summaryrefslogtreecommitdiff
path: root/canvas/source/cairo/cairo_textlayout.cxx
blob: d0873b63f5f062338bdffb08fffa6c39d00eda42 (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
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/

// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_canvas.hxx"

#include <math.h>

#include <canvas/debug.hxx>
#include <canvas/verbosetrace.hxx>
#include <tools/diagnose_ex.h>

#include <vcl/metric.hxx>
#include <vcl/virdev.hxx>

#ifdef WNT
#include <tools/prewin.h>
#include <windows.h>
#include <tools/postwin.h>
#ifdef max
#undef max
#endif
#ifdef min
#undef min
#endif
#endif
#include <vcl/sysdata.hxx>

#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/numeric/ftools.hxx>

#include <boost/scoped_array.hpp>

#include "cairo_textlayout.hxx"
#include "cairo_spritecanvas.hxx"

#ifdef CAIRO_HAS_QUARTZ_SURFACE
# include "cairo_quartz_cairo.hxx"
#elif defined CAIRO_HAS_WIN32_SURFACE
# include "cairo_win32_cairo.hxx"
# include <cairo-win32.h>
#elif defined CAIRO_HAS_XLIB_SURFACE
# include "cairo_xlib_cairo.hxx"
# include <cairo-ft.h>
#else
# error Native API needed.
#endif

using namespace ::cairo;
using namespace ::com::sun::star;

namespace cairocanvas
{
    namespace
    {
        void setupLayoutMode( OutputDevice& rOutDev,
                              sal_Int8      nTextDirection )
        {
            // TODO(P3): avoid if already correctly set
            ULONG nLayoutMode;
            switch( nTextDirection )
            {
                default:
                    nLayoutMode = 0;
                    break;
                case rendering::TextDirection::WEAK_LEFT_TO_RIGHT:
                    nLayoutMode = TEXT_LAYOUT_BIDI_LTR;
                    break;
                case rendering::TextDirection::STRONG_LEFT_TO_RIGHT:
                    nLayoutMode = TEXT_LAYOUT_BIDI_LTR | TEXT_LAYOUT_BIDI_STRONG;
                    break;
                case rendering::TextDirection::WEAK_RIGHT_TO_LEFT:
                    nLayoutMode = TEXT_LAYOUT_BIDI_RTL;
                    break;
                case rendering::TextDirection::STRONG_RIGHT_TO_LEFT:
                    nLayoutMode = TEXT_LAYOUT_BIDI_RTL | TEXT_LAYOUT_BIDI_STRONG;
                    break;
            }

            // set calculated layout mode. Origin is always the left edge,
            // as required at the API spec
            rOutDev.SetLayoutMode( nLayoutMode | TEXT_LAYOUT_TEXTORIGIN_LEFT );
        }
    }

    TextLayout::TextLayout( const rendering::StringContext&     aText,
                            sal_Int8                            nDirection,
                            sal_Int64                           /*nRandomSeed*/,
                            const CanvasFont::Reference&        rFont,
                            const SurfaceProviderRef&           rRefDevice ) :
        TextLayout_Base( m_aMutex ),
        maText( aText ),
        maLogicalAdvancements(),
        mpFont( rFont ),
        mpRefDevice( rRefDevice ),
        mnTextDirection( nDirection )
    {
    }

    TextLayout::~TextLayout()
    {
    }

    void SAL_CALL TextLayout::disposing()
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        mpFont.reset();
        mpRefDevice.clear();
    }

