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 #ifdef max
  48 #undef max
  49 #endif
  50 #ifdef min
  51 #undef min
  52 #endif
  53 #endif
  54 #include <vcl/sysdata.hxx>
  55
  56 #include <basegfx/matrix/b2dhommatrix.hxx>
  57 #include <basegfx/numeric/ftools.hxx>
  58
  59 #include <boost/scoped_array.hpp>
  60
  61 #include "cairo_textlayout.hxx"
  62 #include "cairo_spritecanvas.hxx"
  63
  64 #ifdef CAIRO_HAS_QUARTZ_SURFACE
  65 # include "cairo_quartz_cairo.hxx"
  66 #elif defined CAIRO_HAS_WIN32_SURFACE
  67 # include "cairo_win32_cairo.hxx"
  68 # include <cairo-win32.h>
  69 #elif defined CAIRO_HAS_XLIB_SURFACE
  70 # include "cairo_xlib_cairo.hxx"
  71 # include <cairo-ft.h>
  72 #else
  73 # error Native API needed.
  74 #endif
  75
  76 using namespace ::cairo;
  77 using namespace ::com::sun::star;
  78
  79 namespace cairocanvas
  80 {
  81     namespace
  82     {
  83         void setupLayoutMode( OutputDevice& rOutDev,
  84                               sal_Int8          nTextDirection )
  85         {
  86             // TODO(P3): avoid if already correctly set
  87             ULONG nLayoutMode;
  88             switch( nTextDirection )
  89             {
  90                 default:
  91                     nLayoutMode = 0;
  92                     break;
  93                 case rendering::TextDirection::WEAK_LEFT_TO_RIGHT:
  94                     nLayoutMode = TEXT_LAYOUT_BIDI_LTR;
  95                     break;
  96                 case rendering::TextDirection::STRONG_LEFT_TO_RIGHT:
  97                     nLayoutMode = TEXT_LAYOUT_BIDI_LTR | TEXT_LAYOUT_BIDI_STRONG;
  98                     break;
  99                 case rendering::TextDirection::WEAK_RIGHT_TO_LEFT:
 100                     nLayoutMode = TEXT_LAYOUT_BIDI_RTL;
 101                     break;
 102                 case rendering::TextDirection::STRONG_RIGHT_TO_LEFT:
 103                     nLayoutMode = TEXT_LAYOUT_BIDI_RTL | TEXT_LAYOUT_BIDI_STRONG;
 104                     break;
 105             }
 106
 107             // set calculated layout mode. Origin is always the left edge,
 108             // as required at the API spec
 109             rOutDev.SetLayoutMode( nLayoutMode | TEXT_LAYOUT_TEXTORIGIN_LEFT );
 110         }
 111     }
 112
 113     TextLayout::TextLayout( const rendering::StringContext&     aText,
 114                             sal_Int8                            nDirection,
 115                             sal_Int64                           /*nRandomSeed*/,
 116                             const CanvasFont::Reference&        rFont,
 117                             const SurfaceProviderRef&                   rRefDevice ) :
 118         TextLayout_Base( m_aMutex ),
 119         maText( aText ),
 120         maLogicalAdvancements(),
 121         mpFont( rFont ),
 122         mpRefDevice( rRefDevice ),
 123         mnTextDirection( nDirection )
 124     {
 125     }
 126
 127     TextLayout::~TextLayout()
 128     {
 129     }
 130
 131     void SAL_CALL TextLayout::disposing()
 132     {
 133         ::osl::MutexGuard aGuard( m_aMutex );
 134
 135         mpFont.reset();
 136         mpRefDevice.clear();
 137     }
 138
 139     // XTextLayout
 140     uno::Sequence< uno::Reference< rendering::XPolyPolygon2D > > SAL_CALL TextLayout::queryTextShapes(  ) throw (uno::RuntimeException)
 141     {
 142         ::osl::MutexGuard aGuard( m_aMutex );
 143
 144         // TODO
 145         return uno::Sequence< uno::Reference< rendering::XPolyPolygon2D > >();
 146     }
 147
 148     uno::Sequence< geometry::RealRectangle2D > SAL_CALL TextLayout::queryInkMeasures(  ) throw (uno::RuntimeException)
 149     {
 150         ::osl::MutexGuard aGuard( m_aMutex );
 151
 152         // TODO
