dali/internal/event/events/hit-test-algorithm-impl.cpp

   1 /*
   2  * Copyright (c) 2022 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 // CLASS HEADER
  19 #include <dali/internal/event/events/hit-test-algorithm-impl.h>
  20
  21 // INTERNAL INCLUDES
  22 #include <dali/integration-api/debug.h>
  23 #include <dali/internal/event/actors/actor-impl.h>
  24 #include <dali/internal/event/actors/camera-actor-impl.h>
  25 #include <dali/internal/event/actors/layer-impl.h>
  26 #include <dali/internal/event/actors/layer-list.h>
  27 #include <dali/internal/event/common/projection.h>
  28 #include <dali/internal/event/events/ray-test.h>
  29 #include <dali/internal/event/render-tasks/render-task-impl.h>
  30 #include <dali/internal/event/render-tasks/render-task-list-impl.h>
  31 #include <dali/internal/event/rendering/renderer-impl.h>
  32 #include <dali/public-api/actors/layer.h>
  33 #include <dali/public-api/math/vector2.h>
  34 #include <dali/public-api/math/vector4.h>
  35
  36 namespace Dali
  37 {
  38 namespace Internal
  39 {
  40 namespace HitTestAlgorithm
  41 {
  42 namespace
  43 {
  44 struct HitActor
  45 {
  46   HitActor()
  47   : actor(nullptr),
  48     distance(std::numeric_limits<float>::max()),
  49     depth(std::numeric_limits<int>::min())
  50   {
  51   }
  52
  53   Actor*  actor;       ///< The actor hit (if actor is hit, then this is initialised).
  54   Vector2 hitPosition; ///< Position of hit (only valid if actor valid).
  55   float   distance;    ///< Distance from ray origin to hit actor.
  56   int32_t depth;       ///< Depth index of this actor.
  57 };
  58
  59 /**
  60  * Creates an Actor handle so that a HitTestFunction provided via the public API can be called.
  61  */
  62 struct HitTestFunctionWrapper : public HitTestInterface
  63 {
  64   /**
  65    * Constructor
  66    *
  67    * @param[in] func HitTestFunction to call with an Actor handle.
  68    */
  69   HitTestFunctionWrapper(Dali::HitTestAlgorithm::HitTestFunction func)
  70   : mFunc(func)
  71   {
  72   }
  73
  74   bool IsActorHittable(Actor* actor) override
  75   {
  76     return mFunc(Dali::Actor(actor), Dali::HitTestAlgorithm::CHECK_ACTOR);
  77   }
  78
  79   bool DescendActorHierarchy(Actor* actor) override
  80   {
  81     return mFunc(Dali::Actor(actor), Dali::HitTestAlgorithm::DESCEND_ACTOR_TREE);
  82   }
  83
  84   bool DoesLayerConsumeHit(Layer* layer) override
  85   {
  86     // Layer::IsTouchConsumed() focuses on touch only. Here we are a wrapper for the public-api
  87     // where the caller may want to check for something completely different.
  88     // TODO: Should provide a means to let caller decide. For now do not allow layers to consume
  89     return false;
  90   }
  91
  92   bool ActorRequiresHitResultCheck(Actor* actor, Integration::Point point, Vector2 hitPointLocal, uint32_t timeStamp) override
  93   {
  94     return actor->EmitHitTestResultSignal(point, hitPointLocal, timeStamp);
  95   }
  96
  97   Dali::HitTestAlgorithm::HitTestFunction mFunc;
  98 };
  99
 100 /**
 101  * Used in the hit-test algorithm to check whether the actor is touchable.
 102  * It is used by the touch event processor.
 103  */
 104 struct ActorTouchableCheck : public HitTestInterface
 105 {
 106   bool IsActorHittable(Actor* actor) override
 107   {
 108     return (actor->GetTouchRequired() || actor->GetInterceptTouchRequired() || actor->IsTouchFocusable()) && // Does the Application or derived actor type require a touch event or a intercept touch event? or focusable by touch?
