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      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
      3 // found in the LICENSE file.
      4 
      5 #include <stdio.h>
      6 #include <string>
      7 #include <vector>
      8 
      9 #include "ash/display/display_info.h"
     10 #include "base/logging.h"
     11 #include "base/strings/string_number_conversions.h"
     12 #include "base/strings/string_util.h"
     13 #include "base/strings/stringprintf.h"
     14 #include "ui/gfx/display.h"
     15 #include "ui/gfx/size_conversions.h"
     16 #include "ui/gfx/size_f.h"
     17 
     18 #if defined(OS_WIN)
     19 #include "ui/aura/window_tree_host.h"
     20 #include "ui/gfx/win/dpi.h"
     21 #endif
     22 
     23 namespace ash {
     24 namespace {
     25 
     26 bool use_125_dsf_for_ui_scaling = false;
     27 
     28 // Check the content of |spec| and fill |bounds| and |device_scale_factor|.
     29 // Returns true when |bounds| is found.
     30 bool GetDisplayBounds(
     31     const std::string& spec, gfx::Rect* bounds, float* device_scale_factor) {
     32   int width = 0;
     33   int height = 0;
     34   int x = 0;
     35   int y = 0;
     36   if (sscanf(spec.c_str(), "%dx%d*%f",
     37              &width, &height, device_scale_factor) >= 2 ||
     38       sscanf(spec.c_str(), "%d+%d-%dx%d*%f", &x, &y, &width, &height,
     39              device_scale_factor) >= 4) {
     40     bounds->SetRect(x, y, width, height);
     41     return true;
     42   }
     43   return false;
     44 }
     45 
     46 }  // namespace
     47 
     48 DisplayMode::DisplayMode()
     49     : refresh_rate(0.0f),
     50       interlaced(false),
     51       native(false),
     52       ui_scale(1.0f),
     53       device_scale_factor(1.0f) {}
     54 
     55 DisplayMode::DisplayMode(const gfx::Size& size,
     56                          float refresh_rate,
     57                          bool interlaced,
     58                          bool native)
     59     : size(size),
     60       refresh_rate(refresh_rate),
     61       interlaced(interlaced),
     62       native(native),
     63       ui_scale(1.0f),
     64       device_scale_factor(1.0f) {}
     65 
     66 gfx::Size DisplayMode::GetSizeInDIP() const {
     67   gfx::SizeF size_dip(size);
     68   size_dip.Scale(ui_scale);
     69   // DSF=1.25 is special. The screen is drawn with DSF=1.25 in some mode but it
     70   // doesn't affect the screen size computation.
     71   if (!use_125_dsf_for_ui_scaling || device_scale_factor != 1.25f)
     72     size_dip.Scale(1.0f / device_scale_factor);
     73   return gfx::ToFlooredSize(size_dip);
     74 }
     75 
     76 bool DisplayMode::IsEquivalent(const DisplayMode& other) const {
     77   const float kEpsilon = 0.0001f;
     78   return size == other.size &&
     79       std::abs(ui_scale - other.ui_scale) < kEpsilon &&
     80       std::abs(device_scale_factor - other.device_scale_factor) < kEpsilon;
     81 }
     82 
     83 // satic
     84 DisplayInfo DisplayInfo::CreateFromSpec(const std::string& spec) {
     85   return CreateFromSpecWithID(spec, gfx::Display::kInvalidDisplayID);
     86 }
     87 
     88 // static
     89 void DisplayInfo::SetUse125DSFForUIScaling(bool enable) {
     90   use_125_dsf_for_ui_scaling = enable;
     91 }
     92 
     93 // static
     94 DisplayInfo DisplayInfo::CreateFromSpecWithID(const std::string& spec,
     95                                               int64 id) {
     96   // Default bounds for a display.
     97   const int kDefaultHostWindowX = 200;
     98   const int kDefaultHostWindowY = 200;
     99   const int kDefaultHostWindowWidth = 1366;
    100   const int kDefaultHostWindowHeight = 768;
    101 
    102   // Use larger than max int to catch overflow early.
