1011 lines
30 KiB
C++
1011 lines
30 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 2002-2003, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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*/
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/*
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* paragraphLayout doesn't make much sense without
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* BreakIterator...
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*/
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#include "layout/LETypes.h"
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#include "layout/LELanguages.h"
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#include "layout/LayoutEngine.h"
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#include "layout/LEFontInstance.h"
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#include "unicode/ubidi.h"
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#include "unicode/uchriter.h"
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#include "unicode/brkiter.h"
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#if ! UCONFIG_NO_BREAK_ITERATION
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#include "LXUtilities.h"
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#include "usc_impl.h" /* this is currently private! */
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#include "cstring.h" /* this too! */
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#include "layout/ParagraphLayout.h"
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U_NAMESPACE_BEGIN
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#define ARRAY_SIZE(array) (sizeof array / sizeof array[0])
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class StyleRuns
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{
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public:
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StyleRuns(const RunArray *styleRunArrays[], le_int32 styleCount);
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~StyleRuns();
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le_int32 getRuns(le_int32 runLimits[], le_int32 styleIndices[]);
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private:
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le_int32 fStyleCount;
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le_int32 fRunCount;
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le_int32 *fRunLimits;
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le_int32 *fStyleIndices;
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};
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StyleRuns::StyleRuns(const RunArray *styleRunArrays[], le_int32 styleCount)
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: fStyleCount(styleCount), fRunCount(0), fRunLimits(NULL), fStyleIndices(NULL)
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{
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le_int32 maxRunCount = 0;
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le_int32 style, run, runStyle;
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le_int32 *currentRun = LE_NEW_ARRAY(le_int32, styleCount);
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for (int i = 0; i < styleCount; i += 1) {
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maxRunCount += styleRunArrays[i]->getCount();
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}
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maxRunCount -= styleCount - 1;
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fRunLimits = LE_NEW_ARRAY(le_int32, maxRunCount);
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fStyleIndices = LE_NEW_ARRAY(le_int32, maxRunCount * styleCount);
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for (style = 0; style < styleCount; style += 1) {
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currentRun[style] = 0;
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}
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run = 0;
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runStyle = 0;
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/*
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* Since the last run limit for each style run must be
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* the same, all the styles will hit the last limit at
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* the same time, so we know when we're done when the first
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* style hits the last limit.
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*/
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while (currentRun[0] < styleRunArrays[0]->getCount()) {
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fRunLimits[run] = 0x7FFFFFFF;
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// find the minimum run limit for all the styles
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for (style = 0; style < styleCount; style += 1) {
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if (styleRunArrays[style]->getLimit(currentRun[style]) < fRunLimits[run]) {
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fRunLimits[run] = styleRunArrays[style]->getLimit(currentRun[style]);
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}
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}
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// advance all styles whose current run is at this limit to the next run
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for (style = 0; style < styleCount; style += 1) {
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fStyleIndices[runStyle++] = currentRun[style];
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if (styleRunArrays[style]->getLimit(currentRun[style]) == fRunLimits[run]) {
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currentRun[style] += 1;
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}
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}
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run += 1;
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}
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fRunCount = run;
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LE_DELETE_ARRAY(currentRun);
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}
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StyleRuns::~StyleRuns()
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{
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fRunCount = 0;
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LE_DELETE_ARRAY(fStyleIndices);
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fStyleIndices = NULL;
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LE_DELETE_ARRAY(fRunLimits);
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fRunLimits = NULL;
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}
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le_int32 StyleRuns::getRuns(le_int32 runLimits[], le_int32 styleIndices[])
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{
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if (runLimits != NULL) {
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LE_ARRAY_COPY(runLimits, fRunLimits, fRunCount);
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}
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if (styleIndices != NULL) {
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LE_ARRAY_COPY(styleIndices, fStyleIndices, fRunCount * fStyleCount);
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}
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return fRunCount;
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}
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/*
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* NOTE: This table only has "true" values for
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* those scripts which the LayoutEngine can currently
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* process, rather for all scripts which require
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* complex processing for correct rendering.
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*/
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static const le_bool complexTable[] = {
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false , /* Zyyy */
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false, /* Qaai */
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true, /* Arab */
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false, /* Armn */
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true, /* Beng */
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false, /* Bopo */
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false, /* Cher */
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false, /* Qaac */
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false, /* Cyrl */
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false, /* Dsrt */
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true, /* Deva */
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false, /* Ethi */
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false, /* Geor */
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false, /* Goth */
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false, /* Grek */
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true, /* Gujr */
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true, /* Guru */
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false, /* Hani */
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false, /* Hang */
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true, /* Hebr */
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false, /* Hira */
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true, /* Knda */
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false, /* Kana */
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false, /* Khmr */
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false, /* Laoo */
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false, /* Latn */
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true, /* Mlym */
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false, /* Mong */
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false, /* Mymr */
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false, /* Ogam */
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false, /* Ital */
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true, /* Orya */
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false, /* Runr */
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false, /* Sinh */
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false, /* Syrc */
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true, /* Taml */
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true, /* Telu */
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false, /* Thaa */
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true, /* Thai */
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false, /* Tibt */
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false, /* Cans */
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false, /* Yiii */
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false, /* Tglg */
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false, /* Hano */
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false, /* Buhd */
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false, /* Tagb */
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false, /* Brai */
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false, /* Cprt */
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false, /* Limb */
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false, /* Linb */
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false, /* Osma */
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false, /* Shaw */
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false, /* Tale */
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false /* Ugar */
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};
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const char ParagraphLayout::fgClassID = 0;
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/*
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* How to deal with composite fonts:
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*
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* Don't store the client's FontRuns; we'll need to compute sub-font FontRuns using Doug's
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* LEFontInstance method. Do that by intersecting the client's FontRuns with fScriptRuns. Use
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* that to compute fFontRuns, and then intersect fFontRuns, fScriptRuns and fLevelRuns. Doing
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* it in this order means we do a two-way intersection and a three-way intersection.