    // XTextLayout
    uno::Sequence< uno::Reference< rendering::XPolyPolygon2D > > SAL_CALL TextLayout::queryTextShapes(  ) throw (uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return uno::Sequence< uno::Reference< rendering::XPolyPolygon2D > >();
    }

    uno::Sequence< geometry::RealRectangle2D > SAL_CALL TextLayout::queryInkMeasures(  ) throw (uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return uno::Sequence< geometry::RealRectangle2D >();
    }

    uno::Sequence< geometry::RealRectangle2D > SAL_CALL TextLayout::queryMeasures(  ) throw (uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return uno::Sequence< geometry::RealRectangle2D >();
    }

    uno::Sequence< double > SAL_CALL TextLayout::queryLogicalAdvancements(  ) throw (uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        return maLogicalAdvancements;
    }

    void SAL_CALL TextLayout::applyLogicalAdvancements( const uno::Sequence< double >& aAdvancements ) throw (lang::IllegalArgumentException, uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        if( aAdvancements.getLength() != maText.Length )
        {
            OSL_TRACE( "TextLayout::applyLogicalAdvancements(): mismatching number of advancements" );
            throw lang::IllegalArgumentException();
        }

        maLogicalAdvancements = aAdvancements;
    }

    geometry::RealRectangle2D SAL_CALL TextLayout::queryTextBounds(  ) throw (uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        OutputDevice* pOutDev = mpRefDevice->getOutputDevice();
        if( !pOutDev )
            return geometry::RealRectangle2D();

        VirtualDevice aVDev( *pOutDev );
        aVDev.SetFont( mpFont->getVCLFont() );

        // need metrics for Y offset, the XCanvas always renders
        // relative to baseline
        const ::FontMetric& aMetric( aVDev.GetFontMetric() );

        setupLayoutMode( aVDev, mnTextDirection );

        const sal_Int32 nAboveBaseline( -aMetric.GetIntLeading() - aMetric.GetAscent() );
        const sal_Int32 nBelowBaseline( aMetric.GetDescent() );

        if( maLogicalAdvancements.getLength() )
        {
            return geometry::RealRectangle2D( 0, nAboveBaseline,
                                              maLogicalAdvancements[ maLogicalAdvancements.getLength()-1 ],
                                              nBelowBaseline );
        }
        else
        {
            return geometry::RealRectangle2D( 0, nAboveBaseline,
                                              aVDev.GetTextWidth(
                                                  maText.Text,
                                                  ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
                                                  ::canvas::tools::numeric_cast<USHORT>(maText.Length) ),
                                              nBelowBaseline );
        }
    }

    double SAL_CALL TextLayout::justify( double /*nSize*/ ) throw (lang::IllegalArgumentException, uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return 0.0;
    }

    double SAL_CALL TextLayout::combinedJustify( const uno::Sequence< uno::Reference< rendering::XTextLayout > >& /*aNextLayouts*/,
                                                 double /*nSize*/ ) throw (lang::IllegalArgumentException, uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return 0.0;
    }

    rendering::TextHit SAL_CALL TextLayout::getTextHit( const geometry::RealPoint2D& /*aHitPoint*/ ) throw (uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return rendering::TextHit();
    }

    rendering::Caret SAL_CALL TextLayout::getCaret( sal_Int32 /*nInsertionIndex*/,
                                                    sal_Bool /*bExcludeLigatures*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return rendering::Caret();
    }

    sal_Int32 SAL_CALL TextLayout::getNextInsertionIndex( sal_Int32 /*nStartIndex*/,
                                                          sal_Int32 /*nCaretAdvancement*/,
                                                          sal_Bool /*bExcludeLigatures*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return 0;
    }

    uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryVisualHighlighting( sal_Int32 /*nStartIndex*/,
                                                                                              sal_Int32 /*nEndIndex*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return uno::Reference< rendering::XPolyPolygon2D >();
    }

    uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryLogicalHighlighting( sal_Int32 /*nStartIndex*/,
                                                                                               sal_Int32 /*nEndIndex*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return uno::Reference< rendering::XPolyPolygon2D >();
    }

    double SAL_CALL TextLayout::getBaselineOffset(  ) throw (uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        // TODO
        return 0.0;
    }

    sal_Int8 SAL_CALL TextLayout::getMainTextDirection(  ) throw (uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        return mnTextDirection;
    }

