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      1 // Copyright 2016 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #include "core/fpdfapi/render/cpdf_charposlist.h"
      8 
      9 #include "core/fpdfapi/font/cpdf_cidfont.h"
     10 #include "core/fpdfapi/font/cpdf_font.h"
     11 
     12 CPDF_CharPosList::CPDF_CharPosList() {
     13   m_pCharPos = nullptr;
     14   m_nChars = 0;
     15 }
     16 
     17 CPDF_CharPosList::~CPDF_CharPosList() {
     18   FX_Free(m_pCharPos);
     19 }
     20 
     21 void CPDF_CharPosList::Load(const std::vector<uint32_t>& charCodes,
     22                             const std::vector<float>& charPos,
     23                             CPDF_Font* pFont,
     24                             float FontSize) {
     25   m_pCharPos = FX_Alloc(FXTEXT_CHARPOS, charCodes.size());
     26   m_nChars = 0;
     27   CPDF_CIDFont* pCIDFont = pFont->AsCIDFont();
     28   bool bVertWriting = pCIDFont && pCIDFont->IsVertWriting();
     29   for (size_t iChar = 0; iChar < charCodes.size(); ++iChar) {
     30     uint32_t CharCode = charCodes[iChar];
     31     if (CharCode == static_cast<uint32_t>(-1))
     32       continue;
     33 
     34     bool bVert = false;
     35     FXTEXT_CHARPOS& charpos = m_pCharPos[m_nChars++];
     36     if (pCIDFont)
     37       charpos.m_bFontStyle = true;
     38     WideString unicode = pFont->UnicodeFromCharCode(CharCode);
     39     charpos.m_Unicode = !unicode.IsEmpty() ? unicode[0] : CharCode;
     40     charpos.m_GlyphIndex = pFont->GlyphFromCharCode(CharCode, &bVert);
     41     uint32_t GlyphID = charpos.m_GlyphIndex;
     42 #if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
     43     charpos.m_ExtGID = pFont->GlyphFromCharCodeExt(CharCode);
     44     GlyphID = charpos.m_ExtGID;
     45 #endif
     46     CFX_Font* pCurrentFont;
     47     if (GlyphID != static_cast<uint32_t>(-1)) {
     48       charpos.m_FallbackFontPosition = -1;
     49       pCurrentFont = pFont->GetFont();
     50     } else {
     51       charpos.m_FallbackFontPosition =
     52           pFont->FallbackFontFromCharcode(CharCode);
     53       charpos.m_GlyphIndex = pFont->FallbackGlyphFromCharcode(
     54           charpos.m_FallbackFontPosition, CharCode);
     55       pCurrentFont = pFont->GetFontFallback(charpos.m_FallbackFontPosition);
     56 #if _FX_PLATFORM_ == _FX_PLATFORM_APPLE_
     57       charpos.m_ExtGID = charpos.m_GlyphIndex;
     58 #endif
     59     }
     60 
     61     if (!pFont->IsEmbedded() && !pFont->IsCIDFont())
     62       charpos.m_FontCharWidth = pFont->GetCharWidthF(CharCode);
     63     else
     64       charpos.m_FontCharWidth = 0;
     65 
     66     charpos.m_Origin = CFX_PointF(iChar > 0 ? charPos[iChar - 1] : 0, 0);
     67     charpos.m_bGlyphAdjust = false;
     68 
     69     float scalingFactor = 1.0f;
     70     if (!pFont->IsEmbedded() && pFont->HasFontWidths() && !bVertWriting &&
     71         !pCurrentFont->GetSubstFont()->m_bFlagMM) {
     72       int pdfGlyphWidth = pFont->GetCharWidthF(CharCode);
     73       int ftGlyphWidth =
     74           pCurrentFont ? pCurrentFont->GetGlyphWidth(charpos.m_GlyphIndex) : 0;
     75       if (ftGlyphWidth && pdfGlyphWidth > ftGlyphWidth + 1) {
     76         // Move the initial x position by half of the excess (transformed to
     77         // text space coordinates).
     78         charpos.m_Origin.x +=
     79             (pdfGlyphWidth - ftGlyphWidth) * FontSize / 2000.0f;
     80       } else if (pdfGlyphWidth && ftGlyphWidth &&
     81                  pdfGlyphWidth < ftGlyphWidth) {
     82         scalingFactor = static_cast<float>(pdfGlyphWidth) / ftGlyphWidth;
     83         ASSERT(scalingFactor >= 0.0f);
     84         charpos.m_AdjustMatrix[0] = scalingFactor;
     85         charpos.m_AdjustMatrix[1] = 0.0f;
     86         charpos.m_AdjustMatrix[2] = 0.0f;
     87         charpos.m_AdjustMatrix[3] = 1.0f;
     88         charpos.m_bGlyphAdjust = true;
     89       }
     90     }
     91     if (!pCIDFont)
     92       continue;
     93 
     94     uint16_t CID = pCIDFont->CIDFromCharCode(CharCode);
     95     if (bVertWriting) {
     96       charpos.m_Origin = CFX_PointF(0, charpos.m_Origin.x);
     97 
     98       short vx;
     99       short vy;
    100       pCIDFont->GetVertOrigin(CID, vx, vy);
    101       charpos.m_Origin.x -= FontSize * vx / 1000;
    102       charpos.m_Origin.y -= FontSize * vy / 1000;
    103     }
    104 
    105     const uint8_t* pTransform = pCIDFont->GetCIDTransform(CID);
    106     if (pTransform && !bVert) {
    107       charpos.m_AdjustMatrix[0] =
    108           pCIDFont->CIDTransformToFloat(pTransform[0]) * scalingFactor;
    109       charpos.m_AdjustMatrix[1] =
    110           pCIDFont->CIDTransformToFloat(pTransform[1]) * scalingFactor;
    111       charpos.m_AdjustMatrix[2] = pCIDFont->CIDTransformToFloat(pTransform[2]);
    112       charpos.m_AdjustMatrix[3] = pCIDFont->CIDTransformToFloat(pTransform[3]);
    113       charpos.m_Origin.x +=
    114           pCIDFont->CIDTransformToFloat(pTransform[4]) * FontSize;
    115       charpos.m_Origin.y +=
    116           pCIDFont->CIDTransformToFloat(pTransform[5]) * FontSize;
    117       charpos.m_bGlyphAdjust = true;
    118     }
    119   }
    120 }
    121