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*
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* An optimization would be to only do this if there's at least one composite font...
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*
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* Other notes:
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*
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* * Return the sub-fonts as the run fonts... could keep the mapping back to the client's FontRuns
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* but that probably makes it more complicated of everyone...
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*
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* * Take the LineInfo and LineRun types from Paragraph and use them here, incorporate them into the API.
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*
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* * Might want to change the name of the StyleRun type, and make a new one that holds fonts, scripts and levels?
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*
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*/
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ParagraphLayout::ParagraphLayout(const LEUnicode chars[], le_int32 count,
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const FontRuns *fontRuns,
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const ValueRuns *levelRuns,
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const ValueRuns *scriptRuns,
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const LocaleRuns *localeRuns,
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UBiDiLevel paragraphLevel, le_bool vertical)
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: fChars(chars), fCharCount(count),
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fFontRuns(NULL), fLevelRuns(levelRuns), fScriptRuns(scriptRuns), fLocaleRuns(localeRuns),
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fVertical(vertical), fClientLevels(true), fClientScripts(true), fClientLocales(true), fEmbeddingLevels(NULL),
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fAscent(0), fDescent(0), fLeading(0),
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fGlyphToCharMap(NULL), fCharToGlyphMap(NULL), fGlyphWidths(NULL), fGlyphCount(0),
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fParaBidi(NULL), fLineBidi(NULL),
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fStyleRunLimits(NULL), fStyleIndices(NULL), fStyleRunCount(0),
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fBreakIterator(NULL), fLineStart(-1), fLineEnd(0),
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/*fVisualRuns(NULL), fStyleRunInfo(NULL), fVisualRunCount(-1),
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fFirstVisualRun(-1), fLastVisualRun(-1),*/ fVisualRunLastX(0), fVisualRunLastY(0)
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{
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// FIXME: should check the limit arrays for consistency...
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computeLevels(paragraphLevel);
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if (scriptRuns == NULL) {
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computeScripts();
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}
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if (localeRuns == NULL) {
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computeLocales();
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}
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computeSubFonts(fontRuns);
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// now intersect the font, direction and script runs...
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const RunArray *styleRunArrays[] = {fFontRuns, fLevelRuns, fScriptRuns, fLocaleRuns};
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le_int32 styleCount = sizeof styleRunArrays / sizeof styleRunArrays[0];
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StyleRuns styleRuns(styleRunArrays, styleCount);
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LEErrorCode layoutStatus = LE_NO_ERROR;
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fStyleRunCount = styleRuns.getRuns(NULL, NULL);
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fStyleRunLimits = LE_NEW_ARRAY(le_int32, fStyleRunCount);
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fStyleIndices = LE_NEW_ARRAY(le_int32, fStyleRunCount * styleCount);
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styleRuns.getRuns(fStyleRunLimits, fStyleIndices);
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// now build a LayoutEngine for each style run...
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le_int32 *styleIndices = fStyleIndices;
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le_int32 run, runStart;
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fStyleRunInfo = LE_NEW_ARRAY(StyleRunInfo, fStyleRunCount);
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fGlyphCount = 0;
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for (runStart = 0, run = 0; run < fStyleRunCount; run += 1) {
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fStyleRunInfo[run].font = fFontRuns->getFont(styleIndices[0]);
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fStyleRunInfo[run].runBase = runStart;
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fStyleRunInfo[run].runLimit = fStyleRunLimits[run];
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fStyleRunInfo[run].script = (UScriptCode) fScriptRuns->getValue(styleIndices[2]);
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fStyleRunInfo[run].locale = fLocaleRuns->getLocale(styleIndices[3]);
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fStyleRunInfo[run].level = (UBiDiLevel) fLevelRuns->getValue(styleIndices[1]);
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fStyleRunInfo[run].glyphBase = fGlyphCount;
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fStyleRunInfo[run].engine = LayoutEngine::layoutEngineFactory(fStyleRunInfo[run].font,
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fStyleRunInfo[run].script, getLanguageCode(fStyleRunInfo[run].locale), layoutStatus);
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fStyleRunInfo[run].glyphCount = fStyleRunInfo[run].engine->layoutChars(fChars, runStart, fStyleRunLimits[run] - runStart, fCharCount,
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fStyleRunInfo[run].level & 1, 0, 0, layoutStatus);
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runStart = fStyleRunLimits[run];
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styleIndices += styleCount;
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fGlyphCount += fStyleRunInfo[run].glyphCount;
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}
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// Make big arrays for the glyph widths, glyph-to-char and char-to-glyph maps,
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// in logical order. (Both maps need an extra entry for the end of the text.)
