cc: Partial tile update for one-copy raster.

content/browser/gpu/compositor_util.h

 // Copyright 2013 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 CONTENT_BROWSER_GPU_COMPOSITOR_UTIL_H_
 #define CONTENT_BROWSER_GPU_COMPOSITOR_UTIL_H_
 
 #include "base/values.h"
 #include "content/common/content_export.h"
 
@@ skipping 14 matching lines @@
 CONTENT_EXPORT bool IsDelegatedRendererEnabled();
 
 // Returns true if impl-side painting is on (via flags, or platform default)
 // for the renderer.
 CONTENT_EXPORT bool IsImplSidePaintingEnabled();
 
 // Returns true if one-copy uploads is on (via flags, or platform default).
 // Only one of one-copy and zero-copy can be enabled at a time.
 CONTENT_EXPORT bool IsOneCopyUploadEnabled();
 
+// Returns true if the GpuMemoryBuffer implementation used by the compositor
+// supports persistent contents across maps.
+CONTENT_EXPORT bool HavePersistentGpuMemoryBuffers();

[reveman, 2015/05/22 17:15:13]

I'm not sure the name of this function makes sense. We can always support it as
we have a shmem fallback. --enable-native-gpu-memory-buffers doesn't mean that
that native type is the only implementation used. It means that we'll use it if
supported by the format and usage requested.

I think IsPersistentMapGpuMemoryBufferUsageEnabled() would be more appropriate
as the implementation of this function answers the question of whether we should
use persistent map or not.

[danakj, 2015/05/26 19:02:52]

okay~

[danakj, 2015/05/26 23:37:34]

Done.

+
 // Returns true if zero-copy uploads is on (via flags, or platform default).
 // Only one of one-copy and zero-copy can be enabled at a time.
 CONTENT_EXPORT bool IsZeroCopyUploadEnabled();
 
 // Returns true if gpu rasterization is on (via flags) for the renderer.
 CONTENT_EXPORT bool IsGpuRasterizationEnabled();
 
 // Returns the number of multisample antialiasing samples (via flags) for
 // GPU rasterization.
 CONTENT_EXPORT int GpuRasterizationMSAASampleCount();
 
 // Returns true if force-gpu-rasterization is on (via flags) for the renderer.
 CONTENT_EXPORT bool IsForceGpuRasterizationEnabled();
 
 // Returns the number of raster threads to use for compositing.
 CONTENT_EXPORT int NumberOfRendererRasterThreads();
 
 // Returns true if using cc Surfaces is allowed.
 CONTENT_EXPORT bool UseSurfacesEnabled();
 
 CONTENT_EXPORT base::DictionaryValue* GetFeatureStatus();
 CONTENT_EXPORT base::Value* GetProblems();
 CONTENT_EXPORT std::vector<std::string> GetDriverBugWorkarounds();
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_COMPOSITOR_UTIL_H_