canvas/source/cairo/cairo_textlayout.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_canvas.hxx"
  33
  34 #include <math.h>
  35
  36 #include <canvas/debug.hxx>
  37 #include <canvas/verbosetrace.hxx>
  38 #include <tools/diagnose_ex.h>
  39
  40 #include <vcl/metric.hxx>
  41 #include <vcl/virdev.hxx>
  42
  43 #ifdef WNT
  44 #include <tools/prewin.h>
  45 #include <windows.h>
  46 #include <tools/postwin.h>
  47 #endif
  48 #include <vcl/sysdata.hxx>
  49
  50 #include <basegfx/matrix/b2dhommatrix.hxx>
  51 #include <basegfx/numeric/ftools.hxx>
  52
  53 #include <boost/scoped_array.hpp>
  54
  55 #include "cairo_textlayout.hxx"
  56 #include "cairo_spritecanvas.hxx"
  57
  58 #ifdef CAIRO_HAS_QUARTZ_SURFACE
  59 # include "cairo_quartz_cairo.hxx"
  60 #elif defined CAIRO_HAS_WIN32_SURFACE
  61 # include "cairo_win32_cairo.hxx"
  62 # include <cairo-win32.h>
  63 #elif defined CAIRO_HAS_XLIB_SURFACE
  64 # include "cairo_xlib_cairo.hxx"
  65 # include <cairo-ft.h>
  66 #else
  67 # error Native API needed.
  68 #endif
  69
  70 using namespace ::cairo;
  71 using namespace ::com::sun::star;
  72
  73 namespace cairocanvas
  74 {
  75     namespace
  76     {
  77         void setupLayoutMode( OutputDevice& rOutDev,
  78                               sal_Int8          nTextDirection )
  79         {
  80             // TODO(P3): avoid if already correctly set
  81             ULONG nLayoutMode;
  82             switch( nTextDirection )
  83             {
  84                 default:
  85                     nLayoutMode = 0;
  86                     break;
  87                 case rendering::TextDirection::WEAK_LEFT_TO_RIGHT:
  88                     nLayoutMode = TEXT_LAYOUT_BIDI_LTR;
  89                     break;
  90                 case rendering::TextDirection::STRONG_LEFT_TO_RIGHT:
  91                     nLayoutMode = TEXT_LAYOUT_BIDI_LTR | TEXT_LAYOUT_BIDI_STRONG;
  92                     break;
  93                 case rendering::TextDirection::WEAK_RIGHT_TO_LEFT:
  94                     nLayoutMode = TEXT_LAYOUT_BIDI_RTL;
  95                     break;
  96                 case rendering::TextDirection::STRONG_RIGHT_TO_LEFT:
  97                     nLayoutMode = TEXT_LAYOUT_BIDI_RTL | TEXT_LAYOUT_BIDI_STRONG;
  98                     break;
  99             }
 100
 101             // set calculated layout mode. Origin is always the left edge,
 102             // as required at the API spec
 103             rOutDev.SetLayoutMode( nLayoutMode | TEXT_LAYOUT_TEXTORIGIN_LEFT );
 104         }
 105     }
 106
 107     TextLayout::TextLayout( const rendering::StringContext&     aText,
 108                             sal_Int8                            nDirection,
 109                             sal_Int64                           /*nRandomSeed*/,
 110                             const CanvasFont::Reference&        rFont,
 111                             const SurfaceProviderRef&                   rRefDevice ) :
 112         TextLayout_Base( m_aMutex ),
 113         maText( aText ),
 114         maLogicalAdvancements(),
 115         mpFont( rFont ),
 116         mpRefDevice( rRefDevice ),
 117         mnTextDirection( nDirection )
 118     {
 119     }
 120
 121     TextLayout::~TextLayout()
 122     {
 123     }
 124
 125     void SAL_CALL TextLayout::disposing()
 126     {
 127         ::osl::MutexGuard aGuard( m_aMutex );
 128
 129         mpFont.reset();
 130         mpRefDevice.clear();
 131     }
 132
 133     // XTextLayout
 134     uno::Sequence< uno::Reference< rendering::XPolyPolygon2D > > SAL_CALL TextLayout::queryTextShapes(  ) throw (uno::RuntimeException)
 135     {
 136         ::osl::MutexGuard aGuard( m_aMutex );
 137
 138         // TODO
 139         return uno::Sequence< uno::Reference< rendering::XPolyPolygon2D > >();
 140     }
 141
