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// Copyright 2019 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/fxge/cfx_face.h"
#include <algorithm>
#include <limits>
#include <memory>
#include <utility>
#include <vector>
#include "core/fxge/cfx_font.h"
#include "core/fxge/cfx_fontmgr.h"
#include "core/fxge/cfx_gemodule.h"
#include "core/fxge/cfx_glyphbitmap.h"
#include "core/fxge/cfx_path.h"
#include "core/fxge/cfx_substfont.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "core/fxge/dib/fx_dib.h"
#include "core/fxge/fx_font.h"
#include "core/fxge/fx_fontencoding.h"
#include "core/fxge/scoped_font_transform.h"
#include "third_party/base/check.h"
#include "third_party/base/check_op.h"
#include "third_party/base/notreached.h"
#include "third_party/base/numerics/clamped_math.h"
#include "third_party/base/numerics/safe_conversions.h"
#include "third_party/base/numerics/safe_math.h"
#define EM_ADJUST(em, a) (em == 0 ? (a) : (a) * 1000 / em)
namespace {
struct OUTLINE_PARAMS {
UnownedPtr<CFX_Path> m_pPath;
FT_Pos m_CurX;
FT_Pos m_CurY;
float m_CoordUnit;
};
constexpr int kThousandthMinInt = std::numeric_limits<int>::min() / 1000;
constexpr int kThousandthMaxInt = std::numeric_limits<int>::max() / 1000;
constexpr int kMaxGlyphDimension = 2048;
// Boundary value to avoid integer overflow when adding 1/64th of the value.
constexpr int kMaxRectTop = 2114445437;
constexpr uint8_t kWeightPow[] = {
0, 6, 12, 14, 16, 18, 22, 24, 28, 30, 32, 34, 36, 38, 40,
42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70,
70, 72, 72, 74, 74, 74, 76, 76, 76, 78, 78, 78, 80, 80, 80,
82, 82, 82, 84, 84, 84, 84, 86, 86, 86, 88, 88, 88, 88, 90,
90, 90, 90, 92, 92, 92, 92, 94, 94, 94, 94, 96, 96, 96, 96,
96, 98, 98, 98, 98, 100, 100, 100, 100, 100, 102, 102, 102, 102, 102,
104, 104, 104, 104, 104, 106, 106, 106, 106, 106,
};
constexpr uint8_t kWeightPow11[] = {
0, 4, 7, 8, 9, 10, 12, 13, 15, 17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 39, 39, 40, 40, 41,
41, 41, 42, 42, 42, 43, 43, 43, 44, 44, 44, 45, 45, 45, 46, 46, 46,
46, 43, 47, 47, 48, 48, 48, 48, 45, 50, 50, 50, 46, 51, 51, 51, 52,
52, 52, 52, 53, 53, 53, 53, 53, 54, 54, 54, 54, 55, 55, 55, 55, 55,
56, 56, 56, 56, 56, 57, 57, 57, 57, 57, 58, 58, 58, 58, 58,
};
constexpr uint8_t kWeightPowShiftJis[] = {
0, 0, 2, 4, 6, 8, 10, 14, 16, 20, 22, 26, 28, 32, 34,
38, 42, 44, 48, 52, 56, 60, 64, 66, 70, 74, 78, 82, 86, 90,
96, 96, 96, 96, 98, 98, 98, 100, 100, 100, 100, 102, 102, 102, 102,
104, 104, 104, 104, 104, 106, 106, 106, 106, 106, 108, 108, 108, 108, 108,
110, 110, 110, 110, 110, 112, 112, 112, 112, 112, 112, 114, 114, 114, 114,
114, 114, 114, 116, 116, 116, 116, 116, 116, 116, 118, 118, 118, 118, 118,
118, 118, 120, 120, 120, 120, 120, 120, 120, 120,
};
constexpr size_t kWeightPowArraySize = 100;
static_assert(kWeightPowArraySize == std::size(kWeightPow), "Wrong size");
static_assert(kWeightPowArraySize == std::size(kWeightPow11), "Wrong size");
static_assert(kWeightPowArraySize == std::size(kWeightPowShiftJis),
"Wrong size");
// Returns negative values on failure.