 153         return uno::Sequence< geometry::RealRectangle2D >();
 154     }
 155
 156     uno::Sequence< geometry::RealRectangle2D > SAL_CALL TextLayout::queryMeasures(  ) throw (uno::RuntimeException)
 157     {
 158         ::osl::MutexGuard aGuard( m_aMutex );
 159
 160         // TODO
 161         return uno::Sequence< geometry::RealRectangle2D >();
 162     }
 163
 164     uno::Sequence< double > SAL_CALL TextLayout::queryLogicalAdvancements(  ) throw (uno::RuntimeException)
 165     {
 166         ::osl::MutexGuard aGuard( m_aMutex );
 167
 168         return maLogicalAdvancements;
 169     }
 170
 171     void SAL_CALL TextLayout::applyLogicalAdvancements( const uno::Sequence< double >& aAdvancements ) throw (lang::IllegalArgumentException, uno::RuntimeException)
 172     {
 173         ::osl::MutexGuard aGuard( m_aMutex );
 174
 175         if( aAdvancements.getLength() != maText.Length )
 176         {
 177             OSL_TRACE( "TextLayout::applyLogicalAdvancements(): mismatching number of advancements" );
 178             throw lang::IllegalArgumentException();
 179         }
 180
 181         maLogicalAdvancements = aAdvancements;
 182     }
 183
 184     geometry::RealRectangle2D SAL_CALL TextLayout::queryTextBounds(  ) throw (uno::RuntimeException)
 185     {
 186         ::osl::MutexGuard aGuard( m_aMutex );
 187
 188         OutputDevice* pOutDev = mpRefDevice->getOutputDevice();
 189         if( !pOutDev )
 190             return geometry::RealRectangle2D();
 191
 192         VirtualDevice aVDev( *pOutDev );
 193         aVDev.SetFont( mpFont->getVCLFont() );
 194
 195         // need metrics for Y offset, the XCanvas always renders
 196         // relative to baseline
 197         const ::FontMetric& aMetric( aVDev.GetFontMetric() );
 198
 199         setupLayoutMode( aVDev, mnTextDirection );
 200
 201         const sal_Int32 nAboveBaseline( -aMetric.GetIntLeading() - aMetric.GetAscent() );
 202         const sal_Int32 nBelowBaseline( aMetric.GetDescent() );
 203
 204         if( maLogicalAdvancements.getLength() )
 205         {
 206             return geometry::RealRectangle2D( 0, nAboveBaseline,
 207                                               maLogicalAdvancements[ maLogicalAdvancements.getLength()-1 ],
 208                                               nBelowBaseline );
 209         }
 210         else
 211         {
 212             return geometry::RealRectangle2D( 0, nAboveBaseline,
 213                                               aVDev.GetTextWidth(
 214                                                   maText.Text,
 215                                                   ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
 216                                                   ::canvas::tools::numeric_cast<USHORT>(maText.Length) ),
 217                                               nBelowBaseline );
 218         }
 219     }
 220
 221     double SAL_CALL TextLayout::justify( double /*nSize*/ ) throw (lang::IllegalArgumentException, uno::RuntimeException)
 222     {
 223         ::osl::MutexGuard aGuard( m_aMutex );
 224
 225         // TODO
 226         return 0.0;
 227     }
 228
 229     double SAL_CALL TextLayout::combinedJustify( const uno::Sequence< uno::Reference< rendering::XTextLayout > >& /*aNextLayouts*/,
 230                                                  double /*nSize*/ ) throw (lang::IllegalArgumentException, uno::RuntimeException)
 231     {
 232         ::osl::MutexGuard aGuard( m_aMutex );
 233
 234         // TODO
 235         return 0.0;
 236     }
 237
 238     rendering::TextHit SAL_CALL TextLayout::getTextHit( const geometry::RealPoint2D& /*aHitPoint*/ ) throw (uno::RuntimeException)
 239     {
 240         ::osl::MutexGuard aGuard( m_aMutex );
 241
 242         // TODO
