628 lines
20 KiB
C++
628 lines
20 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qfontengine_qpf2_p.h"
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#include <QtCore/QFile>
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#include <QtCore/QFileInfo>
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#include <QtCore/QDir>
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#include <QtCore/QBuffer>
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#include <QtCore/private/qstringiterator_p.h>
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#include <QtGui/private/qpaintengine_raster_p.h>
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#include <QtGui/private/qguiapplication_p.h>
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#include <qpa/qplatformfontdatabase.h>
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#include <qpa/qplatformintegration.h>
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QT_BEGIN_NAMESPACE
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//#define DEBUG_HEADER
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//#define DEBUG_FONTENGINE
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static const QFontEngineQPF2::TagType tagTypes[QFontEngineQPF2::NumTags] = {
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QFontEngineQPF2::StringType, // FontName
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QFontEngineQPF2::StringType, // FileName
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QFontEngineQPF2::UInt32Type, // FileIndex
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QFontEngineQPF2::UInt32Type, // FontRevision
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QFontEngineQPF2::StringType, // FreeText
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QFontEngineQPF2::FixedType, // Ascent
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QFontEngineQPF2::FixedType, // Descent
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QFontEngineQPF2::FixedType, // Leading
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QFontEngineQPF2::FixedType, // XHeight
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QFontEngineQPF2::FixedType, // AverageCharWidth
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QFontEngineQPF2::FixedType, // MaxCharWidth
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QFontEngineQPF2::FixedType, // LineThickness
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QFontEngineQPF2::FixedType, // MinLeftBearing
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QFontEngineQPF2::FixedType, // MinRightBearing
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QFontEngineQPF2::FixedType, // UnderlinePosition
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QFontEngineQPF2::UInt8Type, // GlyphFormat
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QFontEngineQPF2::UInt8Type, // PixelSize
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QFontEngineQPF2::UInt8Type, // Weight
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QFontEngineQPF2::UInt8Type, // Style
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QFontEngineQPF2::StringType, // EndOfHeader
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QFontEngineQPF2::BitFieldType// WritingSystems
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};
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#if defined(DEBUG_HEADER)
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# define DEBUG_VERIFY qDebug
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#else
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# define DEBUG_VERIFY if (0) qDebug
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#endif
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#define READ_VERIFY(type, variable) \
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if (tagPtr + sizeof(type) > endPtr) { \
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DEBUG_VERIFY() << "read verify failed in line" << __LINE__; \
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return 0; \
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} \
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variable = qFromBigEndian<type>(tagPtr); \
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DEBUG_VERIFY() << "read value" << variable << "of type " #type; \
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tagPtr += sizeof(type)
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template <typename T>
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T readValue(const uchar *&data)
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{
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T value = qFromBigEndian<T>(data);
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data += sizeof(T);
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return value;
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}
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#define VERIFY(condition) \
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if (!(condition)) { \
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DEBUG_VERIFY() << "condition " #condition " failed in line" << __LINE__; \
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return 0; \
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}
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#define VERIFY_TAG(condition) \
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if (!(condition)) { \
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DEBUG_VERIFY() << "verifying tag condition " #condition " failed in line" << __LINE__ << "with tag" << tag; \
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return 0; \
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}
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static inline const uchar *verifyTag(const uchar *tagPtr, const uchar *endPtr)
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{
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quint16 tag, length;
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READ_VERIFY(quint16, tag);
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READ_VERIFY(quint16, length);
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if (tag == QFontEngineQPF2::Tag_EndOfHeader)
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return endPtr;
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if (tag < QFontEngineQPF2::NumTags) {
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switch (tagTypes[tag]) {
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case QFontEngineQPF2::BitFieldType:
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case QFontEngineQPF2::StringType:
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// can't do anything...
