Add multi-planar functions to GpuMemoryBuffer

cc/resources/one_copy_tile_task_worker_pool.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/resources/one_copy_tile_task_worker_pool.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/strings/stringprintf.h"
@@ skipping 303 matching lines @@
   ++scheduled_copy_operation_count_;
 
   // There may be more work available, so wake up another worker thread.
   copy_operation_count_cv_.Signal();
 
   {
     base::AutoUnlock unlock(lock_);
 
     gfx::GpuMemoryBuffer* gpu_memory_buffer = write_lock->GetGpuMemoryBuffer();
     if (gpu_memory_buffer) {
-      TileTaskWorkerPool::PlaybackToMemory(
-          gpu_memory_buffer->Map(), src->format(), src->size(),
-          gpu_memory_buffer->GetStride(), raster_source, rect, scale);
+      size_t num_buffers = gpu_memory_buffer->GetNumberOfPlanes();

[reveman, 2015/03/23 22:24:00]

This code is for contents tile textures. I don't think it makes sense to support
multiple planes here. You can just do something like:

void *data = NULL;
bool rv = gpu_memory_buffer->Map(&data);
CHECK(rv);
uint32 stride;
gpu_memory_buffer->GetStride(&stride);
TileTaskWorkerPool::PlaybackToMemory(data, src->format(), src->size(), stride,
...);
gpu_memory_buffer->Unmap();

[emircan, 2015/03/24 16:52:26]

Done.

+      DCHECK_EQ(num_buffers, 1u);
+
+      void* mapped_buffers[num_buffers];
+      bool map_completed = gpu_memory_buffer->Map(mapped_buffers);
+      DCHECK(map_completed);
+
+      uint32 strides[num_buffers];
+      bool getStride_completed = gpu_memory_buffer->GetStride(strides);
+      DCHECK(getStride_completed);
+
+      TileTaskWorkerPool::PlaybackToMemory(mapped_buffers[0], src->format(),
+                                           src->size(), strides[0],
+                                           raster_source, rect, scale);
       gpu_memory_buffer->Unmap();
     }
   }
 
   pending_copy_operations_.push_back(
       make_scoped_ptr(new CopyOperation(write_lock.Pass(), src.Pass(), dst)));
 
   // Acquire a sequence number for this copy operation.
   CopySequenceNumber sequence = next_copy_operation_sequence_++;
 
@@ skipping 161 matching lines @@
                             resource_pool_->total_memory_usage_bytes());
   staging_state->SetInteger("pending_copy_count",
                             resource_pool_->total_resource_count() -
                                 resource_pool_->acquired_resource_count());
   staging_state->SetInteger("bytes_pending_copy",
                             resource_pool_->total_memory_usage_bytes() -
                                 resource_pool_->acquired_memory_usage_bytes());
 }
 
 }  // namespace cc