 109            actor->IsHittable();                                                                              // Is actor sensitive, visible and on the scene?
 110   }
 111
 112   bool DescendActorHierarchy(Actor* actor) override
 113   {
 114     return actor->IsVisible() && // Actor is visible, if not visible then none of its children are visible.
 115            actor->IsSensitive(); // Actor is sensitive, if insensitive none of its children should be hittable either.
 116   }
 117
 118   bool DoesLayerConsumeHit(Layer* layer) override
 119   {
 120     return layer->IsTouchConsumed();
 121   }
 122
 123   bool ActorRequiresHitResultCheck(Actor* actor, Integration::Point point, Vector2 hitPointLocal, uint32_t timeStamp) override
 124   {
 125     return actor->EmitHitTestResultSignal(point, hitPointLocal, timeStamp);
 126   }
 127 };
 128
 129 /**
 130  * Check to see if the actor we're about to hit test is exclusively owned by another rendertask?
 131  */
 132 bool IsActorExclusiveToAnotherRenderTask(const Actor&                               actor,
 133                                          const RenderTask&                          renderTask,
 134                                          const RenderTaskList::ExclusivesContainer& exclusives)
 135
 136 {
 137   if(exclusives.size())
 138   {
 139     for(const auto& exclusive : exclusives)
 140     {
 141       if((exclusive.renderTaskPtr != &renderTask) && (exclusive.actor.GetActor() == &actor))
 142       {
 143         return true;
 144       }
 145     }
 146   }
 147   return false;
 148 }
 149
 150 /**
 151  * Recursively hit test all the actors, without crossing into other layers.
 152  * This algorithm performs a Depth-First-Search (DFS) on all Actors within Layer.
 153  * Hit-Testing each Actor, noting the distance from the Ray-Origin (3D origin
 154  * of touch vector). The closest Hit-Tested Actor is that which is returned.
 155  * Exceptions to this rule are:
 156  * - When comparing against renderable parents, if Actor is the same distance
 157  * or closer than it's renderable parent, then it takes priority.
 158  */
 159 HitActor HitTestWithinLayer(Actor&                                     actor,
 160                             const RenderTask&                          renderTask,
 161                             const RenderTaskList::ExclusivesContainer& exclusives,
 162                             const Vector4&                             rayOrigin,
 163                             const Vector4&                             rayDir,
 164                             float&                                     nearClippingPlane,
 165                             float&                                     farClippingPlane,
 166                             HitTestInterface&                          hitCheck,
 167                             bool&                                      overlayHit,
 168                             bool                                       layerIs3d,
 169                             uint32_t                                   clippingDepth,
 170                             uint32_t                                   clippingBitPlaneMask,
 171                             const RayTest&                             rayTest,
 172                             const Integration::Point&                  point,
 173                             const uint32_t                             eventTime)
 174 {
 175   HitActor hit;
 176
 177   if(IsActorExclusiveToAnotherRenderTask(actor, renderTask, exclusives))
 178   {
 179     return hit;
 180   }
 181
 182   // For clipping, regardless of whether we have hit this actor or not,
 183   // we increase the clipping depth if we have hit a clipping actor.
 184   // This is used later to ensure all nested clipped children have hit
 185   // all clipping actors also for them to be counted as hit.
 186   uint32_t newClippingDepth = clippingDepth;
 187   bool     clippingActor    = actor.GetClippingMode() != ClippingMode::DISABLED;
 188   if(clippingActor)
 189   {
 190     ++newClippingDepth;
 191   }
 192
 193   // If we are a clipping actor or hittable...
 194   if(clippingActor || hitCheck.IsActorHittable(&actor))
 195   {
 196     Vector3 size(actor.GetCurrentSize());
 197
 198     // Ensure the actor has a valid size.