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break;
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case QFontEngineQPF2::UInt32Type:
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VERIFY_TAG(length == sizeof(quint32));
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break;
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case QFontEngineQPF2::FixedType:
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VERIFY_TAG(length == sizeof(quint32));
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break;
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case QFontEngineQPF2::UInt8Type:
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VERIFY_TAG(length == sizeof(quint8));
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break;
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}
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#if defined(DEBUG_HEADER)
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if (length == 1)
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qDebug() << "tag data" << hex << *tagPtr;
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else if (length == 4)
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qDebug() << "tag data" << hex << tagPtr[0] << tagPtr[1] << tagPtr[2] << tagPtr[3];
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#endif
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}
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return tagPtr + length;
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}
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const QFontEngineQPF2::Glyph *QFontEngineQPF2::findGlyph(glyph_t g) const
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{
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if (!g || g >= glyphMapEntries)
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return 0;
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const quint32 *gmapPtr = reinterpret_cast<const quint32 *>(fontData + glyphMapOffset);
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quint32 glyphPos = qFromBigEndian<quint32>(gmapPtr[g]);
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if (glyphPos > glyphDataSize) {
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if (glyphPos == 0xffffffff)
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return 0;
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#if defined(DEBUG_FONTENGINE)
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qDebug() << "glyph" << g << "outside of glyphData, remapping font file";
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#endif
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if (glyphPos > glyphDataSize)
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return 0;
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}
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return reinterpret_cast<const Glyph *>(fontData + glyphDataOffset + glyphPos);
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}
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bool QFontEngineQPF2::verifyHeader(const uchar *data, int size)
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{
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VERIFY(quintptr(data) % Q_ALIGNOF(Header) == 0);
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VERIFY(size >= int(sizeof(Header)));
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const Header *header = reinterpret_cast<const Header *>(data);
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if (header->magic[0] != 'Q'
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|| header->magic[1] != 'P'
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|| header->magic[2] != 'F'
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|| header->magic[3] != '2')
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return false;
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VERIFY(header->majorVersion <= CurrentMajorVersion);
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const quint16 dataSize = qFromBigEndian<quint16>(header->dataSize);
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VERIFY(size >= int(sizeof(Header)) + dataSize);
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const uchar *tagPtr = data + sizeof(Header);
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const uchar *tagEndPtr = tagPtr + dataSize;
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while (tagPtr < tagEndPtr - 3) {
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tagPtr = verifyTag(tagPtr, tagEndPtr);
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VERIFY(tagPtr);
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}
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VERIFY(tagPtr <= tagEndPtr);
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return true;
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}
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QVariant QFontEngineQPF2::extractHeaderField(const uchar *data, HeaderTag requestedTag)
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{
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const Header *header = reinterpret_cast<const Header *>(data);
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const uchar *tagPtr = data + sizeof(Header);
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const uchar *endPtr = tagPtr + qFromBigEndian<quint16>(header->dataSize);
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while (tagPtr < endPtr - 3) {
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quint16 tag = readValue<quint16>(tagPtr);
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quint16 length = readValue<quint16>(tagPtr);
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if (tag == requestedTag) {
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switch (tagTypes[requestedTag]) {
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case StringType:
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return QVariant(QString::fromUtf8(reinterpret_cast<const char *>(tagPtr), length));
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case UInt32Type:
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return QVariant(readValue<quint32>(tagPtr));
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case UInt8Type:
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return QVariant(uint(*tagPtr));
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case FixedType:
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return QVariant(QFixed::fromFixed(readValue<quint32>(tagPtr)).toReal());
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case BitFieldType:
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return QVariant(QByteArray(reinterpret_cast<const char *>(tagPtr), length));
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}
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return QVariant();
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} else if (tag == Tag_EndOfHeader) {
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break;
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}
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tagPtr += length;
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}
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return QVariant();
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}
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QFontEngineQPF2::QFontEngineQPF2(const QFontDef &def, const QByteArray &data)
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: QFontEngine(QPF2),
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fontData(reinterpret_cast<const uchar *>(data.constData())), dataSize(data.size())
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{
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fontDef = def;
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cache_cost = 100;
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cmap = 0;
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cmapOffset = 0;
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cmapSize = 0;
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glyphMapOffset = 0;
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glyphMapEntries = 0;
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glyphDataOffset = 0;
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glyphDataSize = 0;
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kerning_pairs_loaded = false;
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readOnly = true;
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#if defined(DEBUG_FONTENGINE)
