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
CPDF_CharPosList()12 CPDF_CharPosList::CPDF_CharPosList() {
13 m_pCharPos = nullptr;
14 m_nChars = 0;
15 }
16
~CPDF_CharPosList()17 CPDF_CharPosList::~CPDF_CharPosList() {
18 FX_Free(m_pCharPos);
19 }
20
Load(const std::vector<uint32_t> & charCodes,const std::vector<float> & charPos,CPDF_Font * pFont,float FontSize)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