diff options
Diffstat (limited to 'src/gui/text/qfontengine_qpf2.cpp')
| -rw-r--r-- | src/gui/text/qfontengine_qpf2.cpp | 624 |
1 files changed, 624 insertions, 0 deletions
diff --git a/src/gui/text/qfontengine_qpf2.cpp b/src/gui/text/qfontengine_qpf2.cpp new file mode 100644 index 0000000000..bcb128baac --- /dev/null +++ b/src/gui/text/qfontengine_qpf2.cpp @@ -0,0 +1,624 @@ +/**************************************************************************** +** +** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, 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, Digia gives you certain additional +** rights. These rights are described in the Digia 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. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qfontengine_qpf2_p.h" + +#include <QtCore/QFile> +#include <QtCore/QFileInfo> +#include <QtCore/QDir> +#include <QtCore/QBuffer> +#include <QtCore/private/qstringiterator_p.h> + +#include <QtGui/private/qpaintengine_raster_p.h> +#include <QtGui/private/qguiapplication_p.h> +#include <qpa/qplatformfontdatabase.h> +#include <qpa/qplatformintegration.h> + +QT_BEGIN_NAMESPACE + +//#define DEBUG_HEADER +//#define DEBUG_FONTENGINE + +static QFontEngineQPF2::TagType tagTypes[QFontEngineQPF2::NumTags] = { + QFontEngineQPF2::StringType, // FontName + QFontEngineQPF2::StringType, // FileName + QFontEngineQPF2::UInt32Type, // FileIndex + QFontEngineQPF2::UInt32Type, // FontRevision + QFontEngineQPF2::StringType, // FreeText + QFontEngineQPF2::FixedType, // Ascent + QFontEngineQPF2::FixedType, // Descent + QFontEngineQPF2::FixedType, // Leading + QFontEngineQPF2::FixedType, // XHeight + QFontEngineQPF2::FixedType, // AverageCharWidth + QFontEngineQPF2::FixedType, // MaxCharWidth + QFontEngineQPF2::FixedType, // LineThickness + QFontEngineQPF2::FixedType, // MinLeftBearing + QFontEngineQPF2::FixedType, // MinRightBearing + QFontEngineQPF2::FixedType, // UnderlinePosition + QFontEngineQPF2::UInt8Type, // GlyphFormat + QFontEngineQPF2::UInt8Type, // PixelSize + QFontEngineQPF2::UInt8Type, // Weight + QFontEngineQPF2::UInt8Type, // Style + QFontEngineQPF2::StringType, // EndOfHeader + QFontEngineQPF2::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 == QFontEngineQPF2::Tag_EndOfHeader) + return endPtr; + if (tag < QFontEngineQPF2::NumTags) { + switch (tagTypes[tag]) { + case QFontEngineQPF2::BitFieldType: + case QFontEngineQPF2::StringType: + // can't do anything... + break; + case QFontEngineQPF2::UInt32Type: + VERIFY_TAG(length == sizeof(quint32)); + break; + case QFontEngineQPF2::FixedType: + VERIFY_TAG(length == sizeof(quint32)); + break; + case QFontEngineQPF2::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 QFontEngineQPF2::Glyph *QFontEngineQPF2::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 QFontEngineQPF2::verifyHeader(const uchar *data, int size) +{ + VERIFY(quintptr(data) % Q_ALIGNOF(Header) == 0); + 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 QFontEngineQPF2::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(); +} + + +QFontEngineQPF2::QFontEngineQPF2(const QFontDef &def, const QByteArray &data) + : QFontEngine(QPF2), + fontData(reinterpret_cast<const uchar *>(data.constData())), dataSize(data.size()) +{ + fontDef = def; + cache_cost = 100; + cmap = 0; + cmapOffset = 0; + cmapSize = 0; + glyphMapOffset = 0; + glyphMapEntries = 0; + glyphDataOffset = 0; + glyphDataSize = 0; + kerning_pairs_loaded = false; + readOnly = true; + +#if defined(DEBUG_FONTENGINE) + qDebug() << "QFontEngineQPF2::QFontEngineQPF2( 