LibreOffice Module canvas (master)  1
cairo_spritecanvashelper.cxx
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19 
20 #include <sal/config.h>
21 #include <sal/log.hxx>
22 
23 #include <boost/cast.hpp>
24 
26 #include <tools/diagnose_ex.h>
27 
28 #include <canvas/canvastools.hxx>
29 
30 #include <cairo.h>
31 
34 
35 using namespace ::cairo;
36 using namespace ::com::sun::star;
37 
38 namespace cairocanvas
39 {
40  namespace
41  {
47  void spriteRedraw( const CairoSharedPtr& pCairo,
48  const ::canvas::Sprite::Reference& rSprite )
49  {
50  // downcast to derived cairocanvas::Sprite interface, which
51  // provides the actual redraw methods.
52  ::boost::polymorphic_downcast< Sprite* >(rSprite.get())->redraw( pCairo, true);
53  }
54 
55  void repaintBackground( const CairoSharedPtr& pCairo,
56  const SurfaceSharedPtr& pBackgroundSurface,
57  const ::basegfx::B2DRange& rArea )
58  {
59  cairo_save( pCairo.get() );
60  cairo_rectangle( pCairo.get(), ceil( rArea.getMinX() ), ceil( rArea.getMinY() ),
61  floor( rArea.getWidth() ), floor( rArea.getHeight() ) );
62  cairo_clip( pCairo.get() );
63  cairo_set_source_surface( pCairo.get(), pBackgroundSurface->getCairoSurface().get(), 0, 0 );
64  cairo_set_operator( pCairo.get(), CAIRO_OPERATOR_SOURCE );
65  cairo_paint( pCairo.get() );
66  cairo_restore( pCairo.get() );
67  }
68 
69  void opaqueUpdateSpriteArea( const ::canvas::Sprite::Reference& rSprite,
70  const CairoSharedPtr& pCairo,
71  const ::basegfx::B2IRange& rArea )
72  {
73  // clip output to actual update region (otherwise a)
74  // wouldn't save much render time, and b) will clutter
75  // scrolled sprite content outside this area)
76  cairo_save( pCairo.get() );
77  cairo_rectangle( pCairo.get(), rArea.getMinX(), rArea.getMinY(),
78  sal::static_int_cast<sal_Int32>(rArea.getWidth()),
79  sal::static_int_cast<sal_Int32>(rArea.getHeight()) );
80  cairo_clip( pCairo.get() );
81 
82  // repaint affected sprite directly to output device (at
83  // the actual screen output position)
84  // rendering directly to device buffer
85  ::boost::polymorphic_downcast< Sprite* >( rSprite.get() )->redraw( pCairo, false );
86 
87  cairo_restore( pCairo.get() );
88  }
89  }
90 
92  mpRedrawManager( nullptr ),
93  mpOwningSpriteCanvas( nullptr ),
94  mbCompositingSurfaceDirty(true)
95  {
96  }
97 
99  SpriteCanvas& rDevice,
100  const ::basegfx::B2ISize& rSize )
101  {
102  mpRedrawManager = &rManager;
103  mpOwningSpriteCanvas = &rDevice;
104 
105  CanvasHelper::init( rSize, rDevice, &rDevice );
106  }
107 
109  {
110  mpCompositingSurface.reset();
111  mpOwningSpriteCanvas = nullptr;
112  mpRedrawManager = nullptr;
113 
114  // forward to base
116  }
117 
118  uno::Reference< rendering::XAnimatedSprite > SpriteCanvasHelper::createSpriteFromAnimation(
119  const uno::Reference< rendering::XAnimation >& )
120  {
121  return uno::Reference< rendering::XAnimatedSprite >();
122  }
123 
124  uno::Reference< rendering::XAnimatedSprite > SpriteCanvasHelper::createSpriteFromBitmaps(
125  const uno::Sequence< uno::Reference< rendering::XBitmap > >& /*animationBitmaps*/,
126  sal_Int8 /*interpolationMode*/ )
127  {
128  return uno::Reference< rendering::XAnimatedSprite >();
129  }
130 
131  uno::Reference< rendering::XCustomSprite > SpriteCanvasHelper::createCustomSprite( const geometry::RealSize2D& spriteSize )
132  {
133  if( !mpRedrawManager )
134  return uno::Reference< rendering::XCustomSprite >(); // we're disposed
135 
136  return uno::Reference< rendering::XCustomSprite >(
137  new CanvasCustomSprite( spriteSize,
139  }
140 
141  uno::Reference< rendering::XSprite > SpriteCanvasHelper::createClonedSprite(
142  const uno::Reference< rendering::XSprite >& )
143  {
144  return uno::Reference< rendering::XSprite >();
145  }
146 
