// Video support for Windows Runtime
// Copyright (c) Microsoft Open Technologies, Inc.
// All rights reserved.
//
// (3 - clause BSD License)
//
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// the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
// following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
// following disclaimer in the documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or
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//
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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#include <ppl.h>
#include <functional>
#include <concrt.h>
#include <agile.h>
using namespace Windows::UI::Xaml::Controls;
namespace cv
{
//! @addtogroup videoio_winrt
//! @{
enum {
OPEN_CAMERA = 300,
CLOSE_CAMERA,
UPDATE_IMAGE_ELEMENT,
SHOW_TRACKBAR
};
/********************************** WinRT API ************************************************/
template <typename ...Args>
CV_EXPORTS void winrt_startMessageLoop(std::function<void(Args...)>&& callback, Args... args);
template <typename ...Args>
CV_EXPORTS void winrt_startMessageLoop(void callback(Args...), Args... args);
/** @brief
@note
Starts (1) frame-grabbing loop and (2) message loop
1. Function passed as an argument must implement common OCV reading frames
pattern (see cv::VideoCapture documentation) AND call cv::winrt_imgshow().
2. Message processing loop required to overcome WinRT container and type
conversion restrictions. OCV provides default implementation
Here is how the class can be used:
@code
void cvMain()
{
Mat frame;
VideoCapture cam;
cam.open(0);
while (1)
{
cam >> frame;
// don't reprocess the same frame again
if (!cam.grab()) continue;
// your processing logic goes here
// obligatory step to get XAML image component updated
winrt_imshow();
}
}
MainPage::MainPage()
{
InitializeComponent();
cv::winrt_setFrameContainer(cvImage);
cv::winrt_startMessageLoop(cvMain);
}
@endcode
*/
template
CV_EXPORTS void winrt_startMessageLoop(void callback(void));
/** @brief
@note
Must be called from WinRT specific callback to handle image grabber state.
Here is how the class can be used:
@code
MainPage::MainPage()
{
// ...
Window::Current->VisibilityChanged += ref new Windows::UI::Xaml::WindowVisibilityChangedEventHandler(this, &Application::MainPage::OnVisibilityChanged);
// ...
}
void Application::MainPage::OnVisibilityChanged(Platform::Object ^sender,
Windows::UI::Core::VisibilityChangedEventArgs ^e)
{
cv::winrt_onVisibilityChanged(e->Visible);
}
@endcode
*/
CV_EXPORTS void winrt_onVisibilityChanged(bool visible);
/** @brief
@note
Must be called to assign WinRT control holding image you're working with.
Code sample is available for winrt_startMessageLoop().
*/
CV_EXPORTS void winrt_setFrameContainer(::Windows::UI::Xaml::Controls::Image^ image);
/** @brief
@note
Must be called to update attached image source.
Code sample is available for winrt_startMessageLoop().
*/
CV_EXPORTS void winrt_imshow();
//! @} videoio_winrt