source: trunk/src/gui/text/qfontengine.cpp@ 815

Last change on this file since 815 was 769, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.6.3 sources from branches/vendor/nokia/qt.
File size: 50.3 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation (qt-info@nokia.com)
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7** This file is part of the QtGui module of the Qt Toolkit.
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21** ensure the GNU Lesser General Public License version 2.1 requirements
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40****************************************************************************/
41
42#include <qdebug.h>
43#include <private/qfontengine_p.h>
44
45#include "qbitmap.h"
46#include "qpainter.h"
47#include "qpainterpath.h"
48#include "qvarlengtharray.h"
49#include <private/qpdf_p.h>
50#include <qmath.h>
51#include <qendian.h>
52#include <private/qharfbuzz_p.h>
53
54QT_BEGIN_NAMESPACE
55
56static inline bool qtransform_equals_no_translate(const QTransform &a, const QTransform &b)
57{
58 if (a.type() <= QTransform::TxTranslate && b.type() <= QTransform::TxTranslate) {
59 return true;
60 } else {
61 // We always use paths for perspective text anyway, so no
62 // point in checking the full matrix...
63 Q_ASSERT(a.type() < QTransform::TxProject);
64 Q_ASSERT(b.type() < QTransform::TxProject);
65
66 return a.m11() == b.m11()
67 && a.m12() == b.m12()
68 && a.m21() == b.m21()
69 && a.m22() == b.m22();
70 }
71}
72
73// Harfbuzz helper functions
74
75static HB_Bool hb_stringToGlyphs(HB_Font font, const HB_UChar16 *string, hb_uint32 length, HB_Glyph *glyphs, hb_uint32 *numGlyphs, HB_Bool rightToLeft)
76{
77 QFontEngine *fe = (QFontEngine *)font->userData;
78
79 QVarLengthGlyphLayoutArray qglyphs(*numGlyphs);
80
81 QTextEngine::ShaperFlags shaperFlags(QTextEngine::GlyphIndicesOnly);
82 if (rightToLeft)
83 shaperFlags |= QTextEngine::RightToLeft;
84
85 int nGlyphs = *numGlyphs;
86 bool result = fe->stringToCMap(reinterpret_cast<const QChar *>(string), length, &qglyphs, &nGlyphs, shaperFlags);
87 *numGlyphs = nGlyphs;
88 if (!result)
89 return false;
90
91 for (hb_uint32 i = 0; i < *numGlyphs; ++i)
92 glyphs[i] = qglyphs.glyphs[i];
93
94 return true;
95}
96
97static void hb_getAdvances(HB_Font font, const HB_Glyph *glyphs, hb_uint32 numGlyphs, HB_Fixed *advances, int flags)
98{
99 QFontEngine *fe = (QFontEngine *)font->userData;
100
101 QVarLengthGlyphLayoutArray qglyphs(numGlyphs);
102
103 for (hb_uint32 i = 0; i < numGlyphs; ++i)
104 qglyphs.glyphs[i] = glyphs[i];
105
106 fe->recalcAdvances(&qglyphs, flags & HB_ShaperFlag_UseDesignMetrics ? QFlags<QTextEngine::ShaperFlag>(QTextEngine::DesignMetrics) : QFlags<QTextEngine::ShaperFlag>(0));
107
108 for (hb_uint32 i = 0; i < numGlyphs; ++i)
109 advances[i] = qglyphs.advances_x[i].value();
110}
111
112static HB_Bool hb_canRender(HB_Font font, const HB_UChar16 *string, hb_uint32 length)
113{
114 QFontEngine *fe = (QFontEngine *)font->userData;
115 return fe->canRender(reinterpret_cast<const QChar *>(string), length);
116}
117
118static void hb_getGlyphMetrics(HB_Font font, HB_Glyph glyph, HB_GlyphMetrics *metrics)
119{
120 QFontEngine *fe = (QFontEngine *)font->userData;
121 glyph_metrics_t m = fe->boundingBox(glyph);
122 metrics->x = m.x.value();
123 metrics->y = m.y.value();
124 metrics->width = m.width.value();
125 metrics->height = m.height.value();
126 metrics->xOffset = m.xoff.value();
127 metrics->yOffset = m.yoff.value();
128}
129
130static HB_Fixed hb_getFontMetric(HB_Font font, HB_FontMetric metric)
131{
132 if (metric == HB_FontAscent) {
133 QFontEngine *fe = (QFontEngine *)font->userData;
134 return fe->ascent().value();
135 }
136 return 0;
137}
138
139HB_Error QFontEngine::getPointInOutline(HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints)
140{
141 Q_UNUSED(glyph)
142 Q_UNUSED(flags)
143 Q_UNUSED(point)
144 Q_UNUSED(xpos)
145 Q_UNUSED(ypos)
146 Q_UNUSED(nPoints)
147 return HB_Err_Not_Covered;
148}
149
150static HB_Error hb_getPointInOutline(HB_Font font, HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints)
151{
152 QFontEngine *fe = (QFontEngine *)font->userData;
153 return fe->getPointInOutline(glyph, flags, point, xpos, ypos, nPoints);
154}
155
156static const HB_FontClass hb_fontClass = {
157 hb_stringToGlyphs, hb_getAdvances, hb_canRender, hb_getPointInOutline,
158 hb_getGlyphMetrics, hb_getFontMetric
159};
160
161static HB_Error hb_getSFntTable(void *font, HB_Tag tableTag, HB_Byte *buffer, HB_UInt *length)
162{
163 QFontEngine *fe = (QFontEngine *)font;
164 if (!fe->getSfntTableData(tableTag, buffer, length))
165 return HB_Err_Invalid_Argument;
166 return HB_Err_Ok;
167}
168
169// QFontEngine
170
171QFontEngine::QFontEngine()
172 : QObject()
173{
174 ref = 0;
175 cache_count = 0;
176 fsType = 0;
177 symbol = false;
178 memset(&hbFont, 0, sizeof(hbFont));
179 hbFont.klass = &hb_fontClass;
180 hbFont.userData = this;
181
182 hbFace = 0;
183 glyphFormat = -1;
184}
185
186QFontEngine::~QFontEngine()
187{
188 for (QLinkedList<GlyphCacheEntry>::const_iterator it = m_glyphCaches.constBegin(),
189 end = m_glyphCaches.constEnd(); it != end; ++it) {
190 delete it->cache;
191 }
192 m_glyphCaches.clear();
193 qHBFreeFace(hbFace);
194}
195
196QFixed QFontEngine::lineThickness() const
197{
198 // ad hoc algorithm
199 int score = fontDef.weight * fontDef.pixelSize;
200 int lw = score / 700;
201
202 // looks better with thicker line for small pointsizes
203 if (lw < 2 && score >= 1050) lw = 2;
204 if (lw == 0) lw = 1;
205
206 return lw;
207}
208
209QFixed QFontEngine::underlinePosition() const
210{
211 return ((lineThickness() * 2) + 3) / 6;
212}
213
214HB_Font QFontEngine::harfbuzzFont() const
215{
216 if (!hbFont.x_ppem) {
217 QFixed emSquare = emSquareSize();
218 hbFont.x_ppem = fontDef.pixelSize;
219 hbFont.y_ppem = fontDef.pixelSize * fontDef.stretch / 100;
220 hbFont.x_scale = (QFixed(hbFont.x_ppem * (1 << 16)) / emSquare).value();
221 hbFont.y_scale = (QFixed(hbFont.y_ppem * (1 << 16)) / emSquare).value();
222 }
223 return &hbFont;
224}
225
226HB_Face QFontEngine::harfbuzzFace() const
227{
228 if (!hbFace) {
229 hbFace = qHBNewFace(const_cast<QFontEngine *>(this), hb_getSFntTable);
230 Q_CHECK_PTR(hbFace);
231 }
232 return hbFace;
233}
234
235glyph_metrics_t QFontEngine::boundingBox(glyph_t glyph, const QTransform &matrix)
236{
237 glyph_metrics_t metrics = boundingBox(glyph);
238
239 if (matrix.type() > QTransform::TxTranslate) {
240 return metrics.transformed(matrix);
241 }
242 return metrics;
243}
244
245QFixed QFontEngine::xHeight() const
246{
247 QGlyphLayoutArray<8> glyphs;
248 int nglyphs = 7;
249 QChar x((ushort)'x');
250 stringToCMap(&x, 1, &glyphs, &nglyphs, QTextEngine::GlyphIndicesOnly);
251
252 glyph_metrics_t bb = const_cast<QFontEngine *>(this)->boundingBox(glyphs.glyphs[0]);
253 return bb.height;
254}
255
256QFixed QFontEngine::averageCharWidth() const
257{
258 QGlyphLayoutArray<8> glyphs;
259 int nglyphs = 7;
260 QChar x((ushort)'x');
261 stringToCMap(&x, 1, &glyphs, &nglyphs, QTextEngine::GlyphIndicesOnly);
262
263 glyph_metrics_t bb = const_cast<QFontEngine *>(this)->boundingBox(glyphs.glyphs[0]);
264 return bb.xoff;
265}
266
267
268void QFontEngine::getGlyphPositions(const QGlyphLayout &glyphs, const QTransform &matrix, QTextItem::RenderFlags flags,
269 QVarLengthArray<glyph_t> &glyphs_out, QVarLengthArray<QFixedPoint> &positions)
270{
271 QFixed xpos;
272 QFixed ypos;
273
274 const bool transform = matrix.m11() != 1.