147  bool SpriteCanvasHelper::updateScreen( const ::basegfx::B2IRange& /*rCurrArea*/,
148  bool bUpdateAll,
149  bool& io_bSurfaceDirty )
150  {
151  if( !mpRedrawManager ||
155  {
156  return false; // disposed, or otherwise dysfunctional
157  }
158 
159  SAL_INFO("canvas.cairo", "SpriteCanvasHelper::updateScreen called");
160 
161  const ::basegfx::B2ISize& rSize = mpOwningSpriteCanvas->getSizePixel();
162 
163  // force compositing surface to be available before using it
164  // inside forEachSpriteArea
165  SurfaceSharedPtr pCompositingSurface = getCompositingSurface(rSize);
167  CairoSharedPtr pCompositingCairo = pCompositingSurface->getCairo();
168  CairoSharedPtr pWindowCairo = pWindowSurface->getCairo();
169 
170  // TODO(P1): Might be worthwhile to track areas of background
171  // changes, too.
172  if( !bUpdateAll && !io_bSurfaceDirty && !mbCompositingSurfaceDirty )
173  {
174  // background has not changed, so we're free to optimize
175  // repaint to areas where a sprite has changed
176 
177  // process each independent area of overlapping sprites
178  // separately.
180  }
181  else
182  {
183  SAL_INFO("canvas.cairo", "SpriteCanvasHelper::updateScreen update ALL");
184 
185  // background has changed, so we currently have no choice
186  // but repaint everything (or caller requested that)
187 
188  cairo_rectangle( pCompositingCairo.get(), 0, 0, rSize.getX(), rSize.getY() );
189  cairo_clip( pCompositingCairo.get() );
190  cairo_save( pCompositingCairo.get() );
191  cairo_set_source_surface( pCompositingCairo.get(),
192  mpOwningSpriteCanvas->getBufferSurface()->getCairoSurface().get(),
193  0, 0 );
194  cairo_set_operator( pCompositingCairo.get(), CAIRO_OPERATOR_SOURCE );
195  cairo_paint( pCompositingCairo.get() );
196  cairo_restore( pCompositingCairo.get() );
197 
198  // repaint all active sprites on top of background into
199  // VDev.
201  [&pCompositingCairo]( const Sprite::Reference rSprite )
202  { spriteRedraw( pCompositingCairo, rSprite ); }
203  );
204 
205  // flush to screen
206  cairo_rectangle( pWindowCairo.get(), 0, 0, rSize.getX(), rSize.getY() );
207  cairo_clip( pWindowCairo.get() );
208  cairo_set_source_surface( pWindowCairo.get(),
209  pCompositingSurface->getCairoSurface().get(),
210  0, 0 );
211  cairo_set_operator( pWindowCairo.get(), CAIRO_OPERATOR_SOURCE );
212  cairo_paint( pWindowCairo.get() );
213  }
214 
215  // change record vector must be cleared, for the next turn of
216  // rendering and sprite changing
218 
220  io_bSurfaceDirty = false;
221 
222  // commit to screen
224 
225  return true;
226  }
227 
228  void SpriteCanvasHelper::backgroundPaint( const ::basegfx::B2DRange& rUpdateRect )
229  {
231  repaintBackground( mpCompositingSurface->getCairo(),
233  rUpdateRect );
234  }
235 
236  void SpriteCanvasHelper::scrollUpdate( const ::basegfx::B2DRange& rMoveStart,
237  const ::basegfx::B2DRange& rMoveEnd,
238  const ::canvas::SpriteRedrawManager::UpdateArea& rUpdateArea )
239  {
242  "SpriteCanvasHelper::scrollUpdate(): NULL device pointer " );
243 
244  SAL_INFO("canvas.cairo", "SpriteCanvasHelper::scrollUpdate called");
245 
246  const ::basegfx::B2ISize& rSize = mpOwningSpriteCanvas->getSizePixel();
247  const ::basegfx::B2IRange aOutputBounds( 0,0,
248  rSize.getX(),
249  rSize.getY() );
250 
251  SurfaceSharedPtr pCompositingSurface = getCompositingSurface(rSize);
253  CairoSharedPtr pCompositingCairo = pCompositingSurface->getCairo();
254  CairoSharedPtr pWindowCairo = pWindowSurface->getCairo();
255 
256  // round rectangles to integer pixel. Note: have to be
257  // extremely careful here, to avoid off-by-one errors for
258  // the destination area: otherwise, the next scroll update
259  // would copy pixel that are not supposed to be part of
260  // the sprite.
