src/ui/gfx/display.cc

   1 // Copyright (c) 2012 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/display.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/command_line.h"
  10 #include "base/logging.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "base/strings/stringprintf.h"
  13 #include "ui/gfx/insets.h"
  14 #include "ui/gfx/point_conversions.h"
  15 #include "ui/gfx/point_f.h"
  16 #include "ui/gfx/size_conversions.h"
  17 #include "ui/gfx/switches.h"
  18
  19 namespace gfx {
  20 namespace {
  21
  22 bool HasForceDeviceScaleFactorImpl() {
  23   return CommandLine::ForCurrentProcess()->HasSwitch(
  24       switches::kForceDeviceScaleFactor);
  25 }
  26
  27 float GetForcedDeviceScaleFactorImpl() {
  28   double scale_in_double = 1.0;
  29   if (HasForceDeviceScaleFactorImpl()) {
  30     std::string value = CommandLine::ForCurrentProcess()->
  31         GetSwitchValueASCII(switches::kForceDeviceScaleFactor);
  32     if (!base::StringToDouble(value, &scale_in_double))
  33       LOG(ERROR) << "Failed to parse the default device scale factor:" << value;
  34   }
  35   return static_cast<float>(scale_in_double);
  36 }
  37
  38 int64 internal_display_id_ = -1;
  39
  40 }  // namespace
  41
  42 const int64 Display::kInvalidDisplayID = -1;
  43
  44 // static
  45 float Display::GetForcedDeviceScaleFactor() {
  46   static const float kForcedDeviceScaleFactor =
  47       GetForcedDeviceScaleFactorImpl();
  48   return kForcedDeviceScaleFactor;
  49 }
  50
  51 //static
  52 bool Display::HasForceDeviceScaleFactor() {
  53   static const bool kHasForceDeviceScaleFactor =
  54       HasForceDeviceScaleFactorImpl();
  55   return kHasForceDeviceScaleFactor;
  56 }
  57
  58 Display::Display()
  59     : id_(kInvalidDisplayID),
  60       device_scale_factor_(GetForcedDeviceScaleFactor()),
  61       rotation_(ROTATE_0),
  62       touch_support_(TOUCH_SUPPORT_UNKNOWN) {
  63 }
  64
  65 Display::Display(int64 id)
  66     : id_(id),
  67       device_scale_factor_(GetForcedDeviceScaleFactor()),
  68       rotation_(ROTATE_0),
  69       touch_support_(TOUCH_SUPPORT_UNKNOWN) {
  70 }
  71
  72 Display::Display(int64 id, const gfx::Rect& bounds)
  73     : id_(id),
  74       bounds_(bounds),
  75       work_area_(bounds),
  76       device_scale_factor_(GetForcedDeviceScaleFactor()),
  77       rotation_(ROTATE_0),
  78       touch_support_(TOUCH_SUPPORT_UNKNOWN) {
  79 #if defined(USE_AURA)
  80   SetScaleAndBounds(device_scale_factor_, bounds);
  81 #endif
  82 }
  83
  84 Display::~Display() {
  85 }
  86
  87 int Display::RotationAsDegree() const {
  88   switch (rotation_) {
  89     case ROTATE_0:
  90       return 0;
  91     case ROTATE_90:
  92       return 90;
  93     case ROTATE_180:
  94       return 180;
  95     case ROTATE_270:
  96       return 270;
  97   }
  98
  99   NOTREACHED();
 100   return 0;
 101 }
 102
 103 void Display::SetRotationAsDegree(int rotation) {
 104   switch (rotation) {
 105     case 0:
 106       rotation_ = ROTATE_0;
 107       break;
 108     case 90:
 109       rotation_ = ROTATE_90;
 110       break;
 111     case 180:
 112       rotation_ = ROTATE_180;
 113       break;
 114     case 270:
 115       rotation_ = ROTATE_270;
 116       break;
 117     default:
 118       // We should not reach that but we will just ignore the call if we do.
 119       NOTREACHED();
 120   }
 121 }
 122
 123 Insets Display::GetWorkAreaInsets() const {
 124   return gfx::Insets(work_area_.y() - bounds_.y(),
 125                      work_area_.x() - bounds_.x(),
 126                      bounds_.bottom() - work_area_.bottom(),
 127                      bounds_.right() - work_area_.right());
 128 }
 129
 130 void Display::SetScaleAndBounds(
 131     float device_scale_factor,
 132     const gfx::Rect& bounds_in_pixel) {
 133   Insets insets = bounds_.InsetsFrom(work_area_);
 134   if (!HasForceDeviceScaleFactor()) {
 135 #if defined(OS_MACOSX)
 136     // Unless an explicit scale factor was provided for testing, ensure the
 137     // scale is integral.
 138     device_scale_factor = static_cast<int>(device_scale_factor);
 139 #endif
 140     device_scale_factor_ = device_scale_factor;
 141   }
 142   device_scale_factor_ = std::max(1.0f, device_scale_factor_);
 143   bounds_ = gfx::Rect(
 144       gfx::ToFlooredPoint(gfx::ScalePoint(bounds_in_pixel.origin(),
 145                                           1.0f / device_scale_factor_)),
 146       gfx::ToFlooredSize(gfx::ScaleSize(bounds_in_pixel.size(),
 147                                         1.0f / device_scale_factor_)));
 148   UpdateWorkAreaFromInsets(insets);
 149 }
 150
 151 void Display::SetSize(const gfx::Size& size_in_pixel) {
 152   gfx::Point origin = bounds_.origin();
 153 #if defined(USE_AURA)
 154   gfx::PointF origin_f = origin;
 155   origin_f.Scale(device_scale_factor_);
 156   origin = gfx::ToFlooredPoint(origin_f);
 157 #endif
 158   SetScaleAndBounds(device_scale_factor_, gfx::Rect(origin, size_in_pixel));
 159 }
 160
 161 void Display::UpdateWorkAreaFromInsets(const gfx::Insets& insets) {
 162   work_area_ = bounds_;
 163   work_area_.Inset(insets);
 164 }
 165
 166 gfx::Size Display::GetSizeInPixel() const {
 167   return gfx::ToFlooredSize(gfx::ScaleSize(size(), device_scale_factor_));
 168 }
 169
 170 std::string Display::ToString() const {
 171   return base::StringPrintf(
 172       "Display[%lld] bounds=%s, workarea=%s, scale=%f, %s",
 173       static_cast<long long int>(id_),
 174       bounds_.ToString().c_str(),
 175       work_area_.ToString().c_str(),
 176       device_scale_factor_,
 177       IsInternal() ? "internal" : "external");
 178 }
 179
 180 bool Display::IsInternal() const {
 181   return is_valid() && (id_ == internal_display_id_);
 182 }
 183
 184 int64 Display::InternalDisplayId() {
 185   return internal_display_id_;
 186 }
 187
 188 void Display::SetInternalDisplayId(int64 internal_display_id) {
 189   internal_display_id_ = internal_display_id;
 190 }
 191
 192 }  // namespace gfx