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unplugged-system/external/pdfium/core/fxge/cfx_font.cpp

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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
#include "core/fxge/cfx_font.h"
#include <stdint.h>
#include <algorithm>
#include <limits>
#include <memory>
#include <utility>
#include "build/build_config.h"
#include "core/fxcrt/data_vector.h"
#include "core/fxcrt/fx_codepage.h"
#include "core/fxcrt/fx_stream.h"
#include "core/fxcrt/unowned_ptr.h"
#include "core/fxge/cfx_fontcache.h"
#include "core/fxge/cfx_fontmapper.h"
#include "core/fxge/cfx_fontmgr.h"
#include "core/fxge/cfx_gemodule.h"
#include "core/fxge/cfx_glyphcache.h"
#include "core/fxge/cfx_path.h"
#include "core/fxge/cfx_substfont.h"
#include "core/fxge/fx_font.h"
#include "core/fxge/scoped_font_transform.h"
#include "third_party/base/check.h"
#include "third_party/base/numerics/safe_conversions.h"
#include "third_party/base/span.h"
#define EM_ADJUST(em, a) (em == 0 ? (a) : (a)*1000 / em)
namespace {
constexpr int kThousandthMinInt = std::numeric_limits<int>::min() / 1000;
constexpr int kThousandthMaxInt = std::numeric_limits<int>::max() / 1000;
struct OUTLINE_PARAMS {
UnownedPtr<CFX_Path> m_pPath;
FT_Pos m_CurX;
FT_Pos m_CurY;
float m_CoordUnit;
};
// TODO(crbug.com/pdfium/1400): When FT_Done_MM_Var() is more likely to be
// available to all users in the future, remove FreeMMVar() and use
// FT_Done_MM_Var() directly.
//
// Use weak symbols to check if FT_Done_MM_Var() is available at runtime.
#if !BUILDFLAG(IS_WIN)
extern "C" __attribute__((weak)) decltype(FT_Done_MM_Var) FT_Done_MM_Var;
#endif
void FreeMMVar(FXFT_FaceRec* rec, FXFT_MM_VarPtr variation_desc) {
#if BUILDFLAG(IS_WIN)
// Assume `use_system_freetype` GN var is never set on Windows.
constexpr bool has_ft_done_mm_var_func = true;
#else
static const bool has_ft_done_mm_var_func = !!FT_Done_MM_Var;
#endif
if (has_ft_done_mm_var_func) {
FT_Done_MM_Var(CFX_GEModule::Get()->GetFontMgr()->GetFTLibrary(),
variation_desc);
} else {
FXFT_Free(rec, variation_desc);
}
}
FX_RECT FXRectFromFTPos(FT_Pos left, FT_Pos top, FT_Pos right, FT_Pos bottom) {
return FX_RECT(pdfium::base::checked_cast<int32_t>(left),
pdfium::base::checked_cast<int32_t>(top),
pdfium::base::checked_cast<int32_t>(right),
pdfium::base::checked_cast<int32_t>(bottom));
}
FX_RECT ScaledFXRectFromFTPos(FT_Pos left,
FT_Pos top,
FT_Pos right,
FT_Pos bottom,
int x_scale,
int y_scale) {
if (x_scale == 0 || y_scale == 0)
return FXRectFromFTPos(left, top, right, bottom);
return FXRectFromFTPos(left * 1000 / x_scale, top * 1000 / y_scale,
right * 1000 / x_scale, bottom * 1000 / y_scale);
}
#ifdef PDF_ENABLE_XFA
unsigned long FTStreamRead(FXFT_StreamRec* stream,
unsigned long offset,
unsigned char* buffer,
unsigned long count) {
if (count == 0)
return 0;
IFX_SeekableReadStream* pFile =
static_cast<IFX_SeekableReadStream*>(stream->descriptor.pointer);
return pFile && pFile->ReadBlockAtOffset({buffer, count}, offset) ? count : 0;
}
void FTStreamClose(FXFT_StreamRec* stream) {}
#endif // PDF_ENABLE_XFA
