/*
**********************************************************************
* Copyright (C) 2002-2010, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
*/
/*
* paragraphLayout doesn't make much sense without
* BreakIterator...
*/
#include "layout/LETypes.h"
#include "layout/LEScripts.h"
#include "layout/LELanguages.h"
#include "layout/LayoutEngine.h"
#include "layout/LEFontInstance.h"
#include "unicode/ubidi.h"
#include "unicode/uchriter.h"
#include "unicode/brkiter.h"
#if ! UCONFIG_NO_BREAK_ITERATION
#include "LXUtilities.h"
#include "usc_impl.h" /* this is currently private! */
#include "cstring.h" /* this too! */
#include "layout/ParagraphLayout.h"
U_NAMESPACE_BEGIN
#define ARRAY_SIZE(array) (sizeof array / sizeof array[0])
/* Leave this copyright notice here! It needs to go somewhere in this library. */
static const char copyright[] = U_COPYRIGHT_STRING;
class StyleRuns
{
public:
StyleRuns(const RunArray *styleRunArrays[], le_int32 styleCount);
~StyleRuns();
le_int32 getRuns(le_int32 runLimits[], le_int32 styleIndices[]);
private:
le_int32 fStyleCount;
le_int32 fRunCount;
le_int32 *fRunLimits;
le_int32 *fStyleIndices;
};
StyleRuns::StyleRuns(const RunArray *styleRunArrays[], le_int32 styleCount)
: fStyleCount(styleCount), fRunCount(0), fRunLimits(NULL), fStyleIndices(NULL)
{
le_int32 maxRunCount = 0;
le_int32 style, run, runStyle;
le_int32 *currentRun = LE_NEW_ARRAY(le_int32, styleCount);
for (int i = 0; i < styleCount; i += 1) {
maxRunCount += styleRunArrays[i]->getCount();
}
maxRunCount -= styleCount - 1;
fRunLimits = LE_NEW_ARRAY(le_int32, maxRunCount);
fStyleIndices = LE_NEW_ARRAY(le_int32, maxRunCount * styleCount);
for (style = 0; style < styleCount; style += 1) {
currentRun[style] = 0;
}
run = 0;
runStyle = 0;
/*
* Since the last run limit for each style run must be
* the same, all the styles will hit the last limit at
* the same time, so we know when we're done when the first
* style hits the last limit.
*/
while (currentRun[0] < styleRunArrays[0]->getCount()) {
fRunLimits[run] = 0x7FFFFFFF;
// find the minimum run limit for all the styles
for (style = 0; style < styleCount; style += 1) {
if (styleRunArrays[style]->getLimit(currentRun[style]) < fRunLimits[run]) {
fRunLimits[run] = styleRunArrays[style]->getLimit(currentRun[style]);
}
}
// advance all styles whose current run is at this limit to the next run
for (style = 0; style < styleCount; style += 1) {
fStyleIndices[runStyle++] = currentRun[style];
if (styleRunArrays[style]->getLimit(currentRun[style]) == fRunLimits[run]) {
currentRun[style] += 1;
}
}
run += 1;
}
fRunCount = run;
LE_DELETE_ARRAY(currentRun);
}
StyleRuns::~StyleRuns()
{
fRunCount = 0;
LE_DELETE_ARRAY(fStyleIndices);
fStyleIndices = NULL;
LE_DELETE_ARRAY(fRunLimits);
fRunLimits = NULL;
}
le_int32 StyleRuns::getRuns(le_int32 runLimits[], le_int32 styleIndices[])
{
if (runLimits != NULL) {
LE_ARRAY_COPY(runLimits, fRunLimits, fRunCount);
}
if (styleIndices != NULL) {
LE_ARRAY_COPY(styleIndices, fStyleIndices, fRunCount * fStyleCount);
}
return fRunCount;
}
/*
* NOTE: This table only has "TRUE" values for
* those scripts which the LayoutEngine can currently
* process, rather for all scripts which require
* complex processing for correct rendering.
