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// Copyright 2014 The PDFium Authors
// 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 "xfa/fde/cfde_textout.h"
#include <algorithm>
#include <utility>
#include "build/build_config.h"
#include "core/fxcrt/fx_coordinates.h"
#include "core/fxcrt/fx_extension.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/stl_util.h"
#include "core/fxge/cfx_font.h"
#include "core/fxge/cfx_path.h"
#include "core/fxge/cfx_renderdevice.h"
#include "core/fxge/cfx_substfont.h"
#include "core/fxge/cfx_textrenderoptions.h"
#include "core/fxge/fx_font.h"
#include "core/fxge/text_char_pos.h"
#include "third_party/base/check.h"
#include "third_party/base/numerics/safe_conversions.h"
#include "xfa/fgas/font/cfgas_gefont.h"
#include "xfa/fgas/layout/cfgas_txtbreak.h"
#if defined(_SKIA_SUPPORT_) || defined(_SKIA_SUPPORT_PATHS_)
#include "core/fxge/cfx_defaultrenderdevice.h"
#endif
namespace {
bool TextAlignmentVerticallyCentered(const FDE_TextAlignment align) {
return align == FDE_TextAlignment::kCenterLeft ||
align == FDE_TextAlignment::kCenter ||
align == FDE_TextAlignment::kCenterRight;
}
bool IsTextAlignmentTop(const FDE_TextAlignment align) {
return align == FDE_TextAlignment::kTopLeft;
}
} // namespace
// static
bool CFDE_TextOut::DrawString(CFX_RenderDevice* device,
FX_ARGB color,
const RetainPtr<CFGAS_GEFont>& pFont,
pdfium::span<TextCharPos> pCharPos,
float fFontSize,
const CFX_Matrix& matrix) {
DCHECK(pFont);
DCHECK(!pCharPos.empty());
CFX_Font* pFxFont = pFont->GetDevFont();
if (FontStyleIsItalic(pFont->GetFontStyles()) && !pFxFont->IsItalic()) {
for (auto& pos : pCharPos) {
static constexpr float mc = 0.267949f;
pos.m_AdjustMatrix[2] += mc * pos.m_AdjustMatrix[0];
pos.m_AdjustMatrix[3] += mc * pos.m_AdjustMatrix[1];
}
}
#if !BUILDFLAG(IS_WIN)
uint32_t dwFontStyle = pFont->GetFontStyles();
CFX_Font FxFont;
auto SubstFxFont = std::make_unique<CFX_SubstFont>();
SubstFxFont->m_Weight = FontStyleIsForceBold(dwFontStyle) ? 700 : 400;
SubstFxFont->m_ItalicAngle = FontStyleIsItalic(dwFontStyle) ? -12 : 0;
SubstFxFont->m_WeightCJK = SubstFxFont->m_Weight;
SubstFxFont->m_bItalicCJK = FontStyleIsItalic(dwFontStyle);
FxFont.SetSubstFont(std::move(SubstFxFont));
#endif
RetainPtr<CFGAS_GEFont> pCurFont;
TextCharPos* pCurCP = nullptr;
int32_t iCurCount = 0;
static constexpr CFX_TextRenderOptions kOptions(CFX_TextRenderOptions::kLcd);
for (auto& pos : pCharPos) {
RetainPtr<CFGAS_GEFont> pSTFont =
pFont->GetSubstFont(static_cast<int32_t>(pos.m_GlyphIndex));
pos.m_GlyphIndex &= 0x00FFFFFF;
pos.m_bFontStyle = false;
if (pCurFont != pSTFont) {
if (pCurFont) {
pFxFont = pCurFont->GetDevFont();
CFX_Font* font;
#if !BUILDFLAG(IS_WIN)
FxFont.SetFace(pFxFont->GetFace());
FxFont.SetFontSpan(pFxFont->GetFontSpan());
font = &FxFont;
#else
font = pFxFont;
#endif
device->DrawNormalText(pdfium::make_span(pCurCP, iCurCount), font,
-fFontSize, matrix, color, kOptions);
}
pCurFont = pSTFont;
pCurCP = &pos;
iCurCount = 1;
} else {
++iCurCount;
}
}
bool bRet = true;
if (pCurFont && iCurCount) {
