() != 0 || bitmap_rect.y() != 0) {
       DCHECK(needs_full_paint != NULL);
       *needs_full_paint = true;
     }
-    backing_store = CreateBackingStore(host, backing_store_rect);
+    backing_store = CreateBackingStore(host, backing_store_size);
   }
 
   DCHECK(backing_store != NULL);
   backing_store->PaintRect(process_handle, bitmap, bitmap_rect);
   return backing_store;
 }
 
 // static
 BackingStore* BackingStoreManager::Lookup(RenderWidgetHost* host) {
   if (cache) {
@@ skipping 13 matching lines @@
   if (it == cache->end())
     return;
 
   cache->Erase(it);
 
   if (cache->empty()) {
     delete cache;
     cache = NULL;
   }
 }