int GetWeightLevel(FX_Charset charset, size_t index) {
if (index >= kWeightPowArraySize) {
return -1;
}
if (charset == FX_Charset::kShiftJIS) {
return kWeightPowShiftJis[index];
}
return kWeightPow11[index];
}
int GetSkewFromAngle(int angle) {
static constexpr int8_t kAngleSkew[] = {
-0, -2, -3, -5, -7, -9, -11, -12, -14, -16, -18, -19, -21, -23, -25,
-27, -29, -31, -32, -34, -36, -38, -40, -42, -45, -47, -49, -51, -53, -55,
};
// |angle| is non-positive so |-angle| is used as the index. Need to make sure
// |angle| != INT_MIN since -INT_MIN is undefined.
if (angle > 0 || angle == std::numeric_limits<int>::min() ||
static_cast<size_t>(-angle) >= std::size(kAngleSkew)) {
return -58;
}
return kAngleSkew[-angle];
}
int FTPosToCBoxInt(FT_Pos pos) {
// Boundary values to avoid integer overflow when multiplied by 1000.
constexpr FT_Pos kMinCBox = -2147483;
constexpr FT_Pos kMaxCBox = 2147483;
return static_cast<int>(std::clamp(pos, kMinCBox, kMaxCBox));
}
void Outline_CheckEmptyContour(OUTLINE_PARAMS* param) {
size_t size;
{
pdfium::span<const CFX_Path::Point> points = param->m_pPath->GetPoints();
size = points.size();
if (size >= 2 &&
points[size - 2].IsTypeAndOpen(CFX_Path::Point::Type::kMove) &&
points[size - 2].m_Point == points[size - 1].m_Point) {
size -= 2;
}
if (size >= 4 &&
points[size - 4].IsTypeAndOpen(CFX_Path::Point::Type::kMove) &&
points[size - 3].IsTypeAndOpen(CFX_Path::Point::Type::kBezier) &&
points[size - 3].m_Point == points[size - 4].m_Point &&
points[size - 2].m_Point == points[size - 4].m_Point &&
points[size - 1].m_Point == points[size - 4].m_Point) {
size -= 4;
}
}
// Only safe after |points| has been destroyed.
param->m_pPath->GetPoints().resize(size);
}
int Outline_MoveTo(const FT_Vector* to, void* user) {
OUTLINE_PARAMS* param = static_cast<OUTLINE_PARAMS*>(user);
Outline_CheckEmptyContour(param);
param->m_pPath->ClosePath();
param->m_pPath->AppendPoint(
CFX_PointF(to->x / param->m_CoordUnit, to->y / param->m_CoordUnit),
CFX_Path::Point::Type::kMove);
param->m_CurX = to->x;
param->m_CurY = to->y;
return 0;
}
int Outline_LineTo(const FT_Vector* to, void* user) {
OUTLINE_PARAMS* param = static_cast<OUTLINE_PARAMS*>(user);
param->m_pPath->AppendPoint(
CFX_PointF(to->x / param->m_CoordUnit, to->y / param->m_CoordUnit),
CFX_Path::Point::Type::kLine);
param->m_CurX = to->x;
param->m_CurY = to->y;
return 0;
}
int Outline_ConicTo(const FT_Vector* control, const FT_Vector* to, void* user) {
OUTLINE_PARAMS* param = static_cast<OUTLINE_PARAMS*>(user);
param->m_pPath->AppendPoint(
CFX_PointF((param->m_CurX + (control->x - param->m_CurX) * 2 / 3) /
param->m_CoordUnit,
(param->m_CurY + (control->y - param->m_CurY) * 2 / 3) /
param->m_CoordUnit),
CFX_Path::Point::Type::kBezier);
param->m_pPath->AppendPoint(
CFX_PointF((control->x + (to->x - control->x) / 3) / param->m_CoordUnit,
(control->y + (to->y - control->y) / 3) / param->m_CoordUnit),
CFX_Path::Point::Type::kBezier);
param->m_pPath->AppendPoint(
CFX_PointF(to->x / param->m_CoordUnit, to->y / param->m_CoordUnit),
CFX_Path::Point::Type::kBezier);
