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lib_ui/ui/text/text_renderer.cpp
John Preston 3752e158e4 Fix spoilers with multi-item elision blocks.
2022-11-09 12:35:04 +04:00

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// This file is part of Desktop App Toolkit,
// a set of libraries for developing nice desktop applications.
//
// For license and copyright information please follow this link:
// https://github.com/desktop-app/legal/blob/master/LEGAL
//
#include "ui/text/text_renderer.h"
#include "ui/text/text_spoiler_data.h"
#include "styles/style_basic.h"
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
#include <private/qharfbuzz_p.h>
#endif // Qt < 6.0.0
namespace Ui::Text {
namespace {
// COPIED FROM qtextengine.cpp AND MODIFIED
struct BidiStatus {
BidiStatus() {
eor = QChar::DirON;
lastStrong = QChar::DirON;
last = QChar::DirON;
dir = QChar::DirON;
}
QChar::Direction eor;
QChar::Direction lastStrong;
QChar::Direction last;
QChar::Direction dir;
};
enum { _MaxBidiLevel = 61 };
enum { _MaxItemLength = 4096 };
void InitTextItemWithScriptItem(QTextItemInt &ti, const QScriptItem &si) {
// explicitly initialize flags so that initFontAttributes can be called
// multiple times on the same TextItem
ti.flags = { };
if (si.analysis.bidiLevel % 2)
ti.flags |= QTextItem::RightToLeft;
ti.ascent = si.ascent;
ti.descent = si.descent;
if (ti.charFormat.hasProperty(QTextFormat::TextUnderlineStyle)) {
ti.underlineStyle = ti.charFormat.underlineStyle();
} else if (ti.charFormat.boolProperty(QTextFormat::FontUnderline)
|| ti.f->underline()) {
ti.underlineStyle = QTextCharFormat::SingleUnderline;
}
// compat
if (ti.underlineStyle == QTextCharFormat::SingleUnderline)
ti.flags |= QTextItem::Underline;
if (ti.f->overline() || ti.charFormat.fontOverline())
ti.flags |= QTextItem::Overline;
if (ti.f->strikeOut() || ti.charFormat.fontStrikeOut())
ti.flags |= QTextItem::StrikeOut;
}
void AppendRange(
QVarLengthArray<FixedRange> &ranges,
FixedRange range) {
for (auto i = ranges.begin(); i != ranges.end(); ++i) {
if (range.till < i->from) {
ranges.insert(i, range);
return;
} else if (!Distinct(range, *i)) {
*i = United(*i, range);
for (auto j = i + 1; j != ranges.end(); ++j) {
if (j->from > i->till) {
ranges.erase(i + 1, j);
return;
} else {
*i = United(*i, *j);
}
}
ranges.erase(i + 1, ranges.end());
return;
}
}
ranges.push_back(range);
}
} // namespace
struct Renderer::BidiControl {
inline BidiControl(bool rtl)
: base(rtl ? 1 : 0), level(rtl ? 1 : 0) {}
inline void embed(bool rtl, bool o = false) {
unsigned int toAdd = 1;
if ((level % 2 != 0) == rtl) {
++toAdd;
}
if (level + toAdd <= _MaxBidiLevel) {
ctx[cCtx].level = level;
ctx[cCtx].override = override;
cCtx++;
override = o;
level += toAdd;
}
}
inline bool canPop() const { return cCtx != 0; }
inline void pdf() {
Q_ASSERT(cCtx);
--cCtx;
level = ctx[cCtx].level;
override = ctx[cCtx].override;
}
inline QChar::Direction basicDirection() const {
return (base ? QChar::DirR : QChar::DirL);
}
inline unsigned int baseLevel() const {
return base;
}
inline QChar::Direction direction() const {
return ((level % 2) ? QChar::DirR : QChar::DirL);
}
struct {
unsigned int level = 0;
bool override = false;
} ctx[_MaxBidiLevel];
unsigned int cCtx = 0;
const unsigned int base;
unsigned int level;
bool override = false;
};
FixedRange Intersected(FixedRange a, FixedRange b) {
return {
.from = std::max(a.from, b.from),
.till = std::min(a.till, b.till),
};
}
bool Intersects(FixedRange a, FixedRange b) {
return (a.till > b.from) && (b.till > a.from);
}
FixedRange United(FixedRange a, FixedRange b) {
return {
.from = std::min(a.from, b.from),
.till = std::max(a.till, b.till),
};
}
bool Distinct(FixedRange a, FixedRange b) {
return (a.till < b.from) || (b.till < a.from);
}
Renderer::Renderer(const Ui::Text::String &t)
: _t(&t)
, _spoiler(_t->_spoiler.data.get()) {
}
Renderer::~Renderer() {
restoreAfterElided();
if (_p) {
_p->setPen(_originalPen);
}
}
void Renderer::draw(QPainter &p, const PaintContext &context) {
if (_t->isEmpty()) {
return;
}
_p = &p;
_p->setFont(_t->_st->font);
_palette = context.palette ? context.palette : &st::defaultTextPalette;
_originalPen = _p->pen();
_originalPenSelected = (_palette->selectFg->c.alphaF() == 0)
? _originalPen
: _palette->selectFg->p;
_x = context.position.x();
_y = context.position.y();
_yFrom = context.clip.isNull() ? 0 : context.clip.y();
_yTo = context.clip.isNull()
? -1
: (context.clip.y() + context.clip.height());
if (const auto lines = context.elisionLines) {
if (_yTo < 0 || (_y + (lines - 1) * _t->_st->font->height) < _yTo) {
_yTo = _y + (lines * _t->_st->font->height);
_elideLast = true;
_elideRemoveFromEnd = context.elisionRemoveFromEnd;
}
_breakEverywhere = context.elisionBreakEverywhere;
}
_spoilerCache = context.spoiler;
_selection = context.selection;
_fullWidthSelection = context.fullWidthSelection;
_w = context.availableWidth;
_align = context.align;
_cachedNow = context.now;
_paused = context.paused;
_spoilerOpacity = _spoiler
? (1. - _spoiler->revealAnimation.value(
_spoiler->revealed ? 1. : 0.))