    103   static int64 synthesized_display_id = 2200000000LL;
    104 
    105 #if defined(OS_WIN)
    106   gfx::Rect bounds_in_native(aura::WindowTreeHost::GetNativeScreenSize());
    107 #else
    108   gfx::Rect bounds_in_native(kDefaultHostWindowX, kDefaultHostWindowY,
    109                              kDefaultHostWindowWidth, kDefaultHostWindowHeight);
    110 #endif
    111   std::string main_spec = spec;
    112 
    113   float ui_scale = 1.0f;
    114   std::vector<std::string> parts;
    115   if (Tokenize(main_spec, "@", &parts) == 2) {
    116     double scale_in_double = 0;
    117     if (base::StringToDouble(parts[1], &scale_in_double))
    118       ui_scale = scale_in_double;
    119     main_spec = parts[0];
    120   }
    121 
    122   size_t count = Tokenize(main_spec, "/", &parts);
    123   gfx::Display::Rotation rotation(gfx::Display::ROTATE_0);
    124   bool has_overscan = false;
    125   if (count) {
    126     main_spec = parts[0];
    127     if (count >= 2) {
    128       std::string options = parts[1];
    129       for (size_t i = 0; i < options.size(); ++i) {
    130         char c = options[i];
    131         switch (c) {
    132           case 'o':
    133             has_overscan = true;
    134             break;
    135           case 'r':  // rotate 90 degrees to 'right'.
    136             rotation = gfx::Display::ROTATE_90;
    137             break;
    138           case 'u':  // 180 degrees, 'u'pside-down.
    139             rotation = gfx::Display::ROTATE_180;
    140             break;
    141           case 'l':  // rotate 90 degrees to 'left'.
    142             rotation = gfx::Display::ROTATE_270;
    143             break;
    144         }
    145       }
    146     }
    147   }
    148 
    149   float device_scale_factor = 1.0f;
    150   if (!GetDisplayBounds(main_spec, &bounds_in_native, &device_scale_factor)) {
    151 #if defined(OS_WIN)
    152     if (gfx::IsHighDPIEnabled()) {
    153       device_scale_factor = gfx::GetDPIScale();
    154     }
    155 #endif
    156   }
    157 
    158   std::vector<DisplayMode> display_modes;
    159   if (Tokenize(main_spec, "#", &parts) == 2) {
    160     size_t native_mode = 0;
    161     int largest_area = -1;
    162     float highest_refresh_rate = -1.0f;
    163     main_spec = parts[0];
    164     std::string resolution_list = parts[1];
    165     count = Tokenize(resolution_list, "|", &parts);
    166     for (size_t i = 0; i < count; ++i) {
    167       DisplayMode mode;
    168       gfx::Rect mode_bounds;
    169       std::vector<std::string> resolution;
    170       Tokenize(parts[i], "%", &resolution);
    171       if (GetDisplayBounds(
    172               resolution[0], &mode_bounds, &mode.device_scale_factor)) {
    173         mode.size = mode_bounds.size();
    174         if (resolution.size() > 1)
    175           sscanf(resolution[1].c_str(), "%f", &mode.refresh_rate);
    176         if (mode.size.GetArea() >= largest_area &&
    177             mode.refresh_rate > highest_refresh_rate) {
    178           // Use mode with largest area and highest refresh rate as native.
    179           largest_area = mode.size.GetArea();
    180           highest_refresh_rate = mode.refresh_rate;
    181           native_mode = i;
    182         }
    183         display_modes.push_back(mode);
    184       }
    185     }
    186     display_modes[native_mode].native = true;
    187   }
    188 
    189   if (id == gfx::Display::kInvalidDisplayID)
    190     id = synthesized_display_id++;
    191   DisplayInfo display_info(
    192       id, base::StringPrintf("Display-%d", static_cast<int>(id)), has_overscan);
    193   display_info.set_device_scale_factor(device_scale_factor);
    194   display_info.set_rotation(rotation);
    195   display_info.set_configured_ui_scale(ui_scale);
    196   display_info.SetBounds(bounds_in_native);
    197   display_info.set_display_modes(display_modes);
    198 
    199   // To test the overscan, it creates the default 5% overscan.