    uno::Reference< rendering::XCanvasFont > SAL_CALL TextLayout::getFont(  ) throw (uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        return mpFont.getRef();
    }

    rendering::StringContext SAL_CALL TextLayout::getText(  ) throw (uno::RuntimeException)
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        return maText;
    }

    void TextLayout::useFont( Cairo* pCairo )
    {
    rendering::FontRequest aFontRequest = mpFont->getFontRequest();
    rendering::FontInfo aFontInfo = aFontRequest.FontDescription;

    cairo_select_font_face( pCairo, ::rtl::OUStringToOString( aFontInfo.FamilyName, RTL_TEXTENCODING_UTF8 ), CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL );
    cairo_set_font_size( pCairo, aFontRequest.CellSize );
    }

  /** TextLayout:draw
   *
   * This function uses the "toy" api of the cairo library
   *
   **/
    bool TextLayout::draw( Cairo* pCairo )
    {
        ::osl::MutexGuard aGuard( m_aMutex );

        ::rtl::OUString aSubText = maText.Text.copy( maText.StartPosition, maText.Length );
        ::rtl::OString aUTF8String = ::rtl::OUStringToOString( aSubText, RTL_TEXTENCODING_UTF8 );

        cairo_save( pCairo );
        /* move to 0, 0 as cairo_show_text advances current point and current point is not restored by cairo_restore.
           before we were depending on unmodified current point which I believed was preserved by save/restore */
        cairo_move_to( pCairo, 0, 0 );
        useFont( pCairo );
        cairo_show_text( pCairo, aUTF8String );
        cairo_restore( pCairo );

        return true;
    }


  /**
   * TextLayout::isCairoRenderable
   *
   * Features currenly not supported by Cairo (VCL rendering is used as fallback):
   * - vertical glyphs
   *
   * @return true, if text/font can be rendered with cairo
   **/
    bool TextLayout::isCairoRenderable(SystemFontData aSysFontData) const
    {
#if defined UNX && !defined QUARTZ
        // is font usable?
        if (!aSysFontData.nFontId) return false;
#endif

        // vertical glyph rendering is not supported in cairo for now
        if (aSysFontData.bVerticalCharacterType) {
            OSL_TRACE(":cairocanvas::TextLayout::isCairoRenderable(): ***************** VERTICAL CHARACTER STYLE!!! ****************");
            return false;
        }

        return true;
    }


  /**
   * TextLayout::draw
   *
   * Cairo-based text rendering. Draw text directly on the cairo surface with cairo fonts.
   * Avoid using VCL VirtualDevices for that, bypassing VCL DrawText functions, when possible
   *
   * Note: some text effects are not rendered due to lacking generic canvas or cairo canvas
   *       implementation. See issues 92657, 92658, 92659, 92660, 97529
   *
   * @return true, if successful
   **/
    bool TextLayout::draw( SurfaceSharedPtr&             pSurface,
                           OutputDevice&                 rOutDev,
                           const Point&                  rOutpos,
                           const rendering::ViewState&   viewState,
                           const rendering::RenderState& renderState ) const
    {
        ::osl::MutexGuard aGuard( m_aMutex );
        SystemTextLayoutData aSysLayoutData;
#if (defined CAIRO_HAS_WIN32_SURFACE) && (OSL_DEBUG_LEVEL > 1)
        LOGFONTW logfont;
#endif
        setupLayoutMode( rOutDev, mnTextDirection );

        // TODO(P2): cache that
        ::boost::scoped_array< sal_Int32 > aOffsets(new sal_Int32[maLogicalAdvancements.getLength()]);

        if( maLogicalAdvancements.getLength() )
        {
            setupTextOffsets( aOffsets.get(), maLogicalAdvancements, viewState, renderState );

            // TODO(F3): ensure correct length and termination for DX
            // array (last entry _must_ contain the overall width)
        }

        aSysLayoutData = rOutDev.GetSysTextLayoutData(rOutpos, maText.Text,
                                                      ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
                                                      ::canvas::tools::numeric_cast<USHORT>(maText.Length),
                                                      maLogicalAdvancements.getLength() ? aOffsets.get() : NULL);