 142     uno::Sequence< geometry::RealRectangle2D > SAL_CALL TextLayout::queryInkMeasures(  ) throw (uno::RuntimeException)
 143     {
 144         ::osl::MutexGuard aGuard( m_aMutex );
 145
 146         // TODO
 147         return uno::Sequence< geometry::RealRectangle2D >();
 148     }
 149
 150     uno::Sequence< geometry::RealRectangle2D > SAL_CALL TextLayout::queryMeasures(  ) throw (uno::RuntimeException)
 151     {
 152         ::osl::MutexGuard aGuard( m_aMutex );
 153
 154         // TODO
 155         return uno::Sequence< geometry::RealRectangle2D >();
 156     }
 157
 158     uno::Sequence< double > SAL_CALL TextLayout::queryLogicalAdvancements(  ) throw (uno::RuntimeException)
 159     {
 160         ::osl::MutexGuard aGuard( m_aMutex );
 161
 162         return maLogicalAdvancements;
 163     }
 164
 165     void SAL_CALL TextLayout::applyLogicalAdvancements( const uno::Sequence< double >& aAdvancements ) throw (lang::IllegalArgumentException, uno::RuntimeException)
 166     {
 167         ::osl::MutexGuard aGuard( m_aMutex );
 168
 169         if( aAdvancements.getLength() != maText.Length )
 170         {
 171             OSL_TRACE( "TextLayout::applyLogicalAdvancements(): mismatching number of advancements" );
 172             throw lang::IllegalArgumentException();
 173         }
 174
 175         maLogicalAdvancements = aAdvancements;
 176     }
 177
 178     geometry::RealRectangle2D SAL_CALL TextLayout::queryTextBounds(  ) throw (uno::RuntimeException)
 179     {
 180         ::osl::MutexGuard aGuard( m_aMutex );
 181
 182         OutputDevice* pOutDev = mpRefDevice->getOutputDevice();
 183         if( !pOutDev )
 184             return geometry::RealRectangle2D();
 185
 186         VirtualDevice aVDev( *pOutDev );
 187         aVDev.SetFont( mpFont->getVCLFont() );
 188
 189         // need metrics for Y offset, the XCanvas always renders
 190         // relative to baseline
 191         const ::FontMetric& aMetric( aVDev.GetFontMetric() );
 192
 193         setupLayoutMode( aVDev, mnTextDirection );
 194
 195         const sal_Int32 nAboveBaseline( -aMetric.GetIntLeading() - aMetric.GetAscent() );
 196         const sal_Int32 nBelowBaseline( aMetric.GetDescent() );
 197
 198         if( maLogicalAdvancements.getLength() )
 199         {
 200             return geometry::RealRectangle2D( 0, nAboveBaseline,
 201                                               maLogicalAdvancements[ maLogicalAdvancements.getLength()-1 ],
 202                                               nBelowBaseline );
 203         }
 204         else
 205         {
 206             return geometry::RealRectangle2D( 0, nAboveBaseline,
 207                                               aVDev.GetTextWidth(
 208                                                   maText.Text,
 209                                                   ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
 210                                                   ::canvas::tools::numeric_cast<USHORT>(maText.Length) ),
 211                                               nBelowBaseline );
 212         }
 213     }
 214
 215     double SAL_CALL TextLayout::justify( double /*nSize*/ ) throw (lang::IllegalArgumentException, uno::RuntimeException)
 216     {
 217         ::osl::MutexGuard aGuard( m_aMutex );
 218
 219         // TODO
 220         return 0.0;
 221     }
 222
 223     double SAL_CALL TextLayout::combinedJustify( const uno::Sequence< uno::Reference< rendering::XTextLayout > >& /*aNextLayouts*/,
 224                                                  double /*nSize*/ ) throw (lang::IllegalArgumentException, uno::RuntimeException)
 225     {
 226         ::osl::MutexGuard aGuard( m_aMutex );
 227
 228         // TODO
 229         return 0.0;
 230     }
 231
 232     rendering::TextHit SAL_CALL TextLayout::getTextHit( const geometry::RealPoint2D& /*aHitPoint*/ ) throw (uno::RuntimeException)