275 || matrix.m12() != 0.
276 || matrix.m21() != 0.
277 || matrix.m22() != 1.;
278 if (!transform) {
279 xpos = QFixed::fromReal(matrix.dx());
280 ypos = QFixed::fromReal(matrix.dy());
281 }
282
283 int current = 0;
284 if (flags & QTextItem::RightToLeft) {
285 int i = glyphs.numGlyphs;
286 int totalKashidas = 0;
287 while(i--) {
288 xpos += glyphs.advances_x[i] + QFixed::fromFixed(glyphs.justifications[i].space_18d6);
289 ypos += glyphs.advances_y[i];
290 totalKashidas += glyphs.justifications[i].nKashidas;
291 }
292 positions.resize(glyphs.numGlyphs+totalKashidas);
293 glyphs_out.resize(glyphs.numGlyphs+totalKashidas);
294
295 i = 0;
296 while(i < glyphs.numGlyphs) {
297 if (glyphs.attributes[i].dontPrint) {
298 ++i;
299 continue;
300 }
301 xpos -= glyphs.advances_x[i];
302 ypos -= glyphs.advances_y[i];
303
304 QFixed gpos_x = xpos + glyphs.offsets[i].x;
305 QFixed gpos_y = ypos + glyphs.offsets[i].y;
306 if (transform) {
307 QPointF gpos(gpos_x.toReal(), gpos_y.toReal());
308 gpos = gpos * matrix;
309 gpos_x = QFixed::fromReal(gpos.x());
310 gpos_y = QFixed::fromReal(gpos.y());
311 }
312 positions[current].x = gpos_x;
313 positions[current].y = gpos_y;
314 glyphs_out[current] = glyphs.glyphs[i];
315 ++current;
316 if (glyphs.justifications[i].nKashidas) {
317 QChar ch(0x640); // Kashida character
318 QGlyphLayoutArray<8> g;
319 int nglyphs = 7;
320 stringToCMap(&ch, 1, &g, &nglyphs, 0);
321 for (uint k = 0; k < glyphs.justifications[i].nKashidas; ++k) {
322 xpos -= g.advances_x[0];
323 ypos -= g.advances_y[0];
324
325 QFixed gpos_x = xpos + glyphs.offsets[i].x;
326 QFixed gpos_y = ypos + glyphs.offsets[i].y;
327 if (transform) {
328 QPointF gpos(gpos_x.toReal(), gpos_y.toReal());
329 gpos = gpos * matrix;
330 gpos_x = QFixed::fromReal(gpos.x());
331 gpos_y = QFixed::fromReal(gpos.y());
332 }
333 positions[current].x = gpos_x;
334 positions[current].y = gpos_y;
335 glyphs_out[current] = g.glyphs[0];
336 ++current;
337 }
338 } else {
339 xpos -= QFixed::fromFixed(glyphs.justifications[i].space_18d6);
340 }
341 ++i;
342 }
343 } else {
344 positions.resize(glyphs.numGlyphs);
345 glyphs_out.resize(glyphs.numGlyphs);
346 int i = 0;
347 if (!transform) {
348 while (i < glyphs.numGlyphs) {
349 if (!glyphs.attributes[i].dontPrint) {
350 positions[current].x = xpos + glyphs.offsets[i].x;
351 positions[current].y = ypos + glyphs.offsets[i].y;
352 glyphs_out[current] = glyphs.glyphs[i];
353 xpos += glyphs.advances_x[i] + QFixed::fromFixed(glyphs.justifications[i].space_18d6);
354 ypos += glyphs.advances_y[i];
355 ++current;
356 }
357 ++i;
358 }
359 } else {
360 while (i < glyphs.numGlyphs) {
361 if (!glyphs.attributes[i].dontPrint) {
362 QFixed gpos_x = xpos + glyphs.offsets[i].x;
363 QFixed gpos_y = ypos + glyphs.offsets[i].y;
364 QPointF gpos(gpos_x.toReal(), gpos_y.toReal());
365 gpos = gpos * matrix;
366 positions[current].x = QFixed::fromReal(gpos.x());
367 positions[current].y = QFixed::fromReal(gpos.y());
368 glyphs_out[current] = glyphs.glyphs[i];
369 xpos += glyphs.advances_x[i] + QFixed::fromFixed(glyphs.justifications[i].space_18d6);
370 ypos += glyphs.advances_y[i];
371 ++current;
372 }
373 ++i;
374 }
375 }
376 }
377 positions.resize(current);
378 glyphs_out.resize(current);
379 Q_ASSERT(positions.size() == glyphs_out.size());
380}
381
382void QFontEngine::getGlyphBearings(glyph_t glyph, qreal *leftBearing, qreal *rightBearing)
383{
384 glyph_metrics_t gi = boundingBox(glyph);
385 bool isValid = gi.isValid();
386 if (leftBearing != 0)
387 *leftBearing = isValid ? gi.x.toReal() : 0.0;
388 if (rightBearing != 0)
389 *rightBearing = isValid ? (gi.xoff - gi.x - gi.width).toReal() : 0.0;
390}
391
392glyph_metrics_t QFontEngine::tightBoundingBox(const QGlyphLayout &glyphs)
393{
394 glyph_metrics_t overall;
395
396 QFixed ymax = 0;
397 QFixed xmax = 0;
398 for (int i = 0; i < glyphs.numGlyphs; i++) {
399 glyph_metrics_t bb = boundingBox(glyphs.glyphs[i]);
400 QFixed x = overall.xoff + glyphs.offsets[i].x + bb.x;
401 QFixed y = overall.yoff + glyphs.offsets[i].y + bb.y;
402 overall.x = qMin(overall.x, x);
403 overall.y = qMin(overall.y, y);
404 xmax = qMax(xmax, x + bb.width);
405 ymax = qMax(ymax, y + bb.height);
406 overall.xoff += bb.xoff;
407 overall.yoff += bb.yoff;
408 }
409 overall.height = qMax(overall.height, ymax - overall.y);
410 overall.width = xmax - overall.x;
411
412 return overall;
413}
414
415
416void QFontEngine::addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, QPainterPath *path,
417 QTextItem::RenderFlags flags)
418{
419 if (!glyphs.numGlyphs)
420 return;
421
422 QVarLengthArray<QFixedPoint> positions;
423 QVarLengthArray<glyph_t> positioned_glyphs;
424 QTransform matrix = QTransform::fromTranslate(x, y);
425 getGlyphPositions(glyphs, matrix, flags, positioned_glyphs, positions);
426 addGlyphsToPath(positioned_glyphs.data(), positions.data(), positioned_glyphs.size(), path, flags);