261  ::basegfx::B2IRange aSourceRect(
263  const ::basegfx::B2IRange& rDestRect(
265  ::basegfx::B2IPoint aDestPos( rDestRect.getMinimum() );
266 
267  std::vector< ::basegfx::B2IRange > aUnscrollableAreas;
268 
269  // TODO(E3): This is plain buggy (but copies the behaviour of
270  // the old Impress slideshow) - the scrolled area might
271  // actually lie _below_ another window!
272 
273  // clip to output bounds (cannot properly scroll stuff
274  // _outside_ our screen area)
275  if( !::canvas::tools::clipScrollArea( aSourceRect,
276  aDestPos,
277  aUnscrollableAreas,
278  aOutputBounds ) )
279  {
280  // fully clipped scroll area: cannot simply scroll
281  // then. Perform normal opaque update (can use that, since
282  // one of the preconditions for scrollable update is
283  // opaque sprite content)
284 
285  // repaint all affected sprites directly to output device
286  for( const auto& rComponent : rUpdateArea.maComponentList )
287  {
288  const ::canvas::Sprite::Reference& rSprite( rComponent.second.getSprite() );
289  if( rSprite.is() )
290  ::boost::polymorphic_downcast< Sprite* >( rSprite.get() )->redraw(
291  pCompositingCairo, true );
292  }
293  }
294  else
295  {
296  const ::basegfx::B2IVector aSourceUpperLeftPos( aSourceRect.getMinimum() );
297 
298  // clip dest area (which must be inside rDestBounds)
299  ::basegfx::B2IRange aDestRect( rDestRect );
300  aDestRect.intersect( aOutputBounds );
301 
302  ::basegfx::B2ISize aScrollSize( aDestRect.getWidth(), aDestRect.getHeight() );
303  SurfaceSharedPtr pScrollSurface( getTemporarySurface() );
304  CairoSharedPtr pScrollCairo( pScrollSurface->getCairo() );
305 
306  cairo_save( pScrollCairo.get() );
307  // scroll the current content of the compositing surface (and,
308  // thus, of the window) in temp. surface
309  cairo_set_source_surface( pScrollCairo.get(),
310  pCompositingSurface->getCairoSurface().get(),
311  aDestPos.getX() - aSourceUpperLeftPos.getX(),
312  aDestPos.getY() - aSourceUpperLeftPos.getY() );
313  cairo_rectangle( pScrollCairo.get(),
314  aDestPos.getX(), aDestPos.getY(),
315  aScrollSize.getX(), aScrollSize.getY() );
316  cairo_clip( pScrollCairo.get() );
317  cairo_set_operator( pScrollCairo.get(), CAIRO_OPERATOR_SOURCE );
318  cairo_paint( pScrollCairo.get() );
319  cairo_restore( pScrollCairo.get() );
320 
321  cairo_save( pCompositingCairo.get() );
322  // copy the scrolled area back onto the compositing surface
323  cairo_set_source_surface( pCompositingCairo.get(),
324  pScrollSurface->getCairoSurface().get(),
325  0, 0 );
326  cairo_rectangle( pCompositingCairo.get(),
327  aDestPos.getX(), aDestPos.getY(),
328  aScrollSize.getX(), aScrollSize.getY() );
329  cairo_clip( pCompositingCairo.get() );
330  cairo_set_operator( pCompositingCairo.get(), CAIRO_OPERATOR_SOURCE );
331  cairo_paint( pCompositingCairo.get() );
332  cairo_restore( pCompositingCairo.get() );
333 
334  const ::canvas::SpriteRedrawManager::SpriteConnectedRanges::ComponentListType::const_iterator
335  aFirst( rUpdateArea.maComponentList.begin() );
336  ::canvas::SpriteRedrawManager::SpriteConnectedRanges::ComponentListType::const_iterator
337  aSecond( aFirst );
338  ++aSecond;
339 
340  ENSURE_OR_THROW( aFirst->second.getSprite().is(),
341  "VCLCanvas::scrollUpdate(): no sprite" );
342 
343  // repaint uncovered areas from sprite. Need to actually
344  // clip here, since we're only repainting _parts_ of the
345  // sprite
346  for( const auto& rArea : aUnscrollableAreas )
347  opaqueUpdateSpriteArea( aFirst->second.getSprite(),
348  pCompositingCairo, rArea );
349  }
350 
351  // repaint uncovered areas from backbuffer - take the
352  // _rounded_ rectangles from above, to have the update
353  // consistent with the scroll above.
