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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 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 "ui/display/edid_parser.h" | 5 #include "ui/display/edid_parser.h" |
| 6 | 6 |
| 7 #include <algorithm> | 7 #include <algorithm> |
| 8 | 8 |
| 9 #include "base/hash.h" | 9 #include "base/hash.h" |
| 10 #include "base/strings/string_util.h" | 10 #include "base/strings/string_util.h" |
| 11 #include "base/sys_byteorder.h" | 11 #include "base/sys_byteorder.h" |
| 12 | 12 |
| 13 namespace ui { | 13 namespace ui { |
| 14 | 14 |
| 15 namespace { | 15 namespace { |
| 16 | 16 |
| 17 // Returns 64-bit persistent ID for the specified manufacturer's ID and | 17 // Returns 64-bit persistent ID for the specified manufacturer's ID and |
| 18 // product_code_hash, and the index of the output it is connected to. | 18 // product_code_hash, and the index of the output it is connected to. |
| 19 // |output_index| is used to distinguish the displays of the same type. For | 19 // |output_index| is used to distinguish the displays of the same type. For |
| 20 // example, swapping two identical display between two outputs will not be | 20 // example, swapping two identical display between two outputs will not be |
| 21 // treated as swap. The 'serial number' field in EDID isn't used here because | 21 // treated as swap. The 'serial number' field in EDID isn't used here because |
| 22 // it is not guaranteed to have unique number and it may have the same fixed | 22 // it is not guaranteed to have unique number and it may have the same fixed |
| 23 // value (like 0). | 23 // value (like 0). |
| 24 int64 GetID(uint16 manufacturer_id, | 24 int64_t GetID(uint16_t manufacturer_id, |
| 25 uint32 product_code_hash, | 25 uint32_t product_code_hash, |
| 26 uint8 output_index) { | 26 uint8_t output_index) { |
| 27 return ((static_cast<int64>(manufacturer_id) << 40) | | 27 return ((static_cast<int64_t>(manufacturer_id) << 40) | |
| 28 (static_cast<int64>(product_code_hash) << 8) | output_index); | 28 (static_cast<int64_t>(product_code_hash) << 8) | output_index); |
| 29 } | 29 } |
| 30 | 30 |
| 31 } // namespace | 31 } // namespace |
| 32 | 32 |
| 33 bool GetDisplayIdFromEDID(const std::vector<uint8>& edid, | 33 bool GetDisplayIdFromEDID(const std::vector<uint8_t>& edid, |
| 34 uint8 output_index, | 34 uint8_t output_index, |
| 35 int64* display_id_out) { | 35 int64_t* display_id_out) { |
| 36 uint16 manufacturer_id = 0; | 36 uint16_t manufacturer_id = 0; |
| 37 std::string product_name; | 37 std::string product_name; |
| 38 | 38 |
| 39 // ParseOutputDeviceData fails if it doesn't have product_name. | 39 // ParseOutputDeviceData fails if it doesn't have product_name. |
| 40 ParseOutputDeviceData(edid, &manufacturer_id, &product_name); | 40 ParseOutputDeviceData(edid, &manufacturer_id, &product_name); |
| 41 | 41 |
| 42 // Generates product specific value from product_name instead of product code. | 42 // Generates product specific value from product_name instead of product code. |
| 43 // See crbug.com/240341 | 43 // See crbug.com/240341 |
| 44 uint32 product_code_hash = product_name.empty() ? | 44 uint32_t product_code_hash = product_name.empty() ? |
| 45 0 : base::Hash(product_name); | 45 0 : base::Hash(product_name); |
| 46 if (manufacturer_id != 0) { | 46 if (manufacturer_id != 0) { |
| 47 // An ID based on display's index will be assigned later if this call | 47 // An ID based on display's index will be assigned later if this call |
| 48 // fails. | 48 // fails. |
| 49 *display_id_out = GetID( | 49 *display_id_out = GetID( |
| 50 manufacturer_id, product_code_hash, output_index); | 50 manufacturer_id, product_code_hash, output_index); |
| 51 return true; | 51 return true; |
| 52 } | 52 } |
| 53 return false; | 53 return false; |
| 54 } | 54 } |
| 55 | 55 |
| 56 bool ParseOutputDeviceData(const std::vector<uint8>& edid, | 56 bool ParseOutputDeviceData(const std::vector<uint8_t>& edid, |
| 57 uint16* manufacturer_id, | 57 uint16_t* manufacturer_id, |
| 58 std::string* human_readable_name) { | 58 std::string* human_readable_name) { |
| 59 // See http://en.wikipedia.org/wiki/Extended_display_identification_data | 59 // See http://en.wikipedia.org/wiki/Extended_display_identification_data |