427}
428
429#define GRID(x, y) grid[(y)*(w+1) + (x)]
430#define SET(x, y) (*(image_data + (y)*bpl + ((x) >> 3)) & (0x80 >> ((x) & 7)))
431
432enum { EdgeRight = 0x1,
433 EdgeDown = 0x2,
434 EdgeLeft = 0x4,
435 EdgeUp = 0x8
436};
437
438static void collectSingleContour(qreal x0, qreal y0, uint *grid, int x, int y, int w, int h, QPainterPath *path)
439{
440 Q_UNUSED(h);
441
442 path->moveTo(x + x0, y + y0);
443 while (GRID(x, y)) {
444 if (GRID(x, y) & EdgeRight) {
445 while (GRID(x, y) & EdgeRight) {
446 GRID(x, y) &= ~EdgeRight;
447 ++x;
448 }
449 Q_ASSERT(x <= w);
450 path->lineTo(x + x0, y + y0);
451 continue;
452 }
453 if (GRID(x, y) & EdgeDown) {
454 while (GRID(x, y) & EdgeDown) {
455 GRID(x, y) &= ~EdgeDown;
456 ++y;
457 }
458 Q_ASSERT(y <= h);
459 path->lineTo(x + x0, y + y0);
460 continue;
461 }
462 if (GRID(x, y) & EdgeLeft) {
463 while (GRID(x, y) & EdgeLeft) {
464 GRID(x, y) &= ~EdgeLeft;
465 --x;
466 }
467 Q_ASSERT(x >= 0);
468 path->lineTo(x + x0, y + y0);
469 continue;
470 }
471 if (GRID(x, y) & EdgeUp) {
472 while (GRID(x, y) & EdgeUp) {
473 GRID(x, y) &= ~EdgeUp;
474 --y;
475 }
476 Q_ASSERT(y >= 0);
477 path->lineTo(x + x0, y + y0);
478 continue;
479 }
480 }
481 path->closeSubpath();
482}
483
484void qt_addBitmapToPath(qreal x0, qreal y0, const uchar *image_data, int bpl, int w, int h, QPainterPath *path)
485{
486 uint *grid = new uint[(w+1)*(h+1)];
487 // set up edges
488 for (int y = 0; y <= h; ++y) {
489 for (int x = 0; x <= w; ++x) {
490 bool topLeft = (x == 0)|(y == 0) ? false : SET(x - 1, y - 1);
491 bool topRight = (x == w)|(y == 0) ? false : SET(x, y - 1);
492 bool bottomLeft = (x == 0)|(y == h) ? false : SET(x - 1, y);
493 bool bottomRight = (x == w)|(y == h) ? false : SET(x, y);
494
495 GRID(x, y) = 0;
496 if ((!topRight) & bottomRight)
497 GRID(x, y) |= EdgeRight;
498 if ((!bottomRight) & bottomLeft)
499 GRID(x, y) |= EdgeDown;
500 if ((!bottomLeft) & topLeft)
501 GRID(x, y) |= EdgeLeft;
502 if ((!topLeft) & topRight)
503 GRID(x, y) |= EdgeUp;
504 }
505 }
506
507 // collect edges
508 for (int y = 0; y < h; ++y) {
509 for (int x = 0; x < w; ++x) {
510 if (!GRID(x, y))
511 continue;
512 // found start of a contour, follow it
513 collectSingleContour(x0, y0, grid, x, y, w, h, path);
514 }
515 }
516 delete [] grid;
517}
518
519#undef GRID
520#undef SET
521
522
523void QFontEngine::addBitmapFontToPath(qreal x, qreal y, const QGlyphLayout &glyphs,
524 QPainterPath *path, QTextItem::RenderFlags flags)
525{
526// TODO what to do with 'flags' ??
527 Q_UNUSED(flags);
528 QFixed advanceX = QFixed::fromReal(x);
529 QFixed advanceY = QFixed::fromReal(y);
530 for (int i=0; i < glyphs.numGlyphs; ++i) {
531 glyph_metrics_t metrics = boundingBox(glyphs.glyphs[i]);
532 if (metrics.width.value() == 0 || metrics.height.value() == 0) {
533 advanceX += glyphs.advances_x[i];
534 advanceY += glyphs.advances_y[i];
535 continue;
536 }
537 const QImage alphaMask = alphaMapForGlyph(glyphs.glyphs[i]);
538
539 const int w = alphaMask.width();
540 const int h = alphaMask.height();
541 const int srcBpl = alphaMask.bytesPerLine();
542 QImage bitmap;
543 if (alphaMask.depth() == 1) {
544 bitmap = alphaMask;
545 } else {
546 bitmap = QImage(w, h, QImage::Format_Mono);
547 const uchar *imageData = alphaMask.bits();
548 const int destBpl = bitmap.bytesPerLine();
549 uchar *bitmapData = bitmap.bits();
550
551 for (int yi = 0; yi < h; ++yi) {
552 const uchar *src = imageData + yi*srcBpl;
553 uchar *dst = bitmapData + yi*destBpl;
554 for (int xi = 0; xi < w; ++xi) {
555 const int byte = xi / 8;
556 const int bit = xi % 8;
557 if (bit == 0)
558 dst[byte] = 0;
559 if (src[xi])
560 dst[byte] |= 128 >> bit;
561 }
562 }
563 }
564 const uchar *bitmap_data = bitmap.bits();
565 QFixedPoint offset = glyphs.offsets[i];
566 advanceX += offset.x;
567 advanceY += offset.y;
568 qt_addBitmapToPath((advanceX + metrics.x).toReal(), (advanceY + metrics.y).toReal(), bitmap_data, bitmap.bytesPerLine(), w, h, path);
569 advanceX += glyphs.advances_x[i];
570 advanceY += glyphs.advances_y[i];
571 }
572}
573
574void QFontEngine::addGlyphsToPath(glyph_t *glyphs, QFixedPoint *positions, int nGlyphs,
575 QPainterPath *path, QTextItem::RenderFlags flags)
576{
577 qreal x = positions[0].x.toReal();
578 qreal y = positions[0].y.toReal();
579 QVarLengthGlyphLayoutArray g(nGlyphs);
580
581 for (int i = 0; i < nGlyphs; ++i) {
582 g.glyphs[i] = glyphs[i];
583 if (i < nGlyphs - 1) {
584 g.advances_x[i] = positions[i+1].x - positions[i].x;
585 g.advances_y[i] = positions[i+1].y - positions[i].y;
586 } else {
587 g.advances_x[i] = QFixed::fromReal(maxCharWidth());
588 g.advances_y[i] = 0;
589 }
590 }
591
592 addBitmapFontToPath(x, y, g, path, flags);
593}
594
595QImage QFontEngine::alphaMapForGlyph(glyph_t glyph, const QTransform &t)
596{
597 QImage i = alphaMapForGlyph(glyph);
598 if (t.type() > QTransform::TxTranslate)
599 i = i.transformed(t);