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;
}
bool ShouldAppendStyle(const ByteString& style) {
return !style.IsEmpty() && style != "Regular";
}
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,
};
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");
} // namespace
const CFX_Font::CharsetFontMap CFX_Font::kDefaultTTFMap[] = {
{static_cast<int>(FX_Charset::kANSI), kDefaultAnsiFontName},
{static_cast<int>(FX_Charset::kChineseSimplified), "SimSun"},
{static_cast<int>(FX_Charset::kChineseTraditional), "MingLiU"},
{static_cast<int>(FX_Charset::kShiftJIS), "MS Gothic"},
{static_cast<int>(FX_Charset::kHangul), "Batang"},
{static_cast<int>(FX_Charset::kMSWin_Cyrillic), "Arial"},
#if BUILDFLAG(IS_WIN)
{static_cast<int>(FX_Charset::kMSWin_EasternEuropean), "Tahoma"},
#else
{static_cast<int>(FX_Charset::kMSWin_EasternEuropean), "Arial"},
#endif
{static_cast<int>(FX_Charset::kMSWin_Arabic), "Arial"},
{-1, nullptr}};
// static
const char CFX_Font::kUntitledFontName[] = "Untitled";
// static
const char CFX_Font::kDefaultAnsiFontName[] = "Helvetica";
// static
const char CFX_Font::kUniversalDefaultFontName[] = "Arial Unicode MS";
// static
ByteString CFX_Font::GetDefaultFontNameByCharset(FX_Charset nCharset) {
for (size_t i = 0; i < std::size(kDefaultTTFMap) - 1; ++i) {
if (static_cast<int>(nCharset) == kDefaultTTFMap[i].charset)
return kDefaultTTFMap[i].fontname;
}
return kUniversalDefaultFontName;
}
// static
FX_Charset CFX_Font::GetCharSetFromUnicode(uint16_t word) {
// to avoid CJK Font to show ASCII
if (word < 0x7F)
return FX_Charset::kANSI;
// find new charset
if ((word >= 0x4E00 && word <= 0x9FA5) ||
(word >= 0xE7C7 && word <= 0xE7F3) ||
(word >= 0x3000 && word <= 0x303F) ||
(word >= 0x2000 && word <= 0x206F)) {
return FX_Charset::kChineseSimplified;
}
if (((word >= 0x3040) && (word <= 0x309F)) ||
((word >= 0x30A0) && (word <= 0x30FF)) ||
((word >= 0x31F0) && (word <= 0x31FF)) ||
((word >= 0xFF00) && (word <= 0xFFEF))) {
return FX_Charset::kShiftJIS;
}
if (((word >= 0xAC00) && (word <= 0xD7AF)) ||
((word >= 0x1100) && (word <= 0x11FF)) ||
((word >= 0x3130) && (word <= 0x318F))) {
return FX_Charset::kHangul;
}
if (word >= 0x0E00 && word <= 0x0E7F)
return FX_Charset::kThai;
if ((word >= 0x0370 && word <= 0x03FF) || (word >= 0x1F00 && word <= 0x1FFF))
return FX_Charset::kMSWin_Greek;
if ((word >= 0x0600 && word <= 0x06FF) || (word >= 0xFB50 && word <= 0xFEFC))
return FX_Charset::kMSWin_Arabic;
if (word >= 0x0590 && word <= 0x05FF)
return FX_Charset::kMSWin_Hebrew;
if (word >= 0x0400 && word <= 0x04FF)
return FX_Charset::kMSWin_Cyrillic;
if (word >= 0x0100 && word <= 0x024F)
return FX_Charset::kMSWin_EasternEuropean;
if (word >= 0x1E00 && word <= 0x1EFF)
return FX_Charset::kMSWin_Vietnamese;
return FX_Charset::kANSI;
}
CFX_Font::CFX_Font() = default;
int CFX_Font::GetSubstFontItalicAngle() const {
CFX_SubstFont* subst_font = GetSubstFont();
return subst_font ? subst_font->m_ItalicAngle : 0;
}
#ifdef PDF_ENABLE_XFA
bool CFX_Font::LoadFile(RetainPtr<IFX_SeekableReadStream> pFile,
int nFaceIndex) {
m_bEmbedded = false;
m_ObjectTag = 0;
