gpu/command_buffer/common/buffer.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "gpu/command_buffer/common/buffer.h"
   6
   7 #include "base/format_macros.h"
   8 #include "base/logging.h"
   9 #include "base/numerics/safe_math.h"
  10 #include "base/strings/stringprintf.h"
  11
  12 namespace gpu {
  13 SharedMemoryBufferBacking::SharedMemoryBufferBacking(
  14     scoped_ptr<base::SharedMemory> shared_memory,
  15     size_t size)
  16     : shared_memory_(shared_memory.Pass()), size_(size) {}
  17
  18 SharedMemoryBufferBacking::~SharedMemoryBufferBacking() {}
  19
  20 void* SharedMemoryBufferBacking::GetMemory() const {
  21   return shared_memory_->memory();
  22 }
  23
  24 size_t SharedMemoryBufferBacking::GetSize() const { return size_; }
  25
  26 Buffer::Buffer(scoped_ptr<BufferBacking> backing)
  27     : backing_(backing.Pass()),
  28       memory_(backing_->GetMemory()),
  29       size_(backing_->GetSize()) {
  30   DCHECK(memory_) << "The memory must be mapped to create a Buffer";
  31 }
  32
  33 Buffer::~Buffer() {}
  34
  35 void* Buffer::GetDataAddress(uint32 data_offset, uint32 data_size) const {
  36   base::CheckedNumeric<uint32> end = data_offset;
  37   end += data_size;
  38   if (!end.IsValid() || end.ValueOrDie() > static_cast<uint32>(size_))
  39     return NULL;
  40   return static_cast<uint8*>(memory_) + data_offset;
  41 }
  42
  43 base::trace_event::MemoryAllocatorDumpGuid GetBufferGUIDForTracing(
  44     uint64_t tracing_process_id,
  45     int32_t buffer_id) {
  46   return base::trace_event::MemoryAllocatorDumpGuid(base::StringPrintf(
  47       "gpu-buffer-x-process/%" PRIx64 "/%d", tracing_process_id, buffer_id));
  48 }
  49
  50 } // namespace gpu