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// Copyright 2016 PDFium Authors. All rights reserved.
// 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/fpdfapi/render/cpdf_charposlist.h"
#include "core/fpdfapi/font/cpdf_cidfont.h"
#include "core/fpdfapi/font/cpdf_font.h"
#include "third_party/base/stl_util.h"
CPDF_CharPosList::CPDF_CharPosList() {
m_pCharPos = nullptr;
m_nChars = 0;
}
CPDF_CharPosList::~CPDF_CharPosList() {
FX_Free(m_pCharPos);
}
void CPDF_CharPosList::Load(const std::vector<uint32_t>& charCodes,
const std::vector<float>& charPos,
CPDF_Font* pFont,
float FontSize) {
int nChars = pdfium::CollectionSize<int>(charCodes);
m_pCharPos = FX_Alloc(FXTEXT_CHARPOS, nChars);
m_nChars = 0;
CPDF_CIDFont* pCIDFont = pFont->AsCIDFont();
bool bVertWriting = pCIDFont && pCIDFont->IsVertWriting();
for (int iChar = 0; iChar < nChars; iChar++) {
uint32_t CharCode = charCodes[iChar];
if (CharCode == static_cast<uint32_t>(-1))
continue;
bool bVert = false;
FXTEXT_CHARPOS& charpos = m_pCharPos[m_nChars++];
if (pCIDFont)
charpos.m_bFontStyle = true;
CFX_WideString unicode = pFont->UnicodeFromCharCode(CharCode);
charpos.m_Unicode = !unicode.IsEmpty() ? unicode[0] : CharCode;
charpos.m_GlyphIndex = pFont->GlyphFromCharCode(CharCode, &bVert);
uint32_t GlyphID = charpos.m_GlyphIndex;
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
charpos.m_ExtGID = pFont->GlyphFromCharCodeExt(CharCode);
GlyphID = charpos.m_ExtGID;
#endif
CFX_Font* pCurrentFont;
if (GlyphID != static_cast<uint32_t>(-1)) {
charpos.m_FallbackFontPosition = -1;
pCurrentFont = pFont->GetFont();
} else {
charpos.m_FallbackFontPosition =
pFont->FallbackFontFromCharcode(CharCode);
charpos.m_GlyphIndex = pFont->FallbackGlyphFromCharcode(
charpos.m_FallbackFontPosition, CharCode);
pCurrentFont = pFont->GetFontFallback(charpos.m_FallbackFontPosition);
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
charpos.m_ExtGID = charpos.m_GlyphIndex;
#endif
}
if (!pFont->IsEmbedded() && !pFont->IsCIDFont())
charpos.m_FontCharWidth = pFont->GetCharWidthF(CharCode);
else
charpos.m_FontCharWidth = 0;
charpos.m_Origin = CFX_PointF(iChar ? charPos[iChar - 1] : 0, 0);
charpos.m_bGlyphAdjust = false;
float scalingFactor = 1.0f;
if (!pFont->IsEmbedded() && pFont->HasFontWidths() && !bVertWriting &&
!(pCurrentFont->GetSubstFont()->m_SubstFlags & FXFONT_SUBST_MM)) {
int pdfGlyphWidth = pFont->GetCharWidthF(CharCode);
int ftGlyphWidth =
pCurrentFont ? pCurrentFont->GetGlyphWidth(charpos.m_GlyphIndex) : 0;
if (ftGlyphWidth && pdfGlyphWidth > ftGlyphWidth + 1) {
// Move the initial x position by half of the excess (transformed to
// text space coordinates).
charpos.m_Origin.x +=
(pdfGlyphWidth - ftGlyphWidth) * FontSize / 2000.0f;
} else if (pdfGlyphWidth && ftGlyphWidth &&
pdfGlyphWidth < ftGlyphWidth) {
scalingFactor = static_cast<float>(pdfGlyphWidth) / ftGlyphWidth;
ASSERT(scalingFactor >= 0.0f);
charpos.m_AdjustMatrix[0] = scalingFactor;
charpos.m_AdjustMatrix[1] = 0.0f;
charpos.m_AdjustMatrix[2] = 0.0f;
charpos.m_AdjustMatrix[3] = 1.0f;
charpos.m_bGlyphAdjust = true;
}
}
if (!pCIDFont)
continue;
uint16_t CID = pCIDFont->CIDFromCharCode(CharCode);
if (bVertWriting) {
charpos.m_Origin = CFX_PointF(0, charpos.m_Origin.x);
short vx;
short vy;
pCIDFont->GetVertOrigin(CID, vx, vy);
charpos.m_Origin.x -= FontSize * vx / 1000;
charpos.m_Origin.y -= FontSize * vy / 1000;
}
const uint8_t* pTransform = pCIDFont->GetCIDTransform(CID);
if (pTransform && !bVert) {
charpos.m_AdjustMatrix[0] =
pCIDFont->CIDTransformToFloat(pTransform[0]) * scalingFactor;
charpos.m_AdjustMatrix[1] =
pCIDFont->CIDTransformToFloat(pTransform[1]) * scalingFactor;
charpos.m_AdjustMatrix[2] = pCIDFont->CIDTransformToFloat(pTransform[2]);
charpos.m_AdjustMatrix[3] = pCIDFont->CIDTransformToFloat(pTransform[3]);
charpos.m_Origin.x +=
pCIDFont->CIDTransformToFloat(pTransform[4]) * FontSize;
charpos.m_Origin.y +=
pCIDFont->CIDTransformToFloat(pTransform[5]) * FontSize;
charpos.m_bGlyphAdjust = true;
}
}
}
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