Add multi-planar functions to GpuMemoryBuffer

content/common/gpu/client/gpu_memory_buffer_impl.cc

 // 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.
 
 #include "content/common/gpu/client/gpu_memory_buffer_impl.h"
 
 #include "base/logging.h"
 #include "base/numerics/safe_math.h"
 #include "content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.h"
 #include "ui/gl/gl_bindings.h"
@@ skipping 93 matching lines @@
         return false;
 
       *stride_in_bytes = s.ValueOrDie();
       return true;
   }
 
   NOTREACHED();
   return false;
 }
 
+// static
+size_t GpuMemoryBufferImpl::NumberOfPlanesForGpuMemoryBufferFormat(
+    gfx::GpuMemoryBuffer::Format format) {
+  switch (format) {
+    case gfx::GpuMemoryBuffer::Format::ATC:
+    case gfx::GpuMemoryBuffer::Format::ATCIA:
+    case gfx::GpuMemoryBuffer::Format::DXT1:
+    case gfx::GpuMemoryBuffer::Format::DXT5:
+    case gfx::GpuMemoryBuffer::Format::ETC1:
+    case gfx::GpuMemoryBuffer::Format::RGBA_8888:
+    case gfx::GpuMemoryBuffer::Format::RGBX_8888:
+    case gfx::GpuMemoryBuffer::Format::BGRA_8888:
+      return 1;
+    default:
+      NOTREACHED();
+      return 0;
+  }
+}
+
 gfx::GpuMemoryBuffer::Format GpuMemoryBufferImpl::GetFormat() const {
   return format_;
 }
 
 bool GpuMemoryBufferImpl::IsMapped() const {
   return mapped_;
 }
 
 ClientBuffer GpuMemoryBufferImpl::AsClientBuffer() {
   return reinterpret_cast<ClientBuffer>(this);
 }
 
 }  // namespace content