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qDebug() << "QFontEngineQPF2::QFontEngineQPF2( fd =" << fd << ", renderingFontEngine =" << renderingFontEngine << ')';
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#endif
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if (!verifyHeader(fontData, dataSize)) {
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#if defined(DEBUG_FONTENGINE)
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qDebug("verifyHeader failed!");
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#endif
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return;
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}
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const Header *header = reinterpret_cast<const Header *>(fontData);
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readOnly = (header->lock == 0xffffffff);
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const uchar *imgData = fontData + sizeof(Header) + qFromBigEndian<quint16>(header->dataSize);
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const uchar *endPtr = fontData + dataSize;
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while (imgData <= endPtr - 8) {
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quint16 blockTag = readValue<quint16>(imgData);
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imgData += 2; // skip padding
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quint32 blockSize = readValue<quint32>(imgData);
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if (blockTag == CMapBlock) {
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cmapOffset = imgData - fontData;
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cmapSize = blockSize;
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} else if (blockTag == GMapBlock) {
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glyphMapOffset = imgData - fontData;
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glyphMapEntries = blockSize / 4;
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} else if (blockTag == GlyphBlock) {
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glyphDataOffset = imgData - fontData;
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glyphDataSize = blockSize;
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}
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imgData += blockSize;
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}
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face_id.filename = QFile::encodeName(extractHeaderField(fontData, Tag_FileName).toString());
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face_id.index = extractHeaderField(fontData, Tag_FileIndex).toInt();
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// get the real cmap
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if (cmapOffset) {
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cmap = QFontEngine::getCMap(fontData + cmapOffset, cmapSize, &symbol, &cmapSize);
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cmapOffset = cmap ? cmap - fontData : 0;
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}
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// verify all the positions in the glyphMap
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if (glyphMapOffset) {
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const quint32 *gmapPtr = reinterpret_cast<const quint32 *>(fontData + glyphMapOffset);
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for (uint i = 0; i < glyphMapEntries; ++i) {
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quint32 glyphDataPos = qFromBigEndian<quint32>(gmapPtr[i]);
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if (glyphDataPos == 0xffffffff)
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continue;
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if (glyphDataPos >= glyphDataSize) {
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// error
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glyphMapOffset = 0;
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glyphMapEntries = 0;
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break;
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}
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}
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}
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#if defined(DEBUG_FONTENGINE)
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if (!isValid())
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qDebug() << "fontData" << fontData << "dataSize" << dataSize
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<< "cmap" << cmap << "cmapOffset" << cmapOffset
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<< "glyphMapOffset" << glyphMapOffset << "glyphDataOffset" << glyphDataOffset
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<< "fd" << fd << "glyphDataSize" << glyphDataSize;
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#endif
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}
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QFontEngineQPF2::~QFontEngineQPF2()
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{
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}
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bool QFontEngineQPF2::getSfntTableData(uint tag, uchar *buffer, uint *length) const
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{
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if (tag != MAKE_TAG('c', 'm', 'a', 'p') || !cmap)
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return false;
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if (buffer && int(*length) >= cmapSize)
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memcpy(buffer, cmap, cmapSize);
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*length = cmapSize;
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Q_ASSERT(int(*length) > 0);
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return true;
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}
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glyph_t QFontEngineQPF2::glyphIndex(uint ucs4) const
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{
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glyph_t glyph = getTrueTypeGlyphIndex(cmap, cmapSize, ucs4);
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if (glyph == 0 && symbol && ucs4 < 0x100)
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glyph = getTrueTypeGlyphIndex(cmap, cmapSize, ucs4 + 0xf000);
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if (!findGlyph(glyph))
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glyph = 0;
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return glyph;
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}
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bool QFontEngineQPF2::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QFontEngine::ShaperFlags flags) const
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{
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Q_ASSERT(glyphs->numGlyphs >= *nglyphs);
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if (*nglyphs < len) {
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*nglyphs = len;
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return false;
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}
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#if defined(DEBUG_FONTENGINE)
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QSet<QChar> seenGlyphs;
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#endif
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int glyph_pos = 0;
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if (symbol) {
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QStringIterator it(str, str + len);
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while (it.hasNext()) {
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const uint uc = it.next();
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glyphs->glyphs[glyph_pos] = getTrueTypeGlyphIndex(cmap, cmapSize, uc);
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if(!glyphs->glyphs[glyph_pos] && uc < 0x100)
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glyphs->glyphs[glyph_pos] = getTrueTypeGlyphIndex(cmap, cmapSize, uc + 0xf000);
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++glyph_pos;
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}
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} else {
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QStringIterator it(str, str + len);