 199     // If so, perform a quick ray sphere test to see if our ray is close to the actor.
 200     if(size.x > 0.0f && size.y > 0.0f && rayTest.SphereTest(actor, rayOrigin, rayDir))
 201     {
 202       Vector2 hitPointLocal;
 203       float   distance;
 204
 205       // Finally, perform a more accurate ray test to see if our ray actually hits the actor.
 206       if(rayTest.ActorTest(actor, rayOrigin, rayDir, hitPointLocal, distance))
 207       {
 208         // Calculate z coordinate value in Camera Space.
 209         const Matrix&  viewMatrix          = renderTask.GetCameraActor()->GetViewMatrix();
 210         const Vector4& hitDir              = Vector4(rayDir.x * distance, rayDir.y * distance, rayDir.z * distance, 0.0f);
 211         const float    cameraDepthDistance = (viewMatrix * hitDir).z;
 212
 213         // Check if cameraDepthDistance is between clipping plane
 214         if(cameraDepthDistance >= nearClippingPlane && cameraDepthDistance <= farClippingPlane)
 215         {
 216           // If the hit has happened on a clipping actor, then add this clipping depth to the mask of hit clipping depths.
 217           // This mask shows all the actors that have been hit at different clipping depths.
 218           if(clippingActor)
 219           {
 220             clippingBitPlaneMask |= 1u << clippingDepth;
 221           }
 222
 223           if(overlayHit && !actor.IsOverlay())
 224           {
 225             // If we have already hit an overlay and current actor is not an overlay ignore current actor.
 226           }
 227           else
 228           {
 229             if(actor.IsOverlay())
 230             {
 231               overlayHit = true;
 232             }
 233
 234             // At this point we have hit an actor.
 235             // Now perform checks for clipping.
 236             // Assume we have hit the actor first as if it is not clipped this would be the case.
 237             bool haveHitActor = true;
 238
 239             // Check if we are performing clipping. IE. if any actors so far have clipping enabled - not necessarily this one.
 240             // We can do this by checking the clipping depth has a value 1 or above.
 241             if(newClippingDepth >= 1u)
 242             {
 243               // Now for us to count this actor as hit, we must have also hit
 244               // all CLIPPING actors up to this point in the hierarchy as well.
 245               // This information is stored in the clippingBitPlaneMask we updated above.
 246               // Here we calculate a comparison mask by setting all the bits up to the current depth value.
 247               // EG. a depth of 4 (10000 binary) = a mask of 1111 binary.
 248               // This allows us a fast way of comparing all bits are set up to this depth.
 249               // Note: If the current Actor has clipping, that is included in the depth mask too.
 250               uint32_t clippingDepthMask = (1u << newClippingDepth) - 1u;
 251
 252               // The two masks must be equal to be a hit, as we are already assuming a hit
 253               // (for non-clipping mode) then they must be not-equal to disqualify the hit.
 254               if(clippingBitPlaneMask != clippingDepthMask)
 255               {
 256                 haveHitActor = false;
 257               }
 258             }
 259
 260             // If the hit actor does not want to hit, the hit-test continues.
 261             if(haveHitActor && hitCheck.ActorRequiresHitResultCheck(&actor, point, hitPointLocal, eventTime))
 262             {
 263               hit.actor       = &actor;
 264               hit.hitPosition = hitPointLocal;
 265               hit.distance    = distance;
 266               hit.depth       = actor.GetSortingDepth();
 267
 268               if(actor.GetRendererCount() > 0)
 269               {
 270                 //Get renderer with maximum depth
 271                 int rendererMaxDepth(actor.GetRendererAt(0).Get()->GetDepthIndex());
 272                 for(uint32_t i(1); i < actor.GetRendererCount(); ++i)
 273                 {
 274                   int depth = actor.GetRendererAt(i).Get()->GetDepthIndex();
 275                   if(depth > rendererMaxDepth)
 276                   {
 277                     rendererMaxDepth = depth;
 278                   }
 279                 }
 280                 hit.depth += rendererMaxDepth;
 281               }
 282             }
 283           }
 284         }
 285       }
 286     }
 287   }
 288
 289   // Find a child hit, until we run out of actors in the current layer.
