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1 // Copyright 2014 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/corewm/cursor_height_provider_win.h" | |
6 | |
7 #include <windows.h> | |
8 #include <map> | |
9 | |
10 #include "base/basictypes.h" | |
11 #include "base/memory/scoped_ptr.h" | |
12 #include "base/win/scoped_hdc.h" | |
13 | |
14 namespace { | |
15 typedef scoped_ptr<uint32> PixelData; | |
sky
2014/05/16 17:13:22
uint32 is deprecated. Use uint32_t (same comment a
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16 typedef std::map<HCURSOR, int> HeightStorage; | |
17 | |
18 const uint32 bits_per_uint32 = 32; | |
sky
2014/05/16 17:13:22
Why not use sizeof(uint32_t) * 8 when you need thi
Mateusz Szymański
2014/05/19 07:43:13
Because uint32 is obviously 32 bits long and if th
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19 // All bits are 1 for transparent portion of monochromatic mask. | |
20 const uint32 transparent_mask = 0xffffffff; | |
sky
2014/05/16 17:13:22
Use k for constants, eg kTransparentMask.
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21 // This is height of default pointer arrow in Windows 7. | |
22 const int default_height = 20; | |
23 | |
24 static HeightStorage* cached_heights = nullptr; | |
sky
2014/05/16 17:13:22
We're not using c++ 11 yet.
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25 | |
26 // Extracts the pixel data of provided bitmap | |
27 PixelData GetBitmapData(HBITMAP handle, const BITMAPINFO& info, HDC hdc) { | |
28 PixelData data(nullptr); | |
29 // Masks are monochromatic. | |
30 DCHECK_EQ(info.bmiHeader.biBitCount, 1); | |
31 if (info.bmiHeader.biBitCount != 1) | |
32 return data.Pass(); | |
33 | |
34 const size_t number_of_colors = 2; | |
35 | |
36 const size_t header_and_palette = | |
37 sizeof(info.bmiHeader) + number_of_colors * sizeof(RGBQUAD); | |
38 // When getting pixel data palette is appended to memory pointed by | |
39 // BITMAPINFO passed so allocate additional memory to store additional data. | |
40 scoped_ptr<BITMAPINFO> header( | |
41 reinterpret_cast<BITMAPINFO*>(new char[header_and_palette])); | |
42 if (header == nullptr) | |
sky
2014/05/16 17:13:22
Don't null check news. If new fails we'll crash.
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43 return data.Pass(); | |
44 memcpy(header.get(), &(info.bmiHeader), sizeof(info.bmiHeader)); | |
45 | |
46 data.reset(new uint32[info.bmiHeader.biSizeImage / sizeof(uint32)]); | |
47 if (data == nullptr) | |
sky
2014/05/16 17:13:22
Same comment here about checking for null.
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48 return data.Pass(); | |
49 | |
50 int result = GetDIBits(hdc, | |
sky
2014/05/16 17:13:22
Shouldn't you check the return value? Perhaps rese
Mateusz Szymański
2014/05/19 07:43:13
Nicely spotted, I was sure I did.
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51 handle, | |
52 0, | |
53 info.bmiHeader.biHeight, | |
54 data.get(), | |
55 header.get(), | |
56 DIB_RGB_COLORS); | |
57 | |
58 return data.Pass(); | |
59 } | |
60 | |
61 // Checks if the specifed row is transparent in provided bitmap. | |
62 bool IsRowTransparent(const PixelData& data, const uint32 row_size, | |
sky
2014/05/16 17:13:22
nit: when you wrap, one param per line.
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63 const uint32 last_byte_mask, const uint32 y) { | |
64 // Set the padding bits to 1 to make mask matching easier. | |
65 *(data.get() + (y + 1)* row_size - 1) |= last_byte_mask; | |
66 for (uint32 i = y * row_size; i < (y + 1) * row_size; ++i) { | |
67 if (*(data.get() + i) != transparent_mask) | |
68 return false; | |
69 } | |
70 return true; | |
71 } | |
72 | |
73 // Gets the vertical offset between specified cursor's hotpoint and it's bottom. | |
74 // | |
75 // Gets the cursor image data and extract cursor's visible height. | |
76 // Based on that get's what should be the vertical offset between cursor's | |
77 // hot point and the tooltip. | |
78 int CalculateCursorHeight(HCURSOR cursor_handle) { | |
79 base::win::ScopedGetDC hdc(NULL); | |
80 | |
81 ICONINFO icon = {0}; | |
82 GetIconInfo(cursor_handle, &icon); | |
83 | |
84 BITMAPINFO bitmap_info = {0}; | |
85 bitmap_info.bmiHeader.biSize = sizeof(bitmap_info.bmiHeader); | |
86 if (GetDIBits(hdc, icon.hbmMask, 0, 0, NULL, &bitmap_info, DIB_RGB_COLORS) == | |
87 0) | |
88 return default_height; | |
89 | |
90 // Rows are padded to full DWORDs. OR with this mask will set them to 1 | |
91 // to simplify matching with |transparent_mask|. | |
92 uint32 last_byte_mask = ~0; | |
93 const unsigned char bits_to_shift = sizeof(last_byte_mask) * 8 - | |
94 (bitmap_info.bmiHeader.biWidth % bits_per_uint32); | |
95 if (bits_to_shift != bits_per_uint32) { | |
96 last_byte_mask = (last_byte_mask << bits_to_shift); | |
97 } else { | |
98 last_byte_mask = 0; | |
99 } | |
100 | |
101 const uint32 row_size = | |
102 (bitmap_info.bmiHeader.biWidth + bits_per_uint32 - 1) / bits_per_uint32; | |
103 PixelData data(GetBitmapData(icon.hbmMask, bitmap_info, hdc)); | |
104 if (data == nullptr) | |
sky
2014/05/16 17:13:22
no null check
Mateusz Szymański
2014/05/19 10:38:30
NULL here is return value indicating internal erro
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105 return default_height; | |
106 | |
107 const int cursor_height = GetSystemMetrics(SM_CYCURSOR); | |
108 int i = bitmap_info.bmiHeader.biHeight - cursor_height; | |
109 for (; i < bitmap_info.bmiHeader.biHeight; ++i) { | |
110 if (!IsRowTransparent(data, row_size, last_byte_mask, i)) { | |
111 i--; | |
112 break; | |
113 } | |
114 } | |
115 return bitmap_info.bmiHeader.biHeight - i - icon.yHotspot; | |
116 } | |
117 | |
118 } // namespace | |
119 | |
120 namespace views { | |
121 namespace corewm { | |
122 | |
123 int GetCursorHeight() { | |
124 CURSORINFO cursor = {0}; | |
125 cursor.cbSize = sizeof(cursor); | |
126 GetCursorInfo(&cursor); | |
127 | |
128 if (cached_heights == nullptr) { | |
sky
2014/05/16 17:13:22
nit: no {}
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129 cached_heights = new HeightStorage; | |
130 } | |
131 | |
132 HeightStorage::const_iterator cached_height = | |
133 cached_heights->find(cursor.hCursor); | |
134 if (cached_height != cached_heights->end()) | |
135 return cached_height->second; | |
136 | |
137 const int height = CalculateCursorHeight(cursor.hCursor); | |
138 (*cached_heights)[cursor.hCursor] = height; | |
139 | |
140 return height; | |
141 } | |
142 | |
143 } // namespace corewm | |
144 } // namespace views | |
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