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//
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// For each layout get the positions and convert them into glyph widths, in
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// logical order. Get the glyph-to-char mapping, offset by starting index in the
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// width array, and swap it into logical order. Then fill in the char-to-glyph map
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// from this. (charToGlyph[glyphToChar[i]] = i)
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fGlyphWidths = LE_NEW_ARRAY(float, fGlyphCount);
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fGlyphToCharMap = LE_NEW_ARRAY(le_int32, fGlyphCount + 1);
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fCharToGlyphMap = LE_NEW_ARRAY(le_int32, fCharCount + 1);
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for (runStart = 0, run = 0; run < fStyleRunCount; run += 1) {
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LayoutEngine *engine = fStyleRunInfo[run].engine;
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le_int32 glyphCount = fStyleRunInfo[run].glyphCount;
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le_int32 glyphBase = fStyleRunInfo[run].glyphBase;
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le_int32 glyph;
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fStyleRunInfo[run].glyphs = LE_NEW_ARRAY(LEGlyphID, glyphCount);
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fStyleRunInfo[run].positions = LE_NEW_ARRAY(float, glyphCount * 2 + 2);
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engine->getGlyphs(fStyleRunInfo[run].glyphs, layoutStatus);
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engine->getGlyphPositions(fStyleRunInfo[run].positions, layoutStatus);
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engine->getCharIndices(&fGlyphToCharMap[glyphBase], runStart, layoutStatus);
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for (glyph = 0; glyph < glyphCount; glyph += 1) {
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fGlyphWidths[glyphBase + glyph] = fStyleRunInfo[run].positions[glyph * 2 + 2] - fStyleRunInfo[run].positions[glyph * 2];
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fCharToGlyphMap[fGlyphToCharMap[glyphBase + glyph]] = glyphBase + glyph;
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}
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if ((fStyleRunInfo[run].level & 1) != 0) {
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LXUtilities::reverse(&fGlyphWidths[glyphBase], glyphCount);
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LXUtilities::reverse(&fGlyphToCharMap[glyphBase], glyphCount);
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// LXUtilities::reverse(&fCharToGlyphMap[runStart], fStyleRunLimits[run] - runStart);
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// convert from visual to logical glyph indices
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for (glyph = glyphBase; glyph < glyphBase + glyphCount; glyph += 1) {
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le_int32 ch = fGlyphToCharMap[glyph];
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le_int32 lastGlyph = glyphBase + glyphCount - 1;
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// both lastGlyph and fCharToGlyphMap[ch] are biased by
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// glyphBase, so subtracting them will remove the bias.
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fCharToGlyphMap[ch] = lastGlyph - fCharToGlyphMap[ch] + glyphBase;
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}
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}
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runStart = fStyleRunLimits[run];
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delete engine;
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fStyleRunInfo[run].engine = NULL;
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}
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fCharToGlyphMap[fCharCount] = fGlyphCount;
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fGlyphToCharMap[fGlyphCount] = fCharCount;
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}
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ParagraphLayout::~ParagraphLayout()
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{
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delete (FontRuns *) fFontRuns;
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if (! fClientLevels) {
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delete (ValueRuns *) fLevelRuns;
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fLevelRuns = NULL;
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fClientLevels = true;
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}
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if (! fClientScripts) {
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delete (ValueRuns *) fScriptRuns;
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fScriptRuns = NULL;
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fClientScripts = true;
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}
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if (! fClientLocales) {
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delete (LocaleRuns *) fLocaleRuns;
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fLocaleRuns = NULL;