 243         return rendering::TextHit();
 244     }
 245
 246     rendering::Caret SAL_CALL TextLayout::getCaret( sal_Int32 /*nInsertionIndex*/,
 247                                                     sal_Bool /*bExcludeLigatures*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
 248     {
 249         ::osl::MutexGuard aGuard( m_aMutex );
 250
 251         // TODO
 252         return rendering::Caret();
 253     }
 254
 255     sal_Int32 SAL_CALL TextLayout::getNextInsertionIndex( sal_Int32 /*nStartIndex*/,
 256                                                           sal_Int32 /*nCaretAdvancement*/,
 257                                                           sal_Bool /*bExcludeLigatures*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
 258     {
 259         ::osl::MutexGuard aGuard( m_aMutex );
 260
 261         // TODO
 262         return 0;
 263     }
 264
 265     uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryVisualHighlighting( sal_Int32 /*nStartIndex*/,
 266                                                                                               sal_Int32 /*nEndIndex*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
 267     {
 268         ::osl::MutexGuard aGuard( m_aMutex );
 269
 270         // TODO
 271         return uno::Reference< rendering::XPolyPolygon2D >();
 272     }
 273
 274     uno::Reference< rendering::XPolyPolygon2D > SAL_CALL TextLayout::queryLogicalHighlighting( sal_Int32 /*nStartIndex*/,
 275                                                                                                sal_Int32 /*nEndIndex*/ ) throw (lang::IndexOutOfBoundsException, uno::RuntimeException)
 276     {
 277         ::osl::MutexGuard aGuard( m_aMutex );
 278
 279         // TODO
 280         return uno::Reference< rendering::XPolyPolygon2D >();
 281     }
 282
 283     double SAL_CALL TextLayout::getBaselineOffset(  ) throw (uno::RuntimeException)
 284     {
 285         ::osl::MutexGuard aGuard( m_aMutex );
 286
 287         // TODO
 288         return 0.0;
 289     }
 290
 291     sal_Int8 SAL_CALL TextLayout::getMainTextDirection(  ) throw (uno::RuntimeException)
 292     {
 293         ::osl::MutexGuard aGuard( m_aMutex );
 294
 295         return mnTextDirection;
 296     }
 297
 298     uno::Reference< rendering::XCanvasFont > SAL_CALL TextLayout::getFont(  ) throw (uno::RuntimeException)
 299     {
 300         ::osl::MutexGuard aGuard( m_aMutex );
 301
 302         return mpFont.getRef();
 303     }
 304
 305     rendering::StringContext SAL_CALL TextLayout::getText(  ) throw (uno::RuntimeException)
 306     {
 307         ::osl::MutexGuard aGuard( m_aMutex );
 308
 309         return maText;
 310     }
 311
 312     void TextLayout::useFont( Cairo* pCairo )
 313     {
 314     rendering::FontRequest aFontRequest = mpFont->getFontRequest();
 315     rendering::FontInfo aFontInfo = aFontRequest.FontDescription;
 316
 317     cairo_select_font_face( pCairo, ::rtl::OUStringToOString( aFontInfo.FamilyName, RTL_TEXTENCODING_UTF8 ), CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL );
 318     cairo_set_font_size( pCairo, aFontRequest.CellSize );
 319     }
 320
 321   /** TextLayout:draw
 322    *
 323    * This function uses the "toy" api of the cairo library
 324    *
 325    **/
 326     bool TextLayout::draw( Cairo* pCairo )
 327     {
 328         ::osl::MutexGuard aGuard( m_aMutex );
 329
 330         ::rtl::OUString aSubText = maText.Text.copy( maText.StartPosition, maText.Length );
 331         ::rtl::OString aUTF8String = ::rtl::OUStringToOString( aSubText, RTL_TEXTENCODING_UTF8 );
 332
 333         cairo_save( pCairo );
 334         /* move to 0, 0 as cairo_show_text advances current point and current point is not restored by cairo_restore.
