fx_font.h

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// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
#ifndef CORE_FXGE_FX_FONT_H_
#define CORE_FXGE_FX_FONT_H_
 
#include <stdint.h>
 
#include <vector>
 
#include "core/fxcrt/bytestring.h"
#include "core/fxcrt/fx_coordinates.h"
#include "core/fxcrt/span.h"
 
/* Font pitch and family flags */
#define FXFONT_FF_FIXEDPITCH (1 << 0)
#define FXFONT_FF_ROMAN (1 << 4)
#define FXFONT_FF_SCRIPT (4 << 4)
 
/* Typical weight values */
#define FXFONT_FW_NORMAL 400
#define FXFONT_FW_BOLD 700
#define FXFONT_FW_BOLD_BOLD 900
 
/* Font styles as defined in PDF 1.7 Table 5.20 */
#define FXFONT_NORMAL (0)
#define FXFONT_FIXED_PITCH (1 << 0)
#define FXFONT_SERIF (1 << 1)
#define FXFONT_SYMBOLIC (1 << 2)
#define FXFONT_SCRIPT (1 << 3)
#define FXFONT_NONSYMBOLIC (1 << 5)
#define FXFONT_ITALIC (1 << 6)
#define FXFONT_ALLCAP (1 << 16)
#define FXFONT_SMALLCAP (1 << 17)
#define FXFONT_FORCE_BOLD (1 << 18)
 
/* Other font flags */
#define FXFONT_USEEXTERNATTR 0x80000
 
// These numbers come from the OpenType name table specification.
constexpr uint16_t kNamePlatformAppleUnicode = 0;
constexpr uint16_t kNamePlatformMac = 1;
constexpr uint16_t kNamePlatformWindows = 3;
 
#if defined(PDF_USE_SKIA)
class SkTypeface;
 
using CFX_TypeFace = SkTypeface;
#endif
 
class TextGlyphPos;
 
FX_RECT GetGlyphsBBox(const std::vector<TextGlyphPos>& glyphs, int anti_alias);
 
ByteString GetNameFromTT(pdfium::span<const uint8_t> name_table, uint32_t name);
size_t GetTTCIndex(pdfium::span<const uint8_t> pFontData, size_t font_offset);
 
inline bool FontStyleIsForceBold(uint32_t style) {
  return !!(style & FXFONT_FORCE_BOLD);
}
inline bool FontStyleIsItalic(uint32_t style) {
  return !!(style & FXFONT_ITALIC);
}
inline bool FontStyleIsFixedPitch(uint32_t style) {
  return !!(style & FXFONT_FIXED_PITCH);
}
inline bool FontStyleIsSymbolic(uint32_t style) {
  return !!(style & FXFONT_SYMBOLIC);
}
inline bool FontStyleIsNonSymbolic(uint32_t style) {
  return !!(style & FXFONT_NONSYMBOLIC);
}
inline bool FontStyleIsAllCaps(uint32_t style) {
  return !!(style & FXFONT_ALLCAP);
}
inline bool FontStyleIsSerif(uint32_t style) {
  return !!(style & FXFONT_SERIF);
}
inline bool FontStyleIsScript(uint32_t style) {
  return !!(style & FXFONT_SCRIPT);
}
 
inline bool FontFamilyIsFixedPitch(uint32_t family) {
  return !!(family & FXFONT_FF_FIXEDPITCH);
}
inline bool FontFamilyIsRoman(uint32_t family) {
  return !!(family & FXFONT_FF_ROMAN);
}
inline bool FontFamilyIsScript(int32_t family) {
  return !!(family & FXFONT_FF_SCRIPT);
}
 
wchar_t UnicodeFromAdobeName(const char* name);
ByteString AdobeNameFromUnicode(wchar_t unicode);
 
// Take a font metric `value` and scale it down by the font's `upem`. If the
// font is not scalable, i.e. `upem` is 0, then return `value` as is.
// If the computed result is excessively large and does not fit in an int,
// NormalizeFontMetric() handles that with `saturated_cast()`.
int NormalizeFontMetric(int64_t value, uint16_t upem);
 
#endif  // CORE_FXGE_FX_FONT_H_