Simplify some old avatar menu button code.

chrome/browser/ui/views/profiles/profile_indicator_icon.cc

+// 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/ui/views/profiles/profile_indicator_icon.h"
+
+#include "chrome/browser/profiles/profile_avatar_icon_util.h"
+#include "ui/gfx/canvas.h"
+
+ProfileIndicatorIcon::ProfileIndicatorIcon() : old_height_(0) {
+  // In RTL mode, the incognito icon should be looking the opposite direction.
+  EnableCanvasFlippingForRTLUI(true);
+}
+
+ProfileIndicatorIcon::~ProfileIndicatorIcon() {}
+
+void ProfileIndicatorIcon::OnPaint(gfx::Canvas* canvas) {
+  if (base_icon_.IsEmpty())
+    return;
+
+  if (old_height_ != height() || modified_icon_.isNull()) {
+    old_height_ = height();
+    modified_icon_ = *profiles::GetAvatarIconForTitleBar(base_icon_, false,
+                                                         width(), height())
+                          .ToImageSkia();
+  }
+
+  // Scale the image to fit the width of the button.
+  int dst_width = std::min(modified_icon_.width(), width());
+  // Truncate rather than rounding, so that for odd widths we put the extra
+  // pixel on the left.
+  int dst_x = (width() - dst_width) / 2;
+
+  // Scale the height and maintain aspect ratio. This means that the
+  // icon may not fit in the view. That's ok, we just vertically center it.
+  float scale = static_cast<float>(dst_width) /
+                static_cast<float>(modified_icon_.width());
+  // Round here so that we minimize the aspect ratio drift.
+  int dst_height = std::round(modified_icon_.height() * scale);
+  // Round rather than truncating, so that for odd heights we select an extra
+  // pixel below the image center rather than above.  This is because the
+  // incognito image has shadows at the top that make the apparent center below
+  // the real center.
+  int dst_y = std::round((height() - dst_height) / 2.0f);
+  canvas->DrawImageInt(modified_icon_, 0, 0, modified_icon_.width(),
+                       modified_icon_.height(), dst_x, dst_y, dst_width,
+                       dst_height, false);
+}
+
+void ProfileIndicatorIcon::SetIcon(const gfx::Image& icon) {
+  base_icon_ = icon;
+  modified_icon_ = gfx::ImageSkia();
+  SchedulePaint();
+}