Support removal of DRI platform

ui/gfx/ozone/impl/dri_skbitmap.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/gfx/ozone/impl/dri_skbitmap.h"
-
-#include <errno.h>
-#include <sys/mman.h>
-#include <sys/types.h>
-#include <xf86drm.h>
-
-#include "base/compiler_specific.h"
-#include "base/logging.h"
-#include "third_party/skia/include/core/SkPixelRef.h"
-
-namespace gfx {
-
-namespace {
-
-void DestroyDumbBuffer(int fd, uint32_t handle) {
-  struct drm_mode_destroy_dumb destroy_request;
-  destroy_request.handle = handle;
-  drmIoctl(fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_request);
-}
-
-// Special DRM implementation of a SkPixelRef. The DRM allocator will create a
-// SkPixelRef for the backing pixels. It will then associate the SkPixelRef with
-// the SkBitmap. SkBitmap will access the allocated memory by locking the pixels
-// in the SkPixelRef.
-// At the end of its life the SkPixelRef is responsible for deallocating the
-// pixel memory.
-class DriSkPixelRef : public SkPixelRef {
- public:
-  DriSkPixelRef(void* pixels,
-                SkColorTable* color_table_,
-                size_t size,
-                int fd,
-                uint32_t handle);
-  virtual ~DriSkPixelRef();
-
-  virtual void* onLockPixels(SkColorTable** ct) OVERRIDE;
-  virtual void onUnlockPixels() OVERRIDE;
-
-  SK_DECLARE_UNFLATTENABLE_OBJECT()
- private:
-  // Raw pointer to the pixel memory.
-  void* pixels_;
-
-  // Optional color table associated with the pixel memory.
-  SkColorTable* color_table_;
-
-  // Size of the allocated memory.
-  size_t size_;
-
-  // File descriptor to the graphics card used to allocate/deallocate the
-  // memory.
-  int fd_;
-
-  // Handle for the allocated memory.
-  uint32_t handle_;
-
-  DISALLOW_COPY_AND_ASSIGN(DriSkPixelRef);
-};
-
-////////////////////////////////////////////////////////////////////////////////
-// DriSkPixelRef implementation
-
-DriSkPixelRef::DriSkPixelRef(
-    void* pixels,
-    SkColorTable* color_table,
-    size_t size,
-    int fd,
-    uint32_t handle)
-  : pixels_(pixels),
-    color_table_(color_table),
-    size_(size),
-    fd_(fd),
-    handle_(handle) {
-}
-
-DriSkPixelRef::~DriSkPixelRef() {
-  munmap(pixels_, size_);
-  DestroyDumbBuffer(fd_, handle_);
-}
-
-void* DriSkPixelRef::onLockPixels(SkColorTable** ct) {
-  *ct = color_table_;
-  return pixels_;
-}
-
-void DriSkPixelRef::onUnlockPixels() {
-}
-
-}  // namespace
-
-// Allocates pixel memory for a SkBitmap using DRM dumb buffers.
-class DriAllocator : public SkBitmap::Allocator {
- public:
-  DriAllocator();
-
-  virtual bool allocPixelRef(SkBitmap* bitmap,
-                             SkColorTable* color_table) OVERRIDE;
-
- private:
-  bool AllocatePixels(DriSkBitmap* bitmap, SkColorTable* color_table);
-
-  DISALLOW_COPY_AND_ASSIGN(DriAllocator);
-};
-
-////////////////////////////////////////////////////////////////////////////////
-// DriAllocator implementation
-
-DriAllocator::DriAllocator() {
-}
-
-bool DriAllocator::allocPixelRef(SkBitmap* bitmap,
-                                 SkColorTable* color_table) {
-  return AllocatePixels(static_cast<DriSkBitmap*>(bitmap), color_table);
-}
-
-bool DriAllocator::AllocatePixels(DriSkBitmap* bitmap,
-                                  SkColorTable* color_table) {
-  struct drm_mode_create_dumb request;
-  request.width = bitmap->width();
-  request.height = bitmap->height();
-  request.bpp = bitmap->bytesPerPixel() << 3;
-  request.flags = 0;
-
-  if (drmIoctl(bitmap->get_fd(), DRM_IOCTL_MODE_CREATE_DUMB, &request) < 0) {
-    DLOG(ERROR) << "Cannot create dumb buffer (" << errno << ") "
-                << strerror(errno);
-    return false;
-  }
-
-  CHECK(request.size == bitmap->getSize());
-
-  bitmap->set_handle(request.handle);
-
-  struct drm_mode_map_dumb map_request;
-  map_request.handle = bitmap->get_handle();
-  if (drmIoctl(bitmap->get_fd(), DRM_IOCTL_MODE_MAP_DUMB, &map_request)) {
-    DLOG(ERROR) << "Cannot prepare dumb buffer for mapping (" << errno << ") "
-                << strerror(errno);
-    DestroyDumbBuffer(bitmap->get_fd(), bitmap->get_handle());
-    return false;
-  }
-
-  void* pixels = mmap(0,
-                      bitmap->getSize(),
-                      PROT_READ | PROT_WRITE,
-                      MAP_SHARED,
-                      bitmap->get_fd(),
-                      map_request.offset);
-  if (pixels == MAP_FAILED) {
-    DLOG(ERROR) << "Cannot mmap dumb buffer (" << errno << ") "
-                << strerror(errno);
-    DestroyDumbBuffer(bitmap->get_fd(), bitmap->get_handle());
-    return false;
-  }
-
-  bitmap->setPixelRef(new DriSkPixelRef(
-      pixels,
-      color_table,
-      bitmap->getSize(),
-      bitmap->get_fd(),
-      bitmap->get_handle()))->unref();
-  bitmap->lockPixels();
-
-  return true;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// DriSkBitmap implementation
-
-DriSkBitmap::DriSkBitmap(int fd)
-  : fd_(fd),
-    handle_(0),
-    framebuffer_(0) {
-}
-
-DriSkBitmap::~DriSkBitmap() {
-}
-
-bool DriSkBitmap::Initialize() {
-  DriAllocator drm_allocator;
-  return allocPixels(&drm_allocator, NULL);
-}
-
-uint8_t DriSkBitmap::GetColorDepth() const {
-  switch (config()) {
-    case SkBitmap::kNo_Config:
-    case SkBitmap::kA1_Config:
-    case SkBitmap::kA8_Config:
-      return 0;
-    case SkBitmap::kIndex8_Config:
-      return 8;
-    case SkBitmap::kRGB_565_Config:
-      return 16;
-    case SkBitmap::kARGB_4444_Config:
-      return 12;
-    case SkBitmap::kARGB_8888_Config:
-      return 24;
-    default:
-      NOTREACHED();
-      return 0;
-  }
-}
-
-}  // namespace gfx