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while (it.hasNext()) {
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const uint uc = it.next();
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glyphs->glyphs[glyph_pos] = getTrueTypeGlyphIndex(cmap, cmapSize, uc);
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#if 0 && defined(DEBUG_FONTENGINE)
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QChar c(uc);
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if (!findGlyph(glyphs[glyph_pos].glyph) && !seenGlyphs.contains(c))
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qDebug() << "glyph for character" << c << '/' << hex << uc << "is" << dec << glyphs[glyph_pos].glyph;
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seenGlyphs.insert(c);
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#endif
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++glyph_pos;
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}
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}
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*nglyphs = glyph_pos;
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glyphs->numGlyphs = glyph_pos;
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if (!(flags & GlyphIndicesOnly))
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recalcAdvances(glyphs, flags);
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return true;
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}
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void QFontEngineQPF2::recalcAdvances(QGlyphLayout *glyphs, QFontEngine::ShaperFlags) const
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{
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for (int i = 0; i < glyphs->numGlyphs; ++i) {
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const Glyph *g = findGlyph(glyphs->glyphs[i]);
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if (!g)
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continue;
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glyphs->advances[i] = g->advance;
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}
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}
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QImage QFontEngineQPF2::alphaMapForGlyph(glyph_t g)
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{
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const Glyph *glyph = findGlyph(g);
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if (!glyph)
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return QImage();
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const uchar *bits = ((const uchar *) glyph) + sizeof(Glyph);
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QImage image(bits,glyph->width, glyph->height, glyph->bytesPerLine, QImage::Format_Alpha8);
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return image;
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}
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void QFontEngineQPF2::addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, QPainterPath *path, QTextItem::RenderFlags flags)
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{
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addBitmapFontToPath(x, y, glyphs, path, flags);
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}
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glyph_metrics_t QFontEngineQPF2::boundingBox(const QGlyphLayout &glyphs)
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{
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glyph_metrics_t overall;
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// initialize with line height, we get the same behaviour on all platforms
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overall.y = -ascent();
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overall.height = ascent() + descent() + 1;
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QFixed ymax = 0;
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QFixed xmax = 0;
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for (int i = 0; i < glyphs.numGlyphs; i++) {
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const Glyph *g = findGlyph(glyphs.glyphs[i]);
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if (!g)
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continue;
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QFixed x = overall.xoff + glyphs.offsets[i].x + g->x;
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QFixed y = overall.yoff + glyphs.offsets[i].y + g->y;
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overall.x = qMin(overall.x, x);
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overall.y = qMin(overall.y, y);
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xmax = qMax(xmax, x + g->width);
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ymax = qMax(ymax, y + g->height);
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overall.xoff += g->advance;
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}
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overall.height = qMax(overall.height, ymax - overall.y);
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overall.width = xmax - overall.x;
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return overall;
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}
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glyph_metrics_t QFontEngineQPF2::boundingBox(glyph_t glyph)
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{
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glyph_metrics_t overall;
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const Glyph *g = findGlyph(glyph);
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if (!g)
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return overall;
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overall.x = g->x;
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overall.y = g->y;
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overall.width = g->width;
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overall.height = g->height;
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overall.xoff = g->advance;
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return overall;
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}
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QFixed QFontEngineQPF2::ascent() const
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{
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return QFixed::fromReal(extractHeaderField(fontData, Tag_Ascent).value<qreal>());
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}
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QFixed QFontEngineQPF2::capHeight() const
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{
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return calculatedCapHeight();
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}
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QFixed QFontEngineQPF2::descent() const
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{
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return QFixed::fromReal(extractHeaderField(fontData, Tag_Descent).value<qreal>());
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}
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QFixed QFontEngineQPF2::leading() const
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{
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return QFixed::fromReal(extractHeaderField(fontData, Tag_Leading).value<qreal>());
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}
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qreal QFontEngineQPF2::maxCharWidth() const
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{
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return extractHeaderField(fontData, Tag_MaxCharWidth).value<qreal>();
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}
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qreal QFontEngineQPF2::minLeftBearing() const
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{
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return extractHeaderField(fontData, Tag_MinLeftBearing).value<qreal>();
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}
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qreal QFontEngineQPF2::minRightBearing() const
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{
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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>(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
|