examples/image-view-url/image-view-url-example.cpp

   1 /*
   2  * Copyright (c) 2017 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 #include <dali-toolkit/dali-toolkit.h>
  19 #include <dali-toolkit/devel-api/controls/buttons/button-devel.h>
  20 #include <dali-toolkit/devel-api/image-loader/texture-manager.h>
  21
  22 #include "shared/view.h"
  23
  24 using namespace Dali;
  25
  26 namespace
  27 {
  28 const char* BIG_TEST_IMAGE( DEMO_IMAGE_DIR "book-landscape-cover.jpg" );
  29
  30 const char * const APPLICATION_TITLE( "Image View URL" );
  31 const char * const TOOLBAR_IMAGE( DEMO_IMAGE_DIR "top-bar.png" );
  32 const char * const BUTTON_ICON( DEMO_IMAGE_DIR "icon-change.png" );
  33 const char * const BUTTON_ICON_SELECTED( DEMO_IMAGE_DIR "icon-change-selected.png" );
  34
  35 const char* FILTER_FRAGMENT_SOURCE =
  36 {
  37  "precision highp float;\n"
  38  "varying mediump vec2 vTexCoord;\n"
  39  "uniform sampler2D sTexture;\n"
  40  "uniform mediump float uDelta;\n"
  41  "void main()\n"
  42  "{\n"
  43  "  vec4 color = vec4(0.0);\n"
  44  "  vec2 texCoord = vTexCoord * 2. - 1.;\n"
  45  "  mat2 rotation = mat2(cos(uDelta), -sin(uDelta), sin(uDelta), cos(uDelta));"
  46  "  texCoord = (rotation * texCoord) * .5 + .5;\n"
  47  "  color += texture2D( sTexture, texCoord );\n"
  48  "  gl_FragColor = color;\n"
  49  "}\n"
  50 };
  51
  52 const char* DELTA_UNIFORM_NAME = "uDelta";
  53
  54 const Vector2 TARGET_SIZE(800.f, 800.f);
  55 }
  56
  57 class ImageViewUrlApp : public ConnectionTracker
  58 {
  59 public:
  60   ImageViewUrlApp( Application& application )
  61   : mApplication( application ),
  62     mDeltaPropertyIndex( Property::INVALID_INDEX )
  63   {
  64     // Connect to the Application's Init signal
  65     mApplication.InitSignal().Connect( this, &ImageViewUrlApp::Create );
  66   }
  67
  68   ~ImageViewUrlApp() = default;
  69
  70 private:
  71   // The Init signal is received once (only) during the Application lifetime
  72   void Create( Application& application )
  73   {
  74     // Get a handle to the stage
  75     Stage stage = Stage::GetCurrent();
  76     stage.KeyEventSignal().Connect(this, &ImageViewUrlApp::OnKeyEvent);
  77
  78     Toolkit::ToolBar toolBar;
  79     Toolkit::Control background;
  80     // Creates a default view with a default tool bar.
  81     mContent = DemoHelper::CreateView( application,
  82                                             background,
  83                                             toolBar,
  84                                             "",
  85                                             TOOLBAR_IMAGE,
  86                                             APPLICATION_TITLE );
  87
  88     // Add a button to switch the scene. (right of toolbar)
  89     Toolkit::PushButton switchButton = Toolkit::PushButton::New();
  90     switchButton.SetProperty( Toolkit::DevelButton::Property::UNSELECTED_BACKGROUND_VISUAL, BUTTON_ICON );
  91     switchButton.SetProperty( Toolkit::DevelButton::Property::SELECTED_BACKGROUND_VISUAL, BUTTON_ICON_SELECTED );
  92     switchButton.ClickedSignal().Connect( this, &ImageViewUrlApp::OnButtonClicked );
  93     toolBar.AddControl( switchButton,
  94                         DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage,
  95                         Toolkit::Alignment::HorizontalRight,
  96                         DemoHelper::DEFAULT_MODE_SWITCH_PADDING  );
  97
  98     CreateRenderTask(  );
  99     CreateScene( );
 100   }
 101
 102   void CreateRenderTask()
 103   {
 104     auto rootActor = Stage::GetCurrent().GetRootLayer();
 105
 106     auto cameraActor = CameraActor::New(TARGET_SIZE);
