diff options
Diffstat (limited to 'core/fpdfapi/page/cpdf_textobject.cpp')
| -rw-r--r-- | core/fpdfapi/page/cpdf_textobject.cpp | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/core/fpdfapi/page/cpdf_textobject.cpp b/core/fpdfapi/page/cpdf_textobject.cpp new file mode 100644 index 0000000000..0b44522835 --- /dev/null +++ b/core/fpdfapi/page/cpdf_textobject.cpp @@ -0,0 +1,388 @@ +// 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/page/cpdf_textobject.h" + +#include "core/fpdfapi/font/cpdf_cidfont.h" +#include "core/fpdfapi/font/cpdf_font.h" + +CPDF_TextObject::CPDF_TextObject() + : m_PosX(0), + m_PosY(0), + m_nChars(0), + m_pCharCodes(nullptr), + m_pCharPos(nullptr) {} + +CPDF_TextObject::~CPDF_TextObject() { + if (m_nChars > 1) { + FX_Free(m_pCharCodes); + } + FX_Free(m_pCharPos); +} + +int CPDF_TextObject::CountItems() const { + return m_nChars; +} + +void CPDF_TextObject::GetItemInfo(int index, CPDF_TextObjectItem* pInfo) const { + pInfo->m_CharCode = + m_nChars == 1 ? (uint32_t)(uintptr_t)m_pCharCodes : m_pCharCodes[index]; + pInfo->m_OriginX = index ? m_pCharPos[index - 1] : 0; + pInfo->m_OriginY = 0; + if (pInfo->m_CharCode == CPDF_Font::kInvalidCharCode) { + return; + } + CPDF_Font* pFont = m_TextState.GetFont(); + if (!pFont->IsCIDFont()) { + return; + } + if (!pFont->AsCIDFont()->IsVertWriting()) { + return; + } + uint16_t CID = pFont->AsCIDFont()->CIDFromCharCode(pInfo->m_CharCode); + pInfo->m_OriginY = pInfo->m_OriginX; + pInfo->m_OriginX = 0; + short vx, vy; + pFont->AsCIDFont()->GetVertOrigin(CID, vx, vy); + FX_FLOAT fontsize = m_TextState.GetFontSize(); + pInfo->m_OriginX -= fontsize * vx / 1000; + pInfo->m_OriginY -= fontsize * vy / 1000; +} + +int CPDF_TextObject::CountChars() const { + if (m_nChars == 1) { + return 1; + } + int count = 0; + for (int i = 0; i < m_nChars; ++i) + if (m_pCharCodes[i] != CPDF_Font::kInvalidCharCode) { + ++count; + } + return count; +} + +void CPDF_TextObject::GetCharInfo(int index, + uint32_t& charcode, + FX_FLOAT& kerning) const { + if (m_nChars == 1) { + charcode = (uint32_t)(uintptr_t)m_pCharCodes; + kerning = 0; + return; + } + int count = 0; + for (int i = 0; i < m_nChars; ++i) { + if (m_pCharCodes[i] != CPDF_Font::kInvalidCharCode) { + if (count == index) { + charcode = m_pCharCodes[i]; + if (i == m_nChars - 1 || + m_pCharCodes[i + 1] != CPDF_Font::kInvalidCharCode) { + kerning = 0; + } else { + kerning = m_pCharPos[i]; + } + return; + } + ++count; + } + } +} + +void CPDF_TextObject::GetCharInfo(int index, CPDF_TextObjectItem* pInfo) const { + if (m_nChars == 1) { + GetItemInfo(0, pInfo); + return; + } + int count = 0; + for (int i = 0; i < m_nChars; ++i) { + uint32_t charcode = m_pCharCodes[i]; + if (charcode == CPDF_Font::kInvalidCharCode) { + continue; + } + if (count == index) { + GetItemInfo(i, pInfo); + break; + } + ++count; + } +} + +CPDF_TextObject* CPDF_TextObject::Clone() const { + CPDF_TextObject* obj = new CPDF_TextObject; + obj->CopyData(this); + + obj->m_nChars = m_nChars; + if (m_nChars > 1) { + obj->m_pCharCodes = FX_Alloc(uint32_t, m_nChars); + FXSYS_memcpy(obj->m_pCharCodes, m_pCharCodes, m_nChars * sizeof(uint32_t)); + obj->m_pCharPos = FX_Alloc(FX_FLOAT, m_nChars - 1); + FXSYS_memcpy(obj->m_pCharPos, m_pCharPos, + (m_nChars - 1) * sizeof(FX_FLOAT)); + } else { + obj->m_pCharCodes = m_pCharCodes; + } + obj->m_PosX = m_PosX; + obj->m_PosY = m_PosY; + return