| 60 // for the details of EDID data format. We use the following data: | 60 // for the details of EDID data format. We use the following data: |
| 61 // bytes 8-9: manufacturer EISA ID, in big-endian | 61 // bytes 8-9: manufacturer EISA ID, in big-endian |
| 62 // bytes 54-125: four descriptors (18-bytes each) which may contain | 62 // bytes 54-125: four descriptors (18-bytes each) which may contain |
| 63 // the display name. | 63 // the display name. |
| 64 const unsigned int kManufacturerOffset = 8; | 64 const unsigned int kManufacturerOffset = 8; |
| 65 const unsigned int kManufacturerLength = 2; | 65 const unsigned int kManufacturerLength = 2; |
| 66 const unsigned int kDescriptorOffset = 54; | 66 const unsigned int kDescriptorOffset = 54; |
| 67 const unsigned int kNumDescriptors = 4; | 67 const unsigned int kNumDescriptors = 4; |
| 68 const unsigned int kDescriptorLength = 18; | 68 const unsigned int kDescriptorLength = 18; |
| 69 // The specifier types. | 69 // The specifier types. |
| 70 const unsigned char kMonitorNameDescriptor = 0xfc; | 70 const unsigned char kMonitorNameDescriptor = 0xfc; |
| 71 | 71 |
| 72 if (manufacturer_id) { | 72 if (manufacturer_id) { |
| 73 if (edid.size() < kManufacturerOffset + kManufacturerLength) { | 73 if (edid.size() < kManufacturerOffset + kManufacturerLength) { |
| 74 LOG(ERROR) << "too short EDID data: manifacturer id"; | 74 LOG(ERROR) << "too short EDID data: manifacturer id"; |
| 75 return false; | 75 return false; |
| 76 } | 76 } |
| 77 | 77 |
| 78 *manufacturer_id = | 78 *manufacturer_id = |
| 79 *reinterpret_cast<const uint16*>(&edid[kManufacturerOffset]); | 79 *reinterpret_cast<const uint16_t*>(&edid[kManufacturerOffset]); |
| 80 #if defined(ARCH_CPU_LITTLE_ENDIAN) | 80 #if defined(ARCH_CPU_LITTLE_ENDIAN) |
| 81 *manufacturer_id = base::ByteSwap(*manufacturer_id); | 81 *manufacturer_id = base::ByteSwap(*manufacturer_id); |
| 82 #endif | 82 #endif |
| 83 } | 83 } |
| 84 | 84 |
| 85 if (!human_readable_name) | 85 if (!human_readable_name) |
| 86 return true; | 86 return true; |
| 87 | 87 |
| 88 human_readable_name->clear(); | 88 human_readable_name->clear(); |
| 89 for (unsigned int i = 0; i < kNumDescriptors; ++i) { | 89 for (unsigned int i = 0; i < kNumDescriptors; ++i) { |
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| 114 if (!isascii(c) || !isprint(c)) { | 114 if (!isascii(c) || !isprint(c)) { |
| 115 human_readable_name->clear(); | 115 human_readable_name->clear(); |
| 116 LOG(ERROR) << "invalid EDID: human unreadable char in name"; | 116 LOG(ERROR) << "invalid EDID: human unreadable char in name"; |
| 117 return false; | 117 return false; |
| 118 } | 118 } |
| 119 } | 119 } |
| 120 | 120 |
| 121 return true; | 121 return true; |
| 122 } | 122 } |
| 123 | 123 |
| 124 bool ParseOutputOverscanFlag(const std::vector<uint8>& edid, | 124 bool ParseOutputOverscanFlag(const std::vector<uint8_t>& edid, |
| 125 bool* flag) { | 125 bool* flag) { |
| 126 // See http://en.wikipedia.org/wiki/Extended_display_identification_data | 126 // See http://en.wikipedia.org/wiki/Extended_display_identification_data |
| 127 // for the extension format of EDID. Also see EIA/CEA-861 spec for | 127 // for the extension format of EDID. Also see EIA/CEA-861 spec for |
| 128 // the format of the extensions and how video capability is encoded. | 128 // the format of the extensions and how video capability is encoded. |
| 129 // - byte 0: tag. should be 02h. | 129 // - byte 0: tag. should be 02h. |
| 130 // - byte 1: revision. only cares revision 3 (03h). | 130 // - byte 1: revision. only cares revision 3 (03h). |
| 131 // - byte 4-: data block. | 131 // - byte 4-: data block. |
| 132 const unsigned int kExtensionBase = 128; | 132 const unsigned int kExtensionBase = 128; |
| 133 const unsigned int kExtensionSize = 128; | 133 const unsigned int kExtensionSize = 128; |
| 134 const unsigned int kNumExtensionsOffset = 126; | 134 const unsigned int kNumExtensionsOffset = 126; |
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| 188 *flag = false; | 188 *flag = false; |
| 189 } | 189 } |
| 190 return true; | 190 return true; |
| 191 } | 191 } |
| 192 } | 192 } |
| 193 | 193 |
| 194 return false; | 194 return false; |
| 195 } | 195 } |
| 196 | 196 |
| 197 } // namespace ui | 197 } // namespace ui |
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