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fClientLocales = true;
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}
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if (fEmbeddingLevels != NULL) {
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LE_DELETE_ARRAY(fEmbeddingLevels);
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fEmbeddingLevels = NULL;
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}
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if (fGlyphToCharMap != NULL) {
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LE_DELETE_ARRAY(fGlyphToCharMap);
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fGlyphToCharMap = NULL;
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}
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if (fCharToGlyphMap != NULL) {
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LE_DELETE_ARRAY(fCharToGlyphMap);
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fCharToGlyphMap = NULL;
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}
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if (fGlyphWidths != NULL) {
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LE_DELETE_ARRAY(fGlyphWidths);
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fGlyphWidths = NULL;
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}
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if (fParaBidi != NULL) {
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ubidi_close(fParaBidi);
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fParaBidi = NULL;
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}
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if (fLineBidi != NULL) {
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ubidi_close(fLineBidi);
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fLineBidi = NULL;
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}
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if (fStyleRunCount > 0) {
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le_int32 run;
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LE_DELETE_ARRAY(fStyleRunLimits);
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LE_DELETE_ARRAY(fStyleIndices);
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for (run = 0; run < fStyleRunCount; run += 1) {
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LE_DELETE_ARRAY(fStyleRunInfo[run].glyphs);
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LE_DELETE_ARRAY(fStyleRunInfo[run].positions);
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fStyleRunInfo[run].glyphs = NULL;
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fStyleRunInfo[run].positions = NULL;
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}
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LE_DELETE_ARRAY(fStyleRunInfo);
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fStyleRunLimits = NULL;
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fStyleIndices = NULL;
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fStyleRunInfo = NULL;
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fStyleRunCount = 0;
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}
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if (fBreakIterator != NULL) {
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delete fBreakIterator;
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fBreakIterator = NULL;
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}
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}
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le_bool ParagraphLayout::isComplex(const LEUnicode chars[], le_int32 count)
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{
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UErrorCode scriptStatus = U_ZERO_ERROR;
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UScriptCode scriptCode = USCRIPT_INVALID_CODE;
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UScriptRun *sr = uscript_openRun(chars, count, &scriptStatus);
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while (uscript_nextRun(sr, NULL, NULL, &scriptCode)) {
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if (isComplex(scriptCode)) {
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return true;
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}
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}
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return false;
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}
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le_int32 ParagraphLayout::getAscent() const
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{
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if (fAscent <= 0) {
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((ParagraphLayout *) this)->computeMetrics();
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}
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return fAscent;
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}
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le_int32 ParagraphLayout::getDescent() const
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{
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if (fAscent <= 0) {
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((ParagraphLayout *) this)->computeMetrics();
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}
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return fDescent;
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}
