// Copyright 2016 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/fpdfapi/fpdf_page/include/cpdf_textobject.h"
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#include "core/fpdfapi/fpdf_font/cpdf_cidfont.h"
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#include "core/fpdfapi/fpdf_font/include/cpdf_font.h"
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CPDF_TextObject::CPDF_TextObject()
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: m_PosX(0),
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m_PosY(0),
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m_nChars(0),
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m_pCharCodes(nullptr),
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m_pCharPos(nullptr) {}
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CPDF_TextObject::~CPDF_TextObject() {
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if (m_nChars > 1) {
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FX_Free(m_pCharCodes);
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}
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FX_Free(m_pCharPos);
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}
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int CPDF_TextObject::CountItems() const {
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return m_nChars;
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}
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void CPDF_TextObject::GetItemInfo(int index, CPDF_TextObjectItem* pInfo) const {
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pInfo->m_CharCode =
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m_nChars == 1 ? (uint32_t)(uintptr_t)m_pCharCodes : m_pCharCodes[index];
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pInfo->m_OriginX = index ? m_pCharPos[index - 1] : 0;
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pInfo->m_OriginY = 0;
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if (pInfo->m_CharCode == CPDF_Font::kInvalidCharCode) {
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return;
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}
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CPDF_Font* pFont = m_TextState.GetFont();
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if (!pFont->IsCIDFont()) {
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return;
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}
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if (!pFont->AsCIDFont()->IsVertWriting()) {
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return;
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}
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uint16_t CID = pFont->AsCIDFont()->CIDFromCharCode(pInfo->m_CharCode);
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pInfo->m_OriginY = pInfo->m_OriginX;
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pInfo->m_OriginX = 0;
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short vx, vy;
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pFont->AsCIDFont()->GetVertOrigin(CID, vx, vy);
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FX_FLOAT fontsize = m_TextState.GetFontSize();
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pInfo->m_OriginX -= fontsize * vx / 1000;
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pInfo->m_OriginY -= fontsize * vy / 1000;
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}
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int CPDF_TextObject::CountChars() const {
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if (m_nChars == 1) {
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return 1;
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}
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int count = 0;
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for (int i = 0; i < m_nChars; ++i)
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if (m_pCharCodes[i] != CPDF_Font::kInvalidCharCode) {
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++count;
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}
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return count;
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}
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void CPDF_TextObject::GetCharInfo(int index,
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uint32_t& charcode,
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FX_FLOAT& kerning) const {
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if (m_nChars == 1) {
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charcode = (uint32_t)(uintptr_t)m_pCharCodes;
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kerning = 0;
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return;
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}
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int count = 0;
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for (int i = 0; i < m_nChars; ++i) {
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if (m_pCharCodes[i] != CPDF_Font::kInvalidCharCode) {
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if (count == index) {
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charcode = m_pCharCodes[i];
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if (i == m_nChars - 1 ||
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m_pCharCodes[i + 1] != CPDF_Font::kInvalidCharCode) {
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kerning = 0;
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} else {
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kerning = m_pCharPos[i];
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}
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return;
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}
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++count;
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}
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}
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}
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void CPDF_TextObject::GetCharInfo(int index, CPDF_TextObjectItem* pInfo) const {
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if (m_nChars == 1) {
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GetItemInfo(0, pInfo);
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return;
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}
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int count = 0;
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for (int i = 0; i < m_nChars; ++i) {
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uint32_t charcode = m_pCharCodes[i];
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if (charcode == CPDF_Font::kInvalidCharCode) {
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continue;
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}
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if (count == index) {
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GetItemInfo(i, pInfo);
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break;
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}
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++count;
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}
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}
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CPDF_TextObject* CPDF_TextObject::Clone() const {
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CPDF_TextObject* obj = new CPDF_TextObject;
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obj->CopyData(this);
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obj->m_nChars = m_nChars;
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if (m_nChars > 1) {
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obj->m_pCharCodes = FX_Alloc(uint32_t, m_nChars);
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FXSYS_memcpy(obj->m_pCharCodes, m_pCharCodes, m_nChars * sizeof(uint32_t));
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obj->m_pCharPos = FX_Alloc(FX_FLOAT, m_nChars - 1);
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FXSYS_memcpy(obj->m_pCharPos, m_pCharPos,
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(m_nChars - 1) * sizeof(FX_FLOAT));
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} else {
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obj->m_pCharCodes = m_pCharCodes;
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}
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obj->m_PosX = m_PosX;
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obj->m_PosY = m_PosY;
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return obj;
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}
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CPDF_PageObject::Type CPDF_TextObject::GetType() const {
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return TEXT;
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}
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void CPDF_TextObject::Transform(const CFX_Matrix& matrix) {
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m_TextState.GetModify();
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CFX_Matrix text_matrix;
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GetTextMatrix(&text_matrix);
