ui/ozone/platform/dri/dri_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/dri/dri_buffer.h"
   6
   7 #include "base/logging.h"
   8 #include "ui/ozone/platform/dri/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 DriBuffer::DriBuffer(const scoped_refptr<DrmDevice>& drm)
  38     : drm_(drm), handle_(0), framebuffer_(0) {
  39 }
  40
  41 DriBuffer::~DriBuffer() {
  42   if (!surface_)
  43     return;
  44
  45   if (framebuffer_)
  46     drm_->RemoveFramebuffer(framebuffer_);
  47
  48   SkImageInfo info;
  49   void* pixels = const_cast<void*>(surface_->peekPixels(&info, NULL));
  50   if (!pixels)
  51     return;
  52
  53   drm_->DestroyDumbBuffer(info, handle_, stride_, pixels);
  54 }
  55
  56 bool DriBuffer::Initialize(const SkImageInfo& info,
  57                            bool should_register_framebuffer) {
  58   void* pixels = NULL;
  59   if (!drm_->CreateDumbBuffer(info, &handle_, &stride_, &pixels)) {
  60     VLOG(2) << "Cannot create drm dumb buffer";
  61     return false;
  62   }
  63
  64   if (should_register_framebuffer &&
  65       !drm_->AddFramebuffer(
  66           info.width(), info.height(), GetColorDepth(info.colorType()),
  67           info.bytesPerPixel() << 3, stride_, handle_, &framebuffer_)) {
  68     VLOG(2) << "Failed to register framebuffer: " << strerror(errno);
  69     return false;
  70   }
  71
  72   surface_ = skia::AdoptRef(SkSurface::NewRasterDirect(info, pixels, stride_));
  73   if (!surface_) {
  74     VLOG(2) << "Cannot install Skia pixels for drm buffer";
  75     return false;
  76   }
  77
  78   return true;
  79 }
  80
  81 SkCanvas* DriBuffer::GetCanvas() const {
  82   return surface_->getCanvas();
  83 }
  84
  85 uint32_t DriBuffer::GetFramebufferId() const {
  86   return framebuffer_;
  87 }
  88
  89 uint32_t DriBuffer::GetHandle() const {
  90   return handle_;
  91 }
  92
  93 gfx::Size DriBuffer::GetSize() const {
  94   return gfx::Size(surface_->width(), surface_->height());
  95 }
  96
  97 DriBufferGenerator::DriBufferGenerator() {
  98 }
  99
 100 DriBufferGenerator::~DriBufferGenerator() {}
 101
 102 scoped_refptr<ScanoutBuffer> DriBufferGenerator::Create(
 103     const scoped_refptr<DrmDevice>& drm,
 104     const gfx::Size& size) {
 105   scoped_refptr<DriBuffer> buffer(new DriBuffer(drm));
 106   SkImageInfo info = SkImageInfo::MakeN32Premul(size.width(), size.height());
 107   if (!buffer->Initialize(info, true /* should_register_framebuffer */))
 108     return NULL;
 109
 110   return buffer;
 111 }
 112
 113 }  // namespace ui