        // The ::GetSysTextLayoutData(), i.e. layouting of text to glyphs can change the font being used.
        // The fallback checks need to be done after final font is known.
        if (!isCairoRenderable(aSysLayoutData.aSysFontData))    // VCL FALLBACKS
        {
            OSL_TRACE(":cairocanvas::TextLayout::draw(S,O,p,v,r): VCL FALLBACK %s%s%s%s - %s",
                      maLogicalAdvancements.getLength() ? "ADV " : "",
                      aSysLayoutData.aSysFontData.bAntialias ? "AA " : "",
                      aSysLayoutData.aSysFontData.bFakeBold ? "FB " : "",
                      aSysLayoutData.aSysFontData.bFakeItalic ? "FI " : "",
                      ::rtl::OUStringToOString( maText.Text.copy( maText.StartPosition, maText.Length ),
                                                RTL_TEXTENCODING_UTF8 ).getStr());

            if (maLogicalAdvancements.getLength())        // VCL FALLBACK - with glyph advances
            {
                rOutDev.DrawTextArray( rOutpos, maText.Text, aOffsets.get(),
                                       ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
                                       ::canvas::tools::numeric_cast<USHORT>(maText.Length) );
                return true;
            }
            else                                               // VCL FALLBACK - without advances
            {
                rOutDev.DrawText( rOutpos, maText.Text,
                                  ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
                                  ::canvas::tools::numeric_cast<USHORT>(maText.Length) );
                return true;
            }
        }

        if (aSysLayoutData.rGlyphData.empty()) return false; //??? false?

        /**
         * Setup platform independent glyph vector into cairo-based glyphs vector.
         **/

        // setup glyphs
        std::vector<cairo_glyph_t> cairo_glyphs;
        cairo_glyphs.reserve( 256 );

        for( int nStart = 0; nStart < (int) aSysLayoutData.rGlyphData.size(); nStart++ )
        {
            cairo_glyph_t aGlyph;
            SystemGlyphData systemGlyph = aSysLayoutData.rGlyphData.at(nStart);
            aGlyph.index = systemGlyph.index;
#ifdef CAIRO_HAS_WIN32_SURFACE
            // Cairo requires standard glyph indexes (ETO_GLYPH_INDEX), while vcl/win/* uses ucs4 chars.
            // Convert to standard indexes
            aGlyph.index = cairo::ucs4toindex((unsigned int) aGlyph.index, aSysLayoutData.aSysFontData.hFont);
#endif
            aGlyph.x = systemGlyph.x;
            aGlyph.y = systemGlyph.y;
            cairo_glyphs.push_back(aGlyph);
        }

        if (cairo_glyphs.empty()) return true;  //true or false??

        /**
         * Setup font
         **/
        cairo_font_face_t* font_face = NULL;

#ifdef CAIRO_HAS_QUARTZ_SURFACE
        // TODO: use cairo_quartz_font_face_create_for_cgfont(cgFont)
        //       when CGFont (Mac OS X 10.5 API) is provided by the AQUA VCL backend.
        font_face = cairo_quartz_font_face_create_for_atsu_font_id((ATSUFontID) aSysLayoutData.aSysFontData.aATSUFontID);

#elif defined CAIRO_HAS_WIN32_SURFACE
  #if (OSL_DEBUG_LEVEL > 1)
        GetObjectW( aSysLayoutData.aSysFontData.hFont, sizeof(logfont), &logfont );
  #endif
        // Note: cairo library uses logfont fallbacks when lfEscapement, lfOrientation and lfWidth are not zero.
        // VCL always has non-zero value for lfWidth
        font_face = cairo_win32_font_face_create_for_hfont(aSysLayoutData.aSysFontData.hFont);

