alpha-blending-cpu-example.cpp
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/*
* Copyright (c) 2017 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" );
}
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 stage
Stage stage = Stage::GetCurrent();
stage.KeyEventSignal().Connect(this, &ImageViewAlphaBlendApp::OnKeyEvent);
stage.SetBackgroundColor( Color::WHITE );
mImageView = Toolkit::ImageView::New();
mImageView.SetSize(200, 200);
mImageView.SetParentOrigin( ParentOrigin::CENTER );
stage.Add(mImageView);
mImageLabel = Toolkit::TextLabel::New();
mImageLabel.SetParentOrigin( ParentOrigin::BOTTOM_CENTER );
mImageLabel.SetAnchorPoint( ParentOrigin::BOTTOM_CENTER );
mImageLabel.SetPosition( Vector3( 0.0f, -50.0f, 0.0f ) );
mImageLabel.SetProperty( Toolkit::TextLabel::Property::TEXT_COLOR, Color::BLACK );
stage.Add(mImageLabel);
mMaskLabel = Toolkit::TextLabel::New();
mMaskLabel.SetParentOrigin( ParentOrigin::BOTTOM_CENTER );
mMaskLabel.SetAnchorPoint( ParentOrigin::BOTTOM_CENTER );
mMaskLabel.SetPosition( Vector3( 0.0f, 0.0f, 0.0f ) );
mMaskLabel.SetProperty( Toolkit::TextLabel::Property::TEXT_COLOR, Color::BLACK );
stage.Add(mMaskLabel);
LoadImages();
stage.TouchSignal().Connect( this, &ImageViewAlphaBlendApp::OnTouched );
}
void OnTouched( const TouchData& touchData )
{
static bool touched = false;
if( touchData.GetState( 0 ) == PointState::DOWN )
{
touched = true;
}
if( touchData.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.state == 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;
};
void RunTest( Application& application )
{
ImageViewAlphaBlendApp test( application );
application.MainLoop();
}
// Entry point for Linux & Tizen applications
//
int DALI_EXPORT_API main( int argc, char **argv )
{
Application application = Application::New( &argc, &argv );
RunTest( application );
return 0;
}