*/
static const le_bool complexTable[scriptCodeCount] = {
FALSE , /* Zyyy */
FALSE, /* Qaai */
TRUE, /* Arab */
FALSE, /* Armn */
TRUE, /* Beng */
FALSE, /* Bopo */
FALSE, /* Cher */
FALSE, /* Copt=Qaac */
FALSE, /* Cyrl */
FALSE, /* Dsrt */
TRUE, /* Deva */
FALSE, /* Ethi */
FALSE, /* Geor */
FALSE, /* Goth */
FALSE, /* Grek */
TRUE, /* Gujr */
TRUE, /* Guru */
FALSE, /* Hani */
FALSE, /* Hang */
TRUE, /* Hebr */
FALSE, /* Hira */
TRUE, /* Knda */
FALSE, /* Kana */
FALSE, /* Khmr */
FALSE, /* Laoo */
FALSE, /* Latn */
TRUE, /* Mlym */
FALSE, /* Mong */
FALSE, /* Mymr */
FALSE, /* Ogam */
FALSE, /* Ital */
TRUE, /* Orya */
FALSE, /* Runr */
FALSE, /* Sinh */
FALSE, /* Syrc */
TRUE, /* Taml */
TRUE, /* Telu */
FALSE, /* Thaa */
TRUE, /* Thai */
FALSE, /* Tibt */
FALSE, /* Cans */
FALSE, /* Yiii */
FALSE, /* Tglg */
FALSE, /* Hano */
FALSE, /* Buhd */
FALSE, /* Tagb */
FALSE, /* Brai */
FALSE, /* Cprt */
FALSE, /* Limb */
FALSE, /* Linb */
FALSE, /* Osma */
FALSE, /* Shaw */
FALSE, /* Tale */
FALSE, /* Ugar */
FALSE, /* Hrkt */
FALSE, /* Bugi */
FALSE, /* Glag */
FALSE, /* Khar */
FALSE, /* Sylo */
FALSE, /* Talu */
FALSE, /* Tfng */
FALSE, /* Xpeo */
FALSE, /* Bali */
FALSE, /* Batk */
FALSE, /* Blis */
FALSE, /* Brah */
FALSE, /* Cham */
FALSE, /* Cirt */
FALSE, /* Cyrs */
FALSE, /* Egyd */
FALSE, /* Egyh */
FALSE, /* Egyp */
FALSE, /* Geok */
FALSE, /* Hans */
FALSE, /* Hant */
FALSE, /* Hmng */
FALSE, /* Hung */
FALSE, /* Inds */
FALSE, /* Java */
FALSE, /* Kali */
FALSE, /* Latf */
FALSE, /* Latg */
FALSE, /* Lepc */
FALSE, /* Lina */
FALSE, /* Mand */
FALSE, /* Maya */
FALSE, /* Mero */
FALSE, /* Nkoo */
FALSE, /* Orkh */
FALSE, /* Perm */
FALSE, /* Phag */
FALSE, /* Phnx */
FALSE, /* Plrd */
FALSE, /* Roro */
FALSE, /* Sara */
FALSE, /* Syre */
FALSE, /* Syrj */
FALSE, /* Syrn */
FALSE, /* Teng */
FALSE, /* Taii */
FALSE, /* Visp */
FALSE, /* Xsux */
FALSE, /* Zxxx */
FALSE, /* Zzzz */
FALSE, /* Cari */
FALSE, /* Jpan */
FALSE, /* Lana */
FALSE, /* Lyci */
FALSE, /* Lydi */
FALSE, /* Olck */
FALSE, /* Rjng */
FALSE, /* Saur */
FALSE, /* Sgnw */
FALSE, /* Sund */
FALSE, /* Moon */
FALSE, /* Mtei */
FALSE, /* Armi */
FALSE, /* Avst */
FALSE, /* Cakm */
FALSE, /* Kore */
FALSE, /* Kthi */
FALSE, /* Mani */
FALSE, /* Phli */
FALSE, /* Phlp */
FALSE, /* Phlv */
FALSE, /* Prti */
FALSE, /* Samr */
FALSE, /* Tavt */
FALSE, /* Zmth */
FALSE, /* Zsym */
FALSE, /* Bamu */
FALSE, /* Lisu */
FALSE, /* Nkgb */
FALSE /* Sarb */
};
const char ParagraphLayout::fgClassID = 0;
static void fillMissingCharToGlyphMapValues(le_int32 *charToGlyphMap,
le_int32 charCount) {
le_int32 lastValidGlyph = -1;
le_int32 ch;
for (ch = 0; ch <= charCount; ch += 1) {
if (charToGlyphMap[ch] == -1) {
charToGlyphMap[ch] = lastValidGlyph;
} else {
lastValidGlyph = charToGlyphMap[ch];
}
}
}
/*
* How to deal with composite fonts:
*
* Don't store the client's FontRuns; we'll need to compute sub-font FontRuns using Doug's
* LEFontInstance method. Do that by intersecting the client's FontRuns with fScriptRuns. Use
* that to compute fFontRuns, and then intersect fFontRuns, fScriptRuns and fLevelRuns. Doing
* it in this order means we do a two-way intersection and a three-way intersection.