 290   HitActor childHit;
 291   if(actor.GetChildCount() > 0)
 292   {
 293     childHit.distance        = std::numeric_limits<float>::max();
 294     childHit.depth           = std::numeric_limits<int32_t>::min();
 295     ActorContainer& children = actor.GetChildrenInternal();
 296
 297     // Hit test ALL children and calculate their distance.
 298     bool parentIsRenderable = actor.IsRenderable();
 299
 300     for(ActorIter iter = children.begin(), endIter = children.end(); iter != endIter; ++iter)
 301     {
 302       // Descend tree only if...
 303       if(!(*iter)->IsLayer() &&                           // Child is NOT a layer, hit testing current layer only
 304          (hitCheck.DescendActorHierarchy((*iter).Get()))) // We can descend into child hierarchy
 305       {
 306         HitActor currentHit(HitTestWithinLayer((*iter->Get()),
 307                                                renderTask,
 308                                                exclusives,
 309                                                rayOrigin,
 310                                                rayDir,
 311                                                nearClippingPlane,
 312                                                farClippingPlane,
 313                                                hitCheck,
 314                                                overlayHit,
 315                                                layerIs3d,
 316                                                newClippingDepth,
 317                                                clippingBitPlaneMask,
 318                                                rayTest,
 319                                                point,
 320                                                eventTime));
 321
 322         // Make sure the set hit actor is actually hittable. This is usually required when we have some
 323         // clipping as we need to hit-test all actors as we descend the tree regardless of whether they
 324         // are hittable or not.
 325         if(currentHit.actor && (!hitCheck.IsActorHittable(currentHit.actor)))
 326         {
 327           continue;
 328         }
 329
 330         bool updateChildHit = false;
 331         if(currentHit.distance >= 0.0f)
 332         {
 333           if(layerIs3d)
 334           {
 335             updateChildHit = ((currentHit.depth > childHit.depth) ||
 336                               ((currentHit.depth == childHit.depth) && (currentHit.distance < childHit.distance)));
 337           }
 338           else
 339           {
 340             updateChildHit = currentHit.depth >= childHit.depth;
 341           }
 342         }
 343
 344         if(updateChildHit)
 345         {
 346           if(!parentIsRenderable || currentHit.depth > hit.depth ||
 347              (layerIs3d && (currentHit.depth == hit.depth && currentHit.distance < hit.distance)))
 348           {
 349             childHit = currentHit;
 350           }
 351         }
 352       }
 353     }
 354   }
 355
 356   return (childHit.actor) ? childHit : hit;
 357 }
 358
 359 /**
 360  * Return true if actor is sourceActor or a descendent of sourceActor
 361  */
 362 bool IsWithinSourceActors(const Actor& sourceActor, const Actor& actor)
 363 {
 364   if(&sourceActor == &actor)
 365   {
 366     return true;
 367   }
 368
 369   Actor* parent = actor.GetParent();
 370   if(parent)
 371   {
 372     return IsWithinSourceActors(sourceActor, *parent);
 373   }
 374
 375   // Not within source actors
 376   return false;
 377 }
 378
 379 /**
 380  * Returns true if the layer and all of the layer's parents are visible and sensitive.
 381  */
 382 inline bool IsActuallyHittable(Layer& layer, const Vector2& screenCoordinates, const Vector2& stageSize, HitTestInterface& hitCheck)
 383 {
 384   bool hittable(true);
 385
 386   if(layer.IsClipping())
 387   {
 388     ClippingBox box = layer.GetClippingBox();
 389
 390     if(screenCoordinates.x < static_cast<float>(box.x) ||
 391        screenCoordinates.x > static_cast<float>(box.x + box.width) ||
 392        screenCoordinates.y < stageSize.y - static_cast<float>(box.y + box.height) ||
 393        screenCoordinates.y > stageSize.y - static_cast<float>(box.y))
 394     {
 395       // Not touchable if clipping is enabled in the layer and the screen coordinate is outside the clip region.
