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|
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qfontengine_qpa_p.h"
#include <QtCore/QFile>
#include <QtCore/QFileInfo>
#include <QtCore/QDir>
#include <QtCore/QBuffer>
#include <QtGui/private/qapplication_p.h>
#include <QtGui/QPlatformFontDatabase>
#include <QtGui/private/qpaintengine_raster_p.h>
QT_BEGIN_NAMESPACE
//#define DEBUG_HEADER
//#define DEBUG_FONTENGINE
static QFontEngineQPA::TagType tagTypes[QFontEngineQPA::NumTags] = {
QFontEngineQPA::StringType, // FontName
QFontEngineQPA::StringType, // FileName
QFontEngineQPA::UInt32Type, // FileIndex
QFontEngineQPA::UInt32Type, // FontRevision
QFontEngineQPA::StringType, // FreeText
QFontEngineQPA::FixedType, // Ascent
QFontEngineQPA::FixedType, // Descent
QFontEngineQPA::FixedType, // Leading
QFontEngineQPA::FixedType, // XHeight
QFontEngineQPA::FixedType, // AverageCharWidth
QFontEngineQPA::FixedType, // MaxCharWidth
QFontEngineQPA::FixedType, // LineThickness
QFontEngineQPA::FixedType, // MinLeftBearing
QFontEngineQPA::FixedType, // MinRightBearing
QFontEngineQPA::FixedType, // UnderlinePosition
QFontEngineQPA::UInt8Type, // GlyphFormat
QFontEngineQPA::UInt8Type, // PixelSize
QFontEngineQPA::UInt8Type, // Weight
QFontEngineQPA::UInt8Type, // Style
QFontEngineQPA::StringType, // EndOfHeader
QFontEngineQPA::BitFieldType// WritingSystems
};
#if defined(DEBUG_HEADER)
# define DEBUG_VERIFY qDebug
#else
# define DEBUG_VERIFY if (0) qDebug
#endif
#define READ_VERIFY(type, variable) \
if (tagPtr + sizeof(type) > endPtr) { \
DEBUG_VERIFY() << "read verify failed in line" << __LINE__; \
return 0; \
} \
variable = qFromBigEndian<type>(tagPtr); \
DEBUG_VERIFY() << "read value" << variable << "of type " #type; \
tagPtr += sizeof(type)
template <typename T>
T readValue(const uchar *&data)
{
T value = qFromBigEndian<T>(data);
data += sizeof(T);
return value;
}
#define VERIFY(condition) \
if (!(condition)) { \
DEBUG_VERIFY() << "condition " #condition " failed in line" << __LINE__; \
return 0; \
}
#define VERIFY_TAG(condition) \
if (!(condition)) { \
DEBUG_VERIFY() << "verifying tag condition " #condition " failed in line" << __LINE__ << "with tag" << tag; \
return 0; \
}
static inline const uchar *verifyTag(const uchar *tagPtr, const uchar *endPtr)
{
quint16 tag, length;
READ_VERIFY(quint16, tag);
READ_VERIFY(quint16, length);
if (tag == QFontEngineQPA::Tag_EndOfHeader)
return endPtr;
if (tag < QFontEngineQPA::NumTags) {
switch (tagTypes[tag]) {
case QFontEngineQPA::BitFieldType:
case QFontEngineQPA::StringType:
// can't do anything...