*
* An optimization would be to only do this if there's at least one composite font...
*
* Other notes:
*
* * Return the sub-fonts as the run fonts... could keep the mapping back to the client's FontRuns
* but that probably makes it more complicated of everyone...
*
* * Take the LineInfo and LineRun types from Paragraph and use them here, incorporate them into the API.
*
* * Might want to change the name of the StyleRun type, and make a new one that holds fonts, scripts and levels?
*
*/
ParagraphLayout::ParagraphLayout(const LEUnicode chars[], le_int32 count,
const FontRuns *fontRuns,
const ValueRuns *levelRuns,
const ValueRuns *scriptRuns,
const LocaleRuns *localeRuns,
UBiDiLevel paragraphLevel, le_bool vertical,
LEErrorCode &status)
: fChars(chars), fCharCount(count),
fFontRuns(NULL), fLevelRuns(levelRuns), fScriptRuns(scriptRuns), fLocaleRuns(localeRuns),
fVertical(vertical), fClientLevels(TRUE), fClientScripts(TRUE), fClientLocales(TRUE), fEmbeddingLevels(NULL),
fAscent(0), fDescent(0), fLeading(0),
fGlyphToCharMap(NULL), fCharToMinGlyphMap(NULL), fCharToMaxGlyphMap(NULL), fGlyphWidths(NULL), fGlyphCount(0),
fParaBidi(NULL), fLineBidi(NULL),
fStyleRunLimits(NULL), fStyleIndices(NULL), fStyleRunCount(0),
fBreakIterator(NULL), fLineStart(-1), fLineEnd(0),
/*fVisualRuns(NULL), fStyleRunInfo(NULL), fVisualRunCount(-1),
fFirstVisualRun(-1), fLastVisualRun(-1),*/ fVisualRunLastX(0), fVisualRunLastY(0)
{
if (LE_FAILURE(status)) {
fCharCount = -1;
return;
}
// FIXME: should check the limit arrays for consistency...
computeLevels(paragraphLevel);
if (scriptRuns == NULL) {
computeScripts();
}
if (localeRuns == NULL) {
computeLocales();
}
computeSubFonts(fontRuns, status);
if (LE_FAILURE(status)) {
//other stuff?
fCharCount = -1;
return;
}
// now intersect the font, direction and script runs...
const RunArray *styleRunArrays[] = {fFontRuns, fLevelRuns, fScriptRuns, fLocaleRuns};
le_int32 styleCount = sizeof styleRunArrays / sizeof styleRunArrays[0];
StyleRuns styleRuns(styleRunArrays, styleCount);
LEErrorCode layoutStatus = LE_NO_ERROR;
fStyleRunCount = styleRuns.getRuns(NULL, NULL);
fStyleRunLimits = LE_NEW_ARRAY(le_int32, fStyleRunCount);
fStyleIndices = LE_NEW_ARRAY(le_int32, fStyleRunCount * styleCount);
if ((fStyleRunLimits == NULL) || (fStyleIndices == NULL)) {
status = LE_MEMORY_ALLOCATION_ERROR;
return;
}
styleRuns.getRuns(fStyleRunLimits, fStyleIndices);
// now build a LayoutEngine for each style run...