600 Q_ASSERT(i.depth() <= 8); // To verify that transformed didn't change the format...
601 return i;
602}
603
604QImage QFontEngine::alphaRGBMapForGlyph(glyph_t glyph, int /* margin */, const QTransform &t)
605{
606 QImage alphaMask = alphaMapForGlyph(glyph, t);
607 QImage rgbMask(alphaMask.width(), alphaMask.height(), QImage::Format_RGB32);
608
609 for (int y=0; y<alphaMask.height(); ++y) {
610 uint *dst = (uint *) rgbMask.scanLine(y);
611 uchar *src = (uchar *) alphaMask.scanLine(y);
612 for (int x=0; x<alphaMask.width(); ++x)
613 dst[x] = qRgb(src[x], src[x], src[x]);
614 }
615
616 return rgbMask;
617}
618
619QImage QFontEngine::alphaMapForGlyph(glyph_t glyph)
620{
621 glyph_metrics_t gm = boundingBox(glyph);
622 int glyph_x = qFloor(gm.x.toReal());
623 int glyph_y = qFloor(gm.y.toReal());
624 int glyph_width = qCeil((gm.x + gm.width).toReal()) - glyph_x;
625 int glyph_height = qCeil((gm.y + gm.height).toReal()) - glyph_y;
626
627 if (glyph_width <= 0 || glyph_height <= 0)
628 return QImage();
629 QFixedPoint pt;
630 pt.x = 0;
631 pt.y = -glyph_y; // the baseline
632 QPainterPath path;
633 QImage im(glyph_width + qAbs(glyph_x) + 4, glyph_height, QImage::Format_ARGB32_Premultiplied);
634 im.fill(Qt::transparent);
635 QPainter p(&im);
636 p.setRenderHint(QPainter::Antialiasing);
637 addGlyphsToPath(&glyph, &pt, 1, &path, 0);
638 p.setPen(Qt::NoPen);
639 p.setBrush(Qt::black);
640 p.drawPath(path);
641 p.end();
642
643 QImage indexed(im.width(), im.height(), QImage::Format_Indexed8);
644 QVector<QRgb> colors(256);
645 for (int i=0; i<256; ++i)
646 colors[i] = qRgba(0, 0, 0, i);
647 indexed.setColorTable(colors);
648
649 for (int y=0; y<im.height(); ++y) {
650 uchar *dst = (uchar *) indexed.scanLine(y);
651 uint *src = (uint *) im.scanLine(y);
652 for (int x=0; x<im.width(); ++x)
653 dst[x] = qAlpha(src[x]);
654 }
655
656 return indexed;
657}
658
659void QFontEngine::removeGlyphFromCache(glyph_t)
660{
661}
662
663QFontEngine::Properties QFontEngine::properties() const
664{
665 Properties p;
666#ifndef QT_NO_PRINTER
667 QByteArray psname = QPdf::stripSpecialCharacters(fontDef.family.toUtf8());
668#else
669 QByteArray psname = fontDef.family.toUtf8();
670#endif
671 psname += '-';
672 psname += QByteArray::number(fontDef.style);
673 psname += '-';
674 psname += QByteArray::number(fontDef.weight);
675
676 p.postscriptName = psname;
677 p.ascent = ascent();
678 p.descent = descent();
679 p.leading = leading();
680 p.emSquare = p.ascent;
681 p.boundingBox = QRectF(0, -p.ascent.toReal(), maxCharWidth(), (p.ascent + p.descent).toReal());
682 p.italicAngle = 0;
683 p.capHeight = p.ascent;
684 p.lineWidth = lineThickness();
685 return p;
686}
687
688void QFontEngine::getUnscaledGlyph(glyph_t glyph, QPainterPath *path, glyph_metrics_t *metrics)
689{
690 *metrics = boundingBox(glyph);
691 QFixedPoint p;
692 p.x = 0;
693 p.y = 0;
694 addGlyphsToPath(&glyph, &p, 1, path, QFlag(0));
695}
696
697QByteArray QFontEngine::getSfntTable(uint tag) const
698{
699 QByteArray table;
700 uint len = 0;
701 if (!getSfntTableData(tag, 0, &len))
702 return table;
703 if (!len)
704 return table;
705 table.resize(len);
706 if (!getSfntTableData(tag, reinterpret_cast<uchar *>(table.data()), &len))
707 return QByteArray();
708 return table;
709}
710
711void QFontEngine::setGlyphCache(void *key, QFontEngineGlyphCache *data)
712{
713 Q_ASSERT(data);
714
715 GlyphCacheEntry entry = { key, data };
716 if (m_glyphCaches.contains(entry))
717 return;
718
719 // Limit the glyph caches to 4. This covers all 90 degree rotations and limits
720 // memory use when there is continous or random rotation
721 if (m_glyphCaches.size() == 4)
722 delete m_glyphCaches.takeLast().cache;
723
724 m_glyphCaches.push_front(entry);
725
726}
727
728QFontEngineGlyphCache *QFontEngine::glyphCache(void *key, QFontEngineGlyphCache::Type type, const QTransform &transform) const
729{
730 for (QLinkedList<GlyphCacheEntry>::const_iterator it = m_glyphCaches.constBegin(), end = m_glyphCaches.constEnd(); it != end; ++it) {
731 QFontEngineGlyphCache *c = it->cache;
732 if (key == it->context
733 && type == c->cacheType()
734 && qtransform_equals_no_translate(c->m_transform, transform)) {
735 return c;
736 }
737 }
738 return 0;
739}
740
741#if defined(Q_WS_WIN) || defined(Q_WS_X11) || defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN) || defined(Q_WS_PM) || defined(Q_WS_PM)
742static inline QFixed kerning(int left, int right, const QFontEngine::KernPair *pairs, int numPairs)
743{
744 uint left_right = (left << 16) + right;
745
746 left = 0, right = numPairs - 1;
747 while (left <= right) {
748 int middle = left + ( ( right - left ) >> 1 );
749
750 if(pairs[middle].left_right == left_right)
751 return pairs[middle].adjust;
752
753 if (pairs[middle].left_right < left_right)
754 left = middle + 1;
755 else
756 right = middle - 1;
757 }
758 return 0;
759}
760
761void QFontEngine::doKerning(QGlyphLayout *glyphs, QTextEngine::ShaperFlags flags) const
762{
763 int numPairs = kerning_pairs.size();
764 if(!numPairs)
765 return;
766
767 const KernPair *pairs = kerning_pairs.constData();
768
769 if(flags & QTextEngine::DesignMetrics) {
770 for(int i = 0; i < glyphs->numGlyphs - 1; ++i)
771 glyphs->advances_x[i] += kerning(glyphs->glyphs[i], glyphs->glyphs[i+1] , pairs, numPairs);
772 } else {
773 for(int i = 0; i < glyphs->numGlyphs - 1; ++i)
774 glyphs->advances_x[i] += qRound(kerning(glyphs->glyphs[i], glyphs->glyphs[i+1] , pairs, numPairs));
775 }
776}
777
778void QFontEngine::loadKerningPairs(QFixed scalingFactor)
779{
780 kerning_pairs.clear();
781
782 QByteArray tab = getSfntTable(MAKE_TAG('k', 'e', 'r', 'n'));
783 if (tab.isEmpty())
784 return;
785
786 const uchar *table = reinterpret_cast<const uchar *>(tab.constData());
787
788 unsigned short version = qFromBigEndian<quint16>(table);
789 if (version != 0) {
790// qDebug("wrong version");
791 return;
792 }
793
794 unsigned short numTables = qFromBigEndian<quint16>(table + 2);
795 {
796 int offset = 4;
797 for(int i = 0; i < numTables; ++i) {
798 if (offset + 6 > tab.size()) {
799// qDebug("offset out of bounds");
800 goto end;
801 }
802 const uchar *header = table + offset;
