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// Copyright 2012 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_HANDLE_H_
#define UI_BASE_RESOURCE_RESOURCE_HANDLE_H_
#include <stdint.h>
#include <optional>
#include <string_view>
#include <vector>
#include "base/component_export.h"
#include "base/dcheck_is_on.h"
#include "ui/base/resource/resource_scale_factor.h"
namespace base {
class RefCountedStaticMemory;
}
namespace ui {
class COMPONENT_EXPORT(UI_DATA_PACK) ResourceHandle {
public:
// What type of encoding the text resources use.
enum TextEncodingType {
BINARY,
UTF8,
UTF16
};
virtual ~ResourceHandle() {}
// Returns true if the DataPack contains a resource with id |resource_id|.
virtual bool HasResource(uint16_t resource_id) const = 0;
// Get resource by id |resource_id|, filling in |data|.
// The data is owned by the DataPack object and should not be modified.
// Returns false if the resource id isn't found.
virtual std::optional<std::string_view> GetStringView(
uint16_t resource_id) const = 0;
// Like GetStringView(), but returns a reference to memory.
// Caller owns the returned object.
virtual base::RefCountedStaticMemory* GetStaticMemory(
uint16_t resource_id) const = 0;
// Get the encoding type of text resources.
virtual TextEncodingType GetTextEncodingType() const = 0;
// The scale of images in this resource pack relative to images in the 1x
// resource pak.
virtual ResourceScaleFactor GetResourceScaleFactor() const = 0;
#if DCHECK_IS_ON()
// Checks to see if any resource in this DataPack already exists in the list
// of resources.
virtual void CheckForDuplicateResources(
const std::vector<std::unique_ptr<ResourceHandle>>& packs) = 0;
#endif
};
} // namespace ui
#endif // UI_BASE_RESOURCE_RESOURCE_HANDLE_H_
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