: 0.;
enumerate();
}
void Renderer::enumerate() {
_blocksSize = _t->_blocks.size();
_wLeft = _w;
if (_elideLast) {
_yToElide = _yTo;
if (_elideRemoveFromEnd > 0 && !_t->_blocks.empty()) {
int firstBlockHeight = CountBlockHeight(_t->_blocks.front().get(), _t->_st);
if (_y + firstBlockHeight >= _yToElide) {
_wLeft -= _elideRemoveFromEnd;
}
}
}
_str = _t->_text.unicode();
if (_p) {
auto clip = _p->hasClipping() ? _p->clipBoundingRect() : QRect();
if (clip.width() > 0 || clip.height() > 0) {
if (_yFrom < clip.y()) _yFrom = clip.y();
if (_yTo < 0 || _yTo > clip.y() + clip.height()) _yTo = clip.y() + clip.height();
}
}
_parDirection = _t->_startDir;
if (_parDirection == Qt::LayoutDirectionAuto) _parDirection = style::LayoutDirection();
if ((*_t->_blocks.cbegin())->type() != TextBlockTNewline) {
initNextParagraph(_t->_blocks.cbegin());
}
_lineStart = 0;
_lineStartBlock = 0;
_lineHeight = 0;
_fontHeight = _t->_st->font->height;
auto last_rBearing = QFixed(0);
_last_rPadding = QFixed(0);
const auto guard = gsl::finally([&] {
if (_p) {
paintSpoilerRects();
}
});
auto blockIndex = 0;
bool longWordLine = true;
auto e = _t->_blocks.cend();
for (auto i = _t->_blocks.cbegin(); i != e; ++i, ++blockIndex) {
auto b = i->get();
auto _btype = b->type();
auto blockHeight = CountBlockHeight(b, _t->_st);
if (_btype == TextBlockTNewline) {
if (!_lineHeight) _lineHeight = blockHeight;
if (!drawLine((*i)->from(), i, e)) {
return;
}
_y += _lineHeight;
_lineHeight = 0;
_lineStart = _t->countBlockEnd(i, e);
_lineStartBlock = blockIndex + 1;
last_rBearing = b->f_rbearing();
_last_rPadding = b->f_rpadding();
_wLeft = _w - (b->f_width() - last_rBearing);
if (_elideLast && _elideRemoveFromEnd > 0 && (_y + blockHeight >= _yToElide)) {
_wLeft -= _elideRemoveFromEnd;
}
_parDirection = static_cast<const NewlineBlock*>(b)->nextDirection();
if (_parDirection == Qt::LayoutDirectionAuto) _parDirection = style::LayoutDirection();
initNextParagraph(i + 1);
longWordLine = true;
continue;
}
auto b__f_rbearing = b->f_rbearing();
auto newWidthLeft = _wLeft - last_rBearing - (_last_rPadding + b->f_width() - b__f_rbearing);
if (newWidthLeft >= 0) {
last_rBearing = b__f_rbearing;
_last_rPadding = b->f_rpadding();
_wLeft = newWidthLeft;
_lineHeight = qMax(_lineHeight, blockHeight);
longWordLine = false;
continue;
}
if (_btype == TextBlockTText) {
auto t = static_cast<const TextBlock*>(b);
if (t->_words.isEmpty()) { // no words in this block, spaces only => layout this block in the same line
_last_rPadding += b->f_rpadding();
_lineHeight = qMax(_lineHeight, blockHeight);
longWordLine = false;
continue;
}
auto f_wLeft = _wLeft; // vars for saving state of the last word start
auto f_lineHeight = _lineHeight; // f points to the last word-start element of t->_words
for (auto j = t->_words.cbegin(), en = t->_words.cend(), f = j; j != en; ++j) {
auto wordEndsHere = (j->f_width() >= 0);
auto j_width = wordEndsHere ? j->f_width() : -j->f_width();
auto newWidthLeft = _wLeft - last_rBearing - (_last_rPadding + j_width - j->f_rbearing());
if (newWidthLeft >= 0) {
last_rBearing = j->f_rbearing();
_last_rPadding = j->f_rpadding();
_wLeft = newWidthLeft;
_lineHeight = qMax(_lineHeight, blockHeight);
if (wordEndsHere) {
longWordLine = false;
}
if (wordEndsHere || longWordLine) {
f = j + 1;
f_wLeft = _wLeft;
f_lineHeight = _lineHeight;
}
continue;
}
auto elidedLineHeight = qMax(_lineHeight, blockHeight);
auto elidedLine = _elideLast && (_y + elidedLineHeight >= _yToElide);
if (elidedLine) {
_lineHeight = elidedLineHeight;
} else if (f != j && !_breakEverywhere) {
// word did not fit completely, so we roll back the state to the beginning of this long word
j = f;
_wLeft = f_wLeft;
_lineHeight = f_lineHeight;
j_width = (j->f_width() >= 0) ? j->f_width() : -j->f_width();
}
if (!drawLine(elidedLine ? ((j + 1 == en) ? _t->countBlockEnd(i, e) : (j + 1)->from()) : j->from(), i, e)) {
return;
}
_y += _lineHeight;
_lineHeight = qMax(0, blockHeight);
_lineStart = j->from();
_lineStartBlock = blockIndex;
last_rBearing = j->f_rbearing();
_last_rPadding = j->f_rpadding();
_wLeft = _w - (j_width - last_rBearing);
if (_elideLast && _elideRemoveFromEnd > 0 && (_y + blockHeight >= _yToElide)) {
_wLeft -= _elideRemoveFromEnd;
}
longWordLine = !wordEndsHere;
f = j + 1;
f_wLeft = _wLeft;
f_lineHeight = _lineHeight;
}
continue;
}
auto elidedLineHeight = qMax(_lineHeight, blockHeight);
auto elidedLine = _elideLast && (_y + elidedLineHeight >= _yToElide);
if (elidedLine) {
_lineHeight = elidedLineHeight;
}
if (!drawLine(elidedLine ? _t->countBlockEnd(i, e) : b->from(), i, e)) {
return;
}
_y += _lineHeight;
_lineHeight = qMax(0, blockHeight);
_lineStart = b->from();
_lineStartBlock = blockIndex;
last_rBearing = b__f_rbearing;
_last_rPadding = b->f_rpadding();
_wLeft = _w - (b->f_width() - last_rBearing);
if (_elideLast && _elideRemoveFromEnd > 0 && (_y + blockHeight >= _yToElide)) {
_wLeft -= _elideRemoveFromEnd;
}
longWordLine = true;
continue;
}
if (_lineStart < _t->_text.size()) {
if (!drawLine(_t->_text.size(), e, e)) return;
}
if (!_p && _lookupSymbol) {
_lookupResult.symbol = _t->_text.size();
_lookupResult.afterSymbol = false;
}
}
StateResult Renderer::getState(QPoint point, int w, StateRequest request) {
if (_t->isEmpty() || point.y() < 0) {
return {};
}
_lookupRequest = request;
_lookupX = point.x();
_lookupY = point.y();
_breakEverywhere = (_lookupRequest.flags & StateRequest::Flag::BreakEverywhere);
_lookupSymbol = (_lookupRequest.flags & StateRequest::Flag::LookupSymbol);
_lookupLink = (_lookupRequest.flags & StateRequest::Flag::LookupLink);
if (!_lookupSymbol && (_lookupX < 0 || _lookupX >= w)) {
return {};
}
_w = w;
_yFrom = _lookupY;
_yTo = _lookupY + 1;
_align = _lookupRequest.align;
enumerate();
return _lookupResult;
}
StateResult Renderer::getStateElided(QPoint point, int w, StateRequestElided request) {
if (_t->isEmpty() || point.y() < 0 || request.lines <= 0) {
return {};
}
_lookupRequest = request;
_lookupX = point.x();
_lookupY = point.y();
_breakEverywhere = (_lookupRequest.flags & StateRequest::Flag::BreakEverywhere);
_lookupSymbol = (_lookupRequest.flags & StateRequest::Flag::LookupSymbol);
_lookupLink = (_lookupRequest.flags & StateRequest::Flag::LookupLink);
if (!_lookupSymbol && (_lookupX < 0 || _lookupX >= w)) {
return {};
}
int yTo = _lookupY + 1;
if (yTo < 0 || (request.lines - 1) * _t->_st->font->height < yTo) {
yTo = request.lines * _t->_st->font->height;
_elideLast = true;
_elideRemoveFromEnd = request.removeFromEnd;
}
_w = w;
_yFrom = _lookupY;
_yTo = _lookupY + 1;
_align = _lookupRequest.align;
enumerate();
return _lookupResult;
}
crl::time Renderer::now() const {
if (!_cachedNow) {
_cachedNow = crl::now();
}
return _cachedNow;
}
void Renderer::initNextParagraph(String::TextBlocks::const_iterator i) {
_parStartBlock = i;
const auto e = _t->_blocks.cend();
if (i == e) {
_parStart = _t->_text.size();
_parLength = 0;
} else {
_parStart = (*i)->from();
for (; i != e; ++i) {
if ((*i)->type() == TextBlockTNewline) {
break;
}
}
_parLength = ((i == e) ? _t->_text.size() : (*i)->from()) - _parStart;
}
_parAnalysis.resize(0);
}
void Renderer::initParagraphBidi() {
if (!_parLength || !_parAnalysis.isEmpty()) return;
String::TextBlocks::const_iterator i = _parStartBlock, e = _t->_blocks.cend(), n = i + 1;
bool ignore = false;
bool rtl = (_parDirection == Qt::RightToLeft);
if (!ignore && !rtl) {
ignore = true;
const ushort *start = reinterpret_cast<const ushort*>(_str) + _parStart;
const ushort *curr = start;
const ushort *end = start + _parLength;
while (curr < end) {
while (n != e && (*n)->from() <= _parStart + (curr - start)) {
i = n;
++n;
}
const auto type = (*i)->type();
if (type != TextBlockTEmoji
&& type != TextBlockTCustomEmoji
&& *curr >= 0x590) {
ignore = false;
break;
}
++curr;
}
}
_parAnalysis.resize(_parLength);
QScriptAnalysis *analysis = _parAnalysis.data();
BidiControl control(rtl);
_parHasBidi = false;
if (ignore) {
memset(analysis, 0, _parLength * sizeof(QScriptAnalysis));
if (rtl) {
for (int i = 0; i < _parLength; ++i)
analysis[i].bidiLevel = 1;
_parHasBidi = true;
}
} else {
_parHasBidi = eBidiItemize(analysis, control);
}
}
bool Renderer::drawLine(uint16 _lineEnd, const String::TextBlocks::const_iterator &_endBlockIter, const String::TextBlocks::const_iterator &_end) {
_yDelta = (_lineHeight - _fontHeight) / 2;
if (_yTo >= 0 && (_y + _yDelta >= _yTo || _y >= _yTo)) return false;
if (_y + _yDelta + _fontHeight <= _yFrom) {
if (_lookupSymbol) {
_lookupResult.symbol = (_lineEnd > _lineStart) ? (_lineEnd - 1) : _lineStart;
_lookupResult.afterSymbol = (_lineEnd > _lineStart) ? true : false;
}
return true;
}
// Trimming pending spaces, because they sometimes don't fit on the line.
