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       NOTREACHED();
  21       return 0;
  22   }
  23   NOTREACHED();
  24   return 0;
  25 }
  26
  27 }  // namespace
  28
  29 GpuMemoryBufferImplIOSurface::GpuMemoryBufferImplIOSurface(
  30     gfx::GpuMemoryBufferId id,
  31     const gfx::Size& size,
  32     Format format,
  33     const DestructionCallback& callback,
  34     IOSurfaceRef io_surface,
  35     uint32_t lock_flags)
  36     : GpuMemoryBufferImpl(id, size, format, callback),
  37       io_surface_(io_surface),
  38       lock_flags_(lock_flags) {
  39 }
  40
  41 GpuMemoryBufferImplIOSurface::~GpuMemoryBufferImplIOSurface() {
  42 }
  43
  44 // static
  45 scoped_ptr<GpuMemoryBufferImpl> GpuMemoryBufferImplIOSurface::CreateFromHandle(
  46     const gfx::GpuMemoryBufferHandle& handle,
  47     const gfx::Size& size,
  48     Format format,
  49     Usage usage,
  50     const DestructionCallback& callback) {
  51   base::ScopedCFTypeRef<IOSurfaceRef> io_surface(
  52       IOSurfaceManager::GetInstance()->AcquireIOSurface(handle.id));
  53   if (!io_surface)
  54     return nullptr;
  55
  56   return make_scoped_ptr<GpuMemoryBufferImpl>(
  57       new GpuMemoryBufferImplIOSurface(handle.id, size, format, callback,
  58                                        io_surface.release(), LockFlags(usage)));
  59 }
  60
  61 bool GpuMemoryBufferImplIOSurface::Map(void** data) {
  62   DCHECK(!mapped_);
  63   IOReturn status = IOSurfaceLock(io_surface_, lock_flags_, NULL);
  64   DCHECK_NE(status, kIOReturnCannotLock);
  65   mapped_ = true;
  66   *data = IOSurfaceGetBaseAddress(io_surface_);
  67   return true;
  68 }
  69
  70 void GpuMemoryBufferImplIOSurface::Unmap() {
  71   DCHECK(mapped_);
  72   IOSurfaceUnlock(io_surface_, lock_flags_, NULL);
  73   mapped_ = false;
  74 }
  75
  76 void GpuMemoryBufferImplIOSurface::GetStride(int* stride) const {
  77   *stride = IOSurfaceGetBytesPerRow(io_surface_);
  78 }
  79
  80 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplIOSurface::GetHandle() const {
  81   gfx::GpuMemoryBufferHandle handle;
  82   handle.type = gfx::IO_SURFACE_BUFFER;
  83   handle.id = id_;
  84   return handle;
  85 }
  86
  87 }  // namespace content