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) { + cmap = QFontEngine::getCMap(fontData + cmapOffset, cmapSize, &symbol, &cmapSize); + cmapOffset = cmap ? cmap - fontData : 0; + } + + // 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 + << "cmap" << cmap << "cmapOffset" << cmapOffset + << "glyphMapOffset" << glyphMapOffset << "glyphDataOffset" << glyphDataOffset + << "fd" << fd << "glyphDataSize" << glyphDataSize; +#endif +} + +QFontEngineQPF2::~QFontEngineQPF2() +{ +} + +bool QFontEngineQPF2::getSfntTableData(uint tag, uchar *buffer, uint *length) const +{ + if (tag != MAKE_TAG('c', 'm', 'a', 'p') || !cmap) + return false; + + if (buffer && int(*length) >= cmapSize) + memcpy(buffer, cmap, cmapSize); + *length = cmapSize; + Q_ASSERT(int(*length) > 0); + return true; +} + +glyph_t QFontEngineQPF2::glyphIndex(uint ucs4) const +{ + glyph_t glyph = getTrueTypeGlyphIndex(cmap, ucs4); + if (glyph == 0 && symbol && ucs4 < 0x100) + glyph = getTrueTypeGlyphIndex(cmap, ucs4 + 0xf000); + if (!findGlyph(glyph)) + glyph = 0; + + return glyph; +} + +bool QFontEngineQPF2::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QFontEngine::ShaperFlags flags) const +{ + Q_ASSERT(glyphs->numGlyphs >= *nglyphs); + if (*nglyphs < len) { + *nglyphs = len; + return false; + } + +#if defined(DEBUG_FONTENGINE) + QSet<QChar> seenGlyphs; +#endif + + int glyph_pos = 0; + if (symbol) { + QStringIterator it(str, str + len); + while (it.hasNext()) { + const uint uc = it.next(); + 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 { + QStringIterator it(str, str + len); + while (it.hasNext()) { + const uint uc = it.next(); + 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; + + if (!(flags & GlyphIndicesOnly)) + recalcAdvances(glyphs, flags); + + return true; +} + +void QFontEngineQPF2::recalcAdvances(QGlyphLayout *glyphs, QFontEngine::ShaperFlags) const +{ + for (int i = 0; i < glyphs->numGlyphs; ++i) { + const Glyph *g = findGlyph(glyphs->glyphs[i]); + if (!g) + continue; + glyphs->advances[i] = g->advance; + } +} + +QImage QFontEngineQPF2::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 QFontEngineQPF2::addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, QPainterPath *path, QTextItem::RenderFlags flags) +{ + addBitmapFontToPath(x, y, glyphs, path, flags); +} + +glyph_metrics_t QFontEngineQPF2::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 QFontEngineQPF2::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 QFontEngineQPF2::ascent() const +{ + return QFixed::fromReal(extractHeaderField(fontData, Tag_Ascent).value<qreal>()); +} + +QFixed QFontEngineQPF2::descent() const +{ + return QFixed::fromReal(extractHeaderField(fontData, Tag_Descent).value<qreal>()); +} + +QFixed QFontEngineQPF2::leading() const +{ + return QFixed::fromReal(extractHeaderField(fontData, Tag_Leading).value<qreal>()); +} + +qreal QFontEngineQPF2::maxCharWidth() const +{ + return extractHeaderField(fontData, Tag_MaxCharWidth).value<qreal>(); +} + +qreal QFontEngineQPF2::minLeftBearing() const +{ + return extractHeaderField(fontData, Tag_MinLeftBearing).value<qreal>(); +} + +qreal QFontEngineQPF2::minRightBearing() const +{ + return extractHeaderField(fontData, Tag_MinRightBearing).value<qreal>(); +} + +QFixed QFontEngineQPF2::underlinePosition() const +{ + return QFixed::fromReal(extractHeaderField(fontData, Tag_UnderlinePosition).value<qreal>()); +} + +QFixed QFontEngineQPF2::lineThickness() const +{ + return QFixed::fromReal(extractHeaderField(fontData, Tag_LineThickness).value<qreal>()); +} + +bool