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text_matrix.Concat(matrix);
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FX_FLOAT* pTextMatrix = m_TextState.GetMatrix();
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pTextMatrix[0] = text_matrix.GetA();
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pTextMatrix[1] = text_matrix.GetC();
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pTextMatrix[2] = text_matrix.GetB();
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pTextMatrix[3] = text_matrix.GetD();
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m_PosX = text_matrix.GetE();
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m_PosY = text_matrix.GetF();
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CalcPositionData(nullptr, nullptr, 0);
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}
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bool CPDF_TextObject::IsText() const {
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return true;
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}
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CPDF_TextObject* CPDF_TextObject::AsText() {
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return this;
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}
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const CPDF_TextObject* CPDF_TextObject::AsText() const {
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return this;
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}
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void CPDF_TextObject::GetTextMatrix(CFX_Matrix* pMatrix) const {
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FX_FLOAT* pTextMatrix = m_TextState.GetMatrix();
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pMatrix->Set(pTextMatrix[0], pTextMatrix[2], pTextMatrix[1], pTextMatrix[3],
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m_PosX, m_PosY);
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}
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void CPDF_TextObject::SetSegments(const CFX_ByteString* pStrs,
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FX_FLOAT* pKerning,
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int nsegs) {
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if (m_nChars > 1) {
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FX_Free(m_pCharCodes);
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m_pCharCodes = nullptr;
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}
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FX_Free(m_pCharPos);
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m_pCharPos = nullptr;
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CPDF_Font* pFont = m_TextState.GetFont();
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m_nChars = 0;
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for (int i = 0; i < nsegs; ++i) {
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m_nChars += pFont->CountChar(pStrs[i].c_str(), pStrs[i].GetLength());
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}
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m_nChars += nsegs - 1;
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if (m_nChars > 1) {
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m_pCharCodes = FX_Alloc(uint32_t, m_nChars);
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m_pCharPos = FX_Alloc(FX_FLOAT, m_nChars - 1);
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int index = 0;
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for (int i = 0; i < nsegs; ++i) {
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const FX_CHAR* segment = pStrs[i].c_str();
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int len = pStrs[i].GetLength();
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int offset = 0;
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while (offset < len) {
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m_pCharCodes[index++] = pFont->GetNextChar(segment, len, offset);
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}
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if (i != nsegs - 1) {
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m_pCharPos[index - 1] = pKerning[i];
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m_pCharCodes[index++] = CPDF_Font::kInvalidCharCode;
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}
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}
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} else {
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int offset = 0;
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m_pCharCodes = (uint32_t*)(uintptr_t)pFont->GetNextChar(
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pStrs[0].c_str(), pStrs[0].GetLength(), offset);
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}
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}
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void CPDF_TextObject::SetText(const CFX_ByteString& str) {
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SetSegments(&str, nullptr, 1);
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RecalcPositionData();
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}
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FX_FLOAT CPDF_TextObject::GetCharWidth(uint32_t charcode) const {
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FX_FLOAT fontsize = m_TextState.GetFontSize() / 1000;
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CPDF_Font* pFont = m_TextState.GetFont();
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FX_BOOL bVertWriting = FALSE;
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CPDF_CIDFont* pCIDFont = pFont->AsCIDFont();
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if (pCIDFont) {
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bVertWriting = pCIDFont->IsVertWriting();
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}
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if (!bVertWriting)
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return pFont->GetCharWidthF(charcode, 0) * fontsize;
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uint16_t CID = pCIDFont->CIDFromCharCode(charcode);
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return pCIDFont->GetVertWidth(CID) * fontsize;
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}
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FX_FLOAT CPDF_TextObject::GetPosX() const {
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return m_PosX;
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}
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FX_FLOAT CPDF_TextObject::GetPosY() const {
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return m_PosY;
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}
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CPDF_Font* CPDF_TextObject::GetFont() const {
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return m_TextState.GetFont();
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}
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FX_FLOAT CPDF_TextObject::GetFontSize() const {
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return m_TextState.GetFontSize();
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}
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void CPDF_TextObject::CalcPositionData(FX_FLOAT* pTextAdvanceX,
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FX_FLOAT* pTextAdvanceY,
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FX_FLOAT horz_scale,
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int level) {
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FX_FLOAT curpos = 0;
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FX_FLOAT min_x = 10000 * 1.0f;
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FX_FLOAT max_x = -10000 * 1.0f;
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FX_FLOAT min_y = 10000 * 1.0f;
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FX_FLOAT max_y = -10000 * 1.0f;
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CPDF_Font* pFont = m_TextState.GetFont();
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FX_BOOL bVertWriting = FALSE;
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CPDF_CIDFont* pCIDFont = pFont->AsCIDFont();
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if (pCIDFont) {
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bVertWriting = pCIDFont->IsVertWriting();
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}
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FX_FLOAT fontsize = m_TextState.GetFontSize();
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for (int i = 0; i < m_nChars; ++i) {
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uint32_t charcode =
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m_nChars == 1 ? (uint32_t)(uintptr_t)m_pCharCodes : m_pCharCodes[i];
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if (i > 0) {
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if (charcode == CPDF_Font::kInvalidCharCode) {
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curpos -= (m_pCharPos[i - 1] * fontsize) / 1000;
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continue;
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}
