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::GpuMemoryBuffer::Usage usage) {
  14   switch (usage) {
  15     case gfx::GpuMemoryBuffer::MAP:
  16       return kIOSurfaceLockAvoidSync;
  17     case gfx::GpuMemoryBuffer::PERSISTENT_MAP:
  18       return 0;
  19     case gfx::GpuMemoryBuffer::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     Format 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
  40 GpuMemoryBufferImplIOSurface::~GpuMemoryBufferImplIOSurface() {
  41 }
  42
  43 // static
  44 scoped_ptr<GpuMemoryBufferImpl> GpuMemoryBufferImplIOSurface::CreateFromHandle(
  45     const gfx::GpuMemoryBufferHandle& handle,
  46     const gfx::Size& size,
  47     Format format,
  48     Usage usage,
  49     const DestructionCallback& callback) {
  50   base::ScopedCFTypeRef<IOSurfaceRef> io_surface(
  51       IOSurfaceManager::GetInstance()->AcquireIOSurface(handle.id));
  52   if (!io_surface)
  53     return nullptr;
  54
  55   return make_scoped_ptr<GpuMemoryBufferImpl>(
  56       new GpuMemoryBufferImplIOSurface(handle.id, size, format, callback,
  57                                        io_surface.release(), LockFlags(usage)));
  58 }
  59
  60 bool GpuMemoryBufferImplIOSurface::Map(void** data) {
  61   DCHECK(!mapped_);
  62   IOReturn status = IOSurfaceLock(io_surface_, lock_flags_, NULL);
  63   DCHECK_NE(status, kIOReturnCannotLock);
  64   mapped_ = true;
  65   *data = IOSurfaceGetBaseAddress(io_surface_);
  66   return true;
  67 }
  68
  69 void GpuMemoryBufferImplIOSurface::Unmap() {
  70   DCHECK(mapped_);
  71   IOSurfaceUnlock(io_surface_, lock_flags_, NULL);
  72   mapped_ = false;
  73 }
  74
  75 void GpuMemoryBufferImplIOSurface::GetStride(int* stride) const {
  76   *stride = IOSurfaceGetBytesPerRow(io_surface_);
  77 }
  78
  79 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplIOSurface::GetHandle() const {
  80   gfx::GpuMemoryBufferHandle handle;
  81   handle.type = gfx::IO_SURFACE_BUFFER;
  82   handle.id = id_;
  83   return handle;
  84 }
  85
  86 }  // namespace content