param->m_CurX = to->x;
param->m_CurY = to->y;
return 0;
}
int Outline_CubicTo(const FT_Vector* control1,
const FT_Vector* control2,
const FT_Vector* to,
void* user) {
OUTLINE_PARAMS* param = static_cast<OUTLINE_PARAMS*>(user);
param->m_pPath->AppendPoint(CFX_PointF(control1->x / param->m_CoordUnit,
control1->y / param->m_CoordUnit),
CFX_Path::Point::Type::kBezier);
param->m_pPath->AppendPoint(CFX_PointF(control2->x / param->m_CoordUnit,
control2->y / param->m_CoordUnit),
CFX_Path::Point::Type::kBezier);
param->m_pPath->AppendPoint(
CFX_PointF(to->x / param->m_CoordUnit, to->y / param->m_CoordUnit),
CFX_Path::Point::Type::kBezier);
param->m_CurX = to->x;
param->m_CurY = to->y;
return 0;
}
FT_Encoding ToFTEncoding(fxge::FontEncoding encoding) {
switch (encoding) {
case fxge::FontEncoding::kAdobeCustom:
return FT_ENCODING_ADOBE_CUSTOM;
case fxge::FontEncoding::kAdobeExpert:
return FT_ENCODING_ADOBE_EXPERT;
case fxge::FontEncoding::kAdobeStandard:
return FT_ENCODING_ADOBE_STANDARD;
case fxge::FontEncoding::kAppleRoman:
return FT_ENCODING_APPLE_ROMAN;
case fxge::FontEncoding::kBig5:
return FT_ENCODING_BIG5;
case fxge::FontEncoding::kGB2312:
return FT_ENCODING_PRC;
case fxge::FontEncoding::kJohab:
return FT_ENCODING_JOHAB;
case fxge::FontEncoding::kLatin1:
return FT_ENCODING_ADOBE_LATIN_1;
case fxge::FontEncoding::kNone:
return FT_ENCODING_NONE;
case fxge::FontEncoding::kOldLatin2:
return FT_ENCODING_OLD_LATIN_2;
case fxge::FontEncoding::kSjis:
return FT_ENCODING_SJIS;
case fxge::FontEncoding::kSymbol:
return FT_ENCODING_MS_SYMBOL;
case fxge::FontEncoding::kUnicode:
return FT_ENCODING_UNICODE;
case fxge::FontEncoding::kWansung:
return FT_ENCODING_WANSUNG;
}
}
fxge::FontEncoding ToFontEncoding(uint32_t ft_encoding) {
switch (ft_encoding) {
case FT_ENCODING_ADOBE_CUSTOM:
return fxge::FontEncoding::kAdobeCustom;
case FT_ENCODING_ADOBE_EXPERT:
return fxge::FontEncoding::kAdobeExpert;
case FT_ENCODING_ADOBE_STANDARD:
return fxge::FontEncoding::kAdobeStandard;
case FT_ENCODING_APPLE_ROMAN:
return fxge::FontEncoding::kAppleRoman;
case FT_ENCODING_BIG5:
return fxge::FontEncoding::kBig5;
case FT_ENCODING_PRC:
return fxge::FontEncoding::kGB2312;
case FT_ENCODING_JOHAB:
return fxge::FontEncoding::kJohab;
case FT_ENCODING_ADOBE_LATIN_1:
return fxge::FontEncoding::kLatin1;
case FT_ENCODING_NONE:
return fxge::FontEncoding::kNone;
case FT_ENCODING_OLD_LATIN_2:
return fxge::FontEncoding::kOldLatin2;
case FT_ENCODING_SJIS:
return fxge::FontEncoding::kSjis;
case FT_ENCODING_MS_SYMBOL:
return fxge::FontEncoding::kSymbol;
case FT_ENCODING_UNICODE:
return fxge::FontEncoding::kUnicode;
case FT_ENCODING_WANSUNG:
return fxge::FontEncoding::kWansung;
}
NOTREACHED_NORETURN();
}
} // namespace
// static
RetainPtr<CFX_Face> CFX_Face::New(FT_Library library,
RetainPtr<Retainable> pDesc,
pdfium::span<const FT_Byte> data,
FT_Long face_index) {
FXFT_FaceRec* pRec = nullptr;
if (FT_New_Memory_Face(library, data.data(),
pdfium::base::checked_cast<FT_Long>(data.size()),
face_index, &pRec) != 0) {
return nullptr;
}
// Private ctor.