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le_int32 ParagraphLayout::getLeading() const
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{
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if (fAscent <= 0) {
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((ParagraphLayout *) this)->computeMetrics();
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}
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return fLeading;
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}
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ParagraphLayout::Line *ParagraphLayout::nextLine(float width)
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{
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if (fLineEnd >= fCharCount) {
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return NULL;
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}
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fLineStart = fLineEnd;
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if (width > 0) {
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le_int32 glyph = fCharToGlyphMap[fLineStart];
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float widthSoFar = 0;
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while (glyph < fGlyphCount && widthSoFar + fGlyphWidths[glyph] <= width) {
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widthSoFar += fGlyphWidths[glyph++];
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}
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// If no glyphs fit on the line, force one to fit.
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//
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// (There shouldn't be any zero width glyphs at the
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// start of a line unless the paragraph consists of
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// only zero width glyphs, because otherwise the zero
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// width glyphs will have been included on the end of
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// the previous line...)
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if (widthSoFar == 0 && glyph < fGlyphCount) {
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glyph += 1;
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}
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fLineEnd = previousBreak(fGlyphToCharMap[glyph]);
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// If there's no real break, break at the
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// glyph that didn't fit.
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if (fLineEnd <= fLineStart) {
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fLineEnd = fGlyphToCharMap[glyph];
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}
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} else {
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fLineEnd = fCharCount;
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}
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return computeVisualRuns();
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}
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void ParagraphLayout::computeLevels(UBiDiLevel paragraphLevel)
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{
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UErrorCode bidiStatus = U_ZERO_ERROR;
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if (fLevelRuns != NULL) {
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le_int32 ch;
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le_int32 run;
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fEmbeddingLevels = LE_NEW_ARRAY(UBiDiLevel, fCharCount);
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|
|
|
for (ch = 0, run = 0; run < fLevelRuns->getCount(); run += 1) {
|
|
UBiDiLevel runLevel = (UBiDiLevel) fLevelRuns->getValue(run) | UBIDI_LEVEL_OVERRIDE;
|
|
le_int32 runLimit = fLevelRuns->getLimit(run);
|
|
|
|
while (ch < runLimit) {
|
|
fEmbeddingLevels[ch++] = runLevel;
|
|
}
|
|
}
|
|
}
|
|
|
|
fParaBidi = ubidi_openSized(fCharCount, 0, &bidiStatus);
|
|
ubidi_setPara(fParaBidi, fChars, fCharCount, paragraphLevel, fEmbeddingLevels, &bidiStatus);
|
|
|
|
if (fLevelRuns == NULL) {
|
|
le_int32 levelRunCount = ubidi_countRuns(fParaBidi, &bidiStatus);
|
|
ValueRuns *levelRuns = new ValueRuns(levelRunCount);
|
|
|
|
le_int32 logicalStart = 0;
|
|
le_int32 run;
|
|
le_int32 limit;
|
|
UBiDiLevel level;
|
|
|
|
for (run = 0; run < levelRunCount; run += 1) {
|
|
ubidi_getLogicalRun(fParaBidi, logicalStart, &limit, &level);
|
|
levelRuns->add(level, limit);
|
|
logicalStart = limit;
|
|
}
|
|
|
|
fLevelRuns = levelRuns;
|
|
fClientLevels = false;
|
|
}
|
|
}
|
|
|
|
void ParagraphLayout::computeScripts()
|
|
{
|
|
UErrorCode scriptStatus = U_ZERO_ERROR;
|
|
UScriptRun *sr = uscript_openRun(fChars, fCharCount, &scriptStatus);
|
|
ValueRuns *scriptRuns = new ValueRuns(0);
|
|
le_int32 limit;
|
|
UScriptCode script;
|
|
|
|
while (uscript_nextRun(sr, NULL, &limit, &script)) {
|
|
scriptRuns->add(script, limit);
|
|
}
|
|
|
|
uscript_closeRun(sr);
|
|
|
|
fScriptRuns = scriptRuns;
|
|
fClientScripts = false;
|
|
}
|
|
|
|
void ParagraphLayout::computeLocales()
|
|
{
|
|
LocaleRuns *localeRuns = new LocaleRuns(0);
|
|
const Locale *defaultLocale = &Locale::getDefault();
|
|
|
|
localeRuns->add(defaultLocale, fCharCount);
|
|
|
|
