ui/ozone/platform/drm/gpu/drm_buffer.cc

   1 // Copyright 2014 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 "ui/ozone/platform/drm/gpu/drm_buffer.h"
   6
   7 #include "base/logging.h"
   8 #include "ui/ozone/platform/drm/gpu/drm_device.h"
   9
  10 namespace ui {
  11
  12 namespace {
  13
  14 // Modesetting cannot happen from a buffer with transparencies. Return the size
  15 // of a pixel without alpha.
  16 uint8_t GetColorDepth(SkColorType type) {
  17   switch (type) {
  18     case kUnknown_SkColorType:
  19     case kAlpha_8_SkColorType:
  20       return 0;
  21     case kIndex_8_SkColorType:
  22       return 8;
  23     case kRGB_565_SkColorType:
  24       return 16;
  25     case kARGB_4444_SkColorType:
  26       return 12;
  27     case kN32_SkColorType:
  28       return 24;
  29     default:
  30       NOTREACHED();
  31       return 0;
  32   }
  33 }
  34
  35 }  // namespace
  36
  37 DrmBuffer::DrmBuffer(const scoped_refptr<DrmDevice>& drm)
  38     : drm_(drm),
  39       stride_(0),
  40       handle_(0),
  41       mmap_base_(0),
  42       mmap_size_(0),
  43       framebuffer_(0) {
  44 }
  45
  46 DrmBuffer::~DrmBuffer() {
  47   surface_.clear();
  48
  49   if (framebuffer_ && !drm_->RemoveFramebuffer(framebuffer_))
  50     PLOG(ERROR) << "DrmBuffer: RemoveFramebuffer: fb " << framebuffer_;
  51
  52   if (mmap_base_ && !drm_->UnmapDumbBuffer(mmap_base_, mmap_size_))
  53     PLOG(ERROR) << "DrmBuffer: UnmapDumbBuffer: handle " << handle_;
  54
  55   if (handle_ && !drm_->DestroyDumbBuffer(handle_))
  56     PLOG(ERROR) << "DrmBuffer: DestroyDumbBuffer: handle " << handle_;
  57 }
  58
  59 bool DrmBuffer::Initialize(const SkImageInfo& info,
  60                            bool should_register_framebuffer) {
  61   if (!drm_->CreateDumbBuffer(info, &handle_, &stride_)) {
  62     PLOG(ERROR) << "DrmBuffer: CreateDumbBuffer: width " << info.width()
  63                 << " height " << info.height();
  64     return false;
  65   }
  66
  67   mmap_size_ = info.getSafeSize(stride_);
  68   if (!drm_->MapDumbBuffer(handle_, mmap_size_, &mmap_base_)) {
  69     PLOG(ERROR) << "DrmBuffer: MapDumbBuffer: handle " << handle_;
  70     return false;
  71   }
  72
  73   if (should_register_framebuffer &&
  74       !drm_->AddFramebuffer(
  75           info.width(), info.height(), GetColorDepth(info.colorType()),
  76           info.bytesPerPixel() << 3, stride_, handle_, &framebuffer_)) {
  77     PLOG(ERROR) << "DrmBuffer: AddFramebuffer: handle " << handle_;
  78     return false;
  79   }
  80
  81   surface_ =
  82       skia::AdoptRef(SkSurface::NewRasterDirect(info, mmap_base_, stride_));
  83   if (!surface_) {
  84     LOG(ERROR) << "DrmBuffer: Failed to create SkSurface: handle " << handle_;
  85     return false;
  86   }
  87
  88   return true;
  89 }
  90
  91 SkCanvas* DrmBuffer::GetCanvas() const {
  92   return surface_->getCanvas();
  93 }
  94
  95 uint32_t DrmBuffer::GetFramebufferId() const {
  96   return framebuffer_;
  97 }
  98
  99 uint32_t DrmBuffer::GetHandle() const {
 100   return handle_;
 101 }
 102
 103 gfx::Size DrmBuffer::GetSize() const {
 104   return gfx::Size(surface_->width(), surface_->height());
 105 }
 106
 107 DrmBufferGenerator::DrmBufferGenerator() {
 108 }
 109
 110 DrmBufferGenerator::~DrmBufferGenerator() {
 111 }
 112
 113 scoped_refptr<ScanoutBuffer> DrmBufferGenerator::Create(
 114     const scoped_refptr<DrmDevice>& drm,
 115     const gfx::Size& size) {
 116   scoped_refptr<DrmBuffer> buffer(new DrmBuffer(drm));
 117   SkImageInfo info = SkImageInfo::MakeN32Premul(size.width(), size.height());
 118   if (!buffer->Initialize(info, true /* should_register_framebuffer */))
 119     return NULL;
 120
 121   return buffer;
 122 }
 123
 124 }  // namespace ui