pFxFont = pCurFont->GetDevFont();
CFX_Font* font;
#if !BUILDFLAG(IS_WIN)
FxFont.SetFace(pFxFont->GetFace());
FxFont.SetFontSpan(pFxFont->GetFontSpan());
font = &FxFont;
#else
font = pFxFont;
#endif
bRet = device->DrawNormalText(pdfium::make_span(pCurCP, iCurCount), font,
-fFontSize, matrix, color, kOptions);
}
#if defined(_SKIA_SUPPORT_) || defined(_SKIA_SUPPORT_PATHS_)
if (CFX_DefaultRenderDevice::SkiaVariantIsDefaultRenderer())
device->Flush(false);
#endif
return bRet;
}
CFDE_TextOut::Piece::Piece() = default;
CFDE_TextOut::Piece::Piece(const Piece& that) = default;
CFDE_TextOut::Piece::~Piece() = default;
CFDE_TextOut::CFDE_TextOut()
: m_pTxtBreak(std::make_unique<CFGAS_TxtBreak>()), m_ttoLines(5) {}
CFDE_TextOut::~CFDE_TextOut() = default;
void CFDE_TextOut::SetFont(RetainPtr<CFGAS_GEFont> pFont) {
DCHECK(pFont);
m_pFont = std::move(pFont);
m_pTxtBreak->SetFont(m_pFont);
}
void CFDE_TextOut::SetFontSize(float fFontSize) {
DCHECK(fFontSize > 0);
m_fFontSize = fFontSize;
m_pTxtBreak->SetFontSize(fFontSize);
}
void CFDE_TextOut::SetStyles(const FDE_TextStyle& dwStyles) {
m_Styles = dwStyles;
m_dwTxtBkStyles = m_Styles.single_line_
? CFGAS_Break::LayoutStyle::kSingleLine
: CFGAS_Break::LayoutStyle::kNone;
m_pTxtBreak->SetLayoutStyles(m_dwTxtBkStyles);
}
void CFDE_TextOut::SetAlignment(FDE_TextAlignment iAlignment) {
m_iAlignment = iAlignment;
int32_t txtBreakAlignment = 0;
switch (m_iAlignment) {
case FDE_TextAlignment::kCenter:
txtBreakAlignment = CFX_TxtLineAlignment_Center;
break;
case FDE_TextAlignment::kCenterRight:
txtBreakAlignment = CFX_TxtLineAlignment_Right;
break;
case FDE_TextAlignment::kCenterLeft:
case FDE_TextAlignment::kTopLeft:
txtBreakAlignment = CFX_TxtLineAlignment_Left;
break;
}
m_pTxtBreak->SetAlignment(txtBreakAlignment);
}
void CFDE_TextOut::SetLineSpace(float fLineSpace) {
DCHECK(fLineSpace > 1.0f);
m_fLineSpace = fLineSpace;
}
void CFDE_TextOut::SetLineBreakTolerance(float fTolerance) {
m_fTolerance = fTolerance;
m_pTxtBreak->SetLineBreakTolerance(m_fTolerance);
}
void CFDE_TextOut::CalcLogicSize(WideStringView str, CFX_SizeF* pSize) {
CFX_RectF rtText(0.0f, 0.0f, pSize->width, pSize->height);
CalcLogicSize(str, &rtText);
*pSize = rtText.Size();
}
void CFDE_TextOut::CalcLogicSize(WideStringView str, CFX_RectF* pRect) {
if (str.IsEmpty()) {
pRect->width = 0.0f;
pRect->height = 0.0f;
return;
}
DCHECK(m_pFont);
DCHECK(m_fFontSize >= 1.0f);
if (!m_Styles.single_line_) {
if (pRect->Width() < 1.0f)
pRect->width = m_fFontSize * 1000.0f;
m_pTxtBreak->SetLineWidth(pRect->Width());
}
m_iTotalLines = 0;
float fWidth = 0.0f;
float fHeight = 0.0f;
float fStartPos = pRect->right();
CFGAS_Char::BreakType dwBreakStatus = CFGAS_Char::BreakType::kNone;
bool break_char_is_set = false;
for (const wchar_t& wch : str) {
if (!break_char_is_set && (wch == L'\n' || wch == L'\r')) {
break_char_is_set = true;
m_pTxtBreak->SetParagraphBreakChar(wch);
}
dwBreakStatus = m_pTxtBreak->AppendChar(wch);
if (!CFX_BreakTypeNoneOrPiece(dwBreakStatus))
RetrieveLineWidth(dwBreakStatus, &fStartPos, &fWidth, &fHeight);
}
