// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fxge/include/fx_font.h"
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#include "core/fpdfapi/fpdf_font/include/cpdf_font.h"
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#include "core/fxge/ge/fx_text_int.h"
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#include "core/fxge/include/fx_freetype.h"
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#include "core/fxge/include/fx_ge.h"
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#define EM_ADJUST(em, a) (em == 0 ? (a) : (a)*1000 / em)
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namespace {
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#ifdef PDF_ENABLE_XFA
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const uint32_t g_EncodingID[] = {
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FXFM_ENCODING_MS_SYMBOL, FXFM_ENCODING_UNICODE,
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FXFM_ENCODING_MS_SJIS, FXFM_ENCODING_MS_GB2312,
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FXFM_ENCODING_MS_BIG5, FXFM_ENCODING_MS_WANSUNG,
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FXFM_ENCODING_MS_JOHAB, FXFM_ENCODING_ADOBE_STANDARD,
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FXFM_ENCODING_ADOBE_EXPERT, FXFM_ENCODING_ADOBE_CUSTOM,
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FXFM_ENCODING_ADOBE_LATIN_1, FXFM_ENCODING_OLD_LATIN_2,
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FXFM_ENCODING_APPLE_ROMAN,
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};
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CFX_UnicodeEncodingEx* _FXFM_CreateFontEncoding(CFX_Font* pFont,
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uint32_t nEncodingID) {
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if (FXFT_Select_Charmap(pFont->GetFace(), nEncodingID))
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return nullptr;
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return new CFX_UnicodeEncodingEx(pFont, nEncodingID);
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}
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#endif // PDF_ENABLE_XFA
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FXFT_Face FT_LoadFont(const uint8_t* pData, int size) {
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return CFX_GEModule::Get()->GetFontMgr()->GetFixedFace(pData, size, 0);
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}
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} // namespace
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CFX_Font::CFX_Font()
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#ifdef PDF_ENABLE_XFA
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: m_bLogic(FALSE),
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m_pOwnedStream(nullptr),
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m_Face(nullptr),
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#else
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: m_Face(nullptr),
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#endif // PDF_ENABLE_XFA
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m_pSubstFont(nullptr),
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m_pFontDataAllocation(nullptr),
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m_pFontData(nullptr),
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m_pGsubData(nullptr),
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m_dwSize(0),
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#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
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m_pPlatformFont(nullptr),
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#endif
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m_bEmbedded(FALSE),
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m_bVertical(FALSE) {
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}
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#ifdef PDF_ENABLE_XFA
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FX_BOOL CFX_Font::LoadClone(const CFX_Font* pFont) {
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if (!pFont)
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return FALSE;
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m_bLogic = TRUE;
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if (pFont->m_pSubstFont) {
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m_pSubstFont = new CFX_SubstFont;
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m_pSubstFont->m_Charset = pFont->m_pSubstFont->m_Charset;
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m_pSubstFont->m_ExtHandle = pFont->m_pSubstFont->m_ExtHandle;
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m_pSubstFont->m_SubstFlags = pFont->m_pSubstFont->m_SubstFlags;
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m_pSubstFont->m_Weight = pFont->m_pSubstFont->m_Weight;
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m_pSubstFont->m_Family = pFont->m_pSubstFont->m_Family;
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m_pSubstFont->m_ItalicAngle = pFont->m_pSubstFont->m_ItalicAngle;
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}
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if (pFont->m_OtfFontData.GetSize()) {
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m_OtfFontData.AttachData(pFont->m_OtfFontData.GetBuffer(),
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pFont->m_OtfFontData.GetSize());
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}
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m_Face = pFont->m_Face;
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m_bEmbedded = pFont->m_bEmbedded;
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m_bVertical = pFont->m_bVertical;
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m_dwSize = pFont->m_dwSize;
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m_pFontData = pFont->m_pFontData;
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m_pGsubData = pFont->m_pGsubData;
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#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
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m_pPlatformFont = pFont->m_pPlatformFont;
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#endif
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m_pOwnedStream = pFont->m_pOwnedStream;
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return TRUE;
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}
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#endif // PDF_ENABLE_XFA
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CFX_Font::~CFX_Font() {
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delete m_pSubstFont;
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FX_Free(m_pFontDataAllocation);
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#ifdef PDF_ENABLE_XFA
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if (m_bLogic) {
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m_OtfFontData.DetachBuffer();
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return;
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}
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#endif // PDF_ENABLE_XFA
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if (m_Face) {
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#ifndef PDF_ENABLE_XFA
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if (FXFT_Get_Face_External_Stream(m_Face)) {
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FXFT_Clear_Face_External_Stream(m_Face);
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}
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#endif // PDF_ENABLE_XFA
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if (m_bEmbedded) {
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DeleteFace();