le_int32 *styleIndices = fStyleIndices;
le_int32 run, runStart;
fStyleRunInfo = LE_NEW_ARRAY(StyleRunInfo, fStyleRunCount);
if (fStyleRunInfo == NULL) {
status = LE_MEMORY_ALLOCATION_ERROR;
return;
}
else {
// initialize
for (runStart = 0, run = 0; run < fStyleRunCount; run += 1) {
fStyleRunInfo[run].font = NULL;
fStyleRunInfo[run].runBase = 0;
fStyleRunInfo[run].runLimit = 0;
fStyleRunInfo[run].script = (UScriptCode)0;
fStyleRunInfo[run].locale = NULL;
fStyleRunInfo[run].level = 0;
fStyleRunInfo[run].glyphBase = 0;
fStyleRunInfo[run].engine = NULL;
fStyleRunInfo[run].glyphCount = 0;
fStyleRunInfo[run].glyphs = NULL;
fStyleRunInfo[run].positions = NULL;
}
}
fGlyphCount = 0;
for (runStart = 0, run = 0; run < fStyleRunCount; run += 1) {
fStyleRunInfo[run].font = fFontRuns->getFont(styleIndices[0]);
fStyleRunInfo[run].runBase = runStart;
fStyleRunInfo[run].runLimit = fStyleRunLimits[run];
fStyleRunInfo[run].script = (UScriptCode) fScriptRuns->getValue(styleIndices[2]);
fStyleRunInfo[run].locale = fLocaleRuns->getLocale(styleIndices[3]);
fStyleRunInfo[run].level = (UBiDiLevel) fLevelRuns->getValue(styleIndices[1]);
fStyleRunInfo[run].glyphBase = fGlyphCount;
fStyleRunInfo[run].engine = LayoutEngine::layoutEngineFactory(fStyleRunInfo[run].font,
fStyleRunInfo[run].script, getLanguageCode(fStyleRunInfo[run].locale), layoutStatus);
if (LE_FAILURE(layoutStatus)) {
status = layoutStatus;
return;
}
fStyleRunInfo[run].glyphCount = fStyleRunInfo[run].engine->layoutChars(fChars, runStart, fStyleRunLimits[run] - runStart, fCharCount,
fStyleRunInfo[run].level & 1, 0, 0, layoutStatus);
if (LE_FAILURE(layoutStatus)) {
status = layoutStatus;
return;
}
runStart = fStyleRunLimits[run];
styleIndices += styleCount;
fGlyphCount += fStyleRunInfo[run].glyphCount;
}
// Make big arrays for the glyph widths, glyph-to-char and char-to-glyph maps,
// in logical order. (Both maps need an extra entry for the end of the text.)
//
// For each layout get the positions and convert them into glyph widths, in
// logical order. Get the glyph-to-char mapping, offset by starting index in the
// character array. Swap the glyph width and glyph-to-char arrays into logical order.
// Finally, fill in the char-to-glyph mappings.
fGlyphWidths = LE_NEW_ARRAY(float, fGlyphCount);
fGlyphToCharMap = LE_NEW_ARRAY(le_int32, fGlyphCount + 1);
fCharToMinGlyphMap = LE_NEW_ARRAY(le_int32, fCharCount + 1);
fCharToMaxGlyphMap = LE_NEW_ARRAY(le_int32, fCharCount + 1);
if ((fGlyphWidths == NULL) || (fGlyphToCharMap == NULL) ||
(fCharToMinGlyphMap == NULL) || (fCharToMaxGlyphMap == NULL)) {
status = LE_MEMORY_ALLOCATION_ERROR;
return;
}
le_int32 glyph;
for (runStart = 0, run = 0; run < fStyleRunCount; run += 1) {
LayoutEngine *engine = fStyleRunInfo[run].engine;
le_int32 glyphCount = fStyleRunInfo[run].glyphCount;
le_int32 glyphBase = fStyleRunInfo[run].glyphBase;
fStyleRunInfo[run].glyphs = LE_NEW_ARRAY(LEGlyphID, glyphCount);
fStyleRunInfo[run].positions = LE_NEW_ARRAY(float, glyphCount * 2 + 2);
if ((fStyleRunInfo[run].glyphs == NULL) ||
(fStyleRunInfo[run].positions == NULL)) {
status = LE_MEMORY_ALLOCATION_ERROR;
return;
}
engine->getGlyphs(fStyleRunInfo[run].glyphs, layoutStatus);
if (LE_FAILURE(layoutStatus)) {
status = layoutStatus;
return;
}
engine->getGlyphPositions(fStyleRunInfo[run].positions, layoutStatus);
if (LE_FAILURE(layoutStatus)) {
status = layoutStatus;
return;
}
engine->getCharIndices(&fGlyphToCharMap[glyphBase], runStart, layoutStatus);
if (LE_FAILURE(layoutStatus)) {
status = layoutStatus;
return;
}
for (glyph = 0; glyph < glyphCount; glyph += 1) {
fGlyphWidths[glyphBase + glyph] = fStyleRunInfo[run].positions[glyph * 2 + 2] - fStyleRunInfo[run].positions[glyph * 2];
}
if ((fStyleRunInfo[run].level & 1) != 0) {
LXUtilities::reverse(&fGlyphWidths[glyphBase], glyphCount);
LXUtilities::reverse(&fGlyphToCharMap[glyphBase], glyphCount);
}
runStart = fStyleRunLimits[run];
delete engine;
fStyleRunInfo[run].engine = NULL;
}
fGlyphToCharMap[fGlyphCount] = fCharCount;
// Initialize the char-to-glyph maps to -1 so that we can later figure out
// whether any of the entries in the map aren't filled in below.
