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Side by Side Diff: trunk/src/chromeos/display/output_util.cc

Issue 24365012: Revert 225054 "linux_aura: Implement most of DesktopScreenX11." (Closed) Base URL: svn://svn.chromium.org/chrome/
Patch Set: Created 7 years, 2 months ago
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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "chromeos/display/output_util.h" 5 #include "chromeos/display/output_util.h"
6 6
7 #include <X11/Xlib.h>
7 #include <X11/extensions/Xrandr.h> 8 #include <X11/extensions/Xrandr.h>
8 #include <X11/Xatom.h> 9 #include <X11/Xatom.h>
9 #include <X11/Xlib.h>
10 10
11 #include "base/hash.h"
12 #include "base/message_loop/message_loop.h"
11 #include "base/strings/string_util.h" 13 #include "base/strings/string_util.h"
12 #include "base/x11/edid_parser_x11.h" 14 #include "base/sys_byteorder.h"
13 15
14 namespace chromeos { 16 namespace chromeos {
15 namespace { 17 namespace {
16 18
17 // Prefixes for the built-in displays. 19 // Prefixes for the built-in displays.
18 const char kInternal_LVDS[] = "LVDS"; 20 const char kInternal_LVDS[] = "LVDS";
19 const char kInternal_eDP[] = "eDP"; 21 const char kInternal_eDP[] = "eDP";
20 const char kInternal_DSI[] = "DSI"; 22 const char kInternal_DSI[] = "DSI";
21 23
24 // Returns 64-bit persistent ID for the specified manufacturer's ID and
25 // product_code_hash, and the index of the output it is connected to.
26 // |output_index| is used to distinguish the displays of the same type. For
27 // example, swapping two identical display between two outputs will not be
28 // treated as swap. The 'serial number' field in EDID isn't used here because
29 // it is not guaranteed to have unique number and it may have the same fixed
30 // value (like 0).
31 int64 GetID(uint16 manufacturer_id,
32 uint32 product_code_hash,
33 uint8 output_index) {
34 return ((static_cast<int64>(manufacturer_id) << 40) |
35 (static_cast<int64>(product_code_hash) << 8) | output_index);
36 }
37
38 bool IsRandRAvailable() {
39 int randr_version_major = 0;
40 int randr_version_minor = 0;
41 static bool is_randr_available = XRRQueryVersion(
42 base::MessagePumpX11::GetDefaultXDisplay(),
43 &randr_version_major, &randr_version_minor);
44 return is_randr_available;
45 }
46
47 // Get the EDID data from the |output| and stores to |prop|. |nitem| will store
48 // the number of characters |prop| will have. It doesn't take the ownership of
49 // |prop|, so caller must release it by XFree().
50 // Returns true if EDID property is successfully obtained. Otherwise returns
51 // false and does not touch |prop| and |nitems|.
52 bool GetEDIDProperty(XID output, unsigned long* nitems, unsigned char** prop) {
53 if (!IsRandRAvailable())
54 return false;
55
56 Display* display = base::MessagePumpX11::GetDefaultXDisplay();
57
58 static Atom edid_property = XInternAtom(
59 base::MessagePumpX11::GetDefaultXDisplay(),
60 RR_PROPERTY_RANDR_EDID, false);
61
62 bool has_edid_property = false;
63 int num_properties = 0;
64 Atom* properties = XRRListOutputProperties(display, output, &num_properties);
65 for (int i = 0; i < num_properties; ++i) {
66 if (properties[i] == edid_property) {
67 has_edid_property = true;
68 break;
69 }
70 }
71 XFree(properties);
72 if (!has_edid_property)
73 return false;
74
75 Atom actual_type;
76 int actual_format;
77 unsigned long bytes_after;
78 XRRGetOutputProperty(display,
79 output,
80 edid_property,
81 0, // offset
82 128, // length
83 false, // _delete
84 false, // pending
85 AnyPropertyType, // req_type
86 &actual_type,
87 &actual_format,
88 nitems,
89 &bytes_after,
90 prop);
91 DCHECK_EQ(XA_INTEGER, actual_type);
92 DCHECK_EQ(8, actual_format);
93 return true;
94 }
95
22 // Gets some useful data from the specified output device, such like 96 // Gets some useful data from the specified output device, such like
23 // manufacturer's ID, product code, and human readable name. Returns false if it 97 // manufacturer's ID, product code, and human readable name. Returns false if it
24 // fails to get those data and doesn't touch manufacturer ID/product code/name. 98 // fails to get those data and doesn't touch manufacturer ID/product code/name.
