summaryrefslogtreecommitdiffstats
path: root/src/gui/text/qfontengine_s60.cpp
blob: 52a1fe70b1cc9d80aafaee56ad858ade49bd1de0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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, 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qfontengine_s60_p.h"
#include "qtextengine_p.h"
#include "qglobal.h"
#include <private/qapplication_p.h>
#include "qimage.h"
#include <private/qt_s60_p.h>

#include <e32base.h>
#include <e32std.h>
#include <eikenv.h>
#include <gdi.h>
#if defined(Q_SYMBIAN_HAS_FONTTABLE_API) || defined(Q_SYMBIAN_HAS_GLYPHOUTLINE_API)
#include <graphics/gdi/gdiplatapi.h>
#endif // Q_SYMBIAN_HAS_FONTTABLE_API || Q_SYMBIAN_HAS_GLYPHOUTLINE_API

QT_BEGIN_NAMESPACE

#ifdef Q_SYMBIAN_HAS_FONTTABLE_API
QSymbianTypeFaceExtras::QSymbianTypeFaceExtras(CFont* cFont, COpenFont *openFont)
    : m_cFont(cFont)
    , m_symbolCMap(false)
{
    Q_UNUSED(openFont)
}

QSymbianTypeFaceExtras::~QSymbianTypeFaceExtras()
{
    S60->screenDevice()->ReleaseFont(m_cFont);
}

QByteArray QSymbianTypeFaceExtras::getSfntTable(uint tag) const
{
    RFontTable fontTable;
    if (fontTable.Open(*m_cFont, tag) != KErrNone)
        return QByteArray();
    const QByteArray byteArray(reinterpret_cast<const char *>
            (fontTable.TableContent()),fontTable.TableLength());
    fontTable.Close();
    return byteArray;
}

bool QSymbianTypeFaceExtras::getSfntTableData(uint tag, uchar *buffer, uint *length) const
{
    RFontTable fontTable;
    if (fontTable.Open(*m_cFont, tag) != KErrNone)
        return false;

    bool result = true;
    const TInt tableByteLength = fontTable.TableLength();

    if (*length > 0 && *length < tableByteLength) {
        result = false; // Caller did not allocate enough memory
    } else {
        *length = tableByteLength;
        if (buffer)
            memcpy(buffer, fontTable.TableContent(), tableByteLength);
    }

    fontTable.Close();
    return result;
}

#else // Q_SYMBIAN_HAS_FONTTABLE_API
QSymbianTypeFaceExtras::QSymbianTypeFaceExtras(CFont* cFont, COpenFont *openFont)
    : m_cFont(cFont)
    , m_symbolCMap(false)
    , m_openFont(openFont)
{
    TAny *trueTypeExtension = NULL;
    m_openFont->ExtendedInterface(KUidOpenFontTrueTypeExtension, trueTypeExtension);
    m_trueTypeExtension = static_cast<MOpenFontTrueTypeExtension*>(trueTypeExtension);
    Q_ASSERT(m_trueTypeExtension);
}

QSymbianTypeFaceExtras::~QSymbianTypeFaceExtras()
{
}

QByteArray QSymbianTypeFaceExtras::getSfntTable(uint tag) const
{
    Q_ASSERT(m_trueTypeExtension->HasTrueTypeTable(tag));
    TInt error = KErrNone;
    TInt tableByteLength = 0;
    TAny *table = q_check_ptr(m_trueTypeExtension->GetTrueTypeTable(error, tag, &tableByteLength));
    QByteArray result(static_cast<const char*>(table), tableByteLength);
    m_trueTypeExtension->ReleaseTrueTypeTable(table);
    return result;
}

bool QSymbianTypeFaceExtras::getSfntTableData(uint tag, uchar *buffer, uint *length) const
{
    if (!m_trueTypeExtension->HasTrueTypeTable(tag))
        return false;

    bool result = true;
    TInt error = KErrNone;
    TInt tableByteLength;
    TAny *table =
        q_check_ptr(m_trueTypeExtension->GetTrueTypeTable(error, tag, &tableByteLength));

    if (error != KErrNone) {
        return false;
    } else if (*length > 0 && *length < tableByteLength) {
        result = false; // Caller did not allocate enough memory
    } else {
        *length = tableByteLength;
        if (buffer)
            memcpy(buffer, table, tableByteLength);
    }

    m_trueTypeExtension->ReleaseTrueTypeTable(table);
    return result;
}
#endif // Q_SYMBIAN_HAS_FONTTABLE_API

const uchar *QSymbianTypeFaceExtras::cmap() const
{
    if (m_cmapTable.isNull()) {
        const QByteArray cmapTable = getSfntTable(MAKE_TAG('c', 'm', 'a', 'p'));
        int size = 0;
        const uchar *cmap = QFontEngine::getCMap(reinterpret_cast<const uchar *>
                (cmapTable.constData()), cmapTable.size(), &m_symbolCMap, &size);
        m_cmapTable = QByteArray(reinterpret_cast<const char *>(cmap), size);
    }
    return reinterpret_cast<const uchar *>(m_cmapTable.constData());
}

