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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.
#ifndef UI_BASE_LAYOUT_H_
#define UI_BASE_LAYOUT_H_
#include <vector>
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "build/build_config.h"
#include "ui/base/resource/resource_scale_factor.h"
#include "ui/gfx/native_widget_types.h"
namespace ui {
// Changes the value of GetSupportedScaleFactors() to |scale_factors|.
// Use ScopedSetSupportedScaleFactors for unit tests as not to affect the
// state of other tests.
COMPONENT_EXPORT(UI_BASE)
void SetSupportedResourceScaleFactors(
const std::vector<ResourceScaleFactor>& scale_factors);
// Returns a vector with the scale factors which are supported by this
// platform, in ascending order.
COMPONENT_EXPORT(UI_BASE)
const std::vector<ResourceScaleFactor>& GetSupportedResourceScaleFactors();
// Returns the supported ResourceScaleFactor which most closely matches |scale|.
// Converting from float to ResourceScaleFactor is inefficient and should be
// done as little as possible.
COMPONENT_EXPORT(UI_BASE)
ResourceScaleFactor GetSupportedResourceScaleFactor(float image_scale);
// Returns the ResourceScaleFactor used by |view|.
COMPONENT_EXPORT(UI_BASE)
float GetScaleFactorForNativeView(gfx::NativeView view);
// Returns true if the scale passed in is the list of supported scales for
// the platform.
// TODO(oshima): Deprecate this.
COMPONENT_EXPORT(UI_BASE) bool IsSupportedScale(float scale);
namespace test {
// Class which changes the value of GetSupportedResourceScaleFactors() to
// |new_scale_factors| for the duration of its lifetime.
class COMPONENT_EXPORT(UI_BASE) ScopedSetSupportedResourceScaleFactors {
public:
explicit ScopedSetSupportedResourceScaleFactors(
const std::vector<ResourceScaleFactor>& new_scale_factors);
ScopedSetSupportedResourceScaleFactors(
const ScopedSetSupportedResourceScaleFactors&) = delete;
ScopedSetSupportedResourceScaleFactors& operator=(
const ScopedSetSupportedResourceScaleFactors&) = delete;
~ScopedSetSupportedResourceScaleFactors();
private:
raw_ptr<std::vector<ResourceScaleFactor>> original_scale_factors_;
};
} // namespace test
} // namespace ui
#endif // UI_BASE_LAYOUT_H_
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