auto pStreamRec = std::make_unique<FXFT_StreamRec>();
pStreamRec->base = nullptr;
pStreamRec->size = static_cast<unsigned long>(pFile->GetSize());
pStreamRec->pos = 0;
pStreamRec->descriptor.pointer = static_cast<void*>(pFile.Get());
pStreamRec->close = FTStreamClose;
pStreamRec->read = FTStreamRead;
FT_Open_Args args;
args.flags = FT_OPEN_STREAM;
args.stream = pStreamRec.get();
m_Face = CFX_Face::Open(CFX_GEModule::Get()->GetFontMgr()->GetFTLibrary(),
&args, nFaceIndex);
if (!m_Face)
return false;
m_pOwnedFile = std::move(pFile);
m_pOwnedStreamRec = std::move(pStreamRec);
FT_Set_Pixel_Sizes(m_Face->GetRec(), 0, 64);
return true;
}
#if !BUILDFLAG(IS_WIN)
void CFX_Font::SetFace(RetainPtr<CFX_Face> face) {
ClearGlyphCache();
m_ObjectTag = 0;
m_Face = face;
}
void CFX_Font::SetSubstFont(std::unique_ptr<CFX_SubstFont> subst) {
m_pSubstFont = std::move(subst);
}
#endif // !BUILDFLAG(IS_WIN)
#endif // PDF_ENABLE_XFA
CFX_Font::~CFX_Font() {
m_FontData = {}; // m_FontData can't outive m_Face.
m_Face.Reset();
#if BUILDFLAG(IS_APPLE)
ReleasePlatformResource();
#endif
}
void CFX_Font::LoadSubst(const ByteString& face_name,
bool bTrueType,
uint32_t flags,
int weight,
int italic_angle,
FX_CodePage code_page,
bool bVertical) {
m_bEmbedded = false;
m_bVertical = bVertical;
m_ObjectTag = 0;
m_pSubstFont = std::make_unique<CFX_SubstFont>();
m_Face = CFX_GEModule::Get()->GetFontMgr()->GetBuiltinMapper()->FindSubstFont(
face_name, bTrueType, flags, weight, italic_angle, code_page,
m_pSubstFont.get());
if (m_Face) {
m_FontData = {FXFT_Get_Face_Stream_Base(m_Face->GetRec()),
FXFT_Get_Face_Stream_Size(m_Face->GetRec())};
}
}
int CFX_Font::GetGlyphWidth(uint32_t glyph_index) const {
return GetGlyphWidth(glyph_index, 0, 0);
}
int CFX_Font::GetGlyphWidth(uint32_t glyph_index,
int dest_width,
int weight) const {
return GetOrCreateGlyphCache()->GetGlyphWidth(this, glyph_index, dest_width,
weight);
}
int CFX_Font::GetGlyphWidthImpl(uint32_t glyph_index,
int dest_width,
int weight) const {
if (!m_Face)
return 0;
if (m_pSubstFont && m_pSubstFont->IsBuiltInGenericFont())
AdjustMMParams(glyph_index, dest_width, weight);
int err =
FT_Load_Glyph(m_Face->GetRec(), glyph_index,
FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
if (err)
return 0;
FT_Pos horiAdvance = FXFT_Get_Glyph_HoriAdvance(m_Face->GetRec());
if (horiAdvance < kThousandthMinInt || horiAdvance > kThousandthMaxInt)
return 0;
return static_cast<int>(
EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face->GetRec()), horiAdvance));
}
bool CFX_Font::LoadEmbedded(pdfium::span<const uint8_t> src_span,
bool force_vertical,
uint64_t object_tag) {
m_bVertical = force_vertical;
m_ObjectTag = object_tag;
m_FontDataAllocation = DataVector<uint8_t>(src_span.begin(), src_span.end());
m_Face = CFX_GEModule::Get()->GetFontMgr()->NewFixedFace(
nullptr, m_FontDataAllocation, 0);
m_bEmbedded = true;
m_FontData = m_FontDataAllocation;
return !!m_Face;
}
bool CFX_Font::IsTTFont() const {
return m_Face && FXFT_Is_Face_TT_OT(m_Face->GetRec()) == FT_FACE_FLAG_SFNT;
}
int CFX_Font::GetAscent() const {
if (!m_Face)