CFont *QSymbianTypeFaceExtras::fontOwner() const
{
    return m_cFont;
}

// duplicated from qfontengine_xyz.cpp
static inline unsigned int getChar(const QChar *str, int &i, const int len)
{
    unsigned int uc = str[i].unicode();
    if (uc >= 0xd800 && uc < 0xdc00 && i < len-1) {
        uint low = str[i+1].unicode();
       if (low >= 0xdc00 && low < 0xe000) {
            uc = (uc - 0xd800)*0x400 + (low - 0xdc00) + 0x10000;
            ++i;
        }
    }
    return uc;
}

CFont *QFontEngineS60::fontWithSize(qreal size) const
{
    CFont *result = 0;
    TFontSpec fontSpec(qt_QString2TPtrC(QFontEngine::fontDef.family), TInt(size));
    fontSpec.iFontStyle.SetBitmapType(EAntiAliasedGlyphBitmap);
    fontSpec.iFontStyle.SetPosture(QFontEngine::fontDef.style == QFont::StyleNormal?EPostureUpright:EPostureItalic);
    fontSpec.iFontStyle.SetStrokeWeight(QFontEngine::fontDef.weight > QFont::Normal?EStrokeWeightBold:EStrokeWeightNormal);
    const TInt errorCode = S60->screenDevice()->GetNearestFontToDesignHeightInPixels(result, fontSpec);
    Q_ASSERT(result && (errorCode == 0));
    return result;
}

void QFontEngineS60::setFontScale(qreal scale)
{
    if (qFuzzyCompare(scale, qreal(1))) {
        if (!m_originalFont)
            m_originalFont = fontWithSize(m_originalFontSizeInPixels);
        m_activeFont = m_originalFont;
    } else {
        const qreal scaledFontSizeInPixels = m_originalFontSizeInPixels * scale;
        if (!m_scaledFont ||
                (TInt(scaledFontSizeInPixels) != TInt(m_scaledFontSizeInPixels))) {
            releaseFont(m_scaledFont);
            m_scaledFontSizeInPixels = scaledFontSizeInPixels;
            m_scaledFont = fontWithSize(m_scaledFontSizeInPixels);
        }
        m_activeFont = m_scaledFont;
    }
}

void QFontEngineS60::releaseFont(CFont *&font)
{
    if (font) {
        S60->screenDevice()->ReleaseFont(font);
        font = 0;
    }
}

QFontEngineS60::QFontEngineS60(const QFontDef &request, const QSymbianTypeFaceExtras *extras)
    : m_extras(extras)
    , m_originalFont(0)
    , m_originalFontSizeInPixels((request.pixelSize >= 0)?
            request.pixelSize:pointsToPixels(request.pointSize))
    , m_scaledFont(0)
    , m_scaledFontSizeInPixels(0)
    , m_activeFont(0)
{
    QFontEngine::fontDef = request;
    setFontScale(1.0);
    cache_cost = sizeof(QFontEngineS60);
}

QFontEngineS60::~QFontEngineS60()
{
    releaseFont(m_originalFont);
    releaseFont(m_scaledFont);
}

bool QFontEngineS60::stringToCMap(const QChar *characters, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const
{
    if (*nglyphs < len) {
        *nglyphs = len;
        return false;
    }

    HB_Glyph *g = glyphs->glyphs;
    const unsigned char* cmap = m_extras->cmap();
    const bool isRtl = (flags & QTextEngine::RightToLeft);
    for (int i = 0; i < len; ++i) {
        const unsigned int uc = getChar(characters, i, len);
        *g++ = QFontEngine::getTrueTypeGlyphIndex(cmap,
        		isRtl ? QChar::mirroredChar(uc) : uc);
    }

    glyphs->numGlyphs = g - glyphs->glyphs;
    *nglyphs = glyphs->numGlyphs;

    if (flags & QTextEngine::GlyphIndicesOnly)
        return true;

    recalcAdvances(glyphs, flags);
    return true;
}

void QFontEngineS60::recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags flags) const
{
    Q_UNUSED(flags);
    for (int i = 0; i < glyphs->numGlyphs; i++) {
        const glyph_metrics_t bbox = boundingBox_const(glyphs->glyphs[i]);
        glyphs->advances_x[i] = bbox.xoff;
        glyphs->advances_y[i] = bbox.yoff;
    }
}

