[cc] Add nearest neighbor filtering for TextureLayer.

cc/blink/web_external_texture_layer_impl.cc

 // Copyright 2014 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/blink/web_external_texture_layer_impl.h"
 
 #include "cc/blink/web_external_bitmap_impl.h"
 #include "cc/blink/web_layer_impl.h"
 #include "cc/layers/texture_layer.h"
 #include "cc/resources/resource_update_queue.h"
@@ skipping 44 matching lines @@
 }
 
 void WebExternalTextureLayerImpl::setBlendBackgroundColor(bool blend) {
   static_cast<TextureLayer*>(layer_->layer())->SetBlendBackgroundColor(blend);
 }
 
 void WebExternalTextureLayerImpl::setRateLimitContext(bool rate_limit) {
   static_cast<TextureLayer*>(layer_->layer())->SetRateLimitContext(rate_limit);
 }
 
+void WebExternalTextureLayerImpl::setFilterLevel(
+    SkPaint::FilterLevel filter_level) {
+  static_cast<TextureLayer*>(layer_->layer())
+      ->SetNearestNeighbor(filter_level == SkPaint::kNone_FilterLevel);

[danakj, 2014/11/04 16:02:42]

You have multiple ways of setting nearest neighbour here? Why is that needed?
Isn't doing it through PrepareTextureMailbox enough?

[piman, 2014/11/04 21:14:35]

There's 2 things, that may or may not be in sync:
1- the state that's in the texture
2- how you want the quad to be displayed

This is #2. l.94 is #1.

[danakj, 2014/11/04 21:30:23]

Ah okay, thanks.

+}
+
 bool WebExternalTextureLayerImpl::PrepareTextureMailbox(
     cc::TextureMailbox* mailbox,
     scoped_ptr<cc::SingleReleaseCallback>* release_callback,
     bool use_shared_memory) {
   blink::WebExternalTextureMailbox client_mailbox;
   WebExternalBitmapImpl* bitmap = nullptr;
 
   if (use_shared_memory)
     bitmap = AllocateBitmap();
   if (!client_->prepareMailbox(&client_mailbox, bitmap)) {
     if (bitmap)
       free_bitmaps_.push_back(bitmap);
     return false;
   }
   gpu::Mailbox name;
   name.SetName(client_mailbox.name);
   if (bitmap) {
     *mailbox = cc::TextureMailbox(bitmap->shared_memory(), bitmap->size());
   } else {
     *mailbox =
         cc::TextureMailbox(name, GL_TEXTURE_2D, client_mailbox.syncPoint);
   }
   mailbox->set_allow_overlay(client_mailbox.allowOverlay);
+  mailbox->set_nearest_neighbor(client_mailbox.nearestNeighbor);
 
   if (mailbox->IsValid()) {
     *release_callback = cc::SingleReleaseCallback::Create(
         base::Bind(&WebExternalTextureLayerImpl::DidReleaseMailbox,
                    this->AsWeakPtr(),
                    client_mailbox,
                    bitmap));
   }
 
   return true;
@@ skipping 18 matching lines @@
   DCHECK(layer);
   blink::WebExternalTextureMailbox available_mailbox;
   memcpy(available_mailbox.name, mailbox.name, sizeof(available_mailbox.name));
   available_mailbox.syncPoint = sync_point;
   if (bitmap)
     layer->free_bitmaps_.push_back(bitmap);
   layer->client_->mailboxReleased(available_mailbox, lost_resource);
 }
 
 }  // namespace cc_blink