    200   if (has_overscan) {
    201     int width = bounds_in_native.width() / device_scale_factor / 40;
    202     int height = bounds_in_native.height() / device_scale_factor / 40;
    203     display_info.SetOverscanInsets(gfx::Insets(height, width, height, width));
    204     display_info.UpdateDisplaySize();
    205   }
    206 
    207   DVLOG(1) << "DisplayInfoFromSpec info=" << display_info.ToString()
    208            << ", spec=" << spec;
    209   return display_info;
    210 }
    211 
    212 DisplayInfo::DisplayInfo()
    213     : id_(gfx::Display::kInvalidDisplayID),
    214       has_overscan_(false),
    215       rotation_(gfx::Display::ROTATE_0),
    216       touch_support_(gfx::Display::TOUCH_SUPPORT_UNKNOWN),
    217       touch_device_id_(0),
    218       device_scale_factor_(1.0f),
    219       overscan_insets_in_dip_(0, 0, 0, 0),
    220       configured_ui_scale_(1.0f),
    221       native_(false),
    222       is_aspect_preserving_scaling_(false),
    223       color_profile_(ui::COLOR_PROFILE_STANDARD) {
    224 }
    225 
    226 DisplayInfo::DisplayInfo(int64 id,
    227                          const std::string& name,
    228                          bool has_overscan)
    229     : id_(id),
    230       name_(name),
    231       has_overscan_(has_overscan),
    232       rotation_(gfx::Display::ROTATE_0),
    233       touch_support_(gfx::Display::TOUCH_SUPPORT_UNKNOWN),
    234       touch_device_id_(0),
    235       device_scale_factor_(1.0f),
    236       overscan_insets_in_dip_(0, 0, 0, 0),
    237       configured_ui_scale_(1.0f),
    238       native_(false),
    239       color_profile_(ui::COLOR_PROFILE_STANDARD) {
    240 }
    241 
    242 DisplayInfo::~DisplayInfo() {
    243 }
    244 
    245 void DisplayInfo::Copy(const DisplayInfo& native_info) {
    246   DCHECK(id_ == native_info.id_);
    247   name_ = native_info.name_;
    248   has_overscan_ = native_info.has_overscan_;
    249 
    250   DCHECK(!native_info.bounds_in_native_.IsEmpty());
    251   bounds_in_native_ = native_info.bounds_in_native_;
    252   size_in_pixel_ = native_info.size_in_pixel_;
    253   device_scale_factor_ = native_info.device_scale_factor_;
    254   display_modes_ = native_info.display_modes_;
    255   touch_support_ = native_info.touch_support_;
    256   touch_device_id_ = native_info.touch_device_id_;
    257 
    258   // Copy overscan_insets_in_dip_ if it's not empty. This is for test
    259   // cases which use "/o" annotation which sets the overscan inset
    260   // to native, and that overscan has to be propagated. This does not
    261   // happen on the real environment.
    262   if (!native_info.overscan_insets_in_dip_.empty())
    263     overscan_insets_in_dip_ = native_info.overscan_insets_in_dip_;
    264 
    265   // Rotation_ and ui_scale_ color_profile_ are given by preference,
    266   // or unit tests. Don't copy if this native_info came from
    267   // DisplayChangeObserver.
    268   if (!native_info.native()) {
    269     rotation_ = native_info.rotation_;
    270     configured_ui_scale_ = native_info.configured_ui_scale_;
    271     color_profile_ = native_info.color_profile();
    272   }
    273 
    274   available_color_profiles_ = native_info.available_color_profiles();
    275 
    276   // Don't copy insets as it may be given by preference.  |rotation_|
    277   // is treated as a native so that it can be specified in
    278   // |CreateFromSpec|.
