Use nearest neighbor filtering for non-translated quads

cc/resource_provider.h

 // Copyright 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.
 
 #ifndef CC_RESOURCE_PROVIDER_H_
 #define CC_RESOURCE_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 114 matching lines @@
     // NOTE: if the syncPoint filed in TransferableResourceList is set, this
     // will wait on it.
     void receiveFromChild(int child, const TransferableResourceList&);
 
     // Receives resources from the parent, moving them from mailboxes. Resource IDs
     // passed are in the child namespace.
     // NOTE: if the syncPoint filed in TransferableResourceList is set, this
     // will wait on it.
     void receiveFromParent(const TransferableResourceList&);
 
+    // Bind the given GL resource to a texture target for sampling using the
+    // specified filter for both minification and magnification. The resource
+    // must be locked for reading.
+    void bindForSampling(ResourceProvider::ResourceId, GLenum target, GLenum filter);
+
     // The following lock classes are part of the ResourceProvider API and are
     // needed to read and write the resource contents. The user must ensure
     // that they only use GL locks on GL resources, etc, and this is enforced
     // by assertions.
     class CC_EXPORT ScopedReadLockGL {
     public:
         ScopedReadLockGL(ResourceProvider*, ResourceProvider::ResourceId);
         ~ScopedReadLockGL();
 
         unsigned textureId() const { return m_textureId; }
 
     private:
         ResourceProvider* m_resourceProvider;
         ResourceProvider::ResourceId m_resourceId;
         unsigned m_textureId;
 
         DISALLOW_COPY_AND_ASSIGN(ScopedReadLockGL);
     };
 
+    class CC_EXPORT ScopedSamplerGL : public ScopedReadLockGL {
+    public:
+        ScopedSamplerGL(ResourceProvider*, ResourceProvider::ResourceId, GLenum target, GLenum filter);
+
+    private:
+        DISALLOW_COPY_AND_ASSIGN(ScopedSamplerGL);
+    };
+
     class CC_EXPORT ScopedWriteLockGL {
     public:
         ScopedWriteLockGL(ResourceProvider*, ResourceProvider::ResourceId);
         ~ScopedWriteLockGL();
 
         unsigned textureId() const { return m_textureId; }
 
     private:
         ResourceProvider* m_resourceProvider;
         ResourceProvider::ResourceId m_resourceId;
@@ skipping 41 matching lines @@
     // Map/unmap the acquired pixel buffer.
     uint8_t* mapPixelBuffer(ResourceId id);
     void unmapPixelBuffer(ResourceId id);
 
     // Update pixels from acquired pixel buffer.
     void setPixelsFromBuffer(ResourceId id);
 
 private:
     struct Resource {
         Resource();
-        Resource(unsigned textureId, int pool, const gfx::Size& size, GLenum format);
-        Resource(uint8_t* pixels, int pool, const gfx::Size& size, GLenum format);
+        Resource(unsigned textureId, int pool, const gfx::Size& size, GLenum format, GLenum filter);
+        Resource(uint8_t* pixels, int pool, const gfx::Size& size, GLenum format, GLenum filter);
 
         unsigned glId;
         // Pixel buffer used for set pixels without unnecessary copying.
         unsigned glPixelBufferId;
         Mailbox mailbox;
         uint8_t* pixels;
         uint8_t* pixelBuffer;
         int pool;
         int lockForReadCount;
         bool lockedForWrite;
         bool external;
         bool exported;
         bool markedForDeletion;
         gfx::Size size;
         GLenum format;
+        // TODO(skyostil): Use a separate sampler object for filter state.
+        GLenum filter;
         ResourceType type;
     };
     typedef base::hash_map<ResourceId, Resource> ResourceMap;
     struct Child {
         Child();
         ~Child();
 
         int pool;
         ResourceIdMap childToParentMap;
         ResourceIdMap parentToChildMap;
@@ skipping 27 matching lines @@
     int m_maxTextureSize;
 
     base::ThreadChecker m_threadChecker;
 
     DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };
 
 }
 
 #endif  // CC_RESOURCE_PROVIDER_H_