2 // Copyright (c) 2014 Samsung Electronics Co., Ltd.
4 // Licensed under the Flora License, Version 1.0 (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
8 // http://floralicense.org/license/
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.
18 #include <dali/internal/event/events/hit-test-algorithm-impl.h>
21 #include <dali/integration-api/system-overlay.h>
22 #include <dali/public-api/math/vector2.h>
23 #include <dali/public-api/math/vector4.h>
24 #include <dali/integration-api/debug.h>
25 #include <dali/internal/event/actors/actor-impl.h>
26 #include <dali/internal/event/actors/camera-actor-impl.h>
27 #include <dali/internal/event/actors/layer-impl.h>
28 #include <dali/internal/event/actors/layer-list.h>
29 #include <dali/internal/event/actors/renderable-actor-impl.h>
30 #include <dali/internal/event/common/system-overlay-impl.h>
31 #include <dali/internal/event/common/stage-impl.h>
32 #include <dali/internal/event/common/projection.h>
33 #include <dali/internal/event/render-tasks/render-task-impl.h>
34 #include <dali/internal/event/render-tasks/render-task-list-impl.h>
42 namespace HitTestAlgorithm
54 distance( std::numeric_limits<float>::max() ),
60 Actor *actor; ///< the actor hit. (if actor hit, then initialised)
61 float x; ///< x position of hit (only valid if actor valid)
62 float y; ///< y position of hit (only valid if actor valid)
63 float distance; ///< distance from ray origin to hit actor
64 bool overlay; ///< true if the hit actor is an overlay
69 * The function to be used in the hit-test algorithm to check whether the actor is touchable.
70 * It is used by the touch event and gesture processor.
72 bool IsActorTouchableFunction(Dali::Actor actor, Dali::HitTestAlgorithm::TraverseType type)
74 bool hittable = false;
78 case Dali::HitTestAlgorithm::CHECK_ACTOR:
80 if( GetImplementation(actor).GetTouchRequired() && // Does the Application or derived actor type require a touch event?
81 GetImplementation(actor).IsHittable() ) // Is actor sensitive, visible and on the scene?
87 case Dali::HitTestAlgorithm::DESCEND_ACTOR_TREE:
89 if( actor.IsVisible() && // Actor is visible, if not visible then none of its children are visible.
90 actor.IsSensitive() ) // Actor is sensitive, if insensitive none of its children should be hittable either.
106 * Recursively hit test all the actors, without crossing into other layers.
107 * This algorithm performs a Depth-First-Search (DFS) on all Actors within Layer.
108 * Hit-Testing each Actor, noting the distance from the Ray-Origin (3D origin
109 * of touch vector). The closest Hit-Tested Actor is that which is returned.
110 * Exceptions to this rule are:
111 * - If the Actor is an overlay then it is considered closer than all previous
112 * overlays encountered in the hit test traversal.
113 * - When comparing against renderable parents, if Actor is the same distance
114 * or closer than it's renderable parent, then it takes priority.
116 HitActor HitTestWithinLayer( Actor& actor,
117 const Vector4& rayOrigin,
118 const Vector4& rayDir,
120 float& nearClippingPlane,
121 float& farClippingPlane,
122 Dali::HitTestAlgorithm::HitTestFunction func,
123 bool& stencilOnLayer,
125 bool parentIsStencil )
127 worldOverlay |= actor.IsOverlay();
131 // Children should inherit the stencil draw mode
132 bool isStencil = parentIsStencil;
134 if ( actor.GetDrawMode() == DrawMode::STENCIL && actor.IsVisible() )
137 stencilOnLayer = true;
140 // If we are a stencil or hittable...
141 if ( isStencil || func(Dali::Actor(&actor), Dali::HitTestAlgorithm::CHECK_ACTOR) ) // Is actor hittable
143 Vector3 size( actor.GetCurrentSize() );
145 if ( size.x > 0.0f && size.y > 0.0f && // Ensure the actor has a valid size.
146 actor.RaySphereTest( rayOrigin, rayDir ) ) // Perform quicker ray sphere test to see if our ray is close to the actor.
148 Vector4 hitPointLocal;
151 // Finally, perform a more accurate ray test to see if our ray actually hits the actor.
152 if( actor.RayActorTest( rayOrigin, rayDir, hitPointLocal, distance ) )
154 if( distance >= nearClippingPlane && distance <= farClippingPlane )
156 // If the hit has happened on a stencil then register, but don't record as hit result
164 hit.x = hitPointLocal.x;
165 hit.y = hitPointLocal.y;
166 hit.distance = distance;
167 hit.overlay = worldOverlay;
174 // If there is a stencil on this layer and we've also registered a hit, then don't both searching any children
175 if ( stencilHit && hit.actor )
180 // Find a child hit, until we run out of actors in the current layer.
182 if( actor.GetChildCount() > 0 )
184 childHit.distance = std::numeric_limits<float>::max();
185 Dali::ActorContainer& children = actor.GetChildrenInternal();
187 // Hit test ALL children and calculate their distance.
