Example of using pre-multiplied alpha in ImageView

Change-Id: Icae141ade364286a2bbc7e26ce2db81c583c224e

diff --git a/com.samsung.dali-demo.xml b/com.samsung.dali-demo.xml
index 7eb994f..2517645 100644 (file)
--- a/com.samsung.dali-demo.xml
+++ b/com.samsung.dali-demo.xml
@@ -130,4 +130,7 @@
        <ui-application appid="image-view-pixel-area.example" exec="/usr/apps/com.samsung.dali-demo/bin/image-view-pixel-area.example" nodisplay="true" multiple="false" type="c++app" taskmanage="true">
                <label>ImageView Pixel Area</label>
        </ui-application>
+       <ui-application appid="image-view-alpha-blending.example" exec="/usr/apps/com.samsung.dali-demo/bin/image-view-alpha-blending.example" nodisplay="true" multiple="false" type="c++app" taskmanage="true">
+               <label>ImageView Alpha Blending</label>
+       </ui-application>
 </manifest>

diff --git a/demo/dali-demo.cpp b/demo/dali-demo.cpp
index 73df547..70e6085 100644 (file)
--- a/demo/dali-demo.cpp
+++ b/demo/dali-demo.cpp
@@ -70,6 +70,7 @@ int main(int argc, char **argv)
   demo.AddExample(Example("gradients.example", DALI_DEMO_STR_TITLE_COLOR_GRADIENT));
   demo.AddExample(Example("image-view.example", DALI_DEMO_STR_TITLE_IMAGE_VIEW));
   demo.AddExample(Example("image-view-pixel-area.example", DALI_DEMO_STR_TITLE_IMAGE_VIEW_PIXEL_AREA));
+  demo.AddExample(Example("image-view-alpha-blending.example", DALI_DEMO_STR_TITLE_IMAGE_VIEW_ALPHA_BLENDING));
   demo.AddExample(Example("super-blur-bloom.example", DALI_DEMO_STR_TITLE_SUPER_BLUR_BLOOM));
 
   demo.SortAlphabetically( true );