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m_pCharPos[i - 1] = curpos;
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}
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FX_RECT char_rect = pFont->GetCharBBox(charcode, level);
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FX_FLOAT charwidth;
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if (!bVertWriting) {
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if (min_y > char_rect.top) {
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min_y = (FX_FLOAT)char_rect.top;
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}
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if (max_y < char_rect.top) {
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max_y = (FX_FLOAT)char_rect.top;
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}
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if (min_y > char_rect.bottom) {
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min_y = (FX_FLOAT)char_rect.bottom;
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}
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if (max_y < char_rect.bottom) {
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max_y = (FX_FLOAT)char_rect.bottom;
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}
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FX_FLOAT char_left = curpos + char_rect.left * fontsize / 1000;
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FX_FLOAT char_right = curpos + char_rect.right * fontsize / 1000;
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if (min_x > char_left) {
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min_x = char_left;
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}
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if (max_x < char_left) {
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max_x = char_left;
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}
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if (min_x > char_right) {
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min_x = char_right;
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}
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if (max_x < char_right) {
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max_x = char_right;
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}
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charwidth = pFont->GetCharWidthF(charcode, level) * fontsize / 1000;
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} else {
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uint16_t CID = pCIDFont->CIDFromCharCode(charcode);
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short vx;
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short vy;
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pCIDFont->GetVertOrigin(CID, vx, vy);
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char_rect.left -= vx;
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char_rect.right -= vx;
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char_rect.top -= vy;
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char_rect.bottom -= vy;
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if (min_x > char_rect.left) {
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min_x = (FX_FLOAT)char_rect.left;
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}
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if (max_x < char_rect.left) {
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max_x = (FX_FLOAT)char_rect.left;
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}
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if (min_x > char_rect.right) {
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min_x = (FX_FLOAT)char_rect.right;
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}
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if (max_x < char_rect.right) {
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max_x = (FX_FLOAT)char_rect.right;
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}
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FX_FLOAT char_top = curpos + char_rect.top * fontsize / 1000;
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FX_FLOAT char_bottom = curpos + char_rect.bottom * fontsize / 1000;
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if (min_y > char_top) {
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min_y = char_top;
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}
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if (max_y < char_top) {
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max_y = char_top;
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}
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if (min_y > char_bottom) {
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min_y = char_bottom;
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}
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if (max_y < char_bottom) {
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max_y = char_bottom;
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}
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charwidth = pCIDFont->GetVertWidth(CID) * fontsize / 1000;
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}
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curpos += charwidth;
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if (charcode == ' ' && (!pCIDFont || pCIDFont->GetCharSize(32) == 1)) {
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curpos += m_TextState.GetObject()->m_WordSpace;
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}
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curpos += m_TextState.GetObject()->m_CharSpace;
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}
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if (bVertWriting) {
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if (pTextAdvanceX) {
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*pTextAdvanceX = 0;
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}
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if (pTextAdvanceY) {
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*pTextAdvanceY = curpos;
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}
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min_x = min_x * fontsize / 1000;
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max_x = max_x * fontsize / 1000;
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} else {
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if (pTextAdvanceX) {
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*pTextAdvanceX = curpos * horz_scale;
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}
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if (pTextAdvanceY) {
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*pTextAdvanceY = 0;
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}
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min_y = min_y * fontsize / 1000;
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max_y = max_y * fontsize / 1000;
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}
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CFX_Matrix matrix;
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GetTextMatrix(&matrix);
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m_Left = min_x;
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m_Right = max_x;
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m_Bottom = min_y;
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m_Top = max_y;
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matrix.TransformRect(m_Left, m_Right, m_Top, m_Bottom);
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if (TextRenderingModeIsStrokeMode(m_TextState.GetObject()->m_TextMode)) {
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FX_FLOAT half_width = m_GraphState.GetObject()->m_LineWidth / 2;
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m_Left -= half_width;
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m_Right += half_width;
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m_Top += half_width;
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m_Bottom -= half_width;
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}
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}
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void CPDF_TextObject::SetPosition(FX_FLOAT x, FX_FLOAT y) {
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FX_FLOAT dx = x - m_PosX;
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FX_FLOAT dy = y - m_PosY;
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m_PosX = x;
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m_PosY = y;
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m_Left += dx;
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m_Right += dx;
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m_Top += dy;
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m_Bottom += dy;
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}
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void CPDF_TextObject::RecalcPositionData() {
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CalcPositionData(nullptr, nullptr, 1);
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}
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