dwBreakStatus = m_pTxtBreak->EndBreak(CFGAS_Char::BreakType::kParagraph);
if (!CFX_BreakTypeNoneOrPiece(dwBreakStatus))
RetrieveLineWidth(dwBreakStatus, &fStartPos, &fWidth, &fHeight);
m_pTxtBreak->Reset();
float fInc = pRect->Height() - fHeight;
if (TextAlignmentVerticallyCentered(m_iAlignment))
fInc /= 2.0f;
else if (IsTextAlignmentTop(m_iAlignment))
fInc = 0.0f;
pRect->left += fStartPos;
pRect->top += fInc;
pRect->width = std::min(fWidth, pRect->Width());
pRect->height = fHeight;
if (m_Styles.last_line_height_)
pRect->height -= m_fLineSpace - m_fFontSize;
}
bool CFDE_TextOut::RetrieveLineWidth(CFGAS_Char::BreakType dwBreakStatus,
float* pStartPos,
float* pWidth,
float* pHeight) {
if (CFX_BreakTypeNoneOrPiece(dwBreakStatus))
return false;
float fLineStep = std::max(m_fLineSpace, m_fFontSize);
float fLineWidth = 0.0f;
for (int32_t i = 0; i < m_pTxtBreak->CountBreakPieces(); i++) {
const CFGAS_BreakPiece* pPiece = m_pTxtBreak->GetBreakPieceUnstable(i);
fLineWidth += static_cast<float>(pPiece->GetWidth()) / 20000.0f;
*pStartPos = std::min(*pStartPos,
static_cast<float>(pPiece->GetStartPos()) / 20000.0f);
}
m_pTxtBreak->ClearBreakPieces();
if (dwBreakStatus == CFGAS_Char::BreakType::kParagraph)
m_pTxtBreak->Reset();
if (!m_Styles.line_wrap_ && dwBreakStatus == CFGAS_Char::BreakType::kLine) {
*pWidth += fLineWidth;
} else {
*pWidth = std::max(*pWidth, fLineWidth);
*pHeight += fLineStep;
}
++m_iTotalLines;
return true;
}
void CFDE_TextOut::DrawLogicText(CFX_RenderDevice* device,
const WideString& str,
const CFX_RectF& rect) {
DCHECK(m_pFont);
DCHECK(m_fFontSize >= 1.0f);
if (str.IsEmpty())
return;
if (rect.width < m_fFontSize || rect.height < m_fFontSize)
return;
float fLineWidth = rect.width;
m_pTxtBreak->SetLineWidth(fLineWidth);
m_ttoLines.clear();
m_wsText.clear();
LoadText(str, rect);
Reload(rect);
DoAlignment(rect);
if (!device || m_ttoLines.empty())
return;
CFX_RectF rtClip = m_Matrix.TransformRect(CFX_RectF());
device->SaveState();
if (rtClip.Width() > 0.0f && rtClip.Height() > 0.0f)
device->SetClip_Rect(rtClip.GetOuterRect());
for (auto& line : m_ttoLines) {
for (size_t i = 0; i < line.GetSize(); ++i) {
const Piece* pPiece = line.GetPieceAtIndex(i);
size_t szCount = GetDisplayPos(pPiece);
if (szCount == 0)
continue;
CFDE_TextOut::DrawString(device, m_TxtColor, m_pFont,
{m_CharPos.data(), szCount}, m_fFontSize,
m_Matrix);
}
}
device->RestoreState(false);
}
void CFDE_TextOut::LoadText(const WideString& str, const CFX_RectF& rect) {
DCHECK(!str.IsEmpty());
m_wsText = str;
if (m_CharWidths.size() < str.GetLength())
m_CharWidths.resize(str.GetLength(), 0);
float fLineStep = std::max(m_fLineSpace, m_fFontSize);
float fLineStop = rect.bottom();
m_fLinePos = rect.top;
size_t start_char = 0;
int32_t iPieceWidths = 0;
CFGAS_Char::BreakType dwBreakStatus;
bool bRet = false;
for (const auto& wch : str) {
dwBreakStatus = m_pTxtBreak->AppendChar(wch);
if (CFX_BreakTypeNoneOrPiece(dwBreakStatus))
continue;
bool bEndofLine =
RetrievePieces(dwBreakStatus, false, rect, &start_char, &iPieceWidths);
if (bEndofLine && (m_Styles.line_wrap_ ||
