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127 lines
3.2 KiB
C++
127 lines
3.2 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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#include "ui/text/text.h"
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#include "ui/text/text_block.h"
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#include "ui/text/text_stack_engine.h"
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#include "ui/text/text_word.h"
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struct QGlyphLayout;
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struct QScriptItem;
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namespace Ui::Text {
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class WordParser {
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public:
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explicit WordParser(not_null<String*> string);
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private:
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struct ScriptLine {
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int length = 0;
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QFixed textWidth;
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};
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struct LineBreakHelper {
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ScriptLine tmpData;
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ScriptLine spaceData;
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QGlyphLayout glyphs;
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int glyphCount = 0;
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int maxGlyphs = INT_MAX;
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int currentPosition = 0;
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glyph_t previousGlyph = 0;
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QExplicitlySharedDataPointer<QFontEngine> previousGlyphFontEngine;
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QFixed rightBearing;
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QExplicitlySharedDataPointer<QFontEngine> fontEngine;
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const unsigned short *logClusters = nullptr;
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bool whiteSpaceOrObject = true;
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glyph_t currentGlyph() const;
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void saveCurrentGlyph();
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void calculateRightBearing(QFontEngine *engine, glyph_t glyph);
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void calculateRightBearing();
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void calculateRightBearingForPreviousGlyph();
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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
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// 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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QFixed negativeRightBearing() const;
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};
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struct BidiInitedAnalysis {
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explicit BidiInitedAnalysis(not_null<String*> text);
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QVarLengthArray<QScriptAnalysis, 4096> list;
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};
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void parse();
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const QCharAttributes *moveToNewItemGetAttributes();
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void pushAccumulatedWord();
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void processSingleGlyphItem(QFixed added = 0);
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void wordProcessed(int nextWordStart, bool spaces = false);
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void wordContinued(int nextPartStart, bool spaces = false);
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void accumulateWhitespaces();
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void ensureWordForRightPadding();
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void maybeStartUnfinishedWord();
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void pushFinishedWord(uint16 position, QFixed width, QFixed rbearing);
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void pushUnfinishedWord(uint16 position, QFixed width, QFixed rbearing);
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void pushNewline(uint16 position, int newlineBlockIndex);
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void addNextCluster(
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int &pos,
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int end,
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ScriptLine &line,
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int &glyphCount,
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const QScriptItem ¤t,
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const unsigned short *logClusters,
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const QGlyphLayout &glyphs);
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[[nodiscard]] bool isLineBreak(
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const QCharAttributes *attributes,
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int index) const;
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[[nodiscard]] bool isSpaceBreak(
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const QCharAttributes *attributes,
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int index) const;
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const not_null<String*> _t;
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QString &_tText;
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std::vector<Block> &_tBlocks;
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std::vector<Word> &_tWords;
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BidiInitedAnalysis _analysis;
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StackEngine _engine;
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QTextEngine &_e;
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LineBreakHelper _lbh;
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const QCharAttributes *_attributes = nullptr;
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int _wordStart = 0;
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bool _addingEachGrapheme = false;
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int _lastGraphemeBoundaryPosition = -1;
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ScriptLine _lastGraphemeBoundaryLine;
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int _item = -1;
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int _newItem = -1;
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int _itemEnd = 0;
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};
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} // namespace Ui::Text
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