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} else {
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CFX_GEModule::Get()->GetFontMgr()->ReleaseFace(m_Face);
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}
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}
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#ifdef PDF_ENABLE_XFA
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FX_Free(m_pOwnedStream);
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#endif // PDF_ENABLE_XFA
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FX_Free(m_pGsubData);
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#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
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ReleasePlatformResource();
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#endif
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}
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void CFX_Font::DeleteFace() {
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FXFT_Done_Face(m_Face);
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m_Face = nullptr;
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}
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void CFX_Font::LoadSubst(const CFX_ByteString& face_name,
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FX_BOOL bTrueType,
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uint32_t flags,
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int weight,
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int italic_angle,
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int CharsetCP,
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FX_BOOL bVertical) {
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m_bEmbedded = FALSE;
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m_bVertical = bVertical;
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m_pSubstFont = new CFX_SubstFont;
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m_Face = CFX_GEModule::Get()->GetFontMgr()->FindSubstFont(
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face_name, bTrueType, flags, weight, italic_angle, CharsetCP,
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m_pSubstFont);
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#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
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if (m_pSubstFont->m_ExtHandle) {
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m_pPlatformFont = m_pSubstFont->m_ExtHandle;
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m_pSubstFont->m_ExtHandle = nullptr;
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}
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#endif
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if (m_Face) {
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m_pFontData = FXFT_Get_Face_Stream_Base(m_Face);
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m_dwSize = FXFT_Get_Face_Stream_Size(m_Face);
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}
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}
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#ifdef PDF_ENABLE_XFA
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extern "C" {
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unsigned long _FTStreamRead(FXFT_Stream stream,
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unsigned long offset,
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unsigned char* buffer,
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unsigned long count) {
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if (count == 0) {
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return 0;
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}
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IFX_FileRead* pFile = (IFX_FileRead*)stream->descriptor.pointer;
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int res = pFile->ReadBlock(buffer, offset, count);
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if (res) {
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return count;
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}
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return 0;
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}
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void _FTStreamClose(FXFT_Stream stream) {}
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};
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FX_BOOL _LoadFile(FXFT_Library library,
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FXFT_Face* Face,
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IFX_FileRead* pFile,
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FXFT_Stream* stream,
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int32_t faceIndex = 0) {
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FXFT_Stream stream1 = (FXFT_Stream)FX_Alloc(uint8_t, sizeof(FXFT_StreamRec));
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stream1->base = nullptr;
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stream1->size = (unsigned long)pFile->GetSize();
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stream1->pos = 0;
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stream1->descriptor.pointer = pFile;
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stream1->close = _FTStreamClose;
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stream1->read = _FTStreamRead;
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FXFT_Open_Args args;
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args.flags = FT_OPEN_STREAM;
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args.stream = stream1;
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if (FXFT_Open_Face(library, &args, faceIndex, Face)) {
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FX_Free(stream1);
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return FALSE;
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}
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if (stream) {
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*stream = stream1;
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}
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return TRUE;
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}
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FX_BOOL CFX_Font::LoadFile(IFX_FileRead* pFile,
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int nFaceIndex,
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int* pFaceCount) {
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m_bEmbedded = FALSE;
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CFX_FontMgr* pFontMgr = CFX_GEModule::Get()->GetFontMgr();
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pFontMgr->InitFTLibrary();
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FXFT_Library library = pFontMgr->GetFTLibrary();
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FXFT_Stream stream = nullptr;
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if (!_LoadFile(library, &m_Face, pFile, &stream, nFaceIndex))
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return FALSE;
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if (pFaceCount)
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*pFaceCount = (int)m_Face->num_faces;
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m_pOwnedStream = stream;
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FXFT_Set_Pixel_Sizes(m_Face, 0, 64);
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return TRUE;
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}
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#endif // PDF_ENABLE_XFA
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int CFX_Font::GetGlyphWidth(uint32_t glyph_index) {
