1 files changed, 85 insertions, 0 deletions
diff --git a/gfx/thebes/PrintTargetPDF.cpp b/gfx/thebes/PrintTargetPDF.cpp
new file mode 100644
index 000000000..ce536c07f
--- /dev/null
+++ b/gfx/thebes/PrintTargetPDF.cpp
@@ -0,0 +1,85 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * 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/. */
+
+#include "PrintTargetPDF.h"
+
+#include "cairo.h"
+#include "cairo-pdf.h"
+
+namespace mozilla {
+namespace gfx {
+
+static cairo_status_t
+write_func(void *closure, const unsigned char *data, unsigned int length)
+{
+  nsCOMPtr<nsIOutputStream> out = reinterpret_cast<nsIOutputStream*>(closure);
+  do {
+    uint32_t wrote = 0;
+    if (NS_FAILED(out->Write((const char*)data, length, &wrote))) {
+      break;
+    }
+    data += wrote; length -= wrote;
+  } while (length > 0);
+  NS_ASSERTION(length == 0, "not everything was written to the file");
+  return CAIRO_STATUS_SUCCESS;
+}
+
+PrintTargetPDF::PrintTargetPDF(cairo_surface_t* aCairoSurface,
+                               const IntSize& aSize,
+                               nsIOutputStream *aStream)
+  : PrintTarget(aCairoSurface, aSize)
+  , mStream(aStream)
+{
+}
+
+PrintTargetPDF::~PrintTargetPDF()
+{
+  // We get called first, then PrintTarget's dtor.  That means that mStream
+  // is destroyed before PrintTarget's dtor calls cairo_surface_destroy.  This
+  // can be a problem if Finish() hasn't been called on us, since
+  // cairo_surface_destroy will then call cairo_surface_finish and that will
+  // end up invoking write_func above with the by now dangling pointer mStream
+  // that mCairoSurface stored.  To prevent that from happening we must call
+  // Flush here before mStream is deleted.
+  Finish();
+}
+
+/* static */ already_AddRefed<PrintTargetPDF>
+PrintTargetPDF::CreateOrNull(nsIOutputStream *aStream,
+                             const IntSize& aSizeInPoints)
+{
+  cairo_surface_t* surface =
+    cairo_pdf_surface_create_for_stream(write_func, (void*)aStream,
+                                        aSizeInPoints.width,
+                                        aSizeInPoints.height);
+  if (cairo_surface_status(surface)) {
+    return nullptr;
+  }
+
+  // The new object takes ownership of our surface reference.
+  RefPtr<PrintTargetPDF> target = new PrintTargetPDF(surface, aSizeInPoints,
+                                                     aStream);
+  return target.forget();
+}
+
+nsresult
+PrintTargetPDF::EndPage()
+{
+  cairo_surface_show_page(mCairoSurface);
+  return NS_OK;
+}
+
+void
+PrintTargetPDF::Finish()
+{
+  if (mIsFinished) {
+    return; // We don't want to call Close() on mStream more than once
+  }
+  PrintTarget::Finish();
+  mStream->Close();
+}
+
+} // namespace gfx
+} // namespace mozilla