return 0;
int ascender = FXFT_Get_Face_Ascender(m_Face->GetRec());
if (ascender < kThousandthMinInt || ascender > kThousandthMaxInt)
return 0;
return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face->GetRec()), ascender);
}
int CFX_Font::GetDescent() const {
if (!m_Face)
return 0;
int descender = FXFT_Get_Face_Descender(m_Face->GetRec());
if (descender < kThousandthMinInt || descender > kThousandthMaxInt)
return 0;
return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face->GetRec()), descender);
}
absl::optional<FX_RECT> CFX_Font::GetGlyphBBox(uint32_t glyph_index) {
if (!m_Face)
return absl::nullopt;
if (FXFT_Is_Face_Tricky(m_Face->GetRec())) {
int error = FT_Set_Char_Size(m_Face->GetRec(), 0, 1000 * 64, 72, 72);
if (error)
return absl::nullopt;
error = FT_Load_Glyph(m_Face->GetRec(), glyph_index,
FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
if (error)
return absl::nullopt;
FT_Glyph glyph;
error = FT_Get_Glyph(m_Face->GetRec()->glyph, &glyph);
if (error)
return absl::nullopt;
FT_BBox cbox;
FT_Glyph_Get_CBox(glyph, FT_GLYPH_BBOX_PIXELS, &cbox);
int pixel_size_x = m_Face->GetRec()->size->metrics.x_ppem;
int pixel_size_y = m_Face->GetRec()->size->metrics.y_ppem;
FX_RECT result = ScaledFXRectFromFTPos(
cbox.xMin, cbox.yMax, cbox.xMax, cbox.yMin, pixel_size_x, pixel_size_y);
result.top =
std::min(result.top, pdfium::base::checked_cast<int32_t>(
FXFT_Get_Face_Ascender(m_Face->GetRec())));
result.bottom =
std::max(result.bottom, pdfium::base::checked_cast<int32_t>(
FXFT_Get_Face_Descender(m_Face->GetRec())));
FT_Done_Glyph(glyph);
if (FT_Set_Pixel_Sizes(m_Face->GetRec(), 0, 64) != 0)
return absl::nullopt;
return result;
}
constexpr int kFlag = FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH;
if (FT_Load_Glyph(m_Face->GetRec(), glyph_index, kFlag) != 0)
return absl::nullopt;
int em = FXFT_Get_Face_UnitsPerEM(m_Face->GetRec());
return ScaledFXRectFromFTPos(FXFT_Get_Glyph_HoriBearingX(m_Face->GetRec()),
FXFT_Get_Glyph_HoriBearingY(m_Face->GetRec()) -
FXFT_Get_Glyph_Height(m_Face->GetRec()),
FXFT_Get_Glyph_HoriBearingX(m_Face->GetRec()) +
FXFT_Get_Glyph_Width(m_Face->GetRec()),
FXFT_Get_Glyph_HoriBearingY(m_Face->GetRec()),
em, em);
}
bool CFX_Font::IsItalic() const {
if (!m_Face)
return false;
if (FXFT_Is_Face_Italic(m_Face->GetRec()) == FT_STYLE_FLAG_ITALIC)
return true;
ByteString str(FXFT_Get_Face_Style_Name(m_Face->GetRec()));
str.MakeLower();
return str.Contains("italic");
}
bool CFX_Font::IsBold() const {
return m_Face && FXFT_Is_Face_Bold(m_Face->GetRec()) == FT_STYLE_FLAG_BOLD;
}
bool CFX_Font::IsFixedWidth() const {
return m_Face && FXFT_Is_Face_fixedwidth(m_Face->GetRec()) != 0;
}
#if defined(_SKIA_SUPPORT_)
bool CFX_Font::IsSubstFontBold() const {
CFX_SubstFont* subst_font = GetSubstFont();
return subst_font && subst_font->GetOriginalWeight() >= FXFONT_FW_BOLD;
}
#endif
ByteString CFX_Font::GetPsName() const {
if (!m_Face)
return ByteString();
ByteString psName = FT_Get_Postscript_Name(m_Face->GetRec());
if (psName.IsEmpty())
psName = kUntitledFontName;
return psName;
}
ByteString CFX_Font::GetFamilyName() const {
