Message center re-organized

ui/views/shadow_border.cc

+// Copyright (c) 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/views/shadow_border.h"
+
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/insets.h"
+#include "ui/gfx/shadow_value.h"
+#include "ui/gfx/skia_util.h"
+
+namespace views {
+
+ShadowBorder::ShadowBorder(int blur,
+                           SkColor color,
+                           int vertical_offset,
+                           int horizontal_offset)
+    : views::Border(),
+      blur_(blur),
+      color_(color),
+      vertical_offset_(vertical_offset),
+      horizontal_offset_(horizontal_offset) {}
+
+ShadowBorder::~ShadowBorder() {}
+
+void ShadowBorder::Paint(const views::View& view, gfx::Canvas* canvas) {
+  SkPaint paint;

[msw, 2013/07/13 01:21:36]

Re-painting a shadow looper on every paint call may yield poor performance. This
border's appearance should probably be shipped in image assets (like other
border assets, e.g. ui/resources/default_100_percent/common/window_*), or they
should be drawn with skia once and cached to bitmap(s) for repeated bit blitting
(I hope Chrome will start doing that more often instead of shipping image
assets; for custom color support, binary sizes, etc.).

+  std::vector<gfx::ShadowValue> shadows;
+  shadows.push_back(gfx::ShadowValue(gfx::Point(), blur_, color_));
+  skia::RefPtr<SkDrawLooper> looper = gfx::CreateShadowDrawLooper(shadows);
+  paint.setLooper(looper.get());
+  paint.setColor(SK_ColorTRANSPARENT);
+  paint.setStrokeJoin(SkPaint::kRound_Join);
+  gfx::Rect bounds(view.size());
+  bounds.Inset(gfx::Insets(blur_ / 2, blur_ / 2, blur_ / 2, blur_ / 2));
+  canvas->DrawRect(bounds, paint);
+}
+
+gfx::Insets ShadowBorder::GetInsets() const {
+  return gfx::Insets(blur_ / 2 - vertical_offset_,
+                     blur_ / 2 - horizontal_offset_,
+                     blur_ / 2 + vertical_offset_,
+                     blur_ / 2 + horizontal_offset_);
+}
+
+}  // namespace views