354  std::vector< ::basegfx::B2DRange > aUncoveredAreas;
355  ::basegfx::computeSetDifference( aUncoveredAreas,
356  rUpdateArea.maTotalBounds,
357  ::basegfx::B2DRange( rDestRect ) );
358  for( const auto& rArea : aUncoveredAreas )
359  repaintBackground( pCompositingCairo,
361 
362  cairo_rectangle( pWindowCairo.get(), 0, 0, rSize.getX(), rSize.getY() );
363  cairo_clip( pWindowCairo.get() );
364  cairo_set_source_surface( pWindowCairo.get(),
365  pCompositingSurface->getCairoSurface().get(),
366  0, 0 );
367  cairo_set_operator( pWindowCairo.get(), CAIRO_OPERATOR_SOURCE );
368  cairo_paint( pWindowCairo.get() );
369  }
370 
371  void SpriteCanvasHelper::opaqueUpdate( const ::basegfx::B2DRange& rTotalArea,
372  const std::vector< ::canvas::Sprite::Reference >& rSortedUpdateSprites )
373  {
376  "SpriteCanvasHelper::opaqueUpdate(): NULL device pointer " );
377 
378  SAL_INFO("canvas.cairo", "SpriteCanvasHelper::opaqueUpdate called");
379 
380  const ::basegfx::B2ISize& rDeviceSize = mpOwningSpriteCanvas->getSizePixel();
381 
382  SurfaceSharedPtr pCompositingSurface = getCompositingSurface(rDeviceSize);
384  CairoSharedPtr pCompositingCairo = pCompositingSurface->getCairo();
385  CairoSharedPtr pWindowCairo = pWindowSurface->getCairo();
386 
387  cairo_rectangle( pCompositingCairo.get(), 0, 0, rDeviceSize.getX(), rDeviceSize.getY() );
388  cairo_clip( pCompositingCairo.get() );
389 
390  ::basegfx::B2DVector aPos( ceil( rTotalArea.getMinX() ), ceil( rTotalArea.getMinY() ) );
391  ::basegfx::B2DVector aSize( floor( rTotalArea.getMaxX() - aPos.getX() ), floor( rTotalArea.getMaxY() - aPos.getY() ) );
392 
393  cairo_rectangle( pCompositingCairo.get(), aPos.getX(), aPos.getY(), aSize.getX(), aSize.getY() );
394  cairo_clip( pCompositingCairo.get() );
395 
396  // repaint all affected sprites directly to output device
397  for( const auto& rSprite : rSortedUpdateSprites )
398  {
399  if( rSprite.is() )
400  ::boost::polymorphic_downcast< Sprite* >( rSprite.get() )->redraw(
401  pCompositingCairo, false );
402  }
403 
404  // flush to screen
405  cairo_rectangle( pWindowCairo.get(), 0, 0, rDeviceSize.getX(), rDeviceSize.getY() );
406  cairo_clip( pWindowCairo.get() );
407  cairo_rectangle( pWindowCairo.get(), aPos.getX(), aPos.getY(), aSize.getX(), aSize.getY() );
408  cairo_clip( pWindowCairo.get() );
409  cairo_set_source_surface( pWindowCairo.get(),
410  pCompositingSurface->getCairoSurface().get(),
411  0, 0 );
412  cairo_set_operator( pWindowCairo.get(), CAIRO_OPERATOR_SOURCE );
413  cairo_paint( pWindowCairo.get() );
414  }
415 
416  void SpriteCanvasHelper::genericUpdate( const ::basegfx::B2DRange& rRequestedArea,
417  const std::vector< ::canvas::Sprite::Reference >& rSortedUpdateSprites )
418  {
419  // TODO
420  SAL_INFO("canvas.cairo", "SpriteCanvasHelper::genericUpdate called");
421 
424  "SpriteCanvasHelper::genericUpdate(): NULL device pointer " );
425 
426  // limit size of update VDev to target outdev's size
427  const ::basegfx::B2ISize& rSize = mpOwningSpriteCanvas->getSizePixel();
428 
429  SurfaceSharedPtr pCompositingSurface = getCompositingSurface(rSize);
431  CairoSharedPtr pCompositingCairo = pCompositingSurface->getCairo();
432  CairoSharedPtr pWindowCairo = pWindowSurface->getCairo();
433 
434  // round output position towards zero. Don't want to truncate
435  // a fraction of a sprite pixel... Clip position at origin,
436  // otherwise, truncation of size below might leave visible
437  // areas uncovered by VDev.
