alpha-blending-cpu-example.cpp
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/*
* Copyright (c) 2020 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 <cstring>
using namespace Dali;
namespace
{
const char* const IMAGE_PATH_1(DEMO_IMAGE_DIR "people-small-7b.jpg"); // 100x100
const char* const IMAGE_PATH_2(DEMO_IMAGE_DIR "people-medium-7.jpg");
const char* const IMAGE_PATH_3(DEMO_IMAGE_DIR "people-medium-7-rgb565.png"); // is compressed
const char* const IMAGE_PATH_4(DEMO_IMAGE_DIR "people-medium-7-masked.png"); // has alpha channel
const char* const MASK_IMAGE_PATH_1(DEMO_IMAGE_DIR "store_mask_profile_n.png"); // 300x300
const char* const MASK_IMAGE_PATH_2(DEMO_IMAGE_DIR "store_mask_profile_f.png");
} // namespace
class ImageViewAlphaBlendApp : public ConnectionTracker
{
public:
ImageViewAlphaBlendApp(Application& application)
: mApplication(application),
mImageCombinationIndex(0)
{
// 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)
{
// This creates an image view with one of 3 images, and one of 2 masks.
// Clicking the screen will cycle through each combination of mask and image.
// Get a handle to the window
Window window = application.GetWindow();
window.KeyEventSignal().Connect(this, &ImageViewAlphaBlendApp::OnKeyEvent);
window.SetBackgroundColor(Color::WHITE);
mImageView = Toolkit::ImageView::New();
mImageView.SetProperty(Actor::Property::SIZE, Vector2(200, 200));
mImageView.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
window.Add(mImageView);
mImageLabel = Toolkit::TextLabel::New();
mImageLabel.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::BOTTOM_CENTER);
mImageLabel.SetProperty(Actor::Property::ANCHOR_POINT, ParentOrigin::BOTTOM_CENTER);
mImageLabel.SetProperty(Actor::Property::POSITION, Vector3(0.0f, -50.0f, 0.0f));
mImageLabel.SetProperty(Toolkit::TextLabel::Property::TEXT_COLOR, Color::BLACK);
window.Add(mImageLabel);
mMaskLabel = Toolkit::TextLabel::New();
mMaskLabel.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::BOTTOM_CENTER);
mMaskLabel.SetProperty(Actor::Property::ANCHOR_POINT, ParentOrigin::BOTTOM_CENTER);
mMaskLabel.SetProperty(Actor::Property::POSITION, Vector3(0.0f, 0.0f, 0.0f));
mMaskLabel.SetProperty(Toolkit::TextLabel::Property::TEXT_COLOR, Color::BLACK);
window.Add(mMaskLabel);
LoadImages();
window.TouchedSignal().Connect(this, &ImageViewAlphaBlendApp::OnTouched);
}
void OnTouched(const TouchEvent& touch)
{
static bool touched = false;
if(touch.GetState(0) == PointState::DOWN)
{
touched = true;
}
if(touch.GetState(0) == PointState::UP && touched)
{
mImageCombinationIndex++;
touched = false;
LoadImages();
}
}
void LoadImages()
{
const char* images[4] = {IMAGE_PATH_1, IMAGE_PATH_2, IMAGE_PATH_3, IMAGE_PATH_4};
const char* masks[2] = {MASK_IMAGE_PATH_1, MASK_IMAGE_PATH_2};
const char* mask = masks[mImageCombinationIndex % 2]; // Cycle through masks
const char* image = images[(mImageCombinationIndex / 2) % 4]; // then images
Property::Map map;
map.Add(Toolkit::Visual::Property::TYPE, Toolkit::Visual::Type::IMAGE);
map.Add(Toolkit::ImageVisual::Property::URL, image);
map.Add(Toolkit::ImageVisual::Property::ALPHA_MASK_URL, mask);
if(mImageCombinationIndex % 2 == 0)
{
map.Add(Toolkit::ImageVisual::Property::MASK_CONTENT_SCALE, 1.f);
map.Add(Toolkit::ImageVisual::Property::CROP_TO_MASK, false);
}
else
{
map.Add(Toolkit::ImageVisual::Property::MASK_CONTENT_SCALE, 1.6f);
map.Add(Toolkit::ImageVisual::Property::CROP_TO_MASK, true);
}
mImageView.SetProperty(Toolkit::ImageView::Property::IMAGE, map);
mImageLabel.SetProperty(Toolkit::TextLabel::Property::TEXT, strrchr(image, '/'));
mMaskLabel.SetProperty(Toolkit::TextLabel::Property::TEXT, strrchr(mask, '/'));
}
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();
}
}
}
private:
Application& mApplication;
Toolkit::ImageView mImageView;
Toolkit::TextLabel mImageLabel;
Toolkit::TextLabel mMaskLabel;
int mImageCombinationIndex;
};
int DALI_EXPORT_API main(int argc, char** argv)
{
Application application = Application::New(&argc, &argv);
ImageViewAlphaBlendApp test(application);
application.MainLoop();
return 0;
}