25 // NULL can be passed for unwanted output parameters. 99 // NULL can be passed for unwanted output parameters.
26 bool GetOutputDeviceData(XID output, 100 bool GetOutputDeviceData(XID output,
27 uint16* manufacturer_id, 101 uint16* manufacturer_id,
28 std::string* human_readable_name) { 102 std::string* human_readable_name) {
29 unsigned long nitems = 0; 103 unsigned long nitems = 0;
30 unsigned char *prop = NULL; 104 unsigned char *prop = NULL;
31 if (!base::GetEDIDProperty(output, &nitems, &prop)) 105 if (!GetEDIDProperty(output, &nitems, &prop))
32 return false; 106 return false;
33 107
34 bool result = base::ParseOutputDeviceData( 108 bool result = ParseOutputDeviceData(
35 prop, nitems, manufacturer_id, human_readable_name); 109 prop, nitems, manufacturer_id, human_readable_name);
36 XFree(prop); 110 XFree(prop);
37 return result; 111 return result;
38 } 112 }
39 113
40 } // namespace 114 } // namespace
41 115
42 std::string GetDisplayName(XID output_id) { 116 std::string GetDisplayName(XID output_id) {
43 std::string display_name; 117 std::string display_name;
44 GetOutputDeviceData(output_id, NULL, &display_name); 118 GetOutputDeviceData(output_id, NULL, &display_name);
45 return display_name; 119 return display_name;
46 } 120 }
47 121
122 bool GetDisplayId(XID output_id, size_t output_index, int64* display_id_out) {
123 unsigned long nitems = 0;
124 unsigned char* prop = NULL;
125 if (!GetEDIDProperty(output_id, &nitems, &prop))
126 return false;
127
128 bool result =
129 GetDisplayIdFromEDID(prop, nitems, output_index, display_id_out);
130 XFree(prop);
131 return result;
132 }
133
134 bool GetDisplayIdFromEDID(const unsigned char* prop,
135 unsigned long nitems,
136 size_t output_index,
137 int64* display_id_out) {
138 uint16 manufacturer_id = 0;
139 std::string product_name;
140
141 // ParseOutputDeviceData fails if it doesn't have product_name.
142 ParseOutputDeviceData(prop, nitems, &manufacturer_id, &product_name);
143
144 // Generates product specific value from product_name instead of product code.
145 // See crbug.com/240341
146 uint32 product_code_hash = product_name.empty() ?
147 0 : base::Hash(product_name);
148 if (manufacturer_id != 0) {
149 // An ID based on display's index will be assigned later if this call
150 // fails.
151 *display_id_out = GetID(
152 manufacturer_id, product_code_hash, output_index);
153 return true;
154 }
155 return false;
156 }
157
158 bool ParseOutputDeviceData(const unsigned char* prop,
159 unsigned long nitems,
160 uint16* manufacturer_id,
161 std::string* human_readable_name) {
162 // See http://en.wikipedia.org/wiki/Extended_display_identification_data
163 // for the details of EDID data format. We use the following data:
164 // bytes 8-9: manufacturer EISA ID, in big-endian
165 // bytes 54-125: four descriptors (18-bytes each) which may contain
166 // the display name.