QFontEngineQPF2::isValid() const +{ + return fontData && dataSize && cmapOffset + && glyphMapOffset && glyphDataOffset && glyphDataSize > 0; +} + +void QPF2Generator::generate() +{ + writeHeader(); + writeGMap(); + writeBlock(QFontEngineQPF2::GlyphBlock, QByteArray()); + + dev->seek(4); // position of header.lock + writeUInt32(0); +} + +void QPF2Generator::writeHeader() +{ + QFontEngineQPF2::Header header; + + header.magic[0] = 'Q'; + header.magic[1] = 'P'; + header.magic[2] = 'F'; + header.magic[3] = '2'; + header.lock = 1; + header.majorVersion = QFontEngineQPF2::CurrentMajorVersion; + header.minorVersion = QFontEngineQPF2::CurrentMinorVersion; + header.dataSize = 0; + dev->write((const char *)&header, sizeof(header)); + + writeTaggedString(QFontEngineQPF2::Tag_FontName, fe->fontDef.family.toUtf8()); + + QFontEngine::FaceId face = fe->faceId(); + writeTaggedString(QFontEngineQPF2::Tag_FileName, face.filename); + writeTaggedUInt32(QFontEngineQPF2::Tag_FileIndex, face.index); + + { + const QByteArray head = fe->getSfntTable(MAKE_TAG('h', 'e', 'a', 'd')); + if (head.size() >= 4) { + const quint32 revision = qFromBigEndian<quint32>(reinterpret_cast<const uchar *>(head.constData())); + writeTaggedUInt32(QFontEngineQPF2::Tag_FontRevision, revision); + } + } + + writeTaggedQFixed(QFontEngineQPF2::Tag_Ascent, fe->ascent()); + writeTaggedQFixed(QFontEngineQPF2::Tag_Descent, fe->descent()); + writeTaggedQFixed(QFontEngineQPF2::Tag_Leading, fe->leading()); + writeTaggedQFixed(QFontEngineQPF2::Tag_XHeight, fe->xHeight()); + writeTaggedQFixed(QFontEngineQPF2::Tag_AverageCharWidth, fe->averageCharWidth()); + writeTaggedQFixed(QFontEngineQPF2::Tag_MaxCharWidth, QFixed::fromReal(fe->maxCharWidth())); + writeTaggedQFixed(QFontEngineQPF2::Tag_LineThickness, fe->lineThickness()); + writeTaggedQFixed(QFontEngineQPF2::Tag_MinLeftBearing, QFixed::fromReal(fe->minLeftBearing())); + writeTaggedQFixed(QFontEngineQPF2::Tag_MinRightBearing, QFixed::fromReal(fe->minRightBearing())); + writeTaggedQFixed(QFontEngineQPF2::Tag_UnderlinePosition, fe->underlinePosition()); + writeTaggedUInt8(QFontEngineQPF2::Tag_PixelSize, fe->fontDef.pixelSize); + writeTaggedUInt8(QFontEngineQPF2::Tag_Weight, fe->fontDef.weight); + writeTaggedUInt8(QFontEngineQPF2::Tag_Style, fe->fontDef.style); + + writeTaggedUInt8(QFontEngineQPF2::Tag_GlyphFormat, QFontEngineQPF2::AlphamapGlyphs); + + writeTaggedString(QFontEngineQPF2::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 QPF2Generator::writeGMap() +{ + const quint16 glyphCount = fe->glyphCount(); + + writeUInt16(QFontEngineQPF2::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); + memset(buffer.data() + pos, 0xff, numBytes); + dev->seek(pos + numBytes); +} + +void QPF2Generator::writeBlock(QFontEngineQPF2::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 QPF2Generator::writeTaggedString(QFontEngineQPF2::HeaderTag tag, const QByteArray &string) +{ + writeUInt16(tag); + writeUInt16(string.length()); + dev->write(string); +} + +void QPF2Generator::writeTaggedUInt32(QFontEngineQPF2::HeaderTag tag, quint32 value) +{ + writeUInt16(tag); + writeUInt16(sizeof(value)); + writeUInt32(value); +} + +void QPF2Generator::writeTaggedUInt8(QFontEngineQPF2::HeaderTag tag, quint8 value) +{ + writeUInt16(tag); + writeUInt16(sizeof(value)); + writeUInt8(value); +} + +void QPF2Generator::writeTaggedQFixed(QFontEngineQPF2::HeaderTag tag, QFixed value) +{ + writeUInt16(tag); + writeUInt16(sizeof(quint32)); + writeUInt32(value.value()); +} + +QT_END_NAMESPACE |