break;
case QFontEngineQPA::UInt32Type:
VERIFY_TAG(length == sizeof(quint32));
break;
case QFontEngineQPA::FixedType:
VERIFY_TAG(length == sizeof(quint32));
break;
case QFontEngineQPA::UInt8Type:
VERIFY_TAG(length == sizeof(quint8));
break;
}
#if defined(DEBUG_HEADER)
if (length == 1)
qDebug() << "tag data" << hex << *tagPtr;
else if (length == 4)
qDebug() << "tag data" << hex << tagPtr[0] << tagPtr[1] << tagPtr[2] << tagPtr[3];
#endif
}
return tagPtr + length;
}
const QFontEngineQPA::Glyph *QFontEngineQPA::findGlyph(glyph_t g) const
{
if (!g || g >= glyphMapEntries)
return 0;
const quint32 *gmapPtr = reinterpret_cast<const quint32 *>(fontData + glyphMapOffset);
quint32 glyphPos = qFromBigEndian<quint32>(gmapPtr[g]);
if (glyphPos > glyphDataSize) {
if (glyphPos == 0xffffffff)
return 0;
#if defined(DEBUG_FONTENGINE)
qDebug() << "glyph" << g << "outside of glyphData, remapping font file";
#endif
if (glyphPos > glyphDataSize)
return 0;
}
return reinterpret_cast<const Glyph *>(fontData + glyphDataOffset + glyphPos);
}
bool QFontEngineQPA::verifyHeader(const uchar *data, int size)
{
VERIFY(size >= int(sizeof(Header)));
const Header *header = reinterpret_cast<const Header *>(data);
if (header->magic[0] != 'Q'
|| header->magic[1] != 'P'
|| header->magic[2] != 'F'
|| header->magic[3] != '2')
return false;
VERIFY(header->majorVersion <= CurrentMajorVersion);
const quint16 dataSize = qFromBigEndian<quint16>(header->dataSize);
VERIFY(size >= int(sizeof(Header)) + dataSize);
const uchar *tagPtr = data + sizeof(Header);
const uchar *tagEndPtr = tagPtr + dataSize;
while (tagPtr < tagEndPtr - 3) {
tagPtr = verifyTag(tagPtr, tagEndPtr);
VERIFY(tagPtr);
}
VERIFY(tagPtr <= tagEndPtr);
return true;
}
QVariant QFontEngineQPA::extractHeaderField(const uchar *data, HeaderTag requestedTag)
{
const Header *header = reinterpret_cast<const Header *>(data);
const uchar *tagPtr = data + sizeof(Header);
const uchar *endPtr = tagPtr + qFromBigEndian<quint16>(header->dataSize);
while (tagPtr < endPtr - 3) {
quint16 tag = readValue<quint16>(tagPtr);
quint16 length = readValue<quint16>(tagPtr);
if (tag == requestedTag) {
switch (tagTypes[requestedTag]) {
case StringType:
return QVariant(QString::fromUtf8(reinterpret_cast<const char *>(tagPtr), length));
case UInt32Type:
return QVariant(readValue<quint32>(tagPtr));
case UInt8Type:
return QVariant(uint(*tagPtr));
case FixedType:
return QVariant(QFixed::fromFixed(readValue<quint32>(tagPtr)).toReal());
case BitFieldType:
return QVariant(QByteArray(reinterpret_cast<const char *>(tagPtr), length));
}
return QVariant();
} else if (tag == Tag_EndOfHeader) {
break;
}
tagPtr += length;
}
return QVariant();
}
static inline unsigned int getChar(const QChar *str, int &i, const int len)
{
uint ucs4 = str[i].unicode();
if (str[i].isHighSurrogate() && i < len-1 && str[i+1].isLowSurrogate()) {
++i;
ucs4 = QChar::surrogateToUcs4(ucs4, str[i].unicode());
}
return ucs4;
}
QFontEngineQPA::QFontEngineQPA(const QFontDef &def, const QByteArray &data)
: fontData(reinterpret_cast<const uchar *>(data.constData())), dataSize(data.size())
{
fontDef = def;
cache_cost = 100;
externalCMap = 0;
cmapOffset = 0;
cmapSize = 0;
glyphMapOffset = 0;
glyphMapEntries = 0;
glyphDataOffset = 0;
glyphDataSize = 0;
kerning_pairs_loaded = false;
readOnly = true;
#if defined(DEBUG_FONTENGINE)
qDebug() << "QFontEngineQPA::QFontEngineQPA( fd =" << fd << ", renderingFontEngine =" << renderingFontEngine << ')';
#endif
if (!verifyHeader(fontData, dataSize)) {
#if defined(DEBUG_FONTENGINE)
qDebug() << "verifyHeader failed!";
#endif
return;
}
const Header *header = reinterpret_cast<const Header *>(fontData);
readOnly = (header->lock == 0xffffffff);
const uchar *imgData = fontData + sizeof(Header) + qFromBigEndian<quint16>(header->dataSize);