 335            before we were depending on unmodified current point which I believed was preserved by save/restore */
 336         cairo_move_to( pCairo, 0, 0 );
 337         useFont( pCairo );
 338         cairo_show_text( pCairo, aUTF8String );
 339         cairo_restore( pCairo );
 340
 341         return true;
 342     }
 343
 344
 345   /**
 346    * TextLayout::isCairoRenderable
 347    *
 348    * Features currenly not supported by Cairo (VCL rendering is used as fallback):
 349    * - vertical glyphs
 350    *
 351    * @return true, if text/font can be rendered with cairo
 352    **/
 353     bool TextLayout::isCairoRenderable(SystemFontData aSysFontData) const
 354     {
 355 #if defined UNX && !defined QUARTZ
 356         // is font usable?
 357         if (!aSysFontData.nFontId) return false;
 358 #endif
 359
 360         // vertical glyph rendering is not supported in cairo for now
 361         if (aSysFontData.bVerticalCharacterType) {
 362             OSL_TRACE(":cairocanvas::TextLayout::isCairoRenderable(): ***************** VERTICAL CHARACTER STYLE!!! ****************");
 363             return false;
 364         }
 365
 366         return true;
 367     }
 368
 369
 370   /**
 371    * TextLayout::draw
 372    *
 373    * Cairo-based text rendering. Draw text directly on the cairo surface with cairo fonts.
 374    * Avoid using VCL VirtualDevices for that, bypassing VCL DrawText functions, when possible
 375    *
 376    * Note: some text effects are not rendered due to lacking generic canvas or cairo canvas
 377    *       implementation. See issues 92657, 92658, 92659, 92660, 97529
 378    *
 379    * @return true, if successful
 380    **/
 381     bool TextLayout::draw( SurfaceSharedPtr&             pSurface,
 382                            OutputDevice&                 rOutDev,
 383                            const Point&                  rOutpos,
 384                            const rendering::ViewState&   viewState,
 385                            const rendering::RenderState& renderState ) const
 386     {
 387         ::osl::MutexGuard aGuard( m_aMutex );
 388         SystemTextLayoutData aSysLayoutData;
 389 #if (defined CAIRO_HAS_WIN32_SURFACE) && (OSL_DEBUG_LEVEL > 1)
 390         LOGFONTW logfont;
 391 #endif
 392         setupLayoutMode( rOutDev, mnTextDirection );
 393
 394         // TODO(P2): cache that
 395         ::boost::scoped_array< sal_Int32 > aOffsets(new sal_Int32[maLogicalAdvancements.getLength()]);
 396
 397         if( maLogicalAdvancements.getLength() )
 398         {
 399             setupTextOffsets( aOffsets.get(), maLogicalAdvancements, viewState, renderState );
 400
 401             // TODO(F3): ensure correct length and termination for DX
 402             // array (last entry _must_ contain the overall width)
 403         }
 404
 405         aSysLayoutData = rOutDev.GetSysTextLayoutData(rOutpos, maText.Text,
 406                                                       ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
 407                                                       ::canvas::tools::numeric_cast<USHORT>(maText.Length),
 408                                                       maLogicalAdvancements.getLength() ? aOffsets.get() : NULL);
 409
 410         // The ::GetSysTextLayoutData(), i.e. layouting of text to glyphs can change the font being used.
 411         // The fallback checks need to be done after final font is known.
