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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 "content/common/mac/font_loader.h"
#import <Cocoa/Cocoa.h>
#include <CoreText/CoreText.h>
#include <limits>
#include "base/bind.h"
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#import "base/mac/foundation_util.h"
#include "base/mac/scoped_cftyperef.h"
#import "base/mac/scoped_nsobject.h"
#include "base/strings/string16.h"
#include "base/strings/sys_string_conversions.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/threading/scoped_blocking_call.h"
namespace content {
namespace {
std::unique_ptr<FontLoader::ResultInternal> LoadFontOnFileThread(
const base::string16& font_name,
const float font_point_size) {
base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
base::BlockingType::MAY_BLOCK);
NSString* font_name_ns = base::SysUTF16ToNSString(font_name);
NSFont* font_to_encode =
[NSFont fontWithName:font_name_ns size:font_point_size];
// Load appropriate NSFont.
if (!font_to_encode) {
DLOG(ERROR) << "Failed to load font " << font_name;
return nullptr;
}
// NSFont -> File path.
// Warning: Calling this function on a font activated from memory will result
// in failure with a -50 - paramErr. This may occur if
// CreateCGFontFromBuffer() is called in the same process as this function
// e.g. when writing a unit test that exercises these two functions together.
// If said unit test were to load a system font and activate it from memory
// it becomes impossible for the system to the find the original file ref
// since the font now lives in memory as far as it's concerned.
CTFontRef ct_font = base::mac::NSToCFCast(font_to_encode);
base::scoped_nsobject<NSURL> font_url(
base::mac::CFToNSCast(base::mac::CFCastStrict<CFURLRef>(
CTFontCopyAttribute(ct_font, kCTFontURLAttribute))));
if (![font_url isFileURL]) {
DLOG(ERROR) << "Failed to find font file for " << font_name;
return nullptr;
}
base::FilePath font_path = base::mac::NSStringToFilePath([font_url path]);
// Load file into shared memory buffer.
int64_t font_file_size_64 = -1;
if (!base::GetFileSize(font_path, &font_file_size_64)) {
DLOG(ERROR) << "Couldn't get font file size for " << font_path.value();
return nullptr;
}
if (font_file_size_64 <= 0 ||
font_file_size_64 >= std::numeric_limits<int32_t>::max()) {
DLOG(ERROR) << "Bad size for font file " << font_path.value();
return nullptr;
}
auto result = std::make_unique<FontLoader::ResultInternal>();
int32_t font_file_size_32 = static_cast<int32_t>(font_file_size_64);
result->font_data = mojo::SharedBufferHandle::Create(font_file_size_32);
if (!result->font_data.is_valid()) {
DLOG(ERROR) << "Failed to create shmem area for " << font_name;
return nullptr;
}
mojo::ScopedSharedBufferMapping mapping =
result->font_data->Map(font_file_size_32);
if (!mapping) {
DLOG(ERROR) << "Failed to create shmem mapping for " << font_name;
return nullptr;
}
int32_t amt_read = base::ReadFile(
font_path, static_cast<char*>(mapping.get()), font_file_size_32);
if (amt_read != font_file_size_32) {
DLOG(ERROR) << "Failed to read font data for " << font_path.value();
return nullptr;
}
// Font loading used to call ATSFontGetContainer() and used that as font id.
// ATS is deprecated. CoreText offers up the ATSFontRef typeface ID via
// CTFontGetPlatformFont.
result->font_id = CTFontGetPlatformFont(ct_font, nil);
if (result->font_id == 0) {
DLOG(ERROR) << "Failed to get font id for " << font_path.value();
return nullptr;
}
return result;
}
void ReplyOnUIThread(FontLoader::LoadedCallback callback,
std::unique_ptr<FontLoader::ResultInternal> result) {
if (!result) {
std::move(callback).Run(mojo::ScopedSharedBufferHandle(), 0);
return;
}
DCHECK_NE(0u, result->font_id);
std::move(callback).Run(std::move(result->font_data), result->font_id);
}
} // namespace
FontLoader::ResultInternal::ResultInternal() = default;
FontLoader::ResultInternal::~ResultInternal() = default;
// static
void FontLoader::LoadFont(const base::string16& font_name,
const float font_point_size,
LoadedCallback callback) {
// Tasks are triggered when font loading in the sandbox fails. Usually due to
// a user installing a third-party font manager. See crbug.com/72727. Web page
// rendering can't continue until a font is returned.
constexpr base::TaskTraits kTraits = {
base::MayBlock(), base::TaskPriority::USER_VISIBLE,
base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN};
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, kTraits,
base::BindOnce(&LoadFontOnFileThread, font_name, font_point_size),
base::BindOnce(&ReplyOnUIThread, std::move(callback)));
}
// static
bool FontLoader::CTFontDescriptorFromBuffer(
mojo::ScopedSharedBufferHandle font_data,
uint32_t font_data_size,
base::ScopedCFTypeRef<CTFontDescriptorRef>* out_descriptor) {
out_descriptor->reset();
mojo::ScopedSharedBufferMapping mapping = font_data->Map(font_data_size);
if (!mapping)
return false;
NSData* data = [NSData dataWithBytes:mapping.get() length:font_data_size];
base::ScopedCFTypeRef<CTFontDescriptorRef> data_descriptor(
CTFontManagerCreateFontDescriptorFromData(base::mac::NSToCFCast(data)));
if (!data_descriptor)
return false;
*out_descriptor = std::move(data_descriptor);
return true;
}
// static
std::unique_ptr<FontLoader::ResultInternal> FontLoader::LoadFontForTesting(
const base::string16& font_name,
const float font_point_size) {
return LoadFontOnFileThread(font_name, font_point_size);
}
} // namespace content
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