const uchar *endPtr = fontData + dataSize;
while (imgData <= endPtr - 8) {
quint16 blockTag = readValue<quint16>(imgData);
imgData += 2; // skip padding
quint32 blockSize = readValue<quint32>(imgData);
if (blockTag == CMapBlock) {
cmapOffset = imgData - fontData;
cmapSize = blockSize;
} else if (blockTag == GMapBlock) {
glyphMapOffset = imgData - fontData;
glyphMapEntries = blockSize / 4;
} else if (blockTag == GlyphBlock) {
glyphDataOffset = imgData - fontData;
glyphDataSize = blockSize;
}
imgData += blockSize;
}
face_id.filename = QFile::encodeName(extractHeaderField(fontData, Tag_FileName).toString());
face_id.index = extractHeaderField(fontData, Tag_FileIndex).toInt();
// get the real cmap
if (cmapOffset) {
int tableSize = cmapSize;
const uchar *cmapPtr = getCMap(fontData + cmapOffset, tableSize, &symbol, &cmapSize);
if (cmapPtr)
cmapOffset = cmapPtr - fontData;
else
cmapOffset = 0;
} else if (externalCMap) {
int tableSize = cmapSize;
externalCMap = getCMap(externalCMap, tableSize, &symbol, &cmapSize);
}
// verify all the positions in the glyphMap
if (glyphMapOffset) {
const quint32 *gmapPtr = reinterpret_cast<const quint32 *>(fontData + glyphMapOffset);
for (uint i = 0; i < glyphMapEntries; ++i) {
quint32 glyphDataPos = qFromBigEndian<quint32>(gmapPtr[i]);
if (glyphDataPos == 0xffffffff)
continue;
if (glyphDataPos >= glyphDataSize) {
// error
glyphMapOffset = 0;
glyphMapEntries = 0;
break;
}
}
}
#if defined(DEBUG_FONTENGINE)
if (!isValid())
qDebug() << "fontData" << fontData << "dataSize" << dataSize
<< "externalCMap" << externalCMap << "cmapOffset" << cmapOffset
<< "glyphMapOffset" << glyphMapOffset << "glyphDataOffset" << glyphDataOffset
<< "fd" << fd << "glyphDataSize" << glyphDataSize;
#endif
}
QFontEngineQPA::~QFontEngineQPA()
{
}
bool QFontEngineQPA::getSfntTableData(uint tag, uchar *buffer, uint *length) const
{
Q_UNUSED(tag);
Q_UNUSED(buffer);
*length = 0;
return false;
}
bool QFontEngineQPA::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const
{
if (*nglyphs < len) {
*nglyphs = len;
return false;
}
#if defined(DEBUG_FONTENGINE)
QSet<QChar> seenGlyphs;
#endif
const uchar *cmap = externalCMap ? externalCMap : (fontData + cmapOffset);
bool mirrored = flags & QTextEngine::RightToLeft;
int glyph_pos = 0;
if (symbol) {
for (int i = 0; i < len; ++i) {
unsigned int uc = getChar(str, i, len);
if (mirrored)
uc = QChar::mirroredChar(uc);
glyphs->glyphs[glyph_pos] = getTrueTypeGlyphIndex(cmap, uc);
if(!glyphs->glyphs[glyph_pos] && uc < 0x100)
glyphs->glyphs[glyph_pos] = getTrueTypeGlyphIndex(cmap, uc + 0xf000);
++glyph_pos;
}
} else {
for (int i = 0; i < len; ++i) {
unsigned int uc = getChar(str, i, len);
if (mirrored)
uc = QChar::mirroredChar(uc);
glyphs->glyphs[glyph_pos] = getTrueTypeGlyphIndex(cmap, uc);
#if 0 && defined(DEBUG_FONTENGINE)
QChar c(uc);
if (!findGlyph(glyphs[glyph_pos].glyph) && !seenGlyphs.contains(c))
qDebug() << "glyph for character" << c << '/' << hex << uc << "is" << dec << glyphs[glyph_pos].glyph;
seenGlyphs.insert(c);
#endif
++glyph_pos;
}
}
*nglyphs = glyph_pos;
glyphs->numGlyphs = glyph_pos;
recalcAdvances(glyphs, flags);
return true;
}
void QFontEngineQPA::recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags) const
{
for (int i = 0; i < glyphs->numGlyphs; ++i) {
const Glyph *g = findGlyph(glyphs->glyphs[i]);
if (!g) {
glyphs->glyphs[i] = 0;
continue;
}
glyphs->advances_x[i] = g->advance;
glyphs->advances_y[i] = 0;
}
}
QImage QFontEngineQPA::alphaMapForGlyph(glyph_t g)
{
const Glyph *glyph = findGlyph(g);
if (!glyph)
return QImage();
const uchar *bits = ((const uchar *) glyph) + sizeof(Glyph);
QImage image(bits,glyph->width, glyph->height, glyph->bytesPerLine, QImage::Format_Indexed8);
return image;
