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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_BASE_RESOURCE_RESOURCE_SCALE_FACTOR_H_
#define UI_BASE_RESOURCE_RESOURCE_SCALE_FACTOR_H_
#include <memory>
#include <vector>
#include "base/component_export.h"
namespace ui {
// Supported resource scale factors for the platform. This is used as an index
// into the array `kResourceScaleFactorScales` which maps the enum value to a
// float. `kScaleFactorNone` is used for density independent resources such as
// string, html/js files or an image that can be used for any scale factors
// (such as wallpapers).
enum ResourceScaleFactor : int {
kScaleFactorNone = 0,
k100Percent,
k200Percent,
k300Percent,
NUM_SCALE_FACTORS // This always appears last.
};
// Returns the image scale for the scale factor passed in.
COMPONENT_EXPORT(UI_DATA_PACK)
float GetScaleForResourceScaleFactor(ResourceScaleFactor scale_factor);
// Changes the value of `GetSupportedScaleFactors` to `scale_factors`. Use
// `ScopedSetSupportedResourceScaleFactors` for unit tests to avoid affecting
// the state of other tests.
COMPONENT_EXPORT(UI_DATA_PACK)
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_DATA_PACK)
const std::vector<ResourceScaleFactor>& GetSupportedResourceScaleFactors();
// Returns the supported ResourceScaleFactor which most closely matches `scale`.
COMPONENT_EXPORT(UI_DATA_PACK)
ResourceScaleFactor GetSupportedResourceScaleFactor(float scale);
// Returns a resource scale factor value that can be used to load a resource
// that will later be scaled to `scale` minimizing quality loss. This means
// that, instead of the closest resource scale factor, it might return a
// resource meant for a bigger scale factor.
COMPONENT_EXPORT(UI_DATA_PACK)
ResourceScaleFactor GetSupportedResourceScaleFactorForRescale(float scale);
// Returns the maximum supported ResourceScaleFactor.
COMPONENT_EXPORT(UI_DATA_PACK)
ResourceScaleFactor GetMaxSupportedResourceScaleFactor();
// Returns the maximum supported ResourceScaleFactor as a float.
COMPONENT_EXPORT(UI_DATA_PACK)
float GetScaleForMaxSupportedResourceScaleFactor();
// Returns true if the scale passed in is the list of supported scales for
// the platform.
COMPONENT_EXPORT(UI_DATA_PACK)
bool IsScaleFactorSupported(ResourceScaleFactor scale_factor);
namespace test {
// Class which changes the value of GetSupportedResourceScaleFactors() to
// `new_scale_factors` for the duration of its lifetime.
class COMPONENT_EXPORT(UI_DATA_PACK) ScopedSetSupportedResourceScaleFactors {
public:
explicit ScopedSetSupportedResourceScaleFactors(
const std::vector<ResourceScaleFactor>& new_scale_factors);
ScopedSetSupportedResourceScaleFactors(
const ScopedSetSupportedResourceScaleFactors&) = delete;
ScopedSetSupportedResourceScaleFactors& operator=(
const ScopedSetSupportedResourceScaleFactors&) = delete;
~ScopedSetSupportedResourceScaleFactors();
private:
std::unique_ptr<std::vector<ResourceScaleFactor>> original_scale_factors_;
};
} // namespace test
} // namespace ui
#endif // UI_BASE_RESOURCE_RESOURCE_SCALE_FACTOR_H_
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