fLocaleRuns = localeRuns;
|
|
fClientLocales = false;
|
|
}
|
|
|
|
void ParagraphLayout::computeSubFonts(const FontRuns *fontRuns)
|
|
{
|
|
const RunArray *styleRunArrays[] = {fontRuns, fScriptRuns};
|
|
le_int32 styleCount = sizeof styleRunArrays / sizeof styleRunArrays[0];
|
|
StyleRuns styleRuns(styleRunArrays, styleCount);
|
|
le_int32 styleRunCount = styleRuns.getRuns(NULL, NULL);
|
|
le_int32 *styleRunLimits = LE_NEW_ARRAY(le_int32, styleRunCount);
|
|
le_int32 *styleIndices = LE_NEW_ARRAY(le_int32, styleRunCount * styleCount);
|
|
FontRuns *subFontRuns = new FontRuns(0);
|
|
le_int32 run, offset, *si;
|
|
|
|
styleRuns.getRuns(styleRunLimits, styleIndices);
|
|
|
|
si = styleIndices;
|
|
offset = 0;
|
|
|
|
for (run = 0; run < styleRunCount; run += 1) {
|
|
const LEFontInstance *runFont = fontRuns->getFont(si[0]);
|
|
le_int32 script = fScriptRuns->getValue(si[1]);
|
|
LEErrorCode success = LE_NO_ERROR;
|
|
|
|
while (offset < styleRunLimits[run]) {
|
|
const LEFontInstance *subFont = runFont->getSubFont(fChars, &offset, styleRunLimits[run], script, success);
|
|
|
|
subFontRuns->add(subFont, offset);
|
|
}
|
|
|
|
si += styleCount;
|
|
}
|
|
|
|
fFontRuns = subFontRuns;
|
|
|
|
LE_DELETE_ARRAY(styleIndices);
|
|
LE_DELETE_ARRAY(styleRunLimits);
|
|
}
|
|
|
|
void ParagraphLayout::computeMetrics()
|
|
{
|
|
le_int32 i, count = fFontRuns->getCount();
|
|
le_int32 maxDL = 0;
|
|
|
|
for (i = 0; i < count; i += 1) {
|
|
const LEFontInstance *font = fFontRuns->getFont(i);
|
|
le_int32 ascent = font->getAscent();
|
|
le_int32 descent = font->getDescent();
|
|
le_int32 leading = font->getLeading();
|
|
le_int32 dl = descent + leading;
|
|
|
|
if (ascent > fAscent) {
|
|
fAscent = ascent;
|
|
}
|
|
|
|
if (descent > fDescent) {
|
|
fDescent = descent;
|
|
}
|
|
|
|
if (leading > fLeading) {
|
|
fLeading = leading;
|
|
}
|
|
|
|
if (dl > maxDL) {
|
|
maxDL = dl;
|
|
}
|
|
}
|
|
|
|
fLeading = maxDL - fDescent;
|
|
}
|
|
|
|
#if 1
|
|
struct LanguageMap
|
|
{
|
|
const char *localeCode;
|
|
le_int32 languageCode;
|
|
};
|
|
|
|
static const LanguageMap languageMap[] =
|
|
{
|
|
{"ara", araLanguageCode}, // Arabic
|
|
{"asm", asmLanguageCode}, // Assamese
|
|
{"ben", benLanguageCode}, // Bengali
|
|
{"fas", farLanguageCode}, // Farsi
|
|
{"guj", gujLanguageCode}, // Gujarati
|
|
{"heb", iwrLanguageCode}, // Hebrew
|
|
{"hin", hinLanguageCode}, // Hindi
|
|
{"jpn", janLanguageCode}, // Japanese
|
|
{"kan", kanLanguageCode}, // Kannada
|
|
{"kas", kshLanguageCode}, // Kashmiri
|
|
{"kok", kokLanguageCode}, // Konkani
|
|
{"kor", korLanguageCode}, // Korean
|
|
// {"mal_XXX", malLanguageCode}, // Malayalam - Traditional
|
|
{"mal", mlrLanguageCode}, // Malayalam - Reformed
|
|
{"mar", marLanguageCode}, // Marathi
|
|
{"mni", mniLanguageCode}, // Manipuri
|
|
{"ori", oriLanguageCode}, // Oriya
|
|
{"san", sanLanguageCode}, // Sanskrit
|
|
{"snd", sndLanguageCode}, // Sindhi
|
|
{"sin", snhLanguageCode}, // Sinhalese
|
|
{"syr", syrLanguageCode}, // Syriac
|
|
{"tam", tamLanguageCode}, // Tamil
|
|
{"tel", telLanguageCode}, // Telugu
|
|
{"tha", thaLanguageCode}, // Thai
|
|
{"urd", urdLanguageCode}, // Urdu
|
|
{"yid", jiiLanguageCode}, // Yiddish
|
|
// {"zhp", zhpLanguageCode}, // Chinese - Phonetic
|
|
{"zho", zhsLanguageCode}, // Chinese
|
|
{"zho_CHN", zhsLanguageCode}, // Chinese - China
|
|
{"zho_HKG", zhsLanguageCode}, // Chinese - Hong Kong
|
|
{"zho_MAC", zhtLanguageCode}, // Chinese - Macao
|
|
{"zho_SGP", zhsLanguageCode}, // Chinese - Singapore
|
|
{"zho_TWN", zhtLanguageCode} // Chinese - Taiwan
|
|
};
|
|
|
|
static const le_int32 languageMapCount = ARRAY_SIZE(languageMap);
|
|
|
|
le_int32 ParagraphLayout::getLanguageCode(const Locale *locale)
|
|
{
|
|
char code[8] = {0, 0, 0, 0, 0, 0, 0, 0};
|
|
const char *language = locale->getISO3Language();
|
|
const char *country = locale->getISO3Country();
|
|
|
|
uprv_strcat(code, language);
|
|
|
|
if ((uprv_strcmp(language, "zho") == 0) && country != NULL) {
|
|
uprv_strcat(code, "_");
|
|
uprv_strcat(code, country);
|
|
}
|
|
|
|
for (le_int32 i = 0; i < languageMapCount; i += 1) {
|
|
if (uprv_strcmp(code, languageMap[i].localeCode) == 0) {
|
|
return languageMap[i].languageCode;
|
|
}
|
|
}
|
|
|
|
return nullLanguageCode;
|
|
}
|
|
#elif
|
|
|
|
// TODO - dummy implementation for right now...
|
|
le_int32 ParagraphLayout::getLanguageCode(const Locale *locale)
|
|
{
|
|
return nullLanguageCode;
|
|
}
|
|
#endif
|
|
|
|
le_bool ParagraphLayout::isComplex(UScriptCode script)
|
|
{
|
|
if (script < 0 || script >= USCRIPT_CODE_LIMIT) {
|
|
return false;
|
|
}
|
|
|
|
return complexTable[script];
|
|
}
|
|
|
|
le_int32 ParagraphLayout::previousBreak(le_int32 charIndex)
|
|
{
|
|
// skip over any whitespace or control characters,
|
|
// because they can hang in the margin.
|
|
while (charIndex < fCharCount &&
|
|
(u_isWhitespace(fChars[charIndex]) ||
|
|
u_iscntrl(fChars[charIndex]))) {
|
|
charIndex += 1;
|
|
}
|
|
|
|
// Create the BreakIterator if we don't already have one
|
|
if (fBreakIterator == NULL) {
|
|
Locale thai("th");
|
|
UCharCharacterIterator *iter = new UCharCharacterIterator(fChars, fCharCount);
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
|
|
fBreakIterator = BreakIterator::createLineInstance(thai, status);
|
|
fBreakIterator->adoptText(iter);
|
|
}
|
|
|
|
// return the break location that's at or before
|
|
// the character we stopped on. Note: if we're
|
|
// on a break, the "+ 1" will cause preceding to
|
|
// back up to it.