// They also are not counted in the line width, they're in the right padding.
// Line width is a sum of block / word widths and paddings between them, without trailing one.
auto trimmedLineEnd = _lineEnd;
for (; trimmedLineEnd > _lineStart; --trimmedLineEnd) {
auto ch = _t->_text[trimmedLineEnd - 1];
if (ch != QChar::Space && ch != QChar::LineFeed) {
break;
}
}
auto _endBlock = (_endBlockIter == _end) ? nullptr : _endBlockIter->get();
auto elidedLine = _elideLast && (_y + _lineHeight >= _yToElide);
if (elidedLine) {
// If we decided to draw the last line elided only because of the skip block
// that did not fit on this line, we just draw the line till the very end.
// Skip block is ignored in the elided lines, instead "removeFromEnd" is used.
if (_endBlock && _endBlock->type() == TextBlockTSkip) {
_endBlock = nullptr;
}
if (!_endBlock) {
elidedLine = false;
}
}
auto blockIndex = _lineStartBlock;
auto currentBlock = _t->_blocks[blockIndex].get();
auto nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
const auto extendLeft = (currentBlock->from() < _lineStart)
? qMin(_lineStart - currentBlock->from(), 2)
: 0;
_localFrom = _lineStart - extendLeft;
const auto extendedLineEnd = (_endBlock && _endBlock->from() < trimmedLineEnd && !elidedLine)
? qMin(uint16(trimmedLineEnd + 2), _t->countBlockEnd(_endBlockIter, _end))
: trimmedLineEnd;
auto lineText = _t->_text.mid(_localFrom, extendedLineEnd - _localFrom);
auto lineStart = extendLeft;
auto lineLength = trimmedLineEnd - _lineStart;
if (elidedLine) {
initParagraphBidi();
prepareElidedLine(lineText, lineStart, lineLength, _endBlock);
}
auto x = _x;
if (_align & Qt::AlignHCenter) {
x += (_wLeft / 2).toInt();
} else if (((_align & Qt::AlignLeft) && _parDirection == Qt::RightToLeft) || ((_align & Qt::AlignRight) && _parDirection == Qt::LeftToRight)) {
x += _wLeft;
}
if (!_p) {
if (_lookupX < x) {
if (_lookupSymbol) {
if (_parDirection == Qt::RightToLeft) {
_lookupResult.symbol = (_lineEnd > _lineStart) ? (_lineEnd - 1) : _lineStart;
_lookupResult.afterSymbol = (_lineEnd > _lineStart) ? true : false;
// _lookupResult.uponSymbol = ((_lookupX >= _x) && (_lineEnd < _t->_text.size()) && (!_endBlock || _endBlock->type() != TextBlockTSkip)) ? true : false;
} else {
_lookupResult.symbol = _lineStart;
_lookupResult.afterSymbol = false;
// _lookupResult.uponSymbol = ((_lookupX >= _x) && (_lineStart > 0)) ? true : false;
}
}
if (_lookupLink) {
_lookupResult.link = nullptr;
}
_lookupResult.uponSymbol = false;
return false;
} else if (_lookupX >= x + (_w - _wLeft)) {
if (_parDirection == Qt::RightToLeft) {
_lookupResult.symbol = _lineStart;
_lookupResult.afterSymbol = false;
// _lookupResult.uponSymbol = ((_lookupX < _x + _w) && (_lineStart > 0)) ? true : false;
} else {
_lookupResult.symbol = (_lineEnd > _lineStart) ? (_lineEnd - 1) : _lineStart;
_lookupResult.afterSymbol = (_lineEnd > _lineStart) ? true : false;
// _lookupResult.uponSymbol = ((_lookupX < _x + _w) && (_lineEnd < _t->_text.size()) && (!_endBlock || _endBlock->type() != TextBlockTSkip)) ? true : false;
}
if (_lookupLink) {
_lookupResult.link = nullptr;
}
_lookupResult.uponSymbol = false;
return false;
}
}
if (_fullWidthSelection) {
const auto selectFromStart = (_selection.to > _lineStart)
&& (_lineStart > 0)
&& (_selection.from <= _lineStart);
const auto selectTillEnd = (_selection.to > trimmedLineEnd)
&& (trimmedLineEnd < _t->_text.size())
&& (_selection.from <= trimmedLineEnd)
&& (!_endBlock || _endBlock->type() != TextBlockTSkip);
if ((selectFromStart && _parDirection == Qt::LeftToRight)
|| (selectTillEnd && _parDirection == Qt::RightToLeft)) {
if (x > _x) {
fillSelectRange({ _x, x });
}
}
if ((selectTillEnd && _parDirection == Qt::LeftToRight)
|| (selectFromStart && _parDirection == Qt::RightToLeft)) {
if (x < _x + _wLeft) {
fillSelectRange({ x + _w - _wLeft, _x + _w });
}
}
}
if (trimmedLineEnd == _lineStart && !elidedLine) {
return true;
}
if (!elidedLine) initParagraphBidi(); // if was not inited
_f = _t->_st->font;
QStackTextEngine engine(lineText, _f->f);
engine.option.setTextDirection(_parDirection);
_e = &engine;
eItemize();
QScriptLine line;
line.from = lineStart;
line.length = lineLength;
eShapeLine(line);
int firstItem = engine.findItem(line.from), lastItem = engine.findItem(line.from + line.length - 1);
int nItems = (firstItem >= 0 && lastItem >= firstItem) ? (lastItem - firstItem + 1) : 0;
if (!nItems) {
return true;
}
int skipIndex = -1;
QVarLengthArray<int> visualOrder(nItems);
QVarLengthArray<uchar> levels(nItems);
for (int i = 0; i < nItems; ++i) {
auto &si = engine.layoutData->items[firstItem + i];
while (nextBlock && nextBlock->from() <= _localFrom + si.position) {
currentBlock = nextBlock;
nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
}
auto _type = currentBlock->type();
if (_type == TextBlockTSkip) {
levels[i] = si.analysis.bidiLevel = 0;
skipIndex = i;
} else {
levels[i] = si.analysis.bidiLevel;
}
if (si.analysis.flags == QScriptAnalysis::Object) {
if (_type == TextBlockTEmoji
|| _type == TextBlockTCustomEmoji
|| _type == TextBlockTSkip) {
si.width = currentBlock->f_width()
+ (nextBlock == _endBlock && (!nextBlock || nextBlock->from() >= trimmedLineEnd)
? 0
: currentBlock->f_rpadding());
}
}
}
QTextEngine::bidiReorder(nItems, levels.data(), visualOrder.data());
if (style::RightToLeft() && skipIndex == nItems - 1) {
for (int32 i = nItems; i > 1;) {
--i;
visualOrder[i] = visualOrder[i - 1];
}
visualOrder[0] = skipIndex;
}
blockIndex = _lineStartBlock;
currentBlock = _t->_blocks[blockIndex].get();
nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
int32 textY = _y + _yDelta + _t->_st->font->ascent, emojiY = (_t->_st->font->height - st::emojiSize) / 2;
applyBlockProperties(currentBlock);
for (int i = 0; i < nItems; ++i) {
const auto item = firstItem + visualOrder[i];
const auto isLastItem = (item == lastItem);
const auto &si = engine.layoutData->items.at(item);
const auto rtl = (si.analysis.bidiLevel % 2);
while (blockIndex > _lineStartBlock + 1 && _t->_blocks[blockIndex - 1]->from() > _localFrom + si.position) {
nextBlock = currentBlock;
currentBlock = _t->_blocks[--blockIndex - 1].get();
applyBlockProperties(currentBlock);
}
while (nextBlock && nextBlock->from() <= _localFrom + si.position) {
currentBlock = nextBlock;
nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
applyBlockProperties(currentBlock);
}
if (si.analysis.flags >= QScriptAnalysis::TabOrObject) {
TextBlockType _type = currentBlock->type();
if (!_p && _lookupX >= x && _lookupX < x + si.width) { // _lookupRequest
if (_lookupLink) {
if (_lookupY >= _y + _yDelta && _lookupY < _y + _yDelta + _fontHeight) {
if (const auto link = lookupLink(currentBlock)) {
_lookupResult.link = link;
}
}
}
if (_type != TextBlockTSkip) {
_lookupResult.uponSymbol = true;
}
if (_lookupSymbol) {
if (_type == TextBlockTSkip) {
if (_parDirection == Qt::RightToLeft) {
_lookupResult.symbol = _lineStart;
_lookupResult.afterSymbol = false;
} else {
_lookupResult.symbol = (trimmedLineEnd > _lineStart) ? (trimmedLineEnd - 1) : _lineStart;
_lookupResult.afterSymbol = (trimmedLineEnd > _lineStart) ? true : false;
}
return false;
}
// Emoji with spaces after symbol lookup
auto chFrom = _str + currentBlock->from();
auto chTo = chFrom + ((nextBlock ? nextBlock->from() : _t->_text.size()) - currentBlock->from());
auto spacesWidth = (si.width - currentBlock->f_width());
auto spacesCount = 0;
while (chTo > chFrom && (chTo - 1)->unicode() == QChar::Space) {
++spacesCount;
--chTo;
}
if (spacesCount > 0) { // Check if we're over a space.