le_int32 chIndex;
for (chIndex = 0; chIndex <= fCharCount; chIndex += 1) {
fCharToMinGlyphMap[chIndex] = -1;
fCharToMaxGlyphMap[chIndex] = -1;
}
for (glyph = fGlyphCount - 1; glyph >= 0; glyph -= 1) {
le_int32 ch = fGlyphToCharMap[glyph];
fCharToMinGlyphMap[ch] = glyph;
}
fCharToMinGlyphMap[fCharCount] = fGlyphCount;
for (glyph = 0; glyph < fGlyphCount; glyph += 1) {
le_int32 ch = fGlyphToCharMap[glyph];
fCharToMaxGlyphMap[ch] = glyph;
}
fCharToMaxGlyphMap[fCharCount] = fGlyphCount;
// Now fill in the missing values in the char-to-glyph maps.
fillMissingCharToGlyphMapValues(fCharToMinGlyphMap, fCharCount);
fillMissingCharToGlyphMapValues(fCharToMaxGlyphMap, fCharCount);
}
ParagraphLayout::~ParagraphLayout()
{
delete (FontRuns *) fFontRuns;
if (! fClientLevels) {
delete (ValueRuns *) fLevelRuns;
fLevelRuns = NULL;
fClientLevels = TRUE;
}
if (! fClientScripts) {
delete (ValueRuns *) fScriptRuns;
fScriptRuns = NULL;
fClientScripts = TRUE;
}
if (! fClientLocales) {
delete (LocaleRuns *) fLocaleRuns;
fLocaleRuns = NULL;
fClientLocales = TRUE;
}
if (fEmbeddingLevels != NULL) {
LE_DELETE_ARRAY(fEmbeddingLevels);
fEmbeddingLevels = NULL;
}
if (fGlyphToCharMap != NULL) {
LE_DELETE_ARRAY(fGlyphToCharMap);
fGlyphToCharMap = NULL;
}
if (fCharToMinGlyphMap != NULL) {
LE_DELETE_ARRAY(fCharToMinGlyphMap);
fCharToMinGlyphMap = NULL;
}
if (fCharToMaxGlyphMap != NULL) {
LE_DELETE_ARRAY(fCharToMaxGlyphMap);
fCharToMaxGlyphMap = NULL;
}
if (fGlyphWidths != NULL) {
LE_DELETE_ARRAY(fGlyphWidths);
fGlyphWidths = NULL;
}
if (fParaBidi != NULL) {
ubidi_close(fParaBidi);
fParaBidi = NULL;
}
if (fLineBidi != NULL) {
ubidi_close(fLineBidi);
fLineBidi = NULL;
}
if (fStyleRunCount > 0) {
le_int32 run;
LE_DELETE_ARRAY(fStyleRunLimits);
LE_DELETE_ARRAY(fStyleIndices);
for (run = 0; run < fStyleRunCount; run += 1) {
LE_DELETE_ARRAY(fStyleRunInfo[run].glyphs);
LE_DELETE_ARRAY(fStyleRunInfo[run].positions);
fStyleRunInfo[run].glyphs = NULL;
fStyleRunInfo[run].positions = NULL;
}
LE_DELETE_ARRAY(fStyleRunInfo);
fStyleRunLimits = NULL;
fStyleIndices = NULL;
fStyleRunInfo = NULL;
fStyleRunCount = 0;
}
if (fBreakIterator != NULL) {
delete fBreakIterator;
fBreakIterator = NULL;
}
}
le_bool ParagraphLayout::isComplex(const LEUnicode chars[], le_int32 count)
{
UErrorCode scriptStatus = U_ZERO_ERROR;
UScriptCode scriptCode = USCRIPT_INVALID_CODE;
UScriptRun *sr = uscript_openRun(chars, count, &scriptStatus);
le_bool result = FALSE;
while (uscript_nextRun(sr, NULL, NULL, &scriptCode)) {
if (isComplex(scriptCode)) {
result = TRUE;
break;
}
}
uscript_closeRun(sr);
return result;
}
le_int32 ParagraphLayout::getAscent() const
{
if (fAscent <= 0 && fCharCount > 0) {
((ParagraphLayout *) this)->computeMetrics();
}
return fAscent;
}
le_int32 ParagraphLayout::getDescent() const
{
if (fAscent <= 0 && fCharCount > 0) {
((ParagraphLayout *) this)->computeMetrics();
}
return fDescent;
}
le_int32 ParagraphLayout::getLeading() const