diff --git a/examples/image-view-alpha-blending/image-view-alpha-blending-example.cpp b/examples/image-view-alpha-blending/image-view-alpha-blending-example.cpp
new file mode 100644 (file)
index 0000000..92f6aee
--- /dev/null
+++ b/examples/image-view-alpha-blending/image-view-alpha-blending-example.cpp
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <dali-toolkit/dali-toolkit.h>
+
+using namespace Dali;
+
+class ImageViewAlphaBlendApp : public ConnectionTracker
+{
+public:
+  ImageViewAlphaBlendApp( Application& application )
+  : mApplication( application ),
+    mIndex(0u)
+  {
+    // Connect to the Application's Init signal
+    mApplication.InitSignal().Connect( this, &ImageViewAlphaBlendApp::Create );
+  }
+
+  ~ImageViewAlphaBlendApp()
+  {
+    // Nothing to do here;
+  }
+
+private:
+  // The Init signal is received once (only) during the Application lifetime
+  void Create( Application& application )
+  {
+    // Get a handle to the stage
+    Stage stage = Stage::GetCurrent();
+    stage.KeyEventSignal().Connect(this, &ImageViewAlphaBlendApp::OnKeyEvent);
+
+    Vector4 green0 = Vector4( 0.f, 1.f, 0.f, 0.25f );
+    Vector4 green1 = Vector4( 0.f, 0.25f, 0.f, 0.25f );
+    BufferImage redGreen0 = CreateBufferImage( Color::RED, green0 );
+    BufferImage redGreen1 = CreateBufferImage( Color::RED, green1 );
+    ResourceImage testImage = ResourceImage::New( DALI_IMAGE_DIR "gallery-large-20.jpg" );
+    float imageSize = 512.f;
+
+    Toolkit::ImageView imageView0 = Toolkit::ImageView::New( testImage );
+    imageView0.SetSize(imageSize, imageSize);
+    imageView0.SetParentOrigin( ParentOrigin::CENTER );
+    imageView0.SetY( -imageSize*0.5f );
+    stage.Add(imageView0);
+    Toolkit::ImageView imageView1 = Toolkit::ImageView::New( redGreen0 );
+    imageView1.SetParentOrigin( ParentOrigin::CENTER );
+    imageView1.SetSize(imageSize, imageSize);
+    imageView0.Add(imageView1);
+
+    Toolkit::ImageView imageView2 = Toolkit::ImageView::New( testImage);
+    imageView2.SetSize(imageSize, imageSize);
+    imageView2.SetParentOrigin( ParentOrigin::CENTER );
+    imageView2.SetY( imageSize*0.5f );
+    stage.Add(imageView2);
+    Toolkit::ImageView imageView3 = Toolkit::ImageView::New( redGreen1);
+    imageView3.SetParentOrigin( ParentOrigin::CENTER );
+    imageView3.SetSize(imageSize, imageSize);
+    imageView2.Add(imageView3);
+
+    imageView2.SetProperty( Toolkit::ImageView::Property::PRE_MULTIPLIED_ALPHA, true );
+    imageView3.SetProperty( Toolkit::ImageView::Property::PRE_MULTIPLIED_ALPHA, true );
+
+    Animation animation = Animation::New( 10.f );
+    animation.AnimateTo(Property(imageView0, Actor::Property::COLOR), Vector4(1.0f, 1.0f, 1.0f, 0.0f), AlphaFunction::BOUNCE, TimePeriod( 2.f, 8.f ));
+    animation.AnimateTo(Property(imageView2, Actor::Property::COLOR), Vector4(1.0f, 1.0f, 1.0f, 0.0f), AlphaFunction::BOUNCE, TimePeriod( 2.f, 8.f ));
+    animation.SetLooping( true );
+    animation.Play();
+  }
+
+  void OnKeyEvent(const KeyEvent& event)
+  {
+    if(event.state == KeyEvent::Down)
+    {
+      if( IsKey( event, Dali::DALI_KEY_ESCAPE) || IsKey( event, Dali::DALI_KEY_BACK) )
+      {
+        mApplication.Quit();
+      }
+    }
+  }
+
+  BufferImage CreateBufferImage( const Vector4& color1, const Vector4& color2 )
+  {
+    BufferImage image = BufferImage::New( 2, 1, Pixel::RGBA8888 );
+    PixelBuffer* pixelBuffer = image.GetBuffer();
+    pixelBuffer[0]=0xFF * color1.x;
+    pixelBuffer[1]=0xFF * color1.y;
+    pixelBuffer[2]=0xFF * color1.z;
+    pixelBuffer[3]=0xFF * color1.w;
+    pixelBuffer[4]=0xFF * color2.x;
+    pixelBuffer[5]=0xFF * color2.y;
+    pixelBuffer[6]=0xFF * color2.z;
+    pixelBuffer[7]=0xFF * color2.w;
+    image.Update();
+    return image;
+  }
+
+
+private:
+  Application&  mApplication;
+  unsigned int mIndex;
+};
+
+void RunTest( Application& application )
+{
+  ImageViewAlphaBlendApp test( application );
+
+  application.MainLoop();
+}
+
+// Entry point for Linux & Tizen applications
+//
+int main( int argc, char **argv )
+{
+  Application application = Application::New( &argc, &argv );
+
+  RunTest( application );
+
+  return 0;
+}

diff --git a/shared/dali-demo-strings.h b/shared/dali-demo-strings.h
index 0fae544..633e07a 100644 (file)
--- a/shared/dali-demo-strings.h
+++ b/shared/dali-demo-strings.h
@@ -99,6 +99,7 @@ extern "C"
 #define DALI_DEMO_STR_TITLE_COLOR_GRADIENT            "Color Gradient"
 #define DALI_DEMO_STR_TITLE_IMAGE_VIEW                "Image View"
 #define DALI_DEMO_STR_TITLE_IMAGE_VIEW_PIXEL_AREA     "Image View Pixel Area"
+#define DALI_DEMO_STR_TITLE_IMAGE_VIEW_ALPHA_BLENDING "Image View Alpha Blending"
 #define DALI_DEMO_STR_TITLE_SUPER_BLUR_BLOOM          "Super Blur and Bloom"
 
 #endif