if (rtl) {
if (_lookupX < x + spacesWidth) {
_lookupResult.symbol = (chTo - _str); // up to a space, included, rtl
_lookupResult.afterSymbol = (_lookupX < x + (spacesWidth / 2)) ? true : false;
return false;
}
} else if (_lookupX >= x + si.width - spacesWidth) {
_lookupResult.symbol = (chTo - _str); // up to a space, inclided, ltr
_lookupResult.afterSymbol = (_lookupX >= x + si.width - spacesWidth + (spacesWidth / 2)) ? true : false;
return false;
}
}
if (_lookupX < x + (rtl ? (si.width - currentBlock->f_width()) : 0) + (currentBlock->f_width() / 2)) {
_lookupResult.symbol = ((rtl && chTo > chFrom) ? (chTo - 1) : chFrom) - _str;
_lookupResult.afterSymbol = (rtl && chTo > chFrom) ? true : false;
} else {
_lookupResult.symbol = ((rtl || chTo <= chFrom) ? chFrom : (chTo - 1)) - _str;
_lookupResult.afterSymbol = (rtl || chTo <= chFrom) ? false : true;
}
}
return false;
} else if (_p && (_type == TextBlockTEmoji || _type == TextBlockTCustomEmoji)) {
auto glyphX = x;
auto spacesWidth = (si.width - currentBlock->f_width());
if (rtl) {
glyphX += spacesWidth;
}
FixedRange fillSelect;
FixedRange fillSpoiler;
if (_background.selectActiveBlock) {
fillSelect = { x, x + si.width };
} else if (_localFrom + si.position < _selection.to) {
auto chFrom = _str + currentBlock->from();
auto chTo = chFrom + ((nextBlock ? nextBlock->from() : _t->_text.size()) - currentBlock->from());
if (_localFrom + si.position >= _selection.from) { // could be without space
if (chTo == chFrom || (chTo - 1)->unicode() != QChar::Space || _selection.to >= (chTo - _str)) {
fillSelect = { x, x + si.width };
} else { // or with space
fillSelect = { glyphX, glyphX + currentBlock->f_width() };
}
} else if (chTo > chFrom && (chTo - 1)->unicode() == QChar::Space && (chTo - 1 - _str) >= _selection.from) {
if (rtl) { // rtl space only
fillSelect = { x, glyphX };
} else { // ltr space only
fillSelect = { x + currentBlock->f_width(), x + si.width };
}
}
}
const auto hasSpoiler = _background.spoiler
&& (_spoilerOpacity > 0.);
if (hasSpoiler) {
fillSpoiler = { x, x + si.width };
}
fillSelectRange(fillSelect);
const auto opacity = _p->opacity();
if (!hasSpoiler || _spoilerOpacity < 1.) {
if (hasSpoiler) {
_p->setOpacity(opacity * (1. - _spoilerOpacity));
}
const auto x = (glyphX + st::emojiPadding).toInt();
const auto y = _y + _yDelta + emojiY;
if (_type == TextBlockTEmoji) {
Emoji::Draw(
*_p,
static_cast<const EmojiBlock*>(currentBlock)->_emoji,
Emoji::GetSizeNormal(),
x,
y);
} else if (const auto custom = static_cast<const CustomEmojiBlock*>(currentBlock)->_custom.get()) {
if (!_customEmojiSize) {
_customEmojiSize = AdjustCustomEmojiSize(st::emojiSize);
_customEmojiSkip = (st::emojiSize - _customEmojiSize) / 2;
}
custom->paint(*_p, {
.preview = _palette->spoilerFg->c,
.now = now(),
.position = { x + _customEmojiSkip, y + _customEmojiSkip },
.paused = _paused,
});
}
if (hasSpoiler) {
_p->setOpacity(opacity);
}
}
if (hasSpoiler) {
// Elided item should be a text item
// with '...' at the end, so this should not be it.
const auto isElidedItem = false;
pushSpoilerRange(fillSpoiler, fillSelect, isElidedItem);
}
//} else if (_p && currentBlock->type() == TextBlockSkip) { // debug
// _p->fillRect(QRect(x.toInt(), _y, currentBlock->width(), static_cast<SkipBlock*>(currentBlock)->height()), QColor(0, 0, 0, 32));
}
x += si.width;
continue;
}
unsigned short *logClusters = engine.logClusters(&si);
QGlyphLayout glyphs = engine.shapedGlyphs(&si);
int itemStart = qMax(line.from, si.position), itemEnd;
int itemLength = engine.length(item);
int glyphsStart = logClusters[itemStart - si.position], glyphsEnd;
if (line.from + line.length < si.position + itemLength) {
itemEnd = line.from + line.length;
glyphsEnd = logClusters[itemEnd - si.position];
} else {
itemEnd = si.position + itemLength;
glyphsEnd = si.num_glyphs;
}
QFixed itemWidth = 0;
for (int g = glyphsStart; g < glyphsEnd; ++g)
itemWidth += glyphs.effectiveAdvance(g);
if (!_p && _lookupX >= x && _lookupX < x + itemWidth) { // _lookupRequest
if (_lookupLink) {
if (_lookupY >= _y + _yDelta && _lookupY < _y + _yDelta + _fontHeight) {
if (const auto link = lookupLink(currentBlock)) {
_lookupResult.link = link;
}
}
}
_lookupResult.uponSymbol = true;
if (_lookupSymbol) {
QFixed tmpx = rtl ? (x + itemWidth) : x;
for (int ch = 0, g, itemL = itemEnd - itemStart; ch < itemL;) {
g = logClusters[itemStart - si.position + ch];
QFixed gwidth = glyphs.effectiveAdvance(g);
// ch2 - glyph end, ch - glyph start, (ch2 - ch) - how much chars it takes
int ch2 = ch + 1;
while ((ch2 < itemL) && (g == logClusters[itemStart - si.position + ch2])) {
++ch2;
}
for (int charsCount = (ch2 - ch); ch < ch2; ++ch) {
QFixed shift1 = QFixed(2 * (charsCount - (ch2 - ch)) + 2) * gwidth / QFixed(2 * charsCount),
shift2 = QFixed(2 * (charsCount - (ch2 - ch)) + 1) * gwidth / QFixed(2 * charsCount);
if ((rtl && _lookupX >= tmpx - shift1) ||
(!rtl && _lookupX < tmpx + shift1)) {
_lookupResult.symbol = _localFrom + itemStart + ch;
if ((rtl && _lookupX >= tmpx - shift2) ||
(!rtl && _lookupX < tmpx + shift2)) {
_lookupResult.afterSymbol = false;
} else {
_lookupResult.afterSymbol = true;
}
return false;
}
}
if (rtl) {
tmpx -= gwidth;
} else {
tmpx += gwidth;
}
}
if (itemEnd > itemStart) {
_lookupResult.symbol = _localFrom + itemEnd - 1;
_lookupResult.afterSymbol = true;
} else {
_lookupResult.symbol = _localFrom + itemStart;
_lookupResult.afterSymbol = false;
}
}
return false;
} else if (_p) {
QTextItemInt gf;
gf.glyphs = glyphs.mid(glyphsStart, glyphsEnd - glyphsStart);
gf.f = &_e->fnt;
gf.chars = engine.layoutData->string.unicode() + itemStart;
gf.num_chars = itemEnd - itemStart;
gf.fontEngine = engine.fontEngine(si);
gf.logClusters = logClusters + itemStart - si.position;
gf.width = itemWidth;
gf.justified = false;
InitTextItemWithScriptItem(gf, si);
auto itemRange = FixedRange{ x, x + itemWidth };
auto fillSelect = FixedRange();
auto hasSelected = false;
auto hasNotSelected = true;
auto selectedRect = QRect();
if (_background.selectActiveBlock) {
fillSelect = itemRange;
fillSelectRange(fillSelect);
} else if (_localFrom + itemStart < _selection.to && _localFrom + itemEnd > _selection.from) {