 233     {
 234         ::osl::MutexGuard aGuard( m_aMutex );
 235
 236         // TODO
 237         return rendering::TextHit();
 238     }
 239
 240     rendering::Caret SAL_CALL TextLayout::getCaret( sal_Int32 /*nInsertionIndex*/,
 241                                                     sal_Bool /*bExcludeLigatures*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
 242     {
 243         ::osl::MutexGuard aGuard( m_aMutex );
 244
 245         // TODO
 246         return rendering::Caret();
 247     }
 248
 249     sal_Int32 SAL_CALL TextLayout::getNextInsertionIndex( sal_Int32 /*nStartIndex*/,
 250                                                           sal_Int32 /*nCaretAdvancement*/,
 251                                                           sal_Bool /*bExcludeLigatures*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
 252     {
 253         ::osl::MutexGuard aGuard( m_aMutex );
 254
 255         // TODO
 256         return 0;
 257     }
 258
 259     uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryVisualHighlighting( sal_Int32 /*nStartIndex*/,
 260                                                                                               sal_Int32 /*nEndIndex*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
 261     {
 262         ::osl::MutexGuard aGuard( m_aMutex );
 263
 264         // TODO
 265         return uno::Reference< rendering::XPolyPolygon2D >();
 266     }
 267
 268     uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryLogicalHighlighting( sal_Int32 /*nStartIndex*/,
 269                                                                                                sal_Int32 /*nEndIndex*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
 270     {
 271         ::osl::MutexGuard aGuard( m_aMutex );
 272
 273         // TODO
 274         return uno::Reference< rendering::XPolyPolygon2D >();
 275     }
 276
 277     double SAL_CALL TextLayout::getBaselineOffset(  ) throw (uno::RuntimeException)
 278     {
 279         ::osl::MutexGuard aGuard( m_aMutex );
 280
 281         // TODO
 282         return 0.0;
 283     }
 284
 285     sal_Int8 SAL_CALL TextLayout::getMainTextDirection(  ) throw (uno::RuntimeException)
 286     {
 287         ::osl::MutexGuard aGuard( m_aMutex );
 288
 289         return mnTextDirection;
 290     }
 291
 292     uno::Reference< rendering::XCanvasFont > SAL_CALL TextLayout::getFont(  ) throw (uno::RuntimeException)
 293     {
 294         ::osl::MutexGuard aGuard( m_aMutex );
 295
 296         return mpFont.getRef();
 297     }
 298
 299     rendering::StringContext SAL_CALL TextLayout::getText(  ) throw (uno::RuntimeException)
 300     {
 301         ::osl::MutexGuard aGuard( m_aMutex );
 302
 303         return maText;
 304     }
 305
 306     void TextLayout::useFont( Cairo* pCairo )
 307     {
 308     rendering::FontRequest aFontRequest = mpFont->getFontRequest();
 309     rendering::FontInfo aFontInfo = aFontRequest.FontDescription;
 310
 311     cairo_select_font_face( pCairo, ::rtl::OUStringToOString( aFontInfo.FamilyName, RTL_TEXTENCODING_UTF8 ), CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL );
 312     cairo_set_font_size( pCairo, aFontRequest.CellSize );
 313     }
 314
 315   /** TextLayout:draw
 316    *
 317    * This function uses the "toy" api of the cairo library
 318    *
 319    **/
 320     bool TextLayout::draw( Cairo* pCairo )
 321     {
 322         ::osl::MutexGuard aGuard( m_aMutex );
 323
 324         ::rtl::OUString aSubText = maText.Text.copy( maText.StartPosition, maText.Length );
 325         ::rtl::OString aUTF8String = ::rtl::OUStringToOString( aSubText, RTL_TEXTENCODING_UTF8 );
 326
 327         cairo_save( pCairo );
 328         /* move to 0, 0 as cairo_show_text advances current point and current point is not restored by cairo_restore.
