1 // Copyright (c) 2012 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 "chrome/browser/ui/tabs/tab_resources.h"
6
7 #include "base/logging.h"
8 #include "ui/gfx/path.h"
9
10 namespace {
11
12 // Hit mask constants.
13 const SkScalar kTabCapWidth = 15;
14 const SkScalar kTabTopCurveWidth = 4;
15 const SkScalar kTabBottomCurveWidth = 3;
16 #if defined(TOOLKIT_VIEWS)
17 // Windows and Ash have shadows in the left, right and top parts of the tab.
18 const SkScalar kTabInset = 6;
19 const SkScalar kTabTop = 2;
20 #else
21 // Linux GTK and Mac don't have the shadows.
22 const SkScalar kTabInset = 0;
23 const SkScalar kTabTop = 0;
24 #endif
25
26 } // namespace
27
28 // static
GetHitTestMask(int width,int height,bool include_top_shadow,gfx::Path * path)29 void TabResources::GetHitTestMask(int width,
30 int height,
31 bool include_top_shadow,
32 gfx::Path* path) {
33 DCHECK(path);
34
35 SkScalar left = kTabInset;
36 SkScalar top = kTabTop;
37 SkScalar right = SkIntToScalar(width) - kTabInset;
38 SkScalar bottom = SkIntToScalar(height);
39
40 // Start in the lower-left corner.
41 path->moveTo(left, bottom);
42
43 // Left end cap.
44 path->lineTo(left + kTabBottomCurveWidth, bottom - kTabBottomCurveWidth);
45 path->lineTo(left + kTabCapWidth - kTabTopCurveWidth,
46 top + kTabTopCurveWidth);
47 path->lineTo(left + kTabCapWidth, top);
48
49 // Extend over the top shadow area if we have one and the caller wants it.
50 if (kTabTop > 0 && include_top_shadow) {
51 path->lineTo(left + kTabCapWidth, 0);
52 path->lineTo(right - kTabCapWidth, 0);
53 }
54
55 // Connect to the right cap.
56 path->lineTo(right - kTabCapWidth, top);
57
58 // Right end cap.
59 path->lineTo(right - kTabCapWidth + kTabTopCurveWidth,
60 top + kTabTopCurveWidth);
61 path->lineTo(right - kTabBottomCurveWidth, bottom - kTabBottomCurveWidth);
62 path->lineTo(right, bottom);
63
64 // Close out the path.
65 path->lineTo(left, bottom);
66 path->close();
67 }
68