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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 CONTENT_COMMON_MAC_FONT_LOADER_H_
#define CONTENT_COMMON_MAC_FONT_LOADER_H_
#include <CoreText/CoreText.h>
#include <stdint.h>
#include <memory>
#include <string>
#include "base/callback_forward.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "content/common/content_export.h"
namespace content {
// Provides functionality to transmit fonts over IPC.
//
// Note about font formats: .dfont (datafork suitcase) fonts are currently not
// supported by this code since CGFontCreateWithDataProvider() can't handle them
// directly.
class FontLoader {
public:
// Internal font load result data. Exposed here for testing.
struct CONTENT_EXPORT ResultInternal {
ResultInternal();
~ResultInternal();
base::ReadOnlySharedMemoryRegion font_data;
uint32_t font_id = 0;
};
// Callback for the reporting result of LoadFont().
// - The base::ReadOnlySharedMemoryRegion points to a shared memory region
// containing the raw data for the font file.
// - The last argument is the font_id: a unique identifier for the on-disk
// file we load for the font.
using LoadedCallback =
base::OnceCallback<void(base::ReadOnlySharedMemoryRegion, uint32_t)>;
// Load a font specified by |font| into a shared memory buffer suitable for
// sending over IPC. On failure, zeroes and an invalid handle are reported
// to the callback.
CONTENT_EXPORT
static void LoadFont(const std::u16string& font_name,
float font_point_size,
LoadedCallback callback);
// Given a shared memory region containing the raw data for a font file, load
// the font and turn them into a CTFontDescriptor.
//
// |data| - A shared memory region contained the raw data from a font file.
// |data_size| - Size of |data|.
//
// On return:
// returns true on success, false on failure.
// |out| - A CTFontDescriptorRef corresponding to the designated font buffer.
// The caller is responsible for releasing this value via CFRelease().
CONTENT_EXPORT
static bool CTFontDescriptorFromBuffer(
base::ReadOnlySharedMemoryRegion font_data,
base::ScopedCFTypeRef<CTFontDescriptorRef>* out_descriptor);
CONTENT_EXPORT
static std::unique_ptr<ResultInternal> LoadFontForTesting(
const std::u16string& font_name,
float font_point_size);
};
} // namespace content
#endif // CONTENT_COMMON_MAC_FONT_LOADER_H_
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