hasSelected = true;
auto selX = x;
auto selWidth = itemWidth;
if (_localFrom + itemStart >= _selection.from && _localFrom + itemEnd <= _selection.to) {
hasNotSelected = false;
} else {
selWidth = 0;
int itemL = itemEnd - itemStart;
int selStart = _selection.from - (_localFrom + itemStart), selEnd = _selection.to - (_localFrom + itemStart);
if (selStart < 0) selStart = 0;
if (selEnd > itemL) selEnd = itemL;
for (int ch = 0, g; ch < selEnd;) {
g = logClusters[itemStart - si.position + ch];
QFixed gwidth = glyphs.effectiveAdvance(g);
// ch2 - glyph end, ch - glyph start, (ch2 - ch) - how much chars it takes
int ch2 = ch + 1;
while ((ch2 < itemL) && (g == logClusters[itemStart - si.position + ch2])) {
++ch2;
}
if (ch2 <= selStart) {
selX += gwidth;
} else if (ch >= selStart && ch2 <= selEnd) {
selWidth += gwidth;
} else {
int sStart = ch, sEnd = ch2;
if (ch < selStart) {
sStart = selStart;
selX += QFixed(sStart - ch) * gwidth / QFixed(ch2 - ch);
}
if (ch2 >= selEnd) {
sEnd = selEnd;
selWidth += QFixed(sEnd - sStart) * gwidth / QFixed(ch2 - ch);
break;
}
selWidth += QFixed(sEnd - sStart) * gwidth / QFixed(ch2 - ch);
}
ch = ch2;
}
}
if (rtl) selX = x + itemWidth - (selX - x) - selWidth;
selectedRect = QRect(selX.toInt(), _y + _yDelta, (selX + selWidth).toInt() - selX.toInt(), _fontHeight);
fillSelect = { selX, selX + selWidth };
fillSelectRange(fillSelect);
}
const auto hasSpoiler = _background.spoiler
&& (_spoilerOpacity > 0.);
const auto opacity = _p->opacity();
const auto isElidedItem = (_indexOfElidedBlock == blockIndex)
&& isLastItem;
const auto complexClipping = hasSpoiler
&& isElidedItem
&& (_spoilerOpacity == 1.);
if (!hasSpoiler || (_spoilerOpacity < 1.) || isElidedItem) {
const auto complexClippingEnabled = complexClipping
&& _p->hasClipping();
const auto complexClippingRegion = complexClipping
? _p->clipRegion()
: QRegion();
if (complexClipping) {
const auto elided = (_indexOfElidedBlock == blockIndex)
? (_elideRemoveFromEnd + _f->elidew)
: 0;
_p->setClipRect(
QRect(
(x + itemWidth).toInt() - elided,
_y - _lineHeight,
elided,
_y + 2 * _lineHeight),
Qt::IntersectClip);
} else if (hasSpoiler && !isElidedItem) {
_p->setOpacity(opacity * (1. - _spoilerOpacity));
}
if (Q_UNLIKELY(hasSelected)) {
if (Q_UNLIKELY(hasNotSelected)) {
// There is a bug in retina QPainter clipping stack.
// You can see glitches in rendering in such text:
// aA
// Aa
// Where selection is both 'A'-s.
// I can't debug it right now, this is a workaround.
#ifdef Q_OS_MAC
_p->save();
#endif // Q_OS_MAC
const auto clippingEnabled = _p->hasClipping();
const auto clippingRegion = _p->clipRegion();
_p->setClipRect(selectedRect, Qt::IntersectClip);
_p->setPen(*_currentPenSelected);
_p->drawTextItem(QPointF(x.toReal(), textY), gf);
const auto externalClipping = clippingEnabled
? clippingRegion
: QRegion(QRect(
(_x - _w).toInt(),
_y - _lineHeight,
(_x + 2 * _w).toInt(),
_y + 2 * _lineHeight));
_p->setClipRegion(externalClipping - selectedRect);
_p->setPen(*_currentPen);
_p->drawTextItem(QPointF(x.toReal(), textY), gf);
#ifdef Q_OS_MAC
_p->restore();
#else // Q_OS_MAC
if (clippingEnabled) {
_p->setClipRegion(clippingRegion);
} else {
_p->setClipping(false);
}
#endif // Q_OS_MAC
} else {
_p->setPen(*_currentPenSelected);
_p->drawTextItem(QPointF(x.toReal(), textY), gf);
}
} else {
_p->setPen(*_currentPen);
_p->drawTextItem(QPointF(x.toReal(), textY), gf);
}
if (complexClipping) {
if (complexClippingEnabled) {
_p->setClipRegion(complexClippingRegion);
} else {
_p->setClipping(false);
}
} else if (hasSpoiler && !isElidedItem) {
_p->setOpacity(opacity);
}
}
if (hasSpoiler) {
pushSpoilerRange(itemRange, fillSelect, isElidedItem);
}
}
x += itemWidth;
}
fillSpoilerRects();
return true;
}
void Renderer::fillSelectRange(FixedRange range) {
if (range.empty()) {
return;
}
const auto left = range.from.toInt();
const auto width = range.till.toInt() - left;
_p->fillRect(left, _y + _yDelta, width, _fontHeight, _palette->selectBg);
}
void Renderer::pushSpoilerRange(
FixedRange range,
FixedRange selected,
bool isElidedItem) {
if (!_background.spoiler || !_spoiler) {
return;
}
const auto elided = isElidedItem
? (_elideRemoveFromEnd + _f->elidew)
: 0;
range.till -= elided;
if (range.empty()) {
return;
} else if (selected.empty() || !Intersects(range, selected)) {
AppendRange(_spoilerRanges, range);
} else {
AppendRange(_spoilerRanges, { range.from, selected.from });
AppendRange(_spoilerSelectedRanges, Intersected(range, selected));
AppendRange(_spoilerRanges, { selected.till, range.till });
}
}
void Renderer::fillSpoilerRects() {
fillSpoilerRects(_spoilerRects, _spoilerRanges);
fillSpoilerRects(_spoilerSelectedRects, _spoilerSelectedRanges);
}
void Renderer::fillSpoilerRects(
QVarLengthArray<QRect, kSpoilersRectsSize> &rects,
QVarLengthArray<FixedRange> &ranges) {
if (ranges.empty()) {
return;
}
auto lastTill = ranges.front().from.toInt() - 1;
const auto y = _y + _yDelta;
for (const auto &range : ranges) {
auto from = range.from.toInt();
auto till = range.till.toInt();
if (from <= lastTill) {
auto &last = rects.back();
from = std::min(from, last.x());
till = std::max(till, last.x() + last.width());
last = { from, y, till - from, _fontHeight };
} else {
rects.push_back({ from, y, till - from, _fontHeight });
}
lastTill = till;
}
ranges.clear();
}
void Renderer::paintSpoilerRects() {
Expects(_p != nullptr);
if (!_spoiler) {
return;
}
const auto opacity = _p->opacity();
if (_spoilerOpacity < 1.) {
_p->setOpacity(opacity * _spoilerOpacity);
}
const auto index = _spoiler->animation.index(now(), _paused);
paintSpoilerRects(
_spoilerRects,
_palette->spoilerFg,
index);
paintSpoilerRects(
_spoilerSelectedRects,
_palette->selectSpoilerFg,
index);
if (_spoilerOpacity < 1.) {
_p->setOpacity(opacity);
}
}
void Renderer::paintSpoilerRects(
const QVarLengthArray<QRect, kSpoilersRectsSize> &rects,
const style::color &color,
int index) {
if (rects.empty()) {
return;
}
const auto frame = _spoilerCache->lookup(color->c)->frame(index);
if (_spoilerCache) {
for (const auto &rect : rects) {
Ui::FillSpoilerRect(*_p, rect, frame, -rect.topLeft());
}
} else {
// Show forgotten spoiler context part.
