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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/base/layout.h"
#include <stddef.h>
#include <algorithm>
#include <cmath>
#include <limits>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/macros.h"
#include "build/build_config.h"
#include "ui/base/touch/touch_device.h"
#include "ui/base/ui_base_switches.h"
#include "ui/gfx/display.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/screen.h"
namespace ui {
namespace {
std::vector<ScaleFactor>* g_supported_scale_factors = NULL;
} // namespace
void SetSupportedScaleFactors(
const std::vector<ui::ScaleFactor>& scale_factors) {
if (g_supported_scale_factors != NULL)
delete g_supported_scale_factors;
g_supported_scale_factors = new std::vector<ScaleFactor>(scale_factors);
std::sort(g_supported_scale_factors->begin(),
g_supported_scale_factors->end(),
[](ScaleFactor lhs, ScaleFactor rhs) {
return GetScaleForScaleFactor(lhs) < GetScaleForScaleFactor(rhs);
});
// Set ImageSkia's supported scales.
std::vector<float> scales;
for (std::vector<ScaleFactor>::const_iterator it =
g_supported_scale_factors->begin();
it != g_supported_scale_factors->end(); ++it) {
scales.push_back(GetScaleForScaleFactor(*it));
}
gfx::ImageSkia::SetSupportedScales(scales);
}
const std::vector<ScaleFactor>& GetSupportedScaleFactors() {
DCHECK(g_supported_scale_factors != NULL);
return *g_supported_scale_factors;
}
ScaleFactor GetSupportedScaleFactor(float scale) {
DCHECK(g_supported_scale_factors != NULL);
ScaleFactor closest_match = SCALE_FACTOR_100P;
float smallest_diff = std::numeric_limits<float>::max();
for (size_t i = 0; i < g_supported_scale_factors->size(); ++i) {
ScaleFactor scale_factor = (*g_supported_scale_factors)[i];
float diff = std::abs(GetScaleForScaleFactor(scale_factor) - scale);
if (diff < smallest_diff) {
closest_match = scale_factor;
smallest_diff = diff;
}
}
DCHECK_NE(closest_match, SCALE_FACTOR_NONE);
return closest_match;
}
bool IsSupportedScale(float scale) {
for (auto scale_factor_idx : *g_supported_scale_factors) {
if (GetScaleForScaleFactor(scale_factor_idx) == scale)
return true;
}
return false;
}
namespace test {
ScopedSetSupportedScaleFactors::ScopedSetSupportedScaleFactors(
const std::vector<ui::ScaleFactor>& new_scale_factors) {
if (g_supported_scale_factors) {
original_scale_factors_ =
new std::vector<ScaleFactor>(*g_supported_scale_factors);
} else {
original_scale_factors_ = NULL;
}
SetSupportedScaleFactors(new_scale_factors);
}
ScopedSetSupportedScaleFactors::~ScopedSetSupportedScaleFactors() {
if (original_scale_factors_) {
SetSupportedScaleFactors(*original_scale_factors_);
delete original_scale_factors_;
} else {
delete g_supported_scale_factors;
g_supported_scale_factors = NULL;
}
}
} // namespace test
#if !defined(OS_MACOSX)
float GetScaleFactorForNativeView(gfx::NativeView view) {
return gfx::Screen::GetScreen()
->GetDisplayNearestWindow(view)
.device_scale_factor();
}
#endif // !defined(OS_MACOSX)
} // namespace ui
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