803
804 ushort version = qFromBigEndian<quint16>(header);
805 ushort length = qFromBigEndian<quint16>(header+2);
806 ushort coverage = qFromBigEndian<quint16>(header+4);
807// qDebug("subtable: version=%d, coverage=%x",version, coverage);
808 if(version == 0 && coverage == 0x0001) {
809 if (offset + length > tab.size()) {
810// qDebug("length ouf ot bounds");
811 goto end;
812 }
813 const uchar *data = table + offset + 6;
814
815 ushort nPairs = qFromBigEndian<quint16>(data);
816 if(nPairs * 6 + 8 > length - 6) {
817// qDebug("corrupt table!");
818 // corrupt table
819 goto end;
820 }
821
822 int off = 8;
823 for(int i = 0; i < nPairs; ++i) {
824 QFontEngine::KernPair p;
825 p.left_right = (((uint)qFromBigEndian<quint16>(data+off)) << 16) + qFromBigEndian<quint16>(data+off+2);
826 p.adjust = QFixed(((int)(short)qFromBigEndian<quint16>(data+off+4))) / scalingFactor;
827 kerning_pairs.append(p);
828 off += 6;
829 }
830 }
831 offset += length;
832 }
833 }
834end:
835 qSort(kerning_pairs);
836// for (int i = 0; i < kerning_pairs.count(); ++i)
837// qDebug() << 'i' << i << "left_right" << hex << kerning_pairs.at(i).left_right;
838}
839
840#else
841void QFontEngine::doKerning(QGlyphLayout *, QTextEngine::ShaperFlags) const
842{
843}
844#endif
845
846int QFontEngine::glyphCount() const
847{
848 QByteArray maxpTable = getSfntTable(MAKE_TAG('m', 'a', 'x', 'p'));
849 if (maxpTable.size() < 6)
850 return 0;
851 return qFromBigEndian<quint16>(reinterpret_cast<const uchar *>(maxpTable.constData() + 4));
852}
853
854const uchar *QFontEngine::getCMap(const uchar *table, uint tableSize, bool *isSymbolFont, int *cmapSize)
855{
856 const uchar *header = table;
857 if (tableSize < 4)
858 return 0;
859
860 const uchar *endPtr = table + tableSize;
861
862 // version check
863 if (qFromBigEndian<quint16>(header) != 0)
864 return 0;
865
866 unsigned short numTables = qFromBigEndian<quint16>(header + 2);
867 const uchar *maps = table + 4;
868 if (maps + 8 * numTables > endPtr)
869 return 0;
870
871 enum {
872 Invalid,
873 Symbol,
874 AppleRoman,
875 Unicode11,
876 Unicode,
877 MicrosoftUnicode,
878 MicrosoftUnicodeExtended
879 };
880
881 int symbolTable = -1;
882 int tableToUse = -1;
883 int score = Invalid;
884 for (int n = 0; n < numTables; ++n) {
885 const quint16 platformId = qFromBigEndian<quint16>(maps + 8 * n);
886 const quint16 platformSpecificId = qFromBigEndian<quint16>(maps + 8 * n + 2);
887 switch (platformId) {
888 case 0: // Unicode
889 if (score < Unicode &&
890 (platformSpecificId == 0 ||
891 platformSpecificId == 2 ||
892 platformSpecificId == 3)) {
893 tableToUse = n;
894 score = Unicode;
895 } else if (score < Unicode11 && platformSpecificId == 1) {
896 tableToUse = n;
897 score = Unicode11;
898 }
899 break;
900 case 1: // Apple
901 if (score < AppleRoman && platformSpecificId == 0) { // Apple Roman
902 tableToUse = n;
903 score = AppleRoman;
904 }
905 break;
906 case 3: // Microsoft
907 switch (platformSpecificId) {
908 case 0:
909 symbolTable = n;
910 if (score < Symbol) {
911 tableToUse = n;
912 score = Symbol;
913 }
914 break;
915 case 1:
916 if (score < MicrosoftUnicode) {
917 tableToUse = n;
918 score = MicrosoftUnicode;
919 }
920 break;
921 case 0xa:
922 if (score < MicrosoftUnicodeExtended) {
923 tableToUse = n;
924 score = MicrosoftUnicodeExtended;
925 }
926 break;
927 default:
928 break;
929 }
930 default:
931 break;
932 }
933 }
934 if(tableToUse < 0)
935 return 0;
936
937resolveTable:
938 *isSymbolFont = (score == Symbol);
939
940 unsigned int unicode_table = qFromBigEndian<quint32>(maps + 8*tableToUse + 4);
941
942 if (!unicode_table || unicode_table + 8 > tableSize)
943 return 0;
944
945 // get the header of the unicode table
946 header = table + unicode_table;
947
948 unsigned short format = qFromBigEndian<quint16>(header);
949 unsigned int length;
950 if(format < 8)
951 length = qFromBigEndian<quint16>(header + 2);
952 else
953 length = qFromBigEndian<quint32>(header + 4);
954
955 if (table + unicode_table + length > endPtr)
956 return 0;
957 *cmapSize = length;
958
959 // To support symbol fonts that contain a unicode table for the symbol area
960 // we check the cmap tables and fall back to symbol font unless that would
961 // involve losing information from the unicode table
962 if (symbolTable > -1 && ((score == Unicode) || (score == Unicode11))) {
963 const uchar *selectedTable = table + unicode_table;
964
965 // Check that none of the latin1 range are in the unicode table
966 bool unicodeTableHasLatin1 = false;
967 for (int uc=0x00; uc<0x100; ++uc) {
968 if (getTrueTypeGlyphIndex(selectedTable, uc) != 0) {
969 unicodeTableHasLatin1 = true;
970 break;
971 }
972 }
973
974 // Check that at least one symbol char is in the unicode table
975 bool unicodeTableHasSymbols = false;
976 if (!unicodeTableHasLatin1) {
977 for (int uc=0xf000; uc<0xf100; ++uc) {
978 if (getTrueTypeGlyphIndex(selectedTable, uc) != 0) {
979 unicodeTableHasSymbols = true;
980 break;
981 }
982 }
983 }
984
985 // Fall back to symbol table
986 if (!unicodeTableHasLatin1 && unicodeTableHasSymbols) {
987 tableToUse = symbolTable;
988 score = Symbol;
989 goto resolveTable;
990 }
991 }
992
993 return table + unicode_table;
994}
995
996quint32 QFontEngine::getTrueTypeGlyphIndex(const uchar *cmap, uint unicode)
997{
998 unsigned short format = qFromBigEndian<quint16>(cmap);
999 if (format == 0) {
1000 if (unicode < 256)
1001 return (int) *(cmap+6+unicode);
1002 } else if (format == 4) {
1003 /* some fonts come with invalid cmap tables, where the last segment
1004 specified end = start = rangeoffset = 0xffff, delta = 0x0001
1005 Since 0xffff is never a valid Unicode char anyway, we just get rid of the issue
1006 by returning 0 for 0xffff
1007 */
1008 if(unicode >= 0xffff)
1009 return 0;
1010 quint16 segCountX2 = qFromBigEndian<quint16>(cmap + 6);
1011 const unsigned char *ends = cmap + 14;
1012 int i = 0;
1013 for (; i < segCountX2/2 && qFromBigEndian<quint16>(ends + 2*i) < unicode; i++) {}
1014
1015 const unsigned char *idx = ends + segCountX2 + 2 + 2*i;
1016 quint16 startIndex = qFromBigEndian<quint16>(idx);
1017
1018 if (startIndex > unicode)
1019 return 0;
1020
1021 idx += segCountX2;