 396       hittable = false;
 397     }
 398   }
 399
 400   if(hittable)
 401   {
 402     Actor* actor(&layer);
 403
 404     // Ensure that we can descend into the layer's (or any of its parent's) hierarchy.
 405     while(actor && hittable)
 406     {
 407       if(!hitCheck.DescendActorHierarchy(actor))
 408       {
 409         hittable = false;
 410         break;
 411       }
 412       actor = actor->GetParent();
 413     }
 414   }
 415
 416   return hittable;
 417 }
 418
 419 /**
 420  * Gets the near and far clipping planes of the camera from which the scene is viewed in the render task.
 421  */
 422 void GetCameraClippingPlane(RenderTask& renderTask, float& nearClippingPlane, float& farClippingPlane)
 423 {
 424   CameraActor* cameraActor = renderTask.GetCameraActor();
 425   nearClippingPlane        = cameraActor->GetNearClippingPlane();
 426   farClippingPlane         = cameraActor->GetFarClippingPlane();
 427 }
 428
 429 /**
 430  * Hit test a RenderTask
 431  */
 432 bool HitTestRenderTask(const RenderTaskList::ExclusivesContainer& exclusives,
 433                        const Vector2&                             sceneSize,
 434                        LayerList&                                 layers,
 435                        RenderTask&                                renderTask,
 436                        Vector2                                    screenCoordinates,
 437                        Results&                                   results,
 438                        HitTestInterface&                          hitCheck,
 439                        const RayTest&                             rayTest)
 440 {
 441   if(renderTask.IsHittable(screenCoordinates))
 442   {
 443     Viewport viewport;
 444     renderTask.GetViewport(viewport);
 445     if(screenCoordinates.x < static_cast<float>(viewport.x) ||
 446        screenCoordinates.x > static_cast<float>(viewport.x + viewport.width) ||
 447        screenCoordinates.y < static_cast<float>(viewport.y) ||
 448        screenCoordinates.y > static_cast<float>(viewport.y + viewport.height))
 449     {
 450       // The screen coordinate is outside the viewport of render task. The viewport clips all layers.
 451       return false;
 452     }
 453
 454     float nearClippingPlane, farClippingPlane;
 455     GetCameraClippingPlane(renderTask, nearClippingPlane, farClippingPlane);
 456
 457     // Determine the layer depth of the source actor
 458     Actor* sourceActor(renderTask.GetSourceActor());
 459     if(sourceActor)
 460     {
 461       Dali::Layer layer(sourceActor->GetLayer());
 462       if(layer)
 463       {
 464         const uint32_t sourceActorDepth(layer.GetProperty<bool>(Dali::Layer::Property::DEPTH));
 465
 466         CameraActor* cameraActor     = renderTask.GetCameraActor();
 467         bool         pickingPossible = cameraActor->BuildPickingRay(
 468           screenCoordinates,
 469           viewport,
 470           results.rayOrigin,
 471           results.rayDirection);
 472         if(!pickingPossible)
 473         {
 474           return false;
 475         }
 476
 477         // Hit test starting with the top layer, working towards the bottom layer.
 478         HitActor hit;
 479         bool     overlayHit       = false;
 480         bool     layerConsumesHit = false;
 481
 482         for(int32_t i = layers.GetLayerCount() - 1; i >= 0 && !(hit.actor); --i)
 483         {
 484           Layer* layer(layers.GetLayer(i));
 485           overlayHit = false;
 486
 487           // Ensure layer is touchable (also checks whether ancestors are also touchable)
 488           if(IsActuallyHittable(*layer, screenCoordinates, sceneSize, hitCheck))
 489           {
 490             // Always hit-test the source actor; otherwise test whether the layer is below the source actor in the hierarchy
 491             if(sourceActorDepth == static_cast<uint32_t>(i))
 492             {
 493               // Recursively hit test the source actor & children, without crossing into other layers.
