Integrate the Windows 8 code into the Chromium tree.

win8/metro_driver/print_document_source.h

Index: win8/metro_driver/print_document_source.h
diff --git a/win8/metro_driver/print_document_source.h b/win8/metro_driver/print_document_source.h
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_METRO_DRIVER_PRINT_DOCUMENT_SOURCE_H_
+#define CHROME_BROWSER_UI_METRO_DRIVER_PRINT_DOCUMENT_SOURCE_H_
+
+#include <documentsource.h>
+#include <printpreview.h>
+#include <windows.graphics.printing.h>
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/synchronization/condition_variable.h"
+#include "base/synchronization/waitable_event.h"
+#include "win8/metro_driver/winrt_utils.h"
+
+// Hack to be removed once we don't need to build with an SDK earlier than
+// 8441 where the name of the interface has been changed.
+// TODO(mad): remove once we don't run mixed SDK/OS anymore.
+#ifndef __IPrintPreviewDxgiPackageTarget_FWD_DEFINED__
+typedef IPrintPreviewDXGIPackageTarget IPrintPreviewDxgiPackageTarget;
+#endif
+
+
+namespace base {
+class Lock;
+};  // namespace base
+
+namespace metro_driver {
+
+// This class is given to Metro as a source for print documents.
+// The methodless IPrintDocumentSource interface is used to identify it as such.
+// Then, the other interfaces are used to generate preview and print documents.
+// It also exposes a few methods for the print handler to control the document.
+class PrintDocumentSource
+    : public mswr::RuntimeClass<
+          mswr::RuntimeClassFlags<mswr::WinRtClassicComMix>,
+          wingfx::Printing::IPrintDocumentSource,
+          IPrintDocumentPageSource,
+          IPrintPreviewPageCollection> {
+ public:
+  // A set of interfaces for the DirectX context that our parent owns
+  // and that don't need to change from document to document.
+  struct DirectXContext {
+    DirectXContext() {}
+    DirectXContext(ID3D11Device1* device_3d,
+                   ID2D1Factory1* factory_2d,
+                   ID2D1Device* device_2d,
+                   ID2D1DeviceContext* context_2d,
+                   IWICImagingFactory2* factory_wic)
+        : d3d_device(device_3d),
+          d2d_factory(factory_2d),
+          d2d_device(device_2d),
+          d2d_context(context_2d),
+          wic_factory(factory_wic) {
+    }
+    DirectXContext(const DirectXContext& other)
+        : d3d_device(other.d3d_device),
+          d2d_factory(other.d2d_factory),
+          d2d_device(other.d2d_device),
+          d2d_context(other.d2d_context),
+          wic_factory(other.wic_factory) {
+    }
+    mswr::ComPtr<ID3D11Device1> d3d_device;
+    mswr::ComPtr<ID2D1Factory1> d2d_factory;
+    mswr::ComPtr<ID2D1Device> d2d_device;
+    mswr::ComPtr<ID2D1DeviceContext> d2d_context;
+    mswr::ComPtr<IWICImagingFactory2> wic_factory;
+  };
+
+  // Construction / Initialization.
+  explicit PrintDocumentSource();
+  HRESULT RuntimeClassInitialize(const DirectXContext& directx_context,
+                                 base::Lock* parent_lock);
+  // Aborts any pending asynchronous operation.
+  void Abort();
+
+  // classic COM interface IPrintDocumentPageSource methods
+  STDMETHOD(GetPreviewPageCollection) (
+      IPrintDocumentPackageTarget* package_target,
+      IPrintPreviewPageCollection** page_collection);
+  STDMETHOD(MakeDocument)(IInspectable* options,
+                          IPrintDocumentPackageTarget* package_target);
+
+  // classic COM interface IPrintPreviewPageCollection methods
+  STDMETHOD(Paginate)(uint32 page, IInspectable* options);
+  STDMETHOD(MakePage)(uint32 desired_page, float width, float height);
+
+  // If the screen DPI changes, we must be warned here.
+  void ResetDpi(float dpi);
+
+  // When the page count is known, this is called and we can setup our data.
+  void SetPageCount(size_t page_count);
+
+  // Every time a page is ready, this is called and we can read the data if
+  // we were waiting for it, or store it for later use.
+  void AddPage(size_t page_number, IStream* metafile_stream);
+
+ private:
+  // Print the page given in the metafile stream to the given print control.
+  HRESULT PrintPage(ID2D1PrintControl* print_control,
+                    ID2D1GdiMetafile* metafile_stream,
+                    D2D1_SIZE_F pageSize);
+
+  // Helper function to wait for the page count to be ready.
+  // Returns 0 when aborted.
+  size_t WaitAndGetPageCount();
+
+  // Helper function to wait for a given page to be ready.
+  // Returns S_FALSE when aborted.
+  HRESULT WaitAndGetPage(size_t page_number,
+                         ID2D1GdiMetafile** metafile_stream);
+
+  DirectXContext directx_context_;
+
+  // Once page data is available, it's added to this vector.
+  std::vector<mswr::ComPtr<IStream>> pages_;
+
+  // When page count is set, the size of this vector is set to that number.
+  // Then, every time page data is added to pages_, the associated condition
+  // variable in this vector is signaled. This is only filled when we receive
+  // the page count, so we must wait on page_count_ready_ before accessing
+  // the content of this vector.
+  std::vector<scoped_ptr<base::ConditionVariable> > pages_ready_state_;
+
+  // This event is signaled when we receive a page count from Chrome. We should
+  // not receive any page data before the count, so we can check this event
+  // while waiting for pages too, in case we ask for page data before we got
+  // the count, so before we properly initialized pages_ready_state_.
+  base::WaitableEvent page_count_ready_;
+
+  // The preview target interface set from within GetPreviewPageCollection
+  // but used from within MakePage.
+  mswr::ComPtr<IPrintPreviewDxgiPackageTarget> dxgi_preview_target_;
+
+  // Our parent's lock (to make sure it is initialized and destroyed early
+  // enough), which we use to protect access to our data members.
+  base::Lock* parent_lock_;
+
+  // The width/height requested in Paginate and used in MakePage.
+  // TODO(mad): Height is currently not used, and width is only used for
+  // scaling. We need to add a way to specify width and height when we request
+  // pages from Chrome.
+  float height_;
+  float width_;
+
+  // The DPI is set by Windows and we need to give it to DirectX.
+  float dpi_;
+
+  // A flag identiying that we have been aborted. Needed to properly handle
+  // asynchronous callbacks.
+  bool aborted_;
+
+  // TODO(mad): remove once we don't run mixed SDK/OS anymore.
+  bool using_old_preview_interface_;
+};
+
+}  // namespace metro_driver
+
+#endif  // CHROME_BROWSER_UI_METRO_DRIVER_PRINT_DOCUMENT_SOURCE_H_