{
if (fAscent <= 0 && fCharCount > 0) {
((ParagraphLayout *) this)->computeMetrics();
}
return fLeading;
}
le_bool ParagraphLayout::isDone() const
{
return fLineEnd >= fCharCount;
}
ParagraphLayout::Line *ParagraphLayout::nextLine(float width)
{
if (isDone()) {
return NULL;
}
fLineStart = fLineEnd;
if (width > 0) {
le_int32 glyph = fCharToMinGlyphMap[fLineStart];
float widthSoFar = 0;
while (glyph < fGlyphCount && widthSoFar + fGlyphWidths[glyph] <= width) {
widthSoFar += fGlyphWidths[glyph++];
}
// If no glyphs fit on the line, force one to fit.
//
// (There shouldn't be any zero width glyphs at the
// start of a line unless the paragraph consists of
// only zero width glyphs, because otherwise the zero
// width glyphs will have been included on the end of
// the previous line...)
if (widthSoFar == 0 && glyph < fGlyphCount) {
glyph += 1;
}
fLineEnd = previousBreak(fGlyphToCharMap[glyph]);
// If this break is at or before the last one,
// find a glyph, starting at the one which didn't
// fit, that produces a break after the last one.
while (fLineEnd <= fLineStart) {
fLineEnd = fGlyphToCharMap[glyph++];
}
} else {
fLineEnd = fCharCount;
}
return computeVisualRuns();
}
void ParagraphLayout::computeLevels(UBiDiLevel paragraphLevel)
{
UErrorCode bidiStatus = U_ZERO_ERROR;
if (fLevelRuns != NULL) {
le_int32 ch;
le_int32 run;
fEmbeddingLevels = LE_NEW_ARRAY(UBiDiLevel, fCharCount);
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, LEErrorCode &status)
{
if (LE_FAILURE(status)) {
return;
}
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]);
while (offset < styleRunLimits[run]) {
const LEFontInstance *subFont = runFont->getSubFont(fChars, &offset, styleRunLimits[run], script, status);
if (LE_FAILURE(status)) {
delete subFontRuns;
goto cleanUp;
}
subFontRuns->add(subFont, offset);
}
si += styleCount;
}
fFontRuns = subFontRuns;
cleanUp:
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[] =
{
{"afr", afkLanguageCode}, // Afrikaans
{"ara", araLanguageCode}, // Arabic
{"asm", asmLanguageCode}, // Assamese
{"bel", belLanguageCode}, // Belarussian
{"ben", benLanguageCode}, // Bengali
{"bod", tibLanguageCode}, // Tibetan
{"bul", bgrLanguageCode}, // Bulgarian
{"cat", catLanguageCode}, // Catalan
{"ces", csyLanguageCode}, // Czech
{"che", cheLanguageCode}, // Chechen
{"cop", copLanguageCode}, // Coptic
{"cym", welLanguageCode}, // Welsh
{"dan", danLanguageCode}, // Danish
{"deu", deuLanguageCode}, // German
{"dzo", dznLanguageCode}, // Dzongkha
{"ell", ellLanguageCode}, // Greek
{"eng", engLanguageCode}, // English
{"est", etiLanguageCode}, // Estonian
{"eus", euqLanguageCode}, // Basque
{"fas", farLanguageCode}, // Farsi
{"fin", finLanguageCode}, // Finnish
{"fra", fraLanguageCode}, // French
{"gle", gaeLanguageCode}, // Irish Gaelic
{"guj", gujLanguageCode}, // Gujarati
{"hau", hauLanguageCode}, // Hausa
{"heb", iwrLanguageCode}, // Hebrew
{"hin", hinLanguageCode}, // Hindi