438  const Point aOutputPosition(
439  std::max( sal_Int32( 0 ),
440  static_cast< sal_Int32 >(rRequestedArea.getMinX()) ),
441  std::max( sal_Int32( 0 ),
442  static_cast< sal_Int32 >(rRequestedArea.getMinY()) ) );
443  // round output size towards +infty. Don't want to truncate a
444  // fraction of a sprite pixel... Limit size of VDev to output
445  // device's area.
446  const Size aOutputSize(
447  std::min( rSize.getX(),
448  ::canvas::tools::roundUp( rRequestedArea.getMaxX() - aOutputPosition.X()) ),
449  std::min( rSize.getY(),
450  ::canvas::tools::roundUp( rRequestedArea.getMaxY() - aOutputPosition.Y()) ) );
451 
452  cairo_rectangle( pCompositingCairo.get(), aOutputPosition.X(), aOutputPosition.Y(), aOutputSize.Width(), aOutputSize.Height() );
453  cairo_clip( pCompositingCairo.get() );
454 
455  // paint background
456  cairo_save( pCompositingCairo.get() );
457  cairo_set_source_surface( pCompositingCairo.get(),
458  mpOwningSpriteCanvas->getBufferSurface()->getCairoSurface().get(),
459  0, 0 );
460  cairo_set_operator( pCompositingCairo.get(), CAIRO_OPERATOR_SOURCE );
461  cairo_paint( pCompositingCairo.get() );
462  cairo_restore( pCompositingCairo.get() );
463 
464  // repaint all affected sprites on top of background into
465  // VDev.
466  for( const auto& rSprite : rSortedUpdateSprites )
467  {
468  if( rSprite.is() )
469  ::boost::polymorphic_downcast< Sprite* >( rSprite.get() )->redraw(
470  pCompositingCairo, true );
471  }
472 
473  // flush to screen
474  cairo_rectangle( pWindowCairo.get(), aOutputPosition.X(), aOutputPosition.Y(), aOutputSize.Width(), aOutputSize.Height() );
475  cairo_clip( pWindowCairo.get() );
476  cairo_set_source_surface( pWindowCairo.get(),
477  pCompositingSurface->getCairoSurface().get(),
478  0, 0 );
479  cairo_set_operator( pWindowCairo.get(), CAIRO_OPERATOR_SOURCE );
480  cairo_paint( pWindowCairo.get() );
481  }
482 
483  ::cairo::SurfaceSharedPtr const & SpriteCanvasHelper::getCompositingSurface( const ::basegfx::B2ISize& rNeededSize )
484  {
485  if( rNeededSize.getX() > maCompositingSurfaceSize.getX() ||
486  rNeededSize.getY() > maCompositingSurfaceSize.getY() )
487  {
488  // need to give buffer more size
489  mpCompositingSurface.reset();
490  }
491 
492  if( !mpCompositingSurface )
493  {
494  mpCompositingSurface = createSurface( rNeededSize );
495  maCompositingSurfaceSize = rNeededSize;
497  mpTemporarySurface.reset();
498  }
499 
500  return mpCompositingSurface;
501  }
502 
504  {
505  if ( !mpTemporarySurface )
507  return mpTemporarySurface;
508  }
509 
510  ::cairo::SurfaceSharedPtr SpriteCanvasHelper::createSurface( const ::basegfx::B2ISize& rNeededSize ) const
511  {
512  return mpOwningSpriteCanvas->getWindowSurface()->getSimilar(
513  CAIRO_CONTENT_COLOR,
514  rNeededSize.getX(), rNeededSize.getY() );
515  }
516 }
517 
518 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
double getY() const
void clearChangeRecords()
Clear sprite change records (typically directly after a screen update)
void backgroundPaint(const ::basegfx::B2DRange &rUpdateRect)
Gets called for simple background repaints.
