354 lines
11 KiB
C++
354 lines
11 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2016 John Preston, https://desktop.telegram.org
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*/
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#include "stdafx.h"
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#include "ui/text/text_block.h"
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// COPIED FROM qtextlayout.cpp AND MODIFIED
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namespace {
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struct ScriptLine {
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ScriptLine() : length(0), textWidth(0) {
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}
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int32 length;
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QFixed textWidth;
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};
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// All members finished with "_" are internal.
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struct LineBreakHelper
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{
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LineBreakHelper()
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: glyphCount(0), maxGlyphs(INT_MAX), currentPosition(0), fontEngine(0), logClusters(0)
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{
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}
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ScriptLine tmpData;
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ScriptLine spaceData;
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QGlyphLayout glyphs;
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int glyphCount;
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int maxGlyphs;
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int currentPosition;
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glyph_t previousGlyph_ = 0;
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QFontEngine *previousFontEngine_ = nullptr;
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QFixed rightBearing;
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QFontEngine *fontEngine;
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const unsigned short *logClusters;
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inline glyph_t currentGlyph() const
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{
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Q_ASSERT(currentPosition > 0);
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Q_ASSERT(logClusters[currentPosition - 1] < glyphs.numGlyphs);
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return glyphs.glyphs[logClusters[currentPosition - 1]];
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}
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inline void saveCurrentGlyph()
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{
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if (currentPosition > 0 &&
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logClusters[currentPosition - 1] < glyphs.numGlyphs) {
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previousGlyph_ = currentGlyph(); // needed to calculate right bearing later
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previousFontEngine_ = fontEngine;
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} else {
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previousGlyph_ = 0;
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previousFontEngine_ = nullptr;
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}
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}
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inline void calculateRightBearing(QFontEngine *engine, glyph_t glyph)
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{
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qreal rb;
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engine->getGlyphBearings(glyph, 0, &rb);
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// We only care about negative right bearings, so we limit the range
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// of the bearing here so that we can assume it's negative in the rest
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// of the code, as well ase use QFixed(1) as a sentinel to represent
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// the state where we have yet to compute the right bearing.
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rightBearing = qMin(QFixed::fromReal(rb), QFixed(0));
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}
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inline void calculateRightBearing()
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{
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if (currentPosition > 0 &&
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logClusters[currentPosition - 1] < glyphs.numGlyphs) {
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calculateRightBearing(fontEngine, currentGlyph());
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} else {
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rightBearing = 0;
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}
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}
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inline void calculateRightBearingForPreviousGlyph()
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{
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if (previousGlyph_ > 0) {
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calculateRightBearing(previousFontEngine_, previousGlyph_);
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} else {
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rightBearing = 0;
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}
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}
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// We always calculate the right bearing right before it is needed.
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// So we don't need caching / optimizations referred to delayed right bearing calculations.
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//static const QFixed RightBearingNotCalculated;
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//inline void resetRightBearing()
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//{
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// rightBearing = RightBearingNotCalculated;
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//}
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// We express the negative right bearing as an absolute number
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// so that it can be applied to the width using addition.
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inline QFixed negativeRightBearing() const
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{
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//if (rightBearing == RightBearingNotCalculated)
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// return QFixed(0);
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return qAbs(rightBearing);
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}
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};
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//const QFixed LineBreakHelper::RightBearingNotCalculated = QFixed(1);
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static inline void addNextCluster(int &pos, int end, ScriptLine &line, int &glyphCount,
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const QScriptItem ¤t, const unsigned short *logClusters,
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const QGlyphLayout &glyphs)
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{
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int glyphPosition = logClusters[pos];
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do { // got to the first next cluster
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++pos;
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++line.length;
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} while (pos < end && logClusters[pos] == glyphPosition);
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do { // calculate the textWidth for the rest of the current cluster.