}
void QFontEngineQPA::addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, QPainterPath *path, QTextItem::RenderFlags flags)
{
addBitmapFontToPath(x, y, glyphs, path, flags);
}
glyph_metrics_t QFontEngineQPA::boundingBox(const QGlyphLayout &glyphs)
{
glyph_metrics_t overall;
// initialize with line height, we get the same behaviour on all platforms
overall.y = -ascent();
overall.height = ascent() + descent() + 1;
QFixed ymax = 0;
QFixed xmax = 0;
for (int i = 0; i < glyphs.numGlyphs; i++) {
const Glyph *g = findGlyph(glyphs.glyphs[i]);
if (!g)
continue;
QFixed x = overall.xoff + glyphs.offsets[i].x + g->x;
QFixed y = overall.yoff + glyphs.offsets[i].y + g->y;
overall.x = qMin(overall.x, x);
overall.y = qMin(overall.y, y);
xmax = qMax(xmax, x + g->width);
ymax = qMax(ymax, y + g->height);
overall.xoff += g->advance;
}
overall.height = qMax(overall.height, ymax - overall.y);
overall.width = xmax - overall.x;
return overall;
}
glyph_metrics_t QFontEngineQPA::boundingBox(glyph_t glyph)
{
glyph_metrics_t overall;
const Glyph *g = findGlyph(glyph);
if (!g)
return overall;
overall.x = g->x;
overall.y = g->y;
overall.width = g->width;
overall.height = g->height;
overall.xoff = g->advance;
return overall;
}
QFixed QFontEngineQPA::ascent() const
{
return QFixed::fromReal(extractHeaderField(fontData, Tag_Ascent).value<qreal>());
}
QFixed QFontEngineQPA::descent() const
{
return QFixed::fromReal(extractHeaderField(fontData, Tag_Descent).value<qreal>());
}
QFixed QFontEngineQPA::leading() const
{
return QFixed::fromReal(extractHeaderField(fontData, Tag_Leading).value<qreal>());
}
qreal QFontEngineQPA::maxCharWidth() const
{
return extractHeaderField(fontData, Tag_MaxCharWidth).value<qreal>();
}
qreal QFontEngineQPA::minLeftBearing() const
{
return extractHeaderField(fontData, Tag_MinLeftBearing).value<qreal>();
}
qreal QFontEngineQPA::minRightBearing() const
{
return extractHeaderField(fontData, Tag_MinRightBearing).value<qreal>();
}
QFixed QFontEngineQPA::underlinePosition() const
{
return QFixed::fromReal(extractHeaderField(fontData, Tag_UnderlinePosition).value<qreal>());
}
QFixed QFontEngineQPA::lineThickness() const
{
return QFixed::fromReal(extractHeaderField(fontData, Tag_LineThickness).value<qreal>());
}
QFontEngine::Type QFontEngineQPA::type() const
{
return QFontEngine::QPF2;
}
bool QFontEngineQPA::canRender(const QChar *string, int len)
{
const uchar *cmap = externalCMap ? externalCMap : (fontData + cmapOffset);
if (symbol) {
for (int i = 0; i < len; ++i) {
unsigned int uc = getChar(string, i, len);
glyph_t g = getTrueTypeGlyphIndex(cmap, uc);
if(!g && uc < 0x100)
g = getTrueTypeGlyphIndex(cmap, uc + 0xf000);
if (!g)
return false;
}
} else {
for (int i = 0; i < len; ++i) {
unsigned int uc = getChar(string, i, len);
if (!getTrueTypeGlyphIndex(cmap, uc))
return false;
}
}
return true;
}
bool QFontEngineQPA::isValid() const
{
return fontData && dataSize && (cmapOffset || externalCMap)
&& glyphMapOffset && glyphDataOffset && glyphDataSize > 0;
}
void QPAGenerator::generate()
{
writeHeader();
writeGMap();
writeBlock(QFontEngineQPA::GlyphBlock, QByteArray());
dev->seek(4); // position of header.lock
writeUInt32(0);
}
void QPAGenerator::writeHeader()
{
QFontEngineQPA::Header header;
header.magic[0] = 'Q';
header.magic[1] = 'P';
header.magic[2] = 'F';
header.magic[3] = '2';
header.lock = 1;
header.majorVersion = QFontEngineQPA::CurrentMajorVersion;
header.minorVersion = QFontEngineQPA::CurrentMinorVersion;
header.dataSize = 0;
dev->write((const char *)&header, sizeof(header));
writeTaggedString(QFontEngineQPA::Tag_FontName, fe->fontDef.family.toUtf8());
QFontEngine::FaceId face = fe->faceId();
writeTaggedString(QFontEngineQPA::Tag_FileName, face.filename);