for (const auto &rect : rects) {
_p->fillRect(rect, Qt::red);
}
}
}
void Renderer::elideSaveBlock(int32 blockIndex, const AbstractBlock *&_endBlock, int32 elideStart, int32 elideWidth) {
if (_elideSavedBlock) {
restoreAfterElided();
}
_elideSavedIndex = blockIndex;
auto mutableText = const_cast<String*>(_t);
_elideSavedBlock = std::move(mutableText->_blocks[blockIndex]);
mutableText->_blocks[blockIndex] = Block::Text(_t->_st->font, _t->_text, QFIXED_MAX, elideStart, 0, (*_elideSavedBlock)->flags(), (*_elideSavedBlock)->lnkIndex(), (*_elideSavedBlock)->spoilerIndex());
_blocksSize = blockIndex + 1;
_endBlock = (blockIndex + 1 < _t->_blocks.size() ? _t->_blocks[blockIndex + 1].get() : nullptr);
}
void Renderer::setElideBidi(int32 elideStart, int32 elideLen) {
int32 newParLength = elideStart + elideLen - _parStart;
if (newParLength > _parAnalysis.size()) {
_parAnalysis.resize(newParLength);
}
for (int32 i = elideLen; i > 0; --i) {
_parAnalysis[newParLength - i].bidiLevel = (_parDirection == Qt::RightToLeft) ? 1 : 0;
}
}
void Renderer::prepareElidedLine(QString &lineText, int32 lineStart, int32 &lineLength, const AbstractBlock *&_endBlock, int repeat) {
_f = _t->_st->font;
QStackTextEngine engine(lineText, _f->f);
engine.option.setTextDirection(_parDirection);
_e = &engine;
eItemize();
auto blockIndex = _lineStartBlock;
auto currentBlock = _t->_blocks[blockIndex].get();
auto nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
QScriptLine line;
line.from = lineStart;
line.length = lineLength;
eShapeLine(line);
auto elideWidth = _f->elidew;
_wLeft = _w - elideWidth - _elideRemoveFromEnd;
int firstItem = engine.findItem(line.from), lastItem = engine.findItem(line.from + line.length - 1);
int nItems = (firstItem >= 0 && lastItem >= firstItem) ? (lastItem - firstItem + 1) : 0, i;
for (i = 0; i < nItems; ++i) {
QScriptItem &si(engine.layoutData->items[firstItem + i]);
while (nextBlock && nextBlock->from() <= _localFrom + si.position) {
currentBlock = nextBlock;
nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
}
TextBlockType _type = currentBlock->type();
if (si.analysis.flags == QScriptAnalysis::Object) {
if (_type == TextBlockTEmoji
|| _type == TextBlockTCustomEmoji
|| _type == TextBlockTSkip) {
si.width = currentBlock->f_width() + currentBlock->f_rpadding();
}
}
if (_type == TextBlockTEmoji
|| _type == TextBlockTCustomEmoji
|| _type == TextBlockTSkip
|| _type == TextBlockTNewline) {
if (_wLeft < si.width) {
lineText = lineText.mid(0, currentBlock->from() - _localFrom) + kQEllipsis;
lineLength = currentBlock->from() + kQEllipsis.size() - _lineStart;
_selection.to = qMin(_selection.to, currentBlock->from());
_indexOfElidedBlock = blockIndex + (nextBlock ? 1 : 0);
setElideBidi(currentBlock->from(), kQEllipsis.size());
elideSaveBlock(blockIndex - 1, _endBlock, currentBlock->from(), elideWidth);
return;
}
_wLeft -= si.width;
} else if (_type == TextBlockTText) {
unsigned short *logClusters = engine.logClusters(&si);
QGlyphLayout glyphs = engine.shapedGlyphs(&si);
int itemStart = qMax(line.from, si.position), itemEnd;
int itemLength = engine.length(firstItem + i);
int glyphsStart = logClusters[itemStart - si.position], glyphsEnd;
if (line.from + line.length < si.position + itemLength) {
itemEnd = line.from + line.length;
glyphsEnd = logClusters[itemEnd - si.position];
} else {
itemEnd = si.position + itemLength;
glyphsEnd = si.num_glyphs;
}
for (auto g = glyphsStart; g < glyphsEnd; ++g) {
auto adv = glyphs.effectiveAdvance(g);
if (_wLeft < adv) {
auto pos = itemStart;
while (pos < itemEnd && logClusters[pos - si.position] < g) {
++pos;
}
if (lineText.size() <= pos || repeat > 3) {
lineText += kQEllipsis;
lineLength = _localFrom + pos + kQEllipsis.size() - _lineStart;
_selection.to = qMin(_selection.to, uint16(_localFrom + pos));
_indexOfElidedBlock = blockIndex + (nextBlock ? 1 : 0);
setElideBidi(_localFrom + pos, kQEllipsis.size());
_blocksSize = blockIndex;
_endBlock = nextBlock;
} else {
lineText = lineText.mid(0, pos);
lineLength = _localFrom + pos - _lineStart;
_blocksSize = blockIndex;
_endBlock = nextBlock;
prepareElidedLine(lineText, lineStart, lineLength, _endBlock, repeat + 1);
}
return;
} else {
_wLeft -= adv;
}
}
}
}
int32 elideStart = _localFrom + lineText.size();
_selection.to = qMin(_selection.to, uint16(elideStart));
_indexOfElidedBlock = blockIndex + (nextBlock ? 1 : 0);
setElideBidi(elideStart, kQEllipsis.size());
lineText += kQEllipsis;
lineLength += kQEllipsis.size();
if (!repeat) {
for (; blockIndex < _blocksSize && _t->_blocks[blockIndex].get() != _endBlock && _t->_blocks[blockIndex]->from() < elideStart; ++blockIndex) {
}
if (blockIndex < _blocksSize) {
elideSaveBlock(blockIndex, _endBlock, elideStart, elideWidth);
}
}
}
void Renderer::restoreAfterElided() {
if (_elideSavedBlock) {
const_cast<String*>(_t)->_blocks[_elideSavedIndex] = std::move(*_elideSavedBlock);
}
}
// COPIED FROM qtextengine.cpp AND MODIFIED
void Renderer::eAppendItems(QScriptAnalysis *analysis, int &start, int &stop, const BidiControl &control, QChar::Direction dir) {
if (start > stop)
return;
int level = control.level;
if(dir != QChar::DirON && !control.override) {
// add level of run (cases I1 & I2)
if(level % 2) {
if(dir == QChar::DirL || dir == QChar::DirAN || dir == QChar::DirEN)
level++;
} else {
if(dir == QChar::DirR)
level++;
else if(dir == QChar::DirAN || dir == QChar::DirEN)
level += 2;
}
}
QScriptAnalysis *s = analysis + start;
const QScriptAnalysis *e = analysis + stop;
while (s <= e) {
s->bidiLevel = level;
++s;
}
++stop;
start = stop;
}
void Renderer::eShapeLine(const QScriptLine &line) {
int item = _e->findItem(line.from);
if (item == -1)
return;
auto end = _e->findItem(line.from + line.length - 1, item);
auto blockIndex = _lineStartBlock;
auto currentBlock = _t->_blocks[blockIndex].get();
auto nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
eSetFont(currentBlock);
for (; item <= end; ++item) {
QScriptItem &si = _e->layoutData->items[item];
while (nextBlock && nextBlock->from() <= _localFrom + si.position) {
currentBlock = nextBlock;
nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
eSetFont(currentBlock);
}
_e->shape(item);
}
}
style::font Renderer::applyFlags(int32 flags, const style::font &f) {
if (!flags) {
return f;
}
auto result = f;
if (IsMono(flags)) {
result = result->monospace();
} else {
if (flags & TextBlockFBold) {
result = result->bold();
} else if (flags & TextBlockFSemibold) {
result = result->semibold();
}
if (flags & TextBlockFItalic) result = result->italic();
if (flags & TextBlockFUnderline) result = result->underline();
if (flags & TextBlockFStrikeOut) result = result->strikeout();
if (flags & TextBlockFTilde) { // tilde fix in OpenSans
result = result->semibold();
}
}
return result;
}
void Renderer::eSetFont(const AbstractBlock *block) {
const auto flags = block->flags();
const auto usedFont = [&] {
if (const auto index = block->lnkIndex()) {
const auto active = ClickHandler::showAsActive(
_t->_links.at(index - 1)
) || (_palette && _palette->linkAlwaysActive > 0);
return active
? _t->_st->linkFontOver
: _t->_st->linkFont;
}
return _t->_st->font;
}();
const auto newFont = applyFlags(flags, usedFont);
if (newFont != _f) {
_f = (newFont->family() == _t->_st->font->family())
? applyFlags(flags | newFont->flags(), _t->_st->font)
: newFont;
_e->fnt = _f->f;
_e->resetFontEngineCache();
}
}
void Renderer::eItemize() {
_e->validate();
if (_e->layoutData->items.size())
return;
int length = _e->layoutData->string.length();
if (!length)
return;
const ushort *string = reinterpret_cast<const ushort*>(_e->layoutData->string.unicode());
auto blockIndex = _lineStartBlock;
auto currentBlock = _t->_blocks[blockIndex].get();
auto nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
_e->layoutData->hasBidi = _parHasBidi;
auto analysis = _parAnalysis.data() + (_localFrom - _parStart);
{
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
QUnicodeTools::ScriptItemArray scriptItems;
QUnicodeTools::initScripts(_e->layoutData->string, &scriptItems);
for (int i = 0; i < scriptItems.length(); ++i) {
const auto &item = scriptItems.at(i);
int end = i < scriptItems.length() - 1 ? scriptItems.at(i + 1).position : length;
for (int j = item.position; j < end; ++j)
analysis[j].script = item.script;
}
#else // Qt >= 6.0.0
QVarLengthArray<uchar> scripts(length);
QUnicodeTools::initScripts(string, length, scripts.data());
for (int i = 0; i < length; ++i)
analysis[i].script = scripts.at(i);
#endif // Qt < 6.0.0
}
blockIndex = _lineStartBlock;
currentBlock = _t->_blocks[blockIndex].get();
nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
auto start = string;
auto end = start + length;
while (start < end) {
while (nextBlock && nextBlock->from() <= _localFrom + (start - string)) {
currentBlock = nextBlock;
nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
}
auto _type = currentBlock->type();
if (_type == TextBlockTEmoji
|| _type == TextBlockTCustomEmoji
|| _type == TextBlockTSkip) {
analysis->script = QChar::Script_Common;
analysis->flags = QScriptAnalysis::Object;
} else {
analysis->flags = QScriptAnalysis::None;
}
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
analysis->script = hbscript_to_script(script_to_hbscript(analysis->script)); // retain the old behavior
#endif // Qt < 6.0.0
++start;
++analysis;
}
{
auto i_string = &_e->layoutData->string;
auto i_analysis = _parAnalysis.data() + (_localFrom - _parStart);
auto i_items = &_e->layoutData->items;
blockIndex = _lineStartBlock;
currentBlock = _t->_blocks[blockIndex].get();
nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
auto startBlock = currentBlock;
if (!length) {
return;
}
auto start = 0;
auto end = start + length;
for (int i = start + 1; i < end; ++i) {
while (nextBlock && nextBlock->from() <= _localFrom + i) {
currentBlock = nextBlock;
nextBlock = (++blockIndex < _blocksSize) ? _t->_blocks[blockIndex].get() : nullptr;
}
// According to the unicode spec we should be treating characters in the Common script
// (punctuation, spaces, etc) as being the same script as the surrounding text for the
// purpose of splitting up text. This is important because, for example, a fullstop
// (0x2E) can be used to indicate an abbreviation and so must be treated as part of a
// word. Thus it must be passed along with the word in languages that have to calculate
// word breaks. For example the thai word "[lookup-in-git]." has no word breaks
// but the word "[lookup-too]" does.