#elif defined CAIRO_HAS_XLIB_SURFACE
        font_face = cairo_ft_font_face_create_for_ft_face((FT_Face)aSysLayoutData.aSysFontData.nFontId,
                                                          aSysLayoutData.aSysFontData.nFontFlags);
#else
# error Native API needed.
#endif

        CairoSharedPtr pSCairo = pSurface->getCairo();

        cairo_set_font_face( pSCairo.get(), font_face);

        // create default font options. cairo_get_font_options() does not retrieve the surface defaults,
        // only what has been set before with cairo_set_font_options()
        cairo_font_options_t* options = cairo_font_options_create();
        if (aSysLayoutData.aSysFontData.bAntialias) {
            // CAIRO_ANTIALIAS_GRAY provides more similar result to VCL Canvas,
            // so we're not using CAIRO_ANTIALIAS_SUBPIXEL
            cairo_font_options_set_antialias(options, CAIRO_ANTIALIAS_GRAY);
        }
        cairo_set_font_options( pSCairo.get(), options);

        // Font color
        Color mTextColor = rOutDev.GetTextColor();
        cairo_set_source_rgb(pSCairo.get(),
                             mTextColor.GetRed()/255.0,
                             mTextColor.GetGreen()/255.0,
                             mTextColor.GetBlue()/255.0);

        // Font rotation and scaling
        cairo_matrix_t m;
        Font aFont = rOutDev.GetFont();
        FontMetric aMetric( rOutDev.GetFontMetric(aFont) );
        long nWidth = 0;

        // width calculation is deep magic and platform/font dependant.
        // width == 0 means no scaling, and usually width == height means the same.
        // Other values mean horizontal scaling (narrow or stretching)
        // see issue #101566

        //proper scale calculation across platforms
        if (aFont.GetWidth() == 0) {
            nWidth = aFont.GetHeight();
        } else {
            // any scaling needs to be relative to the platform-dependent definition
            // of height of the font
            nWidth = aFont.GetWidth() * aFont.GetHeight() / aMetric.GetHeight();
        }

        cairo_matrix_init_identity(&m);

        if (aSysLayoutData.orientation) cairo_matrix_rotate(&m, (3600 - aSysLayoutData.orientation) * M_PI / 1800.0);

        cairo_matrix_scale(&m, nWidth, aFont.GetHeight());

        //faux italics
        if (aSysLayoutData.aSysFontData.bFakeItalic) m.xy = -m.xx * 0x6000L / 0x10000L;

        cairo_set_font_matrix(pSCairo.get(), &m);

        OSL_TRACE("\r\n:cairocanvas::TextLayout::draw(S,O,p,v,r): Size:(%d,%d), W:%d->%d, Pos (%d,%d), G(%d,%d,%d) %s%s%s%s || Name:%s - %s",
                  aFont.GetWidth(),
                  aFont.GetHeight(),
                  aMetric.GetWidth(),
                  nWidth,
                  (int) rOutpos.X(),
                  (int) rOutpos.Y(),
                  cairo_glyphs[0].index, cairo_glyphs[1].index, cairo_glyphs[2].index,
                  maLogicalAdvancements.getLength() ? "ADV " : "",
                  aSysLayoutData.aSysFontData.bAntialias ? "AA " : "",
                  aSysLayoutData.aSysFontData.bFakeBold ? "FB " : "",
                  aSysLayoutData.aSysFontData.bFakeItalic ? "FI " : "",
#if (defined CAIRO_HAS_WIN32_SURFACE) && (OSL_DEBUG_LEVEL > 1)
                  ::rtl::OUStringToOString( reinterpret_cast<const sal_Unicode*> (logfont.lfFaceName), RTL_TEXTENCODING_UTF8 ).getStr(),
#else
                  ::rtl::OUStringToOString( aFont.GetName(), RTL_TEXTENCODING_UTF8 ).getStr(),
#endif
                  ::rtl::OUStringToOString( maText.Text.copy( maText.StartPosition, maText.Length ),
                                            RTL_TEXTENCODING_UTF8 ).getStr()
            );

        cairo_show_glyphs(pSCairo.get(), &cairo_glyphs[0], cairo_glyphs.size());