obj; +} + +CPDF_PageObject::Type CPDF_TextObject::GetType() const { + return TEXT; +} + +void CPDF_TextObject::Transform(const CFX_Matrix& matrix) { + CFX_Matrix text_matrix; + GetTextMatrix(&text_matrix); + text_matrix.Concat(matrix); + + FX_FLOAT* pTextMatrix = m_TextState.GetMutableMatrix(); + pTextMatrix[0] = text_matrix.GetA(); + pTextMatrix[1] = text_matrix.GetC(); + pTextMatrix[2] = text_matrix.GetB(); + pTextMatrix[3] = text_matrix.GetD(); + m_PosX = text_matrix.GetE(); + m_PosY = text_matrix.GetF(); + CalcPositionData(nullptr, nullptr, 0); +} + +bool CPDF_TextObject::IsText() const { + return true; +} + +CPDF_TextObject* CPDF_TextObject::AsText() { + return this; +} + +const CPDF_TextObject* CPDF_TextObject::AsText() const { + return this; +} + +void CPDF_TextObject::GetTextMatrix(CFX_Matrix* pMatrix) const { + const FX_FLOAT* pTextMatrix = m_TextState.GetMatrix(); + pMatrix->Set(pTextMatrix[0], pTextMatrix[2], pTextMatrix[1], pTextMatrix[3], + m_PosX, m_PosY); +} + +void CPDF_TextObject::SetSegments(const CFX_ByteString* pStrs, + FX_FLOAT* pKerning, + int nsegs) { + if (m_nChars > 1) { + FX_Free(m_pCharCodes); + m_pCharCodes = nullptr; + } + FX_Free(m_pCharPos); + m_pCharPos = nullptr; + CPDF_Font* pFont = m_TextState.GetFont(); + m_nChars = 0; + for (int i = 0; i < nsegs; ++i) { + m_nChars += pFont->CountChar(pStrs[i].c_str(), pStrs[i].GetLength()); + } + m_nChars += nsegs - 1; + if (m_nChars > 1) { + m_pCharCodes = FX_Alloc(uint32_t, m_nChars); + m_pCharPos = FX_Alloc(FX_FLOAT, m_nChars - 1); + int index = 0; + for (int i = 0; i < nsegs; ++i) { + const FX_CHAR* segment = pStrs[i].c_str(); + int len = pStrs[i].GetLength(); + int offset = 0; + while (offset < len) { + m_pCharCodes[index++] = pFont->GetNextChar(segment, len, offset); + } + if (i != nsegs - 1) { + m_pCharPos[index - 1] = pKerning[i]; + m_pCharCodes[index++] = CPDF_Font::kInvalidCharCode; + } + } + } else { + int offset = 0; + m_pCharCodes = (uint32_t*)(uintptr_t)pFont->GetNextChar( + pStrs[0].c_str(), pStrs[0].GetLength(), offset); + } +} + +void CPDF_TextObject::SetText(const CFX_ByteString& str) { + SetSegments(&str, nullptr, 1); + RecalcPositionData(); +} + +FX_FLOAT CPDF_TextObject::GetCharWidth(uint32_t charcode) const { + FX_FLOAT fontsize = m_TextState.GetFontSize() / 1000; + CPDF_Font* pFont = m_TextState.GetFont(); + FX_BOOL bVertWriting = FALSE; + CPDF_CIDFont* pCIDFont = pFont->AsCIDFont(); + if (pCIDFont) { + bVertWriting = pCIDFont->IsVertWriting(); + } + if (!bVertWriting) + return pFont->GetCharWidthF(charcode) * fontsize; + + uint16_t CID = pCIDFont->CIDFromCharCode(charcode); + return pCIDFont->GetVertWidth(CID) * fontsize; +} + +FX_FLOAT CPDF_TextObject::GetPosX() const { + return m_PosX; +} + +FX_FLOAT CPDF_TextObject::GetPosY() const { + return m_PosY; +} + +CPDF_Font* CPDF_TextObject::GetFont() const { + return m_TextState.GetFont(); +} + +FX_FLOAT CPDF_TextObject::GetFontSize() const { + return m_TextState.GetFontSize(); +} + +void CPDF_TextObject::CalcPositionData(FX_FLOAT* pTextAdvanceX, + FX_FLOAT* pTextAdvanceY, + FX_FLOAT horz_scale) { + FX_FLOAT curpos = 0; + FX_FLOAT min_x = 10000 * 1.0f; + FX_FLOAT max_x = -10000 * 1.0f; + FX_FLOAT min_y = 10000 * 1.0f; + FX_FLOAT max_y = -10000 * 1.0f; + CPDF_Font* pFont = m_TextState.GetFont(); + FX_BOOL bVertWriting = FALSE; + CPDF_CIDFont* pCIDFont = pFont->AsCIDFont(); + if (pCIDFont) { + bVertWriting = pCIDFont->IsVertWriting(); + } + FX_FLOAT fontsize = m_TextState.GetFontSize(); + for (int i = 0; i < m_nChars; ++i) { + uint32_t charcode = + m_nChars == 1 ? (uint32_t)(uintptr_t)m_pCharCodes : m_pCharCodes[i]; + if (i > 0) { + if (charcode == CPDF_Font::kInvalidCharCode) { + curpos -= (m_pCharPos[i - 1] * fontsize) / 1000; + continue; + } + m_pCharPos[i - 1] = curpos; + } + FX_RECT char_rect = pFont->GetCharBBox(charcode); + FX_FLOAT charwidth; + if (!bVertWriting) { + if (min_y > char_rect.top) { + min_y = (FX_FLOAT)char_rect.top; + } + if (max_y < char_rect.top) { + max_y = (FX_FLOAT)char_rect.top; + } + if (min_y > char_rect.bottom) { + min_y = (FX_FLOAT)char_rect.bottom; + } + if (max_y < char_rect.bottom) { + max_y = (FX_FLOAT)char_rect.bottom; + } + FX_FLOAT char_left = curpos + char_rect.left * fontsize / 1000; + FX_FLOAT char_right = curpos + char_rect.right * fontsize / 1000; + if (min_x > char_left) { + min_x = char_left; + } + if (max_x < char_left) { + max_x = char_left; + } + if (min_x > char_right) { + min_x = char_right; + } + if (max_x < char_right) { + max_x = char_right; + } + charwidth = pFont->GetCharWidthF(charcode) * fontsize / 1000; + } else { + uint16_t CID = pCIDFont->CIDFromCharCode(charcode); + short vx; + short vy; + pCIDFont->GetVertOrigin(CID, vx, vy); + char_rect.left -= vx; + char_rect.right -= vx; + char_rect.top -= vy; + char_rect.bottom -= vy; + if (min_x > char_rect.left) { + min_x = (FX_FLOAT)char_rect.left; + } + if (max_x < char_rect.left) { + max_x = (FX_FLOAT)char_rect.left; + } + if (min_x > char_rect.right) { + min_x = (FX_FLOAT)char_rect.right; + } + if (max_x < char_rect.right) { + max_x = (FX_FLOAT)char_rect.right; + } + FX_FLOAT char_top = curpos + char_rect.top * fontsize / 1000; + FX_FLOAT char_bottom = curpos + char_rect.bottom * fontsize / 1000; + if (min_y > char_top) { + min_y = char_top; + } + if (max_y < char_top) { + max_y = char_top; + } + if (min_y > char_bottom) { + min_y = char_bottom; + } + if (max_y < char_bottom) { + max_y = char_bottom; + } + charwidth = pCIDFont->GetVertWidth(CID) * fontsize / 1000; + } + curpos += charwidth; + if (charcode == ' ' && (!pCIDFont || pCIDFont->GetCharSize(32) == 1)) { + curpos += m_TextState.GetWordSpace(); + } + curpos += m_TextState.GetCharSpace(); + } + if (bVertWriting) { + if (pTextAdvanceX) { + *pTextAdvanceX = 0; + } + if (pTextAdvanceY) { + *pTextAdvanceY = curpos; + } + min_x = min_x * fontsize / 1000; + max_x = max_x * fontsize / 1000; + } else { + if (pTextAdvanceX) { + *pTextAdvanceX = curpos * horz_scale; + } + if (pTextAdvanceY) { + *pTextAdvanceY = 0; + } + min_y = min_y * fontsize / 1000; + max_y = max_y * fontsize / 1000; + } + CFX_Matrix matrix; + GetTextMatrix(&matrix); + m_Left = min_x; + m_Right = max_x; + m_Bottom = min_y; + m_Top = max_y; + matrix.TransformRect(m_Left, m_Right, m_Top, m_Bottom); + if (TextRenderingModeIsStrokeMode(m_TextState.GetTextMode())) { + FX_FLOAT half_width = m_GraphState.GetLineWidth() / 2; + m_Left -= half_width; + m_Right += half_width; + m_Top += half_width; + m_Bottom -= half_width; + } +} + +void CPDF_TextObject::SetPosition(FX_FLOAT x, FX_FLOAT y) { + FX_FLOAT dx = x - m_PosX; + FX_FLOAT dy = y - m_PosY; + m_PosX = x; + m_PosY = y; + m_Left += dx; + m_Right += dx; + m_Top += dy; + m_Bottom += dy; +} + +void CPDF_TextObject::RecalcPositionData() { + CalcPositionData(nullptr, nullptr, 1); +} |