 494               hit = HitTestWithinLayer(*sourceActor,
 495                                        renderTask,
 496                                        exclusives,
 497                                        results.rayOrigin,
 498                                        results.rayDirection,
 499                                        nearClippingPlane,
 500                                        farClippingPlane,
 501                                        hitCheck,
 502                                        overlayHit,
 503                                        layer->GetBehavior() == Dali::Layer::LAYER_3D,
 504                                        0u,
 505                                        0u,
 506                                        rayTest,
 507                                        results.point,
 508                                        results.eventTime);
 509             }
 510             else if(IsWithinSourceActors(*sourceActor, *layer))
 511             {
 512               // Recursively hit test all the actors, without crossing into other layers.
 513               hit = HitTestWithinLayer(*layer,
 514                                        renderTask,
 515                                        exclusives,
 516                                        results.rayOrigin,
 517                                        results.rayDirection,
 518                                        nearClippingPlane,
 519                                        farClippingPlane,
 520                                        hitCheck,
 521                                        overlayHit,
 522                                        layer->GetBehavior() == Dali::Layer::LAYER_3D,
 523                                        0u,
 524                                        0u,
 525                                        rayTest,
 526                                        results.point,
 527                                        results.eventTime);
 528             }
 529
 530             // If this layer is set to consume the hit, then do not check any layers behind it
 531             if(hitCheck.DoesLayerConsumeHit(layer))
 532             {
 533               layerConsumesHit = true;
 534               break;
 535             }
 536           }
 537         }
 538
 539         if(hit.actor)
 540         {
 541           results.renderTask       = RenderTaskPtr(&renderTask);
 542           results.actor            = Dali::Actor(hit.actor);
 543           results.actorCoordinates = hit.hitPosition;
 544
 545           return true; // Success
 546         }
 547
 548         if(layerConsumesHit)
 549         {
 550           return true; // Also success if layer is consuming the hit
 551         }
 552       }
 553     }
 554   }
 555   return false;
 556 }
 557
 558 /**
 559  * Iterate through the RenderTaskList and perform hit testing.
 560  *
 561  * @param[in] sceneSize The scene size the tests will be performed in
 562  * @param[in] layers The list of layers to test
 563  * @param[in] taskList The list of render tasks
 564  * @param[out] results Ray information calculated by the camera
 565  * @param[in] hitCheck The hit testing interface object to use
 566  * @param[in] onScreen True to test on-screen, false to test off-screen
 567  * @return True if we have a hit, false otherwise
 568  */
 569 bool HitTestRenderTaskList(const Vector2&    sceneSize,
 570                            LayerList&        layers,
 571                            RenderTaskList&   taskList,
 572                            const Vector2&    screenCoordinates,
 573                            Results&          results,
 574                            HitTestInterface& hitCheck,
 575                            bool              onScreen)
 576 {
 577   RenderTaskList::RenderTaskContainer&                  tasks      = taskList.GetTasks();
 578   RenderTaskList::RenderTaskContainer::reverse_iterator endIter    = tasks.rend();
 579   const auto&                                           exclusives = taskList.GetExclusivesList();
 580   RayTest                                               rayTest;
 581
 582   for(RenderTaskList::RenderTaskContainer::reverse_iterator iter = tasks.rbegin(); endIter != iter; ++iter)
 583   {
 584     RenderTask& renderTask            = *iter->Get();
 585     const bool  isOffscreenRenderTask = renderTask.GetFrameBuffer();
 586     if((onScreen && isOffscreenRenderTask) || (!onScreen && !isOffscreenRenderTask))
 587     {
 588       // Skip to next task
 589       continue;
 590     }
 591     if(HitTestRenderTask(exclusives, sceneSize, layers, renderTask, screenCoordinates, results, hitCheck, rayTest))
 592     {
 593       // Return true when an actor is hit (or layer in our render-task consumes the hit)
 594       return true; // don't bother checking off screen tasks
 595     }
 596   }
 597
 598   return false;
 599 }
 600
 601 /**
 602  * Iterate through the RenderTaskList and perform hit testing for both on-screen and off-screen.