        //faux bold
        if (aSysLayoutData.aSysFontData.bFakeBold) {
            double bold_dx = 0.5 * sqrt( 0.7 * aFont.GetHeight() );
            int total_steps = 2 * ((int) (bold_dx + 0.5));

            // loop to draw the text for every half pixel of displacement
            for (int nSteps = 0; nSteps < total_steps; nSteps++) {
                for(int nGlyphIdx = 0; nGlyphIdx < (int) cairo_glyphs.size(); nGlyphIdx++) {
                    cairo_glyphs[nGlyphIdx].x += bold_dx * nSteps / total_steps;
                }
                cairo_show_glyphs(pSCairo.get(), &cairo_glyphs[0], cairo_glyphs.size());
            }
            OSL_TRACE(":cairocanvas::TextLayout::draw(S,O,p,v,r): FAKEBOLD - dx:%d", (int) bold_dx);
        }

        cairo_restore( pSCairo.get() );
        cairo_font_face_destroy(font_face);
        return true;
    }


    namespace
    {
        class OffsetTransformer
        {
        public:
            OffsetTransformer( const ::basegfx::B2DHomMatrix& rMat ) :
                maMatrix( rMat )
            {
            }

            sal_Int32 operator()( const double& rOffset )
            {
                // This is an optimization of the normal rMat*[x,0]
                // transformation of the advancement vector (in x
                // direction), followed by a length calculation of the
                // resulting vector: advancement' =
                // ||rMat*[x,0]||. Since advancements are vectors, we
                // can ignore translational components, thus if [x,0],
                // it follows that rMat*[x,0]=[x',0] holds. Thus, we
                // just have to calc the transformation of the x
                // component.

                // TODO(F2): Handle non-horizontal advancements!
                return ::basegfx::fround( hypot(maMatrix.get(0,0)*rOffset,
                                                maMatrix.get(1,0)*rOffset) );
            }

        private:
            ::basegfx::B2DHomMatrix maMatrix;
        };
    }

    void TextLayout::setupTextOffsets( sal_Int32*                       outputOffsets,
                                       const uno::Sequence< double >&   inputOffsets,
                                       const rendering::ViewState&      viewState,
                                       const rendering::RenderState&    renderState     ) const
    {
        ENSURE_OR_THROW( outputOffsets!=NULL,
                          "TextLayout::setupTextOffsets offsets NULL" );

        ::basegfx::B2DHomMatrix aMatrix;

        ::canvas::tools::mergeViewAndRenderTransform(aMatrix,
                                                     viewState,
                                                     renderState);

        // fill integer offsets
        ::std::transform( const_cast< uno::Sequence< double >& >(inputOffsets).getConstArray(),
                          const_cast< uno::Sequence< double >& >(inputOffsets).getConstArray()+inputOffsets.getLength(),
                          outputOffsets,
                          OffsetTransformer( aMatrix ) );
    }

#define SERVICE_NAME "com.sun.star.rendering.TextLayout"
#define IMPLEMENTATION_NAME "CairoCanvas::TextLayout"

    ::rtl::OUString SAL_CALL TextLayout::getImplementationName() throw( uno::RuntimeException )
    {
        return ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( IMPLEMENTATION_NAME ) );
    }

    sal_Bool SAL_CALL TextLayout::supportsService( const ::rtl::OUString& ServiceName ) throw( uno::RuntimeException )
    {
        return ServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM ( SERVICE_NAME ) );
    }

    uno::Sequence< ::rtl::OUString > SAL_CALL TextLayout::getSupportedServiceNames()  throw( uno::RuntimeException )
    {
        uno::Sequence< ::rtl::OUString > aRet(1);
        aRet[0] = ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM ( SERVICE_NAME ) );

        return aRet;
    }
}