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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/display/display.h"
#include <algorithm>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "build/build_config.h"
#include "ui/display/display_switches.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/geometry/point_conversions.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/size_conversions.h"
namespace display {
namespace {
// This variable tracks whether the forced device scale factor switch needs to
// be read from the command line, i.e. if it is set to -1 then the command line
// is checked.
int g_has_forced_device_scale_factor = -1;
// This variable caches the forced device scale factor value which is read off
// the command line. If the cache is invalidated by setting this variable to
// -1.0, we read the forced device scale factor again.
float g_forced_device_scale_factor = -1.0;
bool HasForceDeviceScaleFactorImpl() {
return base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kForceDeviceScaleFactor);
}
float GetForcedDeviceScaleFactorImpl() {
double scale_in_double = 1.0;
if (HasForceDeviceScaleFactorImpl()) {
std::string value =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kForceDeviceScaleFactor);
if (!base::StringToDouble(value, &scale_in_double)) {
LOG(ERROR) << "Failed to parse the default device scale factor:" << value;
scale_in_double = 1.0;
}
}
return static_cast<float>(scale_in_double);
}
int64_t internal_display_id_ = -1;
} // namespace
// static
float Display::GetForcedDeviceScaleFactor() {
if (g_forced_device_scale_factor < 0)
g_forced_device_scale_factor = GetForcedDeviceScaleFactorImpl();
return g_forced_device_scale_factor;
}
// static
bool Display::HasForceDeviceScaleFactor() {
if (g_has_forced_device_scale_factor == -1)
g_has_forced_device_scale_factor = HasForceDeviceScaleFactorImpl();
return !!g_has_forced_device_scale_factor;
}
// static
void Display::ResetForceDeviceScaleFactorForTesting() {
g_has_forced_device_scale_factor = -1;
g_forced_device_scale_factor = -1.0;
}
constexpr int DEFAULT_BITS_PER_PIXEL = 24;
constexpr int DEFAULT_BITS_PER_COMPONENT = 8;
Display::Display() : Display(kInvalidDisplayId) {}
Display::Display(int64_t id) : Display(id, gfx::Rect()) {}
Display::Display(int64_t id, const gfx::Rect& bounds)
: id_(id),
bounds_(bounds),
work_area_(bounds),
device_scale_factor_(GetForcedDeviceScaleFactor()),
color_depth_(DEFAULT_BITS_PER_PIXEL),
depth_per_component_(DEFAULT_BITS_PER_COMPONENT) {
#if defined(USE_AURA)
SetScaleAndBounds(device_scale_factor_, bounds);
#endif
}
Display::Display(const Display& other) = default;
Display::~Display() {}
int Display::RotationAsDegree() const {
switch (rotation_) {
case ROTATE_0:
return 0;
case ROTATE_90:
return 90;
case ROTATE_180:
return 180;
case ROTATE_270:
return 270;
}
NOTREACHED();
return 0;
}
void Display::SetRotationAsDegree(int rotation) {
switch (rotation) {
case 0:
rotation_ = ROTATE_0;
break;
case 90:
rotation_ = ROTATE_90;
break;
case 180:
rotation_ = ROTATE_180;
break;
case 270:
rotation_ = ROTATE_270;
break;
default:
// We should not reach that but we will just ignore the call if we do.
NOTREACHED();
}
}
gfx::Insets Display::GetWorkAreaInsets() const {
return gfx::Insets(work_area_.y() - bounds_.y(), work_area_.x() - bounds_.x(),
bounds_.bottom() - work_area_.bottom(),
bounds_.right() - work_area_.right());
}
void Display::SetScaleAndBounds(float device_scale_factor,
const gfx::Rect& bounds_in_pixel) {
gfx::Insets insets = bounds_.InsetsFrom(work_area_);
if (!HasForceDeviceScaleFactor()) {
#if defined(OS_MACOSX)
// Unless an explicit scale factor was provided for testing, ensure the
// scale is integral.
device_scale_factor = static_cast<int>(device_scale_factor);
#endif
device_scale_factor_ = device_scale_factor;
}
device_scale_factor_ = std::max(1.0f, device_scale_factor_);
bounds_ = gfx::Rect(gfx::ScaleToFlooredPoint(bounds_in_pixel.origin(),
1.0f / device_scale_factor_),
gfx::ScaleToFlooredSize(bounds_in_pixel.size(),
1.0f / device_scale_factor_));
#if defined(OS_ANDROID)
size_in_pixels_ = bounds_in_pixel.size();
#endif // defined(OS_ANDROID)
UpdateWorkAreaFromInsets(insets);
}
void Display::SetSize(const gfx::Size& size_in_pixel) {
gfx::Point origin = bounds_.origin();
#if defined(USE_AURA)
origin = gfx::ScaleToFlooredPoint(origin, device_scale_factor_);
#endif
SetScaleAndBounds(device_scale_factor_, gfx::Rect(origin, size_in_pixel));
}
void Display::UpdateWorkAreaFromInsets(const gfx::Insets& insets) {
work_area_ = bounds_;
work_area_.Inset(insets);
}
gfx::Size Display::GetSizeInPixel() const {
// TODO(oshima): This should always use size_in_pixels_.
if (!size_in_pixels_.IsEmpty())
return size_in_pixels_;
return gfx::ScaleToFlooredSize(size(), device_scale_factor_);
}
std::string Display::ToString() const {
return base::StringPrintf(
"Display[%lld] bounds=%s, workarea=%s, scale=%g, %s",
static_cast<long long int>(id_), bounds_.ToString().c_str(),
work_area_.ToString().c_str(), device_scale_factor_,
IsInternal() ? "internal" : "external");
}
bool Display::IsInternal() const {
return is_valid() && (id_ == internal_display_id_);
}
// static
int64_t Display::InternalDisplayId() {
DCHECK_NE(kInvalidDisplayId, internal_display_id_);
return internal_display_id_;
}
// static
void Display::SetInternalDisplayId(int64_t internal_display_id) {
internal_display_id_ = internal_display_id;
}
// static
bool Display::IsInternalDisplayId(int64_t display_id) {
DCHECK_NE(kInvalidDisplayId, display_id);
return HasInternalDisplay() && internal_display_id_ == display_id;
}
// static
bool Display::HasInternalDisplay() {
return internal_display_id_ != kInvalidDisplayId;
}
} // namespace display
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