#ifdef Q_SYMBIAN_HAS_GLYPHOUTLINE_API
static bool parseGlyphPathData(const char *dataStr, const char *dataEnd, QPainterPath &path,
                               qreal fontPixelSize, const QPointF &offset, bool hinted);
#endif //Q_SYMBIAN_HAS_GLYPHOUTLINE_API

void QFontEngineS60::addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions,
                                     int nglyphs, QPainterPath *path,
                                     QTextItem::RenderFlags flags)
{
#ifdef Q_SYMBIAN_HAS_GLYPHOUTLINE_API
    Q_UNUSED(flags)
    RGlyphOutlineIterator iterator;
    const TInt error = iterator.Open(*m_activeFont, glyphs, nglyphs);
    if (KErrNone != error)
        return;
    const qreal fontSizeInPixels = qreal(m_activeFont->HeightInPixels());
    int count = 0;
    do {
        const TUint8* outlineUint8 = iterator.Outline();
        const char* const outlineChar = reinterpret_cast<const char*>(outlineUint8);
        const char* const outlineEnd = outlineChar + iterator.OutlineLength();
        parseGlyphPathData(outlineChar, outlineEnd, *path, fontSizeInPixels,
                positions[count++].toPointF(), false);
    } while(KErrNone == iterator.Next() && count <= nglyphs);
#else // Q_SYMBIAN_HAS_GLYPHOUTLINE_API
    QFontEngine::addGlyphsToPath(glyphs, positions, nglyphs, path, flags);
#endif //Q_SYMBIAN_HAS_GLYPHOUTLINE_API
}

QImage QFontEngineS60::alphaMapForGlyph(glyph_t glyph)
{
    TOpenFontCharMetrics metrics;
    const TUint8 *glyphBitmapBytes;
    TSize glyphBitmapSize;
    getCharacterData(glyph, metrics, glyphBitmapBytes, glyphBitmapSize);
    QImage result(glyphBitmapBytes, glyphBitmapSize.iWidth, glyphBitmapSize.iHeight, glyphBitmapSize.iWidth, QImage::Format_Indexed8);
    result.setColorTable(grayPalette());

    // The above setColorTable() call detached the image data anyway, so why not shape tha data a bit, while we can.
    // CFont::GetCharacterData() returns 8-bit data that obviously was 4-bit data before, and converted to 8-bit incorrectly.
    // The data values are 0x00, 0x10 ... 0xe0, 0xf0. So, a real opaque 0xff is never reached, which we get punished
    // for every time we want to blit this glyph in the raster paint engine.
    // "Fix" is to convert all 0xf0 to 0xff. Is fine, quality wise, and I assume faster than correcting all values.
    // Blitting is however, evidentially faster now.
    const int bpl = result.bytesPerLine();
    for (int row = 0; row < result.height(); ++row) {
        uchar *scanLine = result.scanLine(row);
        for (int column = 0; column < bpl; ++column) {
            if (*scanLine == 0xf0)
                *scanLine = 0xff;
            scanLine++;
        }
    }

    return result;
}

glyph_metrics_t QFontEngineS60::boundingBox(const QGlyphLayout &glyphs)
{
   if (glyphs.numGlyphs == 0)
        return glyph_metrics_t();

    QFixed w = 0;
    for (int i = 0; i < glyphs.numGlyphs; ++i)
        w += glyphs.effectiveAdvance(i);

    return glyph_metrics_t(0, -ascent(), w, ascent()+descent()+1, w, 0);
}

glyph_metrics_t QFontEngineS60::boundingBox_const(glyph_t glyph) const
{
    TOpenFontCharMetrics metrics;
    const TUint8 *glyphBitmapBytes;
    TSize glyphBitmapSize;
    getCharacterData(glyph, metrics, glyphBitmapBytes, glyphBitmapSize);
    TRect glyphBounds;
    metrics.GetHorizBounds(glyphBounds);
    const glyph_metrics_t result(
        glyphBounds.iTl.iX,
        glyphBounds.iTl.iY,
        glyphBounds.Width(),
        glyphBounds.Height(),
        metrics.HorizAdvance(),
        0
    );
    return result;
}

glyph_metrics_t QFontEngineS60::boundingBox(glyph_t glyph)
{
    return boundingBox_const(glyph);
}