1022 qint16 idDelta = (qint16)qFromBigEndian<quint16>(idx);
1023 idx += segCountX2;
1024 quint16 idRangeoffset_t = (quint16)qFromBigEndian<quint16>(idx);
1025
1026 quint16 glyphIndex;
1027 if (idRangeoffset_t) {
1028 quint16 id = qFromBigEndian<quint16>(idRangeoffset_t + 2*(unicode - startIndex) + idx);
1029 if (id)
1030 glyphIndex = (idDelta + id) % 0x10000;
1031 else
1032 glyphIndex = 0;
1033 } else {
1034 glyphIndex = (idDelta + unicode) % 0x10000;
1035 }
1036 return glyphIndex;
1037 } else if (format == 6) {
1038 quint16 tableSize = qFromBigEndian<quint16>(cmap + 2);
1039
1040 quint16 firstCode6 = qFromBigEndian<quint16>(cmap + 6);
1041 if (unicode < firstCode6)
1042 return 0;
1043
1044 quint16 entryCount6 = qFromBigEndian<quint16>(cmap + 8);
1045 if (entryCount6 * 2 + 10 > tableSize)
1046 return 0;
1047
1048 quint16 sentinel6 = firstCode6 + entryCount6;
1049 if (unicode >= sentinel6)
1050 return 0;
1051
1052 quint16 entryIndex6 = unicode - firstCode6;
1053 return qFromBigEndian<quint16>(cmap + 10 + (entryIndex6 * 2));
1054 } else if (format == 12) {
1055 quint32 nGroups = qFromBigEndian<quint32>(cmap + 12);
1056
1057 cmap += 16; // move to start of groups
1058
1059 int left = 0, right = nGroups - 1;
1060 while (left <= right) {
1061 int middle = left + ( ( right - left ) >> 1 );
1062
1063 quint32 startCharCode = qFromBigEndian<quint32>(cmap + 12*middle);
1064 if(unicode < startCharCode)
1065 right = middle - 1;
1066 else {
1067 quint32 endCharCode = qFromBigEndian<quint32>(cmap + 12*middle + 4);
1068 if(unicode <= endCharCode)
1069 return qFromBigEndian<quint32>(cmap + 12*middle + 8) + unicode - startCharCode;
1070 left = middle + 1;
1071 }
1072 }
1073 } else {
1074 qDebug("cmap table of format %d not implemented", format);
1075 }
1076
1077 return 0;
1078}
1079
1080Q_GLOBAL_STATIC_WITH_INITIALIZER(QVector<QRgb>, qt_grayPalette, {
1081 x->resize(256);
1082 QRgb *it = x->data();
1083 for (int i = 0; i < x->size(); ++i, ++it)
1084 *it = 0xff000000 | i | (i<<8) | (i<<16);
1085})
1086
1087const QVector<QRgb> &QFontEngine::grayPalette()
1088{
1089 return *qt_grayPalette();
1090}
1091
1092// ------------------------------------------------------------------
1093// The box font engine
1094// ------------------------------------------------------------------
1095
1096QFontEngineBox::QFontEngineBox(int size)
1097 : _size(size)
1098{
1099 cache_cost = sizeof(QFontEngineBox);
1100}
1101
1102QFontEngineBox::~QFontEngineBox()
1103{
1104}
1105
1106bool QFontEngineBox::stringToCMap(const QChar *, int len, QGlyphLayout *glyphs, int *nglyphs, QTextEngine::ShaperFlags) const
1107{
1108 if (*nglyphs < len) {
1109 *nglyphs = len;
1110 return false;
1111 }
1112
1113 for (int i = 0; i < len; i++) {
1114 glyphs->glyphs[i] = 0;
1115 glyphs->advances_x[i] = _size;
1116 glyphs->advances_y[i] = 0;
1117 }
1118
1119 *nglyphs = len;
1120 glyphs->numGlyphs = len;
1121 return true;
1122}
1123
1124void QFontEngineBox::recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags) const
1125{
1126 for (int i = 0; i < glyphs->numGlyphs; i++) {
1127 glyphs->advances_x[i] = _size;
1128 glyphs->advances_y[i] = 0;
1129 }
1130}
1131
1132void QFontEngineBox::addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs, QPainterPath *path, QTextItem::RenderFlags flags)
1133{
1134 if (!glyphs.numGlyphs)
1135 return;
1136
1137 QVarLengthArray<QFixedPoint> positions;
1138 QVarLengthArray<glyph_t> positioned_glyphs;
1139 QTransform matrix = QTransform::fromTranslate(x, y - _size);
1140 getGlyphPositions(glyphs, matrix, flags, positioned_glyphs, positions);
1141
1142 QSize s(_size - 3, _size - 3);
1143 for (int k = 0; k < positions.size(); k++)
1144 path->addRect(QRectF(positions[k].toPointF(), s));
1145}
1146
1147glyph_metrics_t QFontEngineBox::boundingBox(const QGlyphLayout &glyphs)
1148{
1149 glyph_metrics_t overall;
1150 overall.width = _size*glyphs.numGlyphs;
1151 overall.height = _size;
1152 overall.xoff = overall.width;
1153 return overall;
1154}
1155
1156#if defined(Q_WS_QWS)
1157void QFontEngineBox::draw(QPaintEngine *p, qreal x, qreal y, const QTextItemInt &ti)
1158{
1159 if (!ti.glyphs.numGlyphs)
1160 return;
1161
1162 // any fixes here should probably also be done in QPaintEnginePrivate::drawBoxTextItem
1163 QSize s(_size - 3, _size - 3);
1164
1165 QVarLengthArray<QFixedPoint> positions;
1166 QVarLengthArray<glyph_t> glyphs;
1167 QTransform matrix = QTransform::fromTranslate(x, y - _size);
1168 ti.fontEngine->getGlyphPositions(ti.glyphs, matrix, ti.flags, glyphs, positions);
1169 if (glyphs.size() == 0)
1170 return;
1171
1172
1173 QPainter *painter = p->painter();
1174 painter->save();
1175 painter->setBrush(Qt::NoBrush);
1176 QPen pen = painter->pen();
1177 pen.setWidthF(lineThickness().toReal());
1178 painter->setPen(pen);
1179 for (int k = 0; k < positions.size(); k++)
1180 painter->drawRect(QRectF(positions[k].toPointF(), s));
1181 painter->restore();
1182}
1183#endif
1184
1185glyph_metrics_t QFontEngineBox::boundingBox(glyph_t)
1186{
1187 return glyph_metrics_t(0, -_size, _size, _size, _size, 0);
1188}
1189
1190
1191
1192QFixed QFontEngineBox::ascent() const
1193{
1194 return _size;
1195}
1196
1197QFixed QFontEngineBox::descent() const
1198{
1199 return 0;
1200}
1201
1202QFixed QFontEngineBox::leading() const
1203{
1204 QFixed l = _size * QFixed::fromReal(qreal(0.15));
1205 return l.ceil();
1206}
1207
1208qreal QFontEngineBox::maxCharWidth() const
1209{
1210 return _size;
1211}
1212
1213#ifdef Q_WS_X11
1214int QFontEngineBox::cmap() const
1215{
1216 return -1;
1217}
1218#endif
1219
1220const char *QFontEngineBox::name() const
1221{
1222 return "null";
1223}
1224
1225bool QFontEngineBox::canRender(const QChar *, int)
1226{
1227 return true;
1228}
1229
1230QFontEngine::Type QFontEngineBox::type() const
1231{
1232 return Box;
1233}
1234
1235QImage QFontEngineBox::alphaMapForGlyph(glyph_t)
1236{
1237 QImage image(_size, _size, QImage::Format_Indexed8);
1238 QVector<QRgb> colors(256);
1239 for (int i=0; i<256; ++i)
1240 colors[i] = qRgba(0, 0, 0, i);
1241 image.setColorTable(colors);
1242 image.fill(0);
1243
1244 // can't use qpainter for index8; so use setPixel to draw our rectangle.