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if (!m_Face) {
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return 0;
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}
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if (m_pSubstFont && (m_pSubstFont->m_SubstFlags & FXFONT_SUBST_MM)) {
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AdjustMMParams(glyph_index, 0, 0);
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}
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int err = FXFT_Load_Glyph(
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m_Face, glyph_index,
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FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
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if (err) {
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return 0;
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}
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int width = EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
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FXFT_Get_Glyph_HoriAdvance(m_Face));
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return width;
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}
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FX_BOOL CFX_Font::LoadEmbedded(const uint8_t* data, uint32_t size) {
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m_pFontDataAllocation = FX_Alloc(uint8_t, size);
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FXSYS_memcpy(m_pFontDataAllocation, data, size);
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m_Face = FT_LoadFont(m_pFontDataAllocation, size);
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m_pFontData = m_pFontDataAllocation;
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m_bEmbedded = TRUE;
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m_dwSize = size;
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return !!m_Face;
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}
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FX_BOOL CFX_Font::IsTTFont() const {
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if (!m_Face)
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return FALSE;
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return FXFT_Is_Face_TT_OT(m_Face) == FXFT_FACE_FLAG_SFNT;
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}
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int CFX_Font::GetAscent() const {
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if (!m_Face)
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return 0;
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return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
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FXFT_Get_Face_Ascender(m_Face));
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}
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int CFX_Font::GetDescent() const {
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if (!m_Face)
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return 0;
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return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
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FXFT_Get_Face_Descender(m_Face));
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}
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FX_BOOL CFX_Font::GetGlyphBBox(uint32_t glyph_index, FX_RECT& bbox) {
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if (!m_Face)
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return FALSE;
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if (FXFT_Is_Face_Tricky(m_Face)) {
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int error = FXFT_Set_Char_Size(m_Face, 0, 1000 * 64, 72, 72);
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if (error) {
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return FALSE;
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}
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error = FXFT_Load_Glyph(m_Face, glyph_index,
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FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH);
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if (error) {
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return FALSE;
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}
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FXFT_BBox cbox;
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FT_Glyph glyph;
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error = FXFT_Get_Glyph(((FXFT_Face)m_Face)->glyph, &glyph);
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if (error) {
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return FALSE;
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}
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FXFT_Glyph_Get_CBox(glyph, FXFT_GLYPH_BBOX_PIXELS, &cbox);
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int pixel_size_x = ((FXFT_Face)m_Face)->size->metrics.x_ppem,
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pixel_size_y = ((FXFT_Face)m_Face)->size->metrics.y_ppem;
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if (pixel_size_x == 0 || pixel_size_y == 0) {
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bbox.left = cbox.xMin;
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bbox.right = cbox.xMax;
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bbox.top = cbox.yMax;
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bbox.bottom = cbox.yMin;
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} else {
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bbox.left = cbox.xMin * 1000 / pixel_size_x;
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bbox.right = cbox.xMax * 1000 / pixel_size_x;
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bbox.top = cbox.yMax * 1000 / pixel_size_y;
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bbox.bottom = cbox.yMin * 1000 / pixel_size_y;
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}
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if (bbox.top > FXFT_Get_Face_Ascender(m_Face)) {
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bbox.top = FXFT_Get_Face_Ascender(m_Face);
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}
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if (bbox.bottom < FXFT_Get_Face_Descender(m_Face)) {
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bbox.bottom = FXFT_Get_Face_Descender(m_Face);
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}
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FT_Done_Glyph(glyph);
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return FXFT_Set_Pixel_Sizes(m_Face, 0, 64) == 0;
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}
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if (FXFT_Load_Glyph(
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m_Face, glyph_index,
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FXFT_LOAD_NO_SCALE | FXFT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH)) {
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return FALSE;
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}
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int em = FXFT_Get_Face_UnitsPerEM(m_Face);
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if (em == 0) {
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bbox.left = FXFT_Get_Glyph_HoriBearingX(m_Face);
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bbox.bottom = FXFT_Get_Glyph_HoriBearingY(m_Face);
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bbox.top = bbox.bottom - FXFT_Get_Glyph_Height(m_Face);
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bbox.right = bbox.left + FXFT_Get_Glyph_Width(m_Face);
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} else {