if (!m_Face && !m_pSubstFont)
return ByteString();
if (m_Face)
return ByteString(FXFT_Get_Face_Family_Name(m_Face->GetRec()));
return m_pSubstFont->m_Family;
}
ByteString CFX_Font::GetFamilyNameOrUntitled() const {
ByteString facename = GetFamilyName();
return facename.IsEmpty() ? kUntitledFontName : facename;
}
ByteString CFX_Font::GetFaceName() const {
if (!m_Face && !m_pSubstFont)
return ByteString();
if (m_Face) {
ByteString style = ByteString(FXFT_Get_Face_Style_Name(m_Face->GetRec()));
ByteString facename = GetFamilyNameOrUntitled();
if (ShouldAppendStyle(style))
facename += " " + style;
return facename;
}
return m_pSubstFont->m_Family;
}
ByteString CFX_Font::GetBaseFontName() const {
ByteString psname = GetPsName();
if (!psname.IsEmpty() && psname != kUntitledFontName)
return psname;
if (m_Face) {
ByteString style = ByteString(FXFT_Get_Face_Style_Name(m_Face->GetRec()));
ByteString facename = GetFamilyNameOrUntitled();
if (IsTTFont())
facename.Remove(' ');
if (ShouldAppendStyle(style))
facename += (IsTTFont() ? "," : " ") + style;
return facename;
}
if (m_pSubstFont)
return m_pSubstFont->m_Family;
return ByteString();
}
absl::optional<FX_RECT> CFX_Font::GetRawBBox() const {
if (!m_Face)
return absl::nullopt;
return FXRectFromFTPos(FXFT_Get_Face_xMin(m_Face->GetRec()),
FXFT_Get_Face_yMin(m_Face->GetRec()),
FXFT_Get_Face_xMax(m_Face->GetRec()),
FXFT_Get_Face_yMax(m_Face->GetRec()));
}
absl::optional<FX_RECT> CFX_Font::GetBBox() const {
absl::optional<FX_RECT> result = GetRawBBox();
if (!result.has_value())
return result;
int em = FXFT_Get_Face_UnitsPerEM(m_Face->GetRec());
if (em != 0) {
FX_RECT& bbox = result.value();
bbox.left = (bbox.left * 1000) / em;
bbox.top = (bbox.top * 1000) / em;
bbox.right = (bbox.right * 1000) / em;
bbox.bottom = (bbox.bottom * 1000) / em;
}
return result;
}
void CFX_Font::AllocSubData(size_t size) {
m_pSubData.reset(FX_Alloc(uint8_t, size));
}
RetainPtr<CFX_GlyphCache> CFX_Font::GetOrCreateGlyphCache() const {
if (!m_GlyphCache)
m_GlyphCache = CFX_GEModule::Get()->GetFontCache()->GetGlyphCache(this);
return m_GlyphCache;
}
void CFX_Font::ClearGlyphCache() {
m_GlyphCache = nullptr;
}
void CFX_Font::AdjustMMParams(int glyph_index,
int dest_width,
int weight) const {
DCHECK(dest_width >= 0);
FXFT_MM_VarPtr pMasters = nullptr;
FT_Get_MM_Var(m_Face->GetRec(), &pMasters);
if (!pMasters)
return;
FT_Pos coords[2];
if (weight == 0)
coords[0] = FXFT_Get_MM_Axis_Def(FXFT_Get_MM_Axis(pMasters, 0)) / 65536;
else
coords[0] = weight;
if (dest_width == 0) {
coords[1] = FXFT_Get_MM_Axis_Def(FXFT_Get_MM_Axis(pMasters, 1)) / 65536;
} else {
FT_Long min_param =
FXFT_Get_MM_Axis_Min(FXFT_Get_MM_Axis(pMasters, 1)) / 65536;
FT_Long max_param =
FXFT_Get_MM_Axis_Max(FXFT_Get_MM_Axis(pMasters, 1)) / 65536;
coords[1] = min_param;
FT_Set_MM_Design_Coordinates(m_Face->GetRec(), 2, coords);
FT_Load_Glyph(m_Face->GetRec(), glyph_index,
FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
FT_Pos min_width = FXFT_Get_Glyph_HoriAdvance(m_Face->GetRec()) * 1000 /
FXFT_Get_Face_UnitsPerEM(m_Face->GetRec());
coords[1] = max_param;