return pdfium::WrapRetain(new CFX_Face(pRec, std::move(pDesc)));
}
// static
RetainPtr<CFX_Face> CFX_Face::Open(FT_Library library,
const FT_Open_Args* args,
FT_Long face_index) {
FXFT_FaceRec* pRec = nullptr;
if (FT_Open_Face(library, args, face_index, &pRec) != 0)
return nullptr;
// Private ctor.
return pdfium::WrapRetain(new CFX_Face(pRec, nullptr));
}
bool CFX_Face::HasGlyphNames() const {
return !!(GetRec()->face_flags & FT_FACE_FLAG_GLYPH_NAMES);
}
bool CFX_Face::IsTtOt() const {
return !!(GetRec()->face_flags & FT_FACE_FLAG_SFNT);
}
bool CFX_Face::IsTricky() const {
return !!(GetRec()->face_flags & FT_FACE_FLAG_TRICKY);
}
bool CFX_Face::IsFixedWidth() const {
return !!(GetRec()->face_flags & FT_FACE_FLAG_FIXED_WIDTH);
}
#if defined(PDF_ENABLE_XFA)
bool CFX_Face::IsScalable() const {
return !!(GetRec()->face_flags & FT_FACE_FLAG_SCALABLE);
}
void CFX_Face::ClearExternalStream() {
GetRec()->face_flags &= ~FT_FACE_FLAG_EXTERNAL_STREAM;
}
#endif
bool CFX_Face::IsItalic() const {
return !!(GetRec()->style_flags & FT_STYLE_FLAG_ITALIC);
}
bool CFX_Face::IsBold() const {
return !!(GetRec()->style_flags & FT_STYLE_FLAG_BOLD);
}
ByteString CFX_Face::GetFamilyName() const {
return ByteString(GetRec()->family_name);
}
ByteString CFX_Face::GetStyleName() const {
return ByteString(GetRec()->style_name);
}
FX_RECT CFX_Face::GetBBox() const {
return FX_RECT(pdfium::base::checked_cast<int32_t>(GetRec()->bbox.xMin),
pdfium::base::checked_cast<int32_t>(GetRec()->bbox.yMin),
pdfium::base::checked_cast<int32_t>(GetRec()->bbox.xMax),
pdfium::base::checked_cast<int32_t>(GetRec()->bbox.yMax));
}
uint16_t CFX_Face::GetUnitsPerEm() const {
return pdfium::base::checked_cast<uint16_t>(GetRec()->units_per_EM);
}
int16_t CFX_Face::GetAscender() const {
return pdfium::base::checked_cast<int16_t>(GetRec()->ascender);
}
int16_t CFX_Face::GetDescender() const {
return pdfium::base::checked_cast<int16_t>(GetRec()->descender);
}
#if BUILDFLAG(IS_ANDROID)
int16_t CFX_Face::GetHeight() const {
return pdfium::base::checked_cast<int16_t>(GetRec()->height);
}
#endif
pdfium::span<uint8_t> CFX_Face::GetData() const {
return {GetRec()->stream->base, GetRec()->stream->size};
}
size_t CFX_Face::GetSfntTable(uint32_t table, pdfium::span<uint8_t> buffer) {
unsigned long length =
pdfium::base::checked_cast<unsigned long>(buffer.size());
if (length) {
int error = FT_Load_Sfnt_Table(GetRec(), table, 0, buffer.data(), &length);
if (error || length != buffer.size()) {
return 0;
}
return buffer.size();
}
int error = FT_Load_Sfnt_Table(GetRec(), table, 0, nullptr, &length);
if (error || !length) {
return 0;
}
return pdfium::base::checked_cast<size_t>(length);
}
std::optional<std::array<uint32_t, 4>> CFX_Face::GetOs2UnicodeRange() {
auto* os2 = static_cast<TT_OS2*>(FT_Get_Sfnt_Table(GetRec(), FT_SFNT_OS2));
if (!os2) {
return std::nullopt;
}
return std::array<uint32_t, 4>{static_cast<uint32_t>(os2->ulUnicodeRange1),
static_cast<uint32_t>(os2->ulUnicodeRange2),
static_cast<uint32_t>(os2->ulUnicodeRange3),
static_cast<uint32_t>(os2->ulUnicodeRange4)};
}