188 bool parentIsRenderable = actor.IsRenderable();
190 for (Dali::ActorIter iter = children.begin(), endIter = children.end(); iter != endIter; ++iter)
192 // Descend tree only if...
193 if ( !iter->IsLayer() && // Child is NOT a layer, hit testing current layer only or Child is not a layer and we've inherited the stencil draw mode
194 ( isStencil || func(*iter, Dali::HitTestAlgorithm::DESCEND_ACTOR_TREE ) ) ) // Child is visible and sensitive, otherwise none of its children should be hittable.
196 HitActor currentHit( HitTestWithinLayer( GetImplementation(*iter), rayOrigin, rayDir, worldOverlay, nearClippingPlane, farClippingPlane, func, stencilOnLayer, stencilHit, isStencil ) );
198 // If Current child is an overlay, then it takes priority.
199 // If it is not an overlay, and the previously hit sibling is also not an overlay, then closest takes priority.
200 // (last overlay sibling has priority as is rendered on top)
201 if ( currentHit.distance >= 0.f && (currentHit.overlay || (!childHit.overlay && currentHit.distance < childHit.distance) ) )
203 if ( !parentIsRenderable )
205 // If our parent is not renderable, then child should be hit regardless of distance.
206 childHit = currentHit;
208 else if ( currentHit.overlay || (!hit.overlay && currentHit.distance <= hit.distance) )
210 // If our parent is renderable, then child should only be hit if it is an overlay, or if it is closer than a non-overlay.
211 // (child overlay has priority as is rendered on top of it's parent)
212 childHit = currentHit;
218 return ( childHit.actor ) ? childHit : hit;
222 * Return true if actor is sourceActor or a descendent of sourceActor
224 bool IsWithinSourceActors( const Actor& sourceActor, const Actor& actor )
226 if ( &sourceActor == &actor )
232 Actor* parent = actor.GetParent();
235 return IsWithinSourceActors( sourceActor, *parent );
239 // Not within source actors
244 * Returns true if the layer and all of the layer's parents are visible and sensitive.
246 inline bool IsActuallyHittable( Layer& layer, const Vector2& screenCoordinates, const Vector2& stageSize, Dali::HitTestAlgorithm::HitTestFunction func )
248 bool hittable( true );
250 if(layer.IsClipping())
252 ClippingBox box = layer.GetClippingBox();
254 if( screenCoordinates.x < box.x ||
255 screenCoordinates.x > box.x + box.width ||
256 screenCoordinates.y < stageSize.y - (box.y + box.height) ||
257 screenCoordinates.y > stageSize.y - box.y)
259 // Not touchable if clipping is enabled in the layer and the screen coordinate is outside the clip region.
266 Actor* actor( &layer );
267 while ( actor && hittable )
269 if ( !(func(Dali::Actor(actor), Dali::HitTestAlgorithm::DESCEND_ACTOR_TREE)) ) // Layer (or its Parent) is NOT visible and sensitive, so our layer is not either.
274 actor = actor->GetParent();
282 * Gets the near and far clipping planes of the camera from which the scene is viewed in the render task.
284 void GetCameraClippingPlane( RenderTask& renderTask, float& nearClippingPlane, float& farClippingPlane )
286 CameraActor* cameraActor = renderTask.GetCameraActor();
287 nearClippingPlane = cameraActor->GetNearClippingPlane();
288 farClippingPlane = cameraActor->GetFarClippingPlane();
292 * Hit test a RenderTask
294 bool HitTestRenderTask( LayerList& layers,
295 RenderTask& renderTask,
296 Vector2 screenCoordinates,
298 Dali::HitTestAlgorithm::HitTestFunction func )
300 if ( renderTask.IsHittable( screenCoordinates ) )
303 renderTask.GetViewport( viewport );
304 if( screenCoordinates.x < viewport.x ||
305 screenCoordinates.x > viewport.x + viewport.width ||
306 screenCoordinates.y < viewport.y ||
307 screenCoordinates.y > viewport.y + viewport.height )
309 // The screen coordinate is outside the viewport of render task. The viewport clips all layers.
313 float nearClippingPlane, farClippingPlane;
314 GetCameraClippingPlane(renderTask, nearClippingPlane, farClippingPlane);
316 // Determine the layer depth of the source actor
317 Actor* sourceActor( renderTask.GetSourceActor() );
320 Dali::Layer layer( sourceActor->GetLayer() );
323 const unsigned int sourceActorDepth( layer.GetDepth() );
325 CameraActor* cameraActor = renderTask.GetCameraActor();
326 bool pickingPossible = cameraActor->BuildPickingRay(
330 results.rayDirection );
331 if( !pickingPossible )
336 // Hit test starting with the top layer, working towards the bottom layer.
338 bool stencilOnLayer = false;
339 bool stencilHit = false;
340 const Vector2& stageSize = Stage::GetCurrent()->GetSize();
342 for (int i=layers.GetLayerCount()-1; i>=0 && !(hit.actor); --i)
344 Layer* layer( layers.GetLayer(i) );
346 HitActor previousHit = hit;
347 stencilOnLayer = false;
350 // Ensure layer is touchable (also checks whether ancestors are also touchable)
351 if ( IsActuallyHittable ( *layer, screenCoordinates, stageSize, func ) )
353 // Always hit-test the source actor; otherwise test whether the layer is below the source actor in the hierarchy
354 if ( sourceActorDepth == static_cast<unsigned int>(i) )
356 // Recursively hit test the source actor & children, without crossing into other layers.
