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 #include "ui/gfx/buffer_format_util.h"
  10
  11 namespace content {
  12 namespace {
  13
  14 uint32_t LockFlags(gfx::BufferUsage usage) {
  15   switch (usage) {
  16     case gfx::BufferUsage::MAP:
  17       return kIOSurfaceLockAvoidSync;
  18     case gfx::BufferUsage::PERSISTENT_MAP:
  19       return 0;
  20     case gfx::BufferUsage::SCANOUT:
  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     gfx::BufferFormat 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 GpuMemoryBufferImplIOSurface::~GpuMemoryBufferImplIOSurface() {
  41 }
  42
  43 // static
  44 scoped_ptr<GpuMemoryBufferImpl> GpuMemoryBufferImplIOSurface::CreateFromHandle(
  45     const gfx::GpuMemoryBufferHandle& handle,
  46     const gfx::Size& size,
  47     gfx::BufferFormat format,
  48     gfx::BufferUsage 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   size_t num_planes = gfx::NumberOfPlanesForBufferFormat(GetFormat());
  66   for (size_t plane = 0; plane < num_planes; ++plane)
  67     data[plane] = IOSurfaceGetBaseAddressOfPlane(io_surface_, plane);
  68   return true;
  69 }
  70
  71 void GpuMemoryBufferImplIOSurface::Unmap() {
  72   DCHECK(mapped_);
  73   IOSurfaceUnlock(io_surface_, lock_flags_, NULL);
  74   mapped_ = false;
  75 }
  76
  77 void GpuMemoryBufferImplIOSurface::GetStride(int* strides) const {
  78   size_t num_planes = gfx::NumberOfPlanesForBufferFormat(GetFormat());
  79   for (size_t plane = 0; plane < num_planes; ++plane)
  80     strides[plane] = IOSurfaceGetBytesPerRowOfPlane(io_surface_, plane);
  81 }
  82
  83 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplIOSurface::GetHandle() const {
  84   gfx::GpuMemoryBufferHandle handle;
  85   handle.type = gfx::IO_SURFACE_BUFFER;
  86   handle.id = id_;
  87   return handle;
  88 }
  89
  90 }  // namespace content