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if (!glyphs.attributes[glyphPosition].dontPrint)
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line.textWidth += glyphs.advances[glyphPosition];
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++glyphPosition;
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} while (glyphPosition < current.num_glyphs && !glyphs.attributes[glyphPosition].clusterStart);
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Q_ASSERT((pos == end && glyphPosition == current.num_glyphs) || logClusters[pos] == glyphPosition);
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++glyphCount;
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}
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} // anonymous namespace
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class BlockParser {
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public:
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BlockParser(QTextEngine *e, TextBlock *b, QFixed minResizeWidth, int32 blockFrom, const QString &str)
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: block(b), eng(e), str(str) {
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parseWords(minResizeWidth, blockFrom);
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}
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void parseWords(QFixed minResizeWidth, int32 blockFrom) {
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LineBreakHelper lbh;
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int item = -1;
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int newItem = eng->findItem(0);
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style::align alignment = eng->option.alignment();
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const QCharAttributes *attributes = eng->attributes();
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if (!attributes)
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return;
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int end = 0;
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lbh.logClusters = eng->layoutData->logClustersPtr;
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block->_lpadding = 0;
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block->_words.clear();
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int wordStart = lbh.currentPosition;
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bool addingEachGrapheme = false;
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int lastGraphemeBoundaryPosition = -1;
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ScriptLine lastGraphemeBoundaryLine;
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while (newItem < eng->layoutData->items.size()) {
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if (newItem != item) {
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item = newItem;
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const QScriptItem ¤t = eng->layoutData->items[item];
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if (!current.num_glyphs) {
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eng->shape(item);
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attributes = eng->attributes();
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if (!attributes)
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return;
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lbh.logClusters = eng->layoutData->logClustersPtr;
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}
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lbh.currentPosition = current.position;
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end = current.position + eng->length(item);
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lbh.glyphs = eng->shapedGlyphs(¤t);
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QFontEngine *fontEngine = eng->fontEngine(current);
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if (lbh.fontEngine != fontEngine) {
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lbh.fontEngine = fontEngine;
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}
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}
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const QScriptItem ¤t = eng->layoutData->items[item];
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if (attributes[lbh.currentPosition].whiteSpace) {
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while (lbh.currentPosition < end && attributes[lbh.currentPosition].whiteSpace)
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addNextCluster(lbh.currentPosition, end, lbh.spaceData, lbh.glyphCount,
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current, lbh.logClusters, lbh.glyphs);
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if (block->_words.isEmpty()) {
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block->_lpadding = lbh.spaceData.textWidth;
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} else {
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block->_words.back().add_rpadding(lbh.spaceData.textWidth);
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block->_width += lbh.spaceData.textWidth;
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}
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lbh.spaceData.length = 0;
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lbh.spaceData.textWidth = 0;
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wordStart = lbh.currentPosition;
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addingEachGrapheme = false;
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lastGraphemeBoundaryPosition = -1;
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lastGraphemeBoundaryLine = ScriptLine();
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} else {
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do {
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addNextCluster(lbh.currentPosition, end, lbh.tmpData, lbh.glyphCount,
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current, lbh.logClusters, lbh.glyphs);
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if (lbh.currentPosition >= eng->layoutData->string.length()
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|| attributes[lbh.currentPosition].whiteSpace
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|| isLineBreak(attributes, lbh.currentPosition)) {
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lbh.calculateRightBearing();
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block->_words.push_back(TextWord(wordStart + blockFrom, lbh.tmpData.textWidth, -lbh.negativeRightBearing()));
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block->_width += lbh.tmpData.textWidth;
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lbh.tmpData.textWidth = 0;
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lbh.tmpData.length = 0;
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wordStart = lbh.currentPosition;
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break;
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} else if (attributes[lbh.currentPosition].graphemeBoundary) {
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if (!addingEachGrapheme && lbh.tmpData.textWidth > minResizeWidth) {
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if (lastGraphemeBoundaryPosition >= 0) {
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lbh.calculateRightBearingForPreviousGlyph();
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block->_words.push_back(TextWord(wordStart + blockFrom, -lastGraphemeBoundaryLine.textWidth, -lbh.negativeRightBearing()));
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block->_width += lastGraphemeBoundaryLine.textWidth;
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lbh.tmpData.textWidth -= lastGraphemeBoundaryLine.textWidth;
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lbh.tmpData.length -= lastGraphemeBoundaryLine.length;