 412         if (!isCairoRenderable(aSysLayoutData.aSysFontData))    // VCL FALLBACKS
 413         {
 414             OSL_TRACE(":cairocanvas::TextLayout::draw(S,O,p,v,r): VCL FALLBACK %s%s%s%s - %s",
 415                       maLogicalAdvancements.getLength() ? "ADV " : "",
 416                       aSysLayoutData.aSysFontData.bAntialias ? "AA " : "",
 417                       aSysLayoutData.aSysFontData.bFakeBold ? "FB " : "",
 418                       aSysLayoutData.aSysFontData.bFakeItalic ? "FI " : "",
 419                       ::rtl::OUStringToOString( maText.Text.copy( maText.StartPosition, maText.Length ),
 420                                                 RTL_TEXTENCODING_UTF8 ).getStr());
 421
 422             if (maLogicalAdvancements.getLength())        // VCL FALLBACK - with glyph advances
 423             {
 424                 rOutDev.DrawTextArray( rOutpos, maText.Text, aOffsets.get(),
 425                                        ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
 426                                        ::canvas::tools::numeric_cast<USHORT>(maText.Length) );
 427                 return true;
 428             }
 429             else                                               // VCL FALLBACK - without advances
 430             {
 431                 rOutDev.DrawText( rOutpos, maText.Text,
 432                                   ::canvas::tools::numeric_cast<USHORT>(maText.StartPosition),
 433                                   ::canvas::tools::numeric_cast<USHORT>(maText.Length) );
 434                 return true;
 435             }
 436         }
 437
 438         if (aSysLayoutData.rGlyphData.empty()) return false; //??? false?
 439
 440         /**
 441          * Setup platform independent glyph vector into cairo-based glyphs vector.
 442          **/
 443
 444         // setup glyphs
 445         std::vector<cairo_glyph_t> cairo_glyphs;
 446         cairo_glyphs.reserve( 256 );
 447
 448         for( int nStart = 0; nStart < (int) aSysLayoutData.rGlyphData.size(); nStart++ )
 449         {
 450             cairo_glyph_t aGlyph;
 451             SystemGlyphData systemGlyph = aSysLayoutData.rGlyphData.at(nStart);
 452             aGlyph.index = systemGlyph.index;
 453 #ifdef CAIRO_HAS_WIN32_SURFACE
 454             // Cairo requires standard glyph indexes (ETO_GLYPH_INDEX), while vcl/win/* uses ucs4 chars.
 455             // Convert to standard indexes
 456             aGlyph.index = cairo::ucs4toindex((unsigned int) aGlyph.index, aSysLayoutData.aSysFontData.hFont);
 457 #endif
 458             aGlyph.x = systemGlyph.x;
 459             aGlyph.y = systemGlyph.y;
 460             cairo_glyphs.push_back(aGlyph);
 461         }
 462
 463         if (cairo_glyphs.empty()) return true;  //true or false??
 464
 465         /**
 466          * Setup font
 467          **/
 468         cairo_font_face_t* font_face = NULL;
 469
 470 #ifdef CAIRO_HAS_QUARTZ_SURFACE
 471         // TODO: use cairo_quartz_font_face_create_for_cgfont(cgFont)
 472         //       when CGFont (Mac OS X 10.5 API) is provided by the AQUA VCL backend.
 473         font_face = cairo_quartz_font_face_create_for_atsu_font_id((ATSUFontID) aSysLayoutData.aSysFontData.aATSUFontID);
 474
 475 #elif defined CAIRO_HAS_WIN32_SURFACE
 476   #if (OSL_DEBUG_LEVEL > 1)
 477         GetObjectW( aSysLayoutData.aSysFontData.hFont, sizeof(logfont), &logfont );
 478   #endif
 479         // Note: cairo library uses logfont fallbacks when lfEscapement, lfOrientation and lfWidth are not zero.
 480         // VCL always has non-zero value for lfWidth
 481         font_face = cairo_win32_font_face_create_for_hfont(aSysLayoutData.aSysFontData.hFont);
 482
 483 #elif defined CAIRO_HAS_XLIB_SURFACE
 484         font_face = cairo_ft_font_face_create_for_ft_face((FT_Face)aSysLayoutData.aSysFontData.nFontId,
 485                                                           aSysLayoutData.aSysFontData.nFontFlags);
 486 #else
 487 # error Native API needed.
