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1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "ui/views/shadow_border.h"
6 
7 #include "ui/gfx/canvas.h"
8 #include "ui/gfx/insets.h"
9 #include "ui/gfx/rect.h"
10 #include "ui/gfx/shadow_value.h"
11 #include "ui/gfx/skia_util.h"
12 #include "ui/views/view.h"
13 
14 namespace views {
15 
ShadowBorder(int blur,SkColor color,int vertical_offset,int horizontal_offset)16 ShadowBorder::ShadowBorder(int blur,
17                            SkColor color,
18                            int vertical_offset,
19                            int horizontal_offset)
20     : views::Border(),
21       blur_(blur),
22       color_(color),
23       vertical_offset_(vertical_offset),
24       horizontal_offset_(horizontal_offset) {}
25 
~ShadowBorder()26 ShadowBorder::~ShadowBorder() {}
27 
28 // TODO(sidharthms): Re-painting a shadow looper on every paint call may yield
29 // poor performance. Ideally we should be caching the border to bitmaps.
Paint(const views::View & view,gfx::Canvas * canvas)30 void ShadowBorder::Paint(const views::View& view, gfx::Canvas* canvas) {
31   SkPaint paint;
32   std::vector<gfx::ShadowValue> shadows;
33   shadows.push_back(gfx::ShadowValue(gfx::Point(), blur_, color_));
34   skia::RefPtr<SkDrawLooper> looper = gfx::CreateShadowDrawLooper(shadows);
35   paint.setLooper(looper.get());
36   paint.setColor(SK_ColorTRANSPARENT);
37   paint.setStrokeJoin(SkPaint::kRound_Join);
38   gfx::Rect bounds(view.size());
39   // TODO(pkasting): This isn't right if one of the offsets is larger than
40   // (blur_ / 2).
41   bounds.Inset(gfx::Insets(blur_ / 2, blur_ / 2, blur_ / 2, blur_ / 2));
42   canvas->DrawRect(bounds, paint);
43 }
44 
GetInsets() const45 gfx::Insets ShadowBorder::GetInsets() const {
46   return gfx::Insets(blur_ / 2 - vertical_offset_,
47                      blur_ / 2 - horizontal_offset_,
48                      blur_ / 2 + vertical_offset_,
49                      blur_ / 2 + horizontal_offset_);
50 }
51 
GetMinimumSize() const52 gfx::Size ShadowBorder::GetMinimumSize() const {
53   return gfx::Size(blur_, blur_);
54 }
55 
56 }  // namespace views
57