electron/chromium_src/chrome/browser/icon_loader_auralinux.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 "chrome/browser/icon_loader.h"

#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/nix/mime_util_xdg.h"
#include "ui/views/linux_ui/linux_ui.h"

// static
IconLoader::IconGroup IconLoader::GroupForFilepath(
    const base::FilePath& file_path) {
  return base::nix::GetFileMimeType(file_path);
}

// static
scoped_refptr<base::TaskRunner> IconLoader::GetReadIconTaskRunner() {
  // ReadIcon() calls into views::LinuxUI and GTK2 code, so it must be on the UI
  // thread.
  return content::BrowserThread::GetTaskRunnerForThread(
      content::BrowserThread::UI);
}

void IconLoader::ReadIcon() {
  int size_pixels = 0;
  switch (icon_size_) {
    case IconLoader::SMALL:
      size_pixels = 16;
      break;
    case IconLoader::NORMAL:
      size_pixels = 32;
      break;
    case IconLoader::LARGE:
      size_pixels = 48;
      break;
    default:
      NOTREACHED();
  }

  std::unique_ptr<gfx::Image> image;

  views::LinuxUI* ui = views::LinuxUI::instance();
  if (ui) {
    image = std::make_unique<gfx::Image>(
        ui->GetIconForContentType(group_, size_pixels));
    if (image->IsEmpty())
      image = nullptr;
  }

  target_task_runner_->PostTask(
      FROM_HERE, base::BindOnce(callback_, base::Passed(&image), group_));
  delete this;
}