writeTaggedUInt32(QFontEngineQPA::Tag_FileIndex, face.index);
{
uchar data[4];
uint len = 4;
bool ok = fe->getSfntTableData(MAKE_TAG('h', 'e', 'a', 'd'), data, &len);
if (ok) {
const quint32 revision = qFromBigEndian<quint32>(data);
writeTaggedUInt32(QFontEngineQPA::Tag_FontRevision, revision);
}
}
writeTaggedQFixed(QFontEngineQPA::Tag_Ascent, fe->ascent());
writeTaggedQFixed(QFontEngineQPA::Tag_Descent, fe->descent());
writeTaggedQFixed(QFontEngineQPA::Tag_Leading, fe->leading());
writeTaggedQFixed(QFontEngineQPA::Tag_XHeight, fe->xHeight());
writeTaggedQFixed(QFontEngineQPA::Tag_AverageCharWidth, fe->averageCharWidth());
writeTaggedQFixed(QFontEngineQPA::Tag_MaxCharWidth, QFixed::fromReal(fe->maxCharWidth()));
writeTaggedQFixed(QFontEngineQPA::Tag_LineThickness, fe->lineThickness());
writeTaggedQFixed(QFontEngineQPA::Tag_MinLeftBearing, QFixed::fromReal(fe->minLeftBearing()));
writeTaggedQFixed(QFontEngineQPA::Tag_MinRightBearing, QFixed::fromReal(fe->minRightBearing()));
writeTaggedQFixed(QFontEngineQPA::Tag_UnderlinePosition, fe->underlinePosition());
writeTaggedUInt8(QFontEngineQPA::Tag_PixelSize, fe->fontDef.pixelSize);
writeTaggedUInt8(QFontEngineQPA::Tag_Weight, fe->fontDef.weight);
writeTaggedUInt8(QFontEngineQPA::Tag_Style, fe->fontDef.style);
writeTaggedUInt8(QFontEngineQPA::Tag_GlyphFormat, QFontEngineQPA::AlphamapGlyphs);
writeTaggedString(QFontEngineQPA::Tag_EndOfHeader, QByteArray());
align4();
const quint64 size = dev->pos();
header.dataSize = qToBigEndian<quint16>(size - sizeof(header));
dev->seek(0);
dev->write((const char *)&header, sizeof(header));
dev->seek(size);
}
void QPAGenerator::writeGMap()
{
const quint16 glyphCount = fe->glyphCount();
writeUInt16(QFontEngineQPA::GMapBlock);
writeUInt16(0); // padding
writeUInt32(glyphCount * 4);
QByteArray &buffer = dev->buffer();
const int numBytes = glyphCount * sizeof(quint32);
qint64 pos = buffer.size();
buffer.resize(pos + numBytes);
qMemSet(buffer.data() + pos, 0xff, numBytes);
dev->seek(pos + numBytes);
}
void QPAGenerator::writeBlock(QFontEngineQPA::BlockTag tag, const QByteArray &data)
{
writeUInt16(tag);
writeUInt16(0); // padding
const int padSize = ((data.size() + 3) / 4) * 4 - data.size();
writeUInt32(data.size() + padSize);
dev->write(data);
for (int i = 0; i < padSize; ++i)
writeUInt8(0);
}
void QPAGenerator::writeTaggedString(QFontEngineQPA::HeaderTag tag, const QByteArray &string)
{
writeUInt16(tag);
writeUInt16(string.length());
dev->write(string);
}
void QPAGenerator::writeTaggedUInt32(QFontEngineQPA::HeaderTag tag, quint32 value)
{
writeUInt16(tag);
writeUInt16(sizeof(value));
writeUInt32(value);
}
void QPAGenerator::writeTaggedUInt8(QFontEngineQPA::HeaderTag tag, quint8 value)
{
writeUInt16(tag);
writeUInt16(sizeof(value));
writeUInt8(value);
}
void QPAGenerator::writeTaggedQFixed(QFontEngineQPA::HeaderTag tag, QFixed value)
{
writeUInt16(tag);
writeUInt16(sizeof(quint32));
writeUInt32(value.value());
}
/*
Creates a new multi QPA engine.
This function takes ownership of the QFontEngine, increasing it's refcount.
*/
QFontEngineMultiQPA::QFontEngineMultiQPA(QFontEngine *fe, int _script, const QStringList &fallbacks)
: QFontEngineMulti(fallbacks.size() + 1),
fallbackFamilies(fallbacks), script(_script)
{
engines[0] = fe;
fe->ref.ref();
fontDef = engines[0]->fontDef;
}
void QFontEngineMultiQPA::loadEngine(int at)
{
Q_ASSERT(at < engines.size());
Q_ASSERT(engines.at(at) == 0);
QFontDef request = fontDef;
request.styleStrategy |= QFont::NoFontMerging;
request.family = fallbackFamilies.at(at-1);
engines[at] = QFontDatabase::findFont(script,
/*fontprivate*/0,
request);
Q_ASSERT(engines[at]);
engines[at]->ref.ref();
engines[at]->fontDef = request;
}
QT_END_NAMESPACE
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