|
|
return fBreakIterator->preceding(charIndex + 1);
|
|
}
|
|
|
|
ParagraphLayout::Line *ParagraphLayout::computeVisualRuns()
|
|
{
|
|
UErrorCode bidiStatus = U_ZERO_ERROR;
|
|
le_int32 dirRunCount, visualRun;
|
|
|
|
fVisualRunLastX = 0;
|
|
fVisualRunLastY = 0;
|
|
fFirstVisualRun = getCharRun(fLineStart);
|
|
fLastVisualRun = getCharRun(fLineEnd - 1);
|
|
|
|
if (fLineBidi == NULL) {
|
|
fLineBidi = ubidi_openSized(fCharCount, 0, &bidiStatus);
|
|
}
|
|
|
|
ubidi_setLine(fParaBidi, fLineStart, fLineEnd, fLineBidi, &bidiStatus);
|
|
dirRunCount = ubidi_countRuns(fLineBidi, &bidiStatus);
|
|
|
|
Line *line = new Line();
|
|
|
|
for (visualRun = 0; visualRun < dirRunCount; visualRun += 1) {
|
|
le_int32 relStart, run, runLength;
|
|
UBiDiDirection runDirection = ubidi_getVisualRun(fLineBidi, visualRun, &relStart, &runLength);
|
|
le_int32 runStart = fLineStart + relStart;
|
|
le_int32 runEnd = runStart + runLength - 1;
|
|
le_int32 firstRun = getCharRun(runStart);
|
|
le_int32 lastRun = getCharRun(runEnd);
|
|
le_int32 startRun = (runDirection == UBIDI_LTR)? firstRun : lastRun;
|
|
le_int32 stopRun = (runDirection == UBIDI_LTR)? lastRun + 1 : firstRun - 1;
|
|
le_int32 dir = (runDirection == UBIDI_LTR)? 1 : -1;
|
|
|
|
for (run = startRun; run != stopRun; run += dir) {
|
|
le_int32 firstChar = (run == firstRun)? runStart : fStyleRunInfo[run].runBase;
|
|
le_int32 lastChar = (run == lastRun)? runEnd : fStyleRunInfo[run].runLimit - 1;
|
|
|
|
appendRun(line, run, firstChar, lastChar);
|
|
}
|
|
}
|
|
|
|
return line;
|
|
}
|
|
|
|
void ParagraphLayout::appendRun(ParagraphLayout::Line *line, le_int32 run, le_int32 firstChar, le_int32 lastChar)
|
|
{
|
|
le_int32 glyphBase = fStyleRunInfo[run].glyphBase;
|
|
le_int32 inGlyph, outGlyph;
|
|
|
|
// Get the glyph indices for all the characters between firstChar and lastChar,
|
|
// make the minimum one be leftGlyph and the maximum one be rightGlyph.
|
|
// (need to do this to handle local reorderings like Indic left matras)
|
|
le_int32 leftGlyph = fGlyphCount;
|
|
le_int32 rightGlyph = -1;
|
|
le_int32 ch;
|
|
|
|
for (ch = firstChar; ch <= lastChar; ch += 1) {
|
|
le_int32 glyph = fCharToGlyphMap[ch];
|
|
|
|
if (glyph < leftGlyph) {
|
|
leftGlyph = glyph;
|
|
}
|
|
|
|
if (glyph > rightGlyph) {
|
|
rightGlyph = glyph;
|
|
}
|
|
}
|
|
|
|
if ((fStyleRunInfo[run].level & 1) != 0) {
|
|
le_int32 swap = rightGlyph;
|
|
le_int32 last = glyphBase + fStyleRunInfo[run].glyphCount - 1;
|
|
|
|
// Here, we want to remove the glyphBase bias...
|
|
rightGlyph = last - leftGlyph;
|
|
leftGlyph = last - swap;
|
|
} else {
|
|
rightGlyph -= glyphBase;
|
|
leftGlyph -= glyphBase;
|
|
}
|
|
|
|
// Set the position bias for the glyphs. If we're at the start of
|
|
// a line, we want the first glyph to be at x = 0, even if it comes
|
|
// from the middle of a layout. If we've got a right-to-left run, we
|
|
// want the left-most glyph to start at the final x position of the
|
|
// previous run, even though this glyph may be in the middle of the
|
|
// run.
|
|
fVisualRunLastX -= fStyleRunInfo[run].positions[leftGlyph * 2];
|
|
|
|
// Make rightGlyph be the glyph just to the right of
|
|
// the run's glyphs
|
|
rightGlyph += 1;
|
|
|
|
UBiDiDirection direction = ((fStyleRunInfo[run].level & 1) == 0)? UBIDI_LTR : UBIDI_RTL;
|
|
le_int32 glyphCount = rightGlyph - leftGlyph;
|
|
LEGlyphID *glyphs = LE_NEW_ARRAY(LEGlyphID, glyphCount);
|
|
float *positions = LE_NEW_ARRAY(float, glyphCount * 2 + 2);
|
|
le_int32 *glyphToCharMap = LE_NEW_ARRAY(le_int32, glyphCount);
|
|
|
|
LE_ARRAY_COPY(glyphs, &fStyleRunInfo[run].glyphs[leftGlyph], glyphCount);
|
|
|
|
for (outGlyph = 0, inGlyph = leftGlyph * 2; inGlyph <= rightGlyph * 2; inGlyph += 2, outGlyph += 2) {
|
|
positions[outGlyph] = fStyleRunInfo[run].positions[inGlyph] + fVisualRunLastX;
|
|
positions[outGlyph + 1] = fStyleRunInfo[run].positions[inGlyph + 1] /* + fVisualRunLastY */;
|
|
}
|
|
|
|
// Save the ending position of this run
|
|
// to use for the start of the next run
|
|
fVisualRunLastX = positions[outGlyph - 2];
|
|
// fVisualRunLastY = positions[rightGlyph * 2 + 2];
|
|
|
|
if ((fStyleRunInfo[run].level & 1) == 0) {
|
|
for (outGlyph = 0, inGlyph = leftGlyph; inGlyph < rightGlyph; inGlyph += 1, outGlyph += 1) {
|
|
glyphToCharMap[outGlyph] = fGlyphToCharMap[glyphBase + inGlyph];
|
|
}
|
|
} else {
|
|
for (outGlyph = 0, inGlyph = rightGlyph - 1; inGlyph >= leftGlyph; inGlyph -= 1, outGlyph += 1) {
|
|
glyphToCharMap[outGlyph] = fGlyphToCharMap[glyphBase + inGlyph];
|
|
}
|
|
}
|
|
|
|
line->append(fStyleRunInfo[run].font, direction, glyphCount, glyphs, positions, glyphToCharMap);
|
|
}
|
|
|
|
le_int32 ParagraphLayout::getCharRun(le_int32 charIndex)
|
|
{
|
|
if (charIndex < 0 || charIndex > fCharCount) {
|
|
return -1;
|
|
}
|
|
|
|
le_int32 run;
|
|
|
|
// NOTE: as long as fStyleRunLimits is well-formed
|
|
// the above range check guarantees that we'll never
|
|
// fall off the end of the array.