167 const unsigned int kManufacturerOffset = 8;
168 const unsigned int kManufacturerLength = 2;
169 const unsigned int kDescriptorOffset = 54;
170 const unsigned int kNumDescriptors = 4;
171 const unsigned int kDescriptorLength = 18;
172 // The specifier types.
173 const unsigned char kMonitorNameDescriptor = 0xfc;
174
175 if (manufacturer_id) {
176 if (nitems < kManufacturerOffset + kManufacturerLength) {
177 LOG(ERROR) << "too short EDID data: manifacturer id";
178 return false;
179 }
180
181 *manufacturer_id =
182 *reinterpret_cast<const uint16*>(prop + kManufacturerOffset);
183 #if defined(ARCH_CPU_LITTLE_ENDIAN)
184 *manufacturer_id = base::ByteSwap(*manufacturer_id);
185 #endif
186 }
187
188 if (!human_readable_name)
189 return true;
190
191 human_readable_name->clear();
192 for (unsigned int i = 0; i < kNumDescriptors; ++i) {
193 if (nitems < kDescriptorOffset + (i + 1) * kDescriptorLength)
194 break;
195
196 const unsigned char* desc_buf =
197 prop + kDescriptorOffset + i * kDescriptorLength;
198 // If the descriptor contains the display name, it has the following
199 // structure:
200 // bytes 0-2, 4: \0
201 // byte 3: descriptor type, defined above.
202 // bytes 5-17: text data, ending with \r, padding with spaces
203 // we should check bytes 0-2 and 4, since it may have other values in
204 // case that the descriptor contains other type of data.
205 if (desc_buf[0] == 0 && desc_buf[1] == 0 && desc_buf[2] == 0 &&
206 desc_buf[4] == 0) {
207 if (desc_buf[3] == kMonitorNameDescriptor) {
208 std::string found_name(
209 reinterpret_cast<const char*>(desc_buf + 5), kDescriptorLength - 5);
210 TrimWhitespaceASCII(found_name, TRIM_TRAILING, human_readable_name);
211 break;
212 }
213 }
214 }
215
216 // Verify if the |human_readable_name| consists of printable characters only.
217 for (size_t i = 0; i < human_readable_name->size(); ++i) {
218 char c = (*human_readable_name)[i];
219 if (!isascii(c) || !isprint(c)) {
220 human_readable_name->clear();
221 LOG(ERROR) << "invalid EDID: human unreadable char in name";
222 return false;
223 }
224 }
225
226 return true;
227 }
228
48 bool GetOutputOverscanFlag(XID output, bool* flag) { 229 bool GetOutputOverscanFlag(XID output, bool* flag) {
49 unsigned long nitems = 0; 230 unsigned long nitems = 0;
50 unsigned char *prop = NULL; 231 unsigned char *prop = NULL;
51 if (!base::GetEDIDProperty(output, &nitems, &prop)) 232 if (!GetEDIDProperty(output, &nitems, &prop))
52 return false; 233 return false;
53 234
54 bool found = ParseOutputOverscanFlag(prop, nitems, flag); 235 bool found = ParseOutputOverscanFlag(prop, nitems, flag);
55 XFree(prop); 236 XFree(prop);
56 return found; 237 return found;
57 } 238 }
58 239
59 bool ParseOutputOverscanFlag(const unsigned char* prop, 240 bool ParseOutputOverscanFlag(const unsigned char* prop,
60 unsigned long nitems, 241 unsigned long nitems,
61 bool *flag) { 242 bool *flag) {
(...skipping 105 matching lines...) Expand 10 before | Expand all | Expand 10 after
167 mode_info.hTotal = 1; 348 mode_info.hTotal = 1;
168 mode_info.vTotal = 1; 349 mode_info.vTotal = 1;
169 mode_info.dotClock = refresh_rate; 350 mode_info.dotClock = refresh_rate;
170 } 351 }
171 return mode_info; 352 return mode_info;
172 } 353 }
173 354
174 } // namespace test 355 } // namespace test
175 356
176 } // namespace chromeos 357 } // namespace chromeos
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