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bbox.left = FXFT_Get_Glyph_HoriBearingX(m_Face) * 1000 / em;
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bbox.top =
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(FXFT_Get_Glyph_HoriBearingY(m_Face) - FXFT_Get_Glyph_Height(m_Face)) *
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1000 / em;
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bbox.right =
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(FXFT_Get_Glyph_HoriBearingX(m_Face) + FXFT_Get_Glyph_Width(m_Face)) *
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1000 / em;
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bbox.bottom = (FXFT_Get_Glyph_HoriBearingY(m_Face)) * 1000 / em;
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}
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return TRUE;
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}
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FX_BOOL CFX_Font::IsItalic() const {
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if (!m_Face)
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return FALSE;
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FX_BOOL ret = FXFT_Is_Face_Italic(m_Face) == FXFT_STYLE_FLAG_ITALIC;
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if (!ret) {
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CFX_ByteString str(FXFT_Get_Face_Style_Name(m_Face));
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str.MakeLower();
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if (str.Find("italic") != -1) {
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ret = TRUE;
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}
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}
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return ret;
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}
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FX_BOOL CFX_Font::IsBold() const {
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if (!m_Face)
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return FALSE;
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return FXFT_Is_Face_Bold(m_Face) == FXFT_STYLE_FLAG_BOLD;
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}
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FX_BOOL CFX_Font::IsFixedWidth() const {
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if (!m_Face)
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return FALSE;
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return FXFT_Is_Face_fixedwidth(m_Face);
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}
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CFX_ByteString CFX_Font::GetPsName() const {
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if (!m_Face)
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return CFX_ByteString();
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CFX_ByteString psName = FXFT_Get_Postscript_Name(m_Face);
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if (psName.IsEmpty())
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psName = "Untitled";
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return psName;
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}
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CFX_ByteString CFX_Font::GetFamilyName() const {
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if (!m_Face && !m_pSubstFont) {
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return CFX_ByteString();
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}
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if (m_Face) {
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return CFX_ByteString(FXFT_Get_Face_Family_Name(m_Face));
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}
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return m_pSubstFont->m_Family;
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}
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CFX_ByteString CFX_Font::GetFaceName() const {
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if (!m_Face && !m_pSubstFont) {
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return CFX_ByteString();
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}
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if (m_Face) {
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CFX_ByteString facename;
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CFX_ByteString style = CFX_ByteString(FXFT_Get_Face_Style_Name(m_Face));
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facename = GetFamilyName();
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if (facename.IsEmpty()) {
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facename = "Untitled";
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}
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if (!style.IsEmpty() && style != "Regular") {
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facename += " " + style;
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}
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return facename;
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}
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return m_pSubstFont->m_Family;
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}
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FX_BOOL CFX_Font::GetBBox(FX_RECT& bbox) {
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if (!m_Face) {
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return FALSE;
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}
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int em = FXFT_Get_Face_UnitsPerEM(m_Face);
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if (em == 0) {
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bbox.left = FXFT_Get_Face_xMin(m_Face);
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bbox.bottom = FXFT_Get_Face_yMax(m_Face);
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bbox.top = FXFT_Get_Face_yMin(m_Face);
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bbox.right = FXFT_Get_Face_xMax(m_Face);
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} else {
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bbox.left = FXFT_Get_Face_xMin(m_Face) * 1000 / em;
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bbox.top = FXFT_Get_Face_yMin(m_Face) * 1000 / em;
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bbox.right = FXFT_Get_Face_xMax(m_Face) * 1000 / em;
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bbox.bottom = FXFT_Get_Face_yMax(m_Face) * 1000 / em;
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}
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return TRUE;
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}
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int CFX_Font::GetHeight() const {
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if (!m_Face)
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return 0;
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return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
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FXFT_Get_Face_Height(m_Face));
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}
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int CFX_Font::GetMaxAdvanceWidth() const {
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if (!m_Face)
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return 0;
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return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
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FXFT_Get_Face_MaxAdvanceWidth(m_Face));
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}
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int CFX_Font::GetULPos() const {