std::optional<std::array<uint32_t, 2>> CFX_Face::GetOs2CodePageRange() {
auto* os2 = static_cast<TT_OS2*>(FT_Get_Sfnt_Table(GetRec(), FT_SFNT_OS2));
if (!os2) {
return std::nullopt;
}
return std::array<uint32_t, 2>{static_cast<uint32_t>(os2->ulCodePageRange1),
static_cast<uint32_t>(os2->ulCodePageRange2)};
}
std::optional<std::array<uint8_t, 2>> CFX_Face::GetOs2Panose() {
auto* os2 = static_cast<TT_OS2*>(FT_Get_Sfnt_Table(GetRec(), FT_SFNT_OS2));
if (!os2) {
return std::nullopt;
}
return std::array<uint8_t, 2>{os2->panose[0], os2->panose[1]};
}
int CFX_Face::GetGlyphCount() const {
return pdfium::base::checked_cast<int>(GetRec()->num_glyphs);
}
std::unique_ptr<CFX_GlyphBitmap> CFX_Face::RenderGlyph(const CFX_Font* pFont,
uint32_t glyph_index,
bool bFontStyle,
const CFX_Matrix& matrix,
int dest_width,
int anti_alias) {
FT_Matrix ft_matrix;
ft_matrix.xx = matrix.a / 64 * 65536;
ft_matrix.xy = matrix.c / 64 * 65536;
ft_matrix.yx = matrix.b / 64 * 65536;
ft_matrix.yy = matrix.d / 64 * 65536;
bool bUseCJKSubFont = false;
const CFX_SubstFont* pSubstFont = pFont->GetSubstFont();
if (pSubstFont) {
bUseCJKSubFont = pSubstFont->m_bSubstCJK && bFontStyle;
int angle;
if (bUseCJKSubFont) {
angle = pSubstFont->m_bItalicCJK ? -15 : 0;
} else {
angle = pSubstFont->m_ItalicAngle;
}
if (angle) {
int skew = GetSkewFromAngle(angle);
if (pFont->IsVertical()) {
ft_matrix.yx += ft_matrix.yy * skew / 100;
} else {
ft_matrix.xy -= ft_matrix.xx * skew / 100;
}
}
if (pSubstFont->IsBuiltInGenericFont()) {
pFont->GetFace()->AdjustVariationParams(glyph_index, dest_width,
pFont->GetSubstFont()->m_Weight);
}
}
ScopedFontTransform scoped_transform(pdfium::WrapRetain(this), &ft_matrix);
int load_flags = FT_LOAD_NO_BITMAP | FT_LOAD_PEDANTIC;
if (!IsTtOt()) {
load_flags |= FT_LOAD_NO_HINTING;
}
FXFT_FaceRec* rec = GetRec();
int error = FT_Load_Glyph(rec, glyph_index, load_flags);
if (error) {
// if an error is returned, try to reload glyphs without hinting.
if (load_flags & FT_LOAD_NO_HINTING) {
return nullptr;
}
load_flags |= FT_LOAD_NO_HINTING;
load_flags &= ~FT_LOAD_PEDANTIC;
error = FT_Load_Glyph(rec, glyph_index, load_flags);
if (error) {
return nullptr;
}
}
auto* glyph = rec->glyph;
int weight;
if (bUseCJKSubFont) {
weight = pSubstFont->m_WeightCJK;
} else {
weight = pSubstFont ? pSubstFont->m_Weight : 0;
}
if (pSubstFont && !pSubstFont->IsBuiltInGenericFont() && weight > 400) {
uint32_t index = (weight - 400) / 10;
pdfium::base::CheckedNumeric<signed long> level =
GetWeightLevel(pSubstFont->m_Charset, index);
if (level.ValueOrDefault(-1) < 0) {
return nullptr;
}
level = level *
(abs(static_cast<int>(ft_matrix.xx)) +
abs(static_cast<int>(ft_matrix.xy))) /
36655;
FT_Outline_Embolden(&glyph->outline, level.ValueOrDefault(0));
}
FT_Library_SetLcdFilter(CFX_GEModule::Get()->GetFontMgr()->GetFTLibrary(),
FT_LCD_FILTER_DEFAULT);
error = FT_Render_Glyph(glyph, static_cast<FT_Render_Mode>(anti_alias));
if (error) {
return nullptr;
}
const FT_Bitmap& bitmap = glyph->bitmap;
if (bitmap.width > kMaxGlyphDimension || bitmap.rows > kMaxGlyphDimension) {
return nullptr;
}
int dib_width = bitmap.width;