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wordStart = lastGraphemeBoundaryPosition;
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}
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addingEachGrapheme = true;
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}
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if (addingEachGrapheme) {
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lbh.calculateRightBearing();
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block->_words.push_back(TextWord(wordStart + blockFrom, -lbh.tmpData.textWidth, -lbh.negativeRightBearing()));
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block->_width += lbh.tmpData.textWidth;
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lbh.tmpData.textWidth = 0;
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lbh.tmpData.length = 0;
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wordStart = lbh.currentPosition;
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} else {
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lastGraphemeBoundaryPosition = lbh.currentPosition;
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lastGraphemeBoundaryLine = lbh.tmpData;
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lbh.saveCurrentGlyph();
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}
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}
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} while (lbh.currentPosition < end);
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}
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if (lbh.currentPosition == end)
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newItem = item + 1;
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}
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if (block->_words.isEmpty()) {
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block->_rpadding = 0;
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} else {
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block->_rpadding = block->_words.back().f_rpadding();
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block->_width -= block->_rpadding;
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block->_words.squeeze();
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}
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}
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bool isLineBreak(const QCharAttributes *attributes, int32 index) {
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bool lineBreak = attributes[index].lineBreak;
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if (lineBreak && block->lnkIndex() > 0 && index > 0 && str.at(index - 1) == '/') {
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return false; // don't break after / in links
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}
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return lineBreak;
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}
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private:
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TextBlock *block;
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QTextEngine *eng;
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const QString &str;
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};
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QFixed ITextBlock::f_rbearing() const {
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return (type() == TextBlockTText) ? static_cast<const TextBlock*>(this)->real_f_rbearing() : 0;
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}
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TextBlock::TextBlock(const style::font &font, const QString &str, QFixed minResizeWidth, uint16 from, uint16 length, uchar flags, const style::color &color, uint16 lnkIndex) : ITextBlock(font, str, from, length, flags, color, lnkIndex) {
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_flags |= ((TextBlockTText & 0x0F) << 8);
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if (length) {
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style::font blockFont = font;
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if (!flags && lnkIndex) {
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// should use textStyle lnkFlags somehow... not supported
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}
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if ((flags & TextBlockFPre) || (flags & TextBlockFCode)) {
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blockFont = App::monofont();
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if (blockFont->size() != font->size() || blockFont->flags() != font->flags()) {
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blockFont = style::font(font->size(), font->flags(), blockFont->family());
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}
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} else {
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if (flags & TextBlockFBold) {
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blockFont = blockFont->bold();
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} else if (flags & TextBlockFSemibold) {
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blockFont = st::semiboldFont;
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if (blockFont->size() != font->size() || blockFont->flags() != font->flags()) {
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blockFont = style::font(font->size(), font->flags(), blockFont->family());
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}
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}
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if (flags & TextBlockFItalic) blockFont = blockFont->italic();
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if (flags & TextBlockFUnderline) blockFont = blockFont->underline();
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if (flags & TextBlockFTilde) { // tilde fix in OpenSans
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blockFont = st::semiboldFont;
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}
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}
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QString part = str.mid(_from, length);
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QStackTextEngine engine(part, blockFont->f);
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engine.itemize();
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QTextLayout layout(&engine);
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layout.beginLayout();
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layout.createLine();
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BlockParser parser(&engine, this, minResizeWidth, _from, part);
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layout.endLayout();
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}
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}
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EmojiBlock::EmojiBlock(const style::font &font, const QString &str, uint16 from, uint16 length, uchar flags, const style::color &color, uint16 lnkIndex, const EmojiData *emoji) : ITextBlock(font, str, from, length, flags, color, lnkIndex), emoji(emoji) {
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_flags |= ((TextBlockTEmoji & 0x0F) << 8);
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_width = int(st::emojiSize + 2 * st::emojiPadding);
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}
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SkipBlock::SkipBlock(const style::font &font, const QString &str, uint16 from, int32 w, int32 h, uint16 lnkIndex) : ITextBlock(font, str, from, 1, 0, style::color(), lnkIndex), _height(h) {
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_flags |= ((TextBlockTSkip & 0x0F) << 8);
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_width = w;
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}
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