 603  *
 604  * @param[in] sceneSize The scene size the tests will be performed in
 605  * @param[in] layers The list of layers to test
 606  * @param[in] taskList The list of render tasks
 607  * @param[out] results Ray information calculated by the camera
 608  * @param[in] hitCheck The hit testing interface object to use
 609  * @param[in] onScreen True to test on-screen, false to test off-screen
 610  * @return True if we have a hit, false otherwise
 611  */
 612 bool HitTestForEachRenderTask(const Vector2&    sceneSize,
 613                               LayerList&        layers,
 614                               RenderTaskList&   taskList,
 615                               const Vector2&    screenCoordinates,
 616                               Results&          results,
 617                               HitTestInterface& hitCheck)
 618 {
 619   bool result = false;
 620
 621   // Check on-screen tasks before off-screen ones.
 622   // Hit test order should be reverse of draw order (see ProcessRenderTasks() where off-screen tasks are drawn first).
 623   if(HitTestRenderTaskList(sceneSize, layers, taskList, screenCoordinates, results, hitCheck, true) ||
 624      HitTestRenderTaskList(sceneSize, layers, taskList, screenCoordinates, results, hitCheck, false))
 625   {
 626     // Found hit.
 627     result = true;
 628   }
 629
 630   return result;
 631 }
 632
 633 } // unnamed namespace
 634
 635 HitTestInterface::~HitTestInterface() = default;
 636
 637 bool HitTest(const Vector2& sceneSize, RenderTaskList& taskList, LayerList& layerList, const Vector2& screenCoordinates, Dali::HitTestAlgorithm::Results& results, Dali::HitTestAlgorithm::HitTestFunction func)
 638 {
 639   bool wasHit(false);
 640   // Hit-test the regular on-scene actors
 641   Results                hitTestResults;
 642   HitTestFunctionWrapper hitTestFunctionWrapper(func);
 643   if(HitTestForEachRenderTask(sceneSize, layerList, taskList, screenCoordinates, hitTestResults, hitTestFunctionWrapper))
 644   {
 645     results.actor            = hitTestResults.actor;
 646     results.actorCoordinates = hitTestResults.actorCoordinates;
 647     wasHit                   = true;
 648   }
 649   return wasHit;
 650 }
 651
 652 bool HitTest(const Vector2& sceneSize, RenderTaskList& renderTaskList, LayerList& layerList, const Vector2& screenCoordinates, Results& results, HitTestInterface& hitTestInterface)
 653 {
 654   bool wasHit(false);
 655
 656   // Hit-test the regular on-scene actors
 657   if(!wasHit)
 658   {
 659     wasHit = HitTestForEachRenderTask(sceneSize, layerList, renderTaskList, screenCoordinates, results, hitTestInterface);
 660   }
 661   return wasHit;
 662 }
 663
 664 bool HitTest(const Vector2& sceneSize, RenderTaskList& renderTaskList, LayerList& layerList, const Vector2& screenCoordinates, Results& results)
 665 {
 666   ActorTouchableCheck actorTouchableCheck;
 667   return HitTest(sceneSize, renderTaskList, layerList, screenCoordinates, results, actorTouchableCheck);
 668 }
 669
 670 } // namespace HitTestAlgorithm
 671
 672 } // namespace Internal
 673
 674 } // namespace Dali