 488 #endif
 489
 490         CairoSharedPtr pSCairo = pSurface->getCairo();
 491
 492         cairo_set_font_face( pSCairo.get(), font_face);
 493
 494         // create default font options. cairo_get_font_options() does not retrieve the surface defaults,
 495         // only what has been set before with cairo_set_font_options()
 496         cairo_font_options_t* options = cairo_font_options_create();
 497         if (aSysLayoutData.aSysFontData.bAntialias) {
 498             // CAIRO_ANTIALIAS_GRAY provides more similar result to VCL Canvas,
 499             // so we're not using CAIRO_ANTIALIAS_SUBPIXEL
 500             cairo_font_options_set_antialias(options, CAIRO_ANTIALIAS_GRAY);
 501         }
 502         cairo_set_font_options( pSCairo.get(), options);
 503
 504         // Font color
 505         Color mTextColor = rOutDev.GetTextColor();
 506         cairo_set_source_rgb(pSCairo.get(),
 507                              mTextColor.GetRed()/255.0,
 508                              mTextColor.GetGreen()/255.0,
 509                              mTextColor.GetBlue()/255.0);
 510
 511         // Font rotation and scaling
 512         cairo_matrix_t m;
 513         Font aFont = rOutDev.GetFont();
 514         FontMetric aMetric( rOutDev.GetFontMetric(aFont) );
 515         long nWidth = 0;
 516
 517         // width calculation is deep magic and platform/font dependant.
 518         // width == 0 means no scaling, and usually width == height means the same.
 519         // Other values mean horizontal scaling (narrow or stretching)
 520         // see issue #101566
 521
 522         //proper scale calculation across platforms
 523         if (aFont.GetWidth() == 0) {
 524             nWidth = aFont.GetHeight();
 525         } else {
 526             // any scaling needs to be relative to the platform-dependent definition
 527             // of width of the font
 528             nWidth = aFont.GetHeight() * aFont.GetWidth() / aMetric.GetWidth();
 529         }
 530
 531         cairo_matrix_init_identity(&m);
 532
 533         if (aSysLayoutData.orientation) cairo_matrix_rotate(&m, (3600 - aSysLayoutData.orientation) * M_PI / 1800.0);
 534
 535         cairo_matrix_scale(&m, nWidth, aFont.GetHeight());
 536
 537         //faux italics
 538         if (aSysLayoutData.aSysFontData.bFakeItalic) m.xy = -m.xx * 0x6000L / 0x10000L;
 539
 540         cairo_set_font_matrix(pSCairo.get(), &m);
 541
 542         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",
 543                   aFont.GetWidth(),
 544                   aFont.GetHeight(),
 545                   aMetric.GetWidth(),
 546                   nWidth,
 547                   (int) rOutpos.X(),
 548                   (int) rOutpos.Y(),
 549                   cairo_glyphs[0].index, cairo_glyphs[1].index, cairo_glyphs[2].index,
 550                   maLogicalAdvancements.getLength() ? "ADV " : "",
 551                   aSysLayoutData.aSysFontData.bAntialias ? "AA " : "",
 552                   aSysLayoutData.aSysFontData.bFakeBold ? "FB " : "",
 553                   aSysLayoutData.aSysFontData.bFakeItalic ? "FI " : "",
 554 #if (defined CAIRO_HAS_WIN32_SURFACE) && (OSL_DEBUG_LEVEL > 1)
 555                   ::rtl::OUStringToOString( reinterpret_cast<const sal_Unicode*> (logfont.lfFaceName), RTL_TEXTENCODING_UTF8 ).getStr(),
 556 #else
 557                   ::rtl::OUStringToOString( aFont.GetName(), RTL_TEXTENCODING_UTF8 ).getStr(),
 558 #endif
 559                   ::rtl::OUStringToOString( maText.Text.copy( maText.StartPosition, maText.Length ),
 560                                             RTL_TEXTENCODING_UTF8 ).getStr()
 561             );
 562
 563         cairo_show_glyphs(pSCairo.get(), &cairo_glyphs[0], cairo_glyphs.size());
 564
 565         //faux bold
 566         if (aSysLayoutData.aSysFontData.bFakeBold) {
 567             double bold_dx = 0.5 * sqrt( 0.7 * aFont.GetHeight() );
 568             int total_steps = 2 * ((int) (bold_dx + 0.5));
 569
 570             // loop to draw the text for every half pixel of displacement