// Unfortuntely because we split up the strings for both wordwrapping and for setting
// the font and because Japanese and Chinese are also aliases of the script "Common",
// doing this would break too many things. So instead we only pass the full stop
// along, and nothing else.
if (currentBlock == startBlock
&& i_analysis[i].bidiLevel == i_analysis[start].bidiLevel
&& i_analysis[i].flags == i_analysis[start].flags
&& (i_analysis[i].script == i_analysis[start].script || i_string->at(i) == QLatin1Char('.'))
// && i_analysis[i].flags < QScriptAnalysis::SpaceTabOrObject // only emojis are objects here, no tabs
&& i - start < _MaxItemLength)
continue;
i_items->append(QScriptItem(start, i_analysis[start]));
start = i;
startBlock = currentBlock;
}
i_items->append(QScriptItem(start, i_analysis[start]));
}
}
QChar::Direction Renderer::eSkipBoundryNeutrals(QScriptAnalysis *analysis,
const ushort *unicode,
int &sor, int &eor, BidiControl &control,
String::TextBlocks::const_iterator i) {
String::TextBlocks::const_iterator e = _t->_blocks.cend(), n = i + 1;
QChar::Direction dir = control.basicDirection();
int level = sor > 0 ? analysis[sor - 1].bidiLevel : control.level;
while (sor <= _parLength) {
while (i != _parStartBlock && (*i)->from() > _parStart + sor) {
n = i;
--i;
}
while (n != e && (*n)->from() <= _parStart + sor) {
i = n;
++n;
}
TextBlockType _itype = (*i)->type();
if (eor == _parLength)
dir = control.basicDirection();
else if (_itype == TextBlockTEmoji
|| _itype == TextBlockTCustomEmoji)
dir = QChar::DirCS;
else if (_itype == TextBlockTSkip)
dir = QChar::DirCS;
else
dir = QChar::direction(unicode[sor]);
// Keep skipping DirBN as if it doesn't exist
if (dir != QChar::DirBN)
break;
analysis[sor++].bidiLevel = level;
}
eor = sor;
return dir;
}
// creates the next QScript items.
bool Renderer::eBidiItemize(QScriptAnalysis *analysis, BidiControl &control) {
bool rightToLeft = (control.basicDirection() == 1);
bool hasBidi = rightToLeft;
int sor = 0;
int eor = -1;
const ushort *unicode = reinterpret_cast<const ushort*>(_t->_text.unicode()) + _parStart;
int current = 0;
QChar::Direction dir = rightToLeft ? QChar::DirR : QChar::DirL;
BidiStatus status;
String::TextBlocks::const_iterator i = _parStartBlock, e = _t->_blocks.cend(), n = i + 1;
QChar::Direction sdir;
TextBlockType _stype = (*_parStartBlock)->type();
if (_stype == TextBlockTEmoji || _stype == TextBlockTCustomEmoji)
sdir = QChar::DirCS;
else if (_stype == TextBlockTSkip)
sdir = QChar::DirCS;
else
sdir = QChar::direction(*unicode);
if (sdir != QChar::DirL && sdir != QChar::DirR && sdir != QChar::DirEN && sdir != QChar::DirAN)
sdir = QChar::DirON;
else
dir = QChar::DirON;
status.eor = sdir;
status.lastStrong = rightToLeft ? QChar::DirR : QChar::DirL;
status.last = status.lastStrong;
status.dir = sdir;
while (current <= _parLength) {
while (n != e && (*n)->from() <= _parStart + current) {
i = n;
++n;
}
QChar::Direction dirCurrent;
TextBlockType _itype = (*i)->type();
if (current == (int)_parLength)
dirCurrent = control.basicDirection();
else if (_itype == TextBlockTEmoji
|| _itype == TextBlockTCustomEmoji)
dirCurrent = QChar::DirCS;
else if (_itype == TextBlockTSkip)
dirCurrent = QChar::DirCS;
else
dirCurrent = QChar::direction(unicode[current]);
switch (dirCurrent) {
// embedding and overrides (X1-X9 in the BiDi specs)
case QChar::DirRLE:
case QChar::DirRLO:
case QChar::DirLRE:
case QChar::DirLRO:
{
bool rtl = (dirCurrent == QChar::DirRLE || dirCurrent == QChar::DirRLO);
hasBidi |= rtl;
bool override = (dirCurrent == QChar::DirLRO || dirCurrent == QChar::DirRLO);
unsigned int level = control.level + 1;
if ((level % 2 != 0) == rtl) ++level;
if (level < _MaxBidiLevel) {
eor = current - 1;
eAppendItems(analysis, sor, eor, control, dir);
eor = current;
control.embed(rtl, override);
QChar::Direction edir = (rtl ? QChar::DirR : QChar::DirL);
dir = status.eor = edir;
status.lastStrong = edir;
}
break;
}
case QChar::DirPDF:
{
if (control.canPop()) {
if (dir != control.direction()) {
eor = current - 1;
eAppendItems(analysis, sor, eor, control, dir);
dir = control.direction();
}
eor = current;
eAppendItems(analysis, sor, eor, control, dir);
control.pdf();
dir = QChar::DirON; status.eor = QChar::DirON;
status.last = control.direction();
if (control.override)
dir = control.direction();
else
dir = QChar::DirON;
status.lastStrong = control.direction();
}
break;
}
// strong types
case QChar::DirL:
if (dir == QChar::DirON)
dir = QChar::DirL;
switch (status.last)
{
case QChar::DirL:
eor = current; status.eor = QChar::DirL; break;
case QChar::DirR:
case QChar::DirAL:
case QChar::DirEN:
case QChar::DirAN:
if (eor >= 0) {
eAppendItems(analysis, sor, eor, control, dir);
status.eor = dir = eSkipBoundryNeutrals(analysis, unicode, sor, eor, control, i);
} else {
eor = current; status.eor = dir;
}
break;
case QChar::DirES:
case QChar::DirET:
case QChar::DirCS:
case QChar::DirBN:
case QChar::DirB:
case QChar::DirS:
case QChar::DirWS:
case QChar::DirON:
if (dir != QChar::DirL) {
//last stuff takes embedding dir
if (control.direction() == QChar::DirR) {
if (status.eor != QChar::DirR) {
// AN or EN
eAppendItems(analysis, sor, eor, control, dir);
status.eor = QChar::DirON;
dir = QChar::DirR;
}
eor = current - 1;
eAppendItems(analysis, sor, eor, control, dir);
status.eor = dir = eSkipBoundryNeutrals(analysis, unicode, sor, eor, control, i);
} else {
if (status.eor != QChar::DirL) {
eAppendItems(analysis, sor, eor, control, dir);
status.eor = QChar::DirON;
dir = QChar::DirL;
} else {
eor = current; status.eor = QChar::DirL; break;
}
}
} else {
eor = current; status.eor = QChar::DirL;
}
default:
break;
}
status.lastStrong = QChar::DirL;
break;
case QChar::DirAL:
case QChar::DirR:
hasBidi = true;
if (dir == QChar::DirON) dir = QChar::DirR;
switch (status.last)
{
case QChar::DirL:
case QChar::DirEN:
case QChar::DirAN:
if (eor >= 0)
eAppendItems(analysis, sor, eor, control, dir);
// fall through
case QChar::DirR:
case QChar::DirAL:
dir = QChar::DirR; eor = current; status.eor = QChar::DirR; break;
case QChar::DirES:
case QChar::DirET:
case QChar::DirCS:
case QChar::DirBN:
case QChar::DirB:
case QChar::DirS:
case QChar::DirWS:
case QChar::DirON:
if (status.eor != QChar::DirR && status.eor != QChar::DirAL) {
//last stuff takes embedding dir
if (control.direction() == QChar::DirR
|| status.lastStrong == QChar::DirR || status.lastStrong == QChar::DirAL) {
eAppendItems(analysis, sor, eor, control, dir);
dir = QChar::DirR; status.eor = QChar::DirON;
eor = current;
} else {
eor = current - 1;
eAppendItems(analysis, sor, eor, control, dir);
dir = QChar::DirR; status.eor = QChar::DirON;
}
} else {
eor = current; status.eor = QChar::DirR;
}
default:
break;
}
status.lastStrong = dirCurrent;
break;
// weak types:
case QChar::DirNSM:
if (eor == current - 1)
eor = current;
break;
case QChar::DirEN:
// if last strong was AL change EN to AN
if (status.lastStrong != QChar::DirAL) {
if (dir == QChar::DirON) {
if (status.lastStrong == QChar::DirL)
dir = QChar::DirL;
else
dir = QChar::DirEN;
}
switch (status.last)
{
case QChar::DirET:
if (status.lastStrong == QChar::DirR || status.lastStrong == QChar::DirAL) {
eAppendItems(analysis, sor, eor, control, dir);
status.eor = QChar::DirON;
dir = QChar::DirAN;
}
[[fallthrough]];
case QChar::DirEN:
case QChar::DirL:
eor = current;
status.eor = dirCurrent;
break;
case QChar::DirR:
case QChar::DirAL:
case QChar::DirAN:
if (eor >= 0)
eAppendItems(analysis, sor, eor, control, dir);
else
eor = current;
status.eor = QChar::DirEN;
dir = QChar::DirAN;
break;
case QChar::DirES:
case QChar::DirCS:
if (status.eor == QChar::DirEN || dir == QChar::DirAN) {
eor = current; break;
}
[[fallthrough]];
case QChar::DirBN:
case QChar::DirB:
case QChar::DirS:
case QChar::DirWS:
case QChar::DirON:
if (status.eor == QChar::DirR) {
// neutrals go to R
eor = current - 1;
eAppendItems(analysis, sor, eor, control, dir);
status.eor = QChar::DirEN;
dir = QChar::DirAN;
} else if (status.eor == QChar::DirL ||
(status.eor == QChar::DirEN && status.lastStrong == QChar::DirL)) {
eor = current; status.eor = dirCurrent;
} else {
// numbers on both sides, neutrals get right to left direction
if (dir != QChar::DirL) {
eAppendItems(analysis, sor, eor, control, dir);
status.eor = QChar::DirON;
eor = current - 1;
dir = QChar::DirR;
eAppendItems(analysis, sor, eor, control, dir);
status.eor = QChar::DirON;
dir = QChar::DirAN;
} else {
eor = current; status.eor = dirCurrent;
}
}
[[fallthrough]];
default:
break;
}
break;
}
[[fallthrough]];
case QChar::DirAN:
hasBidi = true;
dirCurrent = QChar::DirAN;
if (dir == QChar::DirON) dir = QChar::DirAN;
switch (status.last)
{
case QChar::DirL:
case QChar::DirAN:
eor = current; status.eor = QChar::DirAN;
break;
case QChar::DirR:
case QChar::DirAL:
case QChar::DirEN:
if (eor >= 0) {
eAppendItems(analysis, sor, eor, control, dir);
} else {
eor = current;
}
dir = QChar::DirAN; status.eor = QChar::DirAN;
break;
case QChar::DirCS:
if (status.eor == QChar::DirAN) {
eor = current; break;
}
[[fallthrough]];
case QChar::DirES:
case QChar::DirET:
case QChar::DirBN:
case QChar::DirB:
case QChar::DirS:
case QChar::DirWS:
case QChar::DirON:
if (status.eor == QChar::DirR) {
// neutrals go to R
eor = current - 1;
eAppendItems(analysis, sor, eor, control, dir);
status.eor = QChar::DirAN;
dir = QChar::DirAN;
} else if (status.eor == QChar::DirL ||
(status.eor == QChar::DirEN && status.lastStrong == QChar::DirL)) {
eor = current; status.eor = dirCurrent;
} else {
// numbers on both sides, neutrals get right to left direction
if (dir != QChar::DirL) {
eAppendItems(analysis, sor, eor, control, dir);
status.eor = QChar::DirON;
eor = current - 1;
dir = QChar::DirR;
eAppendItems(analysis, sor, eor, control, dir);
status.eor = QChar::DirAN;
dir = QChar::DirAN;
} else {
eor = current; status.eor = dirCurrent;
}
}
[[fallthrough]];
default:
break;
}
break;
case QChar::DirES:
case QChar::DirCS:
break;
case QChar::DirET:
if (status.last == QChar::DirEN) {
dirCurrent = QChar::DirEN;
eor = current; status.eor = dirCurrent;
}
break;
// boundary neutrals should be ignored
case QChar::DirBN:
break;
// neutrals
case QChar::DirB:
// ### what do we do with newline and paragraph separators that come to here?
break;
case QChar::DirS:
// ### implement rule L1
break;
case QChar::DirWS:
case QChar::DirON:
break;
default:
break;
}
if (current >= (int)_parLength) break;
// set status.last as needed.
switch (dirCurrent) {
case QChar::DirET:
case QChar::DirES:
case QChar::DirCS:
case QChar::DirS:
case QChar::DirWS:
case QChar::DirON:
switch (status.last)
{
case QChar::DirL:
case QChar::DirR:
case QChar::DirAL:
case QChar::DirEN:
case QChar::DirAN:
status.last = dirCurrent;
break;
default:
status.last = QChar::DirON;
}
break;
case QChar::DirNSM:
case QChar::DirBN:
// ignore these
break;
case QChar::DirLRO:
case QChar::DirLRE:
status.last = QChar::DirL;
break;
case QChar::DirRLO:
case QChar::DirRLE:
status.last = QChar::DirR;
break;
case QChar::DirEN:
if (status.last == QChar::DirL) {
status.last = QChar::DirL;
break;
}
[[fallthrough]];
default:
status.last = dirCurrent;
}
++current;
}
eor = current - 1; // remove dummy char
if (sor <= eor)
eAppendItems(analysis, sor, eor, control, dir);
return hasBidi;
}
void Renderer::applyBlockProperties(const AbstractBlock *block) {
eSetFont(block);
if (_p) {
const auto isMono = IsMono(block->flags());
_background = {};
if (block->spoilerIndex() && _spoiler) {
_background.spoiler = true;
}
if (isMono
&& block->lnkIndex()
&& (!_background.spoiler || _spoiler->revealed)) {
_background.selectActiveBlock = ClickHandler::showAsPressed(
_t->_links.at(block->lnkIndex() - 1));
}
if (isMono) {
_currentPen = &_palette->monoFg->p;
_currentPenSelected = &_palette->selectMonoFg->p;
} else if (block->lnkIndex()
|| (block->flags() & TextBlockFPlainLink)) {
_currentPen = &_palette->linkFg->p;
_currentPenSelected = &_palette->selectLinkFg->p;
} else {
_currentPen = &_originalPen;
_currentPenSelected = &_originalPenSelected;
}
}
}
ClickHandlerPtr Renderer::lookupLink(const AbstractBlock *block) const {
const auto spoilerLink = (_spoiler
&& !_spoiler->revealed
&& block->spoilerIndex())
? _spoiler->link
: ClickHandlerPtr();
return (spoilerLink || !block->lnkIndex())
? spoilerLink
: _t->_links.at(block->lnkIndex() - 1);
}
} // namespace Ui::Text
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