content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc

   1 // Copyright 2013 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 "content/common/gpu/client/gpu_memory_buffer_impl_io_surface.h"
   6
   7 #include "base/logging.h"
   8 #include "content/common/mac/io_surface_manager.h"
   9
  10 namespace content {
  11 namespace {
  12
  13 uint32_t LockFlags(gfx::BufferUsage usage) {
  14   switch (usage) {
  15     case gfx::BufferUsage::MAP:
  16       return kIOSurfaceLockAvoidSync;
  17     case gfx::BufferUsage::PERSISTENT_MAP:
  18       return 0;
  19     case gfx::BufferUsage::SCANOUT:
  20       return 0;
  21   }
  22   NOTREACHED();
  23   return 0;
  24 }
  25
  26 }  // namespace
  27
  28 GpuMemoryBufferImplIOSurface::GpuMemoryBufferImplIOSurface(
  29     gfx::GpuMemoryBufferId id,
  30     const gfx::Size& size,
  31     gfx::BufferFormat format,
  32     const DestructionCallback& callback,
  33     IOSurfaceRef io_surface,
  34     uint32_t lock_flags)
  35     : GpuMemoryBufferImpl(id, size, format, callback),
  36       io_surface_(io_surface),
  37       lock_flags_(lock_flags) {}
  38
  39 GpuMemoryBufferImplIOSurface::~GpuMemoryBufferImplIOSurface() {
  40 }
  41
  42 // static
  43 scoped_ptr<GpuMemoryBufferImpl> GpuMemoryBufferImplIOSurface::CreateFromHandle(
  44     const gfx::GpuMemoryBufferHandle& handle,
  45     const gfx::Size& size,
  46     gfx::BufferFormat format,
  47     gfx::BufferUsage usage,
  48     const DestructionCallback& callback) {
  49   base::ScopedCFTypeRef<IOSurfaceRef> io_surface(
  50       IOSurfaceManager::GetInstance()->AcquireIOSurface(handle.id));
  51   if (!io_surface)
  52     return nullptr;
  53
  54   return make_scoped_ptr<GpuMemoryBufferImpl>(
  55       new GpuMemoryBufferImplIOSurface(handle.id, size, format, callback,
  56                                        io_surface.release(), LockFlags(usage)));
  57 }
  58
  59 bool GpuMemoryBufferImplIOSurface::Map(void** data) {
  60   DCHECK(!mapped_);
  61   IOReturn status = IOSurfaceLock(io_surface_, lock_flags_, NULL);
  62   DCHECK_NE(status, kIOReturnCannotLock);
  63   mapped_ = true;
  64   *data = IOSurfaceGetBaseAddress(io_surface_);
  65   return true;
  66 }
  67
  68 void GpuMemoryBufferImplIOSurface::Unmap() {
  69   DCHECK(mapped_);
  70   IOSurfaceUnlock(io_surface_, lock_flags_, NULL);
  71   mapped_ = false;
  72 }
  73
  74 void GpuMemoryBufferImplIOSurface::GetStride(int* stride) const {
  75   *stride = IOSurfaceGetBytesPerRow(io_surface_);
  76 }
  77
  78 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplIOSurface::GetHandle() const {
  79   gfx::GpuMemoryBufferHandle handle;
  80   handle.type = gfx::IO_SURFACE_BUFFER;
  81   handle.id = id_;
  82   return handle;
  83 }
  84
  85 }  // namespace content