auto pGlyphBitmap =
std::make_unique<CFX_GlyphBitmap>(glyph->bitmap_left, glyph->bitmap_top);
pGlyphBitmap->GetBitmap()->Create(dib_width, bitmap.rows,
anti_alias == FT_RENDER_MODE_MONO
? FXDIB_Format::k1bppMask
: FXDIB_Format::k8bppMask);
int dest_pitch = pGlyphBitmap->GetBitmap()->GetPitch();
uint8_t* pDestBuf = pGlyphBitmap->GetBitmap()->GetWritableBuffer().data();
const uint8_t* pSrcBuf = bitmap.buffer;
if (anti_alias != FT_RENDER_MODE_MONO &&
bitmap.pixel_mode == FT_PIXEL_MODE_MONO) {
unsigned int bytes = anti_alias == FT_RENDER_MODE_LCD ? 3 : 1;
for (unsigned int i = 0; i < bitmap.rows; i++) {
for (unsigned int n = 0; n < bitmap.width; n++) {
uint8_t data =
(pSrcBuf[i * bitmap.pitch + n / 8] & (0x80 >> (n % 8))) ? 255 : 0;
for (unsigned int b = 0; b < bytes; b++) {
pDestBuf[i * dest_pitch + n * bytes + b] = data;
}
}
}
} else {
FXSYS_memset(pDestBuf, 0, dest_pitch * bitmap.rows);
int rowbytes = std::min(abs(bitmap.pitch), dest_pitch);
for (unsigned int row = 0; row < bitmap.rows; row++) {
FXSYS_memcpy(pDestBuf + row * dest_pitch, pSrcBuf + row * bitmap.pitch,
rowbytes);
}
}
return pGlyphBitmap;
}
std::unique_ptr<CFX_Path> CFX_Face::LoadGlyphPath(
uint32_t glyph_index,
int dest_width,
bool is_vertical,
const CFX_SubstFont* subst_font) {
FXFT_FaceRec* rec = GetRec();
FT_Set_Pixel_Sizes(rec, 0, 64);
FT_Matrix ft_matrix = {65536, 0, 0, 65536};
if (subst_font) {
if (subst_font->m_ItalicAngle) {
int skew = GetSkewFromAngle(subst_font->m_ItalicAngle);
if (is_vertical) {
ft_matrix.yx += ft_matrix.yy * skew / 100;
} else {
ft_matrix.xy -= ft_matrix.xx * skew / 100;
}
}
if (subst_font->IsBuiltInGenericFont()) {
AdjustVariationParams(glyph_index, dest_width, subst_font->m_Weight);
}
}
ScopedFontTransform scoped_transform(pdfium::WrapRetain(this), &ft_matrix);
int load_flags = FT_LOAD_NO_BITMAP;
if (!IsTtOt() || !IsTricky()) {
load_flags |= FT_LOAD_NO_HINTING;
}
if (FT_Load_Glyph(rec, glyph_index, load_flags)) {
return nullptr;
}
if (subst_font && !subst_font->IsBuiltInGenericFont() &&
subst_font->m_Weight > 400) {
uint32_t index = std::min<uint32_t>((subst_font->m_Weight - 400) / 10,
kWeightPowArraySize - 1);
int level;
if (subst_font->m_Charset == FX_Charset::kShiftJIS) {
level = kWeightPowShiftJis[index] * 65536 / 36655;
} else {
level = kWeightPow[index];
}
FT_Outline_Embolden(&rec->glyph->outline, level);
}
FT_Outline_Funcs funcs;
funcs.move_to = Outline_MoveTo;
funcs.line_to = Outline_LineTo;
funcs.conic_to = Outline_ConicTo;
funcs.cubic_to = Outline_CubicTo;
funcs.shift = 0;
funcs.delta = 0;
auto pPath = std::make_unique<CFX_Path>();
OUTLINE_PARAMS params;
params.m_pPath = pPath.get();
params.m_CurX = params.m_CurY = 0;
params.m_CoordUnit = 64 * 64.0;
FT_Outline_Decompose(&rec->glyph->outline, &funcs, &params);
if (pPath->GetPoints().empty()) {
return nullptr;
}
Outline_CheckEmptyContour(&params);
pPath->ClosePath();
return pPath;
}
int CFX_Face::GetGlyphWidth(uint32_t glyph_index,
int dest_width,
int weight,
const CFX_SubstFont* subst_font) {
if (subst_font && subst_font->IsBuiltInGenericFont()) {
AdjustVariationParams(glyph_index, dest_width, weight);