 571             for (int nSteps = 0; nSteps < total_steps; nSteps++) {
 572                 for(int nGlyphIdx = 0; nGlyphIdx < (int) cairo_glyphs.size(); nGlyphIdx++) {
 573                     cairo_glyphs[nGlyphIdx].x += bold_dx * nSteps / total_steps;
 574                 }
 575                 cairo_show_glyphs(pSCairo.get(), &cairo_glyphs[0], cairo_glyphs.size());
 576             }
 577             OSL_TRACE(":cairocanvas::TextLayout::draw(S,O,p,v,r): FAKEBOLD - dx:%d", (int) bold_dx);
 578         }
 579
 580         cairo_restore( pSCairo.get() );
 581         cairo_font_face_destroy(font_face);
 582         return true;
 583     }
 584
 585
 586     namespace
 587     {
 588         class OffsetTransformer
 589         {
 590         public:
 591             OffsetTransformer( const ::basegfx::B2DHomMatrix& rMat ) :
 592                 maMatrix( rMat )
 593             {
 594             }
 595
 596             sal_Int32 operator()( const double& rOffset )
 597             {
 598                 // This is an optimization of the normal rMat*[x,0]
 599                 // transformation of the advancement vector (in x
 600                 // direction), followed by a length calculation of the
 601                 // resulting vector: advancement' =
 602                 // ||rMat*[x,0]||. Since advancements are vectors, we
 603                 // can ignore translational components, thus if [x,0],
 604                 // it follows that rMat*[x,0]=[x',0] holds. Thus, we
 605                 // just have to calc the transformation of the x
 606                 // component.
 607
 608                 // TODO(F2): Handle non-horizontal advancements!
 609                 return ::basegfx::fround( hypot(maMatrix.get(0,0)*rOffset,
 610                                                 maMatrix.get(1,0)*rOffset) );
 611             }
 612
 613         private:
 614             ::basegfx::B2DHomMatrix maMatrix;
 615         };
 616     }
 617
 618     void TextLayout::setupTextOffsets( sal_Int32*                                               outputOffsets,
 619                                        const uno::Sequence< double >&   inputOffsets,
 620                                        const rendering::ViewState&              viewState,
 621                                        const rendering::RenderState&    renderState             ) const
 622     {
 623         ENSURE_OR_THROW( outputOffsets!=NULL,
 624                           "TextLayout::setupTextOffsets offsets NULL" );
 625
 626         ::basegfx::B2DHomMatrix aMatrix;
 627
 628         ::canvas::tools::mergeViewAndRenderTransform(aMatrix,
 629                                                      viewState,
 630                                                      renderState);
 631
 632         // fill integer offsets
 633         ::std::transform( const_cast< uno::Sequence< double >& >(inputOffsets).getConstArray(),
 634                           const_cast< uno::Sequence< double >& >(inputOffsets).getConstArray()+inputOffsets.getLength(),
 635                           outputOffsets,
 636                           OffsetTransformer( aMatrix ) );
 637     }
 638
 639 #define SERVICE_NAME "com.sun.star.rendering.TextLayout"
 640 #define IMPLEMENTATION_NAME "CairoCanvas::TextLayout"
 641
 642     ::rtl::OUString SAL_CALL TextLayout::getImplementationName() throw( uno::RuntimeException )
 643     {
 644         return ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( IMPLEMENTATION_NAME ) );
 645     }
 646
 647     sal_Bool SAL_CALL TextLayout::supportsService( const ::rtl::OUString& ServiceName ) throw( uno::RuntimeException )
 648     {
 649         return ServiceName.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM ( SERVICE_NAME ) );
 650     }
 651
 652     uno::Sequence< ::rtl::OUString > SAL_CALL TextLayout::getSupportedServiceNames()  throw( uno::RuntimeException )
 653     {
 654         uno::Sequence< ::rtl::OUString > aRet(1);
 655         aRet[0] = ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM ( SERVICE_NAME ) );
 656
 657         return aRet;
 658     }
 659 }