 329            before we were depending on unmodified current point which I believed was preserved by save/restore */
 330         cairo_move_to( pCairo, 0, 0 );
 331         useFont( pCairo );
 332         cairo_show_text( pCairo, aUTF8String );
 333         cairo_restore( pCairo );
 334
 335         return true;
 336     }
 337
 338
 339   /**
 340    * TextLayout::isCairoRenderable
 341    *
 342    * Features currenly not supported by Cairo (VCL rendering is used as fallback):
 343    * - vertical glyphs
 344    *
 345    * @return true, if text/font can be rendered with cairo
 346    **/
 347     bool TextLayout::isCairoRenderable(SystemFontData aSysFontData) const
 348     {
 349 #if defined UNX && !defined QUARTZ
 350         // is font usable?
 351         if (!aSysFontData.nFontId) return false;
 352 #endif
 353
 354         // vertical glyph rendering is not supported in cairo for now
 355         if (aSysFontData.bVerticalCharacterType) {
 356             OSL_TRACE(":cairocanvas::TextLayout::isCairoRenderable(): ***************** VERTICAL CHARACTER STYLE!!! ****************");
 357             return false;
 358         }
 359
 360         return true;
 361     }
 362
 363
 364   /**
 365    * TextLayout::draw
 366    *
 367    * Cairo-based text rendering. Draw text directly on the cairo surface with cairo fonts.
 368    * Avoid using VCL VirtualDevices for that, bypassing VCL DrawText functions, when possible
 369    *
 370    * Note: some text effects are not rendered due to lacking generic canvas or cairo canvas
 371    *       implementation. See issues 92657, 92658, 92659, 92660, 97529
 372    *
 373    * @return true, if successful
 374    **/
 375     bool TextLayout::draw( SurfaceSharedPtr&             pSurface,
 376                            OutputDevice&                 rOutDev,
 377                            const Point&                  rOutpos,
 378                            const rendering::ViewState&   viewState,
 379                            const rendering::RenderState& renderState ) const
 380     {
 381         ::osl::MutexGuard aGuard( m_aMutex );
 382         SystemTextLayoutData aSysLayoutData;
 383 #if (defined CAIRO_HAS_WIN32_SURFACE) && (OSL_DEBUG_LEVEL > 1)
 384         LOGFONTW logfont;
 385 #endif
 386         setupLayoutMode( rOutDev, mnTextDirection );
 387
 388         // TODO(P2): cache that
 389         ::boost::scoped_array< sal_Int32 > aOffsets(new sal_Int32[maLogicalAdvancements.getLength()]);
 390
 391         if( maLogicalAdvancements.getLength() )
 392         {
 393             setupTextOffsets( aOffsets.get(), maLogicalAdvancements, viewState, renderState );
 394
 395             // TODO(F3): ensure correct length and termination for DX
 396             // array (last entry _must_ contain the overall width)
 397         }
 398
 399         aSysLayoutData = rOutDev.GetSysTextLayoutData(rOutpos, maText.Text,
 400                                                       ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
 401                                                       ::canvas::tools::numeric_cast<USHORT>(maText.Length),
 402                                                       maLogicalAdvancements.getLength() ? aOffsets.get() : NULL);
 403
 404         // The ::GetSysTextLayoutData(), i.e. layouting of text to glyphs can change the font being used.
 405         // The fallback checks need to be done after final font is known.
