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, std::string url )
  61   : mApplication( application ),
  62     mUrl( url ),
  63     mDeltaPropertyIndex( Property::INVALID_INDEX )
  64   {
  65     // Connect to the Application's Init signal
  66     mApplication.InitSignal().Connect( this, &ImageViewUrlApp::Create );
  67   }
  68
  69   ~ImageViewUrlApp() = default;
  70
  71 private:
  72   // The Init signal is received once (only) during the Application lifetime
  73   void Create( Application& application )
  74   {
  75     // Get a handle to the stage
  76     Stage stage = Stage::GetCurrent();
  77     stage.KeyEventSignal().Connect(this, &ImageViewUrlApp::OnKeyEvent);
  78
  79     Toolkit::ToolBar toolBar;
  80     Toolkit::Control background;
  81     // Creates a default view with a default tool bar.
  82     mContent = DemoHelper::CreateView( application,
  83                                             background,
  84                                             toolBar,
  85                                             "",
  86                                             TOOLBAR_IMAGE,
  87                                             APPLICATION_TITLE );
  88
  89     // Add a button to switch the scene. (right of toolbar)
  90     Toolkit::PushButton switchButton = Toolkit::PushButton::New();
  91     switchButton.SetProperty( Toolkit::DevelButton::Property::UNSELECTED_BACKGROUND_VISUAL, BUTTON_ICON );
  92     switchButton.SetProperty( Toolkit::DevelButton::Property::SELECTED_BACKGROUND_VISUAL, BUTTON_ICON_SELECTED );
  93     switchButton.ClickedSignal().Connect( this, &ImageViewUrlApp::OnButtonClicked );
  94     toolBar.AddControl( switchButton,
  95                         DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage,
  96                         Toolkit::Alignment::HorizontalRight,
  97                         DemoHelper::DEFAULT_MODE_SWITCH_PADDING  );
  98
  99     std::string url = mUrl;
 100     if( url.empty() )
 101     {
 102       url = BIG_TEST_IMAGE;
 103     }
 104
 105     CreateRenderTask( url );
 106     CreateScene( );
 107   }
 108
 109   void CreateRenderTask( const std::string& url )
 110   {
 111     auto rootActor = Stage::GetCurrent().GetRootLayer();
 112
 113     auto cameraActor = CameraActor::New(TARGET_SIZE);
 114     cameraActor.SetParentOrigin(ParentOrigin::CENTER);
 115     cameraActor.SetInvertYAxis(true);
 116     rootActor.Add(cameraActor);
 117
 118     {
 119       // create actor to render input with applied shader
 120       mActorForInput = Toolkit::ImageView::New( url );
 121       mActorForInput.SetParentOrigin(ParentOrigin::CENTER);
 122       mActorForInput.SetSize(TARGET_SIZE);
 123       Property::Map customShader;
 124       customShader[Toolkit::Visual::Shader::Property::FRAGMENT_SHADER] = FILTER_FRAGMENT_SOURCE;
 125       Property::Map visualMap;
 126       visualMap.Insert(Toolkit::Visual::Property::SHADER, customShader);
 127       mActorForInput.SetProperty(Toolkit::ImageView::Property::IMAGE, visualMap);
 128
 129       mDeltaPropertyIndex = mActorForInput.RegisterProperty(DELTA_UNIFORM_NAME, 0.f);
 130
 131       rootActor.Add(mActorForInput);
 132
 133       RenderTaskList taskList = Stage::GetCurrent().GetRenderTaskList();
 134
 135       // perform a horizontal blur targeting the internal buffer
 136       auto renderTask = taskList.CreateTask();
 137       renderTask.SetRefreshRate(RenderTask::REFRESH_ALWAYS);
 138       renderTask.SetSourceActor(mActorForInput);
 139       renderTask.SetExclusive(true);
 140       renderTask.SetInputEnabled(false);
 141       renderTask.SetClearColor(Vector4(1.,0.,0.,1.));
 142       renderTask.SetClearEnabled(true);
 143       renderTask.SetCameraActor(cameraActor);
 144
 145       mOutputTexture = Texture::New(TextureType::TEXTURE_2D,
 146                                     Pixel::RGB888,
 147                                     unsigned(TARGET_SIZE.width),
 148                                     unsigned(TARGET_SIZE.height));
 149       auto framebuffer = FrameBuffer::New(TARGET_SIZE.width, TARGET_SIZE.height, FrameBuffer::Attachment::NONE );
 150       framebuffer.AttachColorTexture(mOutputTexture);
 151
 152       renderTask.SetFrameBuffer(framebuffer);
 153     }
 154     {
 155       // animate the shader uniform
 156       mAnimation = Animation::New(10.f);
 157
 158       mActorForInput.SetProperty( mDeltaPropertyIndex, 0.f );
 159       mAnimation.AnimateTo( Property( mActorForInput, mDeltaPropertyIndex ), Math::PI * 2.f );
 160       mAnimation.SetLooping(true);
 161       mAnimation.Play();
 162     }
 163   }
 164
 165   void CreateScene( )
 166   {
 167     auto url = Dali::Toolkit::TextureManager::AddTexture(mOutputTexture);
 168     mImageView = Toolkit::ImageView::New(url);
 169
 170     mImageView.SetParentOrigin(ParentOrigin::CENTER);
 171     mImageView.SetAnchorPoint(AnchorPoint::CENTER);
 172     mContent.Add(mImageView);
 173   }
 174
 175   bool OnButtonClicked(Toolkit::Button button)
 176   {
 177     if(mAnimation.GetState() == Animation::State::PLAYING)
 178     {
 179       mAnimation.Pause();
 180     }
 181     else
 182     {
 183       mAnimation.Play();
 184     }
 185     return true;
 186   }
 187
 188   void OnKeyEvent(const KeyEvent& event)
 189   {
 190     if(event.state == KeyEvent::Down)
 191     {
 192       if( IsKey( event, Dali::DALI_KEY_ESCAPE) || IsKey( event, Dali::DALI_KEY_BACK) )
 193       {
 194         mApplication.Quit();
 195       }
 196     }
 197   }
 198
 199 private:
 200   Application&  mApplication;
 201   std::string mUrl;
 202   Layer mContent;
 203   Toolkit::ImageView mImageView;
 204   Animation mAnimation;
 205   Actor mActorForInput;
 206   Property::Index mDeltaPropertyIndex;
 207   Texture mOutputTexture;
 208 };
 209
 210 int DALI_EXPORT_API main( int argc, char **argv )
 211 {
 212   Application application = Application::New( &argc, &argv );
 213
 214   std::string url;
 215   if( argc > 1 )
 216   {
 217     url = argv[1];
 218   }
 219
 220   ImageViewUrlApp test( application, url );
 221   application.MainLoop();
 222   return 0;
 223 }