 107     cameraActor.SetParentOrigin(ParentOrigin::CENTER);
 108     cameraActor.SetInvertYAxis(true);
 109     rootActor.Add(cameraActor);
 110
 111     {
 112       // create actor to render input with applied shader
 113       mActorForInput = Toolkit::ImageView::New(BIG_TEST_IMAGE);
 114       mActorForInput.SetParentOrigin(ParentOrigin::CENTER);
 115       mActorForInput.SetSize(TARGET_SIZE);
 116       Property::Map customShader;
 117       customShader[Toolkit::Visual::Shader::Property::FRAGMENT_SHADER] = FILTER_FRAGMENT_SOURCE;
 118       Property::Map visualMap;
 119       visualMap.Insert(Toolkit::Visual::Property::SHADER, customShader);
 120       mActorForInput.SetProperty(Toolkit::ImageView::Property::IMAGE, visualMap);
 121
 122       mDeltaPropertyIndex = mActorForInput.RegisterProperty(DELTA_UNIFORM_NAME, 0.f);
 123
 124       rootActor.Add(mActorForInput);
 125
 126       RenderTaskList taskList = Stage::GetCurrent().GetRenderTaskList();
 127
 128       // perform a horizontal blur targeting the internal buffer
 129       auto renderTask = taskList.CreateTask();
 130       renderTask.SetRefreshRate(RenderTask::REFRESH_ALWAYS);
 131       renderTask.SetSourceActor(mActorForInput);
 132       renderTask.SetExclusive(true);
 133       renderTask.SetInputEnabled(false);
 134       renderTask.SetClearColor(Vector4(1.,0.,0.,1.));
 135       renderTask.SetClearEnabled(true);
 136       renderTask.SetCameraActor(cameraActor);
 137
 138       mOutputTexture = Texture::New(TextureType::TEXTURE_2D,
 139                                     Pixel::RGB888,
 140                                     unsigned(TARGET_SIZE.width),
 141                                     unsigned(TARGET_SIZE.height));
 142       auto framebuffer = FrameBuffer::New(TARGET_SIZE.width, TARGET_SIZE.height, Pixel::RGB888);
 143       framebuffer.AttachColorTexture(mOutputTexture);
 144
 145       renderTask.SetFrameBuffer(framebuffer);
 146     }
 147     {
 148       // animate the shader uniform
 149       mAnimation = Animation::New(10.f);
 150
 151       mActorForInput.SetProperty( mDeltaPropertyIndex, 0.f );
 152       mAnimation.AnimateTo( Property( mActorForInput, mDeltaPropertyIndex ), Math::PI * 2.f );
 153       mAnimation.SetLooping(true);
 154       mAnimation.Play();
 155     }
 156   }
 157
 158   void CreateScene( )
 159   {
 160     auto url = Dali::Toolkit::TextureManager::AddTexture(mOutputTexture);
 161     mImageView = Toolkit::ImageView::New(url);
 162
 163     mImageView.SetParentOrigin(ParentOrigin::CENTER);
 164     mImageView.SetAnchorPoint(AnchorPoint::CENTER);
 165     mContent.Add(mImageView);
 166   }
 167
 168   bool OnButtonClicked(Toolkit::Button button)
 169   {
 170     if(mAnimation.GetState() == Animation::State::PLAYING)
 171     {
 172       mAnimation.Pause();
 173     }
 174     else
 175     {
 176       mAnimation.Play();
 177     }
 178     return true;
 179   }
 180
 181   void OnKeyEvent(const KeyEvent& event)
 182   {
 183     if(event.state == KeyEvent::Down)
 184     {
 185       if( IsKey( event, Dali::DALI_KEY_ESCAPE) || IsKey( event, Dali::DALI_KEY_BACK) )
 186       {
 187         mApplication.Quit();
 188       }
 189     }
 190   }
 191
 192 private:
 193   Application&  mApplication;
 194   Layer mContent;
 195   Toolkit::ImageView mImageView;
 196   Animation mAnimation;
 197   Actor mActorForInput;
 198   Property::Index mDeltaPropertyIndex;
 199   Texture mOutputTexture;
 200 };
 201
 202 int DALI_EXPORT_API main( int argc, char **argv )
 203 {
 204   Application application = Application::New( &argc, &argv );
 205   ImageViewUrlApp test( application );
 206   application.MainLoop();
 207   return 0;
 208 }