}
FXFT_FaceRec* rec = GetRec();
int err = FT_Load_Glyph(
rec, glyph_index, FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
if (err) {
return 0;
}
FT_Pos horizontal_advance = rec->glyph->metrics.horiAdvance;
if (horizontal_advance < kThousandthMinInt ||
horizontal_advance > kThousandthMaxInt) {
return 0;
}
return static_cast<int>(EM_ADJUST(GetUnitsPerEm(), horizontal_advance));
}
ByteString CFX_Face::GetGlyphName(uint32_t glyph_index) {
char name[256] = {};
FT_Get_Glyph_Name(GetRec(), glyph_index, name, sizeof(name));
name[255] = 0;
return ByteString(name);
}
int CFX_Face::GetCharIndex(uint32_t code) {
return FT_Get_Char_Index(GetRec(), code);
}
int CFX_Face::GetNameIndex(const char* name) {
return FT_Get_Name_Index(GetRec(), name);
}
FX_RECT CFX_Face::GetCharBBox(uint32_t code, int glyph_index) {
FX_RECT rect;
FXFT_FaceRec* rec = GetRec();
if (IsTricky()) {
int err =
FT_Load_Glyph(rec, glyph_index, FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
if (!err) {
FT_Glyph glyph;
err = FT_Get_Glyph(rec->glyph, &glyph);
if (!err) {
FT_BBox cbox;
FT_Glyph_Get_CBox(glyph, FT_GLYPH_BBOX_PIXELS, &cbox);
const int xMin = FTPosToCBoxInt(cbox.xMin);
const int xMax = FTPosToCBoxInt(cbox.xMax);
const int yMin = FTPosToCBoxInt(cbox.yMin);
const int yMax = FTPosToCBoxInt(cbox.yMax);
const int pixel_size_x = rec->size->metrics.x_ppem;
const int pixel_size_y = rec->size->metrics.y_ppem;
if (pixel_size_x == 0 || pixel_size_y == 0) {
rect = FX_RECT(xMin, yMax, xMax, yMin);
} else {
rect =
FX_RECT(xMin * 1000 / pixel_size_x, yMax * 1000 / pixel_size_y,
xMax * 1000 / pixel_size_x, yMin * 1000 / pixel_size_y);
}
rect.top = std::min(rect.top, static_cast<int>(GetAscender()));
rect.bottom = std::max(rect.bottom, static_cast<int>(GetDescender()));
FT_Done_Glyph(glyph);
}
}
} else {
int err = FT_Load_Glyph(rec, glyph_index, FT_LOAD_NO_SCALE);
if (err == 0) {
rect = GetGlyphBBox();
if (rect.top <= kMaxRectTop) {
rect.top += rect.top / 64;
} else {
rect.top = std::numeric_limits<int>::max();
}
}
}
return rect;
}
FX_RECT CFX_Face::GetGlyphBBox() const {
const auto* glyph = GetRec()->glyph;
pdfium::base::ClampedNumeric<FT_Pos> left = glyph->metrics.horiBearingX;
pdfium::base::ClampedNumeric<FT_Pos> top = glyph->metrics.horiBearingY;
const uint16_t upem = GetUnitsPerEm();
return FX_RECT(NormalizeFontMetric(left, upem),
NormalizeFontMetric(top, upem),
NormalizeFontMetric(left + glyph->metrics.width, upem),
NormalizeFontMetric(top - glyph->metrics.height, upem));
}
std::vector<CFX_Face::CharCodeAndIndex> CFX_Face::GetCharCodesAndIndices(
char32_t max_char) {
CharCodeAndIndex char_code_and_index;
char_code_and_index.char_code = static_cast<uint32_t>(
FT_Get_First_Char(GetRec(), &char_code_and_index.glyph_index));
if (char_code_and_index.char_code > max_char) {
return {};
}
std::vector<CharCodeAndIndex> results = {char_code_and_index};
while (true) {
char_code_and_index.char_code = static_cast<uint32_t>(FT_Get_Next_Char(
GetRec(), results.back().char_code, &char_code_and_index.glyph_index));
if (char_code_and_index.char_code > max_char ||