1245 for (int i=2; i <= _size-3; ++i) {
1246 image.setPixel(i, 2, 255);
1247 image.setPixel(i, _size-3, 255);
1248 image.setPixel(2, i, 255);
1249 image.setPixel(_size-3, i, 255);
1250 }
1251 return image;
1252}
1253
1254// ------------------------------------------------------------------
1255// Multi engine
1256// ------------------------------------------------------------------
1257
1258static inline uchar highByte(glyph_t glyph)
1259{ return glyph >> 24; }
1260
1261// strip high byte from glyph
1262static inline glyph_t stripped(glyph_t glyph)
1263{ return glyph & 0x00ffffff; }
1264
1265QFontEngineMulti::QFontEngineMulti(int engineCount)
1266{
1267 engines.fill(0, engineCount);
1268 cache_cost = 0;
1269}
1270
1271QFontEngineMulti::~QFontEngineMulti()
1272{
1273 for (int i = 0; i < engines.size(); ++i) {
1274 QFontEngine *fontEngine = engines.at(i);
1275 if (fontEngine) {
1276 fontEngine->ref.deref();
1277 if (fontEngine->cache_count == 0 && fontEngine->ref == 0)
1278 delete fontEngine;
1279 }
1280 }
1281}
1282
1283bool QFontEngineMulti::stringToCMap(const QChar *str, int len,
1284 QGlyphLayout *glyphs, int *nglyphs,
1285 QTextEngine::ShaperFlags flags) const
1286{
1287 int ng = *nglyphs;
1288 if (!engine(0)->stringToCMap(str, len, glyphs, &ng, flags))
1289 return false;
1290
1291 int glyph_pos = 0;
1292 for (int i = 0; i < len; ++i) {
1293 bool surrogate = (str[i].unicode() >= 0xd800 && str[i].unicode() < 0xdc00 && i < len-1
1294 && str[i+1].unicode() >= 0xdc00 && str[i+1].unicode() < 0xe000);
1295
1296 if (glyphs->glyphs[glyph_pos] == 0 && str[i].category() != QChar::Separator_Line) {
1297 QGlyphLayoutInstance tmp = glyphs->instance(glyph_pos);
1298 for (int x = 1; x < engines.size(); ++x) {
1299 QFontEngine *engine = engines.at(x);
1300 if (!engine) {
1301 const_cast<QFontEngineMulti *>(this)->loadEngine(x);
1302 engine = engines.at(x);
1303 }
1304 Q_ASSERT(engine != 0);
1305 if (engine->type() == Box)
1306 continue;
1307 glyphs->advances_x[glyph_pos] = glyphs->advances_y[glyph_pos] = 0;
1308 glyphs->offsets[glyph_pos] = QFixedPoint();
1309 int num = 2;
1310 QGlyphLayout offs = glyphs->mid(glyph_pos, num);
1311 engine->stringToCMap(str + i, surrogate ? 2 : 1, &offs, &num, flags);
1312 Q_ASSERT(num == 1); // surrogates only give 1 glyph
1313 if (glyphs->glyphs[glyph_pos]) {
1314 // set the high byte to indicate which engine the glyph came from
1315 glyphs->glyphs[glyph_pos] |= (x << 24);
1316 break;
1317 }
1318 }
1319 // ensure we use metrics from the 1st font when we use the fallback image.
1320 if (!glyphs->glyphs[glyph_pos]) {
1321 glyphs->setInstance(glyph_pos, tmp);
1322 }
1323 }
1324 if (surrogate)
1325 ++i;
1326 ++glyph_pos;
1327 }
1328
1329 *nglyphs = ng;
1330 glyphs->numGlyphs = ng;
1331 return true;
1332}
1333
1334glyph_metrics_t QFontEngineMulti::boundingBox(const QGlyphLayout &glyphs)
1335{
1336 if (glyphs.numGlyphs <= 0)
1337 return glyph_metrics_t();
1338
1339 glyph_metrics_t overall;
1340
1341 int which = highByte(glyphs.glyphs[0]);
1342 int start = 0;
1343 int end, i;
1344 for (end = 0; end < glyphs.numGlyphs; ++end) {
1345 const int e = highByte(glyphs.glyphs[end]);
1346 if (e == which)
1347 continue;
1348
1349 // set the high byte to zero
1350 for (i = start; i < end; ++i)
1351 glyphs.glyphs[i] = stripped(glyphs.glyphs[i]);
1352
1353 // merge the bounding box for this run
1354 const glyph_metrics_t gm = engine(which)->boundingBox(glyphs.mid(start, end - start));
1355
1356 overall.x = qMin(overall.x, gm.x);
1357 overall.y = qMin(overall.y, gm.y);
1358 overall.width = overall.xoff + gm.width;
1359 overall.height = qMax(overall.height + overall.y, gm.height + gm.y) -
1360 qMin(overall.y, gm.y);
1361 overall.xoff += gm.xoff;
1362 overall.yoff += gm.yoff;
1363
1364 // reset the high byte for all glyphs
1365 const int hi = which << 24;
1366 for (i = start; i < end; ++i)
1367 glyphs.glyphs[i] = hi | glyphs.glyphs[i];
1368
1369 // change engine
1370 start = end;
1371 which = e;
1372 }
1373
1374 // set the high byte to zero
1375 for (i = start; i < end; ++i)
1376 glyphs.glyphs[i] = stripped(glyphs.glyphs[i]);
1377
1378 // merge the bounding box for this run
1379 const glyph_metrics_t gm = engine(which)->boundingBox(glyphs.mid(start, end - start));
1380
1381 overall.x = qMin(overall.x, gm.x);
1382 overall.y = qMin(overall.y, gm.y);
1383 overall.width = overall.xoff + gm.width;
1384 overall.height = qMax(overall.height + overall.y, gm.height + gm.y) -
1385 qMin(overall.y, gm.y);
1386 overall.xoff += gm.xoff;
1387 overall.yoff += gm.yoff;
1388
1389 // reset the high byte for all glyphs
1390 const int hi = which << 24;
1391 for (i = start; i < end; ++i)
1392 glyphs.glyphs[i] = hi | glyphs.glyphs[i];
1393
1394 return overall;
1395}
1396
1397void QFontEngineMulti::getGlyphBearings(glyph_t glyph, qreal *leftBearing, qreal *rightBearing)
1398{
1399 int which = highByte(glyph);
1400 engine(which)->getGlyphBearings(stripped(glyph), leftBearing, rightBearing);
1401}
1402
1403void QFontEngineMulti::addOutlineToPath(qreal x, qreal y, const QGlyphLayout &glyphs,
1404 QPainterPath *path, QTextItem::RenderFlags flags)
1405{
1406 if (glyphs.numGlyphs <= 0)
1407 return;
1408
1409 int which = highByte(glyphs.glyphs[0]);
1410 int start = 0;
1411 int end, i;
1412 if (flags & QTextItem::RightToLeft) {
1413 for (int gl = 0; gl < glyphs.numGlyphs; gl++) {
1414 x += glyphs.advances_x[gl].toReal();
1415 y += glyphs.advances_y[gl].toReal();
1416 }
1417 }
1418 for (end = 0; end < glyphs.numGlyphs; ++end) {
1419 const int e = highByte(glyphs.glyphs[end]);
1420 if (e == which)
1421 continue;
1422
1423 if (flags & QTextItem::RightToLeft) {
1424 for (i = start; i < end; ++i) {
1425 x -= glyphs.advances_x[i].toReal();
1426 y -= glyphs.advances_y[i].toReal();
1427 }
1428 }
1429
1430 // set the high byte to zero