FT_Set_MM_Design_Coordinates(m_Face->GetRec(), 2, coords);
FT_Load_Glyph(m_Face->GetRec(), glyph_index,
FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
FT_Pos max_width = FXFT_Get_Glyph_HoriAdvance(m_Face->GetRec()) * 1000 /
FXFT_Get_Face_UnitsPerEM(m_Face->GetRec());
if (max_width == min_width) {
FreeMMVar(m_Face->GetRec(), pMasters);
return;
}
FT_Pos param = min_param + (max_param - min_param) *
(dest_width - min_width) /
(max_width - min_width);
coords[1] = param;
}
FreeMMVar(m_Face->GetRec(), pMasters);
FT_Set_MM_Design_Coordinates(m_Face->GetRec(), 2, coords);
}
std::unique_ptr<CFX_Path> CFX_Font::LoadGlyphPathImpl(uint32_t glyph_index,
int dest_width) const {
if (!m_Face)
return nullptr;
FT_Set_Pixel_Sizes(m_Face->GetRec(), 0, 64);
FT_Matrix ft_matrix = {65536, 0, 0, 65536};
if (m_pSubstFont) {
if (m_pSubstFont->m_ItalicAngle) {
int skew = GetSkewFromAngle(m_pSubstFont->m_ItalicAngle);
if (m_bVertical)
ft_matrix.yx += ft_matrix.yy * skew / 100;
else
ft_matrix.xy -= ft_matrix.xx * skew / 100;
}
if (m_pSubstFont->IsBuiltInGenericFont())
AdjustMMParams(glyph_index, dest_width, m_pSubstFont->m_Weight);
}
ScopedFontTransform scoped_transform(m_Face, &ft_matrix);
int load_flags = FT_LOAD_NO_BITMAP;
if (!(m_Face->GetRec()->face_flags & FT_FACE_FLAG_SFNT) ||
!FT_IS_TRICKY(m_Face->GetRec()))
load_flags |= FT_LOAD_NO_HINTING;
if (FT_Load_Glyph(m_Face->GetRec(), glyph_index, load_flags))
return nullptr;
if (m_pSubstFont && !m_pSubstFont->IsBuiltInGenericFont() &&
m_pSubstFont->m_Weight > 400) {
uint32_t index = std::min<uint32_t>((m_pSubstFont->m_Weight - 400) / 10,
kWeightPowArraySize - 1);
int level;
if (m_pSubstFont->m_Charset == FX_Charset::kShiftJIS)
level = kWeightPowShiftJis[index] * 65536 / 36655;
else
level = kWeightPow[index];
FT_Outline_Embolden(FXFT_Get_Glyph_Outline(m_Face->GetRec()), 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(FXFT_Get_Glyph_Outline(m_Face->GetRec()), &funcs,
&params);
if (pPath->GetPoints().empty())
return nullptr;
Outline_CheckEmptyContour(&params);
pPath->ClosePath();
return pPath;
}
const CFX_GlyphBitmap* CFX_Font::LoadGlyphBitmap(
uint32_t glyph_index,
bool bFontStyle,
const CFX_Matrix& matrix,
int dest_width,
int anti_alias,
CFX_TextRenderOptions* text_options) const {
return GetOrCreateGlyphCache()->LoadGlyphBitmap(this, glyph_index, bFontStyle,
matrix, dest_width,
anti_alias, text_options);
}
const CFX_Path* CFX_Font::LoadGlyphPath(uint32_t glyph_index,
int dest_width) const {
return GetOrCreateGlyphCache()->LoadGlyphPath(this, glyph_index, dest_width);
}
// static
int CFX_Font::GetWeightLevel(FX_Charset charset, size_t index) {
if (index >= kWeightPowArraySize)
return -1;
if (charset == FX_Charset::kShiftJIS)
return kWeightPowShiftJis[index];
return kWeightPow11[index];
}
// static
int CFX_Font::GetSkewFromAngle(int angle) {
// |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];
}
#if defined(_SKIA_SUPPORT_)
CFX_TypeFace* CFX_Font::GetDeviceCache() const {
return GetOrCreateGlyphCache()->GetDeviceCache(this);
}
#endif
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