pdfium_font_linux.cc | Explore in Territory

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "pdf/pdfium/pdfium_font_linux.h"

#include <stddef.h>
#include <stdint.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include <algorithm>
#include <limits>
#include <memory>
#include <string>

#include "base/check_op.h"
#include "base/containers/heap_array.h"
#include "base/containers/span.h"
#include "base/files/file.h"
#include "base/i18n/encoding_detection.h"
#include "base/i18n/icu_string_conversions.h"
#include "base/no_destructor.h"
#include "base/numerics/byte_conversions.h"
#include "base/numerics/safe_conversions.h"
#include "base/posix/eintr_wrapper.h"
#include "base/sequence_checker.h"
#include "base/strings/string_util.h"
#include "components/services/font/public/cpp/font_loader.h"
#include "pdf/pdfium/pdfium_engine.h"
#include "pdf/pdfium/pdfium_font_helpers.h"
#include "third_party/blink/public/platform/web_font_description.h"
#include "third_party/pdfium/public/fpdf_sysfontinfo.h"

namespace chrome_pdf {

namespace {

// GetFontTable loads a specified font table from an open SFNT file.
//   fd: a file descriptor to the SFNT file. The position doesn't matter.
//   table_tag: the table tag in *big-endian* format, or 0 for the entire font.
//   output: a buffer of size output_length that gets the data.  can be 0, in
//     which case output_length will be set to the required size in bytes.
//   output_length: size of output, if it's not 0.
//
//   returns: true on success.
//
// TODO(drott): This should be should be replaced with using FreeType for the
// purpose instead of reimplementing table parsing.
bool GetFontTable(int fd,
                  uint32_t table_tag,
                  uint8_t* output,
                  size_t* output_length) { … }

// Maps font description and charset to `FontId` as requested by PDFium, with
// `FontId` as an opaque type that PDFium works with. Based on the `FontId`,
// PDFium can read from the font files using GetFontData(). Properly frees the
// underlying resource type when PDFium is done with the mapped font.
class BlinkFontMapper { … };

BlinkFontMapper& GetBlinkFontMapper() { … }

// This list is for CPWL_FontMap::GetDefaultFontByCharset().
// We pretend to have these font natively and let the browser (or underlying
// fontconfig) pick the proper font on the system.
void EnumFonts(FPDF_SYSFONTINFO* sysfontinfo, void* mapper) { … }

void* MapFont(FPDF_SYSFONTINFO*,
              int weight,
              int italic,
              int charset,
              int pitch_family,
              const char* face,
              int* exact) { … }

unsigned long GetFontData(FPDF_SYSFONTINFO*,
                          void* font_id,
                          unsigned int table,
                          unsigned char* buffer,
                          unsigned long buf_size) { … }

void DeleteFont(FPDF_SYSFONTINFO*, void* font_id) { … }

FPDF_SYSFONTINFO g_font_info = …;

}  // namespace

void InitializeLinuxFontMapper() { … }

}  // namespace chrome_pdf
chromium/pdf/pdfium/pdfium_font_linux.cc
