1 files changed, 174 insertions, 0 deletions
diff --git a/gfx/thebes/PrintTarget.h b/gfx/thebes/PrintTarget.h
new file mode 100644
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+++ b/gfx/thebes/PrintTarget.h
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZILLA_GFX_PRINTTARGET_H
+#define MOZILLA_GFX_PRINTTARGET_H
+
+#include <functional>
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/gfx/2D.h"
+#include "nsISupportsImpl.h"
+#include "nsStringFwd.h"
+
+namespace mozilla {
+namespace gfx {
+
+class DrawEventRecorder;
+
+/**
+ * A class that is used to draw output that is to be sent to a printer or print
+ * preview.
+ *
+ * This class wraps a cairo_surface_t* and provides access to it via a
+ * DrawTarget.  The various checkpointing methods manage the state of the
+ * platform specific cairo_surface_t*.
+ */
+class PrintTarget {
+ public:
+  typedef std::function<void(nsresult)> PageDoneCallback;
+
+  NS_INLINE_DECL_REFCOUNTING(PrintTarget);
+
+  /// Must be matched 1:1 by an EndPrinting/AbortPrinting call.
+  virtual nsresult BeginPrinting(const nsAString& aTitle,
+                                 const nsAString& aPrintToFileName,
+                                 int32_t aStartPage, int32_t aEndPage) {
+    return NS_OK;
+  }
+  virtual nsresult EndPrinting() { return NS_OK; }
+  virtual nsresult AbortPrinting() {
+#ifdef DEBUG
+    mHasActivePage = false;
+#endif
+    return NS_OK;
+  }
+  virtual nsresult BeginPage() {
+#ifdef DEBUG
+    MOZ_ASSERT(!mHasActivePage, "Missing EndPage() call");
+    mHasActivePage = true;
+#endif
+    return NS_OK;
+  }
+  virtual nsresult EndPage() {
+#ifdef DEBUG
+    mHasActivePage = false;
+#endif
+    return NS_OK;
+  }
+
+  /**
+   * Releases the resources used by this PrintTarget.  Typically this should be
+   * called after calling EndPrinting().  Calling this more than once is
+   * allowed, but subsequent calls are a no-op.
+   *
+   * Note that any DrawTarget obtained from this PrintTarget will no longer be
+   * useful after this method has been called.
+   */
+  virtual void Finish();
+
+  /**
+   * Returns true if to print landscape our consumers must apply a 90 degrees
+   * rotation to our DrawTarget.
+   */
+  virtual bool RotateNeededForLandscape() const { return false; }
+
+  const IntSize& GetSize() const { return mSize; }
+
+  /**
+   * Makes a DrawTarget to draw the printer output to, or returns null on
+   * failure.
+   *
+   * If aRecorder is passed a recording DrawTarget will be created instead of
+   * the type of DrawTarget that would normally be returned for a particular
+   * subclass of this class.  This argument is only intended to be used in
+   * the e10s content process if printing output can't otherwise be transfered
+   * over to the parent process using the normal DrawTarget type.
+   *
+   * NOTE: this should only be called between BeginPage()/EndPage() calls, and
+   * the returned DrawTarget should not be drawn to after EndPage() has been
+   * called.
+   *
+   * XXX For consistency with the old code this takes a size parameter even
+   * though we already have the size passed to our subclass's CreateOrNull
+   * factory methods.  The size passed to the factory method comes from
+   * nsIDeviceContextSpec::MakePrintTarget overrides, whereas the size
+   * passed to us comes from nsDeviceContext::CreateRenderingContext.  In at
+   * least one case (nsDeviceContextSpecAndroid::MakePrintTarget) these are
+   * different.  At some point we should align the two sources and get rid of
+   * this method's size parameter.
+   *
+   * XXX For consistency with the old code this returns a new DrawTarget for
+   * each call.  Perhaps we can create and cache a DrawTarget in our subclass's
+   * CreateOrNull factory methods and return that on each call?  Currently that
+   * seems to cause Mochitest failures on Windows though, which coincidentally
+   * is the only platform where we get passed an aRecorder.  Probably the
+   * issue is that we get called more than once with a different aRecorder, so
+   * storing one recording DrawTarget for our lifetime doesn't currently work.
+   *
+   * XXX Could we pass aRecorder to our subclass's CreateOrNull factory methods?
+   * We'd need to check that our consumers always pass the same aRecorder for
+   * our entire lifetime.
+   *
+   * XXX Once PrintTargetThebes is removed this can become non-virtual.
+   *
+   * XXX In the long run, this class and its sub-classes should be converted to
+   * use STL classes and mozilla::RefCounted<> so the can be moved to Moz2D.
+   *
+   * TODO: Consider adding a SetDPI method that calls
+   * cairo_surface_set_fallback_resolution.
+   */
+  virtual already_AddRefed<DrawTarget> MakeDrawTarget(
+      const IntSize& aSize, DrawEventRecorder* aRecorder = nullptr);
+
+  /**
+   * Returns a reference DrawTarget. Unlike MakeDrawTarget, this method is not
+   * restricted to being called between BeginPage()/EndPage() calls, and the
+   * returned DrawTarget is still valid to use after EndPage() has been called.
+   */
+  virtual already_AddRefed<DrawTarget> GetReferenceDrawTarget();
+
+  /**
+   * If IsSyncPagePrinting returns true, then a user can assume the content of
+   * a page was already printed after EndPage().
+   * If IsSyncPagePrinting returns false, then a user should register a
+   * callback function using RegisterPageDoneCallback to receive page print
+   * done notifications.
+   */
+  virtual bool IsSyncPagePrinting() const { return true; }
+  void RegisterPageDoneCallback(PageDoneCallback&& aCallback);
+  void UnregisterPageDoneCallback();
+
+  static void AdjustPrintJobNameForIPP(const nsAString& aJobName,
+                                       nsCString& aAdjustedJobName);
+  static void AdjustPrintJobNameForIPP(const nsAString& aJobName,
+                                       nsString& aAdjustedJobName);
+
+ protected:
+  // Only created via subclass's constructors
+  explicit PrintTarget(cairo_surface_t* aCairoSurface, const IntSize& aSize);
+
+  // Protected because we're refcounted
+  virtual ~PrintTarget();
+
+  static already_AddRefed<DrawTarget> CreateRecordingDrawTarget(
+      DrawEventRecorder* aRecorder, DrawTarget* aDrawTarget);
+
+  cairo_surface_t* mCairoSurface;
+  RefPtr<DrawTarget> mRefDT;  // reference DT
+
+  IntSize mSize;
+  bool mIsFinished;
+#ifdef DEBUG
+  bool mHasActivePage;
+#endif
+
+  PageDoneCallback mPageDoneCallback;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif /* MOZILLA_GFX_PRINTTARGET_H */