DirectX printing added

After much research it was determined that use of the DirectX 2D methods is the proper way
to add printing support to a Windows 8 application.   This enables the pages to be rendered
as they are requested by the print thread.   This occurs for both the print preview screen
as well as the print to the output device.

1 files changed, 57 insertions, 0 deletions

diff --git a/platform/winrt/mupdf_cpp/PrintPage.h b/platform/winrt/mupdf_cpp/PrintPage.h
new file mode 100644
index 00000000..725a5a43
--- /dev/null
+++ b/platform/winrt/mupdf_cpp/PrintPage.h
@@ -0,0 +1,57 @@
+#pragma once
+#include <windows.graphics.printing.h>
+#include <printpreview.h>
+#include <documentsource.h>
+#include "MainPage.xaml.h"
+
+using namespace Microsoft::WRL;
+using namespace mupdf_cpp;
+
+/* This is the interface to the print thread calls */
+class PrintPages : public Microsoft::WRL::RuntimeClass<Microsoft::WRL::RuntimeClassFlags<Microsoft::WRL::WinRtClassicComMix>,
+															ABI::Windows::Graphics::Printing::IPrintDocumentSource,
+															IPrintDocumentPageSource,
+															IPrintPreviewPageCollection>
+{
+private:
+	InspectableClass(L"Windows.Graphics.Printing.IPrintDocumentSource", BaseTrust);
+
+public:
+	HRESULT RuntimeClassInitialize(IUnknown* pageRenderer)
+	{
+		HRESULT hr = (pageRenderer != nullptr) ? S_OK : E_INVALIDARG;
+
+		if (SUCCEEDED(hr))
+		{
+			m_paginate_called = false;
+			m_totalpages = 1;
+			m_height = 0.f;
+			m_width = 0.f;
+			m_renderer = reinterpret_cast<MainPage^>(pageRenderer);
+		}
+		return hr;
+	}
+	IFACEMETHODIMP GetPreviewPageCollection(IPrintDocumentPackageTarget*  doc_target,
+											IPrintPreviewPageCollection** doc_collection);
+	IFACEMETHODIMP MakeDocument(IInspectable* doc_options, 
+								IPrintDocumentPackageTarget* doc_target);
+	IFACEMETHODIMP Paginate(uint32 current_jobpage, IInspectable* doc_options);
+	IFACEMETHODIMP MakePage(uint32 desired_jobpage, float  width, float  height);
+	void ResetPreview();
+
+private:
+	float TransformedPageSize(float desired_width, float desired_height, 
+								Windows::Foundation::Size* preview_size);
+	uint32 m_totalpages;
+	bool m_paginate_called;
+	float m_height;
+	float m_width;
+	D2D1_RECT_F m_imageable_rect;
+	MainPage^ m_renderer;
+
+	Microsoft::WRL::ComPtr<IPrintPreviewDxgiPackageTarget> m_dxgi_previewtarget;
+
+	void DrawPreviewSurface(float width, float height, float scale_in, 
+								  D2D1_RECT_F contentBox, uint32 page_num, 
+								  IPrintPreviewDxgiPackageTarget* previewTarget);
+};