dwBreakStatus == CFGAS_Char::BreakType::kParagraph ||
dwBreakStatus == CFGAS_Char::BreakType::kPage)) {
iPieceWidths = 0;
++m_iCurLine;
m_fLinePos += fLineStep;
}
if (m_fLinePos + fLineStep > fLineStop) {
size_t iCurLine = bEndofLine ? m_iCurLine - 1 : m_iCurLine;
m_ttoLines[iCurLine].set_new_reload(true);
bRet = true;
break;
}
}
dwBreakStatus = m_pTxtBreak->EndBreak(CFGAS_Char::BreakType::kParagraph);
if (!CFX_BreakTypeNoneOrPiece(dwBreakStatus) && !bRet)
RetrievePieces(dwBreakStatus, false, rect, &start_char, &iPieceWidths);
m_pTxtBreak->ClearBreakPieces();
m_pTxtBreak->Reset();
}
bool CFDE_TextOut::RetrievePieces(CFGAS_Char::BreakType dwBreakStatus,
bool bReload,
const CFX_RectF& rect,
size_t* pStartChar,
int32_t* pPieceWidths) {
float fLineStep = std::max(m_fLineSpace, m_fFontSize);
bool bNeedReload = false;
int32_t iLineWidth = FXSYS_roundf(rect.Width() * 20000.0f);
int32_t iCount = m_pTxtBreak->CountBreakPieces();
size_t chars_to_skip = *pStartChar;
for (int32_t i = 0; i < iCount; i++) {
const CFGAS_BreakPiece* pPiece = m_pTxtBreak->GetBreakPieceUnstable(i);
size_t iPieceChars = pPiece->GetLength();
if (chars_to_skip > iPieceChars) {
chars_to_skip -= iPieceChars;
continue;
}
size_t iChar = *pStartChar;
int32_t iWidth = 0;
size_t j = chars_to_skip;
for (; j < iPieceChars; j++) {
const CFGAS_Char* pTC = pPiece->GetChar(j);
int32_t iCurCharWidth = std::max(pTC->m_iCharWidth, 0);
if (m_Styles.single_line_ || !m_Styles.line_wrap_) {
if (iLineWidth - *pPieceWidths - iWidth < iCurCharWidth) {
bNeedReload = true;
break;
}
}
iWidth += iCurCharWidth;
m_CharWidths[iChar++] = iCurCharWidth;
}
if (j == chars_to_skip && !bReload) {
m_ttoLines[m_iCurLine].set_new_reload(true);
} else if (j > chars_to_skip) {
Piece piece;
piece.start_char = *pStartChar;
piece.char_count = j - chars_to_skip;
piece.char_styles = pPiece->GetCharStyles();
piece.bounds = CFX_RectF(
rect.left + static_cast<float>(pPiece->GetStartPos()) / 20000.0f,
m_fLinePos, iWidth / 20000.0f, fLineStep);
if (FX_IsOdd(pPiece->GetBidiLevel()))
piece.char_styles |= FX_TXTCHARSTYLE_OddBidiLevel;
AppendPiece(piece, bNeedReload, (bReload && i == iCount - 1));
}
*pStartChar += iPieceChars;
*pPieceWidths += iWidth;
}
m_pTxtBreak->ClearBreakPieces();
return m_Styles.single_line_ || m_Styles.line_wrap_ || bNeedReload ||
dwBreakStatus == CFGAS_Char::BreakType::kParagraph;
}
void CFDE_TextOut::AppendPiece(const Piece& piece,
bool bNeedReload,
bool bEnd) {
if (m_iCurLine >= m_ttoLines.size()) {
Line ttoLine;
ttoLine.set_new_reload(bNeedReload);
m_iCurPiece = ttoLine.AddPiece(m_iCurPiece, piece);
m_ttoLines.push_back(ttoLine);
m_iCurLine = m_ttoLines.size() - 1;
} else {
Line* pLine = &m_ttoLines[m_iCurLine];
pLine->set_new_reload(bNeedReload);
m_iCurPiece = pLine->AddPiece(m_iCurPiece, piece);
if (bEnd) {
size_t iPieces = pLine->GetSize();
if (m_iCurPiece < iPieces)
pLine->RemoveLast(iPieces - m_iCurPiece - 1);
}
}
if (!bEnd && bNeedReload)
m_iCurPiece = 0;
}
void CFDE_TextOut::Reload(const CFX_RectF& rect) {
size_t i = 0;
for (auto& line : m_ttoLines) {
