| OLD | NEW |
|---|
| (Empty) |
| 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/gfx/win/direct_write.h" | |
| 6 | |
| 7 #include "base/basictypes.h" | |
| 8 #include "base/command_line.h" | |
| 9 #include "base/metrics/field_trial.h" | |
| 10 #include "base/win/registry.h" | |
| 11 #include "base/win/windows_version.h" | |
| 12 #include "ui/gfx/switches.h" | |
| 13 #include "ui/gfx/win/dpi.h" | |
| 14 | |
| 15 namespace gfx { | |
| 16 namespace win { | |
| 17 | |
| 18 bool ShouldUseDirectWrite() { | |
| 19 // If the flag is currently on, and we're on Win7 or above, we enable | |
| 20 // DirectWrite. Skia does not require the additions to DirectWrite in QFE | |
| 21 // 2670838, but a simple 'better than XP' check is not enough. | |
| 22 if (base::win::GetVersion() < base::win::VERSION_WIN7) | |
| 23 return false; | |
| 24 | |
| 25 base::win::OSInfo::VersionNumber os_version = | |
| 26 base::win::OSInfo::GetInstance()->version_number(); | |
| 27 if ((os_version.major == 6) && (os_version.minor == 1)) { | |
| 28 // We can't use DirectWrite for pre-release versions of Windows 7. | |
| 29 if (os_version.build < 7600) | |
| 30 return false; | |
| 31 } | |
| 32 // If forced off, don't use it. | |
| 33 const base::CommandLine& command_line = | |
| 34 *base::CommandLine::ForCurrentProcess(); | |
| 35 if (command_line.HasSwitch(switches::kDisableDirectWrite)) | |
| 36 return false; | |
| 37 | |
| 38 // Can't use GDI on HiDPI. | |
| 39 if (gfx::GetDPIScale() > 1.0f) | |
| 40 return true; | |
| 41 | |
| 42 // We have logic in renderer_font_platform_win.cc for falling back to safe | |
| 43 // font list if machine has more than 1750 fonts installed. Users have | |
| 44 // complained about this as safe font list is usually not sufficient. | |
| 45 // We now disable direct write (gdi) if we encounter more number | |
| 46 // of fonts than a threshold (currently 1750). | |
| 47 // Refer: crbug.com/421305 | |
| 48 const wchar_t kWindowsFontsRegistryKey[] = | |
| 49 L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts"; | |
| 50 base::win::RegistryValueIterator reg_iterator(HKEY_LOCAL_MACHINE, | |
| 51 kWindowsFontsRegistryKey); | |
| 52 const DWORD kMaxAllowedFontsBeforeFallbackToGDI = 1750; | |
| 53 if (reg_iterator.ValueCount() >= kMaxAllowedFontsBeforeFallbackToGDI) | |
| 54 return false; | |
| 55 | |
| 56 // Otherwise, check the field trial. | |
| 57 const std::string group_name = | |
| 58 base::FieldTrialList::FindFullName("DirectWrite"); | |
| 59 return group_name != "Disabled"; | |
| 60 } | |
| 61 | |
| 62 } // namespace win | |
| 63 } // namespace gfx | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 978673002:
Remove some unused ui/gfx code. (Closed)
Base URL: https://github.com/domokit/mojo.git@master