 406         if (!isCairoRenderable(aSysLayoutData.aSysFontData))    // VCL FALLBACKS
 407         {
 408             OSL_TRACE(":cairocanvas::TextLayout::draw(S,O,p,v,r): VCL FALLBACK %s%s%s%s - %s",
 409                       maLogicalAdvancements.getLength() ? "ADV " : "",
 410                       aSysLayoutData.aSysFontData.bAntialias ? "AA " : "",
 411                       aSysLayoutData.aSysFontData.bFakeBold ? "FB " : "",
 412                       aSysLayoutData.aSysFontData.bFakeItalic ? "FI " : "",
 413                       ::rtl::OUStringToOString( maText.Text.copy( maText.StartPosition, maText.Length ),
 414                                                 RTL_TEXTENCODING_UTF8 ).getStr());
 415
 416             if (maLogicalAdvancements.getLength())        // VCL FALLBACK - with glyph advances
 417             {
 418                 rOutDev.DrawTextArray( rOutpos, maText.Text, aOffsets.get(),
 419                                        ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
 420                                        ::canvas::tools::numeric_cast<USHORT>(maText.Length) );
 421                 return true;
 422             }
 423             else                                               // VCL FALLBACK - without advances
 424             {
 425                 rOutDev.DrawText( rOutpos, maText.Text,
 426                                   ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
 427                                   ::canvas::tools::numeric_cast<USHORT>(maText.Length) );
 428                 return true;
 429             }
 430         }
 431
 432         if (aSysLayoutData.rGlyphData.empty()) return false; //??? false?
 433
 434         /**
 435          * Setup platform independent glyph vector into cairo-based glyphs vector.
 436          **/
 437
 438         // setup glyphs
 439         std::vector<cairo_glyph_t> cairo_glyphs;
 440         cairo_glyphs.reserve( 256 );
 441
 442         for( int nStart = 0; nStart < (int) aSysLayoutData.rGlyphData.size(); nStart++ )
 443         {
 444             cairo_glyph_t aGlyph;
 445             SystemGlyphData systemGlyph = aSysLayoutData.rGlyphData.at(nStart);
 446             aGlyph.index = systemGlyph.index;
 447 #ifdef CAIRO_HAS_WIN32_SURFACE
 448             // Cairo requires standard glyph indexes (ETO_GLYPH_INDEX), while vcl/win/* uses ucs4 chars.
 449             // Convert to standard indexes
 450             aGlyph.index = cairo::ucs4toindex((unsigned int) aGlyph.index, aSysLayoutData.aSysFontData.hFont);
 451 #endif
 452             aGlyph.x = systemGlyph.x;
 453             aGlyph.y = systemGlyph.y;
 454             cairo_glyphs.push_back(aGlyph);
 455         }
 456
 457         if (cairo_glyphs.empty()) return true;  //true or false??
 458
 459         /**
 460          * Setup font
 461          **/
 462         cairo_font_face_t* font_face = NULL;
 463
 464 #ifdef CAIRO_HAS_QUARTZ_SURFACE
 465         // TODO: use cairo_quartz_font_face_create_for_cgfont(cgFont)
 466         //       when CGFont (Mac OS X 10.5 API) is provided by the AQUA VCL backend.
 467         font_face = cairo_quartz_font_face_create_for_atsu_font_id((ATSUFontID) aSysLayoutData.aSysFontData.aATSUFontID);
 468
 469 #elif defined CAIRO_HAS_WIN32_SURFACE
 470   #if (OSL_DEBUG_LEVEL > 1)
 471         GetObjectW( aSysLayoutData.aSysFontData.hFont, sizeof(logfont), &logfont );
 472   #endif
 473         // Note: cairo library uses logfont fallbacks when lfEscapement, lfOrientation and lfWidth are not zero.
 474         // VCL always has non-zero value for lfWidth
 475         font_face = cairo_win32_font_face_create_for_hfont(aSysLayoutData.aSysFontData.hFont);
 476
 477 #elif defined CAIRO_HAS_XLIB_SURFACE
 478         font_face = cairo_ft_font_face_create_for_ft_face((FT_Face)aSysLayoutData.aSysFontData.nFontId,
 479                                                           aSysLayoutData.aSysFontData.nFontFlags);
 480 #else
 481 # error Native API needed.