    279 }
    280 
    281 void DisplayInfo::SetBounds(const gfx::Rect& new_bounds_in_native) {
    282   bounds_in_native_ = new_bounds_in_native;
    283   size_in_pixel_ = new_bounds_in_native.size();
    284   UpdateDisplaySize();
    285 }
    286 
    287 float DisplayInfo::GetEffectiveDeviceScaleFactor() const {
    288   if (use_125_dsf_for_ui_scaling && device_scale_factor_ == 1.25f)
    289     return (configured_ui_scale_ == 0.8f) ? 1.25f : 1.0f;
    290   if (device_scale_factor_ == configured_ui_scale_)
    291     return 1.0f;
    292   return device_scale_factor_;
    293 }
    294 
    295 float DisplayInfo::GetEffectiveUIScale() const {
    296   if (use_125_dsf_for_ui_scaling && device_scale_factor_ == 1.25f)
    297     return (configured_ui_scale_ == 0.8f) ? 1.0f : configured_ui_scale_;
    298   if (device_scale_factor_ == configured_ui_scale_)
    299     return 1.0f;
    300   return configured_ui_scale_;
    301 }
    302 
    303 void DisplayInfo::UpdateDisplaySize() {
    304   size_in_pixel_ = bounds_in_native_.size();
    305   if (!overscan_insets_in_dip_.empty()) {
    306     gfx::Insets insets_in_pixel =
    307         overscan_insets_in_dip_.Scale(device_scale_factor_);
    308     size_in_pixel_.Enlarge(-insets_in_pixel.width(), -insets_in_pixel.height());
    309   } else {
    310     overscan_insets_in_dip_.Set(0, 0, 0, 0);
    311   }
    312 
    313   if (rotation_ == gfx::Display::ROTATE_90 ||
    314       rotation_ == gfx::Display::ROTATE_270)
    315     size_in_pixel_.SetSize(size_in_pixel_.height(), size_in_pixel_.width());
    316   gfx::SizeF size_f(size_in_pixel_);
    317   size_f.Scale(GetEffectiveUIScale());
    318   size_in_pixel_ = gfx::ToFlooredSize(size_f);
    319 }
    320 
    321 void DisplayInfo::SetOverscanInsets(const gfx::Insets& insets_in_dip) {
    322   overscan_insets_in_dip_ = insets_in_dip;
    323 }
    324 
    325 gfx::Insets DisplayInfo::GetOverscanInsetsInPixel() const {
    326   return overscan_insets_in_dip_.Scale(device_scale_factor_);
    327 }
    328 
    329 gfx::Size DisplayInfo::GetNativeModeSize() const {
    330   for (size_t i = 0; i < display_modes_.size(); ++i) {
    331     if (display_modes_[i].native)
    332       return display_modes_[i].size;
    333   }
    334 
    335   return gfx::Size();
    336 }
    337 
    338 std::string DisplayInfo::ToString() const {
    339   int rotation_degree = static_cast<int>(rotation_) * 90;
    340   return base::StringPrintf(
    341       "DisplayInfo[%lld] native bounds=%s, size=%s, scale=%f, "
    342       "overscan=%s, rotation=%d, ui-scale=%f, touchscreen=%s, "
    343       "touch-device-id=%d",
    344       static_cast<long long int>(id_),
    345       bounds_in_native_.ToString().c_str(),
    346       size_in_pixel_.ToString().c_str(),
    347       device_scale_factor_,
    348       overscan_insets_in_dip_.ToString().c_str(),
    349       rotation_degree,
    350       configured_ui_scale_,
    351       touch_support_ == gfx::Display::TOUCH_SUPPORT_AVAILABLE
    352           ? "yes"
    353           : touch_support_ == gfx::Display::TOUCH_SUPPORT_UNAVAILABLE
    354                 ? "no"
    355                 : "unknown",
    356       touch_device_id_);
    357 }
    358 
    359 std::string DisplayInfo::ToFullString() const {
    360   std::string display_modes_str;
    361   std::vector<DisplayMode>::const_iterator iter = display_modes_.begin();
    362   for (; iter != display_modes_.end(); ++iter) {
    363     if (!display_modes_str.empty())
    364       display_modes_str += ",";
    365     base::StringAppendF(&display_modes_str,
    366                         "(%dx%d@%f%c%s)",
    367                         iter->size.width(),
    368                         iter->size.height(),
    369                         iter->refresh_rate,
    370                         iter->interlaced ? 'I' : 'P',
    371                         iter->native ? "(N)" : "");
    372   }
    373   return ToString() + ", display_modes==" + display_modes_str;
    374 }
    375 
    376 void DisplayInfo::SetColorProfile(ui::ColorCalibrationProfile profile) {
    377   if (IsColorProfileAvailable(profile))
    378     color_profile_ = profile;
    379 }
    380 
    381 bool DisplayInfo::IsColorProfileAvailable(
    382     ui::ColorCalibrationProfile profile) const {
    383   return std::find(available_color_profiles_.begin(),
    384                    available_color_profiles_.end(),
    385                    profile) != available_color_profiles_.end();
    386 }
    387 
    388 }  // namespace ash
    389