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// Copyright 2014 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 "ash/display/display_util.h"
#include <algorithm>
#include "ash/display/display_info.h"
#if defined(OS_CHROMEOS)
#include "base/sys_info.h"
#endif
namespace ash {
namespace {
// List of value UI Scale values. Scales for 2x are equivalent to 640,
// 800, 1024, 1280, 1440, 1600 and 1920 pixel width respectively on
// 2560 pixel width 2x density display. Please see crbug.com/233375
// for the full list of resolutions.
const float kUIScalesFor2x[] =
{0.5f, 0.625f, 0.8f, 1.0f, 1.125f, 1.25f, 1.5f, 2.0f};
const float kUIScalesFor1_25x[] = {0.5f, 0.625f, 0.8f, 1.0f, 1.25f };
const float kUIScalesFor1280[] = {0.5f, 0.625f, 0.8f, 1.0f, 1.125f };
const float kUIScalesFor1366[] = {0.5f, 0.6f, 0.75f, 1.0f, 1.125f };
std::vector<float> GetScalesForDisplay(const DisplayMode& native_mode) {
#define ASSIGN_ARRAY(v, a) v.assign(a, a + arraysize(a))
std::vector<float> ret;
if (native_mode.device_scale_factor == 2.0f) {
ASSIGN_ARRAY(ret, kUIScalesFor2x);
return ret;
} else if (native_mode.device_scale_factor == 1.25f) {
ASSIGN_ARRAY(ret, kUIScalesFor1_25x);
return ret;
}
switch (native_mode.size.width()) {
case 1280:
ASSIGN_ARRAY(ret, kUIScalesFor1280);
break;
case 1366:
ASSIGN_ARRAY(ret, kUIScalesFor1366);
break;
default:
ASSIGN_ARRAY(ret, kUIScalesFor1280);
#if defined(OS_CHROMEOS)
if (base::SysInfo::IsRunningOnChromeOS())
NOTREACHED() << "Unknown resolution:" << native_mode.size.ToString();
#endif
}
return ret;
}
struct ScaleComparator {
explicit ScaleComparator(float s) : scale(s) {}
bool operator()(const DisplayMode& mode) const {
const float kEpsilon = 0.0001f;
return std::abs(scale - mode.ui_scale) < kEpsilon;
}
float scale;
};
} // namespace
std::vector<DisplayMode> CreateInternalDisplayModeList(
const DisplayMode& native_mode) {
std::vector<DisplayMode> display_mode_list;
float native_ui_scale = (native_mode.device_scale_factor == 1.25f)
? 1.0f
: native_mode.device_scale_factor;
for (float ui_scale : GetScalesForDisplay(native_mode)) {
DisplayMode mode = native_mode;
mode.ui_scale = ui_scale;
mode.native = (ui_scale == native_ui_scale);
display_mode_list.push_back(mode);
}
return display_mode_list;
}
// static
float GetNextUIScale(const DisplayInfo& info, bool up) {
ScaleComparator comparator(info.configured_ui_scale());
const std::vector<DisplayMode>& modes = info.display_modes();
for (auto iter = modes.begin(); iter != modes.end(); ++iter) {
if (comparator(*iter)) {
if (up && (iter + 1) != modes.end())
return (iter + 1)->ui_scale;
if (!up && iter != modes.begin())
return (iter - 1)->ui_scale;
return info.configured_ui_scale();
}
}
// Fallback to 1.0f if the |scale| wasn't in the list.
return 1.0f;
}
bool HasDisplayModeForUIScale(const DisplayInfo& info, float ui_scale) {
ScaleComparator comparator(ui_scale);
const std::vector<DisplayMode>& modes = info.display_modes();
return std::find_if(modes.begin(), modes.end(), comparator) != modes.end();
}
} // namespace ash
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