 482 #endif
 483
 484         CairoSharedPtr pSCairo = pSurface->getCairo();
 485
 486         cairo_set_font_face( pSCairo.get(), font_face);
 487
 488         // create default font options. cairo_get_font_options() does not retrieve the surface defaults,
 489         // only what has been set before with cairo_set_font_options()
 490         cairo_font_options_t* options = cairo_font_options_create();
 491         if (aSysLayoutData.aSysFontData.bAntialias) {
 492             // CAIRO_ANTIALIAS_GRAY provides more similar result to VCL Canvas,
 493             // so we're not using CAIRO_ANTIALIAS_SUBPIXEL
 494             cairo_font_options_set_antialias(options, CAIRO_ANTIALIAS_GRAY);
 495         }
 496         cairo_set_font_options( pSCairo.get(), options);
 497
 498         // Font color
 499         Color mTextColor = rOutDev.GetTextColor();
 500         cairo_set_source_rgb(pSCairo.get(),
 501                              mTextColor.GetRed()/255.0,
 502                              mTextColor.GetGreen()/255.0,
 503                              mTextColor.GetBlue()/255.0);
 504
 505         // Font rotation and scaling
 506         cairo_matrix_t m;
 507         Font aFont = rOutDev.GetFont();
 508         FontMetric aMetric( rOutDev.GetFontMetric(aFont) );
 509         long nWidth = 0;
 510
 511         // width calculation is deep magic and platform/font dependant.
 512         // width == 0 means no scaling, and usually width == height means the same.
 513         // Other values mean horizontal scaling (narrow or stretching)
 514         // see issue #101566
 515
 516         //proper scale calculation across platforms
 517         if (aFont.GetWidth() == 0) {
 518             nWidth = aFont.GetHeight();
 519         } else {
 520             // any scaling needs to be relative to the platform-dependent definition
 521             // of width of the font
 522             nWidth = aFont.GetHeight() * aFont.GetWidth() / aMetric.GetWidth();
 523         }
 524
 525         cairo_matrix_init_identity(&m);
 526
 527         if (aSysLayoutData.orientation) cairo_matrix_rotate(&m, (3600 - aSysLayoutData.orientation) * M_PI / 1800.0);
 528
 529         cairo_matrix_scale(&m, nWidth, aFont.GetHeight());
 530
 531         //faux italics
 532         if (aSysLayoutData.aSysFontData.bFakeItalic) m.xy = -m.xx * 0x6000L / 0x10000L;
 533
 534         cairo_set_font_matrix(pSCairo.get(), &m);
 535
 536         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",
 537                   aFont.GetWidth(),
 538                   aFont.GetHeight(),
 539                   aMetric.GetWidth(),
 540                   nWidth,
 541                   (int) rOutpos.X(),
 542                   (int) rOutpos.Y(),
 543                   cairo_glyphs[0].index, cairo_glyphs[1].index, cairo_glyphs[2].index,
 544                   maLogicalAdvancements.getLength() ? "ADV " : "",
 545                   aSysLayoutData.aSysFontData.bAntialias ? "AA " : "",
 546                   aSysLayoutData.aSysFontData.bFakeBold ? "FB " : "",
 547                   aSysLayoutData.aSysFontData.bFakeItalic ? "FI " : "",
 548 #if (defined CAIRO_HAS_WIN32_SURFACE) && (OSL_DEBUG_LEVEL > 1)
 549                   ::rtl::OUStringToOString( reinterpret_cast<const sal_Unicode*> (logfont.lfFaceName), RTL_TEXTENCODING_UTF8 ).getStr(),
 550 #else
 551                   ::rtl::OUStringToOString( aFont.GetName(), RTL_TEXTENCODING_UTF8 ).getStr(),
 552 #endif
 553                   ::rtl::OUStringToOString( maText.Text.copy( maText.StartPosition, maText.Length ),
 554                                             RTL_TEXTENCODING_UTF8 ).getStr()
 555             );
 556
 557         cairo_show_glyphs(pSCairo.get(), &cairo_glyphs[0], cairo_glyphs.size());
 558
 559         //faux bold
 560         if (aSysLayoutData.aSysFontData.bFakeBold) {
 561             double bold_dx = 0.5 * sqrt( 0.7 * aFont.GetHeight() );
 562             int total_steps = 2 * ((int) (bold_dx + 0.5));
 563
 564             // loop to draw the text for every half pixel of displacement