|
|
run = 0;
|
|
while (charIndex >= fStyleRunLimits[run]) {
|
|
run += 1;
|
|
}
|
|
|
|
return run;
|
|
}
|
|
|
|
|
|
const char ParagraphLayout::Line::fgClassID = 0;
|
|
|
|
#define INITIAL_RUN_CAPACITY 4
|
|
#define RUN_CAPACITY_GROW_LIMIT 16
|
|
|
|
ParagraphLayout::Line::~Line()
|
|
{
|
|
le_int32 i;
|
|
|
|
for (i = 0; i < fRunCount; i += 1) {
|
|
delete fRuns[i];
|
|
}
|
|
|
|
LE_DELETE_ARRAY(fRuns);
|
|
}
|
|
|
|
le_int32 ParagraphLayout::Line::getAscent() const
|
|
{
|
|
if (fAscent <= 0) {
|
|
((ParagraphLayout::Line *)this)->computeMetrics();
|
|
}
|
|
|
|
return fAscent;
|
|
}
|
|
|
|
le_int32 ParagraphLayout::Line::getDescent() const
|
|
{
|
|
if (fAscent <= 0) {
|
|
((ParagraphLayout::Line *)this)->computeMetrics();
|
|
}
|
|
|
|
return fDescent;
|
|
}
|
|
|
|
le_int32 ParagraphLayout::Line::getLeading() const
|
|
{
|
|
if (fAscent <= 0) {
|
|
((ParagraphLayout::Line *)this)->computeMetrics();
|
|
}
|
|
|
|
return fLeading;
|
|
}
|
|
|
|
const ParagraphLayout::VisualRun *ParagraphLayout::Line::getVisualRun(le_int32 runIndex) const
|
|
{
|
|
if (runIndex < 0 || runIndex >= fRunCount) {
|
|
return NULL;
|
|
}
|
|
|
|
return fRuns[runIndex];
|
|
}
|
|
|
|
void ParagraphLayout::Line::append(const LEFontInstance *font, UBiDiDirection direction, le_int32 glyphCount,
|
|
const LEGlyphID glyphs[], const float positions[], const le_int32 glyphToCharMap[])
|
|
{
|
|
if (fRunCount >= fRunCapacity) {
|
|
if (fRunCapacity == 0) {
|
|
fRunCapacity = INITIAL_RUN_CAPACITY;
|
|
fRuns = LE_NEW_ARRAY(ParagraphLayout::VisualRun *, fRunCapacity);
|
|
} else {
|
|
fRunCapacity += (fRunCapacity < RUN_CAPACITY_GROW_LIMIT? fRunCapacity : RUN_CAPACITY_GROW_LIMIT);
|
|
fRuns = (ParagraphLayout::VisualRun **) LE_GROW_ARRAY(fRuns, fRunCapacity);
|
|
}
|
|
}
|
|
|
|
fRuns[fRunCount++] = new ParagraphLayout::VisualRun(font, direction, glyphCount, glyphs, positions, glyphToCharMap);
|
|
}
|
|
|
|
void ParagraphLayout::Line::computeMetrics()
|
|
{
|
|
le_int32 maxDL = 0;
|
|
|
|
for (le_int32 i = 0; i < fRunCount; i += 1) {
|
|
le_int32 ascent = fRuns[i]->getAscent();
|
|
le_int32 descent = fRuns[i]->getDescent();
|
|
le_int32 leading = fRuns[i]->getLeading();
|
|
le_int32 dl = descent + leading;
|
|
|
|
if (ascent > fAscent) {
|
|
fAscent = ascent;
|
|
}
|
|
|
|
if (descent > fDescent) {
|
|
fDescent = descent;
|
|
}
|
|
|
|
if (leading > fLeading) {
|
|
fLeading = leading;
|
|
}
|
|
|
|
if (dl > maxDL) {
|
|
maxDL = dl;
|
|
}
|
|
}
|
|
|
|
fLeading = maxDL - fDescent;
|
|
}
|
|
|
|
const char ParagraphLayout::VisualRun::fgClassID = 0;
|
|
|
|
ParagraphLayout::VisualRun::~VisualRun()
|
|
{
|
|
LE_DELETE_ARRAY(fGlyphToCharMap);
|
|
LE_DELETE_ARRAY(fPositions);
|
|
LE_DELETE_ARRAY(fGlyphs);
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif
|
|
|
|
|