Icon Capture Utility For Linux, Windows and Mac

chrome/browser/media/window_icon_util_mac.mm

+// Copyright 2016 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/media/window_icon_util.h"
+
+#include <ApplicationServices/ApplicationServices.h>
+#include <Cocoa/Cocoa.h>
+#include <CoreFoundation/CoreFoundation.h>
+
+#include "third_party/libyuv/include/libyuv/convert_argb.h"
+
+gfx::ImageSkia WindowIconUtil::GetWindowIcon(content::DesktopMediaID id) {
+  CGWindowID ids[1];
+  ids[0] = id.id;
+  CFArrayRef window_id_array =
+      CFArrayCreate(nullptr, reinterpret_cast<const void**>(&ids), 1, nullptr);
+  CFArrayRef window_array =
+      CGWindowListCreateDescriptionFromArray(window_id_array);
+  if (!window_array || 0 == CFArrayGetCount(window_array)) {
+    return gfx::ImageSkia();
+  }
+
+  CFDictionaryRef window = reinterpret_cast<CFDictionaryRef>(
+      CFArrayGetValueAtIndex(window_array, 0));
+  CFNumberRef pid_ref = reinterpret_cast<CFNumberRef>(
+      CFDictionaryGetValue(window, kCGWindowOwnerPID));
+
+  int pid;
+  CFNumberGetValue(pid_ref, kCFNumberIntType, &pid);
+
+  NSImage* icon_image =
+      [[NSRunningApplication runningApplicationWithProcessIdentifier:pid] icon];
+
+  int width = [icon_image size].width;
+  int height = [icon_image size].height;
+
+  CGImageRef cg_icon_image =
+      [icon_image CGImageForProposedRect:nil context:nil hints:nil];
+
+  int bits_per_pixel = CGImageGetBitsPerPixel(cg_icon_image);
+  if (bits_per_pixel != 32) {
+    return gfx::ImageSkia();
+  }
+
+  CGDataProviderRef provider = CGImageGetDataProvider(cg_icon_image);
+  CFDataRef cf_data = CGDataProviderCopyData(provider);
+
+  int src_stride = CGImageGetBytesPerRow(cg_icon_image);
+  const uint8_t* src_data = CFDataGetBytePtr(cf_data);
+
+  SkBitmap result;
+  result.allocN32Pixels(width, height, false);
+  result.lockPixels();
+
+  uint8_t* pixels_data = reinterpret_cast<uint8_t*>(result.getPixels());
+
+  libyuv::ABGRToARGB(src_data, src_stride, pixels_data, result.rowBytes(),
+                     width, height);
+
+  CFRelease(cf_data);
+
+  return gfx::ImageSkia::CreateFrom1xBitmap(result);
+}