1 #ifndef __DALI_TOOLKIT_SHADOW_VIEW_H__
2 #define __DALI_TOOLKIT_SHADOW_VIEW_H__
5 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
24 #include <dali-toolkit/public-api/controls/control.h>
26 namespace Dali DALI_IMPORT_API
32 namespace Internal DALI_INTERNAL
36 * ShadowView implementation class
40 } // namespace Internal
44 * ShadowView is a class for applying shadows to objects present in the view.
48 * 1) The ShadowView object will render all its child actors offscreen from the light's point of view projected on to the shadow plane in a seperate render task.\n
49 * 2) The ShadowView object then blurs the result of step 1), using a two pass separated Gaussian blur.\n
50 * 3) The ShadowView object gets rendered automatically in the default render task along with it's children.
52 * Fundamentally, the ShadowView is simply an Actor in the normal actor tree that affects all of its children. It should be added to your Actor tree and manipulated in the
53 * normal way. It can be considered a 'portal' in the sense that all child actors are clipped to the ShadowView actor bounds.
56 * The ShadowView is intended to provide simple planar projection shadows, Which means it needs a flat plane to cast shadows. So Shadows can't be cast on other objects.
59 * NB: It is essential to remove the ShadowView from the stage and also to call Deactivate() on it when you are not using it. This will ensure that resources are freed and
67 * ShadowView shadowView = ShadowView::New();
69 * // create and add some visible actors to the ShadowView, all these child actors will therefore cast a shadow.
70 * Image image = Image::New(...);
71 * ImageActor imageActor = ImageActor::New(image);
72 * imageActor.SetParentOrigin( ParentOrigin::CENTER );
73 * imageActor.SetAnchorPoint( AnchorPoint::CENTER );
74 * shadowView.Add(imageActor);\n Add the renderable actor to the shadow view
76 * ImageActor shadowPlane = ImageActor::New(); //This will be the shadow plane
77 * shadowPlane.SetParentOrigin( ParentOrigin::CENTER );
78 * shadowPlane.SetAnchorPoint( AnchorPoint::CENTER );
79 * shadowPlane.SetSize(700.0f, 700.0f);
80 * shadowPlane.SetPosition( Vector3(0.0f, 0.0f, -30.0f) ); //Just behind the image actor.
81 * shadowPlane.SetShadowPlane(ShadowPlane);
83 * Actor pointLight = Actor::New(); // This will be the light source
84 * pointLight.SetPosition(300.0f, 250.0f, 600.0f);
85 * Stage::GetCurrent().Add(pointLight);
86 * shadowView.SetPointLight(pointLight);
88 * // Start rendering the ShadowView
89 * Stage::GetCurrent().Add(ShadowPlane);
90 * shadowView.Activate();
93 * // animate the strength of the blur - this can fade between no blur and full blur. See GetBlurStrengthPropertyIndex().
94 * Animation blurAnimation = Animation::New( ... );
95 * blurAnimation.AnimateTo( Property( shadowView, shadowView.GetBlurStrengthPropertyIndex() ), ... );
96 * blurAnimation.Play();
99 * // Stop rendering the ShadowView
100 * Stage::GetCurrent().Remove(shadowView);
101 * shadowView.Deactivate();
104 class ShadowView : public Control
109 * Create an uninitialized ShadowView; this can be initialized with ShadowView::New()
110 * Calling member functions with an uninitialized Dali::Object is not allowed.
115 * Copy constructor. Creates another handle that points to the same real object
117 ShadowView(const ShadowView& handle);
120 * Assignment operator. Changes this handle to point to another real object
122 ShadowView& operator=(const ShadowView& view);
127 * This is non-virtual since derived Handle types must not contain data or virtual methods.
132 * Downcast an Object handle to ShadowView. If handle points to a ShadowView the
133 * downcast produces valid handle. If not the returned handle is left uninitialized.
134 * @param[in] handle Handle to an object
135 * @return handle to a ShadowView or an uninitialized handle
137 static ShadowView DownCast( BaseHandle handle );
140 * Create an initialized ShadowView. Add children and call SetShadowPlane to make shadows visible\n
141 * @return A handle to a newly allocated Dali resource
143 static ShadowView New();
146 * Create an initialized ShadowView. Add children and call SetShadowPlane to make shadows visible\n
147 * @param[in] downsampleWidthScale The width scale factor applied during the blur process, scaling the size of the source image to the size of the final blurred image output.
