components/view_manager/gles2/mojo_gpu_memory_buffer.cc

   1 // Copyright 2015 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 "components/view_manager/gles2/mojo_gpu_memory_buffer.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/shared_memory.h"
   9 #include "base/numerics/safe_conversions.h"
  10 #include "ui/gfx/buffer_format_util.h"
  11
  12 namespace gles2 {
  13
  14 MojoGpuMemoryBufferImpl::MojoGpuMemoryBufferImpl(
  15     const gfx::Size& size,
  16     gfx::BufferFormat format,
  17     scoped_ptr<base::SharedMemory> shared_memory)
  18     : size_(size),
  19       format_(format),
  20       shared_memory_(shared_memory.Pass()),
  21       mapped_(false) {}
  22
  23 MojoGpuMemoryBufferImpl::~MojoGpuMemoryBufferImpl() {
  24 }
  25
  26 scoped_ptr<gfx::GpuMemoryBuffer> MojoGpuMemoryBufferImpl::Create(
  27     const gfx::Size& size,
  28     gfx::BufferFormat format,
  29     gfx::BufferUsage usage) {
  30   size_t bytes = gfx::BufferSizeForBufferFormat(size, format);
  31   scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory);
  32   if (!shared_memory->CreateAnonymous(bytes))
  33     return nullptr;
  34   return make_scoped_ptr<gfx::GpuMemoryBuffer>(
  35       new MojoGpuMemoryBufferImpl(size, format, shared_memory.Pass()));
  36 }
  37
  38 MojoGpuMemoryBufferImpl* MojoGpuMemoryBufferImpl::FromClientBuffer(
  39     ClientBuffer buffer) {
  40   return reinterpret_cast<MojoGpuMemoryBufferImpl*>(buffer);
  41 }
  42
  43 const unsigned char* MojoGpuMemoryBufferImpl::GetMemory() const {
  44   return static_cast<const unsigned char*>(shared_memory_->memory());
  45 }
  46
  47 bool MojoGpuMemoryBufferImpl::Map(void** data) {
  48   DCHECK(!mapped_);
  49   if (!shared_memory_->Map(gfx::BufferSizeForBufferFormat(size_, format_)))
  50     return false;
  51   mapped_ = true;
  52   size_t offset = 0;
  53   int num_planes = static_cast<int>(
  54       gfx::NumberOfPlanesForBufferFormat(format_));
  55   for (int i = 0; i < num_planes; ++i) {
  56     data[i] = reinterpret_cast<uint8*>(shared_memory_->memory()) + offset;
  57     offset +=
  58         gfx::RowSizeForBufferFormat(size_.width(), format_, i) *
  59         (size_.height() / gfx::SubsamplingFactorForBufferFormat(format_, i));
  60   }
  61   return true;
  62 }
  63
  64 void MojoGpuMemoryBufferImpl::Unmap() {
  65   DCHECK(mapped_);
  66   shared_memory_->Unmap();
  67   mapped_ = false;
  68 }
  69
  70 bool MojoGpuMemoryBufferImpl::IsMapped() const {
  71   return mapped_;
  72 }
  73
  74 gfx::BufferFormat MojoGpuMemoryBufferImpl::GetFormat() const {
  75   return format_;
  76 }
  77
  78 void MojoGpuMemoryBufferImpl::GetStride(int* stride) const {
  79   int num_planes = static_cast<int>(
  80       gfx::NumberOfPlanesForBufferFormat(format_));
  81   for (int i = 0; i < num_planes; ++i)
  82     stride[i] = base::checked_cast<int>(
  83         gfx::RowSizeForBufferFormat(size_.width(), format_, i));
  84 }
  85
  86 gfx::GpuMemoryBufferId MojoGpuMemoryBufferImpl::GetId() const {
  87   return gfx::GpuMemoryBufferId(0);
  88 }
  89
  90 gfx::GpuMemoryBufferHandle MojoGpuMemoryBufferImpl::GetHandle() const {
  91   gfx::GpuMemoryBufferHandle handle;
  92   handle.type = gfx::SHARED_MEMORY_BUFFER;
  93   handle.handle = shared_memory_->handle();
  94   return handle;
  95 }
  96
  97 ClientBuffer MojoGpuMemoryBufferImpl::AsClientBuffer() {
  98   return reinterpret_cast<ClientBuffer>(this);
  99 }
 100
 101 }  // namespace gles2