if (line.new_reload()) {
m_iCurLine = i;
m_iCurPiece = 0;
ReloadLinePiece(&line, rect);
}
++i;
}
}
void CFDE_TextOut::ReloadLinePiece(Line* line, const CFX_RectF& rect) {
pdfium::span<const wchar_t> text_span = m_wsText.span();
size_t start_char = 0;
size_t piece_count = line->GetSize();
int32_t piece_widths = 0;
CFGAS_Char::BreakType break_status = CFGAS_Char::BreakType::kNone;
for (size_t piece_index = 0; piece_index < piece_count; ++piece_index) {
const Piece* piece = line->GetPieceAtIndex(piece_index);
if (piece_index == 0)
m_fLinePos = piece->bounds.top;
start_char = piece->start_char;
const size_t end = piece->start_char + piece->char_count;
for (size_t char_index = start_char; char_index < end; ++char_index) {
break_status = m_pTxtBreak->AppendChar(text_span[char_index]);
if (!CFX_BreakTypeNoneOrPiece(break_status))
RetrievePieces(break_status, true, rect, &start_char, &piece_widths);
}
}
break_status = m_pTxtBreak->EndBreak(CFGAS_Char::BreakType::kParagraph);
if (!CFX_BreakTypeNoneOrPiece(break_status))
RetrievePieces(break_status, true, rect, &start_char, &piece_widths);
m_pTxtBreak->Reset();
}
void CFDE_TextOut::DoAlignment(const CFX_RectF& rect) {
if (m_ttoLines.empty())
return;
const Piece* pFirstPiece = m_ttoLines.back().GetPieceAtIndex(0);
if (!pFirstPiece)
return;
float fInc = rect.bottom() - pFirstPiece->bounds.bottom();
if (TextAlignmentVerticallyCentered(m_iAlignment))
fInc /= 2.0f;
else if (IsTextAlignmentTop(m_iAlignment))
fInc = 0.0f;
if (fInc < 1.0f)
return;
for (auto& line : m_ttoLines) {
for (size_t i = 0; i < line.GetSize(); ++i)
line.GetPieceAtIndex(i)->bounds.top += fInc;
}
}
size_t CFDE_TextOut::GetDisplayPos(const Piece* pPiece) {
if (m_CharPos.size() < pPiece->char_count)
m_CharPos.resize(pPiece->char_count, TextCharPos());
CFGAS_TxtBreak::Run tr;
tr.wsStr = m_wsText.Substr(pPiece->start_char);
tr.pWidths = &m_CharWidths[pPiece->start_char];
tr.iLength = pdfium::base::checked_cast<int32_t>(pPiece->char_count);
tr.pFont = m_pFont;
tr.fFontSize = m_fFontSize;
tr.dwStyles = m_dwTxtBkStyles;
tr.dwCharStyles = pPiece->char_styles;
tr.pRect = &pPiece->bounds;
return m_pTxtBreak->GetDisplayPos(tr, m_CharPos.data());
}
CFDE_TextOut::Line::Line() = default;
CFDE_TextOut::Line::Line(const Line& that)
: new_reload_(that.new_reload_), pieces_(that.pieces_) {}
CFDE_TextOut::Line::~Line() = default;
size_t CFDE_TextOut::Line::AddPiece(size_t index, const Piece& piece) {
if (index >= pieces_.size()) {
pieces_.push_back(piece);
return pieces_.size();
}
pieces_[index] = piece;
return index;
}
size_t CFDE_TextOut::Line::GetSize() const {
return pieces_.size();
}
const CFDE_TextOut::Piece* CFDE_TextOut::Line::GetPieceAtIndex(
size_t index) const {
CHECK(fxcrt::IndexInBounds(pieces_, index));
return &pieces_[index];
}
CFDE_TextOut::Piece* CFDE_TextOut::Line::GetPieceAtIndex(size_t index) {
CHECK(fxcrt::IndexInBounds(pieces_, index));
return &pieces_[index];
}
void CFDE_TextOut::Line::RemoveLast(size_t count) {
pieces_.erase(pieces_.end() - std::min(count, pieces_.size()), pieces_.end());
}