1431 for (i = start; i < end; ++i)
1432 glyphs.glyphs[i] = stripped(glyphs.glyphs[i]);
1433 engine(which)->addOutlineToPath(x, y, glyphs.mid(start, end - start), path, flags);
1434 // reset the high byte for all glyphs and update x and y
1435 const int hi = which << 24;
1436 for (i = start; i < end; ++i)
1437 glyphs.glyphs[i] = hi | glyphs.glyphs[i];
1438
1439 if (!(flags & QTextItem::RightToLeft)) {
1440 for (i = start; i < end; ++i) {
1441 x += glyphs.advances_x[i].toReal();
1442 y += glyphs.advances_y[i].toReal();
1443 }
1444 }
1445
1446 // change engine
1447 start = end;
1448 which = e;
1449 }
1450
1451 if (flags & QTextItem::RightToLeft) {
1452 for (i = start; i < end; ++i) {
1453 x -= glyphs.advances_x[i].toReal();
1454 y -= glyphs.advances_y[i].toReal();
1455 }
1456 }
1457
1458 // set the high byte to zero
1459 for (i = start; i < end; ++i)
1460 glyphs.glyphs[i] = stripped(glyphs.glyphs[i]);
1461
1462 engine(which)->addOutlineToPath(x, y, glyphs.mid(start, end - start), path, flags);
1463
1464 // reset the high byte for all glyphs
1465 const int hi = which << 24;
1466 for (i = start; i < end; ++i)
1467 glyphs.glyphs[i] = hi | glyphs.glyphs[i];
1468}
1469
1470void QFontEngineMulti::recalcAdvances(QGlyphLayout *glyphs, QTextEngine::ShaperFlags flags) const
1471{
1472 if (glyphs->numGlyphs <= 0)
1473 return;
1474
1475 int which = highByte(glyphs->glyphs[0]);
1476 int start = 0;
1477 int end, i;
1478 for (end = 0; end < glyphs->numGlyphs; ++end) {
1479 const int e = highByte(glyphs->glyphs[end]);
1480 if (e == which)
1481 continue;
1482
1483 // set the high byte to zero
1484 for (i = start; i < end; ++i)
1485 glyphs->glyphs[i] = stripped(glyphs->glyphs[i]);
1486
1487 QGlyphLayout offs = glyphs->mid(start, end - start);
1488 engine(which)->recalcAdvances(&offs, flags);
1489
1490 // reset the high byte for all glyphs and update x and y
1491 const int hi = which << 24;
1492 for (i = start; i < end; ++i)
1493 glyphs->glyphs[i] = hi | glyphs->glyphs[i];
1494
1495 // change engine
1496 start = end;
1497 which = e;
1498 }
1499
1500 // set the high byte to zero
1501 for (i = start; i < end; ++i)
1502 glyphs->glyphs[i] = stripped(glyphs->glyphs[i]);
1503
1504 QGlyphLayout offs = glyphs->mid(start, end - start);
1505 engine(which)->recalcAdvances(&offs, flags);
1506
1507 // reset the high byte for all glyphs
1508 const int hi = which << 24;
1509 for (i = start; i < end; ++i)
1510 glyphs->glyphs[i] = hi | glyphs->glyphs[i];
1511}
1512
1513void QFontEngineMulti::doKerning(QGlyphLayout *glyphs, QTextEngine::ShaperFlags flags) const
1514{
1515 if (glyphs->numGlyphs <= 0)
1516 return;
1517
1518 int which = highByte(glyphs->glyphs[0]);
1519 int start = 0;
1520 int end, i;
1521 for (end = 0; end < glyphs->numGlyphs; ++end) {
1522 const int e = highByte(glyphs->glyphs[end]);
1523 if (e == which)
1524 continue;
1525
1526 // set the high byte to zero
1527 for (i = start; i < end; ++i)
1528 glyphs->glyphs[i] = stripped(glyphs->glyphs[i]);
1529
1530 QGlyphLayout offs = glyphs->mid(start, end - start);
1531 engine(which)->doKerning(&offs, flags);
1532
1533 // reset the high byte for all glyphs and update x and y
1534 const int hi = which << 24;
1535 for (i = start; i < end; ++i)
1536 glyphs->glyphs[i] = hi | glyphs->glyphs[i];
1537
1538 // change engine
1539 start = end;
1540 which = e;
1541 }
1542
1543 // set the high byte to zero
1544 for (i = start; i < end; ++i)
1545 glyphs->glyphs[i] = stripped(glyphs->glyphs[i]);
1546
1547 QGlyphLayout offs = glyphs->mid(start, end - start);
1548 engine(which)->doKerning(&offs, flags);
1549
1550 // reset the high byte for all glyphs
1551 const int hi = which << 24;
1552 for (i = start; i < end; ++i)
1553 glyphs->glyphs[i] = hi | glyphs->glyphs[i];
1554}
1555
1556glyph_metrics_t QFontEngineMulti::boundingBox(glyph_t glyph)
1557{
1558 const int which = highByte(glyph);
1559 Q_ASSERT(which < engines.size());
1560 return engine(which)->boundingBox(stripped(glyph));
1561}
1562
1563QFixed QFontEngineMulti::ascent() const
1564{ return engine(0)->ascent(); }
1565
1566QFixed QFontEngineMulti::descent() const
1567{ return engine(0)->descent(); }
1568
1569QFixed QFontEngineMulti::leading() const
1570{
1571 return engine(0)->leading();
1572}
1573
1574QFixed QFontEngineMulti::xHeight() const
1575{
1576 return engine(0)->xHeight();
1577}
1578
1579QFixed QFontEngineMulti::averageCharWidth() const
1580{
1581 return engine(0)->averageCharWidth();
1582}
1583
1584QFixed QFontEngineMulti::lineThickness() const
1585{
1586 return engine(0)->lineThickness();
1587}
1588
1589QFixed QFontEngineMulti::underlinePosition() const
1590{
1591 return engine(0)->underlinePosition();
1592}
1593
1594qreal QFontEngineMulti::maxCharWidth() const
1595{
1596 return engine(0)->maxCharWidth();
1597}
1598
1599qreal QFontEngineMulti::minLeftBearing() const
1600{
1601 return engine(0)->minLeftBearing();
1602}
1603
1604qreal QFontEngineMulti::minRightBearing() const
1605{
1606 return engine(0)->minRightBearing();
1607}
1608
1609bool QFontEngineMulti::canRender(const QChar *string, int len)
1610{
1611 if (engine(0)->canRender(string, len))
1612 return true;
1613
1614 QVarLengthGlyphLayoutArray glyphs(len);
1615 int nglyphs = len;
1616 if (stringToCMap(string, len, &glyphs, &nglyphs, QTextEngine::GlyphIndicesOnly) == false) {
1617 glyphs.resize(nglyphs);
1618 stringToCMap(string, len, &glyphs, &nglyphs, QTextEngine::GlyphIndicesOnly);
1619 }
1620
1621 bool allExist = true;
1622 for (int i = 0; i < nglyphs; i++) {
1623 if (!glyphs.glyphs[i]) {
1624 allExist = false;
1625 break;
1626 }
1627 }
1628
1629 return allExist;
1630}
1631
1632QImage QFontEngineMulti::alphaMapForGlyph(glyph_t)
1633{
1634 Q_ASSERT(false);
1635 return QImage();
1636}
1637
1638
1639QT_END_NAMESPACE
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