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if (!m_Face)
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return 0;
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return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
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FXFT_Get_Face_UnderLinePosition(m_Face));
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}
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int CFX_Font::GetULthickness() const {
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if (!m_Face)
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return 0;
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return EM_ADJUST(FXFT_Get_Face_UnitsPerEM(m_Face),
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FXFT_Get_Face_UnderLineThickness(m_Face));
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}
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CFX_UnicodeEncoding::CFX_UnicodeEncoding(CFX_Font* pFont) : m_pFont(pFont) {}
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CFX_UnicodeEncoding::~CFX_UnicodeEncoding() {}
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uint32_t CFX_UnicodeEncoding::GlyphFromCharCode(uint32_t charcode) {
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FXFT_Face face = m_pFont->GetFace();
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if (!face)
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return charcode;
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if (FXFT_Select_Charmap(face, FXFT_ENCODING_UNICODE) == 0)
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return FXFT_Get_Char_Index(face, charcode);
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if (m_pFont->GetSubstFont() &&
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m_pFont->GetSubstFont()->m_Charset == FXFONT_SYMBOL_CHARSET) {
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uint32_t index = 0;
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if (FXFT_Select_Charmap(face, FXFT_ENCODING_MS_SYMBOL) == 0)
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index = FXFT_Get_Char_Index(face, charcode);
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if (!index && !FXFT_Select_Charmap(face, FXFT_ENCODING_APPLE_ROMAN))
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return FXFT_Get_Char_Index(face, charcode);
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}
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return charcode;
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}
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#ifdef PDF_ENABLE_XFA
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CFX_UnicodeEncodingEx::CFX_UnicodeEncodingEx(CFX_Font* pFont,
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uint32_t EncodingID)
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: CFX_UnicodeEncoding(pFont), m_nEncodingID(EncodingID) {}
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CFX_UnicodeEncodingEx::~CFX_UnicodeEncodingEx() {}
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uint32_t CFX_UnicodeEncodingEx::GlyphFromCharCode(uint32_t charcode) {
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FXFT_Face face = m_pFont->GetFace();
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FT_UInt nIndex = FXFT_Get_Char_Index(face, charcode);
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if (nIndex > 0) {
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return nIndex;
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}
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int nmaps = FXFT_Get_Face_CharmapCount(face);
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int m = 0;
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while (m < nmaps) {
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uint32_t nEncodingID =
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FXFT_Get_Charmap_Encoding(FXFT_Get_Face_Charmaps(face)[m++]);
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if (m_nEncodingID == nEncodingID) {
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continue;
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}
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int error = FXFT_Select_Charmap(face, nEncodingID);
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if (error) {
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continue;
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}
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nIndex = FXFT_Get_Char_Index(face, charcode);
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if (nIndex > 0) {
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m_nEncodingID = nEncodingID;
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return nIndex;
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}
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}
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FXFT_Select_Charmap(face, m_nEncodingID);
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return 0;
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}
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uint32_t CFX_UnicodeEncodingEx::CharCodeFromUnicode(FX_WCHAR Unicode) const {
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if (m_nEncodingID == FXFM_ENCODING_UNICODE ||
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m_nEncodingID == FXFM_ENCODING_MS_SYMBOL) {
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return Unicode;
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}
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FXFT_Face face = m_pFont->GetFace();
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int nmaps = FXFT_Get_Face_CharmapCount(face);
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for (int i = 0; i < nmaps; i++) {
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int nEncodingID =
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FXFT_Get_Charmap_Encoding(FXFT_Get_Face_Charmaps(face)[i]);
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if (nEncodingID == FXFM_ENCODING_UNICODE ||
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nEncodingID == FXFM_ENCODING_MS_SYMBOL) {
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return Unicode;
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}
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}
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return CPDF_Font::kInvalidCharCode;
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}
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CFX_UnicodeEncodingEx* FX_CreateFontEncodingEx(CFX_Font* pFont,
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uint32_t nEncodingID) {
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if (!pFont || !pFont->GetFace())
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return nullptr;
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if (nEncodingID != FXFM_ENCODING_NONE)
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return _FXFM_CreateFontEncoding(pFont, nEncodingID);
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for (size_t i = 0; i < FX_ArraySize(g_EncodingID); ++i) {
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CFX_UnicodeEncodingEx* pFontEncoding =
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_FXFM_CreateFontEncoding(pFont, g_EncodingID[i]);
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if (pFontEncoding) {
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return pFontEncoding;
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}
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}
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return nullptr;
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}
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#endif // PDF_ENABLE_XFA
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