char_code_and_index.glyph_index == 0) {
return results;
}
results.push_back(char_code_and_index);
}
}
CFX_Face::CharMap CFX_Face::GetCurrentCharMap() const {
return GetRec()->charmap;
}
std::optional<fxge::FontEncoding> CFX_Face::GetCurrentCharMapEncoding() const {
if (!GetRec()->charmap) {
return std::nullopt;
}
return ToFontEncoding(GetRec()->charmap->encoding);
}
int CFX_Face::GetCharMapPlatformIdByIndex(size_t index) const {
CHECK_LT(index, GetCharMapCount());
return GetRec()->charmaps[index]->platform_id;
}
int CFX_Face::GetCharMapEncodingIdByIndex(size_t index) const {
CHECK_LT(index, GetCharMapCount());
return GetRec()->charmaps[index]->encoding_id;
}
fxge::FontEncoding CFX_Face::GetCharMapEncodingByIndex(size_t index) const {
CHECK_LT(index, GetCharMapCount());
return ToFontEncoding(GetRec()->charmaps[index]->encoding);
}
size_t CFX_Face::GetCharMapCount() const {
return GetRec()->charmaps
? pdfium::base::checked_cast<size_t>(GetRec()->num_charmaps)
: 0;
}
void CFX_Face::SetCharMap(CharMap map) {
FT_Set_Charmap(GetRec(), static_cast<FT_CharMap>(map));
}
void CFX_Face::SetCharMapByIndex(size_t index) {
CHECK_LT(index, GetCharMapCount());
SetCharMap(GetRec()->charmaps[index]);
}
bool CFX_Face::SelectCharMap(fxge::FontEncoding encoding) {
FT_Error error = FT_Select_Charmap(GetRec(), ToFTEncoding(encoding));
return !error;
}
bool CFX_Face::SetPixelSize(uint32_t width, uint32_t height) {
FT_Error error = FT_Set_Pixel_Sizes(GetRec(), width, height);
return !error;
}
#if BUILDFLAG(IS_WIN)
bool CFX_Face::CanEmbed() {
FT_UShort fstype = FT_Get_FSType_Flags(GetRec());
return (fstype & (FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING |
FT_FSTYPE_BITMAP_EMBEDDING_ONLY)) == 0;
}
#endif
CFX_Face::CFX_Face(FXFT_FaceRec* rec, RetainPtr<Retainable> pDesc)
: m_pRec(rec), m_pDesc(std::move(pDesc)) {
DCHECK(m_pRec);
}
CFX_Face::~CFX_Face() = default;
void CFX_Face::AdjustVariationParams(int glyph_index,
int dest_width,
int weight) {
DCHECK(dest_width >= 0);
FXFT_FaceRec* rec = GetRec();
ScopedFXFTMMVar variation_desc(rec);
if (!variation_desc) {
return;
}
FT_Pos coords[2];
if (weight == 0) {
coords[0] = variation_desc.GetAxisDefault(0) / 65536;
} else {
coords[0] = weight;
}
if (dest_width == 0) {
coords[1] = variation_desc.GetAxisDefault(1) / 65536;
} else {
FT_Long min_param = variation_desc.GetAxisMin(1) / 65536;
FT_Long max_param = variation_desc.GetAxisMax(1) / 65536;
coords[1] = min_param;
FT_Set_MM_Design_Coordinates(rec, 2, coords);
FT_Load_Glyph(rec, glyph_index,
FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
FT_Pos min_width = rec->glyph->metrics.horiAdvance * 1000 / GetUnitsPerEm();
coords[1] = max_param;
FT_Set_MM_Design_Coordinates(rec, 2, coords);
FT_Load_Glyph(rec, glyph_index,
FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
FT_Pos max_width = rec->glyph->metrics.horiAdvance * 1000 / GetUnitsPerEm();
if (max_width == min_width) {
return;
}
FT_Pos param = min_param + (max_param - min_param) *
(dest_width - min_width) /
(max_width - min_width);
coords[1] = param;
}
FT_Set_MM_Design_Coordinates(rec, 2, coords);
}