{"hrv", hrvLanguageCode}, // Croatian
{"hun", hunLanguageCode}, // Hungarian
{"hye", hyeLanguageCode}, // Armenian
{"ind", indLanguageCode}, // Indonesian
{"ita", itaLanguageCode}, // Italian
{"jpn", janLanguageCode}, // Japanese
{"kan", kanLanguageCode}, // Kannada
{"kas", kshLanguageCode}, // Kashmiri
{"khm", khmLanguageCode}, // Khmer
{"kok", kokLanguageCode}, // Konkani
{"kor", korLanguageCode}, // Korean
// {"mal_XXX", malLanguageCode}, // Malayalam - Traditional
{"mal", mlrLanguageCode}, // Malayalam - Reformed
{"mar", marLanguageCode}, // Marathi
{"mlt", mtsLanguageCode}, // Maltese
{"mni", mniLanguageCode}, // Manipuri
{"mon", mngLanguageCode}, // Mongolian
{"nep", nepLanguageCode}, // Nepali
{"ori", oriLanguageCode}, // Oriya
{"pol", plkLanguageCode}, // Polish
{"por", ptgLanguageCode}, // Portuguese
{"pus", pasLanguageCode}, // Pashto
{"ron", romLanguageCode}, // Romanian
{"rus", rusLanguageCode}, // Russian
{"san", sanLanguageCode}, // Sanskrit
{"sin", snhLanguageCode}, // Sinhalese
{"slk", skyLanguageCode}, // Slovak
{"snd", sndLanguageCode}, // Sindhi
{"slv", slvLanguageCode}, // Slovenian
{"spa", espLanguageCode}, // Spanish
{"sqi", sqiLanguageCode}, // Albanian
{"srp", srbLanguageCode}, // Serbian
{"swe", sveLanguageCode}, // Swedish
{"syr", syrLanguageCode}, // Syriac
{"tam", tamLanguageCode}, // Tamil
{"tel", telLanguageCode}, // Telugu
{"tha", thaLanguageCode}, // Thai
{"tur", trkLanguageCode}, // Turkish
{"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;
}
#else
// 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 >= (UScriptCode) scriptCodeCount) {
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 minGlyph = fCharToMinGlyphMap[ch];
le_int32 maxGlyph = fCharToMaxGlyphMap[ch];
if (minGlyph < leftGlyph) {
leftGlyph = minGlyph;
}
if (maxGlyph > rightGlyph) {
rightGlyph = maxGlyph;
}
}
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[outGlyph - 1];
if ((fStyleRunInfo[run].level & 1) == 0) {
for (outGlyph = 0, inGlyph = leftGlyph; inGlyph < rightGlyph; inGlyph += 1, outGlyph += 1) {
glyphToCharMap[outGlyph] = fGlyphToCharMap[glyphBase + inGlyph];
}
} else {
// Because fGlyphToCharMap is stored in logical order to facilitate line breaking,
// we need to map the physical glyph indices to logical indices while we copy the
// character indices.
le_int32 base = glyphBase + fStyleRunInfo[run].glyphCount - 1;
for (outGlyph = 0, inGlyph = leftGlyph; inGlyph < rightGlyph; inGlyph += 1, outGlyph += 1) {
glyphToCharMap[outGlyph] = fGlyphToCharMap[base - 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;
}
le_int32 ParagraphLayout::Line::getWidth() const
{
const VisualRun *lastRun = getVisualRun(fRunCount - 1);
if (lastRun == NULL) {
return 0;
}
le_int32 glyphCount = lastRun->getGlyphCount();
const float *positions = lastRun->getPositions();
return (le_int32) positions[glyphCount * 2];
}
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