 565             for (int nSteps = 0; nSteps < total_steps; nSteps++) {
 566                 for(int nGlyphIdx = 0; nGlyphIdx < (int) cairo_glyphs.size(); nGlyphIdx++) {
 567                     cairo_glyphs[nGlyphIdx].x += bold_dx * nSteps / total_steps;
 568                 }
 569                 cairo_show_glyphs(pSCairo.get(), &cairo_glyphs[0], cairo_glyphs.size());
 570             }
 571             OSL_TRACE(":cairocanvas::TextLayout::draw(S,O,p,v,r): FAKEBOLD - dx:%d", (int) bold_dx);
 572         }
 573
 574         cairo_restore( pSCairo.get() );
 575         cairo_font_face_destroy(font_face);
 576         return true;
 577     }
 578
 579
 580     namespace
 581     {
 582         class OffsetTransformer
 583         {
 584         public:
 585             OffsetTransformer( const ::basegfx::B2DHomMatrix& rMat ) :
 586                 maMatrix( rMat )
 587             {
 588             }
 589
 590             sal_Int32 operator()( const double& rOffset )
 591             {
 592                 // This is an optimization of the normal rMat*[x,0]
 593                 // transformation of the advancement vector (in x
 594                 // direction), followed by a length calculation of the
 595                 // resulting vector: advancement' =
 596                 // ||rMat*[x,0]||. Since advancements are vectors, we
 597                 // can ignore translational components, thus if [x,0],
 598                 // it follows that rMat*[x,0]=[x',0] holds. Thus, we
 599                 // just have to calc the transformation of the x
 600                 // component.
 601
 602                 // TODO(F2): Handle non-horizontal advancements!
 603                 return ::basegfx::fround( hypot(maMatrix.get(0,0)*rOffset,
 604                                                 maMatrix.get(1,0)*rOffset) );
 605             }
 606
 607         private:
 608             ::basegfx::B2DHomMatrix maMatrix;
 609         };
 610     }
 611
 612     void TextLayout::setupTextOffsets( sal_Int32*                                               outputOffsets,
 613                                        const uno::Sequence< double >&   inputOffsets,
 614                                        const rendering::ViewState&              viewState,
 615                                        const rendering::RenderState&    renderState             ) const
 616     {
 617         ENSURE_OR_THROW( outputOffsets!=NULL,
 618                           "TextLayout::setupTextOffsets offsets NULL" );
 619
 620         ::basegfx::B2DHomMatrix aMatrix;
 621
 622         ::canvas::tools::mergeViewAndRenderTransform(aMatrix,
 623                                                      viewState,
 624                                                      renderState);
 625
 626         // fill integer offsets
 627         ::std::transform( const_cast< uno::Sequence< double >& >(inputOffsets).getConstArray(),
 628                           const_cast< uno::Sequence< double >& >(inputOffsets).getConstArray()+inputOffsets.getLength(),
 629                           outputOffsets,
 630                           OffsetTransformer( aMatrix ) );
 631     }
 632
 633 #define SERVICE_NAME "com.sun.star.rendering.TextLayout"
 634 #define IMPLEMENTATION_NAME "CairoCanvas::TextLayout"
 635
 636     ::rtl::OUString SAL_CALL TextLayout::getImplementationName() throw( uno::RuntimeException )
 637     {
 638         return ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( IMPLEMENTATION_NAME ) );
 639     }
 640
 641     sal_Bool SAL_CALL TextLayout::supportsService( const ::rtl::OUString& ServiceName ) throw( uno::RuntimeException )
 642     {
 643         return ServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM ( SERVICE_NAME ) );
 644     }
 645
 646     uno::Sequence< ::rtl::OUString > SAL_CALL TextLayout::getSupportedServiceNames()  throw( uno::RuntimeException )
 647     {
 648         uno::Sequence< ::rtl::OUString > aRet(1);
 649         aRet[0] = ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM ( SERVICE_NAME ) );
 650
 651         return aRet;
 652     }
 653 }