void forEachSpriteArea(Functor &rFunc) const
Call given functor for each sprite area that needs an update.
signed char sal_Int8
#define max(a, b)
Definition: dx_winstuff.hxx:43
const ::basegfx::B2ISize & getSizePixel() const
css::uno::Reference< css::rendering::XAnimatedSprite > createSpriteFromAnimation(const css::uno::Reference< css::rendering::XAnimation > &animation)
css::uno::Reference< css::rendering::XCustomSprite > createCustomSprite(const css::geometry::RealSize2D &spriteSize)
void opaqueUpdate(const ::basegfx::B2DRange &rTotalArea, const std::vector< ::canvas::Sprite::Reference > &rSortedUpdateSprites)
void genericUpdate(const ::basegfx::B2DRange &rTotalArea, const std::vector< ::canvas::Sprite::Reference > &rSortedUpdateSprites)
void disposing()
Release all references.
::cairo::SurfaceSharedPtr mpCompositingSurface
a surface used to composite the frontbuffer image
std::shared_ptr< cairo_t > CairoSharedPtr
This class manages smooth SpriteCanvas updates.
::basegfx::B2IRange spritePixelAreaFromB2DRange(const ::basegfx::B2DRange &rRange)
Clip a blit between two differently surfaces.
css::uno::Reference< css::rendering::XSprite > createClonedSprite(const css::uno::Reference< css::rendering::XSprite > &original)
bool updateScreen(const ::basegfx::B2IRange &rCurrArea, bool bUpdateAll, bool &io_bSurfaceDirty)
Actually perform the screen update.
std::shared_ptr< Surface > SurfaceSharedPtr
::canvas::SpriteRedrawManager * mpRedrawManager
Set from the SpriteCanvas: instance coordinating sprite redraw.
B2IPoint getMinimum() const
::cairo::SurfaceSharedPtr const & getCompositingSurface(const ::basegfx::B2ISize &rNeededSize)
void init(::canvas::SpriteRedrawManager &rManager, SpriteCanvas &rOwningSpriteCanvas, const ::basegfx::B2ISize &rSize)
void forEachSprite(const Functor &rFunc) const
Call given functor for each active sprite.
void scrollUpdate(const ::basegfx::B2DRange &rMoveStart, const ::basegfx::B2DRange &rMoveEnd, const ::canvas::SpriteRedrawManager::UpdateArea &rUpdateArea)
Gets called when area can be handled by scrolling.
::cairo::SurfaceSharedPtr const & getWindowSurface() const
#define ENSURE_OR_THROW(c, m)
Product of this component's factory.
void init(const ::basegfx::B2ISize &rSizePixel, SurfaceProvider &rSurfaceProvider, css::rendering::XGraphicDevice *pDevice)
Initialize canvas helper.
::cairo::SurfaceSharedPtr createSurface(const ::basegfx::B2ISize &rNeededSize) const
#define SAL_INFO(area, stream)
css::uno::Reference< css::rendering::XAnimatedSprite > createSpriteFromBitmaps(const css::uno::Sequence< css::uno::Reference< css::rendering::XBitmap > > &animationBitmaps, sal_Int8 interpolationMode)
bool clipScrollArea(::basegfx::B2IRange &io_rSourceArea,::basegfx::B2IPoint &io_rDestPoint, std::vector< ::basegfx::B2IRange > &o_ClippedAreas, const ::basegfx::B2IRange &rBounds)
SpriteCanvas * mpOwningSpriteCanvas
Set from the init method. used to generate sprites.
double getX() const
::cairo::SurfaceSharedPtr mpTemporarySurface
a temporary surface that is guaranteed to be the same size
::cairo::SurfaceSharedPtr const & getTemporarySurface()
void disposing()
Dispose all internal references.
::cairo::SurfaceSharedPtr const & getBufferSurface() const