image-view-alpha-blending-example.cpp
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/*
* Copyright (c) 2022 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>
#include <dali-toolkit/devel-api/image-loader/texture-manager.h>
#include <dali-toolkit/devel-api/visuals/visual-properties-devel.h>
using namespace Dali;
namespace
{
const char* const IMAGE_PATH(DEMO_IMAGE_DIR "gallery-large-20.jpg");
}
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 window
Window window = application.GetWindow();
window.KeyEventSignal().Connect(this, &ImageViewAlphaBlendApp::OnKeyEvent);
const Vector2 windowSize = window.GetSize();
const bool portraitOrientation = windowSize.width < windowSize.height;
const Property::Index positionProperty = portraitOrientation ? Actor::Property::POSITION_Y : Actor::Property::POSITION_X;
auto green0 = Vector4(0.f, 1.f, 0.f, 0.25f);
auto green1 = Vector4(0.f, 0.25f, 0.f, 0.25f);
auto redGreen0 = CreateTexture(Color::RED, green0);
auto redGreen1 = CreateTexture(Color::RED, green1);
float imageSize = 512.f;
Toolkit::ImageView imageView0 = CreateImageView(IMAGE_PATH);
imageView0.SetProperty(Actor::Property::SIZE, Vector2(imageSize, imageSize));
imageView0.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
imageView0.SetProperty(positionProperty, -imageSize * 0.5f);
window.Add(imageView0);
Toolkit::ImageView imageView1 = CreateImageView(redGreen0);
imageView1.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
imageView1.SetProperty(Actor::Property::SIZE, Vector2(imageSize, imageSize));
imageView0.Add(imageView1);
Toolkit::ImageView imageView2 = CreateImageView(IMAGE_PATH);
imageView2.SetProperty(Actor::Property::SIZE, Vector2(imageSize, imageSize));
imageView2.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
imageView2.SetProperty(positionProperty, imageSize * 0.5f);
window.Add(imageView2);
Toolkit::ImageView imageView3 = CreateImageView(redGreen1);
imageView3.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
imageView3.SetProperty(Actor::Property::SIZE, Vector2(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.GetState() == KeyEvent::DOWN)
{
if(IsKey(event, Dali::DALI_KEY_ESCAPE) || IsKey(event, Dali::DALI_KEY_BACK))
{
mApplication.Quit();
}
}
}
std::string CreateTexture(const Vector4& color1, const Vector4& color2)
{
const auto width = 2u;
const auto height = 1u;
auto size = width * height * 4;
auto pixelBuffer = new unsigned char[size];
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;
auto pixelData = PixelData::New(pixelBuffer, size, width, height, Pixel::RGBA8888, PixelData::ReleaseFunction::DELETE_ARRAY);
auto texture = Texture::New(TextureType::TEXTURE_2D, Pixel::RGBA8888, width, height);
texture.Upload(pixelData);
return Toolkit::TextureManager::AddTexture(texture);
}
template<typename TextT>
Toolkit::ImageView CreateImageView(TextT&& filename)
{
auto imageView = Toolkit::ImageView::New();
Property::Map propertyMap;
propertyMap.Insert(Toolkit::ImageVisual::Property::URL, std::forward<TextT>(filename));
propertyMap.Insert(Toolkit::Visual::Property::TYPE, Toolkit::Visual::IMAGE);
propertyMap.Insert(Toolkit::DevelVisual::Property::VISUAL_FITTING_MODE, Toolkit::DevelVisual::FILL);
imageView.SetProperty(Toolkit::ImageView::Property::IMAGE, propertyMap);
return imageView;
}
private:
Application& mApplication;
unsigned int mIndex;
};
int DALI_EXPORT_API main(int argc, char** argv)
{
Application application = Application::New(&argc, &argv);
ImageViewAlphaBlendApp test(application);
application.MainLoop();
return 0;
}