init - 初始化项目

samples/winrt_universal/PhoneTutorial/MainPage.xaml.cpp

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+//
+// MainPage.xaml.cpp
+// Implementation of the MainPage class.
+//
+
+#include "pch.h"
+#include "MainPage.xaml.h"
+
+#include <opencv2\imgproc\types_c.h>
+#include <opencv2\core.hpp>
+#include <opencv2\imgproc.hpp>
+#include <Robuffer.h>
+#include <ppl.h>
+#include <ppltasks.h>
+
+using namespace PhoneTutorial;
+using namespace Platform;
+using namespace Windows::Foundation;
+using namespace Windows::Foundation::Collections;
+using namespace Windows::UI::Xaml;
+using namespace Windows::UI::Xaml::Controls;
+using namespace Windows::UI::Xaml::Controls::Primitives;
+using namespace Windows::UI::Xaml::Data;
+using namespace Windows::UI::Xaml::Input;
+using namespace Windows::UI::Xaml::Media;
+using namespace Windows::UI::Xaml::Navigation;
+using namespace Windows::UI::Xaml::Media::Imaging;
+using namespace Windows::Storage::Streams;
+using namespace Microsoft::WRL;
+using namespace Windows::ApplicationModel;
+
+MainPage::MainPage()
+{
+    InitializeComponent();
+}
+
+/// <summary>
+/// Invoked when this page is about to be displayed in a Frame.
+/// </summary>
+/// <param name="e">Event data that describes how this page was reached.  The Parameter
+/// property is typically used to configure the page.</param>
+void MainPage::OnNavigatedTo(NavigationEventArgs^ e)
+{
+    (void) e;	// Unused parameter
+    LoadImage();
+}
+
+inline void ThrowIfFailed(HRESULT hr)
+{
+    if (FAILED(hr))
+    {
+        throw Exception::CreateException(hr);
+    }
+}
+
+byte* GetPointerToPixelData(IBuffer^ buffer)
+{
+    // Cast to Object^, then to its underlying IInspectable interface.
+    Object^ obj = buffer;
+    ComPtr<IInspectable> insp(reinterpret_cast<IInspectable*>(obj));
+
+    // Query the IBufferByteAccess interface.
+    ComPtr<IBufferByteAccess> bufferByteAccess;
+    ThrowIfFailed(insp.As(&bufferByteAccess));
+
+    // Retrieve the buffer data.
+    byte* pixels = nullptr;
+    ThrowIfFailed(bufferByteAccess->Buffer(&pixels));
+    return pixels;
+}
+
+void PhoneTutorial::MainPage::Process_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
+{
+    (void) e;	// Unused parameter
+
+    // get the pixels from the WriteableBitmap
+    byte* pPixels = GetPointerToPixelData(m_bitmap->PixelBuffer);
+    int height = m_bitmap->PixelHeight;
+    int width = m_bitmap->PixelWidth;
+
+    // create a matrix the size and type of the image
+    cv::Mat mat(width, height, CV_8UC4);
+    memcpy(mat.data, pPixels, 4 * height*width);
+
+    // convert to grayscale
+    cv::Mat intermediateMat;
+    cv::cvtColor(mat, intermediateMat, COLOR_RGB2GRAY);
+
+    // convert to BGRA
+    cv::cvtColor(intermediateMat, mat, COLOR_GRAY2BGRA);
+
+    // copy processed image back to the WriteableBitmap
+    memcpy(pPixels, mat.data, 4 * height*width);
+
+    // update the WriteableBitmap
+    m_bitmap->Invalidate();
+}
+
+void PhoneTutorial::MainPage::LoadImage()
+{
+    Concurrency::task<Windows::Storage::StorageFile^> getFileTask(Package::Current->InstalledLocation->GetFileAsync(L"Lena.png"));
+
+    auto getStreamTask = getFileTask.then(
+        [](Windows::Storage::StorageFile ^storageFile)
+    {
+        return storageFile->OpenReadAsync();
+    });
+
+    getStreamTask.then(
+        [this](Windows::Storage::Streams::IRandomAccessStreamWithContentType^ stream)
+    {
+        m_bitmap = ref new Windows::UI::Xaml::Media::Imaging::WriteableBitmap(1, 1);
+        m_bitmap->SetSource(stream);
+        image->Source = m_bitmap;
+    });
+}
+
+void PhoneTutorial::MainPage::Reset_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
+{
+    (void) e;	// Unused parameter
+    LoadImage();
+}