148 * Useful for downsampling - trades visual quality for processing speed. A value of 1.0f results in no scaling applied.
149 * @param[in] downsampleHeightScale The height scale factor applied during the blur process, scaling the size of the source image to the size of the final blurred image output.
150 * Useful for downsampling - trades visual quality for processing speed. A value of 1.0f results in no scaling applied.
151 * @return A handle to a newly allocated Dali resource
153 static ShadowView New(float downsampleWidthScale, float downsampleHeightScale);
156 * Adds a child Actor to this Actor.
157 * NOTE! if the child already has a parent, it will be removed from old parent
158 * and reparented to this actor. This may change childs position, color, shader effect,
159 * scale etc as it now inherits them from this actor
160 * @pre This Actor (the parent) has been initialized.
161 * @pre The child actor has been initialized.
162 * @pre The child actor is not the same as the parent actor.
163 * @pre The actor is not the Root actor
164 * @param [in] child The child.
165 * @post The child will be referenced by its parent. This means that the child will be kept alive,
166 * even if the handle passed into this method is reset or destroyed.
167 * @post This may invalidate ActorContainer iterators.
169 void Add(Actor child);
172 * Removes a child Actor from this Actor.
173 * If the actor was not a child of this actor, this is a no-op.
174 * @pre This Actor (the parent) has been initialized.
175 * @pre The child actor is not the same as the parent actor.
176 * @param [in] child The child.
177 * @post This may invalidate ActorContainer iterators.
179 void Remove(Actor child);
182 * Set the Shadow Plane for the shadow effect.
184 * @param[in] shadowPlane An actor representing the shadow
185 * plane. The position of the actor represents the origin of the
186 * plane, and the orientation of the actor represents the direction
187 * of the plane normal. Make the plane sufficiently large if the shadows are
190 void SetShadowPlane(ImageActor shadowPlane);
193 * Set the Point Light for the shadow effect. This is usually NOT a renderable actor.
194 * The orientation of the actor is not considered for the shadow calculation.
195 * @param[in] pointLight An actor representing the location of the
196 * directionless light source that casts the shadow.
198 void SetPointLight(Actor pointLight);
201 * Set the field of view of the point light source. This will be used by an additional
202 * internal camera to look at the scene form the light source. If you notice any aritifacts
203 * when the light position is near to the object, Increase the field of view.
204 * @param[in] fieldOfView New field of view in radians, Typical values are Math::PI / 4.0f,
207 void SetPointLightFieldOfView(float fieldOfView);
211 * @param[in] color The shadow color
213 void SetShadowColor(Vector4 color);
216 * Start rendering the ShadowView. Must be called after you Add() it to the stage.
217 * @pre This Actor has been added to the stage.
222 * Stop rendering the ShadowView. Must be called after you Remove() it from the stage.
223 * @pre This Actor has been removed from the stage.
228 * Get the property index that controls the strength of the blur applied to the shadow. Useful for animating this property.
229 * This property represents a value in the range [0.0 - 1.0] where 0.0 is no blur and 1.0 is full blur. Default 0.2.
230 * @return The property index that can be used with e.g. AnimateTo( ... )
232 Property::Index GetBlurStrengthPropertyIndex() const;
235 * Get the property index that controls the color of the shadow. Useful for animating this property.
236 * This property represents a value in the Vector4 format. Default color value is Vector4(0.2f, 0.2f, 0.2f, 0.8f) (i.e grey color).
237 * @return The property index that can be used with e.g. AnimateTo( ... )
239 Property::Index GetShadowColorPropertyIndex() const;
245 * Creates a handle using the Toolkit::Internal implementation.
246 * @param[in] implementation The UI Control implementation.
248 ShadowView( Internal::ShadowView& implementation );
251 * Allows the creation of this UI Control from an Internal::CustomActor pointer.
252 * @param[in] internal A pointer to the internal CustomActor.
254 ShadowView( Dali::Internal::CustomActor* internal );
257 } // namespace Toolkit
261 #endif // __DALI_TOOLKIT_SHADOW_VIEW_H__