357 hit = HitTestWithinLayer( *sourceActor, results.rayOrigin, results.rayDirection, false, nearClippingPlane, farClippingPlane, func, stencilOnLayer, stencilHit, false );
359 else if ( IsWithinSourceActors( *sourceActor, *layer ) )
361 // Recursively hit test all the actors, without crossing into other layers.
362 hit = HitTestWithinLayer( *layer, results.rayOrigin, results.rayDirection, false, nearClippingPlane, farClippingPlane, func, stencilOnLayer, stencilHit, false );
364 // If a stencil on this layer hasn't been hit, then discard hit results for this layer
365 if ( stencilOnLayer && !stencilHit )
373 results.renderTask = Dali::RenderTask(&renderTask);
374 results.actor = Dali::Actor(hit.actor);
375 results.actorCoordinates.x = hit.x;
376 results.actorCoordinates.y = hit.y;
377 return true; // Success
386 * Iterate through RenderTaskList and perform hit test.
389 void HitTestForEachRenderTask( LayerList& layers,
390 RenderTaskList& taskList,
391 const Vector2& screenCoordinates,
393 Dali::HitTestAlgorithm::HitTestFunction func )
395 RenderTaskList::RenderTaskContainer& tasks = taskList.GetTasks();
396 RenderTaskList::RenderTaskContainer::reverse_iterator endIter = tasks.rend();
398 // Check onscreen tasks before offscreen ones, hit test order should be reverse of draw order (see ProcessRenderTasks() where offscreen tasks are drawn first).
401 for ( RenderTaskList::RenderTaskContainer::reverse_iterator iter = tasks.rbegin(); endIter != iter; ++iter )
403 RenderTask& renderTask = GetImplementation( *iter );
404 Dali::FrameBufferImage frameBufferImage = renderTask.GetTargetFrameBuffer();
406 // Note that if frameBufferImage is NULL we are using the default (on screen) render target
409 ResourceId id = GetImplementation(frameBufferImage).GetResourceId();
419 if ( HitTestRenderTask( layers, renderTask, screenCoordinates, results, func ) )
421 // Exit when an actor is hit
422 return; // don't bother checking off screen tasks
427 for ( RenderTaskList::RenderTaskContainer::reverse_iterator iter = tasks.rbegin(); endIter != iter; ++iter )
429 RenderTask& renderTask = GetImplementation( *iter );
430 Dali::FrameBufferImage frameBufferImage = renderTask.GetTargetFrameBuffer();
432 // Note that if frameBufferImage is NULL we are using the default (on screen) render target
435 ResourceId id = GetImplementation(frameBufferImage).GetResourceId();
444 if ( HitTestRenderTask( layers, renderTask, screenCoordinates, results, func ) )
446 // Exit when an actor is hit
453 } // unnamed namespace
455 void HitTest( Stage& stage, const Vector2& screenCoordinates, Dali::HitTestAlgorithm::Results& results, Dali::HitTestAlgorithm::HitTestFunction func )
457 // Hit-test the regular on-stage actors
458 RenderTaskList& taskList = stage.GetRenderTaskList();
459 LayerList& layerList = stage.GetLayerList();
461 Results hitTestResults;
462 HitTestForEachRenderTask( layerList, taskList, screenCoordinates, hitTestResults, func );
464 results.actor = hitTestResults.actor;
465 results.actorCoordinates = hitTestResults.actorCoordinates;
468 void HitTest( Stage& stage, const Vector2& screenCoordinates, Results& results )
470 // Hit-test the system-overlay actors first
471 SystemOverlay* systemOverlay = stage.GetSystemOverlayInternal();
475 RenderTaskList& overlayTaskList = systemOverlay->GetOverlayRenderTasks();
476 LayerList& overlayLayerList = systemOverlay->GetLayerList();
478 HitTestForEachRenderTask( overlayLayerList, overlayTaskList, screenCoordinates, results, IsActorTouchableFunction );
481 // Hit-test the regular on-stage actors
482 if ( !results.actor )
484 RenderTaskList& taskList = stage.GetRenderTaskList();
485 LayerList& layerList = stage.GetLayerList();
487 HitTestForEachRenderTask( layerList, taskList, screenCoordinates, results, IsActorTouchableFunction );
491 void HitTest( Stage& stage, RenderTask& renderTask, const Vector2& screenCoordinates,
492 Dali::HitTestAlgorithm::Results& results, Dali::HitTestAlgorithm::HitTestFunction func )
494 Results hitTestResults;
495 HitTestRenderTask( stage.GetLayerList(), renderTask, screenCoordinates, hitTestResults, func );
496 results.actor = hitTestResults.actor;
497 results.actorCoordinates = hitTestResults.actorCoordinates;
500 } // namespace HitTestAlgorithm
502 } // namespace Internal