QFixed QFontEngineS60::ascent() const
{
    // Workaround for QTBUG-8013
    // Stroke based fonts may return an incorrect FontMaxAscent of 0.
    const QFixed ascent = m_originalFont->FontMaxAscent();
    return (ascent > 0) ? ascent : QFixed::fromReal(m_originalFontSizeInPixels) - descent();
}

QFixed QFontEngineS60::descent() const
{
    return m_originalFont->FontMaxDescent();
}

QFixed QFontEngineS60::leading() const
{
    return 0;
}

qreal QFontEngineS60::maxCharWidth() const
{
    return m_originalFont->MaxCharWidthInPixels();
}

const char *QFontEngineS60::name() const
{
    return "QFontEngineS60";
}

bool QFontEngineS60::canRender(const QChar *string, int len)
{
    const unsigned char *cmap = m_extras->cmap();
    for (int i = 0; i < len; ++i) {
        const unsigned int uc = getChar(string, i, len);
        if (QFontEngine::getTrueTypeGlyphIndex(cmap, uc) == 0)
            return false;
    }
    return true;
}

QByteArray QFontEngineS60::getSfntTable(uint tag) const
{
    return m_extras->getSfntTable(tag);
}

bool QFontEngineS60::getSfntTableData(uint tag, uchar *buffer, uint *length) const
{
    return m_extras->getSfntTableData(tag, buffer, length);
}

QFontEngine::Type QFontEngineS60::type() const
{
    return QFontEngine::S60FontEngine;
}

void QFontEngineS60::getCharacterData(glyph_t glyph, TOpenFontCharMetrics& metrics, const TUint8*& bitmap, TSize& bitmapSize) const
{
    // Setting the most significant bit tells GetCharacterData
    // that 'code' is a Glyph ID, rather than a UTF-16 value
    const TUint specialCode = (TUint)glyph | 0x80000000;

    const CFont::TCharacterDataAvailability availability =
            m_activeFont->GetCharacterData(specialCode, metrics, bitmap, bitmapSize);
    const glyph_t fallbackGlyph = '?';
    if (availability != CFont::EAllCharacterData) {
        const CFont::TCharacterDataAvailability fallbackAvailability =
                m_activeFont->GetCharacterData(fallbackGlyph, metrics, bitmap, bitmapSize);
        Q_ASSERT(fallbackAvailability == CFont::EAllCharacterData);
    }
}

#ifdef Q_SYMBIAN_HAS_GLYPHOUTLINE_API
static inline void skipSpacesAndComma(const char* &str, const char* const strEnd)
{
    while (str <= strEnd && (*str == ' ' || *str == ','))
        ++str;
}

static bool parseGlyphPathData(const char *svgPath, const char *svgPathEnd, QPainterPath &path,
                               qreal fontPixelSize, const QPointF &offset, bool hinted)
{
    Q_UNUSED(hinted)
    QPointF p1, p2, firstSubPathPoint;
    qreal *elementValues[] =
        {&p1.rx(), &p1.ry(), &p2.rx(), &p2.ry()};
    const int unitsPerEm = 2048; // See: http://en.wikipedia.org/wiki/Em_%28typography%29
    const qreal resizeFactor = fontPixelSize / unitsPerEm;

    while (svgPath < svgPathEnd) {
        skipSpacesAndComma(svgPath, svgPathEnd);
        const char pathElem = *svgPath++;
        skipSpacesAndComma(svgPath, svgPathEnd);

        if (pathElem != 'Z') {
            char *endStr = 0;
            int elementValuesCount = 0;
            for (int i = 0; i < 4; ++i) { // 4 = size of elementValues[]
                qreal coordinateValue = strtod(svgPath, &endStr);
                if (svgPath == endStr)
                    break;
                if (i % 2) // Flip vertically
                    coordinateValue = -coordinateValue;
                *elementValues[i] = coordinateValue * resizeFactor;
                elementValuesCount++;
                svgPath = endStr;
                skipSpacesAndComma(svgPath, svgPathEnd);
            }
            p1 += offset;
            if (elementValuesCount == 2)
                p2 = firstSubPathPoint;
            else
                p2 += offset;
        }

        switch (pathElem) {
        case 'M':
            firstSubPathPoint = p1;
            path.moveTo(p1);
            break;
        case 'Z':
            path.closeSubpath();
            break;
        case 'L':
            path.lineTo(p1);
            break;
        case 'Q':
            path.quadTo(p1, p2);
            break;
        default:
            return false;
        }
    }
    return true;
}
#endif // Q_SYMBIAN_HAS_GLYPHOUTLINE_API

QT_END_NAMESPACE